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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
b8d4e2f41b
- Rename `PatternBinding` to `BindingPattern`. - Use `BindingPattern` rather than `Pattern` in the names of binding-pattern-specific parse states.
62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "toolchain/parse/context.h"
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namespace Carbon::Parse {
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auto HandleLet(Context& context) -> void {
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context.PopAndDiscardState();
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// These will start at the `let`.
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context.PushState(State::LetFinish);
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context.PushState(State::LetAfterPattern);
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context.AddLeafNode(NodeKind::LetIntroducer, context.Consume());
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// This will start at the pattern.
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context.PushState(State::BindingPatternAsLet);
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}
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auto HandleLetAfterPattern(Context& context) -> void {
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auto state = context.PopState();
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if (state.has_error) {
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if (auto after_pattern =
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context.FindNextOf({Lex::TokenKind::Equal, Lex::TokenKind::Semi})) {
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context.SkipTo(*after_pattern);
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}
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}
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if (auto equals = context.ConsumeIf(Lex::TokenKind::Equal)) {
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context.AddLeafNode(NodeKind::LetInitializer, *equals);
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context.PushState(State::Expr);
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} else if (!state.has_error) {
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CARBON_DIAGNOSTIC(
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ExpectedInitializerAfterLet, Error,
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"Expected `=`; `let` declaration must have an initializer.");
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context.emitter().Emit(*context.position(), ExpectedInitializerAfterLet);
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context.ReturnErrorOnState();
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}
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}
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auto HandleLetFinish(Context& context) -> void {
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auto state = context.PopState();
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auto end_token = state.token;
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if (context.PositionIs(Lex::TokenKind::Semi)) {
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end_token = context.Consume();
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} else {
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context.EmitExpectedDeclSemi(Lex::TokenKind::Let);
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state.has_error = true;
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if (auto semi_token = context.SkipPastLikelyEnd(state.token)) {
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end_token = *semi_token;
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}
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}
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context.AddNode(NodeKind::LetDecl, end_token, state.subtree_start,
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state.has_error);
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}
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} // namespace Carbon::Parse
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