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https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Ross-Perkins
74e1a9949f
Parameter lists need substantially different treatment than tuple patterns in other contexts, so this change splits them into separate parse node kinds. --------- Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
100 lines
3.4 KiB
C++
100 lines
3.4 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/inst.h"
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#include "toolchain/check/subpattern.h"
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#include "toolchain/check/type.h"
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namespace Carbon::Check {
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// Handle the start of any kind of pattern list.
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static auto HandlePatternListStart(Context& context, Parse::NodeId 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::ImplicitParamListStartId node_id)
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-> bool {
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return HandlePatternListStart(context, node_id);
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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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return HandlePatternListStart(context, node_id);
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}
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auto HandleParseNode(Context& context, Parse::ExplicitParamListStartId node_id)
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-> bool {
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context.full_pattern_stack().EndImplicitParamList();
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return HandlePatternListStart(context, node_id);
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}
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// Handle the end of any kind of parameter list (tuple patterns have separate
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// logic).
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static auto HandleParamListEnd(Context& context, Parse::NodeId node_id,
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Parse::NodeKind start_kind) -> bool {
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if (context.node_stack().PeekIs(start_kind)) {
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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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EndSubpatternAsNonExpr(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(start_kind);
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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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auto HandleParseNode(Context& context, Parse::ImplicitParamListId node_id)
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-> bool {
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return HandleParamListEnd(context, node_id,
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Parse::NodeKind::ImplicitParamListStart);
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}
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auto HandleParseNode(Context& context, Parse::ExplicitParamListId node_id)
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-> bool {
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return HandleParamListEnd(context, node_id,
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Parse::NodeKind::ExplicitParamListStart);
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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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EndSubpatternAsNonExpr(context);
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}
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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()
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.PopAndDiscardSoloNodeId<Parse::NodeKind::TuplePatternStart>();
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const auto& inst_block = context.inst_blocks().Get(refs_id);
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llvm::SmallVector<SemIR::TypeId> type_ids;
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type_ids.reserve(inst_block.size());
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for (auto inst : inst_block) {
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type_ids.push_back(context.insts().Get(inst).type_id());
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}
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auto type_id = GetTupleType(context, type_ids);
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context.node_stack().Push(
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node_id,
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AddPatternInst<SemIR::TuplePattern>(
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context, node_id, {.type_id = type_id, .elements_id = refs_id}));
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EndSubpatternAsNonExpr(context);
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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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} // namespace Carbon::Check
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