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119 lines
3.4 KiB
Scheme
119 lines
3.4 KiB
Scheme
;"scmacro.scm", port for Syntactic Closures macro implementation -*- Scheme -*-
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;Copyright (C) 1992, 1993, 1994 Aubrey Jaffer
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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;;;; Syntaxer Output Interface
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(define syntax-error slib:error)
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(define impl-error slib:error)
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(define (append-map procedure . lists)
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(apply append (apply map (cons procedure lists))))
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(define *counter* 0)
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(define (make-name-generator)
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(let ((suffix-promise
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(make-promise
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(lambda ()
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(string-append "."
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(number->string (begin
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(set! *counter* (+ *counter* 1))
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*counter*)))))))
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(lambda (identifier)
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(string->symbol
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(string-append "."
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(symbol->string (identifier->symbol identifier))
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(promise:force suffix-promise))))))
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(define (output/variable name)
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name)
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(define (output/literal-unquoted datum)
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datum)
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(define (output/literal-quoted datum);was output/constant (inefficient)
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`(QUOTE ,datum))
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(define (output/assignment name value)
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`(SET! ,name ,value))
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(define (output/top-level-definition name value)
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`(DEFINE ,name ,value))
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(define (output/conditional predicate consequent alternative)
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`(IF ,predicate ,consequent ,alternative))
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(define (output/sequence expressions)
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(if (null? (cdr expressions))
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(car expressions)
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`(BEGIN ,@expressions)))
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(define (output/combination operator operands)
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`(,operator ,@operands))
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(define (output/lambda pattern body)
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`(LAMBDA ,pattern ,body))
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(define (output/delay expression)
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`(DELAY ,expression))
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(define (output/unassigned)
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`'*UNASSIGNED*)
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(define (output/unspecific)
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`'*UNSPECIFIC*)
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(require 'promise) ; Portable support for force and delay.
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(require 'record)
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(require 'synchk) ; Syntax checker.
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;;; This file is the macro expander proper.
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(slib:load (in-vicinity (library-vicinity) "synclo"))
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;;; These files define the R4RS syntactic environment.
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(slib:load (in-vicinity (library-vicinity) "r4rsyn"))
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(slib:load (in-vicinity (library-vicinity) "synrul"))
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;;; OK, time to build the databases.
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(initialize-scheme-syntactic-environment!)
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;;; MACRO:EXPAND is for you to use. It takes an R4RS expression, macro-expands
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;;; it, and returns the result of the macro expansion.
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(define (synclo:expand expression)
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(set! *counter* 0)
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(compile/top-level (list expression) scheme-syntactic-environment))
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(define macro:expand synclo:expand)
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;;; Here are EVAL, EVAL! and LOAD which expand macros. You can replace the
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;;; implementation's eval and load with them if you like.
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(define base:eval slib:eval)
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(define base:load load)
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(define (synclo:eval x) (base:eval (macro:expand x)))
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(define macro:eval synclo:eval)
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(define (synclo:load <pathname>)
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(slib:eval-load <pathname> synclo:eval))
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(define macro:load synclo:load)
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(provide 'syntactic-closures)
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(provide 'macro) ;Here because we may have
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;(require 'sc-macro)
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