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;;; rng-pttrn.el --- RELAX NG patterns -*- lexical-binding:t -*-
;; Copyright (C) 2003, 2007-2025 Free Software Foundation, Inc.
;; Author: James Clark
;; Keywords: text, hypermedia, languages, XML, RelaxNG
;; This file is part of GNU Emacs.
;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; pattern ::=
;; (ref <pattern> <local-name>)
;; | (choice <pattern> <pattern> ...)
;; | (group <pattern> <pattern> ...)
;; | (interleave <pattern> <pattern> ...)
;; | (zero-or-more <pattern>)
;; | (one-or-more <pattern>)
;; | (optional <pattern>)
;; | (mixed <pattern>)
;; | (value <datatype> <string> <context>)
;; | (data <datatype> <params>)
;; | (data-except <datatype> <params> <pattern>)
;; | (list <pattern>)
;; | (element <name-class> <pattern>)
;; | (attribute <name-class> <pattern>)
;; | (text)
;; | (empty)
;; | (not-allowed)
;;
;; params ::=
;; ((<param-name> . <param-value> ) ...)
;; param-name ::= <symbol>
;; param-value ::= <string>
;;
;; name-class ::=
;; (name <name>)
;; | (any-name)
;; | (any-name-except <name-class>)
;; | (ns-name <ns>)
;; | (ns-name-except <ns> <name-class>)
;; | (choice <name-class> <name-class> ...)
;;
;; name ::= (<ns> . <local-name>)
;; ns ::= nil | <symbol>
;; local-name ::= <string>
;; datatype ::= (<datatype-uri> . <datatype-local-name>)
;; datatype-uri ::= nil | <symbol>
;; datatype-local-name ::= <symbol>
;;; Code:
(defvar rng-schema-change-hook nil
"Hook to be run after `rng-current-schema' changes.")
(defvar-local rng-current-schema nil
"Pattern to be used as schema for the current buffer.")
(defun rng-make-ref (name)
(list 'ref nil name))
(defun rng-ref-set (ref pattern)
(setcar (cdr ref) pattern))
(defun rng-ref-get (ref) (cadr ref))
(defun rng-make-choice (patterns)
(cons 'choice patterns))
(defun rng-make-group (patterns)
(cons 'group patterns))
(defun rng-make-interleave (patterns)
(cons 'interleave patterns))
(defun rng-make-zero-or-more (pattern)
(list 'zero-or-more pattern))
(defun rng-make-one-or-more (pattern)
(list 'one-or-more pattern))
(defun rng-make-optional (pattern)
(list 'optional pattern))
(defun rng-make-mixed (pattern)
(list 'mixed pattern))
(defun rng-make-value (datatype str context)
(list 'value datatype str context))
(defun rng-make-data (name params)
(list 'data name params))
(defun rng-make-data-except (name params pattern)
(list 'data-except name params pattern))
(defun rng-make-list (pattern)
(list 'list pattern))
(defun rng-make-element (name-class pattern)
(list 'element name-class pattern))
(defun rng-make-attribute (name-class pattern)
(list 'attribute name-class pattern))
(defun rng-make-text ()
'(text))
(defun rng-make-empty ()
'(empty))
(defun rng-make-not-allowed ()
'(not-allowed))
(defun rng-make-any-name-name-class ()
'(any-name))
(defun rng-make-any-name-except-name-class (name-class)
(list 'any-name-except name-class))
(defun rng-make-ns-name-name-class (ns)
(list 'ns-name ns))
(defun rng-make-ns-name-except-name-class (ns name-class)
(list 'ns-name-except ns name-class))
(defun rng-make-name-name-class (name)
(list 'name name))
(defun rng-make-choice-name-class (name-classes)
(cons 'choice name-classes))
(defconst rng-any-content
(let* ((ref (rng-make-ref "any-content"))
(pattern (rng-make-zero-or-more
(rng-make-choice
(list
(rng-make-text)
(rng-make-attribute (rng-make-any-name-name-class)
(rng-make-text))
(rng-make-element (rng-make-any-name-name-class)
ref))))))
(rng-ref-set ref pattern)
pattern)
"A pattern that matches the attributes and content of any element.")
(defconst rng-any-element
(let* ((ref (rng-make-ref "any-element"))
(pattern
(rng-make-element
(rng-make-any-name-name-class)
(rng-make-zero-or-more
(rng-make-choice
(list
(rng-make-text)
(rng-make-attribute (rng-make-any-name-name-class)
(rng-make-text))
ref))))))
(rng-ref-set ref pattern)
pattern)
"A pattern that matches any element.")
;;; Names
(defun rng-make-name (ns local-name)
(cons ns local-name))
;;; Datatypes
(defun rng-make-datatype (uri local-name)
(cons uri (intern local-name)))
(provide 'rng-pttrn)
;;; rng-pttrn.el ends here
|
