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88e41e94d3
* module/sxml/match.scm (%call/ec-prompt): New variable. (call/ec): Use it instead of creating a new prompt tag.
97 lines
2.8 KiB
Scheme
97 lines
2.8 KiB
Scheme
;;; -*- mode: scheme; coding: utf-8; -*-
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;;;
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;;; Copyright (C) 2010 Free Software Foundation, Inc.
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;;;
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;;; This library is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU Lesser General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; This library is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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;;; General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Lesser General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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(define-module (sxml match)
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#:export (sxml-match
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sxml-match-let
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sxml-match-let*)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11))
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;;; Commentary:
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;;;
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;;; This module provides an SXML pattern matcher, written by Jim Bender. This
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;;; allows application code to match on SXML nodes and attributes without having
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;;; to deal with the details of s-expression matching, without worrying about
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;;; the order of attributes, etc.
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;;;
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;;; It is fully documented in the Guile Reference Manual.
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;;;
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;;; Code:
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;;;
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;;; PLT compatibility layer.
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;;;
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(define-syntax syntax-object->datum
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(syntax-rules ()
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((_ stx)
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(syntax->datum stx))))
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(define-syntax void
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(syntax-rules ()
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((_) *unspecified*)))
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(define %call/ec-prompt
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(make-prompt-tag))
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(define-syntax call/ec
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;; aka. `call-with-escape-continuation'
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(syntax-rules ()
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((_ proc)
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(call-with-prompt %call/ec-prompt
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(lambda ()
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(proc (lambda args
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(apply abort-to-prompt
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%call/ec-prompt args))))
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(lambda (_ . args)
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(apply values args))))))
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(define-syntax let/ec
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(syntax-rules ()
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((_ cont body ...)
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(call/ec (lambda (cont) body ...)))))
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(define (raise-syntax-error x msg obj sub)
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(throw 'sxml-match-error x msg obj sub))
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(define-syntax module
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(syntax-rules (provide require)
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((_ name lang (provide p_ ...) (require r_ ...)
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body ...)
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(begin body ...))))
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;;;
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;;; Include upstream source file.
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;;;
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;; This file was taken from
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;; <http://planet.plt-scheme.org/package-source/jim/sxml-match.plt/1/1/> on
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;; 2010-05-24. It was written by Jim Bender <benderjg2@aol.com> and released
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;; under the MIT/X11 license
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;; <http://www.gnu.org/licenses/license-list.html#X11License>.
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;;
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;; Modified the `sxml-match1' macro to allow multiple-value returns (upstream
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;; was notified.)
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(include-from-path "sxml/sxml-match.ss")
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;;; match.scm ends here
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