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79 lines
2.6 KiB
C++
79 lines
2.6 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/lex/token_kind.h"
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#include "toolchain/lex/tokenized_buffer.h"
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#include "toolchain/parse/context.h"
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#include "toolchain/parse/handle.h"
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#include "toolchain/parse/node_kind.h"
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#include "toolchain/parse/state.h"
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namespace Carbon::Parse {
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auto HandleFormLiteral(Context& context) -> void {
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auto state = context.PopState();
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auto keyword = context.ConsumeChecked(Lex::TokenKind::Form);
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context.AddLeafNode(NodeKind::FormLiteralKeyword, keyword);
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if (auto paren = context.ConsumeAndAddOpenParen(
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keyword, NodeKind::FormLiteralOpenParen)) {
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// Stash the open paren token for use by ConsumeAndAddCloseSymbol.
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state.token = *paren;
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} else {
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state.has_error = true;
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}
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context.PushState(state, StateKind::FormLiteralFinish);
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if (state.has_error) {
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context.AddInvalidParse(keyword);
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} else {
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context.PushState(StateKind::PrimitiveForm, keyword);
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}
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}
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auto HandlePrimitiveForm(Context& context) -> void {
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auto state = context.PopState();
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if (context.PositionIs(Lex::TokenKind::Ref) ||
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context.PositionIs(Lex::TokenKind::Var) ||
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context.PositionIs(Lex::TokenKind::Val)) {
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state.token = context.Consume();
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} else {
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CARBON_DIAGNOSTIC(ExpectedCategoryModifier, Error,
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"expected `ref`, `var`, or `val` after `form(`");
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context.emitter().Emit(*context.position(), ExpectedCategoryModifier);
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state.has_error = true;
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}
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context.PushState(state, StateKind::PrimitiveFormFinish);
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context.PushState(StateKind::Expr);
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}
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auto HandlePrimitiveFormFinish(Context& context) -> void {
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auto state = context.PopState();
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// Arbitrary default, only used in error recovery.
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auto node_kind = NodeKind::ValPrimitiveForm;
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switch (context.tokens().GetKind(state.token)) {
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case Lex::TokenKind::Ref:
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node_kind = NodeKind::RefPrimitiveForm;
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break;
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case Lex::TokenKind::Var:
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node_kind = NodeKind::VarPrimitiveForm;
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break;
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case Lex::TokenKind::Val:
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node_kind = NodeKind::ValPrimitiveForm;
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break;
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default:
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CARBON_CHECK(state.has_error);
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// Use the default node_kind set earlier for error recovery.
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break;
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}
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context.AddNode(node_kind, state.token, state.has_error);
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}
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auto HandleFormLiteralFinish(Context& context) -> void {
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auto state = context.PopState();
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context.ConsumeAndAddCloseSymbol(state, NodeKind::FormLiteral);
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}
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} // namespace Carbon::Parse
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