548480b06b
make it easier to load custom classes/structs. Updated API docs, tutorials and examples accordingly.
105 lines
2.4 KiB
D
105 lines
2.4 KiB
D
import std.ascii;
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import std.stdio;
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import std.string;
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import yaml;
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struct Color
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{
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ubyte red;
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ubyte green;
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ubyte blue;
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}
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Color constructColorScalar(Mark start, Mark end, ref Node node)
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{
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string value = node.get!string;
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if(value.length != 6)
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{
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throw new ConstructorException("Invalid color: " ~ value, start, end);
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}
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//We don't need to check for uppercase chars this way.
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value = value.toLower();
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//Get value of a hex digit.
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uint hex(char c)
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{
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if(!std.ascii.isHexDigit(c))
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{
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throw new ConstructorException("Invalid color: " ~ value, start, end);
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}
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if(std.ascii.isDigit(c))
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{
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return c - '0';
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}
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return c - 'a' + 10;
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}
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Color result;
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result.red = cast(ubyte)(16 * hex(value[0]) + hex(value[1]));
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result.green = cast(ubyte)(16 * hex(value[2]) + hex(value[3]));
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result.blue = cast(ubyte)(16 * hex(value[4]) + hex(value[5]));
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return result;
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}
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Color constructColorMapping(Mark start, Mark end, ref Node node)
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{
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int r,g,b;
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bool error = false;
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//Might throw if a value is missing or is not an integer.
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try
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{
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r = node["r"].get!int;
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g = node["g"].get!int;
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b = node["b"].get!int;
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}
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catch(NodeException e)
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{
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error = true;
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}
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if(error || r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255)
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{
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throw new ConstructorException("Invalid color", start, end);
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}
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return Color(cast(ubyte)r, cast(ubyte)g, cast(ubyte)b);
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}
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void main()
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{
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auto red = Color(255, 0, 0);
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auto orange = Color(255, 255, 0);
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try
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{
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auto constructor = new Constructor;
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//both functions handle the same tag, but one handles scalar, one mapping.
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constructor.addConstructorScalar("!color", &constructColorScalar);
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constructor.addConstructorMapping("!color-mapping", &constructColorMapping);
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auto loader = Loader("input.yaml");
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loader.constructor = constructor;
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auto root = loader.load();
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if(root["scalar-red"].get!Color == red &&
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root["mapping-red"].get!Color == red &&
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root["scalar-orange"].get!Color == orange &&
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root["mapping-orange"].get!Color == orange)
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{
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writeln("SUCCESS");
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return;
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}
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}
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catch(YAMLException e)
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{
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writeln(e.msg);
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}
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writeln("FAILURE");
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}
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