This adds horizontal_alignment/vertical_alignment properties, along with
width/height to Text.
This still uses a hard-coded enumeration in the compiler, which is meant
to go away in favor of general enum support.
The Rectangle element has properties for a border outline. If those are
used, then the generated code should use BorderRectangle. But if they are
not used, then we can fall back to just generating a Rectangle.
When going from the plain rowan::SyntaxNode tree to the syntax_nodes::*
elements, attach the source file and keep track of it from that point
on. That'll pave the way for proper multi-file diagnostics generated
later on from the passes, where we store syntax_nodes::* types.
Let the bulk of the push_error() calls take a Spanned trait impl, so
that we can pass node on the call sites. Then when later change the
underyling trait to pass something that can also provide the source file
and we don't have to change all call sites again.
Using the commands property we can just paste SVG paths. This makes it
much easier to write examples/demos. A good online path designer is
for example https://codepen.io/anthonydugois/pen/mewdyZ
Require that the values to the path element properties are numerical literals.
The conversion happens in the path "compilation" pass, where we can do more
pre-calcuation in the future.
The following scenario would fail compiling to C++ because we failed to
determine the return type of the conditional expression:
Test := Rectangle {
property<bool> condition;
property<color> extra_color;
color: condition ? root.extra_color : 4289374890;
}
The type of the true branch would be color and the false branch would be
a float. Since they "disagree", ty() on the expression would return
Type::Invalid. This was temporarily worked around in the C++ generator
by always returning the type of the true branch, but that's wrong.
Instead this patch changes maybe_convert_to to apply the Cast expression
to the individual branches, placing the cast only to the numberic
literal and correcting the return value of ty() on the conditional
expression.
