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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
8ad08e34e2
This is addressing an issue left behind by the context switch, removing a few diagnostics that had been in the header rather than figuring out proper homes. I'm splitting one for semis a little further, sharing one, and then the other two are actually able to be moved into more specific homes as-is (one is only used in one place, clearly an oversight that it wasn't there already).
97 lines
3.5 KiB
C++
97 lines
3.5 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/parser/parser_context.h"
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namespace Carbon {
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auto ParserHandleFunctionIntroducer(ParserContext& context) -> void {
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auto state = context.PopState();
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context.AddLeafNode(ParseNodeKind::FunctionIntroducer, context.Consume());
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state.state = ParserState::FunctionAfterParameters;
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context.PushState(state);
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state.state = ParserState::DeclarationNameAndParamsAsRequired;
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context.PushState(state);
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}
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auto ParserHandleFunctionAfterParameters(ParserContext& context) -> void {
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auto state = context.PopState();
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// Regardless of whether there's a return type, we'll finish the signature.
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state.state = ParserState::FunctionSignatureFinish;
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context.PushState(state);
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// If there is a return type, parse the expression before adding the return
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// type nod.e
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if (context.PositionIs(TokenKind::MinusGreater)) {
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context.PushState(ParserState::FunctionReturnTypeFinish);
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++context.position();
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context.PushStateForExpression(PrecedenceGroup::ForType());
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}
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}
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auto ParserHandleFunctionReturnTypeFinish(ParserContext& context) -> void {
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auto state = context.PopState();
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context.AddNode(ParseNodeKind::ReturnType, state.token, state.subtree_start,
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state.has_error);
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}
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auto ParserHandleFunctionSignatureFinish(ParserContext& context) -> void {
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auto state = context.PopState();
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switch (context.PositionKind()) {
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case TokenKind::Semi: {
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context.AddNode(ParseNodeKind::FunctionDeclaration, context.Consume(),
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state.subtree_start, state.has_error);
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break;
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}
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case TokenKind::OpenCurlyBrace: {
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if (auto decl_context = context.GetDeclarationContext();
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decl_context == ParserContext::DeclarationContext::Interface ||
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decl_context == ParserContext::DeclarationContext::NamedConstraint) {
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CARBON_DIAGNOSTIC(
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MethodImplNotAllowed, Error,
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"Method implementations are not allowed in interfaces.");
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context.emitter().Emit(*context.position(), MethodImplNotAllowed);
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context.RecoverFromDeclarationError(state,
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ParseNodeKind::FunctionDeclaration,
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/*skip_past_likely_end=*/true);
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break;
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}
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context.AddNode(ParseNodeKind::FunctionDefinitionStart, context.Consume(),
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state.subtree_start, state.has_error);
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// Any error is recorded on the FunctionDefinitionStart.
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state.has_error = false;
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state.state = ParserState::FunctionDefinitionFinish;
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context.PushState(state);
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context.PushState(ParserState::StatementScopeLoop);
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break;
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}
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default: {
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if (!state.has_error) {
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context.EmitExpectedDeclarationSemiOrDefinition(TokenKind::Fn);
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}
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// Only need to skip if we've not already found a new line.
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bool skip_past_likely_end =
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context.tokens().GetLine(*context.position()) ==
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context.tokens().GetLine(state.token);
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context.RecoverFromDeclarationError(
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state, ParseNodeKind::FunctionDeclaration, skip_past_likely_end);
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break;
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}
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}
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}
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auto ParserHandleFunctionDefinitionFinish(ParserContext& context) -> void {
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auto state = context.PopState();
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context.AddNode(ParseNodeKind::FunctionDefinition, context.Consume(),
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state.subtree_start, state.has_error);
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}
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} // namespace Carbon
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