public void CanParse()
{
Assert.Equal(Top | Left, CropAnchorHelper.Parse("tl"));
Assert.Equal(Top | Right, CropAnchorHelper.Parse("tr"));
Assert.Equal(Top, CropAnchorHelper.Parse("t"));
Assert.Equal(Left, CropAnchorHelper.Parse("l"));
Assert.Equal(Bottom, CropAnchorHelper.Parse("b"));
Assert.Equal(Right, CropAnchorHelper.Parse("r"));
Assert.Equal(Center, CropAnchorHelper.Parse("c"));
// Full words
Assert.Equal(Top, CropAnchorHelper.Parse("top"));
Assert.Equal(Right, CropAnchorHelper.Parse("right"));
Assert.Equal(Bottom, CropAnchorHelper.Parse("bottom"));
Assert.Equal(Left, CropAnchorHelper.Parse("left"));
}
// 100×100
// 100x100
// 100x100,contain
// 100x100-c
// resize(100,100,contain)
public static ResizeTransform Parse(string segment)
{
int argStart = segment.IndexOf('(') + 1;
if (argStart > 0)
{
segment = segment.Substring(argStart, segment.Length - argStart - 1);
}
int dashIndex = segment.IndexOf('-');
// {width}x{height}-{anchor}
// e.g. 100x100-c
if (dashIndex > -1)
{
return(new ResizeTransform(
size: SizeHelper.Parse(segment.Substring(0, dashIndex)),
anchor: CropAnchorHelper.Parse(segment.Substring(dashIndex + 1))
));
}
else if (segment.IndexOf(',') > -1)
{
var args = ArgumentList.Parse(segment);
Unit width = default;
Unit height = default;
ResizeFlags flags = default;
CropAnchor? anchor = null;
for (int i = 0; i < args.Length; i++)
{
ref Argument arg = ref args[i];
int xIndex = arg.Value.ToString().IndexOf('x');
if (i == 0 && xIndex > -1)
{
width = Unit.Parse(arg.Value.ToString().Substring(0, xIndex));
height = Unit.Parse(arg.Value.ToString().Substring(xIndex + 1));
continue;
}
if (i == 0 && width == default)
{
width = Unit.Parse(arg.Value.ToString());
}
else if (i == 1 && height == default)
{
height = Unit.Parse(arg.Value.ToString());
}
else
{
switch (arg.Name)
{
case "anchor": anchor = CropAnchorHelper.Parse(arg.Value.ToString()); break;
case null: flags = ResizeFlagsHelper.Parse(arg.Value.ToString()); break;
default: throw new Exception("Invalid resize argument:" + arg.Name);
}
}
}
return(new ResizeTransform(width, height, anchor, flags));
}
