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guile/module/sxml/upstream/SSAX.scm
Andy Wingo bb0615d015 ssax: treat *DEFAULT* as a fallback handler in entity alist 
* module/sxml/upstream/SSAX.scm (ssax:handle-parsed-entity):
  Interpret *DEFAULT* as being a default handler procedure for parsed
  entities.  Includes test.
2013-01-28 10:52:47 +01:00

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; Functional XML parsing framework: SAX/DOM and SXML parsers
; with support for XML Namespaces and validation
;
; This is a package of low-to-high level lexing and parsing procedures
; that can be combined to yield a SAX, a DOM, a validating parsers, or
; a parser intended for a particular document type. The procedures in
; the package can be used separately to tokenize or parse various
; pieces of XML documents. The package supports XML Namespaces,
; internal and external parsed entities, user-controlled handling of
; whitespace, and validation. This module therefore is intended to be
; a framework, a set of "Lego blocks" you can use to build a parser
; following any discipline and performing validation to any degree. As
; an example of the parser construction, this file includes a
; semi-validating SXML parser.
; The present XML framework has a "sequential" feel of SAX yet a
; "functional style" of DOM. Like a SAX parser, the framework scans
; the document only once and permits incremental processing. An
; application that handles document elements in order can run as
; efficiently as possible. _Unlike_ a SAX parser, the framework does
; not require an application register stateful callbacks and surrender
; control to the parser. Rather, it is the application that can drive
; the framework -- calling its functions to get the current lexical or
; syntax element. These functions do not maintain or mutate any state
; save the input port. Therefore, the framework permits parsing of XML
; in a pure functional style, with the input port being a monad (or a
; linear, read-once parameter).
; Besides the PORT, there is another monad -- SEED. Most of the
; middle- and high-level parsers are single-threaded through the
; seed. The functions of this framework do not process or affect the
; SEED in any way: they simply pass it around as an instance of an
; opaque datatype. User functions, on the other hand, can use the
; seed to maintain user's state, to accumulate parsing results, etc. A
; user can freely mix his own functions with those of the
; framework. On the other hand, the user may wish to instantiate a
; high-level parser: ssax:make-elem-parser or ssax:make-parser. In
; the latter case, the user must provide functions of specific
; signatures, which are called at predictable moments during the
; parsing: to handle character data, element data, or processing
; instructions (PI). The functions are always given the SEED, among
; other parameters, and must return the new SEED.
; From a functional point of view, XML parsing is a combined
; pre-post-order traversal of a "tree" that is the XML document
; itself. This down-and-up traversal tells the user about an element
; when its start tag is encountered. The user is notified about the
; element once more, after all element's children have been
; handled. The process of XML parsing therefore is a fold over the
; raw XML document. Unlike a fold over trees defined in [1], the
; parser is necessarily single-threaded -- obviously as elements
; in a text XML document are laid down sequentially. The parser
; therefore is a tree fold that has been transformed to accept an
; accumulating parameter [1,2].
; Formally, the denotational semantics of the parser can be expressed
; as
; parser:: (Start-tag -> Seed -> Seed) ->
; (Start-tag -> Seed -> Seed -> Seed) ->
; (Char-Data -> Seed -> Seed) ->
; XML-text-fragment -> Seed -> Seed
; parser fdown fup fchar "<elem attrs> content </elem>" seed
; = fup "<elem attrs>" seed
; (parser fdown fup fchar "content" (fdown "<elem attrs>" seed))
;
; parser fdown fup fchar "char-data content" seed
; = parser fdown fup fchar "content" (fchar "char-data" seed)
;
; parser fdown fup fchar "elem-content content" seed
; = parser fdown fup fchar "content" (
; parser fdown fup fchar "elem-content" seed)
; Compare the last two equations with the left fold
; fold-left kons elem:list seed = fold-left kons list (kons elem seed)
; The real parser created my ssax:make-parser is slightly more complicated,
; to account for processing instructions, entity references, namespaces,
; processing of document type declaration, etc.
; The XML standard document referred to in this module is
; http://www.w3.org/TR/1998/REC-xml-19980210.html
;
; The present file also defines a procedure that parses the text of an
; XML document or of a separate element into SXML, an
; S-expression-based model of an XML Information Set. SXML is also an
; Abstract Syntax Tree of an XML document. SXML is similar
; but not identical to DOM; SXML is particularly suitable for
; Scheme-based XML/HTML authoring, SXPath queries, and tree
; transformations. See SXML.html for more details.
; SXML is a term implementation of evaluation of the XML document [3].
; The other implementation is context-passing.
; The present frameworks fully supports the XML Namespaces Recommendation:
; http://www.w3.org/TR/REC-xml-names/
; Other links:
; [1] Jeremy Gibbons, Geraint Jones, "The Under-appreciated Unfold,"
; Proc. ICFP'98, 1998, pp. 273-279.
; [2] Richard S. Bird, The promotion and accumulation strategies in
; transformational programming, ACM Trans. Progr. Lang. Systems,
; 6(4):487-504, October 1984.
; [3] Ralf Hinze, "Deriving Backtracking Monad Transformers,"
; Functional Pearl. Proc ICFP'00, pp. 186-197.
; IMPORT
; parser-error ssax:warn, see Handling of errors, below
; functions declared in files util.scm, input-parse.scm and look-for-str.scm
; char-encoding.scm for various platform-specific character-encoding functions.
; From SRFI-13: string-concatenate/shared and string-concatenate-reverse/shared
; If a particular implementation lacks SRFI-13 support, please
; include the file srfi-13-local.scm
; Handling of errors
; This package relies on a function parser-error, which must be defined
; by a user of the package. The function has the following signature:
; parser-error PORT MESSAGE SPECIALISING-MSG*
; Many procedures of this package call 'parser-error' whenever a
; parsing, well-formedness or validation error is encountered. The
; first argument is a port, which typically points to the offending
; character or its neighborhood. Most of the Scheme systems let the
; user query a PORT for the current position. The MESSAGE argument
; indicates a failed XML production or a failed XML constraint. The
; latter is referred to by its anchor name in the XML Recommendation
; or XML Namespaces Recommendation. The parsing library (e.g.,
; next-token, assert-curr-char) invoke 'parser-error' as well, in
; exactly the same way. See input-parse.scm for more details.
; See
; http://pair.com/lisovsky/download/parse-error.scm
; for an excellent example of such a redefined parser-error function.
;
; In addition, the present code invokes a function ssax:warn
; ssax:warn PORT MESSAGE SPECIALISING-MSG*
; to notify the user about warnings that are NOT errors but still
; may alert the user.
;
; Again, parser-error and ssax:warn are supposed to be defined by the
; user. However, if a run-test macro below is set to include
; self-tests, this present code does provide the definitions for these
; functions to allow tests to run.
; Misc notes
; It seems it is highly desirable to separate tests out in a dedicated
; file.
;
; Jim Bender wrote on Mon, 9 Sep 2002 20:03:42 EDT on the SSAX-SXML
; mailing list (message A fine-grained "lego")
; The task was to record precise source location information, as PLT
; does with its current XML parser. That parser records the start and
; end location (filepos, line#, column#) for pi, elements, attributes,
; chuncks of "pcdata".
; As suggested above, though, in some cases I needed to be able force
; open an interface that did not yet exist. For instance, I added an
; "end-char-data-hook", which would be called at the end of char-data
; fragment. This returns a function of type (seed -> seed) which is
; invoked on the current seed only if read-char-data has indeed reached
; the end of a block of char data (after reading a new token.
; But the deepest interface that I needed to expose was that of reading
; attributes. In the official distribution, this is not even a separate
; function. Instead, it is embedded within SSAX:read-attributes. This
; required some small re-structuring as well.
; This definitely will not be to everyone's taste (nor needed by most).
; Certainly, the existing make-parser interface addresses most custom
; needs. And likely 80-90 lines of a "link specification" to create a
; parser from many tiny little lego blocks may please only a few, while
; appalling others.
; The code is available at http://celtic.benderweb.net/ssax-lego.plt or
; http://celtic.benderweb.net/ssax-lego.tar.gz
; In the examples directory, I provide:
; - a unit version of the make-parser interface,
; - a simple SXML parser using that interface,
; - an SXML parser which directly uses the "new lego",
; - a pseudo-SXML parser, which records source location information
; - and lastly a parser which returns the structures used in PLT's xml
; collection, with source location information
; $Id: SSAX.scm,v 5.1 2004/07/07 16:02:30 sperber Exp $
;^^^^^^^^^
; See the Makefile in the ../tests directory
; (in particular, the rule vSSAX) for an example of how
; to run this code on various Scheme systems.
; See SSAX examples for many samples of using this code,
; again, on a variety of Scheme systems.
; See http://ssax.sf.net/
; The following macro runs built-in test cases -- or does not run,
; depending on which of the two cases below you commented out
; Case 1: no tests:
;(define-macro run-test (lambda body '(begin #f)))
;(define-syntax run-test (syntax-rules () ((run-test . args) (begin #f))))
; Case 2: with tests.
; The following macro could've been defined just as
; (define-macro run-test (lambda body `(begin (display "\n-->Test\n") ,@body)))
;
; Instead, it's more involved, to make up for case-insensitivity of
; symbols on some Scheme systems. In Gambit, symbols are case
; sensitive: (eq? 'A 'a) is #f and (eq? 'Aa (string->symbol "Aa")) is
; #t. On some systems, symbols are case-insensitive and just the
; opposite is true. Therefore, we introduce a notation '"ASymbol" (a
; quoted string) that stands for a case-_sensitive_ ASymbol -- on any
; R5RS Scheme system. This notation is valid only within the body of
; run-test.
; The notation is implemented by scanning the run-test's
; body and replacing every occurrence of (quote "str") with the result
; of (string->symbol "str"). We can do such a replacement at macro-expand
; time (rather than at run time).
; Here's the previous version of run-test, implemented as a low-level
; macro.
; (define-macro run-test
; (lambda body
; (define (re-write body)
; (cond
; ((vector? body)
; (list->vector (re-write (vector->list body))))
; ((not (pair? body)) body)
; ((and (eq? 'quote (car body)) (pair? (cdr body))
; (string? (cadr body)))
; (string->symbol (cadr body)))
; (else (cons (re-write (car body)) (re-write (cdr body))))))
; (cons 'begin (re-write body))))
;
; For portability, it is re-written as syntax-rules. The syntax-rules
; version is less powerful: for example, it can't handle
; (case x (('"Foo") (do-on-Foo))) whereas the low-level macro
; could correctly place a case-sensitive symbol at the right place.
; We also do not scan vectors (because we don't use them here).
; Twice-deep quasiquotes aren't handled either.
; Still, the syntax-rules version satisfies our immediate needs.
; Incidentally, I originally didn't believe that the macro below
; was at all possible.
;
; The macro is written in a continuation-passing style. A continuation
; typically has the following structure: (k-head ! . args)
; When the continuation is invoked, we expand into
; (k-head <computed-result> . arg). That is, the dedicated symbol !
; is the placeholder for the result.
;
; It seems that the most modular way to write the run-test macro would
; be the following
;
; (define-syntax run-test
; (syntax-rules ()
; ((run-test . ?body)
; (letrec-syntax
; ((scan-exp ; (scan-exp body k)
; (syntax-rules (quote quasiquote !)
; ((scan-exp (quote (hd . tl)) k)
; (scan-lit-lst (hd . tl) (do-wrap ! quasiquote k)))
; ((scan-exp (quote x) (k-head ! . args))
; (k-head
; (if (string? (quote x)) (string->symbol (quote x)) (quote x))
; . args))
; ((scan-exp (hd . tl) k)
; (scan-exp hd (do-tl ! scan-exp tl k)))
; ((scan-exp x (k-head ! . args))
; (k-head x . args))))
; (do-tl
; (syntax-rules (!)
; ((do-tl processed-hd fn () (k-head ! . args))
; (k-head (processed-hd) . args))
; ((do-tl processed-hd fn old-tl k)
; (fn old-tl (do-cons ! processed-hd k)))))
; ...
; (do-finish
; (syntax-rules ()
; ((do-finish (new-body)) new-body)
; ((do-finish new-body) (begin . new-body))))
; ...
; (scan-exp ?body (do-finish !))
; ))))
;
; Alas, that doesn't work on all systems. We hit yet another dark
; corner of the R5RS macros. The reason is that run-test is used in
; the code below to introduce definitions. For example:
; (run-test
; (define (ssax:warn port msg . other-msg)
; (apply cerr (cons* nl "Warning: " msg other-msg)))
; )
; This code expands to
; (begin
; (define (ssax:warn port msg . other-msg) ...))
; so the definition gets spliced in into the top level. Right?
; Well, On Petite Chez Scheme it is so. However, many other systems
; don't like this approach. The reason is that the invocation of
; (run-test (define (ssax:warn port msg . other-msg) ...))
; first expands into
; (letrec-syntax (...)
; (scan-exp ((define (ssax:warn port msg . other-msg) ...)) ...))
; because of the presence of (letrec-syntax ...), the begin form that
; is generated eventually is no longer at the top level! The begin
; form in Scheme is an overloading of two distinct forms: top-level
; begin and the other begin. The forms have different rules: for example,
; (begin (define x 1)) is OK for a top-level begin but not OK for
; the other begin. Some Scheme systems see the that the macro
; (run-test ...) expands into (letrec-syntax ...) and decide right there
; that any further (begin ...) forms are NOT top-level begin forms.
; The only way out is to make sure all our macros are top-level.
; The best approach <sigh> seems to be to make run-test one huge
; top-level macro.
(define-syntax run-test
(syntax-rules (define)
((run-test "scan-exp" (define vars body))
(define vars (run-test "scan-exp" body)))
((run-test "scan-exp" ?body)
(letrec-syntax
((scan-exp ; (scan-exp body k)
(syntax-rules (quote quasiquote !)
((scan-exp '() (k-head ! . args))
(k-head '() . args))
((scan-exp (quote (hd . tl)) k)
(scan-lit-lst (hd . tl) (do-wrap ! quasiquote k)))
((scan-exp (quasiquote (hd . tl)) k)
(scan-lit-lst (hd . tl) (do-wrap ! quasiquote k)))
((scan-exp (quote x) (k-head ! . args))
(k-head
(if (string? (quote x)) (string->symbol (quote x)) (quote x))
. args))
((scan-exp (hd . tl) k)
(scan-exp hd (do-tl ! scan-exp tl k)))
((scan-exp x (k-head ! . args))
(k-head x . args))))
(do-tl
(syntax-rules (!)
((do-tl processed-hd fn () (k-head ! . args))
(k-head (processed-hd) . args))
((do-tl processed-hd fn old-tl k)
(fn old-tl (do-cons ! processed-hd k)))))
(do-cons
(syntax-rules (!)
((do-cons processed-tl processed-hd (k-head ! . args))
(k-head (processed-hd . processed-tl) . args))))
(do-wrap
(syntax-rules (!)
((do-wrap val fn (k-head ! . args))
(k-head (fn val) . args))))
(do-finish
(syntax-rules ()
((do-finish new-body) new-body)))
(scan-lit-lst ; scan literal list
(syntax-rules (quote unquote unquote-splicing !)
((scan-lit-lst '() (k-head ! . args))
(k-head '() . args))
((scan-lit-lst (quote (hd . tl)) k)
(do-tl quote scan-lit-lst ((hd . tl)) k))
((scan-lit-lst (unquote x) k)
(scan-exp x (do-wrap ! unquote k)))
((scan-lit-lst (unquote-splicing x) k)
(scan-exp x (do-wrap ! unquote-splicing k)))
((scan-lit-lst (quote x) (k-head ! . args))
(k-head
,(if (string? (quote x)) (string->symbol (quote x)) (quote x))
. args))
((scan-lit-lst (hd . tl) k)
(scan-lit-lst hd (do-tl ! scan-lit-lst tl k)))
((scan-lit-lst x (k-head ! . args))
(k-head x . args))))
)
(scan-exp ?body (do-finish !))))
((run-test body ...)
(begin
(run-test "scan-exp" body) ...))
))
;========================================================================
; Data Types
; TAG-KIND
; a symbol 'START, 'END, 'PI, 'DECL, 'COMMENT, 'CDSECT
; or 'ENTITY-REF that identifies a markup token
; UNRES-NAME
; a name (called GI in the XML Recommendation) as given in an xml
; document for a markup token: start-tag, PI target, attribute name.
; If a GI is an NCName, UNRES-NAME is this NCName converted into
; a Scheme symbol. If a GI is a QName, UNRES-NAME is a pair of
; symbols: (PREFIX . LOCALPART)
; RES-NAME
; An expanded name, a resolved version of an UNRES-NAME.
; For an element or an attribute name with a non-empty namespace URI,
; RES-NAME is a pair of symbols, (URI-SYMB . LOCALPART).
; Otherwise, it's a single symbol.
; ELEM-CONTENT-MODEL
; A symbol:
; ANY - anything goes, expect an END tag.
; EMPTY-TAG - no content, and no END-tag is coming
; EMPTY - no content, expect the END-tag as the next token
; PCDATA - expect character data only, and no children elements
; MIXED
; ELEM-CONTENT
; URI-SYMB
; A symbol representing a namespace URI -- or other symbol chosen
; by the user to represent URI. In the former case,
; URI-SYMB is created by %-quoting of bad URI characters and
; converting the resulting string into a symbol.
; NAMESPACES
; A list representing namespaces in effect. An element of the list
; has one of the following forms:
; (PREFIX URI-SYMB . URI-SYMB) or
; (PREFIX USER-PREFIX . URI-SYMB)
; USER-PREFIX is a symbol chosen by the user
; to represent the URI.
; (#f USER-PREFIX . URI-SYMB)
; Specification of the user-chosen prefix and a URI-SYMBOL.
; (*DEFAULT* USER-PREFIX . URI-SYMB)
; Declaration of the default namespace
; (*DEFAULT* #f . #f)
; Un-declaration of the default namespace. This notation
; represents overriding of the previous declaration
; A NAMESPACES list may contain several elements for the same PREFIX.
; The one closest to the beginning of the list takes effect.
; ATTLIST
; An ordered collection of (NAME . VALUE) pairs, where NAME is
; a RES-NAME or an UNRES-NAME. The collection is an ADT
; STR-HANDLER
; A procedure of three arguments: STRING1 STRING2 SEED
; returning a new SEED
; The procedure is supposed to handle a chunk of character data
; STRING1 followed by a chunk of character data STRING2.
; STRING2 is a short string, often "\n" and even ""
; ENTITIES
; An assoc list of pairs:
; (named-entity-name . named-entity-body)
; where named-entity-name is a symbol under which the entity was
; declared, named-entity-body is either a string, or
; (for an external entity) a thunk that will return an
; input port (from which the entity can be read).
; named-entity-body may also be #f. This is an indication that a
; named-entity-name is currently being expanded. A reference to
; this named-entity-name will be an error: violation of the
; WFC nonrecursion.
;
; As an extension to the original SSAX, Guile allows a
; named-entity-name of *DEFAULT* to indicate a fallback procedure,
; called as (FALLBACK PORT NAME). The procedure should return a
; string.
; XML-TOKEN -- a record
; In Gambit, you can use the following declaration:
; (define-structure xml-token kind head)
; The following declaration is "standard" as it follows SRFI-9:
;;(define-record-type xml-token (make-xml-token kind head) xml-token?
;; (kind xml-token-kind)
;; (head xml-token-head) )
; No field mutators are declared as SSAX is a pure functional parser
;
; But to make the code more portable, we define xml-token simply as
; a pair. It suffices for us. Furthermore, xml-token-kind and xml-token-head
; can be defined as simple procedures. However, they are declared as
; macros below for efficiency.
(define (make-xml-token kind head) (cons kind head))
(define xml-token? pair?)
(define-syntax xml-token-kind
(syntax-rules () ((xml-token-kind token) (car token))))
(define-syntax xml-token-head
(syntax-rules () ((xml-token-head token) (cdr token))))
; (define-macro xml-token-kind (lambda (token) `(car ,token)))
; (define-macro xml-token-head (lambda (token) `(cdr ,token)))
; This record represents a markup, which is, according to the XML
; Recommendation, "takes the form of start-tags, end-tags, empty-element tags,
; entity references, character references, comments, CDATA section delimiters,
; document type declarations, and processing instructions."
;
; kind -- a TAG-KIND
; head -- an UNRES-NAME. For xml-tokens of kinds 'COMMENT and
; 'CDSECT, the head is #f
;
; For example,
; <P> => kind='START, head='P
; </P> => kind='END, head='P
; <BR/> => kind='EMPTY-EL, head='BR
; <!DOCTYPE OMF ...> => kind='DECL, head='DOCTYPE
; <?xml version="1.0"?> => kind='PI, head='xml
; &my-ent; => kind = 'ENTITY-REF, head='my-ent
;
; Character references are not represented by xml-tokens as these references
; are transparently resolved into the corresponding characters.
;
; XML-DECL -- a record
; The following is Gambit-specific, see below for a portable declaration
;(define-structure xml-decl elems entities notations)
; The record represents a datatype of an XML document: the list of
; declared elements and their attributes, declared notations, list of
; replacement strings or loading procedures for parsed general
; entities, etc. Normally an xml-decl record is created from a DTD or
; an XML Schema, although it can be created and filled in in many other
; ways (e.g., loaded from a file).
;
; elems: an (assoc) list of decl-elem or #f. The latter instructs
; the parser to do no validation of elements and attributes.
;
; decl-elem: declaration of one element:
; (elem-name elem-content decl-attrs)
; elem-name is an UNRES-NAME for the element.
; elem-content is an ELEM-CONTENT-MODEL.
; decl-attrs is an ATTLIST, of (ATTR-NAME . VALUE) associations
; !!!This element can declare a user procedure to handle parsing of an
; element (e.g., to do a custom validation, or to build a hash of
; IDs as they're encountered).
;
; decl-attr: an element of an ATTLIST, declaration of one attribute
; (attr-name content-type use-type default-value)
; attr-name is an UNRES-NAME for the declared attribute
; content-type is a symbol: CDATA, NMTOKEN, NMTOKENS, ...
; or a list of strings for the enumerated type.
; use-type is a symbol: REQUIRED, IMPLIED, FIXED
; default-value is a string for the default value, or #f if not given.
;
;
; see a function make-empty-xml-decl to make a XML declaration entry
; suitable for a non-validating parsing.
;-------------------------
; Utilities
; ssax:warn PORT MESSAGE SPECIALISING-MSG*
; to notify the user about warnings that are NOT errors but still
; may alert the user.
; Result is unspecified.
; We need to define the function to allow the self-tests to run.
; Normally the definition of ssax:warn is to be provided by the user.
(run-test
(define (ssax:warn port msg . other-msg)
(apply cerr (cons* nl "Warning: " msg other-msg)))
)
; parser-error PORT MESSAGE SPECIALISING-MSG*
; to let the user know of a syntax error or a violation of a
; well-formedness or validation constraint.
; Result is unspecified.
; We need to define the function to allow the self-tests to run.
; Normally the definition of parser-error is to be provided by the user.
(run-test
(define (parser-error port msg . specializing-msgs)
(apply error (cons msg specializing-msgs)))
)
; The following is a function that is often used in validation tests,
; to make sure that the computed result matches the expected one.
; This function is a standard equal? predicate with one exception.
; On Scheme systems where (string->symbol "A") and a symbol A
; are the same, equal_? is precisely equal?
; On other Scheme systems, we compare symbols disregarding their case.
; Since this function is used only in tests, we don't have to
; strive to make it efficient.
(run-test
(define (equal_? e1 e2)
(if (eq? 'A (string->symbol "A")) (equal? e1 e2)
(cond
((symbol? e1)
(and (symbol? e2)
(string-ci=? (symbol->string e1) (symbol->string e2))))
((pair? e1)
(and (pair? e2)
(equal_? (car e1) (car e2)) (equal_? (cdr e1) (cdr e2))))
((vector? e1)
(and (vector? e2) (equal_? (vector->list e1) (vector->list e2))))
(else
(equal? e1 e2)))))
)
; The following function, which is often used in validation tests,
; lets us conveniently enter newline, CR and tab characters in a character
; string.
; unesc-string: ESC-STRING -> STRING
; where ESC-STRING is a character string that may contain
; %n -- for #\newline
; %r -- for #\return
; %t -- for #\tab
; %% -- for #\%
;
; The result of unesc-string is a character string with all %-combinations
; above replaced with their character equivalents
(run-test
(define (unesc-string str)
(call-with-input-string str
(lambda (port)
(let loop ((frags '()))
(let* ((token (next-token '() '(#\% *eof*) "unesc-string" port))
(cterm (read-char port))
(frags (cons token frags)))
(if (eof-object? cterm) (string-concatenate-reverse/shared frags)
(let ((cchar (read-char port))) ; char after #\%
(if (eof-object? cchar)
(error "unexpected EOF after reading % in unesc-string:" str)
(loop
(cons
(case cchar
((#\n) (string #\newline))
((#\r) (string char-return))
((#\t) (string char-tab))
((#\%) "%")
(else (error "bad %-char in unesc-string:" cchar)))
frags))))))))))
)
; Test if a string is made of only whitespace
; An empty string is considered made of whitespace as well
(define (string-whitespace? str)
(let ((len (string-length str)))
(cond
((zero? len) #t)
((= 1 len) (char-whitespace? (string-ref str 0)))
((= 2 len) (and (char-whitespace? (string-ref str 0))
(char-whitespace? (string-ref str 1))))
(else
(let loop ((i 0))
(or (>= i len)
(and (char-whitespace? (string-ref str i))
(loop (inc i)))))))))
; Find val in alist
; Return (values found-el remaining-alist) or
; (values #f alist)
(define (assq-values val alist)
(let loop ((alist alist) (scanned '()))
(cond
((null? alist) (values #f scanned))
((equal? val (caar alist))
(values (car alist) (append scanned (cdr alist))))
(else
(loop (cdr alist) (cons (car alist) scanned))))))
; From SRFI-1
(define (fold-right kons knil lis1)
(let recur ((lis lis1))
(if (null? lis) knil
(let ((head (car lis)))
(kons head (recur (cdr lis)))))))
; Left fold combinator for a single list
(define (fold kons knil lis1)
(let lp ((lis lis1) (ans knil))
(if (null? lis) ans
(lp (cdr lis) (kons (car lis) ans)))))
;========================================================================
; Lower-level parsers and scanners
;
; They deal with primitive lexical units (Names, whitespaces, tags)
; and with pieces of more generic productions. Most of these parsers
; must be called in appropriate context. For example, ssax:complete-start-tag
; must be called only when the start-tag has been detected and its GI
; has been read.
;------------------------------------------------------------------------
; Low-level parsing code
; Skip the S (whitespace) production as defined by
; [3] S ::= (#x20 | #x9 | #xD | #xA)
; The procedure returns the first not-whitespace character it
; encounters while scanning the PORT. This character is left
; on the input stream.
(define ssax:S-chars (map ascii->char '(32 10 9 13)))
(define (ssax:skip-S port)
(skip-while ssax:S-chars port))
; Read a Name lexem and return it as string
; [4] NameChar ::= Letter | Digit | '.' | '-' | '_' | ':'
; | CombiningChar | Extender
; [5] Name ::= (Letter | '_' | ':') (NameChar)*
;
; This code supports the XML Namespace Recommendation REC-xml-names,
; which modifies the above productions as follows:
;
; [4] NCNameChar ::= Letter | Digit | '.' | '-' | '_'
; | CombiningChar | Extender
; [5] NCName ::= (Letter | '_') (NCNameChar)*
; As the Rec-xml-names says,
; "An XML document conforms to this specification if all other tokens
; [other than element types and attribute names] in the document which
; are required, for XML conformance, to match the XML production for
; Name, match this specification's production for NCName."
; Element types and attribute names must match the production QName,
; defined below.
; Check to see if a-char may start a NCName
(define (ssax:ncname-starting-char? a-char)
(and (char? a-char)
(or
(char-alphabetic? a-char)
(char=? #\_ a-char))))
; Read a NCName starting from the current position in the PORT and
; return it as a symbol.
(define (ssax:read-NCName port)
(let ((first-char (peek-char port)))
(or (ssax:ncname-starting-char? first-char)
(parser-error port "XMLNS [4] for '" first-char "'")))
(string->symbol
(next-token-of
(lambda (c)
(cond
((eof-object? c) #f)
((char-alphabetic? c) c)
((string-index "0123456789.-_" c) c)
(else #f)))
port)))
; Read a (namespace-) Qualified Name, QName, from the current
; position in the PORT.
; From REC-xml-names:
; [6] QName ::= (Prefix ':')? LocalPart
; [7] Prefix ::= NCName
; [8] LocalPart ::= NCName
; Return: an UNRES-NAME
(define (ssax:read-QName port)
(let ((prefix-or-localpart (ssax:read-NCName port)))
(case (peek-char port)
((#\:) ; prefix was given after all
(read-char port) ; consume the colon
(cons prefix-or-localpart (ssax:read-NCName port)))
(else prefix-or-localpart) ; Prefix was omitted
)))
; The prefix of the pre-defined XML namespace
(define ssax:Prefix-XML (string->symbol "xml"))
(run-test
(assert (eq? '_
(call-with-input-string "_" ssax:read-NCName)))
(assert (eq? '_
(call-with-input-string "_" ssax:read-QName)))
(assert (eq? (string->symbol "_abc_")
(call-with-input-string "_abc_;" ssax:read-NCName)))
(assert (eq? (string->symbol "_abc_")
(call-with-input-string "_abc_;" ssax:read-QName)))
(assert (eq? (string->symbol "_a.b")
(call-with-input-string "_a.b " ssax:read-QName)))
(assert (equal? (cons (string->symbol "_a.b") (string->symbol "d.1-ef-"))
(call-with-input-string "_a.b:d.1-ef-;" ssax:read-QName)))
(assert (equal? (cons (string->symbol "a") (string->symbol "b"))
(call-with-input-string "a:b:c" ssax:read-QName)))
(assert (failed? (call-with-input-string ":abc" ssax:read-NCName)))
(assert (failed? (call-with-input-string "1:bc" ssax:read-NCName)))
)
; Compare one RES-NAME or an UNRES-NAME with the other.
; Return a symbol '<, '>, or '= depending on the result of
; the comparison.
; Names without PREFIX are always smaller than those with the PREFIX.
(define name-compare
(letrec ((symbol-compare
(lambda (symb1 symb2)
(cond
((eq? symb1 symb2) '=)
((string<? (symbol->string symb1) (symbol->string symb2))
'<)
(else '>)))))
(lambda (name1 name2)
(cond
((symbol? name1) (if (symbol? name2) (symbol-compare name1 name2)
'<))
((symbol? name2) '>)
((eq? name2 ssax:largest-unres-name) '<)
((eq? name1 ssax:largest-unres-name) '>)
((eq? (car name1) (car name2)) ; prefixes the same
(symbol-compare (cdr name1) (cdr name2)))
(else (symbol-compare (car name1) (car name2)))))))
; An UNRES-NAME that is postulated to be larger than anything that can occur in
; a well-formed XML document.
; name-compare enforces this postulate.
(define ssax:largest-unres-name (cons
(string->symbol "#LARGEST-SYMBOL")
(string->symbol "#LARGEST-SYMBOL")))
(run-test
(assert (eq? '= (name-compare 'ABC 'ABC)))
(assert (eq? '< (name-compare 'ABC 'ABCD)))
(assert (eq? '> (name-compare 'XB 'ABCD)))
(assert (eq? '> (name-compare '(HTML . PRE) 'PRE)))
(assert (eq? '< (name-compare 'HTML '(HTML . PRE))))
(assert (eq? '= (name-compare '(HTML . PRE) '(HTML . PRE))))
(assert (eq? '< (name-compare '(HTML . PRE) '(XML . PRE))))
(assert (eq? '> (name-compare '(HTML . PRE) '(HTML . P))))
(assert (eq? '< (name-compare '(HTML . PRE) ssax:largest-unres-name)))
(assert (eq? '< (name-compare '(ZZZZ . ZZZ) ssax:largest-unres-name)))
(assert (eq? '> (name-compare ssax:largest-unres-name '(ZZZZ . ZZZ) )))
)
; procedure: ssax:read-markup-token PORT
; This procedure starts parsing of a markup token. The current position
; in the stream must be #\<. This procedure scans enough of the input stream
; to figure out what kind of a markup token it is seeing. The procedure returns
; an xml-token structure describing the token. Note, generally reading
; of the current markup is not finished! In particular, no attributes of
; the start-tag token are scanned.
;
; Here's a detailed break out of the return values and the position in the PORT
; when that particular value is returned:
; PI-token: only PI-target is read.
; To finish the Processing Instruction and disregard it,
; call ssax:skip-pi. ssax:read-attributes may be useful
; as well (for PIs whose content is attribute-value
; pairs)
; END-token: The end tag is read completely; the current position
; is right after the terminating #\> character.
; COMMENT is read and skipped completely. The current position
; is right after "-->" that terminates the comment.
; CDSECT The current position is right after "<!CDATA["
; Use ssax:read-cdata-body to read the rest.
; DECL We have read the keyword (the one that follows "<!")
; identifying this declaration markup. The current
; position is after the keyword (usually a
; whitespace character)
;
; START-token We have read the keyword (GI) of this start tag.
; No attributes are scanned yet. We don't know if this
; tag has an empty content either.
; Use ssax:complete-start-tag to finish parsing of
; the token.
(define ssax:read-markup-token ; procedure ssax:read-markup-token port
(let ()
; we have read "<!-". Skip through the rest of the comment
; Return the 'COMMENT token as an indication we saw a comment
; and skipped it.
(define (skip-comment port)
(assert-curr-char '(#\-) "XML [15], second dash" port)
(if (not (find-string-from-port? "-->" port))
(parser-error port "XML [15], no -->"))
(make-xml-token 'COMMENT #f))
; we have read "<![" that must begin a CDATA section
(define (read-cdata port)
(assert (string=? "CDATA[" (read-string 6 port)))
(make-xml-token 'CDSECT #f))
(lambda (port)
(assert-curr-char '(#\<) "start of the token" port)
(case (peek-char port)
((#\/) (read-char port)
(begin0 (make-xml-token 'END (ssax:read-QName port))
(ssax:skip-S port)
(assert-curr-char '(#\>) "XML [42]" port)))
((#\?) (read-char port) (make-xml-token 'PI (ssax:read-NCName port)))
((#\!)
(case (peek-next-char port)
((#\-) (read-char port) (skip-comment port))
((#\[) (read-char port) (read-cdata port))
(else (make-xml-token 'DECL (ssax:read-NCName port)))))
(else (make-xml-token 'START (ssax:read-QName port)))))
))
; The current position is inside a PI. Skip till the rest of the PI
(define (ssax:skip-pi port)
(if (not (find-string-from-port? "?>" port))
(parser-error port "Failed to find ?> terminating the PI")))
; The current position is right after reading the PITarget. We read the
; body of PI and return is as a string. The port will point to the
; character right after '?>' combination that terminates PI.
; [16] PI ::= '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>'
(define (ssax:read-pi-body-as-string port)
(ssax:skip-S port) ; skip WS after the PI target name
(string-concatenate/shared
(let loop ()
(let ((pi-fragment
(next-token '() '(#\?) "reading PI content" port)))
(if (eqv? #\> (peek-next-char port))
(begin
(read-char port)
(cons pi-fragment '()))
(cons* pi-fragment "?" (loop)))))))
(run-test
(assert (equal? "p1 content "
(call-with-input-string "<?pi1 p1 content ?>"
(lambda (port)
(ssax:read-markup-token port)
(ssax:read-pi-body-as-string port)))))
(assert (equal? "pi2? content? ?"
(call-with-input-string "<?pi2 pi2? content? ??>"
(lambda (port)
(ssax:read-markup-token port)
(ssax:read-pi-body-as-string port)))))
)
;(define (ssax:read-pi-body-as-name-values port)
; The current pos in the port is inside an internal DTD subset
; (e.g., after reading #\[ that begins an internal DTD subset)
; Skip until the "]>" combination that terminates this DTD
(define (ssax:skip-internal-dtd port)
(if (not (find-string-from-port? "]>" port))
(parser-error port
"Failed to find ]> terminating the internal DTD subset")))
; procedure+: ssax:read-cdata-body PORT STR-HANDLER SEED
;
; This procedure must be called after we have read a string "<![CDATA["
; that begins a CDATA section. The current position must be the first
; position of the CDATA body. This function reads _lines_ of the CDATA
; body and passes them to a STR-HANDLER, a character data consumer.
;
; The str-handler is a STR-HANDLER, a procedure STRING1 STRING2 SEED.
; The first STRING1 argument to STR-HANDLER never contains a newline.
; The second STRING2 argument often will. On the first invocation of
; the STR-HANDLER, the seed is the one passed to ssax:read-cdata-body
; as the third argument. The result of this first invocation will be
; passed as the seed argument to the second invocation of the line
; consumer, and so on. The result of the last invocation of the
; STR-HANDLER is returned by the ssax:read-cdata-body. Note a
; similarity to the fundamental 'fold' iterator.
;
; Within a CDATA section all characters are taken at their face value,
; with only three exceptions:
; CR, LF, and CRLF are treated as line delimiters, and passed
; as a single #\newline to the STR-HANDLER
; "]]>" combination is the end of the CDATA section.
; &gt; is treated as an embedded #\> character
; Note, &lt; and &amp; are not specially recognized (and are not expanded)!
(define ssax:read-cdata-body
(let ((cdata-delimiters (list char-return #\newline #\] #\&)))
(lambda (port str-handler seed)
(let loop ((seed seed))
(let ((fragment (next-token '() cdata-delimiters
"reading CDATA" port)))
; that is, we're reading the char after the 'fragment'
(case (read-char port)
((#\newline) (loop (str-handler fragment nl seed)))
((#\])
(if (not (eqv? (peek-char port) #\]))
(loop (str-handler fragment "]" seed))
(let check-after-second-braket
((seed (if (string-null? fragment) seed
(str-handler fragment "" seed))))
(case (peek-next-char port) ; after the second bracket
((#\>) (read-char port) seed) ; we have read "]]>"
((#\]) (check-after-second-braket
(str-handler "]" "" seed)))
(else (loop (str-handler "]]" "" seed)))))))
((#\&) ; Note that #\& within CDATA may stand for itself
(let ((ent-ref ; it does not have to start an entity ref
(next-token-of (lambda (c)
(and (not (eof-object? c)) (char-alphabetic? c) c)) port)))
(cond ; "&gt;" is to be replaced with #\>
((and (string=? "gt" ent-ref) (eqv? (peek-char port) #\;))
(read-char port)
(loop (str-handler fragment ">" seed)))
(else
(loop
(str-handler ent-ref ""
(str-handler fragment "&" seed)))))))
(else ; Must be CR: if the next char is #\newline, skip it
(if (eqv? (peek-char port) #\newline) (read-char port))
(loop (str-handler fragment nl seed)))
))))))
; a few lines of validation code
(run-test (letrec
((consumer (lambda (fragment foll-fragment seed)
(cons* (if (equal? foll-fragment (string #\newline))
" NL" foll-fragment) fragment seed)))
(test (lambda (str expected-result)
(newline) (display "body: ") (write str)
(newline) (display "Result: ")
(let ((result
(reverse
(call-with-input-string (unesc-string str)
(lambda (port) (ssax:read-cdata-body port consumer '()))
))))
(write result)
(assert (equal? result expected-result)))))
)
(test "]]>" '())
(test "abcd]]>" '("abcd" ""))
(test "abcd]]]>" '("abcd" "" "]" ""))
(test "abcd]]]]>" '("abcd" "" "]" "" "]" ""))
(test "abcd]]]]]>" '("abcd" "" "]" "" "]" "" "]" ""))
(test "abcd]]]a]]>" '("abcd" "" "]" "" "]]" "" "a" ""))
(test "abc%r%ndef%n]]>" '("abc" " NL" "def" " NL"))
(test "%r%n%r%n]]>" '("" " NL" "" " NL"))
(test "%r%n%r%na]]>" '("" " NL" "" " NL" "a" ""))
(test "%r%r%r%na]]>" '("" " NL" "" " NL" "" " NL" "a" ""))
(test "abc&!!!]]>" '("abc" "&" "" "" "!!!" ""))
(test "abc]]&gt;&gt&amp;]]]&gt;and]]>"
'("abc" "" "]]" "" "" ">" "" "&" "gt" "" "" "&" "amp" "" ";" "" "]" ""
"]]" "" "" ">" "and" ""))
))
; procedure+: ssax:read-char-ref PORT
;
; [66] CharRef ::= '&#' [0-9]+ ';'
; | '&#x' [0-9a-fA-F]+ ';'
;
; This procedure must be called after we we have read "&#"
; that introduces a char reference.
; The procedure reads this reference and returns the corresponding char
; The current position in PORT will be after ";" that terminates
; the char reference
; Faults detected:
; WFC: XML-Spec.html#wf-Legalchar
;
; According to Section "4.1 Character and Entity References"
; of the XML Recommendation:
; "[Definition: A character reference refers to a specific character
; in the ISO/IEC 10646 character set, for example one not directly
; accessible from available input devices.]"
; Therefore, we use a ucscode->string function to convert a character
; code into the character -- *regardless* of the current character
; encoding of the input stream.
(define (ssax:read-char-ref port)
(let* ((base
(cond ((eqv? (peek-char port) #\x) (read-char port) 16)
(else 10)))
(name (next-token '() '(#\;) "XML [66]" port))
(char-code (string->number name base)))
(read-char port) ; read the terminating #\; char
(if (integer? char-code) (ucscode->string char-code)
(parser-error port "[wf-Legalchar] broken for '" name "'"))))
; procedure+: ssax:handle-parsed-entity PORT NAME ENTITIES
; CONTENT-HANDLER STR-HANDLER SEED
;
; Expand and handle a parsed-entity reference
; port - a PORT
; name - the name of the parsed entity to expand, a symbol
; entities - see ENTITIES
; content-handler -- procedure PORT ENTITIES SEED
; that is supposed to return a SEED
; str-handler - a STR-HANDLER. It is called if the entity in question
; turns out to be a pre-declared entity
;
; The result is the one returned by CONTENT-HANDLER or STR-HANDLER
; Faults detected:
; WFC: XML-Spec.html#wf-entdeclared
; WFC: XML-Spec.html#norecursion
(define ssax:predefined-parsed-entities
`(
(,(string->symbol "amp") . "&")
(,(string->symbol "lt") . "<")
(,(string->symbol "gt") . ">")
(,(string->symbol "apos") . "'")
(,(string->symbol "quot") . "\"")))
(define (ssax:handle-parsed-entity port name entities
content-handler str-handler seed)
(cond ; First we check the list of the declared entities
((assq name entities) =>
(lambda (decl-entity)
(let ((ent-body (cdr decl-entity)) ; mark the list to prevent recursion
(new-entities (cons (cons name #f) entities)))
(cond
((string? ent-body)
(call-with-input-string ent-body
(lambda (port) (content-handler port new-entities seed))))
((procedure? ent-body)
(let ((port (ent-body)))
(begin0
(content-handler port new-entities seed)
(close-input-port port))))
(else
(parser-error port "[norecursion] broken for " name))))))
((assq name ssax:predefined-parsed-entities)
=> (lambda (decl-entity)
(str-handler (cdr decl-entity) "" seed)))
((assq '*DEFAULT* entities) =>
(lambda (decl-entity)
(let ((fallback (cdr decl-entity))
(new-entities (cons (cons name #f) entities)))
(cond
((procedure? fallback)
(call-with-input-string (fallback port name)
(lambda (port) (content-handler port new-entities seed))))
(else
(parser-error port "[norecursion] broken for " name))))))
(else (parser-error port "[wf-entdeclared] broken for " name))))
; The ATTLIST Abstract Data Type
; Currently is implemented as an assoc list sorted in the ascending
; order of NAMES.
(define (make-empty-attlist) '())
; Add a name-value pair to the existing attlist preserving the order
; Return the new list, in the sorted ascending order.
; Return #f if a pair with the same name already exists in the attlist
(define (attlist-add attlist name-value)
(if (null? attlist) (cons name-value attlist)
(case (name-compare (car name-value) (caar attlist))
((=) #f)
((<) (cons name-value attlist))
(else (cons (car attlist) (attlist-add (cdr attlist) name-value)))
)))
(define attlist-null? null?)
; Given an non-null attlist, return a pair of values: the top and the rest
(define (attlist-remove-top attlist)
(values (car attlist) (cdr attlist)))
(define (attlist->alist attlist) attlist)
(define attlist-fold fold)
; procedure+: ssax:read-attributes PORT ENTITIES
;
; This procedure reads and parses a production Attribute*
; [41] Attribute ::= Name Eq AttValue
; [10] AttValue ::= '"' ([^<&"] | Reference)* '"'
; | "'" ([^<&'] | Reference)* "'"
; [25] Eq ::= S? '=' S?
;
;
; The procedure returns an ATTLIST, of Name (as UNRES-NAME), Value (as string)
; pairs. The current character on the PORT is a non-whitespace character
; that is not an ncname-starting character.
;
; Note the following rules to keep in mind when reading an 'AttValue'
; "Before the value of an attribute is passed to the application
; or checked for validity, the XML processor must normalize it as follows:
; - a character reference is processed by appending the referenced
; character to the attribute value
; - an entity reference is processed by recursively processing the
; replacement text of the entity [see ENTITIES]
; [named entities amp lt gt quot apos are assumed pre-declared]
; - a whitespace character (#x20, #xD, #xA, #x9) is processed by appending #x20
; to the normalized value, except that only a single #x20 is appended for a
; "#xD#xA" sequence that is part of an external parsed entity or the
; literal entity value of an internal parsed entity
; - other characters are processed by appending them to the normalized value "
;
;
; Faults detected:
; WFC: XML-Spec.html#CleanAttrVals
; WFC: XML-Spec.html#uniqattspec
(define ssax:read-attributes ; ssax:read-attributes port entities
(let ((value-delimeters (append ssax:S-chars '(#\< #\&))))
; Read the AttValue from the PORT up to the delimiter
; (which can be a single or double-quote character,
; or even a symbol *eof*)
; 'prev-fragments' is the list of string fragments, accumulated
; so far, in reverse order.
; Return the list of fragments with newly read fragments
; prepended.
(define (read-attrib-value delimiter port entities prev-fragments)
(let* ((new-fragments
(cons (next-token '() (cons delimiter value-delimeters)
"XML [10]" port)
prev-fragments))
(cterm (read-char port)))
(cond
((or (eof-object? cterm) (eqv? cterm delimiter))
new-fragments)
((eqv? cterm char-return) ; treat a CR and CRLF as a LF
(if (eqv? (peek-char port) #\newline) (read-char port))
(read-attrib-value delimiter port entities
(cons " " new-fragments)))
((memv cterm ssax:S-chars)
(read-attrib-value delimiter port entities
(cons " " new-fragments)))
((eqv? cterm #\&)
(cond
((eqv? (peek-char port) #\#)
(read-char port)
(read-attrib-value delimiter port entities
(cons (ssax:read-char-ref port) new-fragments)))
(else
(read-attrib-value delimiter port entities
(read-named-entity port entities new-fragments)))))
(else (parser-error port "[CleanAttrVals] broken")))))
; we have read "&" that introduces a named entity reference.
; read this reference and return the result of
; normalizing of the corresponding string
; (that is, read-attrib-value is applied to the replacement
; text of the entity)
; The current position will be after ";" that terminates
; the entity reference
(define (read-named-entity port entities fragments)
(let ((name (ssax:read-NCName port)))
(assert-curr-char '(#\;) "XML [68]" port)
(ssax:handle-parsed-entity port name entities
(lambda (port entities fragments)
(read-attrib-value '*eof* port entities fragments))
(lambda (str1 str2 fragments)
(if (equal? "" str2) (cons str1 fragments)
(cons* str2 str1 fragments)))
fragments)))
(lambda (port entities)
(let loop ((attr-list (make-empty-attlist)))
(if (not (ssax:ncname-starting-char? (ssax:skip-S port))) attr-list
(let ((name (ssax:read-QName port)))
(ssax:skip-S port)
(assert-curr-char '(#\=) "XML [25]" port)
(ssax:skip-S port)
(let ((delimiter
(assert-curr-char '(#\' #\" ) "XML [10]" port)))
(loop
(or (attlist-add attr-list
(cons name
(string-concatenate-reverse/shared
(read-attrib-value delimiter port entities
'()))))
(parser-error port "[uniqattspec] broken for " name))))))))
))
; a few lines of validation code
(run-test (letrec
((test (lambda (str decl-entities expected-res)
(newline) (display "input: ") (write str)
(newline) (display "Result: ")
(let ((result
(call-with-input-string (unesc-string str)
(lambda (port)
(ssax:read-attributes port decl-entities)))))
(write result) (newline)
(assert (equal? result expected-res))))))
(test "" '() '())
(test "href='http://a%tb%r%n%r%n%nc'" '()
`((,(string->symbol "href") . "http://a b c")))
(test "href='http://a%tb%r%r%n%rc'" '()
`((,(string->symbol "href") . "http://a b c")))
(test "_1 ='12&amp;' _2= \"%r%n%t12&#10;3\">" '()
`((_1 . "12&") (_2 . ,(unesc-string " 12%n3"))))
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
'((ent . "&lt;xx&gt;"))
`((,(string->symbol "Abc") . ,(unesc-string "<&>%n"))
(,(string->symbol "Next") . "12<xx>34")))
(test "%tAbc='&lt;&amp;&gt;&#x0d;'%nNext='12&ent;34' />"
'((ent . "&lt;xx&gt;"))
`((,(string->symbol "Abc") . ,(unesc-string "<&>%r"))
(,(string->symbol "Next") . "12<xx>34")))
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&en;34' />"
`((en . ,(lambda () (open-input-string "&quot;xx&apos;"))))
`((,(string->symbol "Abc") . ,(unesc-string "<&>%n"))
(,(string->symbol "Next") . "12\"xx'34")))
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
'((ent . "&lt;&ent1;T;&gt;") (ent1 . "&amp;"))
`((,(string->symbol "Abc") . ,(unesc-string "<&>%n"))
(,(string->symbol "Next") . "12<&T;>34")))
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
`((*DEFAULT* . ,(lambda (port name)
(case name
((ent) "&lt;&ent1;T;&gt;")
((ent1) "&amp;")
(else (error "unrecognized" name))))))
`((,(string->symbol "Abc") . ,(unesc-string "<&>%n"))
(,(string->symbol "Next") . "12<&T;>34")))
(assert (failed?
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
'((ent . "<&ent1;T;&gt;") (ent1 . "&amp;")) '())))
(assert (failed?
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
'((ent . "&lt;&ent;T;&gt;") (ent1 . "&amp;")) '())))
(assert (failed?
(test "%tAbc='&lt;&amp;&gt;&#x0A;'%nNext='12&ent;34' />"
'((ent . "&lt;&ent1;T;&gt;") (ent1 . "&ent;")) '())))
(test "html:href='http://a%tb%r%n%r%n%nc'" '()
`(((,(string->symbol "html") . ,(string->symbol "href"))
. "http://a b c")))
(test "html:href='ref1' html:src='ref2'" '()
`(((,(string->symbol "html") . ,(string->symbol "href"))
. "ref1")
((,(string->symbol "html") . ,(string->symbol "src"))
. "ref2")))
(test "html:href='ref1' xml:html='ref2'" '()
`(((,(string->symbol "html") . ,(string->symbol "href"))
. "ref1")
((,ssax:Prefix-XML . ,(string->symbol "html"))
. "ref2")))
(assert (failed? (test "html:href='ref1' html:href='ref2'" '() '())))
(assert (failed? (test "html:href='<' html:href='ref2'" '() '())))
(assert (failed? (test "html:href='ref1' html:href='&ref2;'" '() '())))
))
; ssax:resolve-name PORT UNRES-NAME NAMESPACES apply-default-ns?
;
; Convert an UNRES-NAME to a RES-NAME given the appropriate NAMESPACES
; declarations.
; the last parameter apply-default-ns? determines if the default
; namespace applies (for instance, it does not for attribute names)
;
; Per REC-xml-names/#nsc-NSDeclared, "xml" prefix is considered pre-declared
; and bound to the namespace name "http://www.w3.org/XML/1998/namespace".
;
; This procedure tests for the namespace constraints:
; http://www.w3.org/TR/REC-xml-names/#nsc-NSDeclared
(define (ssax:resolve-name port unres-name namespaces apply-default-ns?)
(cond
((pair? unres-name) ; it's a QNAME
(cons
(cond
((assq (car unres-name) namespaces) => cadr)
((eq? (car unres-name) ssax:Prefix-XML) ssax:Prefix-XML)
(else
(parser-error port "[nsc-NSDeclared] broken; prefix " (car unres-name))))
(cdr unres-name)))
(apply-default-ns? ; Do apply the default namespace, if any
(let ((default-ns (assq '*DEFAULT* namespaces)))
(if (and default-ns (cadr default-ns))
(cons (cadr default-ns) unres-name)
unres-name))) ; no default namespace declared
(else unres-name))) ; no prefix, don't apply the default-ns
(run-test
(let* ((namespaces
'((HTML UHTML . URN-HTML)
(HTML UHTML-1 . URN-HTML)
(A UHTML . URN-HTML)))
(namespaces-def
(cons
'(*DEFAULT* DEF . URN-DEF) namespaces))
(namespaces-undef
(cons
'(*DEFAULT* #f . #f) namespaces-def))
(port (current-input-port)))
(assert (equal? 'ABC
(ssax:resolve-name port 'ABC namespaces #t)))
(assert (equal? '(DEF . ABC)
(ssax:resolve-name port 'ABC namespaces-def #t)))
(assert (equal? 'ABC
(ssax:resolve-name port 'ABC namespaces-def #f)))
(assert (equal? 'ABC
(ssax:resolve-name port 'ABC namespaces-undef #t)))
(assert (equal? '(UHTML . ABC)
(ssax:resolve-name port '(HTML . ABC) namespaces-def #t)))
(assert (equal? '(UHTML . ABC)
(ssax:resolve-name port '(HTML . ABC) namespaces-def #f)))
(assert (equal? `(,ssax:Prefix-XML . space)
(ssax:resolve-name port
`(,(string->symbol "xml") . space) namespaces-def #f)))
(assert (failed?
(ssax:resolve-name port '(XXX . ABC) namespaces-def #f)))
))
; procedure+: ssax:uri-string->symbol URI-STR
; Convert a URI-STR to an appropriate symbol
(define (ssax:uri-string->symbol uri-str)
(string->symbol uri-str))
; procedure+: ssax:complete-start-tag TAG PORT ELEMS ENTITIES NAMESPACES
;
; This procedure is to complete parsing of a start-tag markup. The
; procedure must be called after the start tag token has been
; read. TAG is an UNRES-NAME. ELEMS is an instance of xml-decl::elems;
; it can be #f to tell the function to do _no_ validation of elements
; and their attributes.
;
; This procedure returns several values:
; ELEM-GI: a RES-NAME.
; ATTRIBUTES: element's attributes, an ATTLIST of (RES-NAME . STRING)
; pairs. The list does NOT include xmlns attributes.
; NAMESPACES: the input list of namespaces amended with namespace
; (re-)declarations contained within the start-tag under parsing
; ELEM-CONTENT-MODEL
; On exit, the current position in PORT will be the first character after
; #\> that terminates the start-tag markup.
;
; Faults detected:
; VC: XML-Spec.html#enum
; VC: XML-Spec.html#RequiredAttr
; VC: XML-Spec.html#FixedAttr
; VC: XML-Spec.html#ValueType
; WFC: XML-Spec.html#uniqattspec (after namespaces prefixes are resolved)
; VC: XML-Spec.html#elementvalid
; WFC: REC-xml-names/#dt-NSName
; Note, although XML Recommendation does not explicitly say it,
; xmlns and xmlns: attributes don't have to be declared (although they
; can be declared, to specify their default value)
; Procedure: ssax:complete-start-tag tag-head port elems entities namespaces
(define ssax:complete-start-tag
(let ((xmlns (string->symbol "xmlns"))
(largest-dummy-decl-attr (list ssax:largest-unres-name #f #f #f)))
; Scan through the attlist and validate it, against decl-attrs
; Return an assoc list with added fixed or implied attrs.
; Note that both attlist and decl-attrs are ATTLISTs, and therefore,
; sorted
(define (validate-attrs port attlist decl-attrs)
; Check to see decl-attr is not of use type REQUIRED. Add
; the association with the default value, if any declared
(define (add-default-decl decl-attr result)
(let*-values
(((attr-name content-type use-type default-value)
(apply values decl-attr)))
(and (eq? use-type 'REQUIRED)
(parser-error port "[RequiredAttr] broken for" attr-name))
(if default-value
(cons (cons attr-name default-value) result)
result)))
(let loop ((attlist attlist) (decl-attrs decl-attrs) (result '()))
(if (attlist-null? attlist)
(attlist-fold add-default-decl result decl-attrs)
(let*-values
(((attr attr-others)
(attlist-remove-top attlist))
((decl-attr other-decls)
(if (attlist-null? decl-attrs)
(values largest-dummy-decl-attr decl-attrs)
(attlist-remove-top decl-attrs)))
)
(case (name-compare (car attr) (car decl-attr))
((<)
(if (or (eq? xmlns (car attr))
(and (pair? (car attr)) (eq? xmlns (caar attr))))
(loop attr-others decl-attrs (cons attr result))
(parser-error port "[ValueType] broken for " attr)))
((>)
(loop attlist other-decls
(add-default-decl decl-attr result)))
(else ; matched occurrence of an attr with its declaration
(let*-values
(((attr-name content-type use-type default-value)
(apply values decl-attr)))
; Run some tests on the content of the attribute
(cond
((eq? use-type 'FIXED)
(or (equal? (cdr attr) default-value)
(parser-error port "[FixedAttr] broken for " attr-name)))
((eq? content-type 'CDATA) #t) ; everything goes
((pair? content-type)
(or (member (cdr attr) content-type)
(parser-error port "[enum] broken for " attr-name "="
(cdr attr))))
(else
(ssax:warn port "declared content type " content-type
" not verified yet")))
(loop attr-others other-decls (cons attr result)))))
))))
; Add a new namespace declaration to namespaces.
; First we convert the uri-str to a uri-symbol and search namespaces for
; an association (_ user-prefix . uri-symbol).
; If found, we return the argument namespaces with an association
; (prefix user-prefix . uri-symbol) prepended.
; Otherwise, we prepend (prefix uri-symbol . uri-symbol)
(define (add-ns port prefix uri-str namespaces)
(and (equal? "" uri-str)
(parser-error port "[dt-NSName] broken for " prefix))
(let ((uri-symbol (ssax:uri-string->symbol uri-str)))
(let loop ((nss namespaces))
(cond
((null? nss)
(cons (cons* prefix uri-symbol uri-symbol) namespaces))
((eq? uri-symbol (cddar nss))
(cons (cons* prefix (cadar nss) uri-symbol) namespaces))
(else (loop (cdr nss)))))))
; partition attrs into proper attrs and new namespace declarations
; return two values: proper attrs and the updated namespace declarations
(define (adjust-namespace-decl port attrs namespaces)
(let loop ((attrs attrs) (proper-attrs '()) (namespaces namespaces))
(cond
((null? attrs) (values proper-attrs namespaces))
((eq? xmlns (caar attrs)) ; re-decl of the default namespace
(loop (cdr attrs) proper-attrs
(if (equal? "" (cdar attrs)) ; un-decl of the default ns
(cons (cons* '*DEFAULT* #f #f) namespaces)
(add-ns port '*DEFAULT* (cdar attrs) namespaces))))
((and (pair? (caar attrs)) (eq? xmlns (caaar attrs)))
(loop (cdr attrs) proper-attrs
(add-ns port (cdaar attrs) (cdar attrs) namespaces)))
(else
(loop (cdr attrs) (cons (car attrs) proper-attrs) namespaces)))))
; The body of the function
(lambda (tag-head port elems entities namespaces)
(let*-values
(((attlist) (ssax:read-attributes port entities))
((empty-el-tag?)
(begin
(ssax:skip-S port)
(and
(eqv? #\/
(assert-curr-char '(#\> #\/) "XML [40], XML [44], no '>'" port))
(assert-curr-char '(#\>) "XML [44], no '>'" port))))
((elem-content decl-attrs) ; see xml-decl for their type
(if elems ; elements declared: validate!
(cond
((assoc tag-head elems) =>
(lambda (decl-elem) ; of type xml-decl::decl-elem
(values
(if empty-el-tag? 'EMPTY-TAG (cadr decl-elem))
(caddr decl-elem))))
(else
(parser-error port "[elementvalid] broken, no decl for " tag-head)))
(values ; non-validating parsing
(if empty-el-tag? 'EMPTY-TAG 'ANY)
#f) ; no attributes declared
))
((merged-attrs) (if decl-attrs (validate-attrs port attlist decl-attrs)
(attlist->alist attlist)))
((proper-attrs namespaces)
(adjust-namespace-decl port merged-attrs namespaces))
)
;(cerr "proper attrs: " proper-attrs nl)
; build the return value
(values
(ssax:resolve-name port tag-head namespaces #t)
(fold-right
(lambda (name-value attlist)
(or
(attlist-add attlist
(cons (ssax:resolve-name port (car name-value) namespaces #f)
(cdr name-value)))
(parser-error port "[uniqattspec] after NS expansion broken for "
name-value)))
(make-empty-attlist)
proper-attrs)
namespaces
elem-content)))))
(run-test
(let* ((urn-a (string->symbol "urn:a"))
(urn-b (string->symbol "urn:b"))
(urn-html (string->symbol "http://w3c.org/html"))
(namespaces
`((#f '"UHTML" . ,urn-html)
('"A" '"UA" . ,urn-a)))
(test
(lambda (tag-head-name elems str)
(call-with-input-string str
(lambda (port)
(call-with-values
(lambda ()
(ssax:complete-start-tag
(call-with-input-string tag-head-name
(lambda (port) (ssax:read-QName port)))
port
elems '() namespaces))
list))))))
; First test with no validation of elements
;(test "TAG1" #f "")
(assert (equal? `('"TAG1" () ,namespaces ANY)
(test "TAG1" #f ">")))
(assert (equal? `('"TAG1" () ,namespaces EMPTY-TAG)
(test "TAG1" #f "/>")))
(assert (equal? `('"TAG1" (('"HREF" . "a")) ,namespaces EMPTY-TAG)
(test "TAG1" #f "HREF='a'/>")))
(assert (equal? `(('"UA" . '"TAG1") (('"HREF" . "a"))
,(cons `(*DEFAULT* '"UA" . ,urn-a) namespaces) ANY)
(test "TAG1" #f "HREF='a' xmlns='urn:a'>")))
(assert (equal? `('"TAG1" (('"HREF" . "a"))
,(cons '(*DEFAULT* #f . #f) namespaces) ANY)
(test "TAG1" #f "HREF='a' xmlns=''>")))
(assert (failed? (test "UA:TAG1" #f "HREF='a' xmlns=''/>")))
(assert (equal? `(('"UA" . '"TAG1") ((('"UA" . '"HREF") . "a"))
,(cons '(*DEFAULT* #f . #f) namespaces) ANY)
(test "A:TAG1" #f "A:HREF='a' xmlns=''>")))
(assert (equal? `(('"UA" . '"TAG1") ((('"UA" . '"HREF") . "a"))
,(cons `(*DEFAULT* ,urn-b . ,urn-b) namespaces) ANY)
(test "A:TAG1" #f "A:HREF='a' xmlns='urn:b'>")))
(assert (failed? (test "B:TAG1" #f "A:HREF='a' xmlns:b=''/>")))
(assert (equal? `((,urn-b . '"TAG1") ((('"UA" . '"HREF") . "a"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) ANY)
(test "B:TAG1" #f "A:HREF='a' xmlns:B='urn:b'>")))
(assert (equal? `((,urn-b . '"TAG1") ((('"UA" . '"HREF") . "a")
((,urn-b . '"SRC") . "b"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) ANY)
(test "B:TAG1" #f
"B:SRC='b' A:HREF='a' xmlns:B='urn:b'>")))
(assert (equal? `((,urn-b . '"TAG1") ((('"UA" . '"HREF") . "a")
((,urn-b . '"HREF") . "b"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) ANY)
(test "B:TAG1" #f
"B:HREF=\"b\" A:HREF='a' xmlns:B='urn:b'>")))
; must be an error! Duplicate attr
(assert (failed? (test "B:TAG1" #f
"HREF=\"b\" HREF='a' xmlns:B='urn:a'/>")))
; must be an error! Duplicate attr after ns expansion
(assert (failed? (test "B:TAG1" #f
"B:HREF=\"b\" A:HREF='a' xmlns:B='urn:a'/>")))
(assert (equal? `(('"UA" . '"TAG1") (('"HREF" . "a")
(('"UA" . '"HREF") . "b"))
,(cons `(*DEFAULT* '"UA" . ,urn-a) namespaces) ANY)
(test "TAG1" #f
"A:HREF=\"b\" HREF='a' xmlns='urn:a'>")))
(assert (equal? `('"TAG1" ((('"UHTML" . '"HREF") . "a")
((,urn-b . '"HREF") . "b"))
,(append `(
('"HTML" '"UHTML" . ,urn-html)
('"B" ,urn-b . ,urn-b))
namespaces) ANY)
(test "TAG1" #f
"B:HREF=\"b\" xmlns:B='urn:b' xmlns:HTML='http://w3c.org/html' HTML:HREF='a' >")))
; Now test the validating parsing
; No decl for tag1
(assert (failed? (test "TAG1" '((TAG2 ANY ()))
"B:HREF='b' xmlns:B='urn:b'>")))
; No decl for HREF elem
;; (cond-expand
;; ((not (or scm mit-scheme)) ; Regretfully, SCM treats '() as #f
;; (assert (failed?
;; (test "TAG1" '(('"TAG1" ANY ()))
;; "B:HREF='b' xmlns:B='urn:b'>"))))
;; (else #t))
; No decl for HREF elem
(assert (failed?
(test "TAG1" '(('"TAG1" ANY (('"HREF1" CDATA IMPLIED #f))))
"B:HREF='b' xmlns:B='urn:b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces EMPTY-TAG)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f))))
"HREF='b'/>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f))))
"HREF='b'>")))
; Req'd attribute not given error
(assert (failed?
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f))))
">")))
; Wrong content-type of the attribute
(assert (failed?
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" ("c") REQUIRED #f))))
"HREF='b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" ("c" "b") IMPLIED #f))))
"HREF='b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA IMPLIED "c"))))
"HREF='b'>")))
; Bad fixed attribute
(assert (failed?
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA FIXED "c"))))
"HREF='b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA FIXED "b"))))
"HREF='b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA FIXED "b")))) ">")))
(assert (equal? `('"TAG1" (('"HREF" . "b")) ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA IMPLIED "b")))) ">")))
(assert (equal? `('"TAG1" () ,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA IMPLIED #f)))) ">")))
; Undeclared attr
(assert (failed?
(test "TAG1"
'(('"TAG1" PCDATA ((('"A" . '"HREF") CDATA IMPLIED "c"))))
"HREF='b'>")))
(assert (equal? `('"TAG1" (('"HREF" . "b") (('"UA" . '"HREF") . "c"))
,namespaces PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f)
(('"A" . '"HREF") CDATA IMPLIED "c"))))
"HREF='b'>")))
(assert (equal? `(('"UA" . '"TAG1")
(('"HREF" . "b") (('"UA" . '"HREF") . "c"))
,namespaces PCDATA)
(test "A:TAG1" '((('"A" . '"TAG1") PCDATA
(('"HREF" NMTOKEN REQUIRED #f)
(('"A" . '"HREF") CDATA IMPLIED "c"))))
"HREF='b'>")))
(assert (equal? `((,urn-b . '"TAG1") (('"HREF" . "b"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) PCDATA)
(test "B:TAG1" '((('"B" . '"TAG1") PCDATA (('"HREF" CDATA REQUIRED #f)
(('"xmlns" . '"B") CDATA IMPLIED "urn:b"))))
"HREF='b'>")))
(assert (equal? `((,urn-b . '"TAG1") (((,urn-b . '"HREF") . "b"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) PCDATA)
(test "B:TAG1" '((('"B" . '"TAG1") PCDATA
((('"B" . '"HREF") CDATA REQUIRED #f)
(('"xmlns" . '"B") CDATA IMPLIED "urn:b"))))
"B:HREF='b'>")))
(assert (equal? `((,urn-b . '"TAG1") (('"HREF" . "b"))
,(cons `(*DEFAULT* ,urn-b . ,urn-b) namespaces) PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f)
('"xmlns" CDATA IMPLIED "urn:b"))))
"HREF='b'>")))
; xmlns not declared
(assert (equal? `((,urn-b . '"TAG1") (('"HREF" . "b"))
,(cons `(*DEFAULT* ,urn-b . ,urn-b) namespaces) PCDATA)
(test "TAG1" '(('"TAG1" PCDATA (('"HREF" CDATA REQUIRED #f)
)))
"HREF='b' xmlns='urn:b'>")))
; xmlns:B not declared
(assert (equal? `((,urn-b . '"TAG1") (((,urn-b . '"HREF") . "b"))
,(cons `('"B" ,urn-b . ,urn-b) namespaces) PCDATA)
(test "B:TAG1" '((('"B" . '"TAG1") PCDATA
((('"B" . '"HREF") CDATA REQUIRED #f)
)))
"B:HREF='b' xmlns:B='urn:b'>")))
))
; procedure+: ssax:read-external-id PORT
;
; This procedure parses an ExternalID production:
; [75] ExternalID ::= 'SYSTEM' S SystemLiteral
; | 'PUBLIC' S PubidLiteral S SystemLiteral
; [11] SystemLiteral ::= ('"' [^"]* '"') | ("'" [^']* "'")
; [12] PubidLiteral ::= '"' PubidChar* '"' | "'" (PubidChar - "'")* "'"
; [13] PubidChar ::= #x20 | #xD | #xA | [a-zA-Z0-9]
; | [-'()+,./:=?;!*#@$_%]
;
; This procedure is supposed to be called when an ExternalID is expected;
; that is, the current character must be either #\S or #\P that start
; correspondingly a SYSTEM or PUBLIC token. This procedure returns the
; SystemLiteral as a string. A PubidLiteral is disregarded if present.
(define (ssax:read-external-id port)
(let ((discriminator (ssax:read-NCName port)))
(assert-curr-char ssax:S-chars "space after SYSTEM or PUBLIC" port)
(ssax:skip-S port)
(let ((delimiter
(assert-curr-char '(#\' #\" ) "XML [11], XML [12]" port)))
(cond
((eq? discriminator (string->symbol "SYSTEM"))
(begin0
(next-token '() (list delimiter) "XML [11]" port)
(read-char port) ; reading the closing delim
))
((eq? discriminator (string->symbol "PUBLIC"))
(skip-until (list delimiter) port)
(assert-curr-char ssax:S-chars "space after PubidLiteral" port)
(ssax:skip-S port)
(let* ((delimiter
(assert-curr-char '(#\' #\" ) "XML [11]" port))
(systemid
(next-token '() (list delimiter) "XML [11]" port)))
(read-char port) ; reading the closing delim
systemid))
(else
(parser-error port "XML [75], " discriminator
" rather than SYSTEM or PUBLIC"))))))
;-----------------------------------------------------------------------------
; Higher-level parsers and scanners
;
; They parse productions corresponding to the whole (document) entity
; or its higher-level pieces (prolog, root element, etc).
; Scan the Misc production in the context
; [1] document ::= prolog element Misc*
; [22] prolog ::= XMLDecl? Misc* (doctypedec l Misc*)?
; [27] Misc ::= Comment | PI | S
;
; The following function should be called in the prolog or epilog contexts.
; In these contexts, whitespaces are completely ignored.
; The return value from ssax:scan-Misc is either a PI-token,
; a DECL-token, a START token, or EOF.
; Comments are ignored and not reported.
(define (ssax:scan-Misc port)
(let loop ((c (ssax:skip-S port)))
(cond
((eof-object? c) c)
((not (char=? c #\<))
(parser-error port "XML [22], char '" c "' unexpected"))
(else
(let ((token (ssax:read-markup-token port)))
(case (xml-token-kind token)
((COMMENT) (loop (ssax:skip-S port)))
((PI DECL START) token)
(else
(parser-error port "XML [22], unexpected token of kind "
(xml-token-kind token)
))))))))
; procedure+: ssax:read-char-data PORT EXPECT-EOF? STR-HANDLER SEED
;
; This procedure is to read the character content of an XML document
; or an XML element.
; [43] content ::=
; (element | CharData | Reference | CDSect | PI
; | Comment)*
; To be more precise, the procedure reads CharData, expands CDSect
; and character entities, and skips comments. The procedure stops
; at a named reference, EOF, at the beginning of a PI or a start/end tag.
;
; port
; a PORT to read
; expect-eof?
; a boolean indicating if EOF is normal, i.e., the character
; data may be terminated by the EOF. EOF is normal
; while processing a parsed entity.
; str-handler
; a STR-HANDLER
; seed
; an argument passed to the first invocation of STR-HANDLER.
;
; The procedure returns two results: SEED and TOKEN.
; The SEED is the result of the last invocation of STR-HANDLER, or the
; original seed if STR-HANDLER was never called.
;
; TOKEN can be either an eof-object (this can happen only if
; expect-eof? was #t), or:
; - an xml-token describing a START tag or an END-tag;
; For a start token, the caller has to finish reading it.
; - an xml-token describing the beginning of a PI. It's up to an
; application to read or skip through the rest of this PI;
; - an xml-token describing a named entity reference.
;
; CDATA sections and character references are expanded inline and
; never returned. Comments are silently disregarded.
;
; As the XML Recommendation requires, all whitespace in character data
; must be preserved. However, a CR character (#xD) must be disregarded
; if it appears before a LF character (#xA), or replaced by a #xA character
; otherwise. See Secs. 2.10 and 2.11 of the XML Recommendation. See also
; the canonical XML Recommendation.
; ssax:read-char-data port expect-eof? str-handler seed
(define ssax:read-char-data
(let
((terminators-usual (list #\< #\& char-return))
(terminators-usual-eof (list #\< '*eof* #\& char-return))
(handle-fragment
(lambda (fragment str-handler seed)
(if (string-null? fragment) seed
(str-handler fragment "" seed))))
)
(lambda (port expect-eof? str-handler seed)
; Very often, the first character we encounter is #\<
; Therefore, we handle this case in a special, fast path
(if (eqv? #\< (peek-char port))
; The fast path
(let ((token (ssax:read-markup-token port)))
(case (xml-token-kind token)
((START END) ; The most common case
(values seed token))
((CDSECT)
(let ((seed (ssax:read-cdata-body port str-handler seed)))
(ssax:read-char-data port expect-eof? str-handler seed)))
((COMMENT) (ssax:read-char-data port expect-eof?
str-handler seed))
(else
(values seed token))))
; The slow path
(let ((char-data-terminators
(if expect-eof? terminators-usual-eof terminators-usual)))
(let loop ((seed seed))
(let* ((fragment
(next-token '() char-data-terminators
"reading char data" port))
(term-char (peek-char port)) ; one of char-data-terminators
)
(if (eof-object? term-char)
(values
(handle-fragment fragment str-handler seed)
term-char)
(case term-char
((#\<)
(let ((token (ssax:read-markup-token port)))
(case (xml-token-kind token)
((CDSECT)
(loop
(ssax:read-cdata-body port str-handler
(handle-fragment fragment str-handler seed))))
((COMMENT)
(loop (handle-fragment fragment str-handler seed)))
(else
(values
(handle-fragment fragment str-handler seed)
token)))))
((#\&)
(case (peek-next-char port)
((#\#) (read-char port)
(loop (str-handler fragment
(ssax:read-char-ref port)
seed)))
(else
(let ((name (ssax:read-NCName port)))
(assert-curr-char '(#\;) "XML [68]" port)
(values
(handle-fragment fragment str-handler seed)
(make-xml-token 'ENTITY-REF name))))))
(else ; This must be a CR character
(if (eqv? (peek-next-char port) #\newline)
(read-char port))
(loop (str-handler fragment (string #\newline) seed))))
))))))))
; a few lines of validation code
(run-test (letrec
((a-tag (make-xml-token 'START (string->symbol "BR")))
(a-ref (make-xml-token 'ENTITY-REF (string->symbol "lt")))
(eof-object (lambda () eof-object)) ; a unique value
(str-handler (lambda (fragment foll-fragment seed)
(if (string-null? foll-fragment) (cons fragment seed)
(cons* foll-fragment fragment seed))))
(test (lambda (str expect-eof? expected-data expected-token)
(newline) (display "body: ") (write str)
(newline) (display "Result: ")
(let*-values
(((seed token)
(call-with-input-string (unesc-string str)
(lambda (port)
(ssax:read-char-data port expect-eof? str-handler '()))))
((result) (reverse seed)))
(write result)
(display " ")
(display token)
(assert (equal? result (map unesc-string expected-data))
(if (eq? expected-token eof-object)
(eof-object? token)
(equal? token expected-token))))))
)
(test "" #t '() eof-object)
(assert (failed? (test "" #f '() eof-object)))
(test " " #t '(" ") eof-object)
(test "<BR/>" #f '() a-tag)
(test " <BR />" #f '(" ") a-tag)
(test " &lt;" #f '(" ") a-ref)
(test " a&lt;" #f '(" a") a-ref)
(test " a &lt;" #f '(" a ") a-ref)
(test " <!-- comment--> a a<BR/>" #f '(" " " a a") a-tag)
(test " <!-- comment-->%ra a<BR/>" #f '(" " "" "%n" "a a") a-tag)
(test " <!-- comment-->%r%na a<BR/>" #f '(" " "" "%n" "a a") a-tag)
(test " <!-- comment-->%r%na%t%r%r%na<BR/>" #f
'(" " "" "%n" "a%t" "%n" "" "%n" "a") a-tag)
(test "a<!-- comment--> a a<BR/>" #f '("a" " a a") a-tag)
(test "&#x21;<BR/>" #f '("" "!") a-tag)
(test "&#x21;%n<BR/>" #f '("" "!" "%n") a-tag)
(test "%t&#x21;%n<BR/>" #f '("%t" "!" "%n") a-tag)
(test "%t&#x21;%na a<BR/>" #f '("%t" "!" "%na a") a-tag)
(test "%t&#x21;%ra a<BR/>" #f '("%t" "!" "" "%n" "a a") a-tag)
(test "%t&#x21;%r%na a<BR/>" #f '("%t" "!" "" "%n" "a a") a-tag)
(test " %ta &#x21; b <BR/>" #f '(" %ta " "!" " b ") a-tag)
(test " %ta &#x20; b <BR/>" #f '(" %ta " " " " b ") a-tag)
(test "<![CDATA[<]]><BR/>" #f '("<") a-tag)
(test "<![CDATA[]]]><BR/>" #f '("]") a-tag)
(test "%t<![CDATA[<]]><BR/>" #f '("%t" "<") a-tag)
(test "%t<![CDATA[<]]>a b<BR/>" #f '("%t" "<" "a b") a-tag)
(test "%t<![CDATA[<]]> a b<BR/>" #f '("%t" "<" " a b") a-tag)
(test "%td <![CDATA[ <%r%r%n]]> a b<BR/>" #f
'("%td " " <" "%n" "" "%n" " a b") a-tag)
))
; procedure+: ssax:assert-token TOKEN KIND GI
; Make sure that TOKEN is of anticipated KIND and has anticipated GI
; Note GI argument may actually be a pair of two symbols, Namespace
; URI or the prefix, and of the localname.
; If the assertion fails, error-cont is evaluated by passing it
; three arguments: token kind gi. The result of error-cont is returned.
(define (ssax:assert-token token kind gi error-cont)
(or
(and (xml-token? token)
(eq? kind (xml-token-kind token))
(equal? gi (xml-token-head token)))
(error-cont token kind gi)))
;========================================================================
; Highest-level parsers: XML to SXML
; These parsers are a set of syntactic forms to instantiate a SSAX parser.
; A user can instantiate the parser to do the full validation, or
; no validation, or any particular validation. The user specifies
; which PI he wants to be notified about. The user tells what to do
; with the parsed character and element data. The latter handlers
; determine if the parsing follows a SAX or a DOM model.
; syntax: ssax:make-pi-parser my-pi-handlers
; Create a parser to parse and process one Processing Element (PI).
; my-pi-handlers
; An assoc list of pairs (PI-TAG . PI-HANDLER)
; where PI-TAG is an NCName symbol, the PI target, and
; PI-HANDLER is a procedure PORT PI-TAG SEED
; where PORT points to the first symbol after the PI target.
; The handler should read the rest of the PI up to and including
; the combination '?>' that terminates the PI. The handler should
; return a new seed.
; One of the PI-TAGs may be the symbol *DEFAULT*. The corresponding
; handler will handle PIs that no other handler will. If the
; *DEFAULT* PI-TAG is not specified, ssax:make-pi-parser will assume
; the default handler that skips the body of the PI
;
; The output of the ssax:make-pi-parser is a procedure
; PORT PI-TAG SEED
; that will parse the current PI according to the user-specified handlers.
;
; The previous version of ssax:make-pi-parser was a low-level macro:
; (define-macro ssax:make-pi-parser
; (lambda (my-pi-handlers)
; `(lambda (port target seed)
; (case target
; ; Generate the body of the case statement
; ,@(let loop ((pi-handlers my-pi-handlers) (default #f))
; (cond
; ((null? pi-handlers)
; (if default `((else (,default port target seed)))
; '((else
; (ssax:warn port "Skipping PI: " target nl)
; (ssax:skip-pi port)
; seed))))
; ((eq? '*DEFAULT* (caar pi-handlers))
; (loop (cdr pi-handlers) (cdar pi-handlers)))
; (else
; (cons
; `((,(caar pi-handlers)) (,(cdar pi-handlers) port target seed))
; (loop (cdr pi-handlers) default)))))))))
(define-syntax ssax:make-pi-parser
(syntax-rules ()
((ssax:make-pi-parser orig-handlers)
(letrec-syntax
; Generate the clauses of the case statement
((loop
(syntax-rules (*DEFAULT*)
((loop () #f accum port target seed) ; no default
(make-case
((else
(ssax:warn port "Skipping PI: " target nl)
(ssax:skip-pi port)
seed)
. accum)
() target))
((loop () default accum port target seed)
(make-case
((else (default port target seed)) . accum)
() target))
((loop ((*DEFAULT* . default) . handlers) old-def accum
port target seed)
(loop handlers default accum port target seed))
((loop ((tag . handler) . handlers) default accum port target seed)
(loop handlers default
(((tag) (handler port target seed)) . accum)
port target seed))
))
(make-case ; Reverse the clauses, make the 'case'
(syntax-rules ()
((make-case () clauses target)
(case target . clauses))
((make-case (clause . clauses) accum target)
(make-case clauses (clause . accum) target)))
))
(lambda (port target seed)
(loop orig-handlers #f () port target seed))
))))
(run-test
(pp (ssax:make-pi-parser ()))
(pp (ssax:make-pi-parser ((xml . (lambda (port target seed) seed)))))
(pp (ssax:make-pi-parser ((xml . (lambda (port target seed) seed))
(html . list)
(*DEFAULT* . ssax:warn))))
)
; syntax: ssax:make-elem-parser my-new-level-seed my-finish-element
; my-char-data-handler my-pi-handlers
; Create a parser to parse and process one element, including its
; character content or children elements. The parser is typically
; applied to the root element of a document.
; my-new-level-seed
; procedure ELEM-GI ATTRIBUTES NAMESPACES EXPECTED-CONTENT SEED
; where ELEM-GI is a RES-NAME of the element
; about to be processed.
; This procedure is to generate the seed to be passed
; to handlers that process the content of the element.
; This is the function identified as 'fdown' in the denotational
; semantics of the XML parser given in the title comments to this
; file.
;
; my-finish-element
; procedure ELEM-GI ATTRIBUTES NAMESPACES PARENT-SEED SEED
; This procedure is called when parsing of ELEM-GI is finished.
; The SEED is the result from the last content parser (or
; from my-new-level-seed if the element has the empty content).
; PARENT-SEED is the same seed as was passed to my-new-level-seed.
; The procedure is to generate a seed that will be the result
; of the element parser.
; This is the function identified as 'fup' in the denotational
; semantics of the XML parser given in the title comments to this
; file.
;
; my-char-data-handler
; A STR-HANDLER
;
; my-pi-handlers
; See ssax:make-pi-handler above
;
; The generated parser is a
; procedure START-TAG-HEAD PORT ELEMS ENTITIES
; NAMESPACES PRESERVE-WS? SEED
; The procedure must be called after the start tag token has been
; read. START-TAG-HEAD is an UNRES-NAME from the start-element tag.
; ELEMS is an instance of xml-decl::elems.
; See ssax:complete-start-tag::preserve-ws?
; Faults detected:
; VC: XML-Spec.html#elementvalid
; WFC: XML-Spec.html#GIMatch
(define-syntax ssax:make-elem-parser
(syntax-rules ()
((ssax:make-elem-parser my-new-level-seed my-finish-element
my-char-data-handler my-pi-handlers)
(lambda (start-tag-head port elems entities namespaces
preserve-ws? seed)
(define xml-space-gi (cons ssax:Prefix-XML
(string->symbol "space")))
(let handle-start-tag ((start-tag-head start-tag-head)
(port port) (entities entities)
(namespaces namespaces)
(preserve-ws? preserve-ws?) (parent-seed seed))
(let*-values
(((elem-gi attributes namespaces expected-content)
(ssax:complete-start-tag start-tag-head port elems
entities namespaces))
((seed)
(my-new-level-seed elem-gi attributes
namespaces expected-content parent-seed)))
(case expected-content
((EMPTY-TAG)
(my-finish-element
elem-gi attributes namespaces parent-seed seed))
((EMPTY) ; The end tag must immediately follow
(ssax:assert-token
(and (eqv? #\< (ssax:skip-S port)) (ssax:read-markup-token port))
'END start-tag-head
(lambda (token exp-kind exp-head)
(parser-error port "[elementvalid] broken for " token
" while expecting "
exp-kind exp-head)))
(my-finish-element
elem-gi attributes namespaces parent-seed seed))
(else ; reading the content...
(let ((preserve-ws? ; inherit or set the preserve-ws? flag
(cond
((assoc xml-space-gi attributes) =>
(lambda (name-value)
(equal? "preserve" (cdr name-value))))
(else preserve-ws?))))
(let loop ((port port) (entities entities)
(expect-eof? #f) (seed seed))
(let*-values
(((seed term-token)
(ssax:read-char-data port expect-eof?
my-char-data-handler seed)))
(if (eof-object? term-token)
seed
(case (xml-token-kind term-token)
((END)
(ssax:assert-token term-token 'END start-tag-head
(lambda (token exp-kind exp-head)
(parser-error port "[GIMatch] broken for "
term-token " while expecting "
exp-kind exp-head)))
(my-finish-element
elem-gi attributes namespaces parent-seed seed))
((PI)
(let ((seed
((ssax:make-pi-parser my-pi-handlers)
port (xml-token-head term-token) seed)))
(loop port entities expect-eof? seed)))
((ENTITY-REF)
(let ((seed
(ssax:handle-parsed-entity
port (xml-token-head term-token)
entities
(lambda (port entities seed)
(loop port entities #t seed))
my-char-data-handler
seed))) ; keep on reading the content after ent
(loop port entities expect-eof? seed)))
((START) ; Start of a child element
(if (eq? expected-content 'PCDATA)
(parser-error port "[elementvalid] broken for "
elem-gi
" with char content only; unexpected token "
term-token))
; Do other validation of the element content
(let ((seed
(handle-start-tag
(xml-token-head term-token)
port entities namespaces
preserve-ws? seed)))
(loop port entities expect-eof? seed)))
(else
(parser-error port "XML [43] broken for "
term-token))))))))
)))
))))
; syntax: ssax:make-parser user-handler-tag user-handler-proc ...
;
; Create an XML parser, an instance of the XML parsing framework.
; This will be a SAX, a DOM, or a specialized parser depending
; on the supplied user-handlers.
; user-handler-tag is a symbol that identifies a procedural expression
; that follows the tag. Given below are tags and signatures of the
; corresponding procedures. Not all tags have to be specified. If some
; are omitted, reasonable defaults will apply.
;
; tag: DOCTYPE
; handler-procedure: PORT DOCNAME SYSTEMID INTERNAL-SUBSET? SEED
; If internal-subset? is #t, the current position in the port
; is right after we have read #\[ that begins the internal DTD subset.
; We must finish reading of this subset before we return
; (or must call skip-internal-subset if we aren't interested in reading it).
; The port at exit must be at the first symbol after the whole
; DOCTYPE declaration.
; The handler-procedure must generate four values:
; ELEMS ENTITIES NAMESPACES SEED
; See xml-decl::elems for ELEMS. It may be #f to switch off the validation.
; NAMESPACES will typically contain USER-PREFIXes for selected URI-SYMBs.
; The default handler-procedure skips the internal subset,
; if any, and returns (values #f '() '() seed)
; tag: UNDECL-ROOT
; handler-procedure: ELEM-GI SEED
; where ELEM-GI is an UNRES-NAME of the root element. This procedure
; is called when an XML document under parsing contains _no_ DOCTYPE
; declaration.
; The handler-procedure, as a DOCTYPE handler procedure above,
; must generate four values:
; ELEMS ENTITIES NAMESPACES SEED
; The default handler-procedure returns (values #f '() '() seed)
; tag: DECL-ROOT
; handler-procedure: ELEM-GI SEED
; where ELEM-GI is an UNRES-NAME of the root element. This procedure
; is called when an XML document under parsing does contains the DOCTYPE
; declaration.
; The handler-procedure must generate a new SEED (and verify
; that the name of the root element matches the doctype, if the handler
; so wishes).
; The default handler-procedure is the identity function.
; tag: NEW-LEVEL-SEED
; handler-procedure: see ssax:make-elem-parser, my-new-level-seed
; tag: FINISH-ELEMENT
; handler-procedure: see ssax:make-elem-parser, my-finish-element
; tag: CHAR-DATA-HANDLER
; handler-procedure: see ssax:make-elem-parser, my-char-data-handler
; tag: PI
; handler-procedure: see ssax:make-pi-parser
; The default value is '()
; The generated parser is a
; procedure PORT SEED
; This procedure parses the document prolog and then exits to
; an element parser (created by ssax:make-elem-parser) to handle
; the rest.
;
; [1] document ::= prolog element Misc*
; [22] prolog ::= XMLDecl? Misc* (doctypedec | Misc*)?
; [27] Misc ::= Comment | PI | S
;
; [28] doctypedecl ::= '<!DOCTYPE' S Name (S ExternalID)? S?
; ('[' (markupdecl | PEReference | S)* ']' S?)? '>'
; [29] markupdecl ::= elementdecl | AttlistDecl
; | EntityDecl
; | NotationDecl | PI
; | Comment
;
; This is ssax:make-parser with all the (specialization) handlers given
; as positional arguments. It is called by ssax:make-parser, see below
(define-syntax ssax:make-parser/positional-args
(syntax-rules ()
((ssax:make-parser/positional-args
*handler-DOCTYPE
*handler-UNDECL-ROOT
*handler-DECL-ROOT
*handler-NEW-LEVEL-SEED
*handler-FINISH-ELEMENT
*handler-CHAR-DATA-HANDLER
*handler-PI)
(lambda (port seed)
; We must've just scanned the DOCTYPE token
; Handle the doctype declaration and exit to
; scan-for-significant-prolog-token-2, and eventually, to the
; element parser.
(define (handle-decl port token-head seed)
(or (eq? (string->symbol "DOCTYPE") token-head)
(parser-error port "XML [22], expected DOCTYPE declaration, found "
token-head))
(assert-curr-char ssax:S-chars "XML [28], space after DOCTYPE" port)
(ssax:skip-S port)
(let*-values
(((docname) (ssax:read-QName port))
((systemid)
(and (ssax:ncname-starting-char? (ssax:skip-S port))
(ssax:read-external-id port)))
((internal-subset?)
(begin (ssax:skip-S port)
(eqv? #\[ (assert-curr-char '(#\> #\[)
"XML [28], end-of-DOCTYPE" port))))
((elems entities namespaces seed)
(*handler-DOCTYPE port docname systemid
internal-subset? seed))
)
(scan-for-significant-prolog-token-2 port elems entities namespaces
seed)))
; Scan the leading PIs until we encounter either a doctype declaration
; or a start token (of the root element)
; In the latter two cases, we exit to the appropriate continuation
(define (scan-for-significant-prolog-token-1 port seed)
(let ((token (ssax:scan-Misc port)))
(if (eof-object? token)
(parser-error port "XML [22], unexpected EOF")
(case (xml-token-kind token)
((PI)
(let ((seed
((ssax:make-pi-parser *handler-PI)
port (xml-token-head token) seed)))
(scan-for-significant-prolog-token-1 port seed)))
((DECL) (handle-decl port (xml-token-head token) seed))
((START)
(let*-values
(((elems entities namespaces seed)
(*handler-UNDECL-ROOT (xml-token-head token) seed)))
(element-parser (xml-token-head token) port elems
entities namespaces #f seed)))
(else (parser-error port "XML [22], unexpected markup "
token))))))
; Scan PIs after the doctype declaration, till we encounter
; the start tag of the root element. After that we exit
; to the element parser
(define (scan-for-significant-prolog-token-2 port elems entities
namespaces seed)
(let ((token (ssax:scan-Misc port)))
(if (eof-object? token)
(parser-error port "XML [22], unexpected EOF")
(case (xml-token-kind token)
((PI)
(let ((seed
((ssax:make-pi-parser *handler-PI)
port (xml-token-head token) seed)))
(scan-for-significant-prolog-token-2 port elems entities
namespaces seed)))
((START)
(element-parser (xml-token-head token) port elems
entities namespaces #f
(*handler-DECL-ROOT (xml-token-head token) seed)))
(else (parser-error port "XML [22], unexpected markup "
token))))))
; A procedure start-tag-head port elems entities namespaces
; preserve-ws? seed
(define element-parser
(ssax:make-elem-parser *handler-NEW-LEVEL-SEED
*handler-FINISH-ELEMENT
*handler-CHAR-DATA-HANDLER
*handler-PI))
; Get the ball rolling ...
(scan-for-significant-prolog-token-1 port seed)
))))
; The following meta-macro turns a regular macro (with positional
; arguments) into a form with keyword (labeled) arguments. We later
; use the meta-macro to convert ssax:make-parser/positional-args into
; ssax:make-parser. The latter provides a prettier (with labeled
; arguments and defaults) interface to
; ssax:make-parser/positional-args
;
; ssax:define-labeled-arg-macro LABELED-ARG-MACRO-NAME
; (POS-MACRO-NAME ARG-DESCRIPTOR ...)
; expands into the definition of a macro
; LABELED-ARG-MACRO-NAME KW-NAME KW-VALUE KW-NAME1 KW-VALUE1 ...
; which, in turn, expands into
; POS-MACRO-NAME ARG1 ARG2 ...
; where each ARG1 etc. comes either from KW-VALUE or from
; the deafult part of ARG-DESCRIPTOR. ARG1 corresponds to the first
; ARG-DESCRIPTOR, ARG2 corresponds to the second descriptor, etc.
; Here ARG-DESCRIPTOR describes one argument of the positional macro.
; It has the form
; (ARG-NAME DEFAULT-VALUE)
; or
; (ARG-NAME)
; In the latter form, the default value is not given, so that the invocation of
; LABELED-ARG-MACRO-NAME must mention the corresponding parameter.
; ARG-NAME can be anything: an identifier, a string, or even a number.
(define-syntax ssax:define-labeled-arg-macro
(syntax-rules ()
((ssax:define-labeled-arg-macro
labeled-arg-macro-name
(positional-macro-name
(arg-name . arg-def) ...))
(define-syntax labeled-arg-macro-name
(syntax-rules ()
((labeled-arg-macro-name . kw-val-pairs)
(letrec-syntax
((find
(syntax-rules (arg-name ...)
((find k-args (arg-name . default) arg-name
val . others) ; found arg-name among kw-val-pairs
(next val . k-args)) ...
((find k-args key arg-no-match-name val . others)
(find k-args key . others))
((find k-args (arg-name default)) ; default must be here
(next default . k-args)) ...
))
(next ; pack the continuation to find
(syntax-rules ()
((next val vals key . keys)
(find ((val . vals) . keys) key . kw-val-pairs))
((next val vals) ; processed all arg-descriptors
(rev-apply (val) vals))))
(rev-apply
(syntax-rules ()
((rev-apply form (x . xs))
(rev-apply (x . form) xs))
((rev-apply form ()) form))))
(next positional-macro-name ()
(arg-name . arg-def) ...))))))))
; The definition of ssax:make-parser
(ssax:define-labeled-arg-macro ssax:make-parser
(ssax:make-parser/positional-args
(DOCTYPE
(lambda (port docname systemid internal-subset? seed)
(when internal-subset?
(ssax:warn port "Internal DTD subset is not currently handled ")
(ssax:skip-internal-dtd port))
(ssax:warn port "DOCTYPE DECL " docname " "
systemid " found and skipped")
(values #f '() '() seed)
))
(UNDECL-ROOT
(lambda (elem-gi seed) (values #f '() '() seed)))
(DECL-ROOT
(lambda (elem-gi seed) seed))
(NEW-LEVEL-SEED) ; required
(FINISH-ELEMENT) ; required
(CHAR-DATA-HANDLER) ; required
(PI ())
))
(run-test
(letrec ((simple-parser
(lambda (str doctype-fn)
(call-with-input-string str
(lambda (port)
((ssax:make-parser
NEW-LEVEL-SEED
(lambda (elem-gi attributes namespaces
expected-content seed)
'())
FINISH-ELEMENT
(lambda (elem-gi attributes namespaces parent-seed seed)
(let
((seed (if (null? namespaces) (reverse seed)
(cons (list '*NAMESPACES* namespaces)
(reverse seed)))))
(let ((seed (if (attlist-null? attributes) seed
(cons
(cons '@
(map (lambda (attr)
(list (car attr) (cdr attr)))
(attlist->alist attributes)))
seed))))
(cons (cons elem-gi seed) parent-seed))))
CHAR-DATA-HANDLER
(lambda (string1 string2 seed)
(if (string-null? string2) (cons string1 seed)
(cons* string2 string1 seed)))
DOCTYPE
(lambda (port docname systemid internal-subset? seed)
(when internal-subset?
(ssax:warn port
"Internal DTD subset is not currently handled ")
(ssax:skip-internal-dtd port))
(ssax:warn port "DOCTYPE DECL " docname " "
systemid " found and skipped")
(doctype-fn docname seed))
UNDECL-ROOT
(lambda (elem-gi seed)
(doctype-fn elem-gi seed))
)
port '())))))
(dummy-doctype-fn (lambda (elem-gi seed) (values #f '() '() seed)))
(test
(lambda (str doctype-fn expected)
(cout nl "Parsing: " str nl)
(let ((result (simple-parser (unesc-string str) doctype-fn)))
(write result)
(assert (equal? result expected)))))
)
(test "<BR/>" dummy-doctype-fn '(('"BR")))
(assert (failed? (test "<BR>" dummy-doctype-fn '())))
(test "<BR></BR>" dummy-doctype-fn '(('"BR")))
(assert (failed? (test "<BR></BB>" dummy-doctype-fn '())))
(test " <A HREF='URL'> link <I>itlink </I> &amp;amp;</A>"
dummy-doctype-fn
'(('"A" (@ ('"HREF" "URL")) " link " ('"I" "itlink ")
" " "&" "amp;")))
(test
" <A HREF='URL' xml:space='preserve'> link <I>itlink </I> &amp;amp;</A>" dummy-doctype-fn
'(('"A" (@ ('"HREF" "URL") (('"xml" . '"space") "preserve"))
" link " ('"I" "itlink ") " " "&" "amp;")))
(test " <A HREF='URL' xml:space='preserve'> link <I xml:space='default'>itlink </I> &amp;amp;</A>" dummy-doctype-fn
'(('"A" (@ ('"HREF" "URL") (('"xml" . '"space") "preserve"))
" link "
('"I" (@ (('"xml" . '"space") "default")) "itlink ")
" " "&" "amp;")))
(test "<itemize><item>This is item 1 </item>%n<!-- Just:a comment --><item>Item 2</item>%n </itemize>" dummy-doctype-fn
`(('"itemize" ('"item" "This is item 1 ")
,(unesc-string "%n") ('"item" "Item 2") ,(unesc-string "%n "))))
(test " <P><![CDATA[<BR>%n<![CDATA[<BR>]]&gt;]]></P>"
dummy-doctype-fn `(('"P" "<BR>" ,nl "<![CDATA[<BR>" "]]" "" ">")))
(test " <P><![CDATA[<BR>%r<![CDATA[<BR>]]&gt;]]></P>"
dummy-doctype-fn `(('"P" "<BR>" ,nl "<![CDATA[<BR>" "]]" "" ">")))
(test "<?xml version='1.0'?>%n%n<Reports TStamp='1'></Reports>"
dummy-doctype-fn '(('"Reports" (@ ('"TStamp" "1")))))
(test "%n<?PI xxx?><!-- Comment %n -%r-->%n<?PI1 zzz?><T/>"
dummy-doctype-fn '(('"T")))
(test "<!DOCTYPE T SYSTEM 'system1' ><!-- comment -->%n<T/>"
(lambda (elem-gi seed) (assert (equal? elem-gi ''"T"))
(values #f '() '() seed))
'(('"T")))
(test "<!DOCTYPE T PUBLIC '//EN/T' \"system1\" [ <!ELEMENT a 'aa'> ]>%n<?pi?><T/>"
(lambda (elem-gi seed) (assert (equal? elem-gi ''"T"))
(values #f '() '() seed))
'(('"T")))
(test "<BR/>"
(lambda (elem-gi seed)
(values '(('"BR" EMPTY ())) '() '() seed)) '(('"BR")))
(test "<BR></BR>"
(lambda (elem-gi seed)
(values '(('"BR" EMPTY ())) '() '() seed)) '(('"BR")))
(assert (failed? (test "<BR>aa</BR>"
(lambda (elem-gi seed)
(values '(('"BR" EMPTY ())) '() '() seed)) '())))
(test "<BR>aa</BR>"
(lambda (elem-gi seed)
(values '(('"BR" PCDATA ())) '() '() seed)) '(('"BR" "aa")))
(assert (failed? (test "<BR>a<I>a</I></BR>"
(lambda (elem-gi seed)
(values '(('"BR" PCDATA ())) '() '() seed)) '())))
(test "<BR>a<I>a</I></BR>"
(lambda (elem-gi seed)
(values '(('"BR" ANY ()) ('"I" PCDATA ())) '() '() seed))
'(('"BR" "a" ('"I" "a"))))
(test "<DIV>Example: \"&example;\"</DIV>"
(lambda (elem-gi seed)
(values #f '((example . "<P>An ampersand (&#38;) may be escaped numerically (&#38;#38;) or with a general entity (&amp;amp;).</P>")) '() seed))
'(('"DIV" "Example: \""
('"P" "An ampersand (" "&" ") may be escaped numerically (" "&" "#38;) or with a general entity (" "&" "amp;).") "\"")))
(test "<DIV>Example: \"&example;\" <P/></DIV>"
(lambda (elem-gi seed)
(values #f '(('"quote" . "<I>example:</I> ex")
('"example" . "<Q>&quote;!</Q>?")) '() seed))
'(('"DIV" "Example: \"" ('"Q" ('"I" "example:") " ex" "!") "?"
"\" " ('"P"))))
(assert (failed?
(test "<DIV>Example: \"&example;\" <P/></DIV>"
(lambda (elem-gi seed)
(values #f '(('"quote" . "<I>example:")
('"example" . "<Q>&quote;</I>!</Q>?")) '() seed))
'())))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values #f '() '() seed))
'((('"URI1" . '"DIV") (@ ('"B" "B") (('"URI1" . '"B") "A"))
(*NAMESPACES* (('"A" '"URI1" . '"URI1")
(*DEFAULT* '"URI1" . '"URI1")))
(('"URI1" . '"P")
(*NAMESPACES* ((*DEFAULT* #f . #f) ('"A" '"URI1" . '"URI1")
(*DEFAULT* '"URI1" . '"URI1")))
('"BR"
(*NAMESPACES* ((*DEFAULT* #f . #f)
('"A" '"URI1" . '"URI1")
(*DEFAULT* '"URI1" . '"URI1"))))))))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values #f '() '((#f '"UA" . '"URI1")) seed))
'((('"UA" . '"DIV") (@ ('"B" "B") (('"UA" . '"B") "A"))
(*NAMESPACES* (('"A" '"UA" . '"URI1")
(*DEFAULT* '"UA" . '"URI1") (#f '"UA" . '"URI1")))
(('"UA" . '"P")
(*NAMESPACES* ((*DEFAULT* #f . #f) ('"A" '"UA" . '"URI1")
(*DEFAULT* '"UA" . '"URI1") (#f '"UA" . '"URI1")))
('"BR"
(*NAMESPACES* ((*DEFAULT* #f . #f) ('"A" '"UA" . '"URI1")
(*DEFAULT* '"UA" . '"URI1")
(#f '"UA" . '"URI1"))))))))
; uniqattr should fail
(assert (failed?
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values
`(('"DIV" ANY (('"B" CDATA IMPLIED #f)
(('"A" . '"B") CDATA IMPLIED #f)
(('"C" . '"B") CDATA IMPLIED "xx")
(('"xmlns" . '"C") CDATA IMPLIED "URI1")
))
(('"A" . '"P") ANY ()) ('"BR" '"EMPTY" ()))
'() '((#f '"UA" . '"URI1")) seed))
'())))
; prefix C undeclared
(assert (failed?
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values
'(('"DIV" ANY (('"B" CDATA IMPLIED #f)
('"xmlns" CDATA IMPLIED "URI1")
(('"A" . '"B") CDATA IMPLIED #f)
(('"C" . '"B") CDATA IMPLIED "xx")
))
(('"A" . '"P") ANY ()) ('"BR" EMPTY ()))
'() '((#f '"UA" . '"URI1")) seed))
'())))
; contradiction to xmlns declaration
(assert (failed?
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values
'(('"DIV" ANY (('"B" CDATA IMPLIED #f)
('"xmlns" CDATA FIXED "URI2")
(('"A" . '"B") CDATA IMPLIED #f)
))
(('"A" . '"P") ANY ()) ('"BR" EMPTY ()))
'() '((#f '"UA" . '"URI1")) seed))
'())))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values
'(('"DIV" ANY (('"B" CDATA IMPLIED #f)
('"xmlns" CDATA FIXED "URI1")
(('"A" . '"B") CDATA IMPLIED #f)
))
(('"A" . '"P") ANY ()) ('"BR" EMPTY ()))
'() '((#f '"UA" . '"URI1")) seed))
'((('"UA" . '"DIV") (@ ('"B" "B") (('"UA" . '"B") "A"))
(*NAMESPACES* ((*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1") (#f '"UA" . '"URI1")))
(('"UA" . '"P")
(*NAMESPACES* ((*DEFAULT* #f . #f)
(*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1") (#f '"UA" . '"URI1")))
('"BR"
(*NAMESPACES* ((*DEFAULT* #f . #f) (*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1") (#f '"UA" . '"URI1"))))))))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>"
(lambda (elem-gi seed)
(values
'(('"DIV" ANY (('"B" CDATA IMPLIED #f)
(('"A" . '"B") CDATA IMPLIED #f)
(('"C" . '"B") CDATA IMPLIED "xx")
(('"xmlns" . '"C") CDATA IMPLIED "URI2")
))
(('"A" . '"P") ANY ()) ('"BR" EMPTY ()))
'() '((#f '"UA" . '"URI1")) seed))
'((('"UA" . '"DIV") (@ ('"B" "B") (('"UA" . '"B") "A")
(('"URI2" . '"B") "xx"))
(*NAMESPACES* ((*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1")
('"C" '"URI2" . '"URI2")
(#f '"UA" . '"URI1")))
(('"UA" . '"P")
(*NAMESPACES* ((*DEFAULT* #f . #f) (*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1")
('"C" '"URI2" . '"URI2") (#f '"UA" . '"URI1")))
('"BR"
(*NAMESPACES* ((*DEFAULT* #f . #f)
(*DEFAULT* '"UA" . '"URI1")
('"A" '"UA" . '"URI1")
('"C" '"URI2" . '"URI2")
(#f '"UA" . '"URI1"))))))))
))
;========================================================================
; Highest-level parsers: XML to SXML
;
; First, a few utility procedures that turned out useful
; ssax:reverse-collect-str LIST-OF-FRAGS -> LIST-OF-FRAGS
; given the list of fragments (some of which are text strings)
; reverse the list and concatenate adjacent text strings.
; We can prove from the general case below that if LIST-OF-FRAGS
; has zero or one element, the result of the procedure is equal?
; to its argument. This fact justifies the shortcut evaluation below.
(define (ssax:reverse-collect-str fragments)
(cond
((null? fragments) '()) ; a shortcut
((null? (cdr fragments)) fragments) ; see the comment above
(else
(let loop ((fragments fragments) (result '()) (strs '()))
(cond
((null? fragments)
(if (null? strs) result
(cons (string-concatenate/shared strs) result)))
((string? (car fragments))
(loop (cdr fragments) result (cons (car fragments) strs)))
(else
(loop (cdr fragments)
(cons
(car fragments)
(if (null? strs) result
(cons (string-concatenate/shared strs) result)))
'())))))))
; ssax:reverse-collect-str-drop-ws LIST-OF-FRAGS -> LIST-OF-FRAGS
; given the list of fragments (some of which are text strings)
; reverse the list and concatenate adjacent text strings.
; We also drop "unsignificant" whitespace, that is, whitespace
; in front, behind and between elements. The whitespace that
; is included in character data is not affected.
; We use this procedure to "intelligently" drop "insignificant"
; whitespace in the parsed SXML. If the strict compliance with
; the XML Recommendation regarding the whitespace is desired, please
; use the ssax:reverse-collect-str procedure instead.
(define (ssax:reverse-collect-str-drop-ws fragments)
(cond
((null? fragments) '()) ; a shortcut
((null? (cdr fragments)) ; another shortcut
(if (and (string? (car fragments)) (string-whitespace? (car fragments)))
'() fragments)) ; remove trailing ws
(else
(let loop ((fragments fragments) (result '()) (strs '())
(all-whitespace? #t))
(cond
((null? fragments)
(if all-whitespace? result ; remove leading ws
(cons (string-concatenate/shared strs) result)))
((string? (car fragments))
(loop (cdr fragments) result (cons (car fragments) strs)
(and all-whitespace?
(string-whitespace? (car fragments)))))
(else
(loop (cdr fragments)
(cons
(car fragments)
(if all-whitespace? result
(cons (string-concatenate/shared strs) result)))
'() #t)))))))
; procedure: ssax:xml->sxml PORT NAMESPACE-PREFIX-ASSIG
;
; This is an instance of a SSAX parser above that returns an SXML
; representation of the XML document to be read from PORT.
; NAMESPACE-PREFIX-ASSIG is a list of (USER-PREFIX . URI-STRING)
; that assigns USER-PREFIXes to certain namespaces identified by
; particular URI-STRINGs. It may be an empty list.
; The procedure returns an SXML tree. The port points out to the
; first character after the root element.
(define (ssax:xml->sxml port namespace-prefix-assig)
(letrec
((namespaces
(map (lambda (el)
(cons* #f (car el) (ssax:uri-string->symbol (cdr el))))
namespace-prefix-assig))
(RES-NAME->SXML
(lambda (res-name)
(string->symbol
(string-append
(symbol->string (car res-name))
":"
(symbol->string (cdr res-name))))))
)
(let ((result
(reverse
((ssax:make-parser
NEW-LEVEL-SEED
(lambda (elem-gi attributes namespaces
expected-content seed)
'())
FINISH-ELEMENT
(lambda (elem-gi attributes namespaces parent-seed seed)
(let ((seed (ssax:reverse-collect-str seed))
(attrs
(attlist-fold
(lambda (attr accum)
(cons (list
(if (symbol? (car attr)) (car attr)
(RES-NAME->SXML (car attr)))
(cdr attr)) accum))
'() attributes)))
(cons
(cons
(if (symbol? elem-gi) elem-gi
(RES-NAME->SXML elem-gi))
(if (null? attrs) seed
(cons (cons '@ attrs) seed)))
parent-seed)))
CHAR-DATA-HANDLER
(lambda (string1 string2 seed)
(if (string-null? string2) (cons string1 seed)
(cons* string2 string1 seed)))
DOCTYPE
(lambda (port docname systemid internal-subset? seed)
(when internal-subset?
(ssax:warn port
"Internal DTD subset is not currently handled ")
(ssax:skip-internal-dtd port))
(ssax:warn port "DOCTYPE DECL " docname " "
systemid " found and skipped")
(values #f '() namespaces seed))
UNDECL-ROOT
(lambda (elem-gi seed)
(values #f '() namespaces seed))
PI
((*DEFAULT* .
(lambda (port pi-tag seed)
(cons
(list '*PI* pi-tag (ssax:read-pi-body-as-string port))
seed))))
)
port '()))))
(cons '*TOP*
(if (null? namespace-prefix-assig) result
(cons
(list '@ (cons '*NAMESPACES*
(map (lambda (ns) (list (car ns) (cdr ns)))
namespace-prefix-assig)))
result)))
)))
; For backwards compatibility
(define SSAX:XML->SXML ssax:xml->sxml)
; a few lines of validation code
(run-test (letrec
((test (lambda (str namespace-assig expected-res)
(newline) (display "input: ")
(write (unesc-string str)) (newline) (display "Result: ")
(let ((result
(call-with-input-string (unesc-string str)
(lambda (port)
(ssax:xml->sxml port namespace-assig)))))
(pp result)
(assert (equal_? result expected-res))))))
(test " <BR/>" '() '(*TOP* (BR)))
(test "<BR></BR>" '() '(*TOP* (BR)))
(test " <BR CLEAR='ALL'%nCLASS='Class1'/>" '()
'(*TOP* (BR (@ (CLEAR "ALL") (CLASS "Class1")))))
(test " <A HREF='URL'> link <I>itlink </I> &amp;amp;</A>" '()
'(*TOP* (A (@ (HREF "URL")) " link " (I "itlink ") " &amp;")))
(test " <A HREF='URL' xml:space='preserve'> link <I>itlink </I> &amp;amp;</A>" '()
'(*TOP* (A (@ (xml:space "preserve") (HREF "URL"))
" link " (I "itlink ") " &amp;")))
(test " <A HREF='URL' xml:space='preserve'> link <I xml:space='default'>itlink </I> &amp;amp;</A>" '()
'(*TOP* (A (@ (xml:space "preserve") (HREF "URL"))
" link " (I (@ (xml:space "default"))
"itlink ") " &amp;")))
(test " <P><?pi1 p1 content ?>?<?pi2 pi2? content? ??></P>" '()
'(*TOP* (P (*PI* pi1 "p1 content ") "?"
(*PI* pi2 "pi2? content? ?"))))
(test " <P>some text <![CDATA[<]]>1%n&quot;<B>strong</B>&quot;%r</P>"
'()
`(*TOP* (P ,(unesc-string "some text <1%n\"")
(B "strong") ,(unesc-string "\"%n"))))
(test " <P><![CDATA[<BR>%n<![CDATA[<BR>]]&gt;]]></P>" '()
`(*TOP* (P ,(unesc-string "<BR>%n<![CDATA[<BR>]]>"))))
; (test "<T1><T2>it&apos;s%r%nand that%n</T2>%r%n%r%n%n</T1>" '()
; '(*TOP* (T1 (T2 "it's%nand that%n") "%n%n%n")))
(test "<T1><T2>it&apos;s%r%nand that%n</T2>%r%n%r%n%n</T1>" '()
`(*TOP* (T1 (T2 ,(unesc-string "it's%nand that%n")) ,(unesc-string "%n%n%n"))))
(test "<T1><T2>it&apos;s%rand that%n</T2>%r%n%r%n%n</T1>" '()
`(*TOP* (T1 (T2 ,(unesc-string "it's%nand that%n")) ,(unesc-string "%n%n%n"))))
(test "<!DOCTYPE T SYSTEM 'system1' ><!-- comment -->%n<T/>" '()
'(*TOP* (T)))
(test "<?xml version='1.0'?>%n<WEIGHT unit=\"pound\">%n<NET certified='certified'> 67 </NET>%n<GROSS> 95 </GROSS>%n</WEIGHT>" '()
`(*TOP* (*PI* xml "version='1.0'") (WEIGHT (@ (unit "pound"))
,nl (NET (@ (certified "certified")) " 67 ") ,nl
(GROSS " 95 ") ,nl)
))
; (test "<?xml version='1.0'?>%n<WEIGHT unit=\"pound\">%n<NET certified='certified'> 67 </NET>%n<GROSS> 95 </GROSS>%n</WEIGHT>" '()
; '(*TOP* (*PI* xml "version='1.0'") (WEIGHT (@ (unit "pound"))
; "%n" (NET (@ (certified "certified")) " 67 ")
; "%n" (GROSS " 95 ") "%n")
; ))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>" '()
'(*TOP* (URI1:DIV (@ (URI1:B "A") (B "B")) (URI1:P (BR)))))
(test "<DIV A:B='A' B='B' xmlns:A='URI1' xmlns='URI1'><A:P xmlns=''><BR/></A:P></DIV>" '((UA . "URI1"))
'(*TOP* (@ (*NAMESPACES* (UA "URI1")))
(UA:DIV (@ (UA:B "A") (B "B")) (UA:P (BR)))))
; A few tests from XML Namespaces Recommendation
(test (string-append
"<x xmlns:edi='http://ecommerce.org/schema'>"
"<!-- the 'taxClass' attribute's ns http://ecommerce.org/schema -->"
"<lineItem edi:taxClass='exempt'>Baby food</lineItem>" nl
"</x>") '()
`(*TOP*
(x (lineItem
(@ (http://ecommerce.org/schema:taxClass "exempt"))
"Baby food") ,nl)))
(test (string-append
"<x xmlns:edi='http://ecommerce.org/schema'>"
"<!-- the 'taxClass' attribute's ns http://ecommerce.org/schema -->"
"<lineItem edi:taxClass='exempt'>Baby food</lineItem>"
"</x>") '((EDI . "http://ecommerce.org/schema"))
'(*TOP*
(@ (*NAMESPACES* (EDI "http://ecommerce.org/schema")))
(x (lineItem
(@ (EDI:taxClass "exempt"))
"Baby food"))))
(test (string-append
"<bk:book xmlns:bk='urn:loc.gov:books' "
"xmlns:isbn='urn:ISBN:0-395-36341-6'>"
"<bk:title>Cheaper by the Dozen</bk:title>"
"<isbn:number>1568491379</isbn:number></bk:book>")
'()
'(*TOP* (urn:loc.gov:books:book
(urn:loc.gov:books:title "Cheaper by the Dozen")
(urn:ISBN:0-395-36341-6:number "1568491379"))))
(test (string-append
"<!-- initially, the default namespace is 'books' -->"
"<book xmlns='urn:loc.gov:books' "
"xmlns:isbn='urn:ISBN:0-395-36341-6'>"
"<title>Cheaper by the Dozen</title>"
"<isbn:number>1568491379</isbn:number>"
"<notes>"
"<!-- make HTML the default namespace for some commentary -->"
"<p xmlns='urn:w3-org-ns:HTML'>"
"This is a <i>funny</i> book!"
"</p>"
"</notes>"
"</book>") '()
'(*TOP* (urn:loc.gov:books:book
(urn:loc.gov:books:title "Cheaper by the Dozen")
(urn:ISBN:0-395-36341-6:number "1568491379")
(urn:loc.gov:books:notes
(urn:w3-org-ns:HTML:p
"This is a " (urn:w3-org-ns:HTML:i "funny")
" book!")))))
(test (string-append
"<Beers>"
"<!-- the default namespace is now that of HTML -->"
"<table xmlns='http://www.w3.org/TR/REC-html40'>"
"<th><td>Name</td><td>Origin</td><td>Description</td></th>"
"<tr>"
"<!-- no default namespace inside table cells -->"
"<td><brandName xmlns=\"\">Huntsman</brandName></td>"
"<td><origin xmlns=''>Bath, UK</origin></td>"
"<td>"
"<details xmlns=''><class>Bitter</class><hop>Fuggles</hop>"
"<pro>Wonderful hop, light alcohol, good summer beer</pro>"
"<con>Fragile; excessive variance pub to pub</con>"
"</details>"
"</td>"
"</tr>"
"</table>"
"</Beers>")
'((html . "http://www.w3.org/TR/REC-html40"))
'(*TOP*
(@ (*NAMESPACES* (html "http://www.w3.org/TR/REC-html40")))
(Beers (html:table
(html:th (html:td "Name")
(html:td "Origin")
(html:td "Description"))
(html:tr (html:td (brandName "Huntsman"))
(html:td (origin "Bath, UK"))
(html:td
(details
(class "Bitter")
(hop "Fuggles")
(pro "Wonderful hop, light alcohol, good summer beer")
(con "Fragile; excessive variance pub to pub"))))))))
(test (string-append
"<!-- 1 --><RESERVATION xmlns:HTML='http://www.w3.org/TR/REC-html40'>"
"<!-- 2 --><NAME HTML:CLASS=\"largeSansSerif\">Layman, A</NAME>"
"<!-- 3 --><SEAT CLASS='Y' HTML:CLASS=\"largeMonotype\">33B</SEAT>"
"<!-- 4 --><HTML:A HREF='/cgi-bin/ResStatus'>Check Status</HTML:A>"
"<!-- 5 --><DEPARTURE>1997-05-24T07:55:00+1</DEPARTURE></RESERVATION>")
'((HTML . "http://www.w3.org/TR/REC-html40"))
'(*TOP*
(@ (*NAMESPACES* (HTML "http://www.w3.org/TR/REC-html40")))
(RESERVATION
(NAME (@ (HTML:CLASS "largeSansSerif")) "Layman, A")
(SEAT (@ (HTML:CLASS "largeMonotype") (CLASS "Y")) "33B")
(HTML:A (@ (HREF "/cgi-bin/ResStatus")) "Check Status")
(DEPARTURE "1997-05-24T07:55:00+1"))))
; Part of RDF from the XML Infoset
(test (string-concatenate/shared '(
"<?xml version='1.0' encoding='utf-8' standalone='yes'?>"
"<!-- this can be decoded as US-ASCII or iso-8859-1 as well,"
" since it contains no characters outside the US-ASCII repertoire -->"
"<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'"
" xmlns:rdfs='http://www.w3.org/2000/01/rdf-schema#'"
" xmlns='http://www.w3.org/2001/02/infoset#'>"
"<rdfs:Class ID='Boolean'/>"
"<Boolean ID='Boolean.true'/>"
"<Boolean ID='Boolean.false'/>"
"<!--Info item classes-->"
"<rdfs:Class ID='InfoItem'/>"
"<rdfs:Class ID='Document' rdfs:subClassOf='#InfoItem'/>"
"<rdfs:Class ID='Element' rdfs:subClassOf='#InfoItem'/>"
"<rdfs:Class ID='Attribute' rdfs:subClassOf='#InfoItem'/>"
"<rdfs:Class ID='InfoItemSet'
rdfs:subClassOf='http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag'/>"
"<rdfs:Class ID='AttributeSet' rdfs:subClassOf='#InfoItemSet'/>"
"<!--Info item properties-->"
"<rdfs:Property ID='allDeclarationsProcessed'>"
"<rdfs:domain resource='#Document'/>"
"<rdfs:range resource='#Boolean'/></rdfs:Property>"
"<rdfs:Property ID='attributes'>"
"<rdfs:domain resource='#Element'/>"
"<rdfs:range resource='#AttributeSet'/>"
"</rdfs:Property>"
"</rdf:RDF>"))
'((RDF . "http://www.w3.org/1999/02/22-rdf-syntax-ns#")
(RDFS . "http://www.w3.org/2000/01/rdf-schema#")
(ISET . "http://www.w3.org/2001/02/infoset#"))
'(*TOP* (@ (*NAMESPACES*
(RDF "http://www.w3.org/1999/02/22-rdf-syntax-ns#")
(RDFS "http://www.w3.org/2000/01/rdf-schema#")
(ISET "http://www.w3.org/2001/02/infoset#")))
(*PI* xml "version='1.0' encoding='utf-8' standalone='yes'")
(RDF:RDF
(RDFS:Class (@ (ID "Boolean")))
(ISET:Boolean (@ (ID "Boolean.true")))
(ISET:Boolean (@ (ID "Boolean.false")))
(RDFS:Class (@ (ID "InfoItem")))
(RDFS:Class (@ (RDFS:subClassOf "#InfoItem") (ID "Document")))
(RDFS:Class (@ (RDFS:subClassOf "#InfoItem") (ID "Element")))
(RDFS:Class (@ (RDFS:subClassOf "#InfoItem") (ID "Attribute")))
(RDFS:Class
(@ (RDFS:subClassOf
"http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag")
(ID "InfoItemSet")))
(RDFS:Class
(@ (RDFS:subClassOf "#InfoItemSet") (ID "AttributeSet")))
(RDFS:Property
(@ (ID "allDeclarationsProcessed"))
(RDFS:domain (@ (resource "#Document")))
(RDFS:range (@ (resource "#Boolean"))))
(RDFS:Property
(@ (ID "attributes"))
(RDFS:domain (@ (resource "#Element")))
(RDFS:range (@ (resource "#AttributeSet")))))))
; Part of RDF from RSS of the Daemon News Mall
(test (string-concatenate/shared (list-intersperse '(
"<?xml version='1.0'?><rdf:RDF "
"xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' "
"xmlns='http://my.netscape.com/rdf/simple/0.9/'>"
"<channel>"
"<title>Daemon News Mall</title>"
"<link>http://mall.daemonnews.org/</link>"
"<description>Central source for all your BSD needs</description>"
"</channel>"
"<item>"
"<title>Daemon News Jan/Feb Issue NOW Available! Subscribe $24.95</title>"
"<link>http://mall.daemonnews.org/?page=shop/flypage&amp;product_id=880</link>"
"</item>"
"<item>"
"<title>The Design and Implementation of the 4.4BSD Operating System $54.95</title>"
"<link>http://mall.daemonnews.org/?page=shop/flypage&amp;product_id=912&amp;category_id=1761</link>"
"</item>"
"</rdf:RDF>")
(string #\newline)
))
'((RDF . "http://www.w3.org/1999/02/22-rdf-syntax-ns#")
(RSS . "http://my.netscape.com/rdf/simple/0.9/")
(ISET . "http://www.w3.org/2001/02/infoset#"))
`(*TOP* (@ (*NAMESPACES*
(RDF "http://www.w3.org/1999/02/22-rdf-syntax-ns#")
(RSS "http://my.netscape.com/rdf/simple/0.9/")
(ISET "http://www.w3.org/2001/02/infoset#")))
(*PI* xml "version='1.0'")
(RDF:RDF ,nl
(RSS:channel ,nl
(RSS:title "Daemon News Mall") ,nl
(RSS:link "http://mall.daemonnews.org/") ,nl
(RSS:description "Central source for all your BSD needs") ,nl) ,nl
(RSS:item ,nl
(RSS:title
"Daemon News Jan/Feb Issue NOW Available! Subscribe $24.95") ,nl
(RSS:link
"http://mall.daemonnews.org/?page=shop/flypage&product_id=880") ,nl) ,nl
(RSS:item ,nl
(RSS:title
"The Design and Implementation of the 4.4BSD Operating System $54.95") ,nl
(RSS:link
"http://mall.daemonnews.org/?page=shop/flypage&product_id=912&category_id=1761") ,nl) ,nl)))
(test (string-concatenate/shared
'("<Forecasts TStamp='958082142'>"
"<TAF TStamp='958066200' LatLon='36.583, -121.850' BId='724915'"
" SName='KMRY, MONTEREY PENINSULA'>"
"<VALID TRange='958068000, 958154400'>111730Z 111818</VALID>"
"<PERIOD TRange='958068000, 958078800'>"
"<PREVAILING>31010KT P6SM FEW030</PREVAILING>"
"</PERIOD>"
"<PERIOD TRange='958078800, 958104000' Title='FM2100'>"
"<PREVAILING>29016KT P6SM FEW040</PREVAILING>"
"</PERIOD>"
"<PERIOD TRange='958104000, 958154400' Title='FM0400'>"
"<PREVAILING>29010KT P6SM SCT200</PREVAILING>"
"<VAR Title='BECMG 0708' TRange='958114800, 958118400'>VRB05KT</VAR>"
"</PERIOD></TAF>"
"</Forecasts>"))
'()
'(*TOP* (Forecasts
(@ (TStamp "958082142"))
(TAF (@ (TStamp "958066200")
(SName "KMRY, MONTEREY PENINSULA")
(LatLon "36.583, -121.850")
(BId "724915"))
(VALID (@ (TRange "958068000, 958154400")) "111730Z 111818")
(PERIOD (@ (TRange "958068000, 958078800"))
(PREVAILING "31010KT P6SM FEW030"))
(PERIOD (@ (Title "FM2100") (TRange "958078800, 958104000"))
(PREVAILING "29016KT P6SM FEW040"))
(PERIOD (@ (Title "FM0400") (TRange "958104000, 958154400"))
(PREVAILING "29010KT P6SM SCT200")
(VAR (@ (Title "BECMG 0708")
(TRange "958114800, 958118400"))
"VRB05KT"))))))
))
(run-test
(newline)
(display "All tests passed")
(newline)
)
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