mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Geoff Romer
943acf1ec2
This is a step toward making binding pattern handling more robust, by removing its reliance on the node stack for context.
105 lines
3.9 KiB
C++
105 lines
3.9 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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#include "toolchain/parse/handle.h"
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namespace Carbon::Parse {
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// Handles PatternListElementAs(Implicit|Tuple).
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static auto HandlePatternListElement(Context& context, State pattern_state,
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State finish_state) -> void {
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auto state = context.PopState();
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context.PushStateForPattern(finish_state, state.in_var_pattern);
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context.PushStateForPattern(pattern_state, state.in_var_pattern);
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}
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auto HandlePatternListElementAsImplicit(Context& context) -> void {
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HandlePatternListElement(context, State::BindingPattern,
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State::PatternListElementFinishAsImplicit);
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}
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auto HandlePatternListElementAsTuple(Context& context) -> void {
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HandlePatternListElement(context, State::BindingPattern,
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State::PatternListElementFinishAsTuple);
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}
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// Handles PatternListElementFinishAs(Implicit|Tuple).
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static auto HandlePatternListElementFinish(Context& context,
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Lex::TokenKind close_token,
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State param_state) -> void {
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auto state = context.PopState();
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if (state.has_error) {
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context.ReturnErrorOnState();
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}
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if (context.ConsumeListToken(NodeKind::PatternListComma, close_token,
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state.has_error) ==
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Context::ListTokenKind::Comma) {
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context.PushStateForPattern(param_state, state.in_var_pattern);
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}
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}
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auto HandlePatternListElementFinishAsImplicit(Context& context) -> void {
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HandlePatternListElementFinish(context, Lex::TokenKind::CloseSquareBracket,
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State::PatternListElementAsImplicit);
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}
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auto HandlePatternListElementFinishAsTuple(Context& context) -> void {
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HandlePatternListElementFinish(context, Lex::TokenKind::CloseParen,
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State::PatternListElementAsTuple);
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}
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// Handles PatternListAs(Implicit|Tuple).
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static auto HandlePatternList(Context& context, NodeKind node_kind,
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Lex::TokenKind open_token_kind,
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Lex::TokenKind close_token_kind,
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State param_state, State finish_state) -> void {
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auto state = context.PopState();
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context.PushStateForPattern(finish_state, state.in_var_pattern);
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context.AddLeafNode(node_kind, context.ConsumeChecked(open_token_kind));
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if (!context.PositionIs(close_token_kind)) {
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context.PushStateForPattern(param_state, state.in_var_pattern);
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}
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}
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auto HandlePatternListAsImplicit(Context& context) -> void {
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HandlePatternList(
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context, NodeKind::ImplicitParamListStart,
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Lex::TokenKind::OpenSquareBracket, Lex::TokenKind::CloseSquareBracket,
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State::PatternListElementAsImplicit, State::PatternListFinishAsImplicit);
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}
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auto HandlePatternListAsTuple(Context& context) -> void {
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HandlePatternList(context, NodeKind::TuplePatternStart,
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Lex::TokenKind::OpenParen, Lex::TokenKind::CloseParen,
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State::PatternListElementAsTuple,
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State::PatternListFinishAsTuple);
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}
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// Handles PatternListFinishAs(Implicit|Tuple).
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static auto HandlePatternListFinish(Context& context, NodeKind node_kind,
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Lex::TokenKind token_kind) -> void {
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auto state = context.PopState();
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context.AddNode(node_kind, context.ConsumeChecked(token_kind),
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state.has_error);
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}
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auto HandlePatternListFinishAsImplicit(Context& context) -> void {
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HandlePatternListFinish(context, NodeKind::ImplicitParamList,
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Lex::TokenKind::CloseSquareBracket);
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}
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auto HandlePatternListFinishAsTuple(Context& context) -> void {
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HandlePatternListFinish(context, NodeKind::TuplePattern,
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Lex::TokenKind::CloseParen);
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}
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} // namespace Carbon::Parse
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