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https://github.com/carbon-language/carbon-lang.git
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Richard SmithandJon Ross-Perkins
28170c7867
Parse the name of a declaration as a sequence of `NameQualifier`s -- which have a name, possibly parameters, and a trailing period -- followed by a name and possibly parameters. This prepares us for parsing declarations of members of generic classes and similar cases, but actually supporting such member redeclarations is left to a future change. We previously required functions to have parameters, but no longer do, following the direction of #3848. Cases like namespaces that can't actually have parameters are now diagnosed in check instead of in parse. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
101 lines
3.7 KiB
C++
101 lines
3.7 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.PushState(state, State::FunctionAfterParams);
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context.PushState(State::DeclNameAndParams, 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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context.PushState(state, State::FunctionSignatureFinish);
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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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context.AddFunctionDefinitionStart(context.Consume(), state.subtree_start,
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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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context.PushState(state, State::FunctionDefinitionFinish);
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context.PushState(State::StatementScopeLoop);
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break;
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}
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case Lex::TokenKind::Equal: {
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context.AddNode(NodeKind::BuiltinFunctionDefinitionStart,
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context.Consume(), state.subtree_start, state.has_error);
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if (!context.ConsumeAndAddLeafNodeIf(Lex::TokenKind::StringLiteral,
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NodeKind::BuiltinName)) {
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CARBON_DIAGNOSTIC(ExpectedBuiltinName, Error,
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"Expected builtin function name after `=`.");
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context.emitter().Emit(*context.position(), ExpectedBuiltinName);
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state.has_error = true;
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}
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auto semi = context.ConsumeIf(Lex::TokenKind::Semi);
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if (!semi && !state.has_error) {
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context.DiagnoseExpectedDeclSemi(context.tokens().GetKind(state.token));
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state.has_error = true;
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}
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if (state.has_error) {
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context.RecoverFromDeclError(state, NodeKind::BuiltinFunctionDefinition,
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/*skip_past_likely_end=*/true);
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} else {
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context.AddNode(NodeKind::BuiltinFunctionDefinition, *semi,
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state.subtree_start, state.has_error);
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}
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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.DiagnoseExpectedDeclSemiOrDefinition(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.AddFunctionDefinition(context.Consume(), state.subtree_start,
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state.has_error);
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}
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} // namespace Carbon::Parse
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