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< h1 > dyaml.constructor< / h1 >
<!-- Generated by Ddoc from dyaml/constructor.d -->
< p > Implements a class that processes YAML mappings, sequences and scalars into
nodes. This can be used to implement custom data types. A tutorial can be
found < a href = "../tutorials/custom_types.html" > here< / a > .< / p >
< dl > < dt class = "d_decl" > class < a name = "ConstructorException" > < / a > < span class = "ddoc_psymbol" > ConstructorException< / span > : dyaml.exception.YAMLException;
< / dt >
< dd > < p > Exception thrown at constructor errors.
< / p >
< p > Can be thrown by custom constructor functions.< / p >
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< dl > < dt class = "d_decl" > this(string < b > msg< / b > , Mark < b > start< / b > , Mark < b > end< / b > , string < b > file< / b > = __FILE__, int < b > line< / b > = __LINE__);
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< / dt >
< dd > < p > Construct a ConstructorException.
< / p >
< b > Parameters:< / b > < div class = "pbr" > < table class = parms > < tr > < td valign = top > string < b > msg< / b > < / td >
< td valign = top > Error message.< / td > < / tr >
< tr > < td valign = top > Mark < b > start< / b > < / td >
< td valign = top > Start position of the error context.< / td > < / tr >
< tr > < td valign = top > Mark < b > end< / b > < / td >
< td valign = top > End position of the error context.< / td > < / tr >
< / table > < / div >
< / dd >
< / dl >
< / dd >
< dt class = "d_decl" > class < a name = "Constructor" > < / a > < span class = "ddoc_psymbol" > Constructor< / span > ;
< / dt >
< dd > < p > Constructs YAML values.
< / p >
< p > Each YAML scalar, sequence or mapping has a tag specifying its data type.
< a name = "Constructor" > < / a > < span class = "ddoc_psymbol" > Constructor< / span > uses user-specifyable functions to create a node of desired
data type from a scalar, sequence or mapping.
< br >
Each of these functions is associated with a tag, and can process either
a scalar, a sequence, or a mapping. The constructor passes each value to
the function with corresponding tag, which then returns the resulting value
that can be stored in a node.
< br >
If a tag is detected with no known constructor function, it is considered an error.< / p >
< dl > < dt class = "d_decl" > this(in bool < b > defaultConstructors< / b > = true);
< / dt >
< dd > < p > Construct a Constructor.
< / p >
< p > If you don't want to support default YAML tags/data types, you can use
< b > defaultConstructors< / b > to disable constructor functions for these.
< / p >
< b > Parameters:< / b > < div class = "pbr" > < table class = parms > < tr > < td valign = top > bool < b > defaultConstructors< / b > < / td >
< td valign = top > Use constructors for default YAML tags?< / td > < / tr >
< / table > < / div >
< / dd >
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< dt class = "d_decl" > void < a name = "addConstructorScalar" > < / a > < span class = "ddoc_psymbol" > addConstructorScalar< / span > (T)(in string < b > tag< / b > , T function(Mark, Mark, ref Node) < b > ctor< / b > );
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< / dt >
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< dd > < p > Add a constructor function from scalar.
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< / p >
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< p > The function must take two Marks (start and end positions of
the node in file) and a reference to Node to construct from.
The node contains a string for scalars, Node[] for sequences and
Node.Pair[] for mappings.
The value returned by this function will be stored in the resulting node.
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< br >
Only one constructor function can be set for one tag.
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< / p >
< b > Parameters:< / b > < div class = "pbr" > < table class = parms > < tr > < td valign = top > tag< / td >
< td valign = top > Tag for the function to handle.< / td > < / tr >
< tr > < td valign = top > ctor< / td >
< td valign = top > Constructor function.< / td > < / tr >
< / table > < / div >
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< p > < b > Example:< / b > < br >
< pre class = "d_code" > < span class = "d_keyword" > import< / span > std.string;
< span class = "d_keyword" > import< / span > yaml;
< span class = "d_keyword" > struct< / span > MyStruct
{
< span class = "d_keyword" > int< / span > x, y, z;
}
MyStruct constructMyStructScalar(Mark start, Mark end, < span class = "d_keyword" > ref< / span > Node node)
{
< span class = "d_comment" > //Guaranteed to be string as we construct from scalar.
< / span > < span class = "d_comment" > //!mystruct x:y:z
< / span > < span class = "d_keyword" > auto< / span > parts = node.get!string().split(< span class = "d_string" > ":"< / span > );
< span class = "d_keyword" > try< / span >
{
< span class = "d_keyword" > return< / span > MyStruct(to!< span class = "d_keyword" > int< / span > (parts[0]), to!< span class = "d_keyword" > int< / span > (parts[1]), to!< span class = "d_keyword" > int< / span > (parts[2]));
}
< span class = "d_keyword" > catch< / span > (Exception e)
{
< span class = "d_keyword" > throw< / span > < span class = "d_keyword" > new< / span > ConstructorException(< span class = "d_string" > "Could not construct MyStruct: "< / span > ~ e.msg,
start, end);
}
}
< span class = "d_keyword" > void< / span > main()
{
< span class = "d_keyword" > auto< / span > loader = Loader(< span class = "d_string" > "file.yaml"< / span > );
< span class = "d_keyword" > auto< / span > constructor = < span class = "d_keyword" > new< / span > Constructor;
constructor.< span class = "d_psymbol" > addConstructorScalar< / span > (< span class = "d_string" > "!mystruct"< / span > , & constructMyStructScalar);
loader.constructor = constructor;
Node node = loader.load();
}
< / pre >
< / p >
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< / dd >
< dt class = "d_decl" > void < a name = "addConstructorSequence" > < / a > < span class = "ddoc_psymbol" > addConstructorSequence< / span > (T)(in string < b > tag< / b > , T function(Mark, Mark, ref Node) < b > ctor< / b > );
< / dt >
< dd > < p > Add a constructor function from sequence.
< / p >
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< b > See Also:< / b > < div class = "pbr" > addConstructorScalar
< / div >
< p > < b > Example:< / b > < br >
< pre class = "d_code" > < span class = "d_keyword" > import< / span > std.string;
< span class = "d_keyword" > import< / span > yaml;
< span class = "d_keyword" > struct< / span > MyStruct
{
< span class = "d_keyword" > int< / span > x, y, z;
}
MyStruct constructMyStructSequence(Mark start, Mark end, < span class = "d_keyword" > ref< / span > Node node)
{
< span class = "d_comment" > //node is guaranteed to be sequence.
< / span > < span class = "d_comment" > //!mystruct [x, y, z]
< / span > < span class = "d_keyword" > try< / span >
{
< span class = "d_keyword" > return< / span > MyStruct(node[0].get!< span class = "d_keyword" > int< / span > , node[1].get!< span class = "d_keyword" > int< / span > , node[2].get!< span class = "d_keyword" > int< / span > );
}
< span class = "d_keyword" > catch< / span > (NodeException e)
{
< span class = "d_keyword" > throw< / span > < span class = "d_keyword" > new< / span > ConstructorException(< span class = "d_string" > "Could not construct MyStruct: "< / span > ~ e.msg,
start, end);
}
}
< span class = "d_keyword" > void< / span > main()
{
< span class = "d_keyword" > auto< / span > loader = Loader(< span class = "d_string" > "file.yaml"< / span > );
< span class = "d_keyword" > auto< / span > constructor = < span class = "d_keyword" > new< / span > Constructor;
constructor.< span class = "d_psymbol" > addConstructorSequence< / span > (< span class = "d_string" > "!mystruct"< / span > , & constructMyStructSequence);
loader.constructor = constructor;
Node node = loader.load();
}
< / pre >
< / p >
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< / dd >
< dt class = "d_decl" > void < a name = "addConstructorMapping" > < / a > < span class = "ddoc_psymbol" > addConstructorMapping< / span > (T)(in string < b > tag< / b > , T function(Mark, Mark, ref Node) < b > ctor< / b > );
< / dt >
< dd > < p > Add a constructor function from a mapping.
< / p >
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< b > See Also:< / b > < div class = "pbr" > addConstructorScalar
< / div >
< p > < b > Example:< / b > < br >
< pre class = "d_code" > < span class = "d_keyword" > import< / span > std.string;
< span class = "d_keyword" > import< / span > yaml;
< span class = "d_keyword" > struct< / span > MyStruct
{
< span class = "d_keyword" > int< / span > x, y, z;
}
MyStruct constructMyStructMapping(Mark start, Mark end, < span class = "d_keyword" > ref< / span > Node node)
{
< span class = "d_comment" > //node is guaranteed to be mapping.
< / span > < span class = "d_comment" > //!mystruct {"x": x, "y": y, "z": z}
< / span > < span class = "d_keyword" > try< / span >
{
< span class = "d_keyword" > return< / span > MyStruct(node[< span class = "d_string" > "x"< / span > ].get!< span class = "d_keyword" > int< / span > , node[< span class = "d_string" > "y"< / span > ].get!< span class = "d_keyword" > int< / span > , node[< span class = "d_string" > "z"< / span > ].get!< span class = "d_keyword" > int< / span > );
}
< span class = "d_keyword" > catch< / span > (NodeException e)
{
< span class = "d_keyword" > throw< / span > < span class = "d_keyword" > new< / span > ConstructorException(< span class = "d_string" > "Could not construct MyStruct: "< / span > ~ e.msg,
start, end);
}
}
< span class = "d_keyword" > void< / span > main()
{
< span class = "d_keyword" > auto< / span > loader = Loader(< span class = "d_string" > "file.yaml"< / span > );
< span class = "d_keyword" > auto< / span > constructor = < span class = "d_keyword" > new< / span > Constructor;
constructor.< span class = "d_psymbol" > addConstructorMapping< / span > (< span class = "d_string" > "!mystruct"< / span > , & constructMyStructMapping);
loader.constructor = constructor;
Node node = loader.load();
}
< / pre >
< / p >
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< / dd >
< / dl >
< / dd >
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< dt class = "d_decl" > YAMLNull < a name = "constructNull" > < / a > < span class = "ddoc_psymbol" > constructNull< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a < b > null< / b > < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > YAMLMerge < a name = "constructMerge" > < / a > < span class = "ddoc_psymbol" > constructMerge< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a merge < b > node< / b > - a < b > node< / b > that merges another < b > node< / b > into a mapping.< / p >
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< / dd >
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< dt class = "d_decl" > bool < a name = "constructBool" > < / a > < span class = "ddoc_psymbol" > constructBool< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a boolean < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > long < a name = "constructLong" > < / a > < span class = "ddoc_psymbol" > constructLong< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct an integer (long) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > real < a name = "constructReal" > < / a > < span class = "ddoc_psymbol" > constructReal< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a floating point (real) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > ubyte[] < a name = "constructBinary" > < / a > < span class = "ddoc_psymbol" > constructBinary< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a binary (base64) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > SysTime < a name = "constructTimestamp" > < / a > < span class = "ddoc_psymbol" > constructTimestamp< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a timestamp (SysTime) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > string < a name = "constructString" > < / a > < span class = "ddoc_psymbol" > constructString< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a string < b > node< / b > .< / p >
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< / dd >
< dt class = "d_decl" > Pair[] < a name = "getPairs" > < / a > < span class = "ddoc_psymbol" > getPairs< / span > (string < b > type< / b > , Mark < b > start< / b > , Mark < b > end< / b > , Node[] < b > nodes< / b > );
< / dt >
< dd > < p > Convert a sequence of single-element mappings into a sequence of pairs.< / p >
< / dd >
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< dt class = "d_decl" > Pair[] < a name = "constructOrderedMap" > < / a > < span class = "ddoc_psymbol" > constructOrderedMap< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct an ordered map (ordered sequence of key:value pairs without duplicates) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > Pair[] < a name = "constructPairs" > < / a > < span class = "ddoc_psymbol" > constructPairs< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a pairs (ordered sequence of key: value pairs allowing duplicates) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > Node[] < a name = "constructSet" > < / a > < span class = "ddoc_psymbol" > constructSet< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a set < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > Node[] < a name = "constructSequence" > < / a > < span class = "ddoc_psymbol" > constructSequence< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct a sequence (array) < b > node< / b > .< / p >
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< / dd >
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< dt class = "d_decl" > Pair[] < a name = "constructMap" > < / a > < span class = "ddoc_psymbol" > constructMap< / span > (Mark < b > start< / b > , Mark < b > end< / b > , ref Node < b > node< / b > );
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< / dt >
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< dd > < p > Construct an unordered map (unordered set of key: value pairs without duplicates) < b > node< / b > .< / p >
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< / 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 > .
< / div >
< / body >
< / html >
