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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
71c91eaf14
Note this is building on #4927 which factors out RegionStack, because this heavily uses the region stack. However, it's a more complex level of logic that appears specific to pattern handling. I've moved InsertHere to pattern_match.cpp because it appears to be in specific use there.
72 lines
2.5 KiB
C++
72 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/check/context.h"
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#include "toolchain/check/handle.h"
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#include "toolchain/check/subpattern.h"
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namespace Carbon::Check {
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auto HandleParseNode(Context& context, Parse::ImplicitParamListStartId node_id)
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-> bool {
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context.node_stack().Push(node_id);
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context.param_and_arg_refs_stack().Push();
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BeginSubpattern(context);
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return true;
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}
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auto HandleParseNode(Context& context, Parse::ImplicitParamListId node_id)
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-> bool {
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if (context.node_stack().PeekIs(Parse::NodeKind::ImplicitParamListStart)) {
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// End the subpattern started by a trailing comma, or the opening delimiter
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// of an empty list.
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EndSubpatternAsEmpty(context);
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}
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// Note the Start node remains on the stack, where the param list handler can
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// make use of it.
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auto refs_id = context.param_and_arg_refs_stack().EndAndPop(
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Parse::NodeKind::ImplicitParamListStart);
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context.node_stack().Push(node_id, refs_id);
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// The implicit parameter list's scope extends to the end of the following
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// parameter list.
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return true;
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}
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auto HandleParseNode(Context& context, Parse::TuplePatternStartId node_id)
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-> bool {
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context.node_stack().Push(node_id);
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context.param_and_arg_refs_stack().Push();
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BeginSubpattern(context);
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// TODO: Remove this branch once the parse tree differentiates between
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// tuple patterns and param patterns.
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if (context.full_pattern_stack().CurrentKind() ==
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FullPatternStack::Kind::ImplicitParamList) {
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context.full_pattern_stack().EndImplicitParamList();
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}
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return true;
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}
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auto HandleParseNode(Context& context, Parse::PatternListCommaId /*node_id*/)
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-> bool {
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context.param_and_arg_refs_stack().ApplyComma();
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BeginSubpattern(context);
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return true;
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}
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auto HandleParseNode(Context& context, Parse::TuplePatternId node_id) -> bool {
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if (context.node_stack().PeekIs(Parse::NodeKind::TuplePatternStart)) {
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// End the subpattern started by a trailing comma, or the opening delimiter
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// of an empty list.
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EndSubpatternAsEmpty(context);
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}
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// Note the Start node remains on the stack, where the param list handler can
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// make use of it.
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auto refs_id = context.param_and_arg_refs_stack().EndAndPop(
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Parse::NodeKind::TuplePatternStart);
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context.node_stack().Push(node_id, refs_id);
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return true;
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}
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} // namespace Carbon::Check
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