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https://github.com/carbon-language/carbon-lang.git
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Geoff Romer
8c113c1241
Also renames variables of that type to match. A follow-up PR will rename `Parse::StateStackEntry` to `Parse::State`. This is more consistent with the naming of similar enums elsewhere in the toolchain, and with the prevailing practice of using `state` rather than e.g. `entry` as the name of a `StateStackEntry`. See also discussion [here](https://discord.com/channels/655572317891461132/963846118964350976/1326280585592700990)
73 lines
2.5 KiB
C++
73 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/lex/token_kind.h"
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#include "toolchain/parse/context.h"
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#include "toolchain/parse/handle.h"
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namespace Carbon::Parse {
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auto HandleIfExprFinishCondition(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::IfExprIf, state.token, state.has_error);
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if (context.PositionIs(Lex::TokenKind::Then)) {
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context.PushState(StateKind::IfExprFinishThen);
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context.ConsumeChecked(Lex::TokenKind::Then);
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context.PushStateForExpr(*PrecedenceGroup::ForLeading(Lex::TokenKind::If));
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} else {
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// TODO: Include the location of the `if` token.
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CARBON_DIAGNOSTIC(ExpectedThenAfterIf, Error,
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"expected `then` after `if` condition");
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if (!state.has_error) {
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context.emitter().Emit(*context.position(), ExpectedThenAfterIf);
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}
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// Add invalid nodes to substitute for `IfExprThen` and the final `Expr`.
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context.AddInvalidParse(*context.position());
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context.AddInvalidParse(*context.position());
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context.ReturnErrorOnState();
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}
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}
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auto HandleIfExprFinishThen(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::IfExprThen, state.token, state.has_error);
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if (context.PositionIs(Lex::TokenKind::Else)) {
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context.PushState(StateKind::IfExprFinishElse);
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context.ConsumeChecked(Lex::TokenKind::Else);
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context.PushStateForExpr(*PrecedenceGroup::ForLeading(Lex::TokenKind::If));
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} else {
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// TODO: Include the location of the `if` token.
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CARBON_DIAGNOSTIC(ExpectedElseAfterIf, Error,
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"expected `else` after `if ... then ...`");
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if (!state.has_error) {
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context.emitter().Emit(*context.position(), ExpectedElseAfterIf);
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}
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// Add an invalid node to substitute for the final `Expr`.
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context.AddInvalidParse(*context.position());
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context.ReturnErrorOnState();
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}
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}
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auto HandleIfExprFinishElse(Context& context) -> void {
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auto else_state = context.PopState();
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// Propagate the location of `else`.
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auto if_state = context.PopState();
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if_state.token = else_state.token;
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if_state.has_error |= else_state.has_error;
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context.PushState(if_state);
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}
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auto HandleIfExprFinish(Context& context) -> void {
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auto state = context.PopState();
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context.AddNode(NodeKind::IfExprElse, state.token, state.has_error);
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}
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} // namespace Carbon::Parse
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