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Jon Ross-Perkins
096f1dc68a
This is something I noticed working on https://github.com/carbon-language/carbon-lang/pull/3884; I think we have more functions named Diagnose* at present than Emit* or Report*, so just trying to consolidate. Note a couple Diagnose* functions do a little more validation, but maybe those should actually be renamed away (zygoloid had mentioned wanting to generally split out diagnostics to their own function, and then we'd have it be a more common pattern).
52 lines
1.5 KiB
C++
52 lines
1.5 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/parse/context.h"
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namespace Carbon::Parse {
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auto HandleLet(Context& context) -> void {
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auto state = context.PopState();
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// These will start at the `let`.
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context.PushState(state, State::LetFinish);
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context.PushState(state, State::LetAfterPattern);
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// This will start at the pattern.
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context.PushState(State::Pattern);
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}
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auto HandleLetAfterPattern(Context& context) -> void {
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auto state = context.PopState();
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if (state.has_error) {
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if (auto after_pattern =
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context.FindNextOf({Lex::TokenKind::Equal, Lex::TokenKind::Semi})) {
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context.SkipTo(*after_pattern);
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}
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}
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if (auto equals = context.ConsumeIf(Lex::TokenKind::Equal)) {
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context.AddLeafNode(NodeKind::LetInitializer, *equals);
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context.PushState(State::Expr);
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}
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}
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auto HandleLetFinish(Context& context) -> void {
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auto state = context.PopState();
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auto end_token = state.token;
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if (context.PositionIs(Lex::TokenKind::Semi)) {
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end_token = context.Consume();
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} else {
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context.DiagnoseExpectedDeclSemi(Lex::TokenKind::Let);
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state.has_error = true;
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end_token = context.SkipPastLikelyEnd(state.token);
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}
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context.AddNode(NodeKind::LetDecl, end_token, state.subtree_start,
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state.has_error);
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}
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} // namespace Carbon::Parse
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