module/sxml/match.scm

   1 ;;; -*- mode: scheme; coding: utf-8; -*-
   2 ;;;
   3 ;;; Copyright (C) 2010, 2011 Free Software Foundation, Inc.
   4 ;;;
   5 ;;; This library is free software; you can redistribute it and/or modify it
   6 ;;; under the terms of the GNU Lesser General Public License as published by
   7 ;;; the Free Software Foundation; either version 3 of the License, or (at
   8 ;;; your option) any later version.
   9 ;;;
  10 ;;; This library is distributed in the hope that it will be useful, but
  11 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
  13 ;;; General Public License for more details.
  14 ;;;
  15 ;;; You should have received a copy of the GNU Lesser General Public License
  16 ;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 (define-module (sxml match)
  19   #:export (sxml-match
  20             sxml-match-let
  21             sxml-match-let*)
  22   #:use-module (srfi srfi-1)
  23   #:use-module (srfi srfi-11))
  24
  25 \f
  26 ;;; Commentary:
  27 ;;;
  28 ;;; This module provides an SXML pattern matcher, written by Jim Bender.  This
  29 ;;; allows application code to match on SXML nodes and attributes without having
  30 ;;; to deal with the details of s-expression matching, without worrying about
  31 ;;; the order of attributes, etc.
  32 ;;;
  33 ;;; It is fully documented in the Guile Reference Manual.
  34 ;;;
  35 ;;; Code:
  36
  37
  38 \f
  39 ;;;
  40 ;;; PLT compatibility layer.
  41 ;;;
  42
  43 (define-syntax-rule (syntax-object->datum stx)
  44   (syntax->datum stx))
  45
  46 (define-syntax-rule (void)
  47   *unspecified*)
  48
  49 (define %call/ec-prompt
  50   (make-prompt-tag))
  51
  52 (define-syntax-rule (call/ec proc)
  53   ;; aka. `call-with-escape-continuation'
  54   (call-with-prompt %call/ec-prompt
  55                     (lambda ()
  56                       (proc (lambda args
  57                               (apply abort-to-prompt
  58                                      %call/ec-prompt args))))
  59                     (lambda (_ . args)
  60                       (apply values args))))
  61
  62 (define-syntax-rule (let/ec cont body ...)
  63   (call/ec (lambda (cont) body ...)))
  64
  65 (define (raise-syntax-error x msg obj sub)
  66   (throw 'sxml-match-error x msg obj sub))
  67
  68 (define-syntax module
  69   (syntax-rules (provide require)
  70     ((_ name lang (provide p_ ...) (require r_ ...)
  71         body ...)
  72      (begin body ...))))
  73
  74 \f
  75 ;;;
  76 ;;; Include upstream source file.
  77 ;;;
  78
  79 ;; This file was taken from
  80 ;; <http://planet.plt-scheme.org/package-source/jim/sxml-match.plt/1/1/> on
  81 ;; 2010-05-24.  It was written by Jim Bender <benderjg2@aol.com> and released
  82 ;; under the MIT/X11 license
  83 ;; <http://www.gnu.org/licenses/license-list.html#X11License>.
  84 ;;
  85 ;; Modified the `sxml-match1' macro to allow multiple-value returns (upstream
  86 ;; was notified.)
  87
  88 (include-from-path "sxml/sxml-match.ss")
  89
  90 ;;; match.scm ends here