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