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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gdb/Conditional-Init-Constructs.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gdb/Conditional-Init-Constructs.html b/share/doc/gdb/Conditional-Init-Constructs.html new file mode 100644 index 0000000..c5ba13a --- /dev/null +++ b/share/doc/gdb/Conditional-Init-Constructs.html @@ -0,0 +1,193 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Conditional Init Constructs</title> + +<meta name="description" content="Debugging with GDB: Conditional Init Constructs"> +<meta name="keywords" content="Debugging with GDB: Conditional Init Constructs"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Readline-Init-File.html#Readline-Init-File" rel="up" title="Readline Init File"> +<link href="Sample-Init-File.html#Sample-Init-File" rel="next" title="Sample Init File"> +<link href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" rel="previous" title="Readline Init File Syntax"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Conditional-Init-Constructs"></a> +<div class="header"> +<p> +Next: <a href="Sample-Init-File.html#Sample-Init-File" accesskey="n" rel="next">Sample Init File</a>, Previous: <a href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" accesskey="p" rel="previous">Readline Init File Syntax</a>, Up: <a href="Readline-Init-File.html#Readline-Init-File" accesskey="u" rel="up">Readline Init File</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Conditional-Init-Constructs-1"></a> +<h4 class="subsection">32.3.2 Conditional Init Constructs</h4> + +<p>Readline implements a facility similar in spirit to the conditional +compilation features of the C preprocessor which allows key +bindings and variable settings to be performed as the result +of tests. There are four parser directives used. +</p> +<dl compact="compact"> +<dt><code>$if</code></dt> +<dd><p>The <code>$if</code> construct allows bindings to be made based on the +editing mode, the terminal being used, or the application using +Readline. The text of the test, after any comparison operator, +extends to the end of the line; +unless otherwise noted, no characters are required to isolate it. +</p> +<dl compact="compact"> +<dt><code>mode</code></dt> +<dd><p>The <code>mode=</code> form of the <code>$if</code> directive is used to test +whether Readline is in <code>emacs</code> or <code>vi</code> mode. +This may be used in conjunction +with the ‘<samp>set keymap</samp>’ command, for instance, to set bindings in +the <code>emacs-standard</code> and <code>emacs-ctlx</code> keymaps only if +Readline is starting out in <code>emacs</code> mode. +</p> +</dd> +<dt><code>term</code></dt> +<dd><p>The <code>term=</code> form may be used to include terminal-specific +key bindings, perhaps to bind the key sequences output by the +terminal’s function keys. The word on the right side of the +‘<samp>=</samp>’ is tested against both the full name of the terminal and +the portion of the terminal name before the first ‘<samp>-</samp>’. This +allows <code>sun</code> to match both <code>sun</code> and <code>sun-cmd</code>, +for instance. +</p> +</dd> +<dt><code>version</code></dt> +<dd><p>The <code>version</code> test may be used to perform comparisons against +specific Readline versions. +The <code>version</code> expands to the current Readline version. +The set of comparison operators includes +‘<samp>=</samp>’ (and ‘<samp>==</samp>’), ‘<samp>!=</samp>’, ‘<samp><=</samp>’, ‘<samp>>=</samp>’, ‘<samp><</samp>’, +and ‘<samp>></samp>’. +The version number supplied on the right side of the operator consists +of a major version number, an optional decimal point, and an optional +minor version (e.g., ‘<samp>7.1</samp>’). If the minor version is omitted, it +is assumed to be ‘<samp>0</samp>’. +The operator may be separated from the string <code>version</code> and +from the version number argument by whitespace. +The following example sets a variable if the Readline version being used +is 7.0 or newer: +</p><div class="example"> +<pre class="example">$if version >= 7.0 +set show-mode-in-prompt on +$endif +</pre></div> + +</dd> +<dt><code>application</code></dt> +<dd><p>The <var>application</var> construct is used to include +application-specific settings. Each program using the Readline +library sets the <var>application name</var>, and you can test for +a particular value. +This could be used to bind key sequences to functions useful for +a specific program. For instance, the following command adds a +key sequence that quotes the current or previous word in Bash: +</p><div class="example"> +<pre class="example">$if Bash +# Quote the current or previous word +"\C-xq": "\eb\"\ef\"" +$endif +</pre></div> + +</dd> +<dt><code>variable</code></dt> +<dd><p>The <var>variable</var> construct provides simple equality tests for Readline +variables and values. +The permitted comparison operators are ‘<samp>=</samp>’, ‘<samp>==</samp>’, and ‘<samp>!=</samp>’. +The variable name must be separated from the comparison operator by +whitespace; the operator may be separated from the value on the right hand +side by whitespace. +Both string and boolean variables may be tested. Boolean variables must be +tested against the values <var>on</var> and <var>off</var>. +The following example is equivalent to the <code>mode=emacs</code> test described +above: +</p><div class="example"> +<pre class="example">$if editing-mode == emacs +set show-mode-in-prompt on +$endif +</pre></div> +</dd> +</dl> + +</dd> +<dt><code>$endif</code></dt> +<dd><p>This command, as seen in the previous example, terminates an +<code>$if</code> command. +</p> +</dd> +<dt><code>$else</code></dt> +<dd><p>Commands in this branch of the <code>$if</code> directive are executed if +the test fails. +</p> +</dd> +<dt><code>$include</code></dt> +<dd><p>This directive takes a single filename as an argument and reads commands +and bindings from that file. +For example, the following directive reads from <samp>/etc/inputrc</samp>: +</p><div class="example"> +<pre class="example">$include /etc/inputrc +</pre></div> +</dd> +</dl> + +<hr> +<div class="header"> +<p> +Next: <a href="Sample-Init-File.html#Sample-Init-File" accesskey="n" rel="next">Sample Init File</a>, Previous: <a href="Readline-Init-File-Syntax.html#Readline-Init-File-Syntax" accesskey="p" rel="previous">Readline Init File Syntax</a>, Up: <a href="Readline-Init-File.html#Readline-Init-File" accesskey="u" rel="up">Readline Init File</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |