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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-PerkinsandRichard Smith
c9458fe30a
This detects ordering issues with the `package` and `import` statements. `library` is changed from package-specific to instead be generic between the two, since structurally it's non-specific. The next step would be to start exposing the results for the driver to make ordering decisions for checking. That'll involve further modifications to this code, but this felt like a reasonable change point because it's the extent of the parser enforcement, and still causes significant refactoring. --------- Co-authored-by: Richard Smith <richard@metafoo.co.uk>
97 lines
3.4 KiB
C++
97 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/parse/context.h"
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namespace Carbon::Parse {
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// Handles an unrecognized declaration, adding an error node.
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static auto HandleUnrecognizedDeclaration(Context& context) -> void {
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CARBON_DIAGNOSTIC(UnrecognizedDeclaration, Error,
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"Unrecognized declaration introducer.");
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context.emitter().Emit(*context.position(), UnrecognizedDeclaration);
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auto cursor = *context.position();
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auto semi = context.SkipPastLikelyEnd(cursor);
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// Locate the EmptyDeclaration at the semi when found, but use the
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// original cursor location for an error when not.
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context.AddLeafNode(NodeKind::EmptyDeclaration, semi ? *semi : cursor,
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/*has_error=*/true);
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}
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auto HandleDeclarationScopeLoop(Context& context) -> void {
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// This maintains the current state unless we're at the end of the scope.
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switch (auto position_kind = context.PositionKind()) {
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case Lex::TokenKind::CloseCurlyBrace:
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case Lex::TokenKind::EndOfFile: {
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// This is the end of the scope, so the loop state ends.
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context.PopAndDiscardState();
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break;
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}
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// `import` and `package` manage their packaging state.
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case Lex::TokenKind::Import: {
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context.PushState(State::Import);
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break;
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}
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case Lex::TokenKind::Package: {
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context.PushState(State::Package);
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break;
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}
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default:
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// Because a non-packaging keyword was encountered, packaging is complete.
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// Misplaced packaging keywords may lead to this being re-triggered.
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if (context.packaging_state() !=
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Context::PackagingState::AfterNonPackagingDeclaration) {
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if (!context.first_non_packaging_token().is_valid()) {
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context.set_first_non_packaging_token(*context.position());
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}
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context.set_packaging_state(
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Context::PackagingState::AfterNonPackagingDeclaration);
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}
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switch (position_kind) {
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// Remaining keywords are only valid after imports are complete, and
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// so all result in a `set_packaging_state` call. Note, this may not
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// always be necessary but is probably cheaper than validating.
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case Lex::TokenKind::Class: {
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context.PushState(State::TypeIntroducerAsClass);
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break;
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}
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case Lex::TokenKind::Constraint: {
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context.PushState(State::TypeIntroducerAsNamedConstraint);
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break;
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}
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case Lex::TokenKind::Fn: {
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context.PushState(State::FunctionIntroducer);
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break;
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}
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case Lex::TokenKind::Interface: {
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context.PushState(State::TypeIntroducerAsInterface);
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break;
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}
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case Lex::TokenKind::Namespace: {
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context.PushState(State::Namespace);
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break;
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}
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case Lex::TokenKind::Semi: {
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context.AddLeafNode(NodeKind::EmptyDeclaration, context.Consume());
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break;
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}
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case Lex::TokenKind::Var: {
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context.PushState(State::VarAsSemicolon);
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break;
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}
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case Lex::TokenKind::Let: {
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context.PushState(State::Let);
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break;
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}
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default: {
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HandleUnrecognizedDeclaration(context);
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break;
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}
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}
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}
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}
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} // namespace Carbon::Parse
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