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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Ross-Perkins
4f10735751
This change splits `NodeKind::IdentifierName` into separate node kinds depending on whether the identifier is followed by parameters, and similarly splits `NameQualifier` based on whether the qualifier has parameters. This enables us to only push a pattern block when it's actually needed, rather than "defensively" pushing one when it might be needed. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
94 lines
3.3 KiB
C++
94 lines
3.3 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 HandleDeclNameAndParams(Context& context) -> void {
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auto state = context.PopState();
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auto identifier = context.ConsumeIf(Lex::TokenKind::Identifier);
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if (!identifier) {
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Lex::TokenIndex token = *context.position();
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if (context.tokens().GetKind(token) == Lex::TokenKind::FileEnd) {
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// The end of file is an unhelpful diagnostic location. Instead, use the
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// introducer token.
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token = state.token;
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}
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if (state.token == *context.position()) {
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CARBON_DIAGNOSTIC(ExpectedDeclNameAfterPeriod, Error,
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"`.` should be followed by a name");
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context.emitter().Emit(token, ExpectedDeclNameAfterPeriod);
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} else {
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CARBON_DIAGNOSTIC(ExpectedDeclName, Error,
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"`{0}` introducer should be followed by a name",
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Lex::TokenKind);
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context.emitter().Emit(token, ExpectedDeclName,
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context.tokens().GetKind(state.token));
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}
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context.ReturnErrorOnState();
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context.AddInvalidParse(*context.position());
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return;
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}
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switch (context.PositionKind()) {
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case Lex::TokenKind::Period:
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context.AddLeafNode(NodeKind::IdentifierNameNotBeforeParams, *identifier);
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context.AddNode(NodeKind::NameQualifierWithoutParams,
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context.ConsumeChecked(Lex::TokenKind::Period),
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state.has_error);
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context.PushState(State::DeclNameAndParams);
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break;
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case Lex::TokenKind::OpenSquareBracket:
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context.AddLeafNode(NodeKind::IdentifierNameBeforeParams, *identifier);
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state.state = State::DeclNameAndParamsAfterImplicit;
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context.PushState(state);
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context.PushState(State::PatternListAsImplicit);
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break;
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case Lex::TokenKind::OpenParen:
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context.AddLeafNode(NodeKind::IdentifierNameBeforeParams, *identifier);
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state.state = State::DeclNameAndParamsAfterParams;
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context.PushState(state);
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context.PushState(State::PatternListAsTuple);
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break;
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default:
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context.AddLeafNode(NodeKind::IdentifierNameNotBeforeParams, *identifier);
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break;
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}
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}
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auto HandleDeclNameAndParamsAfterImplicit(Context& context) -> void {
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auto state = context.PopState();
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if (!context.PositionIs(Lex::TokenKind::OpenParen)) {
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CARBON_DIAGNOSTIC(
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ParamsRequiredAfterImplicit, Error,
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"a `(` for parameters is required after implicit parameters");
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context.emitter().Emit(*context.position(), ParamsRequiredAfterImplicit);
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context.ReturnErrorOnState();
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return;
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}
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state.state = State::DeclNameAndParamsAfterParams;
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context.PushState(state);
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context.PushState(State::PatternListAsTuple);
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}
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auto HandleDeclNameAndParamsAfterParams(Context& context) -> void {
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auto state = context.PopState();
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if (auto period = context.ConsumeIf(Lex::TokenKind::Period)) {
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context.AddNode(NodeKind::NameQualifierWithParams, *period,
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state.has_error);
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context.PushState(State::DeclNameAndParams);
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}
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}
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} // namespace Carbon::Parse
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