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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
1437b0e26d
Adds `BindAlias` with a hybrid of `BindName` and `NameRef` semantics. I think it's slightly closer to `BindName` because it introduces a name, so I'm going more in that direction. This also matches the need for `bind_name_id` with imports on enclosing scopes. Note, only things that look like a name reference are being allowed on the RHS of `alias`. This includes builtins that look like name references, such as `bool`, but not ones that turn into values underneath, such as `false`.
62 lines
2.0 KiB
C++
62 lines
2.0 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/node_kind.h"
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#include "toolchain/parse/state.h"
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namespace Carbon::Parse {
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auto HandleAlias(Context& context) -> void {
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auto state = context.PopState();
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context.PushState(state, State::AliasAfterName);
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context.PushState(State::DeclNameAndParamsAsNone, state.token);
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}
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auto HandleAliasAfterName(Context& context) -> void {
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auto state = context.PopState();
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if (state.has_error) {
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context.RecoverFromDeclError(state, NodeKind::Alias,
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/*skip_past_likely_end=*/true);
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return;
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}
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if (auto equal = context.ConsumeIf(Lex::TokenKind::Equal)) {
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context.AddLeafNode(NodeKind::AliasInitializer, *equal);
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context.PushState(state, State::AliasFinish);
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context.PushState(State::Expr);
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} else {
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CARBON_DIAGNOSTIC(ExpectedAliasInitializer, Error,
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"`alias` requires a `=` for the source.");
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context.emitter().Emit(*context.position(), ExpectedAliasInitializer);
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context.RecoverFromDeclError(state, NodeKind::Alias,
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/*skip_past_likely_end=*/true);
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}
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}
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auto HandleAliasFinish(Context& context) -> void {
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auto state = context.PopState();
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if (state.has_error) {
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context.RecoverFromDeclError(state, NodeKind::Alias,
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/*skip_past_likely_end=*/true);
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return;
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}
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if (auto semi = context.ConsumeIf(Lex::TokenKind::Semi)) {
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context.AddNode(NodeKind::Alias, *semi, state.subtree_start,
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state.has_error);
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} else {
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context.EmitExpectedDeclSemi(Lex::TokenKind::Alias);
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context.RecoverFromDeclError(state, NodeKind::Alias,
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/*skip_past_likely_end=*/true);
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}
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}
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} // namespace Carbon::Parse
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