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ParseType.cpp
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//===--- ParseType.cpp - Swift Language Parser for Types ------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Type Parsing and AST Building
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Attr.h"
#include "swift/AST/GenericParamList.h"
#include "swift/AST/SourceFile.h" // only for isMacroSignatureFile
#include "swift/AST/TypeRepr.h"
#include "swift/Basic/Nullability.h"
#include "swift/Parse/IDEInspectionCallbacks.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/Parser.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/SaveAndRestore.h"
using namespace swift;
TypeRepr *
Parser::ParsedTypeAttributeList::applyAttributesToType(Parser &p,
TypeRepr *ty) const {
// Apply those attributes that do apply.
if (!Attributes.empty()) {
ty = AttributedTypeRepr::create(p.Context, Attributes, ty);
}
// Apply 'inout', 'consuming', or 'borrowing' modifiers.
if (SpecifierLoc.isValid() && Specifier != ParamDecl::Specifier::Default) {
ty = new (p.Context) OwnershipTypeRepr(ty, Specifier, SpecifierLoc);
}
// Apply 'isolated'.
if (IsolatedLoc.isValid()) {
ty = new (p.Context) IsolatedTypeRepr(ty, IsolatedLoc);
}
if (ConstLoc.isValid()) {
ty = new (p.Context) CompileTimeConstTypeRepr(ty, ConstLoc);
}
if (ResultDependsOnLoc.isValid()) {
ty = new (p.Context) ResultDependsOnTypeRepr(ty, ResultDependsOnLoc);
}
if (TransferringLoc.isValid()) {
ty = new (p.Context) TransferringTypeRepr(ty, TransferringLoc);
}
if (!lifetimeDependenceSpecifiers.empty()) {
ty = LifetimeDependentReturnTypeRepr::create(p.Context, ty,
lifetimeDependenceSpecifiers);
}
return ty;
}
LayoutConstraint Parser::parseLayoutConstraint(Identifier LayoutConstraintID) {
LayoutConstraint layoutConstraint =
getLayoutConstraint(LayoutConstraintID, Context);
assert(layoutConstraint->isKnownLayout() &&
"Expected layout constraint definition");
if (!layoutConstraint->isTrivial())
return layoutConstraint;
SourceLoc LParenLoc;
if (!consumeIf(tok::l_paren, LParenLoc)) {
// It is a trivial without any size constraints.
return LayoutConstraint::getLayoutConstraint(LayoutConstraintKind::Trivial,
Context);
}
int size = 0;
int alignment = 0;
auto ParseTrivialLayoutConstraintBody = [&] () -> bool {
// Parse the size and alignment.
if (Tok.is(tok::integer_literal)) {
if (Tok.getText().getAsInteger(10, size)) {
diagnose(Tok.getLoc(), diag::layout_size_should_be_positive);
return true;
}
consumeToken();
if (consumeIf(tok::comma)) {
// parse alignment.
if (Tok.is(tok::integer_literal)) {
if (Tok.getText().getAsInteger(10, alignment)) {
diagnose(Tok.getLoc(), diag::layout_alignment_should_be_positive);
return true;
}
consumeToken();
} else {
diagnose(Tok.getLoc(), diag::layout_alignment_should_be_positive);
return true;
}
}
} else {
diagnose(Tok.getLoc(), diag::layout_size_should_be_positive);
return true;
}
return false;
};
if (ParseTrivialLayoutConstraintBody()) {
// There was an error during parsing.
skipUntil(tok::r_paren);
consumeIf(tok::r_paren);
return LayoutConstraint::getUnknownLayout();
}
if (!consumeIf(tok::r_paren)) {
// Expected a closing r_paren.
diagnose(Tok.getLoc(), diag::expected_rparen_layout_constraint);
consumeToken();
return LayoutConstraint::getUnknownLayout();
}
if (size < 0) {
diagnose(Tok.getLoc(), diag::layout_size_should_be_positive);
return LayoutConstraint::getUnknownLayout();
}
if (alignment < 0) {
diagnose(Tok.getLoc(), diag::layout_alignment_should_be_positive);
return LayoutConstraint::getUnknownLayout();
}
// Otherwise it is a trivial layout constraint with
// provided size and alignment.
return LayoutConstraint::getLayoutConstraint(layoutConstraint->getKind(), size,
alignment, Context);
}
/// parseTypeSimple
/// type-simple:
/// type-identifier
/// type-tuple
/// type-composition-deprecated
/// 'Any'
/// type-simple '.Type'
/// type-simple '.Protocol'
/// type-simple '?'
/// type-simple '!'
/// '~' type-simple
/// type-collection
/// type-array
/// '_'
/// 'Pack' '{' (type (',' type)*)? '}' (only in SIL files)a
ParserResult<TypeRepr> Parser::parseTypeSimple(
Diag<> MessageID, ParseTypeReason reason) {
ParserResult<TypeRepr> ty;
if (isParameterSpecifier()) {
// Type specifier should already be parsed before here. This only happens
// for construct like 'P1 & inout P2'.
diagnose(Tok.getLoc(), diag::attr_only_on_parameters, Tok.getRawText());
skipParameterSpecifier();
}
// Eat any '~' preceding the type.
SourceLoc tildeLoc;
if (Tok.isTilde()) {
tildeLoc = consumeToken();
}
switch (Tok.getKind()) {
case tok::kw_Self:
case tok::identifier:
// In SIL files (not just when parsing SIL types), accept the
// Pack{} syntax for spelling variadic type packs.
if (isInSILMode() && Tok.isContextualKeyword("Pack") &&
peekToken().is(tok::l_brace)) {
TokReceiver->registerTokenKindChange(Tok.getLoc(),
tok::contextual_keyword);
SourceLoc keywordLoc = consumeToken(tok::identifier);
SourceLoc lbLoc = consumeToken(tok::l_brace);
SourceLoc rbLoc;
SmallVector<TypeRepr *, 8> elements;
auto status = parseList(tok::r_brace, lbLoc, rbLoc,
/*AllowSepAfterLast=*/false,
diag::expected_rbrace_pack_type_list,
[&] () -> ParserStatus {
auto element = parseType(diag::expected_type);
if (element.hasCodeCompletion())
return makeParserCodeCompletionStatus();
if (element.isNull())
return makeParserError();
elements.push_back(element.get());
return makeParserSuccess();
});
ty = makeParserResult(
status, PackTypeRepr::create(Context, keywordLoc,
SourceRange(lbLoc, rbLoc), elements));
} else {
ty = parseTypeIdentifier(/*Base=*/nullptr);
if (auto *repr = ty.getPtrOrNull()) {
if (Tok.is(tok::code_complete) && !Tok.isAtStartOfLine()) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleWithoutDot(repr);
}
ty.setHasCodeCompletionAndIsError();
consumeToken(tok::code_complete);
return ty;
}
}
}
break;
case tok::kw_Any:
ty = parseAnyType();
break;
case tok::l_paren:
ty = parseTypeTupleBody();
break;
case tok::code_complete:
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleBeginning();
}
return makeParserCodeCompletionResult<TypeRepr>(
ErrorTypeRepr::create(Context, consumeToken(tok::code_complete)));
case tok::l_square: {
ty = parseTypeCollection();
break;
}
case tok::kw__:
ty = makeParserResult(new (Context) PlaceholderTypeRepr(consumeToken()));
break;
case tok::kw_protocol:
if (startsWithLess(peekToken())) {
ty = parseOldStyleProtocolComposition();
break;
}
LLVM_FALLTHROUGH;
default:
{
auto diag = diagnose(Tok, MessageID);
// If the next token is closing or separating, the type was likely forgotten
if (Tok.isAny(tok::r_paren, tok::r_brace, tok::r_square, tok::arrow,
tok::equal, tok::comma, tok::semi))
diag.fixItInsert(getEndOfPreviousLoc(), " <#type#>");
}
if (Tok.isKeyword() && !Tok.isAtStartOfLine()) {
ty = makeParserErrorResult(ErrorTypeRepr::create(Context, Tok.getLoc()));
consumeToken();
return ty;
}
checkForInputIncomplete();
return nullptr;
}
// '.X', '.Type', '.Protocol', '?', '!', '[]'.
while (ty.isNonNull()) {
if (Tok.isAny(tok::period, tok::period_prefix)) {
if (peekToken().is(tok::code_complete)) {
consumeToken();
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleWithDot(ty.get());
}
ty.setHasCodeCompletionAndIsError();
consumeToken(tok::code_complete);
break;
}
ty = parseTypeDotted(ty);
continue;
}
if (!Tok.isAtStartOfLine()) {
if (isOptionalToken(Tok)) {
ty = parseTypeOptional(ty);
continue;
}
if (isImplicitlyUnwrappedOptionalToken(Tok)) {
ty = parseTypeImplicitlyUnwrappedOptional(ty);
continue;
}
// Parse legacy array types for migration.
if (Tok.is(tok::l_square) && reason != ParseTypeReason::CustomAttribute) {
ty = parseTypeArray(ty);
continue;
}
}
if (Tok.is(tok::code_complete) && !Tok.isAtStartOfLine()) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleWithoutDot(ty.get());
}
ty.setHasCodeCompletionAndIsError();
consumeToken(tok::code_complete);
}
break;
}
// Wrap in an InverseTypeRepr if needed.
if (tildeLoc) {
TypeRepr *repr = new (Context) InverseTypeRepr(tildeLoc, ty.get());
ty = makeParserResult(ty, repr);
}
return ty;
}
ParserResult<TypeRepr> Parser::parseType() {
return parseType(diag::expected_type);
}
ParserResult<TypeRepr> Parser::parseSILBoxType(GenericParamList *generics,
ParsedTypeAttributeList &attrs) {
auto LBraceLoc = consumeToken(tok::l_brace);
SmallVector<SILBoxTypeRepr::Field, 4> Fields;
if (!Tok.is(tok::r_brace)) {
for (;;) {
bool Mutable;
if (Tok.is(tok::kw_var)) {
Mutable = true;
} else if (Tok.is(tok::kw_let)) {
Mutable = false;
} else {
diagnose(Tok, diag::sil_box_expected_var_or_let);
return makeParserError();
}
SourceLoc VarOrLetLoc = consumeToken();
auto fieldTy = parseType();
if (!fieldTy.getPtrOrNull())
return makeParserError();
Fields.push_back({VarOrLetLoc, Mutable, fieldTy.get()});
if (!consumeIf(tok::comma))
break;
}
}
if (!Tok.is(tok::r_brace)) {
diagnose(Tok, diag::sil_box_expected_r_brace);
return makeParserError();
}
auto RBraceLoc = consumeToken(tok::r_brace);
SourceLoc LAngleLoc, RAngleLoc;
SmallVector<TypeRepr*, 4> Args;
if (startsWithLess(Tok)) {
LAngleLoc = consumeStartingLess();
for (;;) {
auto argTy = parseType();
if (!argTy.getPtrOrNull())
return makeParserError();
Args.push_back(argTy.get());
if (!consumeIf(tok::comma))
break;
}
if (!startsWithGreater(Tok)) {
diagnose(Tok, diag::sil_box_expected_r_angle);
return makeParserError();
}
RAngleLoc = consumeStartingGreater();
}
auto repr = SILBoxTypeRepr::create(Context, generics,
LBraceLoc, Fields, RBraceLoc,
LAngleLoc, Args, RAngleLoc);
attrs.Specifier = ParamDecl::Specifier::LegacyOwned;
return makeParserResult(attrs.applyAttributesToType(*this, repr));
}
/// parseTypeScalar
/// type-scalar:
/// attribute-list type-composition
/// attribute-list type-function
///
/// type-function:
/// type-composition 'async'? 'throws'? '->' type-scalar
///
ParserResult<TypeRepr> Parser::parseTypeScalar(
Diag<> MessageID, ParseTypeReason reason) {
// Start a context for creating type syntax.
ParserStatus status;
// Parse attributes.
ParsedTypeAttributeList parsedAttributeList;
status |= parsedAttributeList.parse(*this);
// Parse generic parameters in SIL mode.
GenericParamList *generics = nullptr;
SourceLoc substitutedLoc;
GenericParamList *patternGenerics = nullptr;
if (isInSILMode()) {
generics = maybeParseGenericParams().getPtrOrNull();
if (Tok.is(tok::at_sign) && peekToken().getText() == "substituted") {
consumeToken(tok::at_sign);
substitutedLoc = consumeToken(tok::identifier);
patternGenerics = maybeParseGenericParams().getPtrOrNull();
if (!patternGenerics) {
diagnose(Tok.getLoc(), diag::sil_function_subst_expected_generics);
}
}
}
// In SIL mode, parse box types { ... }.
if (isInSILMode() && Tok.is(tok::l_brace)) {
if (patternGenerics) {
diagnose(Tok.getLoc(), diag::sil_function_subst_expected_function);
}
return parseSILBoxType(generics, parsedAttributeList);
}
ParserResult<TypeRepr> ty = parseTypeSimpleOrComposition(MessageID, reason);
status |= ParserStatus(ty);
if (ty.isNull())
return status;
auto tyR = ty.get();
// Parse effects specifiers.
// Don't consume them, if there's no following '->', so we can emit a more
// useful diagnostic when parsing a function decl.
SourceLoc asyncLoc;
SourceLoc throwsLoc;
TypeRepr *thrownTy = nullptr;
if (isAtFunctionTypeArrow()) {
status |= parseEffectsSpecifiers(SourceLoc(),
asyncLoc, /*reasync=*/nullptr,
throwsLoc, /*rethrows=*/nullptr,
thrownTy);
}
// Handle type-function if we have an arrow.
if (Tok.is(tok::arrow)) {
SourceLoc arrowLoc = consumeToken();
// Handle async/throws in the wrong place.
parseEffectsSpecifiers(arrowLoc,
asyncLoc, /*reasync=*/nullptr,
throwsLoc, /*rethrows=*/nullptr,
thrownTy);
ParserResult<TypeRepr> SecondHalf =
parseTypeScalar(diag::expected_type_function_result,
ParseTypeReason::Unspecified);
status |= SecondHalf;
if (SecondHalf.isNull()) {
status.setIsParseError();
return status;
}
TupleTypeRepr *argsTyR = nullptr;
if (auto *TTArgs = dyn_cast<TupleTypeRepr>(tyR)) {
argsTyR = TTArgs;
} else if (tyR->isSimpleUnqualifiedIdentifier(Context.Id_Void)) {
diagnose(tyR->getStartLoc(), diag::function_type_no_parens)
.fixItReplace(tyR->getStartLoc(), "()");
argsTyR = TupleTypeRepr::createEmpty(Context, tyR->getSourceRange());
} else {
diagnose(tyR->getStartLoc(), diag::function_type_no_parens)
.highlight(tyR->getSourceRange())
.fixItInsert(tyR->getStartLoc(), "(")
.fixItInsertAfter(tyR->getEndLoc(), ")");
argsTyR = TupleTypeRepr::create(Context, {tyR}, tyR->getSourceRange());
}
// Parse substitutions for substituted SIL types.
MutableArrayRef<TypeRepr *> invocationSubsTypes;
MutableArrayRef<TypeRepr *> patternSubsTypes;
if (isInSILMode()) {
auto parseSubstitutions =
[&](MutableArrayRef<TypeRepr *> &subs) -> std::optional<bool> {
if (!consumeIf(tok::kw_for))
return std::nullopt;
if (!startsWithLess(Tok)) {
diagnose(Tok, diag::sil_function_subst_expected_l_angle);
return false;
}
consumeStartingLess();
SmallVector<TypeRepr*, 4> SubsTypesVec;
for (;;) {
auto argTy = parseType();
if (!argTy.getPtrOrNull())
return false;
SubsTypesVec.push_back(argTy.get());
if (!consumeIf(tok::comma))
break;
}
if (!startsWithGreater(Tok)) {
diagnose(Tok, diag::sil_function_subst_expected_r_angle);
return false;
}
consumeStartingGreater();
subs = Context.AllocateCopy(SubsTypesVec);
return true;
};
// Parse pattern substitutions. These must exist if we had pattern
// generics above.
if (patternGenerics) {
auto result = parseSubstitutions(patternSubsTypes);
if (!result || patternSubsTypes.empty()) {
diagnose(Tok, diag::sil_function_subst_expected_subs);
patternGenerics = nullptr;
} else if (!*result) {
return makeParserError();
}
}
if (generics) {
if (auto result = parseSubstitutions(invocationSubsTypes))
if (!*result) return makeParserError();
}
if (Tok.is(tok::kw_for)) {
diagnose(Tok, diag::sil_function_subs_without_generics);
return makeParserError();
}
}
tyR = new (Context) FunctionTypeRepr(generics, argsTyR, asyncLoc, throwsLoc,
thrownTy, arrowLoc, SecondHalf.get(),
patternGenerics, patternSubsTypes,
invocationSubsTypes);
} else if (auto firstGenerics = generics ? generics : patternGenerics) {
// Only function types may be generic.
auto brackets = firstGenerics->getSourceRange();
diagnose(brackets.Start, diag::generic_non_function);
// Forget any generic parameters we saw in the type.
class EraseTypeParamWalker : public ASTWalker {
public:
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::Arguments;
}
PreWalkAction walkToTypeReprPre(TypeRepr *T) override {
// Only unqualified identifiers can reference generic parameters.
auto *unqualIdentTR = dyn_cast<UnqualifiedIdentTypeRepr>(T);
if (unqualIdentTR && !unqualIdentTR->hasGenericArgList()) {
if (auto *genericParam = dyn_cast_or_null<GenericTypeParamDecl>(
unqualIdentTR->getBoundDecl())) {
unqualIdentTR->overwriteNameRef(genericParam->createNameRef());
}
}
return Action::Continue();
}
} walker;
if (tyR)
tyR->walk(walker);
}
return makeParserResult(
status, parsedAttributeList.applyAttributesToType(*this, tyR));
}
/// parseType
/// type:
/// type-scalar
/// pack-expansion-type
///
/// pack-expansion-type:
/// type-scalar '...'
///
/// \param fromASTGen If true , this function in called from ASTGen as the
/// fallback, so do not attempt a callback to ASTGen.
ParserResult<TypeRepr>
Parser::parseType(Diag<> MessageID, ParseTypeReason reason, bool fromASTGen) {
ParserResult<TypeRepr> ty;
#if SWIFT_BUILD_SWIFT_SYNTAX
if (IsForASTGen && !fromASTGen) {
ty = parseTypeReprFromSyntaxTree();
// Note: there is a representational difference between the swift-syntax
// tree and the C++ parser tree regarding variadic parameters. In the
// swift-syntax tree, the ellipsis is part of the parameter declaration.
// In the C++ parser tree, the ellipsis is part of the type. Account for
// this difference by consuming the ellipsis here.
goto AFTER_TY_PARSE;
}
#endif
// Parse pack expansion 'repeat T'
if (Tok.is(tok::kw_repeat)) {
SourceLoc repeatLoc = consumeToken(tok::kw_repeat);
auto ty = parseTypeScalar(MessageID, reason);
if (ty.isNull())
return ty;
return makeParserResult(ty,
new (Context) PackExpansionTypeRepr(repeatLoc, ty.get()));
} else if (Tok.is(tok::code_complete)) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeBeginning();
}
return makeParserCodeCompletionResult<TypeRepr>(
ErrorTypeRepr::create(Context, consumeToken(tok::code_complete)));
}
ty = parseTypeScalar(MessageID, reason);
AFTER_TY_PARSE:
if (ty.isNull())
return ty;
// Parse vararg type 'T...'.
if (Tok.isEllipsis()) {
Tok.setKind(tok::ellipsis);
SourceLoc ellipsisLoc = consumeToken();
ty = makeParserResult(ty,
new (Context) VarargTypeRepr(ty.get(), ellipsisLoc));
}
return ty;
}
ParserResult<TypeRepr> Parser::parseTypeWithOpaqueParams(Diag<> MessageID) {
GenericParamList *genericParams = nullptr;
if (Context.LangOpts.hasFeature(Feature::NamedOpaqueTypes)) {
auto result = maybeParseGenericParams();
genericParams = result.getPtrOrNull();
if (result.hasCodeCompletion())
return makeParserCodeCompletionStatus();
}
auto typeResult = parseType(MessageID);
if (auto type = typeResult.getPtrOrNull()) {
return makeParserResult(
ParserStatus(typeResult),
genericParams ? new (Context)
NamedOpaqueReturnTypeRepr(type, genericParams)
: type);
} else {
return typeResult;
}
}
ParserResult<TypeRepr> Parser::parseDeclResultType(Diag<> MessageID) {
auto codeCompleteResult = [&]() {
// Synthesize an ErrorTypeRepr here to ensure we extend the result type of
// a decl up to the code completion token, allowing the ASTScope to cover
// it.
return makeParserCodeCompletionResult(
ErrorTypeRepr::create(Context, getTypeErrorLoc()));
};
if (Tok.is(tok::code_complete)) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeDeclResultBeginning();
}
consumeToken(tok::code_complete);
return codeCompleteResult();
}
auto result = parseTypeWithOpaqueParams(MessageID);
if (result.hasCodeCompletion())
return codeCompleteResult();
if (!result.isParseErrorOrHasCompletion()) {
if (Tok.is(tok::r_square)) {
auto diag = diagnose(Tok, diag::extra_rbracket);
diag.fixItInsert(result.get()->getStartLoc(), getTokenText(tok::l_square));
consumeToken();
return makeParserErrorResult(ErrorTypeRepr::create(Context,
getTypeErrorLoc()));
}
if (Tok.is(tok::colon)) {
auto colonTok = consumeToken();
auto secondType = parseType(diag::expected_dictionary_value_type);
auto diag = diagnose(colonTok, diag::extra_colon);
diag.fixItInsert(result.get()->getStartLoc(), getTokenText(tok::l_square));
if (!secondType.isParseErrorOrHasCompletion()) {
if (Tok.is(tok::r_square)) {
consumeToken();
} else {
diag.fixItInsertAfter(secondType.get()->getEndLoc(), getTokenText(tok::r_square));
}
}
return makeParserErrorResult(ErrorTypeRepr::create(Context,
getTypeErrorLoc()));
}
}
return result;
}
SourceLoc Parser::getTypeErrorLoc() const {
// Use the same location as a missing close brace, etc.
return getErrorOrMissingLoc();
}
ParserStatus Parser::parseGenericArguments(SmallVectorImpl<TypeRepr *> &Args,
SourceLoc &LAngleLoc,
SourceLoc &RAngleLoc) {
// Parse the opening '<'.
assert(startsWithLess(Tok) && "Generic parameter list must start with '<'");
LAngleLoc = consumeStartingLess();
// Allow an empty generic parameter list, since this is meaningful with
// variadic generic types.
if (!startsWithGreater(Tok)) {
while (true) {
ParserResult<TypeRepr> Ty = parseType(diag::expected_type);
if (Ty.isNull() || Ty.hasCodeCompletion()) {
// Skip until we hit the '>'.
RAngleLoc = skipUntilGreaterInTypeList();
return ParserStatus(Ty);
}
Args.push_back(Ty.get());
// Parse the comma, if the list continues.
if (!consumeIf(tok::comma))
break;
}
}
if (!startsWithGreater(Tok)) {
checkForInputIncomplete();
diagnose(Tok, diag::expected_rangle_generic_arg_list);
diagnose(LAngleLoc, diag::opening_angle);
// Skip until we hit the '>'.
RAngleLoc = skipUntilGreaterInTypeList();
return makeParserError();
} else {
RAngleLoc = consumeStartingGreater();
}
return makeParserSuccess();
}
ParserResult<TypeRepr> Parser::parseQualifiedDeclNameBaseType() {
if (!canParseBaseTypeForQualifiedDeclName())
return makeParserError();
if (Tok.isNot(tok::identifier) && Tok.isNot(tok::kw_Self)) {
// is this the 'Any' type
if (Tok.is(tok::kw_Any)) {
return parseAnyType();
} else if (Tok.is(tok::code_complete)) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleBeginning();
}
// Eat the code completion token because we handled it.
consumeToken(tok::code_complete);
return makeParserCodeCompletionResult<DeclRefTypeRepr>();
}
diagnose(Tok, diag::expected_identifier_for_type);
// If there is a keyword at the start of a new line, we won't want to
// skip it as a recovery but rather keep it.
if (Tok.isKeyword() && !Tok.isAtStartOfLine())
consumeToken();
return nullptr;
}
ParserStatus Status;
DeclRefTypeRepr *Result = nullptr;
SourceLoc EndLoc;
while (true) {
auto PartialResult = parseTypeIdentifier(/*Base=*/Result);
if (PartialResult.isParseErrorOrHasCompletion())
return PartialResult;
Result = PartialResult.get();
// Treat 'Foo.<anything>' as an attempt to write a dotted type
// unless <anything> is 'Type'.
if ((Tok.is(tok::period) || Tok.is(tok::period_prefix))) {
if (peekToken().is(tok::code_complete)) {
Status.setHasCodeCompletionAndIsError();
break;
}
if (peekToken().isContextualKeyword("Type") ||
peekToken().isContextualKeyword("Protocol"))
break;
// Break before parsing the period before the final declaration
// name component.
{
// If qualified name base type cannot be parsed from the current
// point (i.e. the next type identifier is not followed by a '.'),
// then the next identifier is the final declaration name component.
BacktrackingScope backtrack(*this);
consumeStartingCharacterOfCurrentToken(tok::period);
if (!canParseBaseTypeForQualifiedDeclName())
break;
}
// Consume the period.
consumeToken();
continue;
}
if (Tok.is(tok::code_complete) && !Tok.isAtStartOfLine())
Status.setHasCodeCompletionAndIsError();
break;
}
if (Status.hasCodeCompletion()) {
if (Tok.isNot(tok::code_complete)) {
// We have a dot.
consumeToken();
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleWithDot(Result);
}
} else {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleWithoutDot(Result);
}
}
// Eat the code completion token because we handled it.
consumeToken(tok::code_complete);
}
return makeParserResult(Status, Result);
}
ParserResult<DeclRefTypeRepr> Parser::parseTypeIdentifier(TypeRepr *Base) {
// FIXME: We should parse e.g. 'X.var'. Almost any keyword is a valid member
// component.
DeclNameLoc Loc;
DeclNameRef Name =
parseDeclNameRef(Loc, diag::expected_identifier_in_dotted_type,
DeclNameFlag::AllowLowercaseAndUppercaseSelf);
if (!Name)
return makeParserError();
ParserStatus Status;
DeclRefTypeRepr *Result;
if (startsWithLess(Tok)) {
SourceLoc LAngle, RAngle;
SmallVector<TypeRepr *, 8> GenericArgs;
auto ArgsStatus = parseGenericArguments(GenericArgs, LAngle, RAngle);
if (ArgsStatus.isErrorOrHasCompletion())
return ArgsStatus;
Result = DeclRefTypeRepr::create(Context, Base, Loc, Name, GenericArgs,
SourceRange(LAngle, RAngle));
} else {
Result = DeclRefTypeRepr::create(Context, Base, Loc, Name);
}
return makeParserResult(Result);
}
ParserResult<TypeRepr> Parser::parseTypeDotted(ParserResult<TypeRepr> Base) {
assert(Base.isNonNull());
assert(Tok.isAny(tok::period, tok::period_prefix));
TypeRepr *Result = Base.get();
while (Tok.isAny(tok::period, tok::period_prefix)) {
if (peekToken().is(tok::code_complete)) {
// Code completion for "type-simple '.'" is handled in 'parseTypeSimple'.
break;
}
// Consume the period.
consumeToken();
if (Tok.isContextualKeyword("Type") ||
Tok.isContextualKeyword("Protocol")) {
if (Tok.getRawText() == "Type") {
Result = new (Context)
MetatypeTypeRepr(Result, consumeToken(tok::identifier));
} else {
Result = new (Context)
ProtocolTypeRepr(Result, consumeToken(tok::identifier));
}
continue;
}
auto PartialResult = parseTypeIdentifier(/*Base=*/Result);
if (PartialResult.isParseErrorOrHasCompletion())
return PartialResult | ParserStatus(Base);
Result = PartialResult.get();
}
return makeParserResult(Base, Result);
}
/// parseTypeSimpleOrComposition
///
/// type-composition:
/// 'some'? type-simple
/// 'any'? type-simple
/// type-composition '&' type-simple
ParserResult<TypeRepr>
Parser::parseTypeSimpleOrComposition(Diag<> MessageID, ParseTypeReason reason) {
// Check for the contextual keyword modifiers on types.
// These are only semantically allowed in certain contexts, but we parse it
// generally for diagnostics and recovery.
SourceLoc opaqueLoc;
SourceLoc anyLoc;
if (Tok.isContextualKeyword("some")) {
// Treat some as a keyword.
TokReceiver->registerTokenKindChange(Tok.getLoc(), tok::contextual_keyword);
opaqueLoc = consumeToken();
} else if (Tok.isContextualKeyword("any")) {
// Treat any as a keyword.
TokReceiver->registerTokenKindChange(Tok.getLoc(), tok::contextual_keyword);
anyLoc = consumeToken();
} else if (Tok.isContextualKeyword("each")) {
// Treat 'each' as a keyword.
TokReceiver->registerTokenKindChange(Tok.getLoc(), tok::contextual_keyword);
SourceLoc eachLoc = consumeToken();
ParserResult<TypeRepr> packElt = parseTypeSimple(MessageID, reason);
if (packElt.isNull())
return packElt;
auto *typeRepr = new (Context) PackElementTypeRepr(eachLoc, packElt.get());
return makeParserResult(ParserStatus(packElt), typeRepr);
} else if (Tok.is(tok::code_complete)) {
if (CodeCompletionCallbacks) {
CodeCompletionCallbacks->completeTypeSimpleOrComposition();
}
return makeParserCodeCompletionResult<TypeRepr>(
ErrorTypeRepr::create(Context, consumeToken(tok::code_complete)));
}
auto applyOpaque = [&](TypeRepr *type) -> TypeRepr * {
if (opaqueLoc.isValid() &&
(anyLoc.isInvalid() || SourceMgr.isBeforeInBuffer(opaqueLoc, anyLoc))) {
type = new (Context) OpaqueReturnTypeRepr(opaqueLoc, type);
} else if (anyLoc.isValid()) {
type = new (Context) ExistentialTypeRepr(anyLoc, type);
}
return type;
};
// Parse the first type
ParserResult<TypeRepr> FirstType = parseTypeSimple(MessageID, reason);
if (FirstType.isNull())
return FirstType;
if (!Tok.isContextualPunctuator("&")) {
return makeParserResult(ParserStatus(FirstType),
applyOpaque(FirstType.get()));
}
SmallVector<TypeRepr *, 4> Types;
ParserStatus Status(FirstType);
SourceLoc FirstTypeLoc = FirstType.get()->getStartLoc();
SourceLoc FirstAmpersandLoc = Tok.getLoc();
auto addType = [&](TypeRepr *T) {
if (!T) return;
if (auto Comp = dyn_cast<CompositionTypeRepr>(T)) {
// Accept protocol<P1, P2> & P3; explode it.
auto TyRs = Comp->getTypes();
if (!TyRs.empty()) // If empty, is 'Any'; ignore.
Types.append(TyRs.begin(), TyRs.end());
return;
}
Types.push_back(T);
};
addType(FirstType.get());
assert(Tok.isContextualPunctuator("&"));
do {
consumeToken(); // consume '&'
// Diagnose invalid `some` or `any` after an ampersand.
if (Tok.isContextualKeyword("some") ||
Tok.isContextualKeyword("any")) {
auto keyword = Tok.getText();
auto badLoc = consumeToken();
// Suggest moving `some` or `any` in front of the first type unless
// the first type is an opaque or existential type.
if (opaqueLoc.isValid() || anyLoc.isValid()) {
diagnose(badLoc, diag::opaque_mid_composition, keyword)
.fixItRemove(badLoc);
} else {