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Parsing for pointer types and pointer operators. (#3026)

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This provides parsing support for the functionality added in #2006.
This commit is contained in:
Richard Smith
2023-07-26 21:24:54 +00:00
committed by GitHub
parent b783197ec6
commit c4b880c6ef
18 changed files with 450 additions and 75 deletions
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toolchain/parser/parser_handle_period.cpp
+21 -9
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@@ -6,21 +6,25 @@
namespace Carbon {
// Handles PeriodAs variants.
// Handles PeriodAs variants and ArrowExpression.
// TODO: This currently only supports identifiers on the rhs, but will in the
// future need to handle things like `object.(Interface.member)` for qualifiers.
auto ParserHandlePeriod(ParserContext& context, ParseNodeKind node_kind)
static auto ParserHandlePeriodOrArrow(ParserContext& context,
ParseNodeKind node_kind, bool is_arrow)
-> void {
auto state = context.PopState();
// `.` identifier
auto dot = context.ConsumeChecked(TokenKind::Period);
auto dot = context.ConsumeChecked(is_arrow ? TokenKind::MinusGreater
: TokenKind::Period);
if (!context.ConsumeAndAddLeafNodeIf(TokenKind::Identifier,
ParseNodeKind::Name)) {
CARBON_DIAGNOSTIC(ExpectedIdentifierAfterDot, Error,
"Expected identifier after `.`.");
context.emitter().Emit(*context.position(), ExpectedIdentifierAfterDot);
CARBON_DIAGNOSTIC(ExpectedIdentifierAfterDotOrArrow, Error,
"Expected identifier after `{0}`.", llvm::StringRef);
context.emitter().Emit(*context.position(),
ExpectedIdentifierAfterDotOrArrow,
is_arrow ? "->" : ".");
// If we see a keyword, assume it was intended to be a name.
// TODO: Should keywords be valid here?
if (context.PositionKind().is_keyword()) {
@@ -39,15 +43,23 @@ auto ParserHandlePeriod(ParserContext& context, ParseNodeKind node_kind)
}
auto ParserHandlePeriodAsDeclaration(ParserContext& context) -> void {
ParserHandlePeriod(context, ParseNodeKind::QualifiedDeclaration);
ParserHandlePeriodOrArrow(context, ParseNodeKind::QualifiedDeclaration,
/*is_arrow=*/false);
}
auto ParserHandlePeriodAsExpression(ParserContext& context) -> void {
ParserHandlePeriod(context, ParseNodeKind::MemberAccessExpression);
ParserHandlePeriodOrArrow(context, ParseNodeKind::MemberAccessExpression,
/*is_arrow=*/false);
}
auto ParserHandlePeriodAsStruct(ParserContext& context) -> void {
ParserHandlePeriod(context, ParseNodeKind::StructFieldDesignator);
ParserHandlePeriodOrArrow(context, ParseNodeKind::StructFieldDesignator,
/*is_arrow=*/false);
}
auto ParserHandleArrowExpression(ParserContext& context) -> void {
ParserHandlePeriodOrArrow(
context, ParseNodeKind::PointerMemberAccessExpression, /*is_arrow=*/true);
}
} // namespace Carbon