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example_expr_full_8c-example.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<title>Sagui library: example_expr_full.c</title>
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<div class="headertitle"><div class="title">example_expr_full.c</div></div>
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<p>Simple example using the mathematical expression evaluator and its features.</p>
<div class="fragment"><div class="line"><span class="comment">/* _</span></div>
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<div class="line"><span class="comment"> * |___/</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Cross-platform library which helps to develop web servers or frameworks.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Copyright (C) 2016-2020 Silvio Clecio <silvioprog@gmail.com></span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Sagui library is free software; you can redistribute it and/or</span></div>
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<div class="line"><span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span></div>
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<div class="line"><span class="comment"> */</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <math.h></span></div>
<div class="line"><span class="preprocessor">#include <<a class="code" href="sagui_8h.html">sagui.h</a>></span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define DUMMY_EXPR \</span></div>
<div class="line"><span class="preprocessor"> "$(sum, $1 + $2), x = 2.3, y = 4.5, mul(6.7, sum(x, y)) + 0.11"</span></div>
<div class="line"> </div>
<div class="line"><span class="comment">/* NOTE: Error checking has been omitted to make it clear. */</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">double</span> my_mul(__SG_UNUSED <span class="keywordtype">void</span> *cls, <span class="keyword">struct</span> <a id="_a0" name="_a0"></a><a class="code hl_struct" href="structsg__expr__argument.html">sg_expr_argument</a> *args,</div>
<div class="line"> __SG_UNUSED <span class="keyword">const</span> <span class="keywordtype">char</span> *identifier) {</div>
<div class="line"> <span class="keywordflow">if</span> (!args)</div>
<div class="line"> <span class="keywordflow">return</span> NAN;</div>
<div class="line"> <span class="keywordflow">return</span> <a id="a1" name="a1"></a><a class="code hl_function" href="group__sg__expr.html#gacc0947d3507b46be2e38ff0bdeae4138">sg_expr_arg</a>(args, 0) * <a class="code hl_function" href="group__sg__expr.html#gacc0947d3507b46be2e38ff0bdeae4138">sg_expr_arg</a>(args, 1);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keyword">const</span> <span class="keywordtype">char</span> *argv[]) {</div>
<div class="line"> <span class="keyword">struct </span><a id="_a2" name="_a2"></a><a class="code hl_struct" href="structsg__expr__extension.html">sg_expr_extension</a> extensions[] = {</div>
<div class="line"> {.<a id="a3" name="a3"></a><a class="code hl_variable" href="structsg__expr__extension.html#aa393780e15c6ff7fccf71755336dc344">func</a> = my_mul, .identifier = <span class="stringliteral">"mul"</span>, .cls = NULL},</div>
<div class="line"> {.func = NULL, .identifier = NULL, .cls = NULL},</div>
<div class="line"> };</div>
<div class="line"> <span class="keyword">struct </span><a id="_a4" name="_a4"></a><a class="code hl_struct" href="structsg__expr.html">sg_expr</a> *expr;</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *s = argc == 2 ? argv[1] : DUMMY_EXPR;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"> expr = <a id="a5" name="a5"></a><a class="code hl_function" href="group__sg__expr.html#ga510eeffdf7ce30732f8369e3aa1b6cb2">sg_expr_new</a>();</div>
<div class="line"> ret = <a id="a6" name="a6"></a><a class="code hl_function" href="group__sg__expr.html#ga10c2f1e91cc8ddcb40fa501939a9cfe0">sg_expr_compile</a>(expr, s, strlen(s), extensions);</div>
<div class="line"> <span class="keywordflow">if</span> (ret == 0)</div>
<div class="line"> printf(<span class="stringliteral">"Result: %f\n"</span>, <a id="a7" name="a7"></a><a class="code hl_function" href="group__sg__expr.html#gaacec551e0ffe9f39877b7500b5c6d606">sg_expr_eval</a>(expr));</div>
<div class="line"> <span class="keywordflow">else</span> {</div>
<div class="line"> printf(<span class="stringliteral">"%s: %s"</span>, s, <a id="a8" name="a8"></a><a class="code hl_function" href="group__sg__expr.html#ga9b4f27b21ed16b435105439bb60a8cfd">sg_expr_strerror</a>(expr));</div>
<div class="line"> printf(<span class="stringliteral">"%*s^--- Error near here.\n"</span>, <a id="a9" name="a9"></a><a class="code hl_function" href="group__sg__expr.html#gababbdaf2835daec5b295309205fca28d">sg_expr_near</a>(expr), <span class="stringliteral">""</span>);</div>
<div class="line"> }</div>
<div class="line"> <a id="a10" name="a10"></a><a class="code hl_function" href="group__sg__expr.html#ga2ac47b719be879f1e19662c3076b12b6">sg_expr_free</a>(expr);</div>
<div class="line"> <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
<div class="ttc" id="agroup__sg__expr_html_ga10c2f1e91cc8ddcb40fa501939a9cfe0"><div class="ttname"><a href="group__sg__expr.html#ga10c2f1e91cc8ddcb40fa501939a9cfe0">sg_expr_compile</a></div><div class="ttdeci">int sg_expr_compile(struct sg_expr *expr, const char *str, size_t len, struct sg_expr_extension *extensions)</div></div>
<div class="ttc" id="agroup__sg__expr_html_ga2ac47b719be879f1e19662c3076b12b6"><div class="ttname"><a href="group__sg__expr.html#ga2ac47b719be879f1e19662c3076b12b6">sg_expr_free</a></div><div class="ttdeci">void sg_expr_free(struct sg_expr *expr)</div></div>
<div class="ttc" id="agroup__sg__expr_html_ga510eeffdf7ce30732f8369e3aa1b6cb2"><div class="ttname"><a href="group__sg__expr.html#ga510eeffdf7ce30732f8369e3aa1b6cb2">sg_expr_new</a></div><div class="ttdeci">struct sg_expr * sg_expr_new(void) __attribute__((malloc))</div></div>
<div class="ttc" id="agroup__sg__expr_html_ga9b4f27b21ed16b435105439bb60a8cfd"><div class="ttname"><a href="group__sg__expr.html#ga9b4f27b21ed16b435105439bb60a8cfd">sg_expr_strerror</a></div><div class="ttdeci">const char * sg_expr_strerror(struct sg_expr *expr)</div></div>
<div class="ttc" id="agroup__sg__expr_html_gaacec551e0ffe9f39877b7500b5c6d606"><div class="ttname"><a href="group__sg__expr.html#gaacec551e0ffe9f39877b7500b5c6d606">sg_expr_eval</a></div><div class="ttdeci">double sg_expr_eval(struct sg_expr *expr)</div></div>
<div class="ttc" id="agroup__sg__expr_html_gababbdaf2835daec5b295309205fca28d"><div class="ttname"><a href="group__sg__expr.html#gababbdaf2835daec5b295309205fca28d">sg_expr_near</a></div><div class="ttdeci">int sg_expr_near(struct sg_expr *expr)</div></div>
<div class="ttc" id="agroup__sg__expr_html_gacc0947d3507b46be2e38ff0bdeae4138"><div class="ttname"><a href="group__sg__expr.html#gacc0947d3507b46be2e38ff0bdeae4138">sg_expr_arg</a></div><div class="ttdeci">double sg_expr_arg(struct sg_expr_argument *args, int index)</div></div>
<div class="ttc" id="asagui_8h_html"><div class="ttname"><a href="sagui_8h.html">sagui.h</a></div></div>
<div class="ttc" id="astructsg__expr__argument_html"><div class="ttname"><a href="structsg__expr__argument.html">sg_expr_argument</a></div></div>
<div class="ttc" id="astructsg__expr__extension_html"><div class="ttname"><a href="structsg__expr__extension.html">sg_expr_extension</a></div><div class="ttdef"><b>Definition</b> sagui.h:2262</div></div>
<div class="ttc" id="astructsg__expr__extension_html_aa393780e15c6ff7fccf71755336dc344"><div class="ttname"><a href="structsg__expr__extension.html#aa393780e15c6ff7fccf71755336dc344">sg_expr_extension::func</a></div><div class="ttdeci">sg_expr_func func</div><div class="ttdef"><b>Definition</b> sagui.h:2265</div></div>
<div class="ttc" id="astructsg__expr_html"><div class="ttname"><a href="structsg__expr.html">sg_expr</a></div></div>
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