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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/Parse/Parser.h"
#include "swift/AST/Attr.h"
#include "swift/AST/TypeLoc.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/CodeCompletionCallbacks.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::applyAttributeToType(TypeRepr *ty,
SourceLoc InOutLoc,
const TypeAttributes &attrs) {
// Apply those attributes that do apply.
if (!attrs.empty())
ty = new (Context) AttributedTypeRepr(attrs, ty);
// Apply 'inout'
if (InOutLoc.isValid()) {
if (auto *fnTR = dyn_cast<FunctionTypeRepr>(ty)) {
// If the input to the function isn't parenthesized, apply the inout
// to the first (only) parameter, as we would in Swift 2. (This
// syntax is deprecated in Swift 3.)
TypeRepr *argsTR = fnTR->getArgsTypeRepr();
if (!isa<TupleTypeRepr>(argsTR)) {
auto *newArgsTR =
new (Context) InOutTypeRepr(argsTR, InOutLoc);
auto *newTR =
new (Context) FunctionTypeRepr(fnTR->getGenericParams(),
newArgsTR,
fnTR->getThrowsLoc(),
fnTR->getArrowLoc(),
fnTR->getResultTypeRepr());
newTR->setGenericEnvironment(fnTR->getGenericEnvironment());
return newTR;
}
}
ty = new (Context) InOutTypeRepr(ty, InOutLoc);
}
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(Context);
}
if (!consumeIf(tok::r_paren)) {
// Expected a closing r_paren.
diagnose(Tok.getLoc(), diag::expected_rparen_layout_constraint);
consumeToken();
return LayoutConstraint::getUnknownLayout(Context);
}
if (size < 0) {
diagnose(Tok.getLoc(), diag::layout_size_should_be_positive);
return LayoutConstraint::getUnknownLayout(Context);
}
if (alignment < 0) {
diagnose(Tok.getLoc(), diag::layout_alignment_should_be_positive);
return LayoutConstraint::getUnknownLayout(Context);
}
// Otherwise it is a trivial layout constraint with
// provided size and alignment.
return LayoutConstraint::getLayoutConstraint(layoutConstraint->getKind(), size,
alignment, Context);
}
ParserResult<TypeRepr> Parser::parseTypeSimple() {
return parseTypeSimple(diag::expected_type);
}
/// parseTypeSimple
/// type-simple:
/// type-identifier
/// type-tuple
/// type-composition-deprecated
/// 'Any'
/// type-simple '.Type'
/// type-simple '.Protocol'
/// type-simple '?'
/// type-simple '!'
/// type-collection
/// type-array
ParserResult<TypeRepr> Parser::parseTypeSimple(Diag<> MessageID,
bool HandleCodeCompletion) {
ParserResult<TypeRepr> ty;
// If this is an "inout" marker for an identifier type, consume the inout.
SourceLoc InOutLoc;
consumeIf(tok::kw_inout, InOutLoc);
switch (Tok.getKind()) {
case tok::kw_Self:
case tok::kw_Any:
case tok::identifier:
ty = parseTypeIdentifier();
break;
case tok::l_paren:
ty = parseTypeTupleBody();
break;
case tok::code_complete:
if (!HandleCodeCompletion)
break;
if (CodeCompletion)
CodeCompletion->completeTypeSimpleBeginning();
// Eat the code completion token because we handled it.
consumeToken(tok::code_complete);
return makeParserCodeCompletionResult<TypeRepr>();
case tok::kw_super:
case tok::kw_self:
// These keywords don't start a decl or a statement, and thus should be
// safe to skip over.
diagnose(Tok, MessageID);
ty = makeParserErrorResult(new (Context) ErrorTypeRepr(Tok.getLoc()));
consumeToken();
// FIXME: we could try to continue to parse.
return ty;
case tok::l_square:
ty = parseTypeCollection();
break;
case tok::kw_protocol:
if (startsWithLess(peekToken())) {
ty = parseOldStyleProtocolComposition();
break;
}
LLVM_FALLTHROUGH;
default:
diagnose(Tok, MessageID);
if (Tok.isKeyword() && !Tok.isAtStartOfLine()) {
ty = makeParserErrorResult(new (Context) ErrorTypeRepr(Tok.getLoc()));
consumeToken();
return ty;
}
checkForInputIncomplete();
return nullptr;
}
// '.Type', '.Protocol', '?', '!', and '[]' still leave us with type-simple.
while (ty.isNonNull()) {
if ((Tok.is(tok::period) || Tok.is(tok::period_prefix))) {
if (peekToken().isContextualKeyword("Type")) {
consumeToken();
SourceLoc metatypeLoc = consumeToken(tok::identifier);
ty = makeParserResult(ty,
new (Context) MetatypeTypeRepr(ty.get(), metatypeLoc));
continue;
}
if (peekToken().isContextualKeyword("Protocol")) {
consumeToken();
SourceLoc protocolLoc = consumeToken(tok::identifier);
ty = makeParserResult(ty,
new (Context) ProtocolTypeRepr(ty.get(), protocolLoc));
continue;
}
}
if (!Tok.isAtStartOfLine()) {
if (isOptionalToken(Tok)) {
ty = parseTypeOptional(ty.get());
continue;
}
if (isImplicitlyUnwrappedOptionalToken(Tok)) {
ty = parseTypeImplicitlyUnwrappedOptional(ty.get());
continue;
}
// Parse legacy array types for migration.
if (Tok.is(tok::l_square)) {
ty = parseTypeArray(ty.get());
continue;
}
}
break;
}
// If we parsed an inout modifier, prepend it.
if (InOutLoc.isValid() && ty.isNonNull())
ty = makeParserResult(new (Context) InOutTypeRepr(ty.get(),
InOutLoc));
return ty;
}
ParserResult<TypeRepr> Parser::parseType() {
return parseType(diag::expected_type);
}
ParserResult<TypeRepr> Parser::parseSILBoxType(GenericParamList *generics,
const TypeAttributes &attrs,
Optional<Scope> &GenericsScope) {
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))
continue;
break;
}
}
if (!Tok.is(tok::r_brace)) {
diagnose(Tok, diag::sil_box_expected_r_brace);
return makeParserError();
}
auto RBraceLoc = consumeToken(tok::r_brace);
// The generic arguments are taken from the enclosing scope. Pop the
// box layout's scope now.
GenericsScope.reset();
SourceLoc LAngleLoc, RAngleLoc;
SmallVector<TypeRepr*, 4> Args;
if (Tok.isContextualPunctuator("<")) {
LAngleLoc = consumeToken();
for (;;) {
auto argTy = parseType();
if (!argTy.getPtrOrNull())
return makeParserError();
Args.push_back(argTy.get());
if (consumeIf(tok::comma))
continue;
break;
}
if (!Tok.isContextualPunctuator(">")) {
diagnose(Tok, diag::sil_box_expected_r_angle);
return makeParserError();
}
RAngleLoc = consumeToken();
}
auto repr = SILBoxTypeRepr::create(Context, generics,
LBraceLoc, Fields, RBraceLoc,
LAngleLoc, Args, RAngleLoc);
return makeParserResult(applyAttributeToType(repr, SourceLoc(), attrs));
}
/// parseType
/// type:
/// attribute-list type-composition
/// attribute-list type-function
///
/// type-function:
/// type-composition '->' type
/// type-composition 'throws' '->' type
///
ParserResult<TypeRepr> Parser::parseType(Diag<> MessageID,
bool HandleCodeCompletion,
bool IsSILFuncDecl) {
// Parse attributes.
SourceLoc inoutLoc;
TypeAttributes attrs;
parseTypeAttributeList(inoutLoc, attrs);
Optional<Scope> GenericsScope;
// Parse generic parameters in SIL mode.
GenericParamList *generics = nullptr;
if (isInSILMode()) {
// If this is part of a sil function decl, generic parameters are visible in
// the function body; otherwise, they are visible when parsing the type.
if (!IsSILFuncDecl)
GenericsScope.emplace(this, ScopeKind::Generics);
generics = maybeParseGenericParams().getPtrOrNull();
}
// In SIL mode, parse box types { ... }.
if (isInSILMode() && Tok.is(tok::l_brace)) {
return parseSILBoxType(generics, attrs, GenericsScope);
}
ParserResult<TypeRepr> ty =
parseTypeSimpleOrComposition(MessageID, HandleCodeCompletion);
if (ty.hasCodeCompletion())
return makeParserCodeCompletionResult<TypeRepr>();
if (ty.isNull())
return nullptr;
auto tyR = ty.get();
// Parse a throws specifier.
// Don't consume 'throws', if the next token is not '->', so we can emit a
// more useful diagnostic when parsing a function decl.
SourceLoc throwsLoc;
if (Tok.isAny(tok::kw_throws, tok::kw_rethrows, tok::kw_throw) &&
peekToken().is(tok::arrow)) {
if (Tok.isNot(tok::kw_throws)) {
// 'rethrows' is only allowed on function declarations for now.
// 'throw' is probably a typo for 'throws'.
Diag<> DiagID = Tok.is(tok::kw_rethrows) ?
diag::rethrowing_function_type : diag::throw_in_function_type;
diagnose(Tok.getLoc(), DiagID)
.fixItReplace(Tok.getLoc(), "throws");
}
throwsLoc = consumeToken();
}
if (Tok.is(tok::arrow)) {
// Handle type-function if we have an arrow.
SourceLoc arrowLoc = consumeToken();
ParserResult<TypeRepr> SecondHalf =
parseType(diag::expected_type_function_result);
if (SecondHalf.hasCodeCompletion())
return makeParserCodeCompletionResult<TypeRepr>();
if (SecondHalf.isNull())
return nullptr;
tyR = new (Context) FunctionTypeRepr(generics, tyR, throwsLoc, arrowLoc,
SecondHalf.get());
} else if (generics) {
// Only function types may be generic.
auto brackets = generics->getSourceRange();
diagnose(brackets.Start, diag::generic_non_function);
GenericsScope.reset();
// Forget any generic parameters we saw in the type.
class EraseTypeParamWalker : public ASTWalker {
public:
bool walkToTypeReprPre(TypeRepr *T) override {
if (auto ident = dyn_cast<ComponentIdentTypeRepr>(T)) {
if (auto decl = ident->getBoundDecl()) {
if (isa<GenericTypeParamDecl>(decl))
ident->overwriteIdentifier(decl->getName());
}
}
return true;
}
} walker;
if (tyR)
tyR->walk(walker);
}
return makeParserResult(applyAttributeToType(tyR, inoutLoc, attrs));
}
ParserResult<TypeRepr> Parser::parseTypeForInheritance(
Diag<> MessageID, Diag<TypeLoc> NonIdentifierTypeMessageID) {
ParserResult<TypeRepr> Ty = parseTypeSimpleOrComposition(MessageID);
if (Ty.hasCodeCompletion())
return makeParserCodeCompletionResult<TypeRepr>();
if (Ty.isParseError() || isa<ErrorTypeRepr>(Ty.get()))
return Ty;
if (isa<IdentTypeRepr>(Ty.get()))
return Ty;
if (auto Comp = dyn_cast<CompositionTypeRepr>(Ty.get())) {
bool hasNonIdent = false;
for (auto T : Comp->getTypes()) {
if (isa<IdentTypeRepr>(T))
continue;
hasNonIdent = true;
diagnose(T->getLoc(), NonIdentifierTypeMessageID, T)
.highlight(T->getSourceRange());
}
// IdentType only composition are allowed.
if (!hasNonIdent)
return Ty;
} else {
diagnose(Ty.get()->getLoc(), NonIdentifierTypeMessageID, Ty.get())
.highlight(Ty.get()->getSourceRange());
}
return makeParserErrorResult(
new (Context) ErrorTypeRepr(Ty.get()->getSourceRange()));
return Ty;
}
bool Parser::parseGenericArguments(SmallVectorImpl<TypeRepr*> &Args,
SourceLoc &LAngleLoc,
SourceLoc &RAngleLoc) {
// Parse the opening '<'.
assert(startsWithLess(Tok) && "Generic parameter list must start with '<'");
LAngleLoc = consumeStartingLess();
do {
ParserResult<TypeRepr> Ty = parseType(diag::expected_type);
if (Ty.isNull() || Ty.hasCodeCompletion()) {
// Skip until we hit the '>'.
RAngleLoc = skipUntilGreaterInTypeList();
return true;
}
Args.push_back(Ty.get());
// Parse the comma, if the list continues.
} while (consumeIf(tok::comma));
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 true;
} else {
RAngleLoc = consumeStartingGreater();
}
return false;
}
/// parseTypeIdentifier
///
/// type-identifier:
/// identifier generic-args? ('.' identifier generic-args?)*
///
ParserResult<TypeRepr> Parser::parseTypeIdentifier() {
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 (CodeCompletion)
CodeCompletion->completeTypeSimpleBeginning();
// Eat the code completion token because we handled it.
consumeToken(tok::code_complete);
return makeParserCodeCompletionResult<IdentTypeRepr>();
}
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;
SmallVector<ComponentIdentTypeRepr *, 4> ComponentsR;
SourceLoc EndLoc;
while (true) {
SourceLoc Loc;
Identifier Name;
if (Tok.is(tok::kw_Self)) {
Loc = consumeIdentifier(&Name);
} else {
// FIXME: specialize diagnostic for 'Type': type cannot start with
// 'metatype'
// FIXME: offer a fixit: 'self' -> 'Self'
if (parseIdentifier(Name, Loc, diag::expected_identifier_in_dotted_type))
Status.setIsParseError();
}
if (Loc.isValid()) {
SourceLoc LAngle, RAngle;
SmallVector<TypeRepr*, 8> GenericArgs;
if (startsWithLess(Tok)) {
if (parseGenericArguments(GenericArgs, LAngle, RAngle))
return nullptr;
}
EndLoc = Loc;
ComponentIdentTypeRepr *CompT;
if (!GenericArgs.empty())
CompT = new (Context) GenericIdentTypeRepr(Loc, Name,
Context.AllocateCopy(GenericArgs),
SourceRange(LAngle, RAngle));
else
CompT = new (Context) SimpleIdentTypeRepr(Loc, Name);
ComponentsR.push_back(CompT);
}
// 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.setHasCodeCompletion();
break;
}
if (!peekToken().isContextualKeyword("Type")
&& !peekToken().isContextualKeyword("Protocol")) {
consumeToken();
continue;
}
} else if (Tok.is(tok::code_complete)) {
if (!Tok.isAtStartOfLine())
Status.setHasCodeCompletion();
break;
}
break;
}
IdentTypeRepr *ITR = nullptr;
if (!ComponentsR.empty()) {
// Lookup element #0 through our current scope chains in case it is some
// thing local (this returns null if nothing is found).
if (auto Entry = lookupInScope(ComponentsR[0]->getIdentifier()))
if (isa<TypeDecl>(Entry))
ComponentsR[0]->setValue(Entry);
ITR = IdentTypeRepr::create(Context, ComponentsR);
}
if (Status.hasCodeCompletion() && CodeCompletion) {
if (Tok.isNot(tok::code_complete)) {
// We have a dot.
consumeToken();
CodeCompletion->completeTypeIdentifierWithDot(ITR);
} else {
CodeCompletion->completeTypeIdentifierWithoutDot(ITR);
}
// Eat the code completion token because we handled it.
consumeToken(tok::code_complete);
}
return makeParserResult(Status, ITR);
}
ParserResult<TypeRepr> Parser::parseTypeSimpleOrComposition() {
return parseTypeSimpleOrComposition(diag::expected_identifier_for_type);
}
/// parseTypeSimpleOrComposition
///
/// type-composition:
/// type-simple
/// type-composition '&' type-simple
ParserResult<TypeRepr>
Parser::parseTypeSimpleOrComposition(Diag<> MessageID,
bool HandleCodeCompletion) {
// Parse the first type
ParserResult<TypeRepr> FirstType = parseTypeSimple(MessageID,
HandleCodeCompletion);
if (FirstType.hasCodeCompletion())
return makeParserCodeCompletionResult<TypeRepr>();
if (FirstType.isNull() || !Tok.isContextualPunctuator("&"))
return FirstType;
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());
while (Tok.isContextualPunctuator("&")) {
consumeToken(); // consume '&'
ParserResult<TypeRepr> ty =
parseTypeSimple(diag::expected_identifier_for_type, HandleCodeCompletion);
if (ty.hasCodeCompletion())
return makeParserCodeCompletionResult<TypeRepr>();
Status |= ty;
addType(ty.getPtrOrNull());
};
return makeParserResult(Status, CompositionTypeRepr::create(
Context, Types, FirstTypeLoc, {FirstAmpersandLoc, PreviousLoc}));
}
ParserResult<CompositionTypeRepr> Parser::parseAnyType() {
return makeParserResult(CompositionTypeRepr
::createEmptyComposition(Context, consumeToken(tok::kw_Any)));
}
/// parseOldStyleProtocolComposition
/// type-composition-deprecated:
/// 'protocol' '<' '>'
/// 'protocol' '<' type-composition-list-deprecated '>'
///
/// type-composition-list-deprecated:
/// type-identifier
/// type-composition-list-deprecated ',' type-identifier
ParserResult<TypeRepr> Parser::parseOldStyleProtocolComposition() {
assert(Tok.is(tok::kw_protocol) && startsWithLess(peekToken()));
SourceLoc ProtocolLoc = consumeToken();
SourceLoc LAngleLoc = consumeStartingLess();
// Parse the type-composition-list.
ParserStatus Status;
SmallVector<TypeRepr *, 4> Protocols;
bool IsEmpty = startsWithGreater(Tok);
if (!IsEmpty) {
do {
// Parse the type-identifier.
ParserResult<TypeRepr> Protocol = parseTypeIdentifier();
Status |= Protocol;
if (auto *ident =
dyn_cast_or_null<IdentTypeRepr>(Protocol.getPtrOrNull()))
Protocols.push_back(ident);
} while (consumeIf(tok::comma));
}
// Check for the terminating '>'.
SourceLoc RAngleLoc = PreviousLoc;
if (startsWithGreater(Tok)) {
RAngleLoc = consumeStartingGreater();
} else {
if (Status.isSuccess()) {
diagnose(Tok, diag::expected_rangle_protocol);
diagnose(LAngleLoc, diag::opening_angle);
Status.setIsParseError();
}
// Skip until we hit the '>'.
RAngleLoc = skipUntilGreaterInTypeList(/*protocolComposition=*/true);
}
auto composition = CompositionTypeRepr::create(
Context, Protocols, ProtocolLoc, {LAngleLoc, RAngleLoc});
if (Status.isSuccess()) {
// Only if we have complete protocol<...> construct, diagnose deprecated.
SmallString<32> replacement;
if (Protocols.empty()) {
replacement = "Any";
} else {
auto extractText = [&](TypeRepr *Ty) -> StringRef {
auto SourceRange = Ty->getSourceRange();
return SourceMgr.extractText(
Lexer::getCharSourceRangeFromSourceRange(SourceMgr, SourceRange));
};
auto Begin = Protocols.begin();
replacement += extractText(*Begin);
while (++Begin != Protocols.end()) {
replacement += " & ";
replacement += extractText(*Begin);
}
}
if (Protocols.size() > 1) {
// Need parenthesis if the next token looks like postfix TypeRepr.
// i.e. '?', '!', '.Type', '.Protocol'
bool needParen = false;
needParen |= !Tok.isAtStartOfLine() &&
(isOptionalToken(Tok) || isImplicitlyUnwrappedOptionalToken(Tok));
needParen |= Tok.isAny(tok::period, tok::period_prefix);
if (needParen) {
replacement.insert(replacement.begin(), '(');
replacement += ")";
}
}
// Copy split token after '>' to the replacement string.
// FIXME: lexer should smartly separate '>' and trailing contents like '?'.
StringRef TrailingContent = L->getTokenAt(RAngleLoc).getRange().str().
substr(1);
if (!TrailingContent.empty()) {
replacement += TrailingContent;
}
// Replace 'protocol<T1, T2>' with 'T1 & T2'
diagnose(ProtocolLoc,
IsEmpty ? diag::deprecated_any_composition :
Protocols.size() > 1 ? diag::deprecated_protocol_composition :
diag::deprecated_protocol_composition_single)
.highlight(composition->getSourceRange())
.fixItReplace(composition->getSourceRange(), replacement);
}
return makeParserResult(Status, composition);
}
/// parseTypeTupleBody
/// type-tuple:
/// '(' type-tuple-body? ')'
/// type-tuple-body:
/// type-tuple-element (',' type-tuple-element)* '...'?
/// type-tuple-element:
/// identifier ':' type
/// type
ParserResult<TupleTypeRepr> Parser::parseTypeTupleBody() {
Parser::StructureMarkerRAII ParsingTypeTuple(*this, Tok);
SourceLoc RPLoc, LPLoc = consumeToken(tok::l_paren);
SourceLoc EllipsisLoc;
unsigned EllipsisIdx;
SmallVector<TypeRepr *, 8> ElementsR;
// We keep track of the labels separately, and apply them at the end.
SmallVector<std::tuple<Identifier, SourceLoc, Identifier, SourceLoc>, 4>
Labels;
ParserStatus Status = parseList(tok::r_paren, LPLoc, RPLoc,
/*AllowSepAfterLast=*/false,
diag::expected_rparen_tuple_type_list,
[&] () -> ParserStatus {
TypeRepr *tyR;
// If this is a deprecated use of the inout marker in an argument list,
// consume the inout.
SourceLoc InOutLoc;
consumeIf(tok::kw_inout, InOutLoc);
// If the tuple element starts with a potential argument label followed by a
// ':' or another potential argument label, then the identifier is an
// element tag, and it is followed by a type annotation.
if (Tok.canBeArgumentLabel() &&
(peekToken().is(tok::colon) || peekToken().canBeArgumentLabel())) {
// Consume the name
Identifier name;
if (!Tok.is(tok::kw__))
name = Context.getIdentifier(Tok.getText());
SourceLoc nameLoc = consumeToken();
// If there is a second name, consume it as well.
Identifier secondName;
SourceLoc secondNameLoc;
if (Tok.canBeArgumentLabel()) {
if (!Tok.is(tok::kw__))
secondName = Context.getIdentifier(Tok.getText());
secondNameLoc = consumeToken();
}
// Consume the ':'.
if (!consumeIf(tok::colon))
diagnose(Tok, diag::expected_parameter_colon);
SourceLoc postColonLoc = Tok.getLoc();
// Parse the type annotation.
auto type = parseType(diag::expected_type);
if (type.hasCodeCompletion())
return makeParserCodeCompletionStatus();
if (type.isNull())
return makeParserError();
tyR = type.get();
// Complain obsoleted 'inout' position; (inout name: Ty)
if (InOutLoc.isValid() && !isa<InOutTypeRepr>(tyR))
diagnose(Tok.getLoc(), diag::inout_as_attr_disallowed)
.fixItRemove(InOutLoc)
.fixItInsert(postColonLoc, "inout ");
// Record the label. We will look at these at the end.
if (Labels.empty())
Labels.resize(ElementsR.size());
Labels.emplace_back(name, nameLoc, secondName, secondNameLoc);
} else {
// Otherwise, this has to be a type.
auto type = parseType();
if (type.hasCodeCompletion())
return makeParserCodeCompletionStatus();
if (type.isNull())
return makeParserError();
tyR = type.get();
if (!Labels.empty())
Labels.emplace_back();
}
// If an 'inout' marker was specified, build inout type.
// Note that we bury the inout locator within the named locator.
// This is weird but required by Sema apparently.
if (InOutLoc.isValid()) {
if (isa<InOutTypeRepr>(tyR))
diagnose(Tok, diag::parameter_inout_var_let_repeated)
.fixItRemove(InOutLoc);
else
tyR = new (Context) InOutTypeRepr(tyR, InOutLoc);
}
ElementsR.push_back(tyR);
// Parse '= expr' here so we can complain about it directly, rather
// than dying when we see it.
if (Tok.is(tok::equal)) {
SourceLoc equalLoc = consumeToken(tok::equal);
auto init = parseExpr(diag::expected_init_value);
auto inFlight = diagnose(equalLoc, diag::tuple_type_init);
if (init.isNonNull())
inFlight.fixItRemove(SourceRange(equalLoc, init.get()->getEndLoc()));
}
if (Tok.isEllipsis()) {
if (EllipsisLoc.isValid()) {
diagnose(Tok, diag::multiple_ellipsis_in_tuple)
.highlight(EllipsisLoc)
.fixItRemove(Tok.getLoc());
(void)consumeToken();
} else {
EllipsisLoc = consumeToken();
EllipsisIdx = ElementsR.size() - 1;
}
}
return makeParserSuccess();
});
if (EllipsisLoc.isValid() && ElementsR.empty()) {
EllipsisLoc = SourceLoc();
}
if (EllipsisLoc.isInvalid())
EllipsisIdx = ElementsR.size();
SmallVector<Identifier, 4> ElementNames;
SmallVector<SourceLoc, 4> ElementNameLocs;
SmallVector<SourceLoc, 4> UnderscoreLocs;
// If there were any labels, figure out which labels should go into the type
// representation.
if (!Labels.empty()) {
assert(Labels.size() == ElementsR.size());
bool isFunctionType = Tok.isAny(tok::arrow, tok::kw_throws,
tok::kw_rethrows);
ElementNames.resize(ElementsR.size());
ElementNameLocs.resize(ElementsR.size());
if (isFunctionType)
UnderscoreLocs.resize(ElementsR.size());
for (unsigned i : indices(ElementsR)) {
auto ¤tLabel = Labels[i];
Identifier firstName = std::get<0>(currentLabel);
SourceLoc firstNameLoc = std::get<1>(currentLabel);
Identifier secondName = std::get<2>(currentLabel);
SourceLoc secondNameLoc = std::get<3>(currentLabel);
// True tuples have labels.
if (!isFunctionType) {
// If there were two names, complain.
if (firstNameLoc.isValid() && secondNameLoc.isValid()) {
auto diag = diagnose(firstNameLoc, diag::tuple_type_multiple_labels);
if (firstName.empty()) {
diag.fixItRemoveChars(firstNameLoc, ElementsR[i]->getStartLoc());
} else {
diag.fixItRemove(
SourceRange(Lexer::getLocForEndOfToken(SourceMgr,firstNameLoc),
secondNameLoc));
}
}
// Form the named type representation.
ElementNames[i] = firstName;
ElementNameLocs[i] = firstNameLoc;
continue;
}
// If there was a first name, complain; arguments in function types are
// always unlabeled.
if (firstNameLoc.isValid() && !firstName.empty()) {
auto diag = diagnose(firstNameLoc, diag::function_type_argument_label,
firstName);
if (secondNameLoc.isInvalid())
diag.fixItInsert(firstNameLoc, "_ ");
else if (secondName.empty())
diag.fixItRemoveChars(firstNameLoc, ElementsR[i]->getStartLoc());
else
diag.fixItReplace(SourceRange(firstNameLoc), "_");
}
if (firstNameLoc.isValid() || secondNameLoc.isValid()) {
// Form the named parameter type representation.
ElementNames[i] = secondName;
ElementNameLocs[i] = secondNameLoc;
UnderscoreLocs[i] = firstNameLoc;
}
}
}
return makeParserResult(Status,
TupleTypeRepr::create(Context, ElementsR,
SourceRange(LPLoc, RPLoc),
ElementNames, ElementNameLocs,
UnderscoreLocs,
EllipsisLoc, EllipsisIdx));
}
/// parseTypeArray - Parse the type-array production, given that we
/// are looking at the initial l_square. Note that this index
/// clause is actually the outermost (first-indexed) clause.
///
/// type-array:
/// type-simple
/// type-array '[' ']'
/// type-array '[' expr ']'
///
ParserResult<TypeRepr> Parser::parseTypeArray(TypeRepr *Base) {
assert(Tok.isFollowingLSquare());
Parser::StructureMarkerRAII ParsingArrayBound(*this, Tok);
SourceLoc lsquareLoc = consumeToken();
ArrayTypeRepr *ATR = nullptr;
// Handle a postfix [] production, a common typo for a C-like array.
// If we have something that might be an array size expression, parse it as
// such, for better error recovery.
if (Tok.isNot(tok::r_square)) {
auto sizeEx = parseExprBasic(diag::expected_expr);
if (sizeEx.hasCodeCompletion())
return makeParserCodeCompletionStatus();
if (sizeEx.isNull())
return makeParserErrorResult(Base);
}
SourceLoc rsquareLoc;
if (parseMatchingToken(tok::r_square, rsquareLoc,
diag::expected_rbracket_array_type, lsquareLoc))
return makeParserErrorResult(Base);
// If we parsed something valid, diagnose it with a fixit to rewrite it to
// Swift syntax.