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<h2><span class="refentrytitle"><a name="ctpl-CtplLexerExpr.top_of_page"></a>CtplLexerExpr</span></h2>
<p>CtplLexerExpr — Syntax analyser for mathematical/test expressions</p>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="ctpl-CtplLexerExpr.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <ctpl/ctpl.h>
#define <a class="link" href="ctpl-CtplLexerExpr.html#CTPL-LEXER-EXPR-ERROR:CAPS" title="CTPL_LEXER_EXPR_ERROR">CTPL_LEXER_EXPR_ERROR</a>
enum <a class="link" href="ctpl-CtplLexerExpr.html#CtplLexerExprError" title="enum CtplLexerExprError">CtplLexerExprError</a>;
<a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex" title="ctpl_lexer_expr_lex ()">ctpl_lexer_expr_lex</a> (<em class="parameter"><code><a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> *stream</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex-full" title="ctpl_lexer_expr_lex_full ()">ctpl_lexer_expr_lex_full</a> (<em class="parameter"><code><a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> *stream</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> lex_all</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
<a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex-string" title="ctpl_lexer_expr_lex_string ()">ctpl_lexer_expr_lex_string</a> (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *expr</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gssize"><span class="type">gssize</span></a> len</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="ctpl-CtplLexerExpr.description"></a><h2>Description</h2>
<p>
Syntax analyser for mathematical or test expressions creating a token tree
from an expression.
</p>
<p>
To analyse an expression, use <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex" title="ctpl_lexer_expr_lex ()"><code class="function">ctpl_lexer_expr_lex()</code></a>. The resulting expression
should be freed with <a class="link" href="ctpl-CtplToken.html#ctpl-token-expr-free" title="ctpl_token_expr_free ()"><code class="function">ctpl_token_expr_free()</code></a> when no longer needed.
</p>
<p>
An expression is something like a mathematical expression that can include
references to variables. The allowed things are:
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">Binary operators</span></p></td>
<td>
<p>
addition (<code class="code">+</code>),
subtraction (<code class="code">-</code>),
multiplication (<code class="code">*</code>),
division (<code class="code">/</code>),
modulo (<code class="code">%</code>),
and the boolean
equality (<code class="code">==</code>),
non-equality (<code class="code">!=</code>),
inferiority (<code class="code"><</code>),
inferiority-or-equality (<code class="code"><=</code>),
superiority (<code class="code">></code>),
superiority-or-equality (<code class="code">>=</code>),
AND (<code class="code">&&</code>),
and
OR (<code class="code">||</code>).
</p>
<p>
The boolean operators results to the integer 0 if their expression
evaluates to false, or to the positive integer 1 if their expression
evaluates to true.
This result might be used as a plain integer.
</p>
<p>
The operators' priority is very common: boolean operators have the
higher priority, followed by division, modulo and multiplication, and
finally addition and subtraction which have the lower priority.
When two operators have the same priority, the left one is prior over
the right one.
</p>
</td>
</tr>
<tr>
<td><p><span class="term">Unary operators</span></p></td>
<td><p>
The unary operators plus (<code class="code">+</code>) and minus (<code class="code">-</code>),
that may precede any numeric operand.
</p></td>
</tr>
<tr>
<td><p><span class="term">Operands</span></p></td>
<td><p>
Any numeric constant that <a class="link" href="ctpl-CtplInputStream.html#ctpl-input-stream-read-number" title="ctpl_input_stream_read_number ()"><code class="function">ctpl_input_stream_read_number()</code></a> supports,
any reference to any
<a class="link" href="ctpl-CtplEnviron.html" title="CtplEnviron">environment</a> variable,
or any string literal that <a class="link" href="ctpl-CtplInputStream.html#ctpl-input-stream-read-string-literal" title="ctpl_input_stream_read_string_literal ()"><code class="function">ctpl_input_stream_read_string_literal()</code></a>
supports.
An operand may be suffixed with an index of the form
<code class="code">[<expression>]</code>.
</p></td>
</tr>
<tr>
<td><p><span class="term">Parentheses</span></p></td>
<td><p>
Parentheses may be placed to delimit sub-expressions, allowing a fine
control over operator priority.
</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
<p>
</p>
<div class="example">
<a name="idp8943168"></a><p class="title"><b>Example 12. A simple expression</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="number">42</span> <span class="gtkdoc opt">*</span> <span class="number">2</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<div class="example">
<a name="idp6663856"></a><p class="title"><b>Example 13. A more complicated expression</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc opt">(</span>foo <span class="gtkdoc opt">+</span> <span class="number">1</span><span class="gtkdoc opt">) *</span> <span class="number">3</span> <span class="gtkdoc opt">-</span> <span class="number">2</span> <span class="gtkdoc opt">*</span> bar</pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<div class="example">
<a name="idp11555488"></a><p class="title"><b>Example 14. An expression with indexes</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting">array<span class="gtkdoc opt">[</span>array<span class="gtkdoc opt">[</span>idx <span class="gtkdoc opt">+</span> <span class="number">1</span><span class="gtkdoc opt">]] *</span> array<span class="gtkdoc opt">[</span>idx<span class="gtkdoc opt">]</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
Of course, the latter examples supposes that the environment contains the
variables <em class="parameter"><code>foo</code></em>, <em class="parameter"><code>bar</code></em>, <em class="parameter"><code>array</code></em> and <em class="parameter"><code>idx</code></em>, and that they contains appropriate
values for latter evaluation.
</p>
</div>
<div class="refsect1">
<a name="ctpl-CtplLexerExpr.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CTPL-LEXER-EXPR-ERROR:CAPS"></a><h3>CTPL_LEXER_EXPR_ERROR</h3>
<pre class="programlisting">#define CTPL_LEXER_EXPR_ERROR (ctpl_lexer_expr_error_quark ())
</pre>
<p>
Error domain of <a class="link" href="ctpl-CtplLexerExpr.html#CtplLexerExprError" title="enum CtplLexerExprError"><span class="type">CtplLexerExprError</span></a>.
</p>
</div>
<hr>
<div class="refsect2">
<a name="CtplLexerExprError"></a><h3>enum CtplLexerExprError</h3>
<pre class="programlisting">typedef enum _CtplLexerExprError
{
CTPL_LEXER_EXPR_ERROR_MISSING_OPERAND,
CTPL_LEXER_EXPR_ERROR_MISSING_OPERATOR,
CTPL_LEXER_EXPR_ERROR_SYNTAX_ERROR,
CTPL_LEXER_EXPR_ERROR_FAILED
} CtplLexerExprError;
</pre>
<p>
Error codes that lexing functions can throw, from the <a class="link" href="ctpl-CtplLexerExpr.html#CTPL-LEXER-EXPR-ERROR:CAPS" title="CTPL_LEXER_EXPR_ERROR"><code class="literal">CTPL_LEXER_EXPR_ERROR</code></a>
domain.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="CTPL-LEXER-EXPR-ERROR-MISSING-OPERAND:CAPS"></a><span class="term"><code class="literal">CTPL_LEXER_EXPR_ERROR_MISSING_OPERAND</code></span></p></td>
<td>An operand is missing
</td>
</tr>
<tr>
<td><p><a name="CTPL-LEXER-EXPR-ERROR-MISSING-OPERATOR:CAPS"></a><span class="term"><code class="literal">CTPL_LEXER_EXPR_ERROR_MISSING_OPERATOR</code></span></p></td>
<td>An operator is missing
</td>
</tr>
<tr>
<td><p><a name="CTPL-LEXER-EXPR-ERROR-SYNTAX-ERROR:CAPS"></a><span class="term"><code class="literal">CTPL_LEXER_EXPR_ERROR_SYNTAX_ERROR</code></span></p></td>
<td>The expression has invalid syntax
</td>
</tr>
<tr>
<td><p><a name="CTPL-LEXER-EXPR-ERROR-FAILED:CAPS"></a><span class="term"><code class="literal">CTPL_LEXER_EXPR_ERROR_FAILED</code></span></p></td>
<td>An error occurred without any
precision on what failed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="ctpl-lexer-expr-lex"></a><h3>ctpl_lexer_expr_lex ()</h3>
<pre class="programlisting"><a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * ctpl_lexer_expr_lex (<em class="parameter"><code><a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> *stream</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Tries to lex the expression in <em class="parameter"><code>stream</code></em>.
If you want to lex a <a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> that (may) hold other data after the
expression, see <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex-full" title="ctpl_lexer_expr_lex_full ()"><code class="function">ctpl_lexer_expr_lex_full()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>A <a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> from where read the expression</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Return location for errors, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore them.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new <a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="type">CtplTokenExpr</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="ctpl-lexer-expr-lex-full"></a><h3>ctpl_lexer_expr_lex_full ()</h3>
<pre class="programlisting"><a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * ctpl_lexer_expr_lex_full (<em class="parameter"><code><a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a> *stream</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> lex_all</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Tries to lex the expression in <em class="parameter"><code>stream</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>A <a class="link" href="ctpl-CtplInputStream.html#CtplInputStream" title="CtplInputStream"><span class="type">CtplInputStream</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lex_all</code></em> :</span></p></td>
<td>Whether to lex <em class="parameter"><code>stream</code></em> until EOF or until the end of a valid
expression. This is useful for expressions inside other data.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Return location for errors, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore them.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new <a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="type">CtplTokenExpr</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="ctpl-lexer-expr-lex-string"></a><h3>ctpl_lexer_expr_lex_string ()</h3>
<pre class="programlisting"><a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="returnvalue">CtplTokenExpr</span></a> * ctpl_lexer_expr_lex_string (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *expr</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gssize"><span class="type">gssize</span></a> len</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>
Tries to lex the expression in <em class="parameter"><code>expr</code></em>.
See <a class="link" href="ctpl-CtplLexerExpr.html#ctpl-lexer-expr-lex" title="ctpl_lexer_expr_lex ()"><code class="function">ctpl_lexer_expr_lex()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>expr</code></em> :</span></p></td>
<td>An expression</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>Length of <em class="parameter"><code>expr</code></em> or -1 to read the whole string</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>Return location for errors, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore them</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new <a class="link" href="ctpl-CtplToken.html#CtplTokenExpr" title="CtplTokenExpr"><span class="type">CtplTokenExpr</span></a> or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error.</td>
</tr>
</tbody>
</table></div>
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