module/sxml/match.scm

   1 ;;; -*- mode: scheme; coding: utf-8; -*-
   2 ;;;
   3 ;;; Copyright (C) 2010 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 syntax-object->datum
  44   (syntax-rules ()
  45     ((_ stx)
  46      (syntax->datum stx))))
  47
  48 (define-syntax void
  49   (syntax-rules ()
  50     ((_) *unspecified*)))
  51
  52 (define-syntax call/ec
  53   ;; aka. `call-with-escape-continuation'
  54   (syntax-rules ()
  55     ((_ proc)
  56      (let ((prompt (make-prompt-tag)))
  57        (call-with-prompt prompt
  58                          (lambda ()
  59                            (proc (lambda args
  60                                    (apply abort-to-prompt
  61                                           prompt args))))
  62                          (lambda (_ . args)
  63                            (apply values args)))))))
  64
  65 (define-syntax let/ec
  66   (syntax-rules ()
  67     ((_ cont body ...)
  68      (call/ec (lambda (cont) body ...)))))
  69
  70 (define (raise-syntax-error x msg obj sub)
  71   (throw 'sxml-match-error x msg obj sub))
  72
  73 (define-syntax module
  74   (syntax-rules (provide require)
  75     ((_ name lang (provide p_ ...) (require r_ ...)
  76         body ...)
  77      (begin body ...))))
  78
  79 \f
  80 ;;;
  81 ;;; Include upstream source file.
  82 ;;;
  83
  84 ;; This file was taken from
  85 ;; <http://planet.plt-scheme.org/package-source/jim/sxml-match.plt/1/1/> on
  86 ;; 2010-05-24.  It was written by Jim Bender <benderjg2@aol.com> and released
  87 ;; under the MIT/X11 license
  88 ;; <http://www.gnu.org/licenses/license-list.html#X11License>.
  89 ;;
  90 ;; Modified the `sxml-match1' macro to allow multiple-value returns (upstream
  91 ;; was notified.)
  92
  93 (include-from-path "sxml/sxml-match.ss")
  94
  95 ;;; match.scm ends here