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josh11bandJon Ross-Perkins
c53b248800
Part of switching to the [abbreviations we've decided to use](https://docs.google.com/document/d/1RRYMm42osyqhI2LyjrjockYCutQ5dOf8Abu50kTrkX0/edit?resourcekey=0-kHyqOESbOHmzZphUbtLrTw#heading=h.pph7i5m5un7q). I will rename files in a follow-up PR. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
95 lines
3.3 KiB
C++
95 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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namespace Carbon::Parse {
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auto HandleFunctionIntroducer(Context& context) -> void {
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auto state = context.PopState();
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context.AddLeafNode(NodeKind::FunctionIntroducer, context.Consume());
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state.state = State::FunctionAfterParams;
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context.PushState(state);
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context.PushState(State::DeclNameAndParamsAsRequired, state.token);
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}
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auto HandleFunctionAfterParams(Context& 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 = State::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 node.
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if (context.PositionIs(Lex::TokenKind::MinusGreater)) {
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context.PushState(State::FunctionReturnTypeFinish);
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context.ConsumeAndDiscard();
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context.PushStateForExpr(PrecedenceGroup::ForType());
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}
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}
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auto HandleFunctionReturnTypeFinish(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::ReturnType, state.token, state.subtree_start,
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state.has_error);
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}
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auto HandleFunctionSignatureFinish(Context& context) -> void {
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auto state = context.PopState();
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switch (context.PositionKind()) {
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case Lex::TokenKind::Semi: {
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context.AddNode(NodeKind::FunctionDecl, 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 Lex::TokenKind::OpenCurlyBrace: {
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if (auto decl_context = context.GetDeclContext();
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decl_context == Context::DeclContext::Interface ||
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decl_context == Context::DeclContext::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.RecoverFromDeclError(state, NodeKind::FunctionDecl,
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/*skip_past_likely_end=*/true);
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break;
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}
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context.AddNode(NodeKind::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 = State::FunctionDefinitionFinish;
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context.PushState(state);
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context.PushState(State::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.EmitExpectedDeclSemiOrDefinition(Lex::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.RecoverFromDeclError(state, NodeKind::FunctionDecl,
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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 HandleFunctionDefinitionFinish(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::FunctionDefinition, context.Consume(),
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state.subtree_start, state.has_error);
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}
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} // namespace Carbon::Parse
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