mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 03:40:34 +02:00
e840cc6540
* module/language/elisp/parser.scm: New parser file. * module/language/elisp/lexer.scm: Fix lexer/1 and add unquote-splicing support. * module/language/elisp/spec.scm: Use new elisp-reader. * module/language/elisp/README: Document we've got a reader now. * test-suite/tests/elisp-reader.test: Test the parser.
76 lines
2.8 KiB
Scheme
76 lines
2.8 KiB
Scheme
;;; Guile Emac Lisp
|
|
|
|
;; Copyright (C) 2001 Free Software Foundation, Inc.
|
|
|
|
;; This program is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
;;
|
|
;; This program is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
;;
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with this program; see the file COPYING. If not, write to
|
|
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Code:
|
|
|
|
(define-module (language elisp parser)
|
|
#:use-module (language elisp lexer)
|
|
#:use-module (language ecmascript parse-lalr)
|
|
#:export (read-elisp))
|
|
|
|
; The parser (reader) for elisp expressions. It is implemented using the
|
|
; (text parse-lalr) parser generator and uses my hand-written lexer as
|
|
; the tokenizer.
|
|
|
|
|
|
; Build the parser itself using parse-lalr.
|
|
|
|
(define elisp-parser
|
|
(lalr-parser (integer float symbol character string
|
|
paren-open paren-close square-open square-close
|
|
dot quote backquote unquote unquote-splicing)
|
|
|
|
; Expressions are our main interest.
|
|
; It seems the symbol we're interested for return from the parser must
|
|
; come very first, so here it is.
|
|
(expression (integer) -> $1
|
|
(float) -> $1
|
|
(symbol) -> $1
|
|
(character) -> $1
|
|
(string) -> $1
|
|
(list) -> $1
|
|
(quotation) -> $1
|
|
(vector) -> $1)
|
|
|
|
; Pairs, lists and dotted lists.
|
|
(partial-list (expression) -> (list $1)
|
|
(expression dot expression) -> (cons $1 $3)
|
|
(expression partial-list) -> (cons $1 $2))
|
|
(list (paren-open paren-close) -> '()
|
|
(paren-open dot expression paren-close) -> $3
|
|
(paren-open partial-list paren-close) -> $2)
|
|
|
|
; Quotation and unquotation expressions.
|
|
(quotation (quote expression) -> `(quote ,$2)
|
|
(backquote expression) -> `(\` ,$2)
|
|
(unquote expression) -> `(\, ,$2)
|
|
(unquote-splicing expression) -> `(\,@ ,$2))
|
|
|
|
; Vectors.
|
|
(vector-elements (expression) -> (list $1)
|
|
(expression vector-elements) -> (cons $1 $2))
|
|
(vector (square-open square-close) -> (make-vector 0)
|
|
(square-open vector-elements square-close) -> (list->vector $2))))
|
|
|
|
|
|
; Use the parser to define the elisp reader function.
|
|
; We only want to read a single expression at a time, so use get-lexer/1.
|
|
|
|
(define (read-elisp port)
|
|
(elisp-parser (get-lexer/1 port) error))
|