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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Ross-Perkins
74e1a9949f
Parameter lists need substantially different treatment than tuple patterns in other contexts, so this change splits them into separate parse node kinds. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
103 lines
3.1 KiB
C++
103 lines
3.1 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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#include "toolchain/parse/handle.h"
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namespace Carbon::Parse {
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auto HandleChoiceIntroducer(Context& context) -> void {
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auto state = context.PopState();
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context.PushState(state, State::ChoiceDefinitionStart);
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context.PushState(State::DeclNameAndParams, state.token);
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}
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auto HandleChoiceDefinitionStart(Context& context) -> void {
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auto state = context.PopState();
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if (!context.PositionIs(Lex::TokenKind::OpenCurlyBrace)) {
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if (!state.has_error) {
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CARBON_DIAGNOSTIC(ExpectedChoiceDefinition, Error,
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"choice definition expected");
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context.emitter().Emit(*context.position(), ExpectedChoiceDefinition);
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}
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context.AddNode(NodeKind::ChoiceDefinitionStart, *context.position(),
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/*has_error=*/true);
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context.AddNode(NodeKind::ChoiceDefinition, *context.position(),
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/*has_error=*/true);
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context.SkipPastLikelyEnd(*context.position());
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return;
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}
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context.AddNode(NodeKind::ChoiceDefinitionStart, context.Consume(),
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state.has_error);
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state.has_error = false;
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state.state = State::ChoiceDefinitionFinish;
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context.PushState(state);
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if (!context.PositionIs(Lex::TokenKind::CloseCurlyBrace)) {
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context.PushState(State::ChoiceAlternative);
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}
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}
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auto HandleChoiceAlternative(Context& context) -> void {
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auto state = context.PopState();
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context.PushState(State::ChoiceAlternativeFinish);
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auto token = context.ConsumeIf(Lex::TokenKind::Identifier);
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if (!token) {
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if (!state.has_error) {
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CARBON_DIAGNOSTIC(ExpectedChoiceAlternativeName, Error,
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"expected choice alternative name");
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context.emitter().Emit(*context.position(),
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ExpectedChoiceAlternativeName);
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}
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context.SkipPastLikelyEnd(*context.position());
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context.ReturnErrorOnState();
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return;
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}
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if (context.PositionIs(Lex::TokenKind::OpenParen)) {
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context.AddLeafNode(NodeKind::IdentifierNameBeforeParams, *token);
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context.PushState(State::PatternListAsExplicit);
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} else {
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context.AddLeafNode(NodeKind::IdentifierNameNotBeforeParams, *token);
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}
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}
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auto HandleChoiceAlternativeFinish(Context& context) -> void {
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const auto state = context.PopState();
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if (state.has_error) {
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context.ReturnErrorOnState();
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if (!context.PositionIs(Lex::TokenKind::CloseCurlyBrace)) {
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context.PushState(State::ChoiceAlternative);
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}
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return;
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}
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if (context.ConsumeListToken(
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NodeKind::ChoiceAlternativeListComma, Lex::TokenKind::CloseCurlyBrace,
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state.has_error) == Context::ListTokenKind::Comma) {
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context.PushState(State::ChoiceAlternative);
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}
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}
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auto HandleChoiceDefinitionFinish(Context& context) -> void {
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const auto state = context.PopState();
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context.AddNode(NodeKind::ChoiceDefinition,
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context.ConsumeChecked(Lex::TokenKind::CloseCurlyBrace),
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state.has_error);
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}
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} // namespace Carbon::Parse
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