2011-10-14 08:34:53 +00:00
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2011-10-18 19:46:05 +00:00
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<title>dyaml.representer - D:YAML 0.3 API documentation</title>
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2011-10-14 08:34:53 +00:00
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2011-10-18 19:46:05 +00:00
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<img id="logo" alt="D:YAML logo" src="images/logo.png"><a id="main-heading" href="index.html">D:YAML 0.3 API documentation</a>
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2011-10-14 08:34:53 +00:00
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2011-10-29 18:43:30 +00:00
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<div id="content">
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<h1>dyaml.representer</h1>
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<!-- Generated by Ddoc from dyaml/representer.d -->
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2011-10-15 14:31:23 +00:00
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<p>YAML node representer. Prepares YAML nodes for output. A tutorial can be
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found <a href="../tutorials/custom_types.html">here</a>.
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</p>
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<p>Code based on <a href="http://www.pyyaml.org">PyYAML</a>.</p>
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<dl><dt class="d_decl">class <a name="RepresenterException"></a><span class="ddoc_psymbol">RepresenterException</span>: dyaml.exception.YAMLException;
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</dt>
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<dd><p>Exception thrown on Representer errors.</p>
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</dd>
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<dt class="d_decl">class <a name="Representer"></a><span class="ddoc_psymbol">Representer</span>;
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</dt>
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<dd><p>Represents YAML nodes of various data types as scalar, sequence and mapping nodes ready for output.
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</p>
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<p>This class is used to add support for dumping of custom data types.
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<br>
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It can also override default node formatting styles for output.</p>
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<dl><dt class="d_decl">this(bool <b>useDefaultRepresenters</b> = true);
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</dt>
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<dd><p>Construct a Representer.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>bool <b>useDefaultRepresenters</b></td>
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<td valign=top>Use default representer functions
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for default YAML types? This can be
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disabled to use custom representer
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functions for default types.</td></tr>
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</table></div>
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2011-10-27 21:13:14 +00:00
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</dd>
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<dt class="d_decl">@property void <a name="defaultScalarStyle"></a><span class="ddoc_psymbol">defaultScalarStyle</span>(ScalarStyle <b>style</b>);
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</dt>
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<dd><p>Set default style for scalars. Invalid means the style is chosen automatically.</p>
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</dd>
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<dt class="d_decl">@property void <a name="defaultCollectionStyle"></a><span class="ddoc_psymbol">defaultCollectionStyle</span>(CollectionStyle <b>style</b>);
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</dt>
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<dd><p>Set default style for collections. Invalid means the style is chosen automatically. </p>
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</dd>
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<dt class="d_decl">void <a name="addRepresenter"></a><span class="ddoc_psymbol">addRepresenter</span>(T)(Node function(ref Node, Representer) <b>representer</b>);
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</dt>
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<dd><p>Add a function to represent nodes with a specific data type.
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</p>
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<p>The representer function takes references to a Node storing the data
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type and to the Representer. It returns the represented node and may
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throw a RepresenterException. See the example for more information.
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<br>
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Only one function may be specified for one data type. Default data
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types already have representer functions unless disabled in the
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Representer constructor.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>representer</td>
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<td valign=top>Representer function to add.</td></tr>
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</table></div>
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<b>Examples:</b><div class="pbr">Representing a simple struct:
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<pre class="d_code"> <span class="d_keyword">import</span> std.string;
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<span class="d_keyword">import</span> yaml;
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<span class="d_keyword">struct</span> MyStruct
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{
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<span class="d_keyword">int</span> x, y, z;
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}
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Node representMyStruct(<span class="d_keyword">ref</span> Node node, Representer representer)
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{
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<span class="d_comment">//The node is guaranteed to be MyStruct as we add representer for MyStruct.
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</span> <span class="d_keyword">auto</span> value = node.as!MyStruct;
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<span class="d_comment">//Using custom scalar format, x:y:z.
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</span> <span class="d_keyword">auto</span> scalar = format(value.x, <span class="d_string">":"</span>, value.y, <span class="d_string">":"</span>, value.z);
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<span class="d_comment">//Representing as a scalar, with custom tag to specify this data type.
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</span> <span class="d_keyword">return</span> representer.representScalar(<span class="d_string">"!mystruct.tag"</span>, scalar);
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}
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<span class="d_keyword">void</span> main()
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{
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<span class="d_keyword">auto</span> dumper = Dumper(<span class="d_string">"file.yaml"</span>);
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<span class="d_keyword">auto</span> representer = <span class="d_keyword">new</span> Representer;
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representer.<span class="d_psymbol">addRepresenter</span>!MyStruct(&representMyStruct);
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dumper.representer = representer;
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dumper.dump(Node(MyStruct(1,2,3)));
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}
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</pre>
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Representing a class:
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<pre class="d_code"> <span class="d_keyword">import</span> std.string;
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<span class="d_keyword">import</span> yaml;
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<span class="d_keyword">class</span> MyClass
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{
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<span class="d_keyword">int</span> x, y, z;
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<span class="d_keyword">this</span>(<span class="d_keyword">int</span> x, <span class="d_keyword">int</span> y, <span class="d_keyword">int</span> z)
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{
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<span class="d_keyword">this</span>.x = x;
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<span class="d_keyword">this</span>.y = y;
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<span class="d_keyword">this</span>.z = z;
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}
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<span class="d_comment">///We need custom opEquals for node equality, as default opEquals compares references.
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</span> <span class="d_keyword">override</span> <span class="d_keyword">bool</span> opEquals(Object rhs)
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{
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<span class="d_keyword">if</span>(<span class="d_keyword">typeid</span>(rhs) != <span class="d_keyword">typeid</span>(MyClass)){<span class="d_keyword">return</span> <span class="d_keyword">false</span>;}
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<span class="d_keyword">auto</span> t = <span class="d_keyword">cast</span>(MyClass)rhs;
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<span class="d_keyword">return</span> x == t.x && y == t.y && z == t.z;
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}
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2011-10-22 15:06:32 +00:00
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<span class="d_comment">///Useful for Node.as!string .
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</span> <span class="d_keyword">override</span> string toString()
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{
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<span class="d_keyword">return</span> format(<span class="d_string">"MyClass("), x, <span class="d_string">", "</span>, y, <span class="d_string">", "</span>, z, <span class="d_string">"</span>"</span>);
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}
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}
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<span class="d_comment">//Same as representMyStruct.
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</span> Node representMyClass(<span class="d_keyword">ref</span> Node node, Representer representer)
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{
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<span class="d_comment">//The node is guaranteed to be MyClass as we add representer for MyClass.
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</span> <span class="d_keyword">auto</span> value = node.as!MyClass;
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<span class="d_comment">//Using custom scalar format, x:y:z.
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</span> <span class="d_keyword">auto</span> scalar = format(value.x, <span class="d_string">":"</span>, value.y, <span class="d_string">":"</span>, value.z);
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<span class="d_comment">//Representing as a scalar, with custom tag to specify this data type.
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</span> <span class="d_keyword">return</span> representer.representScalar(<span class="d_string">"!myclass.tag"</span>, scalar);
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}
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<span class="d_keyword">void</span> main()
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{
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<span class="d_keyword">auto</span> dumper = Dumper(<span class="d_string">"file.yaml"</span>);
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<span class="d_keyword">auto</span> representer = <span class="d_keyword">new</span> Representer;
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representer.<span class="d_psymbol">addRepresenter</span>!MyClass(&representMyClass);
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dumper.representer = representer;
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dumper.dump(Node(<span class="d_keyword">new</span> MyClass(1,2,3)));
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}
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</pre>
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</div>
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</dd>
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<dt class="d_decl">Node <a name="representScalar"></a><span class="ddoc_psymbol">representScalar</span>(string <b>tag</b>, string <b>scalar</b>, ScalarStyle <b>style</b> = (ScalarStyle).Invalid);
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</dt>
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<dd><p>Represent a scalar with specified tag.
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</p>
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<p>This is used by representer functions that produce scalars.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>string <b>tag</b></td>
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<td valign=top>Tag of the scalar.</td></tr>
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<tr><td valign=top>string <b>scalar</b></td>
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<td valign=top>Scalar value.</td></tr>
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<tr><td valign=top>ScalarStyle <b>style</b></td>
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<td valign=top>Style of the scalar. If invalid, default style will be used.
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If the node was loaded before, previous style will always be used.</td></tr>
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</table></div>
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<b>Returns:</b><div class="pbr">The represented node.
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</div>
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<p><b>Example:</b><br>
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<pre class="d_code"> <span class="d_keyword">struct</span> MyStruct
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{
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<span class="d_keyword">int</span> x, y, z;
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}
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Node representMyStruct(<span class="d_keyword">ref</span> Node node, Representer representer)
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{
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<span class="d_keyword">auto</span> value = node.as!MyStruct;
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<span class="d_keyword">auto</span> <span class="d_param">scalar</span> = format(value.x, <span class="d_string">":"</span>, value.y, <span class="d_string">":"</span>, value.z);
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<span class="d_keyword">return</span> representer.<span class="d_psymbol">representScalar</span>(<span class="d_string">"!mystruct.tag"</span>, <span class="d_param">scalar</span>);
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}
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</pre>
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</p>
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</dd>
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<dt class="d_decl">Node <a name="representSequence"></a><span class="ddoc_psymbol">representSequence</span>(string <b>tag</b>, Node[] <b>sequence</b>, CollectionStyle <b>style</b> = (CollectionStyle).Invalid);
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</dt>
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<dd><p>Represent a sequence with specified tag, representing children first.
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</p>
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<p>This is used by representer functions that produce sequences.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>string <b>tag</b></td>
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<td valign=top>Tag of the <b>sequence</b>.</td></tr>
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<tr><td valign=top>Node[] <b>sequence</b></td>
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<td valign=top>Sequence of nodes.</td></tr>
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<tr><td valign=top>CollectionStyle <b>style</b></td>
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<td valign=top>Style of the sequence. If invalid, default style will be used.
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If the node was loaded before, previous style will always be used.</td></tr>
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</table></div>
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<b>Returns:</b><div class="pbr">The represented node.
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</div>
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<b>Throws:</b><div class="pbr">RepresenterException if a child could not be represented.
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</div>
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<p><b>Example:</b><br>
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<pre class="d_code"> <span class="d_keyword">struct</span> MyStruct
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{
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<span class="d_keyword">int</span> x, y, z;
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}
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Node representMyStruct(<span class="d_keyword">ref</span> Node node, Representer representer)
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{
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<span class="d_keyword">auto</span> value = node.as!MyStruct;
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2011-10-14 08:34:53 +00:00
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<span class="d_keyword">auto</span> nodes = [Node(value.x), Node(value.y), Node(value.z)];
|
2011-10-29 18:43:30 +00:00
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<span class="d_comment">//use flow style
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</span> <span class="d_keyword">return</span> representer.<span class="d_psymbol">representSequence</span>(<span class="d_string">"!mystruct.tag"</span>, nodes,
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CollectionStyle.Flow);
|
2011-10-14 08:34:53 +00:00
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}
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</pre>
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</p>
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</dd>
|
2011-11-16 02:10:29 +00:00
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<dt class="d_decl">Node <a name="representMapping"></a><span class="ddoc_psymbol">representMapping</span>(string <b>tag</b>, Pair[] <b>pairs</b>, CollectionStyle <b>style</b> = (CollectionStyle).Invalid);
|
2011-10-14 08:34:53 +00:00
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</dt>
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<dd><p>Represent a mapping with specified tag, representing children first.
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</p>
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<p>This is used by representer functions that produce mappings.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>string <b>tag</b></td>
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<td valign=top>Tag of the mapping.</td></tr>
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|
<tr><td valign=top>Pair[] <b>pairs</b></td>
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|
<td valign=top>Key-value pairs of the mapping.</td></tr>
|
2011-10-27 21:13:14 +00:00
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|
<tr><td valign=top>CollectionStyle <b>style</b></td>
|
2011-10-29 18:43:30 +00:00
|
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|
<td valign=top>Style of the mapping. If invalid, default style will be used.
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If the node was loaded before, previous style will always be used.</td></tr>
|
2011-10-14 08:34:53 +00:00
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</table></div>
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<b>Returns:</b><div class="pbr">The represented node.
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</div>
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<b>Throws:</b><div class="pbr">RepresenterException if a child could not be represented.
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</div>
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|
<p><b>Example:</b><br>
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|
<pre class="d_code"> <span class="d_keyword">struct</span> MyStruct
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{
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<span class="d_keyword">int</span> x, y, z;
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}
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|
|
Node representMyStruct(<span class="d_keyword">ref</span> Node node, Representer representer)
|
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|
|
{
|
2011-10-22 15:06:32 +00:00
|
|
|
<span class="d_keyword">auto</span> value = node.as!MyStruct;
|
2011-10-14 08:34:53 +00:00
|
|
|
<span class="d_keyword">auto</span> <span class="d_param">pairs</span> = [Node.Pair(<span class="d_string">"x"</span>, value.x),
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|
|
Node.Pair(<span class="d_string">"y"</span>, value.y),
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|
|
Node.Pair(<span class="d_string">"z"</span>, value.z)];
|
|
|
|
|
<span class="d_keyword">return</span> representer.<span class="d_psymbol">representMapping</span>(<span class="d_string">"!mystruct.tag"</span>, <span class="d_param">pairs</span>);
|
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|
}
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</pre>
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</p>
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</dd>
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|
</dl>
|
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|
</dd>
|
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|
<dt class="d_decl">Node <a name="representNull"></a><span class="ddoc_psymbol">representNull</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
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|
|
|
</dt>
|
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|
|
<dd><p>Represent a null node as a null YAML value.</p>
|
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|
</dd>
|
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|
<dt class="d_decl">Node <a name="representString"></a><span class="ddoc_psymbol">representString</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
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|
|
|
</dt>
|
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|
<dd><p>Represent a string node as a string scalar.</p>
|
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|
</dd>
|
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|
<dt class="d_decl">Node <a name="representBytes"></a><span class="ddoc_psymbol">representBytes</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
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|
<dd><p>Represent a bytes node as a binary scalar.</p>
|
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|
|
|
|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representBool"></a><span class="ddoc_psymbol">representBool</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a bool node as a bool scalar.</p>
|
|
|
|
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|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representLong"></a><span class="ddoc_psymbol">representLong</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a long node as an integer scalar.</p>
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representReal"></a><span class="ddoc_psymbol">representReal</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a real node as a floating point scalar.</p>
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representSysTime"></a><span class="ddoc_psymbol">representSysTime</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a SysTime node as a timestamp.</p>
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representNodes"></a><span class="ddoc_psymbol">representNodes</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a sequence node as sequence/set.</p>
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
<dt class="d_decl">Node <a name="representPairs"></a><span class="ddoc_psymbol">representPairs</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
|
|
|
</dt>
|
|
|
|
|
<dd><p>Represent a mapping node as map/ordered map/pairs.</p>
|
|
|
|
|
|
|
|
|
|
</dd>
|
|
|
|
|
</dl>
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
<div id="copyright">
|
|
|
|
|
Copyright © Ferdinand Majerech 2011. Based on <a href="http://www.pyyaml.org">PyYAML</a> by Kirill Simonov. |
|
|
|
|
|
Page generated by Autodoc and <a href="http://www.digitalmars.com/d/2.0/ddoc.html">Ddoc</a>.
|
|
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|
</div>
|
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</body>
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</html>
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