412 lines
20 KiB
HTML
412 lines
20 KiB
HTML
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<h1>dyaml.representer</h1>
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<!-- Generated by Ddoc from dyaml/representer.d -->
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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"><a name="RepresenterException"></a>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"><a name="Representer"></a>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 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"><a name="Representer.this"></a>pure @safe this(const Flag!"<b>useDefaultRepresenters</b>" <b>useDefaultRepresenters</b> = Yes.<b>useDefaultRepresenters</b>);
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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>Flag!"<b>useDefaultRepresenters</b>" <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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</dd>
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<dt class="d_decl"><a name="Representer.defaultScalarStyle"></a>pure nothrow @property @safe 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. If <b>style</b> is <span class="d_inlinecode">ScalarStyle.Invalid</span>, the style is chosen automatically.</p>
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</dd>
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<dt class="d_decl"><a name="Representer.defaultCollectionStyle"></a>pure nothrow @property @safe 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. If <b>style</b> is <span class="d_inlinecode">CollectionStyle.Invalid</span>, the style is chosen automatically. </p>
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</dd>
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<dt class="d_decl"><a name="Representer.addRepresenter"></a>pure @trusted 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 <span class="d_inlinecode">Node</span> storing the data
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type and to the <span class="d_inlinecode">Representer</span>. It returns the represented node and may
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throw a <span class="d_inlinecode">RepresenterException</span>. See the example for more information.
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<br>
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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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<span class="d_inlinecode">Representer</span> constructor.
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<br>
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<br>
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Structs and classes must implement the <span class="d_inlinecode">opCmp()</span> operator for D:YAML
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support. The signature of the operator that must be implemented
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is <span class="d_inlinecode">const int opCmp(ref const MyStruct s)</span> for structs where
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<i>MyStruct</i> is the struct type, and <span class="d_inlinecode">int opCmp(Object o)</span> for
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classes. Note that the class <span class="d_inlinecode">opCmp()</span> should not alter the compared
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values - it is not const for compatibility reasons.
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</p>
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<b>Parameters:</b><div class="pbr"><table class=parms><tr><td valign=top>Node function(ref Node, Representer) 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> dyaml.all;
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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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<span class="d_comment">//Any D:YAML type must have a custom opCmp operator.
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</span> <span class="d_comment">//This is used for ordering in mappings.
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</span> <span class="d_keyword">const</span> <span class="d_keyword">int</span> opCmp(<span class="d_keyword">ref</span> <span class="d_keyword">const</span> MyStruct s)
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{
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<span class="d_keyword">if</span>(x != s.x){<span class="d_keyword">return</span> x - s.x;}
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<span class="d_keyword">if</span>(y != s.y){<span class="d_keyword">return</span> y - s.y;}
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<span class="d_keyword">if</span>(z != s.z){<span class="d_keyword">return</span> z - s.z;}
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<span class="d_keyword">return</span> 0;
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}
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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(<span class="d_string">"%s:%s:%s"</span>, value.x, value.y, 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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<br>
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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> dyaml.all;
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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">//Any D:YAML type must have a custom opCmp operator.
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</span> <span class="d_comment">//This is used for ordering in mappings.
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</span> <span class="d_keyword">override</span> <span class="d_keyword">int</span> opCmp(Object o)
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{
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MyClass s = <span class="d_keyword">cast</span>(MyClass)o;
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<span class="d_keyword">if</span>(s <span class="d_keyword">is</span> <span class="d_keyword">null</span>){<span class="d_keyword">return</span> -1;}
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<span class="d_keyword">if</span>(x != s.x){<span class="d_keyword">return</span> x - s.x;}
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<span class="d_keyword">if</span>(y != s.y){<span class="d_keyword">return</span> y - s.y;}
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<span class="d_keyword">if</span>(z != s.z){<span class="d_keyword">return</span> z - s.z;}
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<span class="d_keyword">return</span> 0;
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}
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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(%s, %s, %s)"</span>, x, y, z);
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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(<span class="d_string">"%s:%s:%s"</span>, value.x, value.y, 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"><a name="Representer.representScalar"></a>@safe 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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<span class="d_comment">//Any D:YAML type must have a custom opCmp operator.
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</span> <span class="d_comment">//This is used for ordering in mappings.
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</span> <span class="d_keyword">const</span> <span class="d_keyword">int</span> opCmp(<span class="d_keyword">ref</span> <span class="d_keyword">const</span> MyStruct s)
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{
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<span class="d_keyword">if</span>(x != s.x){<span class="d_keyword">return</span> x - s.x;}
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<span class="d_keyword">if</span>(y != s.y){<span class="d_keyword">return</span> y - s.y;}
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<span class="d_keyword">if</span>(z != s.z){<span class="d_keyword">return</span> z - s.z;}
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<span class="d_keyword">return</span> 0;
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}
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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(<span class="d_string">"%s:%s:%s"</span>, value.x, value.y, 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"><a name="Representer.representSequence"></a>@trusted 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 sequence.</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"><span class="d_inlinecode">RepresenterException</span> 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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<span class="d_comment">//Any D:YAML type must have a custom opCmp operator.
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</span> <span class="d_comment">//This is used for ordering in mappings.
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</span> <span class="d_keyword">const</span> <span class="d_keyword">int</span> opCmp(<span class="d_keyword">ref</span> <span class="d_keyword">const</span> MyStruct s)
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{
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<span class="d_keyword">if</span>(x != s.x){<span class="d_keyword">return</span> x - s.x;}
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<span class="d_keyword">if</span>(y != s.y){<span class="d_keyword">return</span> y - s.y;}
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<span class="d_keyword">if</span>(z != s.z){<span class="d_keyword">return</span> z - s.z;}
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<span class="d_keyword">return</span> 0;
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}
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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> nodes = [Node(value.x), Node(value.y), Node(value.z)];
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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);
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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"><a name="Representer.representMapping"></a>@trusted Node <a name="representMapping"></a><span class="ddoc_psymbol">representMapping</span>(string <b>tag</b>, Node.Pair[] <b>pairs</b>, CollectionStyle <b>style</b> = CollectionStyle.Invalid);
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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>Node.Pair[] <b>pairs</b></td>
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<td valign=top>Key-value pairs of the mapping.</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 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>
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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"><span class="d_inlinecode">RepresenterException</span> 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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<span class="d_comment">//Any D:YAML type must have a custom opCmp operator.
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</span> <span class="d_comment">//This is used for ordering in mappings.
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</span> <span class="d_keyword">const</span> <span class="d_keyword">int</span> opCmp(<span class="d_keyword">ref</span> <span class="d_keyword">const</span> MyStruct s)
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{
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<span class="d_keyword">if</span>(x != s.x){<span class="d_keyword">return</span> x - s.x;}
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<span class="d_keyword">if</span>(y != s.y){<span class="d_keyword">return</span> y - s.y;}
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<span class="d_keyword">if</span>(z != s.z){<span class="d_keyword">return</span> z - s.z;}
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<span class="d_keyword">return</span> 0;
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}
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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">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)];
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<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"><a name="representNull"></a>@safe 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"><a name="representString"></a>@safe 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"><a name="representBytes"></a>@system Node <a name="representBytes"></a><span class="ddoc_psymbol">representBytes</span>(ref Node <b>node</b>, Representer <b>representer</b>);
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</dt>
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<dd><p>Represent a bytes node as a binary scalar.</p>
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</dd>
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<dt class="d_decl"><a name="representBool"></a>@safe Node <a name="representBool"></a><span class="ddoc_psymbol">representBool</span>(ref Node <b>node</b>, Representer <b>representer</b>);
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|
</dt>
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|
<dd><p>Represent a bool node as a bool scalar.</p>
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|
|
|
</dd>
|
|
<dt class="d_decl"><a name="representLong"></a>@system 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>
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|
|
|
</dd>
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|
<dt class="d_decl"><a name="representReal"></a>@system Node <a name="representReal"></a><span class="ddoc_psymbol">representReal</span>(ref Node <b>node</b>, Representer <b>representer</b>);
|
|
</dt>
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|
<dd><p>Represent a real node as a floating point scalar.</p>
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|
|
|
</dd>
|
|
<dt class="d_decl"><a name="representSysTime"></a>@system 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>
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|
</dd>
|
|
<dt class="d_decl"><a name="representNodes"></a>@safe Node <a name="representNodes"></a><span class="ddoc_psymbol">representNodes</span>(ref Node <b>node</b>, Representer <b>representer</b>);
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|
</dt>
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|
<dd><p>Represent a sequence node as sequence/set.</p>
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|
</dd>
|
|
<dt class="d_decl"><a name="representPairs"></a>@system 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>
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|
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|
</div>
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<div id="copyright">
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Copyright © Ferdinand Majerech 2011. Based on <a href="http://www.pyyaml.org">PyYAML</a> by Kirill Simonov. |
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Page generated by AutoDDoc 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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