| 1 | ;;; rng-util.el --- utility functions for RELAX NG library |
| 2 | |
| 3 | ;; Copyright (C) 2003, 2007-2012 Free Software Foundation, Inc. |
| 4 | |
| 5 | ;; Author: James Clark |
| 6 | ;; Keywords: XML, RelaxNG |
| 7 | |
| 8 | ;; This file is part of GNU Emacs. |
| 9 | |
| 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
| 11 | ;; it under the terms of the GNU General Public License as published by |
| 12 | ;; the Free Software Foundation, either version 3 of the License, or |
| 13 | ;; (at your option) any later version. |
| 14 | |
| 15 | ;; GNU Emacs is distributed in the hope that it will be useful, |
| 16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | ;; GNU General Public License for more details. |
| 19 | |
| 20 | ;; You should have received a copy of the GNU General Public License |
| 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
| 22 | |
| 23 | ;;; Commentary: |
| 24 | |
| 25 | ;;; Code: |
| 26 | |
| 27 | (defun rng-make-datatypes-uri (uri) |
| 28 | (if (string-equal uri "") |
| 29 | ;; The spec doesn't say to do this, but it's perfectly conformant |
| 30 | ;; and better than using nil, I think. |
| 31 | 'http://relaxng.org/ns/structure/1.0 |
| 32 | (intern uri))) |
| 33 | |
| 34 | (defconst rng-xsd-datatypes-uri |
| 35 | (rng-make-datatypes-uri "http://www.w3.org/2001/XMLSchema-datatypes")) |
| 36 | |
| 37 | (defconst rng-builtin-datatypes-uri (rng-make-datatypes-uri "")) |
| 38 | |
| 39 | (defun rng-uniquify-eq (list) |
| 40 | "Destructively remove `eq' duplicates from LIST." |
| 41 | (and list |
| 42 | (let ((head list)) |
| 43 | (while (cdr head) |
| 44 | (if (eq (car head) (cadr head)) |
| 45 | (setcdr head (cddr head))) |
| 46 | (setq head (cdr head))) |
| 47 | list))) |
| 48 | |
| 49 | (defun rng-uniquify-equal (list) |
| 50 | "Destructively remove `equal' duplicates from LIST." |
| 51 | (and list |
| 52 | (let ((head list)) |
| 53 | (while (cdr head) |
| 54 | (if (equal (car head) (cadr head)) |
| 55 | (setcdr head (cddr head))) |
| 56 | (setq head (cdr head))) |
| 57 | list))) |
| 58 | |
| 59 | (defun rng-blank-p (str) (string-match "\\`[ \t\n\r]*\\'" str)) |
| 60 | |
| 61 | (defun rng-substq (new old list) |
| 62 | "Replace first member of LIST (if any) that is `eq' to OLD by NEW. |
| 63 | LIST is not modified." |
| 64 | (cond ((null list) nil) |
| 65 | ((eq (car list) old) |
| 66 | (cons new (cdr list))) |
| 67 | (t |
| 68 | (let ((tail (cons (car list) |
| 69 | nil)) |
| 70 | (rest (cdr list))) |
| 71 | (setq list tail) |
| 72 | (while rest |
| 73 | (let ((item (car rest))) |
| 74 | (setq rest (cdr rest)) |
| 75 | (cond ((eq item old) |
| 76 | (setcdr tail |
| 77 | (cons new rest)) |
| 78 | (setq rest nil)) |
| 79 | (t |
| 80 | (setq tail |
| 81 | (setcdr tail |
| 82 | (cons item nil)))))))) |
| 83 | list))) |
| 84 | |
| 85 | (defun rng-complete-before-point (start table prompt &optional predicate hist) |
| 86 | "Complete text between START and point. |
| 87 | Replaces the text between START and point with a string chosen using a |
| 88 | completion table and, when needed, input read from the user with the |
| 89 | minibuffer. |
| 90 | Returns the new string if either a complete and unique completion was |
| 91 | determined automatically or input was read from the user. Otherwise, |
| 92 | returns nil. |
| 93 | TABLE is an alist, a symbol bound to a function or an obarray as with |
| 94 | the function `completing-read'. |
| 95 | PROMPT is the string to prompt with if user input is needed. |
| 96 | PREDICATE is nil or a function as with `completing-read'. |
| 97 | HIST, if non-nil, specifies a history list as with `completing-read'." |
| 98 | (let* ((orig (buffer-substring-no-properties start (point))) |
| 99 | (completion (try-completion orig table predicate))) |
| 100 | (cond ((not completion) |
| 101 | (if (string= orig "") |
| 102 | (message "No completions available") |
| 103 | (message "No completion for %s" (rng-quote-string orig))) |
| 104 | (ding) |
| 105 | nil) |
| 106 | ((eq completion t) orig) |
| 107 | ((not (string= completion orig)) |
| 108 | (delete-region start (point)) |
| 109 | (insert completion) |
| 110 | (cond ((not (rng-completion-exact-p completion table predicate)) |
| 111 | (message "Incomplete") |
| 112 | nil) |
| 113 | ((eq (try-completion completion table predicate) t) |
| 114 | completion) |
| 115 | (t |
| 116 | (message "Complete but not unique") |
| 117 | nil))) |
| 118 | (t |
| 119 | (setq completion |
| 120 | (let ((saved-minibuffer-setup-hook |
| 121 | (default-value 'minibuffer-setup-hook))) |
| 122 | (add-hook 'minibuffer-setup-hook |
| 123 | 'minibuffer-completion-help |
| 124 | t) |
| 125 | (unwind-protect |
| 126 | (completing-read prompt |
| 127 | table |
| 128 | predicate |
| 129 | nil |
| 130 | orig |
| 131 | hist) |
| 132 | (setq-default minibuffer-setup-hook |
| 133 | saved-minibuffer-setup-hook)))) |
| 134 | (delete-region start (point)) |
| 135 | (insert completion) |
| 136 | completion)))) |
| 137 | |
| 138 | (defun rng-completion-exact-p (string table predicate) |
| 139 | (cond ((symbolp table) |
| 140 | (funcall table string predicate 'lambda)) |
| 141 | ((vectorp table) |
| 142 | (intern-soft string table)) |
| 143 | (t (assoc string table)))) |
| 144 | |
| 145 | (defun rng-quote-string (s) |
| 146 | (concat "\"" s "\"")) |
| 147 | |
| 148 | (defun rng-escape-string (s) |
| 149 | (replace-regexp-in-string "[&\"<>]" |
| 150 | (lambda (match) |
| 151 | (cdr (assoc match |
| 152 | '(("&" . "&") |
| 153 | ("\"" . """) |
| 154 | (">" . ">") |
| 155 | ("<" . "<"))))) |
| 156 | s |
| 157 | t)) |
| 158 | |
| 159 | (defun rng-collapse-space (string) |
| 160 | (setq string |
| 161 | (replace-regexp-in-string "[ \t\r\n]+" " " string t t)) |
| 162 | (when (string-match "\\` " string) |
| 163 | (setq string (substring string 1))) |
| 164 | (when (string-match " \\'" string) |
| 165 | (setq string (substring string 0 -1))) |
| 166 | string) |
| 167 | |
| 168 | (provide 'rng-util) |
| 169 | |
| 170 | ;;; rng-util.el ends here |