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Heed the reader settings implied by #!r6rs

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When encountering the #!r6rs directive, apply the appropriate reader
settings to the port.

* libguile/read.scm (read-string-as-list): New helper procedure.
  (scm_read_shebang): Set reader options implied by the R6RS syntax
  upon encountering the #!r6rs directive.
* test-suite/tests/reader.test (per-port-read-options): Add tests for
  the #!r6rs directive.
This commit is contained in:
Andreas Rottmann 2015-07-28 23:06:36 +02:00 • committed by Andy Wingo
parent aa13da5189
commit d77247b90b
3 changed files with 97 additions and 8 deletions
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20
NEWS
View file

@ -738,6 +738,26 @@ longer installed to the libdir. This change should be transparent to
users, but packagers may be interested.
Changes in 2.0.12 (since 2.0.11):
[Note: these changes come to 2.2 via 2.0 branch, but 2.0.12 hasn't been
released yet at the time of this writing.]
* Notable changes
** The #!r6rs directive now influences read syntax
The #!r6rs directive now changes the per-port reader options to make
Guile's reader conform more closely to the R6RS syntax. In particular:
- It makes the reader case sensitive.
- It disables the recognition of keyword syntax in conflict with the
R6RS (and R5RS).
- It enables the `square-brackets', `hungry-eol-escapes' and
`r6rs-hex-escapes' reader options.
Changes in 2.0.11 (since 2.0.10):

40
libguile/read.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995-1997, 1999-2001, 2003, 2004, 2006-2012, 2014
/* Copyright (C) 1995-1997, 1999-2001, 2003, 2004, 2006-2012, 2014, 2015
* Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
@ -1430,6 +1430,12 @@ static void set_port_square_brackets_p (SCM port, scm_t_read_opts *opts,
int value);
static void set_port_curly_infix_p (SCM port, scm_t_read_opts *opts,
int value);
static void set_port_r6rs_hex_escapes_p (SCM port, scm_t_read_opts *opts,
int value);
static void set_port_hungry_eol_escapes_p (SCM port, scm_t_read_opts *opts,
int value);
static void set_port_keyword_style (SCM port, scm_t_read_opts *opts,
enum t_keyword_style value);
static SCM
scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
@ -1451,7 +1457,13 @@ scm_read_shebang (scm_t_wchar chr, SCM port, scm_t_read_opts *opts)
scm_ungetc (c, port);
name[i] = '\0';
if (0 == strcmp ("r6rs", name))
; /* Silently ignore */
{
set_port_case_insensitive_p (port, opts, 0);
set_port_r6rs_hex_escapes_p (port, opts, 1);
set_port_square_brackets_p (port, opts, 1);
set_port_keyword_style (port, opts, KEYWORD_STYLE_HASH_PREFIX);
set_port_hungry_eol_escapes_p (port, opts, 1);
}
else if (0 == strcmp ("fold-case", name))
set_port_case_insensitive_p (port, opts, 1);
else if (0 == strcmp ("no-fold-case", name))
@ -2299,6 +2311,30 @@ set_port_curly_infix_p (SCM port, scm_t_read_opts *opts, int value)
set_port_read_option (port, READ_OPTION_CURLY_INFIX_P, value);
}
/* Set OPTS and PORT's r6rs_hex_escapes_p option according to VALUE. */
static void
set_port_r6rs_hex_escapes_p (SCM port, scm_t_read_opts *opts, int value)
{
value = !!value;
opts->r6rs_escapes_p = value;
set_port_read_option (port, READ_OPTION_R6RS_ESCAPES_P, value);
}
static void
set_port_hungry_eol_escapes_p (SCM port, scm_t_read_opts *opts, int value)
{
value = !!value;
opts->hungry_eol_escapes_p = value;
set_port_read_option (port, READ_OPTION_HUNGRY_EOL_ESCAPES_P, value);
}
static void
set_port_keyword_style (SCM port, scm_t_read_opts *opts, enum t_keyword_style value)
{
opts->keyword_style = value;
set_port_read_option (port, READ_OPTION_KEYWORD_STYLE, value);
}
/* Initialize OPTS based on PORT's read options and the global read
options. */
static void

45
test-suite/tests/reader.test
View file

@ -60,6 +60,11 @@
(lambda ()
(read-options saved-options)))))
(define (read-string-as-list s)
(with-input-from-string s
(lambda ()
(unfold eof-object? values (lambda (x) (read)) (read)))))
(with-test-prefix "reading"
(pass-if "0"
@ -432,14 +437,42 @@
(equal? '(guile GuiLe gUIle)
(with-read-options '(case-insensitive)
(lambda ()
(with-input-from-string "GUIle #!no-fold-case GuiLe gUIle"
(lambda ()
(list (read) (read) (read))))))))
(read-string-as-list "GUIle #!no-fold-case GuiLe gUIle")))))
(pass-if "case-insensitive"
(equal? '(GUIle guile guile)
(with-input-from-string "GUIle #!fold-case GuiLe gUIle"
(lambda ()
(list (read) (read) (read)))))))
(read-string-as-list "GUIle #!fold-case GuiLe gUIle")))
(with-test-prefix "r6rs"
(pass-if-equal "case sensitive"
'(guile GuiLe gUIle)
(with-read-options '(case-insensitive)
(lambda ()
(read-string-as-list "GUIle #!r6rs GuiLe gUIle"))))
(pass-if-equal "square brackets"
'((a b c) (foo 42 bar) (x . y))
(read-string-as-list "(a b c) #!r6rs [foo 42 bar] [x . y]"))
(pass-if-equal "hex string escapes"
'("native\x7fsyntax"
"\0"
"ascii\x7fcontrol"
"U\u0100BMP"
"U\U010402SMP")
(read-string-as-list (string-append "\"native\\x7fsyntax\" "
"#!r6rs "
"\"\\x0;\" "
"\"ascii\\x7f;control\" "
"\"U\\x100;BMP\" "
"\"U\\x10402;SMP\"")))
(with-test-prefix "keyword style"
(pass-if-equal "postfix disabled"
'(#:regular #:postfix postfix: #:regular2)
(with-read-options '(keywords postfix)
(lambda ()
(read-string-as-list "#:regular postfix: #!r6rs postfix: #:regular2"))))
(pass-if-equal "prefix disabled"
'(#:regular #:prefix :prefix #:regular2)
(with-read-options '(keywords prefix)
(lambda ()
(read-string-as-list "#:regular :prefix #!r6rs :prefix #:regular2")))))))
(with-test-prefix "#;"
(for-each