File: C:/Ruby27-x64/share/doc/ruby/html/Fiddle/CParser.html
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<!-- Method Quickref -->
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<h3>Methods</h3>
<ul class="link-list" role="directory">
<li ><a href="#method-i-compact">#compact</a>
<li ><a href="#method-i-parse_ctype">#parse_ctype</a>
<li ><a href="#method-i-parse_signature">#parse_signature</a>
<li ><a href="#method-i-parse_struct_signature">#parse_struct_signature</a>
<li ><a href="#method-i-split_arguments">#split_arguments</a>
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<main role="main" aria-labelledby="module-Fiddle::CParser">
<h1 id="module-Fiddle::CParser" class="module">
module Fiddle::CParser
</h1>
<section class="description">
<p>A mixin that provides methods for parsing C struct and prototype signatures.</p>
<h2 id="module-Fiddle::CParser-label-Example">Example<span><a href="#module-Fiddle::CParser-label-Example">¶</a> <a href="#top">↑</a></span></h2>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'fiddle/import'</span>
<span class="ruby-identifier">include</span> <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">CParser</span>
<span class="ruby-comment">#=> Object</span>
<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-string">'int'</span>)
<span class="ruby-comment">#=> Fiddle::TYPE_INT</span>
<span class="ruby-identifier">parse_struct_signature</span>([<span class="ruby-string">'int i'</span>, <span class="ruby-string">'char c'</span>])
<span class="ruby-comment">#=> [[Fiddle::TYPE_INT, Fiddle::TYPE_CHAR], ["i", "c"]]</span>
<span class="ruby-identifier">parse_signature</span>(<span class="ruby-string">'double sum(double, double)'</span>)
<span class="ruby-comment">#=> ["sum", Fiddle::TYPE_DOUBLE, [Fiddle::TYPE_DOUBLE, Fiddle::TYPE_DOUBLE]]</span>
</pre>
</section>
<section id="5Buntitled-5D" class="documentation-section">
<section id="public-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Public Instance Methods</h3>
</header>
<div id="method-i-parse_ctype" class="method-detail ">
<div class="method-heading">
<span class="method-name">parse_ctype</span><span
class="method-args">(ty, tymap=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Given a <a href="../String.html"><code>String</code></a> of C type <code>ty</code>, returns the corresponding <a href="../Fiddle.html"><code>Fiddle</code></a> constant.</p>
<p><code>ty</code> can also accept an <a href="../Array.html"><code>Array</code></a> of C type Strings, and will be returned in a corresponding <a href="../Array.html"><code>Array</code></a>.</p>
<p>If <a href="../Hash.html"><code>Hash</code></a> <code>tymap</code> is provided, <code>ty</code> is expected to be the key, and the value will be the C type to be looked up.</p>
<p>Example:</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'fiddle/import'</span>
<span class="ruby-identifier">include</span> <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">CParser</span>
<span class="ruby-comment">#=> Object</span>
<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-string">'int'</span>)
<span class="ruby-comment">#=> Fiddle::TYPE_INT</span>
<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-string">'double diff'</span>)
<span class="ruby-comment">#=> Fiddle::TYPE_DOUBLE</span>
<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-string">'unsigned char byte'</span>)
<span class="ruby-comment">#=> -Fiddle::TYPE_CHAR</span>
<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-string">'const char* const argv[]'</span>)
<span class="ruby-comment">#=> -Fiddle::TYPE_VOIDP</span>
</pre>
<div class="method-source-code" id="parse_ctype-source">
<pre><span class="ruby-comment"># File ext/fiddle/lib/fiddle/cparser.rb, line 124</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">parse_ctype</span>(<span class="ruby-identifier">ty</span>, <span class="ruby-identifier">tymap</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">tymap</span> <span class="ruby-operator">||=</span> {}
<span class="ruby-keyword">case</span> <span class="ruby-identifier">ty</span>
<span class="ruby-keyword">when</span> <span class="ruby-constant">Array</span>
<span class="ruby-keyword">return</span> [<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">ty</span>[<span class="ruby-value">0</span>], <span class="ruby-identifier">tymap</span>), <span class="ruby-identifier">ty</span>[<span class="ruby-value">1</span>]]
<span class="ruby-keyword">when</span> <span class="ruby-string">'void'</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_VOID</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:(?:signed\s+)?long\s+long(?:\s+int\s+)?|int64_t)(?:\s+\w+)?$/</span>
<span class="ruby-keyword">if</span>( <span class="ruby-keyword">defined?</span>(<span class="ruby-constant">TYPE_LONG_LONG</span>) )
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_LONG_LONG</span>
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span>(<span class="ruby-constant">RuntimeError</span>, <span class="ruby-node">"unsupported type: #{ty}"</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:unsigned\s+long\s+long(?:\s+int\s+)?|uint64_t)(?:\s+\w+)?$/</span>
<span class="ruby-keyword">if</span>( <span class="ruby-keyword">defined?</span>(<span class="ruby-constant">TYPE_LONG_LONG</span>) )
<span class="ruby-keyword">return</span> <span class="ruby-operator">-</span><span class="ruby-constant">TYPE_LONG_LONG</span>
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span>(<span class="ruby-constant">RuntimeError</span>, <span class="ruby-node">"unsupported type: #{ty}"</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:signed\s+)?long(?:\s+int\s+)?(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_LONG</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^unsigned\s+long(?:\s+int\s+)?(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-operator">-</span><span class="ruby-constant">TYPE_LONG</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:signed\s+)?int(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_INT</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:unsigned\s+int|uint)(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-operator">-</span><span class="ruby-constant">TYPE_INT</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:signed\s+)?short(?:\s+int\s+)?(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_SHORT</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^unsigned\s+short(?:\s+int\s+)?(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-operator">-</span><span class="ruby-constant">TYPE_SHORT</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:signed\s+)?char(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_CHAR</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^unsigned\s+char(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-operator">-</span><span class="ruby-constant">TYPE_CHAR</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^float(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_FLOAT</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^double(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_DOUBLE</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^size_t(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_SIZE_T</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^ssize_t(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_SSIZE_T</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^ptrdiff_t(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_PTRDIFF_T</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^intptr_t(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_INTPTR_T</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^uintptr_t(?:\s+\w+)?$/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_UINTPTR_T</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/\*/</span>, <span class="ruby-regexp">/\[[\s\d]*\]/</span>
<span class="ruby-keyword">return</span> <span class="ruby-constant">TYPE_VOIDP</span>
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">ty</span> = <span class="ruby-identifier">ty</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">' '</span>, <span class="ruby-value">2</span>)[<span class="ruby-value">0</span>]
<span class="ruby-keyword">if</span>( <span class="ruby-identifier">tymap</span>[<span class="ruby-identifier">ty</span>] )
<span class="ruby-keyword">return</span> <span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">tymap</span>[<span class="ruby-identifier">ty</span>], <span class="ruby-identifier">tymap</span>)
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span>(<span class="ruby-constant">DLError</span>, <span class="ruby-node">"unknown type: #{ty}"</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-parse_signature" class="method-detail ">
<div class="method-heading">
<span class="method-name">parse_signature</span><span
class="method-args">(signature, tymap=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Parses a C prototype signature</p>
<p>If <a href="../Hash.html"><code>Hash</code></a> <code>tymap</code> is provided, the return value and the arguments from the <code>signature</code> are expected to be keys, and the value will be the C type to be looked up.</p>
<p>Example:</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'fiddle/import'</span>
<span class="ruby-identifier">include</span> <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">CParser</span>
<span class="ruby-comment">#=> Object</span>
<span class="ruby-identifier">parse_signature</span>(<span class="ruby-string">'double sum(double, double)'</span>)
<span class="ruby-comment">#=> ["sum", Fiddle::TYPE_DOUBLE, [Fiddle::TYPE_DOUBLE, Fiddle::TYPE_DOUBLE]]</span>
<span class="ruby-identifier">parse_signature</span>(<span class="ruby-string">'void update(void (*cb)(int code))'</span>)
<span class="ruby-comment">#=> ["update", Fiddle::TYPE_VOID, [Fiddle::TYPE_VOIDP]]</span>
<span class="ruby-identifier">parse_signature</span>(<span class="ruby-string">'char (*getbuffer(void))[80]'</span>)
<span class="ruby-comment">#=> ["getbuffer", Fiddle::TYPE_VOIDP, []]</span>
</pre>
<div class="method-source-code" id="parse_signature-source">
<pre><span class="ruby-comment"># File ext/fiddle/lib/fiddle/cparser.rb, line 84</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">parse_signature</span>(<span class="ruby-identifier">signature</span>, <span class="ruby-identifier">tymap</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-identifier">tymap</span> <span class="ruby-operator">||=</span> {}
<span class="ruby-keyword">case</span> <span class="ruby-identifier">compact</span>(<span class="ruby-identifier">signature</span>)
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^(?:[\w\*\s]+)\(\*(\w+)\((.*?)\)\)(?:\[\w*\]|\(.*?\));?$/</span>
<span class="ruby-identifier">func</span>, <span class="ruby-identifier">args</span> = <span class="ruby-node">$1</span>, <span class="ruby-node">$2</span>
<span class="ruby-keyword">return</span> [<span class="ruby-identifier">func</span>, <span class="ruby-constant">TYPE_VOIDP</span>, <span class="ruby-identifier">split_arguments</span>(<span class="ruby-identifier">args</span>).<span class="ruby-identifier">collect</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">arg</span><span class="ruby-operator">|</span> <span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">arg</span>, <span class="ruby-identifier">tymap</span>)}]
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^([\w\*\s]+[\*\s])(\w+)\((.*?)\);?$/</span>
<span class="ruby-identifier">ret</span>, <span class="ruby-identifier">func</span>, <span class="ruby-identifier">args</span> = <span class="ruby-node">$1</span>.<span class="ruby-identifier">strip</span>, <span class="ruby-node">$2</span>, <span class="ruby-node">$3</span>
<span class="ruby-keyword">return</span> [<span class="ruby-identifier">func</span>, <span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">ret</span>, <span class="ruby-identifier">tymap</span>), <span class="ruby-identifier">split_arguments</span>(<span class="ruby-identifier">args</span>).<span class="ruby-identifier">collect</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">arg</span><span class="ruby-operator">|</span> <span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">arg</span>, <span class="ruby-identifier">tymap</span>)}]
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span>(<span class="ruby-constant">RuntimeError</span>,<span class="ruby-node">"can't parse the function prototype: #{signature}"</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-parse_struct_signature" class="method-detail ">
<div class="method-heading">
<span class="method-name">parse_struct_signature</span><span
class="method-args">(signature, tymap=nil)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<p>Parses a C struct's members</p>
<p>Example:</p>
<pre class="ruby"><span class="ruby-identifier">require</span> <span class="ruby-string">'fiddle/import'</span>
<span class="ruby-identifier">include</span> <span class="ruby-constant">Fiddle</span><span class="ruby-operator">::</span><span class="ruby-constant">CParser</span>
<span class="ruby-comment">#=> Object</span>
<span class="ruby-identifier">parse_struct_signature</span>([<span class="ruby-string">'int i'</span>, <span class="ruby-string">'char c'</span>])
<span class="ruby-comment">#=> [[Fiddle::TYPE_INT, Fiddle::TYPE_CHAR], ["i", "c"]]</span>
<span class="ruby-identifier">parse_struct_signature</span>([<span class="ruby-string">'char buffer[80]'</span>])
<span class="ruby-comment">#=> [[[Fiddle::TYPE_CHAR, 80]], ["buffer"]]</span>
</pre>
<div class="method-source-code" id="parse_struct_signature-source">
<pre><span class="ruby-comment"># File ext/fiddle/lib/fiddle/cparser.rb, line 35</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">parse_struct_signature</span>(<span class="ruby-identifier">signature</span>, <span class="ruby-identifier">tymap</span>=<span class="ruby-keyword">nil</span>)
<span class="ruby-keyword">if</span> <span class="ruby-identifier">signature</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">String</span>)
<span class="ruby-identifier">signature</span> = <span class="ruby-identifier">split_arguments</span>(<span class="ruby-identifier">signature</span>, <span class="ruby-regexp">/[,;]/</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">mems</span> = []
<span class="ruby-identifier">tys</span> = []
<span class="ruby-identifier">signature</span>.<span class="ruby-identifier">each</span>{<span class="ruby-operator">|</span><span class="ruby-identifier">msig</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">msig</span> = <span class="ruby-identifier">compact</span>(<span class="ruby-identifier">msig</span>)
<span class="ruby-keyword">case</span> <span class="ruby-identifier">msig</span>
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^[\w\*\s]+[\*\s](\w+)$/</span>
<span class="ruby-identifier">mems</span>.<span class="ruby-identifier">push</span>(<span class="ruby-node">$1</span>)
<span class="ruby-identifier">tys</span>.<span class="ruby-identifier">push</span>(<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">msig</span>, <span class="ruby-identifier">tymap</span>))
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^[\w\*\s]+\(\*(\w+)\)\(.*?\)$/</span>
<span class="ruby-identifier">mems</span>.<span class="ruby-identifier">push</span>(<span class="ruby-node">$1</span>)
<span class="ruby-identifier">tys</span>.<span class="ruby-identifier">push</span>(<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-identifier">msig</span>, <span class="ruby-identifier">tymap</span>))
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^([\w\*\s]+[\*\s])(\w+)\[(\d+)\]$/</span>
<span class="ruby-identifier">mems</span>.<span class="ruby-identifier">push</span>(<span class="ruby-node">$2</span>)
<span class="ruby-identifier">tys</span>.<span class="ruby-identifier">push</span>([<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-node">$1</span>.<span class="ruby-identifier">strip</span>, <span class="ruby-identifier">tymap</span>), <span class="ruby-node">$3</span>.<span class="ruby-identifier">to_i</span>])
<span class="ruby-keyword">when</span> <span class="ruby-regexp">/^([\w\*\s]+)\[(\d+)\](\w+)$/</span>
<span class="ruby-identifier">mems</span>.<span class="ruby-identifier">push</span>(<span class="ruby-node">$3</span>)
<span class="ruby-identifier">tys</span>.<span class="ruby-identifier">push</span>([<span class="ruby-identifier">parse_ctype</span>(<span class="ruby-node">$1</span>.<span class="ruby-identifier">strip</span>, <span class="ruby-identifier">tymap</span>), <span class="ruby-node">$2</span>.<span class="ruby-identifier">to_i</span>])
<span class="ruby-keyword">else</span>
<span class="ruby-identifier">raise</span>(<span class="ruby-constant">RuntimeError</span>,<span class="ruby-node">"can't parse the struct member: #{msig}"</span>)
<span class="ruby-keyword">end</span>
}
<span class="ruby-keyword">return</span> <span class="ruby-identifier">tys</span>, <span class="ruby-identifier">mems</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
<section id="private-instance-5Buntitled-5D-method-details" class="method-section">
<header>
<h3>Private Instance Methods</h3>
</header>
<div id="method-i-compact" class="method-detail ">
<div class="method-heading">
<span class="method-name">compact</span><span
class="method-args">(signature)</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="compact-source">
<pre><span class="ruby-comment"># File ext/fiddle/lib/fiddle/cparser.rb, line 192</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">compact</span>(<span class="ruby-identifier">signature</span>)
<span class="ruby-identifier">signature</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/\s+/</span>, <span class="ruby-string">' '</span>).<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/\s*([\(\)\[\]\*,;])\s*/</span>, <span class="ruby-string">'\1'</span>).<span class="ruby-identifier">strip</span>
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
<div id="method-i-split_arguments" class="method-detail ">
<div class="method-heading">
<span class="method-name">split_arguments</span><span
class="method-args">(arguments, sep=',')</span>
<span class="method-click-advice">click to toggle source</span>
</div>
<div class="method-description">
<div class="method-source-code" id="split_arguments-source">
<pre><span class="ruby-comment"># File ext/fiddle/lib/fiddle/cparser.rb, line 187</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">split_arguments</span>(<span class="ruby-identifier">arguments</span>, <span class="ruby-identifier">sep</span>=<span class="ruby-string">','</span>)
<span class="ruby-keyword">return</span> [] <span class="ruby-keyword">if</span> <span class="ruby-identifier">arguments</span>.<span class="ruby-identifier">strip</span> <span class="ruby-operator">==</span> <span class="ruby-string">'void'</span>
<span class="ruby-identifier">arguments</span>.<span class="ruby-identifier">scan</span>(<span class="ruby-regexp">/([\w\*\s]+\(\*\w*\)\(.*?\)|[\w\*\s\[\]]+)(?:#{sep}\s*|$)/</span>).<span class="ruby-identifier">collect</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">m</span><span class="ruby-operator">|</span> <span class="ruby-identifier">m</span>[<span class="ruby-value">0</span>]}
<span class="ruby-keyword">end</span></pre>
</div>
</div>
</div>
</section>
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