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70 lines
2.3 KiB
C++
70 lines
2.3 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 <optional>
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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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// Handles ParenConditionAs(If|While|Match).
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static auto HandleParenCondition(Context& context, NodeKind start_kind,
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StateKind finish_state_kind) -> void {
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auto state = context.PopState();
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std::optional<Lex::TokenIndex> open_paren =
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context.ConsumeAndAddOpenParen(state.token, start_kind);
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if (open_paren) {
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state.token = *open_paren;
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}
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context.PushState(state, finish_state_kind);
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if (!open_paren && context.PositionIs(Lex::TokenKind::OpenCurlyBrace)) {
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// For an open curly, assume the condition was completely omitted.
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// Expression parsing would treat the { as a struct, but instead assume it's
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// a code block and just emit an invalid parse.
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context.AddInvalidParse(*context.position());
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} else {
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context.PushState(StateKind::Expr);
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}
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}
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auto HandleParenConditionAsIf(Context& context) -> void {
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HandleParenCondition(context, NodeKind::IfConditionStart,
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StateKind::ParenConditionFinishAsIf);
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}
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auto HandleParenConditionAsWhile(Context& context) -> void {
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HandleParenCondition(context, NodeKind::WhileConditionStart,
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StateKind::ParenConditionFinishAsWhile);
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}
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auto HandleParenConditionAsMatch(Context& context) -> void {
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HandleParenCondition(context, NodeKind::MatchConditionStart,
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StateKind::ParenConditionFinishAsMatch);
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}
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auto HandleParenConditionFinishAsIf(Context& context) -> void {
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auto state = context.PopState();
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context.ConsumeAndAddCloseSymbol(state.token, state, NodeKind::IfCondition);
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}
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auto HandleParenConditionFinishAsWhile(Context& context) -> void {
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auto state = context.PopState();
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context.ConsumeAndAddCloseSymbol(state.token, state,
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NodeKind::WhileCondition);
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}
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auto HandleParenConditionFinishAsMatch(Context& context) -> void {
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auto state = context.PopState();
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context.ConsumeAndAddCloseSymbol(state.token, state,
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NodeKind::MatchCondition);
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}
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} // namespace Carbon::Parse
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