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https://github.com/carbon-language/carbon-lang.git
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Dana Jansens
085e45093e
If the `match_first` is not followed by `{` avoid consuming whatever
comes after it. Recover by leaving whatever comes next alone. It could
even be the `FileEnd` token, and then we would crash when we read off
the end of the token stream looking for `FileEnd`.
38 lines
1.2 KiB
C++
38 lines
1.2 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/lex/token_kind.h"
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#include "toolchain/parse/context.h"
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#include "toolchain/parse/handle.h"
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namespace Carbon::Parse {
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auto HandleMatchFirst(Context& context) -> void {
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auto state = context.PopState();
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// MatchFirstIntroducer node is automatically added for the MatchFirst state.
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if (auto open_curly = context.ConsumeAndAddOpenCurlyBrace(
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state.token, NodeKind::MatchFirstDefinitionStart)) {
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state.token = *open_curly;
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} else {
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state.has_error = true;
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}
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context.PushState(state, StateKind::MatchFirstFinish);
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if (!state.has_error) {
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context.PushState(StateKind::DeclScopeLoopAsRegular);
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}
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}
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auto HandleMatchFirstFinish(Context& context) -> void {
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auto state = context.PopState();
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if (auto closing_token = context.ConsumeIf(Lex::TokenKind::CloseCurlyBrace)) {
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context.AddNode(NodeKind::MatchFirst, *closing_token, state.has_error);
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} else {
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// Recover from error by just moving on.
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context.AddNode(NodeKind::MatchFirst, state.token, state.has_error);
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}
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}
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} // namespace Carbon::Parse
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