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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
5897e57c21
(Split out of #3410) Consistently use `ParenExpr` solely for parenthesized single expressions, and use more syntax-oriented terminology for states and nodes that might represent either a `ParenExpr` or a tuple literal.
78 lines
2.5 KiB
C++
78 lines
2.5 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/parse/context.h"
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namespace Carbon::Parse {
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auto HandleParenExpr(Context& context) -> void {
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auto state = context.PopState();
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// Advance past the open paren.
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context.AddLeafNode(NodeKind::ExprOpenParen,
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context.ConsumeChecked(Lex::TokenKind::OpenParen));
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if (context.PositionIs(Lex::TokenKind::CloseParen)) {
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state.state = State::TupleLiteralFinish;
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context.PushState(state);
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} else {
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state.state = State::ParenExprFinish;
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context.PushState(state);
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context.PushState(State::ExprAfterOpenParenFinish);
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context.PushState(State::Expr);
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}
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}
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auto HandleExprAfterOpenParenFinish(Context& context) -> void {
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auto state = context.PopState();
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auto list_token_kind = context.ConsumeListToken(
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NodeKind::TupleLiteralComma, Lex::TokenKind::CloseParen, state.has_error);
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if (list_token_kind == Context::ListTokenKind::Close) {
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return;
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}
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// We found a comma, so switch parent state to tuple handling.
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auto finish_state = context.PopState();
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CARBON_CHECK(finish_state.state == State::ParenExprFinish)
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<< "Unexpected parent state, found: " << finish_state.state;
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finish_state.state = State::TupleLiteralFinish;
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context.PushState(finish_state);
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// If the comma is not immediately followed by a close paren, push handlers
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// for the next tuple element.
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if (list_token_kind != Context::ListTokenKind::CommaClose) {
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state.state = State::TupleLiteralElementFinish;
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context.PushState(state);
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context.PushState(State::Expr);
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}
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}
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auto HandleTupleLiteralElementFinish(Context& context) -> void {
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auto state = context.PopState();
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if (context.ConsumeListToken(NodeKind::TupleLiteralComma,
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Lex::TokenKind::CloseParen, state.has_error) ==
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Context::ListTokenKind::Comma) {
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context.PushState(state);
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context.PushState(State::Expr);
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}
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}
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auto HandleParenExprFinish(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::ParenExpr, context.Consume(), state.subtree_start,
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state.has_error);
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}
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auto HandleTupleLiteralFinish(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::TupleLiteral, 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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