989e18b760
Replace the bare-paren tuple grammar with explicit, position-unambiguous
forms, mirroring how structs work:
type `(A, B)` -> `Tuple(A, B)` (named keeps `:`)
value `(a, b)` -> `.(a, b)` (named uses `=`)
typed (new) -> `Tuple(A, B).(a, b)` (like `Point.{...}`)
failable `-> (T, !)` -> `-> T !`
`-> (T1, T2, !)`-> `-> Tuple(T1, T2) !` (channel outside Tuple)
Bare `(...)` is now grouping only, everywhere; a comma in bare parens is a
hard error with a migration hint. Grouping, function types `(A, B) -> R`,
param lists, lambdas, and match bindings are unaffected.
`Tuple(...)` is strictly a TYPE in every position (including `size_of` /
`type_info` args); a tuple VALUE comes only from `.(...)` (anonymous) or
`Tuple(...).(...)` (explicitly typed). A bare `Tuple(1, 2)` is a tuple
type with non-type elements -> rejected.
The ~110 tuple-bearing corpus files were migrated with a one-shot
AST-aware migrator (the `sx migrate` tool from the prior commit, removed
here). New examples: 0130 (new syntax), 0131 (typed construction), 1060
(named-tuple failable return). 1116 golden updated for the new hint text.
39 lines
897 B
Plaintext
39 lines
897 B
Plaintext
#import "modules/std.sx";
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#import "modules/ui/types.sx";
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#import "modules/ui/render.sx";
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#import "modules/ui/events.sx";
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#import "modules/ui/view.sx";
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#import "modules/ui/font.sx";
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Label :: struct {
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text: string;
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font_size: f32;
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color: Color;
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make :: (text: string) -> Label {
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Label.{
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text = text,
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font_size = 14.0,
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color = COLOR_WHITE
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}
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}
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}
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impl View for Label {
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size_that_fits :: (self: *Label, proposal: ProposedSize) -> Size {
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measure_text(self.text, self.font_size)
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}
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layout :: (self: *Label, bounds: Frame) {
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// Leaf view — nothing to place
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}
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render :: (self: *Label, ctx: *RenderContext, frame: Frame) {
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ctx.add_text(frame, self.text, self.font_size, self.color);
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}
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handle_event :: (self: *Label, event: *Event, frame: Frame) -> bool {
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false
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}
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}
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