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| author | Craig Jennings <c@cjennings.net> | 2024-04-07 13:41:34 -0500 |
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| committer | Craig Jennings <c@cjennings.net> | 2024-04-07 13:41:34 -0500 |
| commit | 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 (patch) | |
| tree | f1190704f78f04a2b0b4c977d20fe96a828377f1 /devdocs/elisp/substitution.html | |
new repository
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| -rw-r--r-- | devdocs/elisp/substitution.html | 29 |
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diff --git a/devdocs/elisp/substitution.html b/devdocs/elisp/substitution.html new file mode 100644 index 00000000..4e0fd810 --- /dev/null +++ b/devdocs/elisp/substitution.html @@ -0,0 +1,29 @@ + <h3 class="section">Substituting for a Character Code</h3> <p>The following functions replace characters within a specified region based on their character codes. </p> <dl> <dt id="subst-char-in-region">Function: <strong>subst-char-in-region</strong> <em>start end old-char new-char &optional noundo</em> +</dt> <dd> + <p>This function replaces all occurrences of the character <var>old-char</var> with the character <var>new-char</var> in the region of the current buffer defined by <var>start</var> and <var>end</var>. Both characters must have the same length of their multibyte form. </p> <p>If <var>noundo</var> is non-<code>nil</code>, then <code>subst-char-in-region</code> does not record the change for undo and does not mark the buffer as modified. This was useful for controlling the old selective display feature (see <a href="selective-display">Selective Display</a>). </p> <p><code>subst-char-in-region</code> does not move point and returns <code>nil</code>. </p> <div class="example"> <pre class="example">---------- Buffer: foo ---------- +This is the contents of the buffer before. +---------- Buffer: foo ---------- +</pre> + +<pre class="example">(subst-char-in-region 1 20 ?i ?X) + ⇒ nil + +---------- Buffer: foo ---------- +ThXs Xs the contents of the buffer before. +---------- Buffer: foo ---------- +</pre> +</div> </dd> +</dl> <dl> <dt id="subst-char-in-string">Function: <strong>subst-char-in-string</strong> <em>fromchar tochar string &optional inplace</em> +</dt> <dd> + <p>This function replaces all occurrences of the character <var>fromchar</var> with <var>tochar</var> in <var>string</var>. By default, substitution occurs in a copy of <var>string</var>, but if the optional argument <var>inplace</var> is non-<code>nil</code>, the function modifies the <var>string</var> itself. In any case, the function returns the resulting string. </p> +</dd> +</dl> <dl> <dt id="translate-region">Command: <strong>translate-region</strong> <em>start end table</em> +</dt> <dd> +<p>This function applies a translation table to the characters in the buffer between positions <var>start</var> and <var>end</var>. </p> <p>The translation table <var>table</var> is a string or a char-table; <code>(aref <var>table</var> <var>ochar</var>)</code> gives the translated character corresponding to <var>ochar</var>. If <var>table</var> is a string, any characters with codes larger than the length of <var>table</var> are not altered by the translation. </p> <p>The return value of <code>translate-region</code> is the number of characters that were actually changed by the translation. This does not count characters that were mapped into themselves in the translation table. </p> +</dd> +</dl><div class="_attribution"> + <p class="_attribution-p"> + Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br> + <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Substitution.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Substitution.html</a> + </p> +</div> |