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.
24 lines
716 B
Plaintext
24 lines
716 B
Plaintext
#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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View :: protocol {
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// Measure: given a size proposal, return desired size
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size_that_fits :: (self: *Self, proposal: ProposedSize) -> Size;
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// Place: position children within the given bounds
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layout :: (self: *Self, bounds: Frame);
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// Render: emit render nodes
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render :: (self: *Self, ctx: *RenderContext, frame: Frame);
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// Event handling: return true if the event was consumed
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handle_event :: (self: *Self, event: *Event, frame: Frame) -> bool;
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}
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// A child view with its computed frame (set during layout)
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ViewChild :: struct {
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view: View;
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computed_frame: Frame = .zero();
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}
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