mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Geoff RomerandRichard Smith
a112cbde5c
This is a precondition for enabling the new pattern-matching subsystem to support binding patterns that have `if` expressions in the type position. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
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
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "toolchain/check/context.h"
|
|
#include "toolchain/check/handle.h"
|
|
|
|
namespace Carbon::Check {
|
|
|
|
auto HandleParseNode(Context& context, Parse::ImplicitParamListStartId node_id)
|
|
-> bool {
|
|
context.node_stack().Push(node_id);
|
|
context.param_and_arg_refs_stack().Push();
|
|
context.BeginSubpattern();
|
|
return true;
|
|
}
|
|
|
|
auto HandleParseNode(Context& context, Parse::ImplicitParamListId node_id)
|
|
-> bool {
|
|
if (context.node_stack().PeekIs<Parse::NodeKind::ImplicitParamListStart>()) {
|
|
// End the subpattern started by a trailing comma, or the opening delimiter
|
|
// of an empty list.
|
|
context.EndSubpatternAsEmpty();
|
|
}
|
|
// Note the Start node remains on the stack, where the param list handler can
|
|
// make use of it.
|
|
auto refs_id = context.param_and_arg_refs_stack().EndAndPop(
|
|
Parse::NodeKind::ImplicitParamListStart);
|
|
context.node_stack().Push(node_id, refs_id);
|
|
// The implicit parameter list's scope extends to the end of the following
|
|
// parameter list.
|
|
return true;
|
|
}
|
|
|
|
static auto HandleTuplePatternStart(Context& context, Parse::NodeId node_id)
|
|
-> bool {
|
|
context.node_stack().Push(node_id);
|
|
context.param_and_arg_refs_stack().Push();
|
|
context.BeginSubpattern();
|
|
return true;
|
|
}
|
|
|
|
auto HandleParseNode(Context& context, Parse::TuplePatternStartId node_id)
|
|
-> bool {
|
|
return HandleTuplePatternStart(context, node_id);
|
|
}
|
|
|
|
auto HandleParseNode(Context& context, Parse::PatternListCommaId /*node_id*/)
|
|
-> bool {
|
|
context.param_and_arg_refs_stack().ApplyComma();
|
|
context.BeginSubpattern();
|
|
return true;
|
|
}
|
|
|
|
auto HandleParseNode(Context& context, Parse::TuplePatternId node_id) -> bool {
|
|
if (context.node_stack().PeekIs(Parse::NodeKind::TuplePatternStart)) {
|
|
// End the subpattern started by a trailing comma, or the opening delimiter
|
|
// of an empty list.
|
|
context.EndSubpatternAsEmpty();
|
|
}
|
|
// Note the Start node remains on the stack, where the param list handler can
|
|
// make use of it.
|
|
auto refs_id = context.param_and_arg_refs_stack().EndAndPop(
|
|
Parse::NodeKind::TuplePatternStart);
|
|
context.node_stack().Push(node_id, refs_id);
|
|
return true;
|
|
}
|
|
|
|
} // namespace Carbon::Check
|