dyaml/examples/resolver/main.d
Ferdinand Majerech 548480b06b Changed the Constructor API (for loading of custom types) to
make it easier to load custom classes/structs. Updated API docs,
tutorials and examples accordingly.
2011-10-17 12:53:38 +02:00

110 lines
2.6 KiB
D

import std.ascii;
import std.stdio;
import std.string;
import yaml;
struct Color
{
ubyte red;
ubyte green;
ubyte blue;
}
Color constructColorScalar(Mark start, Mark end, ref Node node)
{
string value = node.get!string;
if(value.length != 6)
{
throw new ConstructorException("Invalid color: " ~ value, start, end);
}
//We don't need to check for uppercase chars this way.
value = value.toLower();
//Get value of a hex digit.
uint hex(char c)
{
if(!std.ascii.isHexDigit(c))
{
throw new ConstructorException("Invalid color: " ~ value, start, end);
}
if(std.ascii.isDigit(c))
{
return c - '0';
}
return c - 'a' + 10;
}
Color result;
result.red = cast(ubyte)(16 * hex(value[0]) + hex(value[1]));
result.green = cast(ubyte)(16 * hex(value[2]) + hex(value[3]));
result.blue = cast(ubyte)(16 * hex(value[4]) + hex(value[5]));
return result;
}
Color constructColorMapping(Mark start, Mark end, ref Node node)
{
int r,g,b;
bool error = false;
//Might throw if a value is missing or is not an integer.
try
{
r = node["r"].get!int;
g = node["g"].get!int;
b = node["b"].get!int;
}
catch(NodeException e)
{
error = true;
}
if(error || r < 0 || r > 255 || g < 0 || g > 255 || b < 0 || b > 255)
{
throw new ConstructorException("Invalid color", start, end);
}
return Color(cast(ubyte)r, cast(ubyte)g, cast(ubyte)b);
}
void main()
{
auto red = Color(255, 0, 0);
auto orange = Color(255, 255, 0);
try
{
auto constructor = new Constructor;
//both functions handle the same tag, but one handles scalar, one mapping.
constructor.addConstructorScalar("!color", &constructColorScalar);
constructor.addConstructorMapping("!color-mapping", &constructColorMapping);
auto resolver = new Resolver;
resolver.addImplicitResolver("!color", std.regex.regex("[0-9a-fA-F]{6}"),
"0123456789abcdefABCDEF");
auto loader = Loader("input.yaml");
loader.constructor = constructor;
loader.resolver = resolver;
auto root = loader.load();
if(root["scalar-red"].get!Color == red &&
root["mapping-red"].get!Color == red &&
root["scalar-orange"].get!Color == orange &&
root["mapping-orange"].get!Color == orange)
{
writeln("SUCCESS");
return;
}
}
catch(YAMLException e)
{
writeln(e.msg);
}
writeln("FAILURE");
}