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CodeCompletion.cpp
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//===--- CodeCompletion.cpp - Code completion implementation --------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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
//
//===----------------------------------------------------------------------===//
#include "swift/IDE/CodeCompletion.h"
#include "CodeCompletionDiagnostics.h"
#include "CodeCompletionResultBuilder.h"
#include "ExprContextAnalysis.h"
#include "swift/AST/ASTPrinter.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Comment.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/ImportCache.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/ProtocolConformance.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/SubstitutionMap.h"
#include "swift/AST/USRGeneration.h"
#include "swift/Basic/Defer.h"
#include "swift/Basic/LLVM.h"
#include "swift/ClangImporter/ClangImporter.h"
#include "swift/ClangImporter/ClangModule.h"
#include "swift/Frontend/FrontendOptions.h"
#include "swift/IDE/ArgumentCompletion.h"
#include "swift/IDE/CodeCompletionCache.h"
#include "swift/IDE/CodeCompletionConsumer.h"
#include "swift/IDE/CodeCompletionResultPrinter.h"
#include "swift/IDE/CodeCompletionStringPrinter.h"
#include "swift/IDE/CompletionLookup.h"
#include "swift/IDE/CompletionOverrideLookup.h"
#include "swift/IDE/DotExprCompletion.h"
#include "swift/IDE/ExprCompletion.h"
#include "swift/IDE/KeyPathCompletion.h"
#include "swift/IDE/TypeCheckCompletionCallback.h"
#include "swift/IDE/UnresolvedMemberCompletion.h"
#include "swift/IDE/Utils.h"
#include "swift/Parse/CodeCompletionCallbacks.h"
#include "swift/Sema/IDETypeChecking.h"
#include "swift/Strings.h"
#include "swift/Subsystems.h"
#include "swift/Syntax/SyntaxKind.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Comment.h"
#include "clang/AST/CommentVisitor.h"
#include "clang/AST/Decl.h"
#include "clang/Basic/Module.h"
#include "clang/Index/USRGeneration.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/SaveAndRestore.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <string>
using namespace swift;
using namespace ide;
std::string swift::ide::removeCodeCompletionTokens(
StringRef Input, StringRef TokenName, unsigned *CompletionOffset) {
assert(TokenName.size() >= 1);
*CompletionOffset = ~0U;
std::string CleanFile;
CleanFile.reserve(Input.size());
const std::string Token = std::string("#^") + TokenName.str() + "^#";
for (const char *Ptr = Input.begin(), *End = Input.end();
Ptr != End; ++Ptr) {
const char C = *Ptr;
if (C == '#' && Ptr <= End - Token.size() &&
StringRef(Ptr, Token.size()) == Token) {
Ptr += Token.size() - 1;
*CompletionOffset = CleanFile.size();
CleanFile += '\0';
continue;
}
if (C == '#' && Ptr <= End - 2 && Ptr[1] == '^') {
do {
++Ptr;
} while (Ptr < End && *Ptr != '#');
if (Ptr == End)
break;
continue;
}
CleanFile += C;
}
return CleanFile;
}
namespace {
class CodeCompletionCallbacksImpl : public CodeCompletionCallbacks {
CodeCompletionContext &CompletionContext;
CodeCompletionConsumer &Consumer;
CodeCompletionExpr *CodeCompleteTokenExpr = nullptr;
CompletionKind Kind = CompletionKind::None;
Expr *ParsedExpr = nullptr;
SourceLoc DotLoc;
TypeLoc ParsedTypeLoc;
DeclContext *CurDeclContext = nullptr;
DeclAttrKind AttrKind;
/// In situations when \c SyntaxKind hints or determines
/// completions, i.e. a precedence group attribute, this
/// can be set and used to control the code completion scenario.
SyntaxKind SyntxKind;
int AttrParamIndex;
bool IsInSil = false;
bool HasSpace = false;
bool ShouldCompleteCallPatternAfterParen = true;
bool PreferFunctionReferencesToCalls = false;
bool AttTargetIsIndependent = false;
bool IsAtStartOfLine = false;
Optional<DeclKind> AttTargetDK;
Optional<StmtKind> ParentStmtKind;
SmallVector<StringRef, 3> ParsedKeywords;
SourceLoc introducerLoc;
std::vector<std::pair<std::string, bool>> SubModuleNameVisibilityPairs;
Optional<std::pair<Type, ConcreteDeclRef>> typeCheckParsedExpr() {
assert(ParsedExpr && "should have an expression");
// Figure out the kind of type-check we'll be performing.
auto CheckKind = CompletionTypeCheckKind::Normal;
if (Kind == CompletionKind::KeyPathExprObjC)
CheckKind = CompletionTypeCheckKind::KeyPath;
// If we've already successfully type-checked the expression for some
// reason, just return the type.
// FIXME: if it's ErrorType but we've already typechecked we shouldn't
// typecheck again. rdar://21466394
if (CheckKind == CompletionTypeCheckKind::Normal &&
ParsedExpr->getType() && !ParsedExpr->getType()->is<ErrorType>()) {
return getReferencedDecl(ParsedExpr);
}
ConcreteDeclRef ReferencedDecl = nullptr;
Expr *ModifiedExpr = ParsedExpr;
if (auto T = getTypeOfCompletionContextExpr(P.Context, CurDeclContext,
CheckKind, ModifiedExpr,
ReferencedDecl)) {
// FIXME: even though we don't apply the solution, the type checker may
// modify the original expression. We should understand what effect that
// may have on code completion.
ParsedExpr = ModifiedExpr;
return std::make_pair(*T, ReferencedDecl);
}
return None;
}
/// \returns true on success, false on failure.
bool typecheckParsedType() {
assert(ParsedTypeLoc.getTypeRepr() && "should have a TypeRepr");
if (ParsedTypeLoc.wasValidated() && !ParsedTypeLoc.isError()) {
return true;
}
const auto ty = swift::performTypeResolution(
ParsedTypeLoc.getTypeRepr(), P.Context,
/*isSILMode=*/false,
/*isSILType=*/false,
CurDeclContext->getGenericEnvironmentOfContext(),
/*GenericParams=*/nullptr,
CurDeclContext,
/*ProduceDiagnostics=*/false);
if (!ty->hasError()) {
ParsedTypeLoc.setType(CurDeclContext->mapTypeIntoContext(ty));
return true;
}
ParsedTypeLoc.setType(ty);
// It doesn't type check as a type, so see if it's a qualifying module name.
if (auto *ITR = dyn_cast<IdentTypeRepr>(ParsedTypeLoc.getTypeRepr())) {
const auto &componentRange = ITR->getComponentRange();
// If it has more than one component, it can't be a module name.
if (std::distance(componentRange.begin(), componentRange.end()) != 1)
return false;
const auto &component = componentRange.front();
ImportPath::Module::Builder builder(
component->getNameRef().getBaseIdentifier(),
component->getLoc());
if (auto Module = Context.getLoadedModule(builder.get()))
ParsedTypeLoc.setType(ModuleType::get(Module));
return true;
}
return false;
}
public:
CodeCompletionCallbacksImpl(Parser &P,
CodeCompletionContext &CompletionContext,
CodeCompletionConsumer &Consumer)
: CodeCompletionCallbacks(P), CompletionContext(CompletionContext),
Consumer(Consumer) {
}
void setAttrTargetDeclKind(Optional<DeclKind> DK) override {
if (DK == DeclKind::PatternBinding)
DK = DeclKind::Var;
else if (DK == DeclKind::Param)
// For params, consider the attribute is always for the decl.
AttTargetIsIndependent = false;
if (!AttTargetIsIndependent)
AttTargetDK = DK;
}
void completeDotExpr(CodeCompletionExpr *E, SourceLoc DotLoc) override;
void completeStmtOrExpr(CodeCompletionExpr *E) override;
void completePostfixExprBeginning(CodeCompletionExpr *E) override;
void completeForEachSequenceBeginning(CodeCompletionExpr *E) override;
void completePostfixExpr(Expr *E, bool hasSpace) override;
void completePostfixExprParen(Expr *E, Expr *CodeCompletionE) override;
void completeExprKeyPath(KeyPathExpr *KPE, SourceLoc DotLoc) override;
void completeTypeDeclResultBeginning() override;
void completeTypeSimpleBeginning() override;
void completeTypeIdentifierWithDot(IdentTypeRepr *ITR) override;
void completeTypeIdentifierWithoutDot(IdentTypeRepr *ITR) override;
void completeCaseStmtKeyword() override;
void completeCaseStmtBeginning(CodeCompletionExpr *E) override;
void completeDeclAttrBeginning(bool Sil, bool isIndependent) override;
void completeDeclAttrParam(DeclAttrKind DK, int Index) override;
void completeEffectsSpecifier(bool hasAsync, bool hasThrows) override;
void completeInPrecedenceGroup(SyntaxKind SK) override;
void completeNominalMemberBeginning(
SmallVectorImpl<StringRef> &Keywords, SourceLoc introducerLoc) override;
void completeAccessorBeginning(CodeCompletionExpr *E) override;
void completePoundAvailablePlatform() override;
void completeImportDecl(ImportPath::Builder &Path) override;
void completeUnresolvedMember(CodeCompletionExpr *E,
SourceLoc DotLoc) override;
void completeCallArg(CodeCompletionExpr *E, bool isFirst) override;
void completeLabeledTrailingClosure(CodeCompletionExpr *E,
bool isAtStartOfLine) override;
bool canPerformCompleteLabeledTrailingClosure() const override {
return true;
}
void completeReturnStmt(CodeCompletionExpr *E) override;
void completeYieldStmt(CodeCompletionExpr *E,
Optional<unsigned> yieldIndex) override;
void completeAfterPoundExpr(CodeCompletionExpr *E,
Optional<StmtKind> ParentKind) override;
void completeAfterPoundDirective() override;
void completePlatformCondition() override;
void completeGenericRequirement() override;
void completeAfterIfStmtElse() override;
void completeStmtLabel(StmtKind ParentKind) override;
void completeForEachPatternBeginning(bool hasTry, bool hasAwait) override;
void completeTypeAttrBeginning() override;
void doneParsing() override;
private:
void addKeywords(CodeCompletionResultSink &Sink, bool MaybeFuncBody);
bool trySolverCompletion(bool MaybeFuncBody);
};
} // end anonymous namespace
static void addSelectorModifierKeywords(CodeCompletionResultSink &sink) {
auto addKeyword = [&](StringRef Name, CodeCompletionKeywordKind Kind) {
CodeCompletionResultBuilder Builder(sink, CodeCompletionResultKind::Keyword,
SemanticContextKind::None);
Builder.setKeywordKind(Kind);
Builder.addTextChunk(Name);
Builder.addCallParameterColon();
Builder.addSimpleTypedParameter("@objc property", /*IsVarArg=*/false);
};
addKeyword("getter", CodeCompletionKeywordKind::None);
addKeyword("setter", CodeCompletionKeywordKind::None);
}
void CodeCompletionCallbacksImpl::completeDotExpr(CodeCompletionExpr *E,
SourceLoc DotLoc) {
assert(P.Tok.is(tok::code_complete));
// Don't produce any results in an enum element.
if (InEnumElementRawValue)
return;
Kind = CompletionKind::DotExpr;
if (ParseExprSelectorContext != ObjCSelectorContext::None) {
PreferFunctionReferencesToCalls = true;
CompleteExprSelectorContext = ParseExprSelectorContext;
}
ParsedExpr = E->getBase();
this->DotLoc = DotLoc;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completeStmtOrExpr(CodeCompletionExpr *E) {
assert(P.Tok.is(tok::code_complete));
Kind = CompletionKind::StmtOrExpr;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completePostfixExprBeginning(CodeCompletionExpr *E) {
assert(P.Tok.is(tok::code_complete));
// Don't produce any results in an enum element.
if (InEnumElementRawValue)
return;
Kind = CompletionKind::PostfixExprBeginning;
if (ParseExprSelectorContext != ObjCSelectorContext::None) {
PreferFunctionReferencesToCalls = true;
CompleteExprSelectorContext = ParseExprSelectorContext;
if (CompleteExprSelectorContext == ObjCSelectorContext::MethodSelector) {
addSelectorModifierKeywords(CompletionContext.getResultSink());
}
}
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completeForEachSequenceBeginning(
CodeCompletionExpr *E) {
assert(P.Tok.is(tok::code_complete));
Kind = CompletionKind::ForEachSequence;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completePostfixExpr(Expr *E, bool hasSpace) {
assert(P.Tok.is(tok::code_complete));
// Don't produce any results in an enum element.
if (InEnumElementRawValue)
return;
HasSpace = hasSpace;
Kind = CompletionKind::PostfixExpr;
if (ParseExprSelectorContext != ObjCSelectorContext::None) {
PreferFunctionReferencesToCalls = true;
CompleteExprSelectorContext = ParseExprSelectorContext;
}
ParsedExpr = E;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completePostfixExprParen(Expr *E,
Expr *CodeCompletionE) {
assert(P.Tok.is(tok::code_complete));
// Don't produce any results in an enum element.
if (InEnumElementRawValue)
return;
Kind = CompletionKind::PostfixExprParen;
ParsedExpr = E;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = static_cast<CodeCompletionExpr*>(CodeCompletionE);
ShouldCompleteCallPatternAfterParen = true;
if (CompletionContext.getCallPatternHeuristics()) {
// Lookahead one token to decide what kind of call completions to provide.
// When it appears that there is already code for the call present, just
// complete values and/or argument labels. Otherwise give the entire call
// pattern.
Token next = P.peekToken();
if (!next.isAtStartOfLine() && !next.is(tok::eof) && !next.is(tok::r_paren)) {
ShouldCompleteCallPatternAfterParen = false;
}
}
}
void CodeCompletionCallbacksImpl::completeExprKeyPath(KeyPathExpr *KPE,
SourceLoc DotLoc) {
Kind = (!KPE || KPE->isObjC()) ? CompletionKind::KeyPathExprObjC
: CompletionKind::KeyPathExprSwift;
ParsedExpr = KPE;
this->DotLoc = DotLoc;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completePoundAvailablePlatform() {
Kind = CompletionKind::PoundAvailablePlatform;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeTypeDeclResultBeginning() {
Kind = CompletionKind::TypeDeclResultBeginning;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeTypeSimpleBeginning() {
Kind = CompletionKind::TypeSimpleBeginning;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeDeclAttrParam(DeclAttrKind DK,
int Index) {
Kind = CompletionKind::AttributeDeclParen;
AttrKind = DK;
AttrParamIndex = Index;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeEffectsSpecifier(bool hasAsync,
bool hasThrows) {
Kind = CompletionKind::EffectsSpecifier;
CurDeclContext = P.CurDeclContext;
ParsedKeywords.clear();
if (hasAsync)
ParsedKeywords.emplace_back("async");
if (hasThrows)
ParsedKeywords.emplace_back("throws");
}
void CodeCompletionCallbacksImpl::completeDeclAttrBeginning(
bool Sil, bool isIndependent) {
Kind = CompletionKind::AttributeBegin;
IsInSil = Sil;
CurDeclContext = P.CurDeclContext;
AttTargetIsIndependent = isIndependent;
}
void CodeCompletionCallbacksImpl::completeInPrecedenceGroup(SyntaxKind SK) {
assert(P.Tok.is(tok::code_complete));
SyntxKind = SK;
Kind = CompletionKind::PrecedenceGroup;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeTypeIdentifierWithDot(
IdentTypeRepr *ITR) {
if (!ITR) {
completeTypeSimpleBeginning();
return;
}
Kind = CompletionKind::TypeIdentifierWithDot;
ParsedTypeLoc = TypeLoc(ITR);
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeTypeIdentifierWithoutDot(
IdentTypeRepr *ITR) {
assert(ITR);
Kind = CompletionKind::TypeIdentifierWithoutDot;
ParsedTypeLoc = TypeLoc(ITR);
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeCaseStmtKeyword() {
Kind = CompletionKind::CaseStmtKeyword;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeCaseStmtBeginning(CodeCompletionExpr *E) {
assert(!InEnumElementRawValue);
Kind = CompletionKind::CaseStmtBeginning;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completeImportDecl(
ImportPath::Builder &Path) {
Kind = CompletionKind::Import;
CurDeclContext = P.CurDeclContext;
DotLoc = Path.empty() ? SourceLoc() : Path.back().Loc;
if (DotLoc.isInvalid())
return;
auto Importer = static_cast<ClangImporter *>(CurDeclContext->getASTContext().
getClangModuleLoader());
std::vector<std::string> SubNames;
Importer->collectSubModuleNames(Path.get().getModulePath(false), SubNames);
ASTContext &Ctx = CurDeclContext->getASTContext();
Path.push_back(Identifier());
for (StringRef Sub : SubNames) {
Path.back().Item = Ctx.getIdentifier(Sub);
SubModuleNameVisibilityPairs.push_back(
std::make_pair(Sub.str(),
Ctx.getLoadedModule(Path.get().getModulePath(false))));
}
Path.pop_back();
}
void CodeCompletionCallbacksImpl::completeUnresolvedMember(CodeCompletionExpr *E,
SourceLoc DotLoc) {
Kind = CompletionKind::UnresolvedMember;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
this->DotLoc = DotLoc;
}
void CodeCompletionCallbacksImpl::completeCallArg(CodeCompletionExpr *E,
bool isFirst) {
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
Kind = CompletionKind::CallArg;
ShouldCompleteCallPatternAfterParen = false;
if (isFirst) {
ShouldCompleteCallPatternAfterParen = true;
if (CompletionContext.getCallPatternHeuristics()) {
// Lookahead one token to decide what kind of call completions to provide.
// When it appears that there is already code for the call present, just
// complete values and/or argument labels. Otherwise give the entire call
// pattern.
Token next = P.peekToken();
if (!next.isAtStartOfLine() && !next.is(tok::eof) && !next.is(tok::r_paren)) {
ShouldCompleteCallPatternAfterParen = false;
}
}
}
}
void CodeCompletionCallbacksImpl::completeLabeledTrailingClosure(
CodeCompletionExpr *E, bool isAtStartOfLine) {
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
Kind = CompletionKind::LabeledTrailingClosure;
IsAtStartOfLine = isAtStartOfLine;
}
void CodeCompletionCallbacksImpl::completeReturnStmt(CodeCompletionExpr *E) {
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
Kind = CompletionKind::ReturnStmtExpr;
}
void CodeCompletionCallbacksImpl::completeYieldStmt(CodeCompletionExpr *E,
Optional<unsigned> index) {
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
// TODO: use a different completion kind when completing without an index
// in a multiple-value context.
Kind = CompletionKind::YieldStmtExpr;
}
void CodeCompletionCallbacksImpl::completeAfterPoundExpr(
CodeCompletionExpr *E, Optional<StmtKind> ParentKind) {
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
Kind = CompletionKind::AfterPoundExpr;
ParentStmtKind = ParentKind;
}
void CodeCompletionCallbacksImpl::completeAfterPoundDirective() {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::AfterPoundDirective;
}
void CodeCompletionCallbacksImpl::completePlatformCondition() {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::PlatformConditon;
}
void CodeCompletionCallbacksImpl::completeAfterIfStmtElse() {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::AfterIfStmtElse;
}
void CodeCompletionCallbacksImpl::completeGenericRequirement() {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::GenericRequirement;
}
void CodeCompletionCallbacksImpl::completeNominalMemberBeginning(
SmallVectorImpl<StringRef> &Keywords, SourceLoc introducerLoc) {
assert(!InEnumElementRawValue);
this->introducerLoc = introducerLoc;
ParsedKeywords.clear();
ParsedKeywords.append(Keywords.begin(), Keywords.end());
Kind = CompletionKind::NominalMemberBeginning;
CurDeclContext = P.CurDeclContext;
}
void CodeCompletionCallbacksImpl::completeAccessorBeginning(
CodeCompletionExpr *E) {
Kind = CompletionKind::AccessorBeginning;
CurDeclContext = P.CurDeclContext;
CodeCompleteTokenExpr = E;
}
void CodeCompletionCallbacksImpl::completeStmtLabel(StmtKind ParentKind) {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::StmtLabel;
ParentStmtKind = ParentKind;
}
void CodeCompletionCallbacksImpl::completeForEachPatternBeginning(
bool hasTry, bool hasAwait) {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::ForEachPatternBeginning;
ParsedKeywords.clear();
if (hasTry)
ParsedKeywords.emplace_back("try");
if (hasAwait)
ParsedKeywords.emplace_back("await");
}
void CodeCompletionCallbacksImpl::completeTypeAttrBeginning() {
CurDeclContext = P.CurDeclContext;
Kind = CompletionKind::TypeAttrBeginning;
}
bool swift::ide::isDynamicLookup(Type T) {
return T->getRValueType()->isAnyObject();
}
static bool isClangSubModule(ModuleDecl *TheModule) {
if (auto ClangMod = TheModule->findUnderlyingClangModule())
return ClangMod->isSubModule();
return false;
}
static void addKeyword(CodeCompletionResultSink &Sink, StringRef Name,
CodeCompletionKeywordKind Kind,
StringRef TypeAnnotation = "",
CodeCompletionFlair Flair = {}) {
CodeCompletionResultBuilder Builder(Sink, CodeCompletionResultKind::Keyword,
SemanticContextKind::None);
Builder.setKeywordKind(Kind);
Builder.addKeyword(Name);
Builder.addFlair(Flair);
if (!TypeAnnotation.empty())
Builder.addTypeAnnotation(TypeAnnotation);
Builder.setResultTypeNotApplicable();
}
static void addDeclKeywords(CodeCompletionResultSink &Sink, DeclContext *DC,
bool IsConcurrencyEnabled) {
auto isTypeDeclIntroducer = [](CodeCompletionKeywordKind Kind,
Optional<DeclAttrKind> DAK) -> bool {
switch (Kind) {
case CodeCompletionKeywordKind::kw_protocol:
case CodeCompletionKeywordKind::kw_class:
case CodeCompletionKeywordKind::kw_struct:
case CodeCompletionKeywordKind::kw_enum:
case CodeCompletionKeywordKind::kw_extension:
return true;
case CodeCompletionKeywordKind::None:
if (DAK && *DAK == DeclAttrKind::DAK_Actor) {
return true;
}
break;
default:
break;
}
return false;
};
auto isTopLevelOnlyDeclIntroducer = [](CodeCompletionKeywordKind Kind,
Optional<DeclAttrKind> DAK) -> bool {
switch (Kind) {
case CodeCompletionKeywordKind::kw_operator:
case CodeCompletionKeywordKind::kw_precedencegroup:
case CodeCompletionKeywordKind::kw_import:
case CodeCompletionKeywordKind::kw_protocol:
case CodeCompletionKeywordKind::kw_extension:
return true;
default:
return false;
}
};
auto getFlair = [&](CodeCompletionKeywordKind Kind,
Optional<DeclAttrKind> DAK) -> CodeCompletionFlair {
if (isCodeCompletionAtTopLevelOfLibraryFile(DC)) {
// Type decls are common in library file top-level.
if (isTypeDeclIntroducer(Kind, DAK))
return CodeCompletionFlairBit::CommonKeywordAtCurrentPosition;
}
if (isa<ProtocolDecl>(DC)) {
// Protocols cannot have nested type decls (other than 'typealias').
if (isTypeDeclIntroducer(Kind, DAK))
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
}
if (DC->isTypeContext()) {
// Top-level only decls are invalid in type context.
if (isTopLevelOnlyDeclIntroducer(Kind, DAK))
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
}
if (isCompletionDeclContextLocalContext(DC)) {
// Local type decl are valid, but not common.
if (isTypeDeclIntroducer(Kind, DAK))
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
// Top-level only decls are invalid in function body.
if (isTopLevelOnlyDeclIntroducer(Kind, DAK))
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
// 'init', 'deinit' and 'subscript' are invalid in function body.
// Access control modifiers are invalid in function body.
switch (Kind) {
case CodeCompletionKeywordKind::kw_init:
case CodeCompletionKeywordKind::kw_deinit:
case CodeCompletionKeywordKind::kw_subscript:
case CodeCompletionKeywordKind::kw_private:
case CodeCompletionKeywordKind::kw_fileprivate:
case CodeCompletionKeywordKind::kw_internal:
case CodeCompletionKeywordKind::kw_public:
case CodeCompletionKeywordKind::kw_static:
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
default:
break;
}
// These modifiers are invalid for decls in function body.
if (DAK) {
switch (*DAK) {
case DeclAttrKind::DAK_Lazy:
case DeclAttrKind::DAK_Final:
case DeclAttrKind::DAK_Infix:
case DeclAttrKind::DAK_Frozen:
case DeclAttrKind::DAK_Prefix:
case DeclAttrKind::DAK_Postfix:
case DeclAttrKind::DAK_Dynamic:
case DeclAttrKind::DAK_Override:
case DeclAttrKind::DAK_Optional:
case DeclAttrKind::DAK_Required:
case DeclAttrKind::DAK_Convenience:
case DeclAttrKind::DAK_AccessControl:
case DeclAttrKind::DAK_Nonisolated:
return CodeCompletionFlairBit::RareKeywordAtCurrentPosition;
default:
break;
}
}
}
return None;
};
auto AddDeclKeyword = [&](StringRef Name, CodeCompletionKeywordKind Kind,
Optional<DeclAttrKind> DAK) {
if (Name == "let" || Name == "var") {
// Treat keywords that could be the start of a pattern specially.
return;
}
// FIXME: This should use canUseAttributeOnDecl.
// Remove user inaccessible keywords.
if (DAK.hasValue() && DeclAttribute::isUserInaccessible(*DAK))
return;
// Remove keywords only available when concurrency is enabled.
if (DAK.hasValue() && !IsConcurrencyEnabled &&
DeclAttribute::isConcurrencyOnly(*DAK))
return;
addKeyword(Sink, Name, Kind, /*TypeAnnotation=*/"", getFlair(Kind, DAK));
};
#define DECL_KEYWORD(kw) \
AddDeclKeyword(#kw, CodeCompletionKeywordKind::kw_##kw, None);
#include "swift/Syntax/TokenKinds.def"
// Context-sensitive keywords.
auto AddCSKeyword = [&](StringRef Name, DeclAttrKind Kind) {
AddDeclKeyword(Name, CodeCompletionKeywordKind::None, Kind);
};
#define CONTEXTUAL_CASE(KW, CLASS) AddCSKeyword(#KW, DAK_##CLASS);
#define CONTEXTUAL_DECL_ATTR(KW, CLASS, ...) CONTEXTUAL_CASE(KW, CLASS)
#define CONTEXTUAL_DECL_ATTR_ALIAS(KW, CLASS) CONTEXTUAL_CASE(KW, CLASS)
#define CONTEXTUAL_SIMPLE_DECL_ATTR(KW, CLASS, ...) CONTEXTUAL_CASE(KW, CLASS)
#include <swift/AST/Attr.def>
#undef CONTEXTUAL_CASE
}
static void addStmtKeywords(CodeCompletionResultSink &Sink, DeclContext *DC,
bool MaybeFuncBody) {
CodeCompletionFlair flair;
// Starting a statement at top-level in non-script files is invalid.
if (isCodeCompletionAtTopLevelOfLibraryFile(DC)) {
flair |= CodeCompletionFlairBit::ExpressionAtNonScriptOrMainFileScope;
}
auto AddStmtKeyword = [&](StringRef Name, CodeCompletionKeywordKind Kind) {
if (!MaybeFuncBody && Kind == CodeCompletionKeywordKind::kw_return)
return;
addKeyword(Sink, Name, Kind, "", flair);
};
#define STMT_KEYWORD(kw) AddStmtKeyword(#kw, CodeCompletionKeywordKind::kw_##kw);
#include "swift/Syntax/TokenKinds.def"
}
static void addCaseStmtKeywords(CodeCompletionResultSink &Sink) {
addKeyword(Sink, "case", CodeCompletionKeywordKind::kw_case);
addKeyword(Sink, "default", CodeCompletionKeywordKind::kw_default);
}
static void addLetVarKeywords(CodeCompletionResultSink &Sink) {
addKeyword(Sink, "let", CodeCompletionKeywordKind::kw_let);
addKeyword(Sink, "var", CodeCompletionKeywordKind::kw_var);
}
static void addAccessorKeywords(CodeCompletionResultSink &Sink) {
addKeyword(Sink, "get", CodeCompletionKeywordKind::None);
addKeyword(Sink, "set", CodeCompletionKeywordKind::None);
}
static void addObserverKeywords(CodeCompletionResultSink &Sink) {
addKeyword(Sink, "willSet", CodeCompletionKeywordKind::None);
addKeyword(Sink, "didSet", CodeCompletionKeywordKind::None);
}
void swift::ide::addExprKeywords(CodeCompletionResultSink &Sink,
DeclContext *DC) {
// Expression is invalid at top-level of non-script files.
CodeCompletionFlair flair;
if (isCodeCompletionAtTopLevelOfLibraryFile(DC)) {
flair |= CodeCompletionFlairBit::ExpressionAtNonScriptOrMainFileScope;
}
// Expr keywords.
addKeyword(Sink, "try", CodeCompletionKeywordKind::kw_try, "", flair);
addKeyword(Sink, "try!", CodeCompletionKeywordKind::kw_try, "", flair);
addKeyword(Sink, "try?", CodeCompletionKeywordKind::kw_try, "", flair);
addKeyword(Sink, "await", CodeCompletionKeywordKind::None, "", flair);
}
void swift::ide::addSuperKeyword(CodeCompletionResultSink &Sink,
DeclContext *DC) {
if (!DC)
return;
auto *TC = DC->getInnermostTypeContext();
if (!TC)
return;
auto *CD = TC->getSelfClassDecl();
if (!CD)
return;
Type ST = CD->getSuperclass();
if (ST.isNull() || ST->is<ErrorType>())
return;
CodeCompletionResultBuilder Builder(Sink, CodeCompletionResultKind::Keyword,
SemanticContextKind::CurrentNominal);
if (auto *AFD = dyn_cast<AbstractFunctionDecl>(DC)) {
if (AFD->getOverriddenDecl() != nullptr) {
Builder.addFlair(CodeCompletionFlairBit::CommonKeywordAtCurrentPosition);
}
}
Builder.setKeywordKind(CodeCompletionKeywordKind::kw_super);
Builder.addKeyword("super");
Builder.addTypeAnnotation(ST, PrintOptions());
}
static void addOpaqueTypeKeyword(CodeCompletionResultSink &Sink) {
addKeyword(Sink, "some", CodeCompletionKeywordKind::None, "some");
}
static void addAnyTypeKeyword(CodeCompletionResultSink &Sink, Type T) {
CodeCompletionResultBuilder Builder(Sink, CodeCompletionResultKind::Keyword,
SemanticContextKind::None);
Builder.setKeywordKind(CodeCompletionKeywordKind::None);
Builder.addKeyword("Any");
Builder.addTypeAnnotation(T, PrintOptions());
}
void CodeCompletionCallbacksImpl::addKeywords(CodeCompletionResultSink &Sink,
bool MaybeFuncBody) {
switch (Kind) {
case CompletionKind::None:
case CompletionKind::DotExpr:
case CompletionKind::AttributeDeclParen:
case CompletionKind::AttributeBegin:
case CompletionKind::PoundAvailablePlatform:
case CompletionKind::Import:
case CompletionKind::UnresolvedMember:
case CompletionKind::LabeledTrailingClosure:
case CompletionKind::AfterPoundExpr:
case CompletionKind::AfterPoundDirective:
case CompletionKind::PlatformConditon:
case CompletionKind::GenericRequirement:
case CompletionKind::KeyPathExprObjC:
case CompletionKind::KeyPathExprSwift:
case CompletionKind::PrecedenceGroup:
case CompletionKind::StmtLabel:
case CompletionKind::TypeAttrBeginning:
break;
case CompletionKind::EffectsSpecifier: {
if (!llvm::is_contained(ParsedKeywords, "async"))
addKeyword(Sink, "async", CodeCompletionKeywordKind::None);
if (!llvm::is_contained(ParsedKeywords, "throws"))
addKeyword(Sink, "throws", CodeCompletionKeywordKind::kw_throws);
break;
}
case CompletionKind::AccessorBeginning: {
// TODO: Omit already declared or mutally exclusive accessors.
// E.g. If 'get' is already declared, emit 'set' only.
addAccessorKeywords(Sink);
// Only 'var' for non-protocol context can have 'willSet' and 'didSet'.
assert(ParsedDecl);
VarDecl *var = dyn_cast<VarDecl>(ParsedDecl);
if (auto accessor = dyn_cast<AccessorDecl>(ParsedDecl))
var = dyn_cast<VarDecl>(accessor->getStorage());
if (var && !var->getDeclContext()->getSelfProtocolDecl())
addObserverKeywords(Sink);
if (!isa<AccessorDecl>(ParsedDecl))
break;
MaybeFuncBody = true;
LLVM_FALLTHROUGH;
}
case CompletionKind::StmtOrExpr:
addDeclKeywords(Sink, CurDeclContext,
Context.LangOpts.EnableExperimentalConcurrency);
addStmtKeywords(Sink, CurDeclContext, MaybeFuncBody);
LLVM_FALLTHROUGH;
case CompletionKind::ReturnStmtExpr:
case CompletionKind::YieldStmtExpr:
case CompletionKind::PostfixExprBeginning:
case CompletionKind::ForEachSequence:
addSuperKeyword(Sink, CurDeclContext);
addLetVarKeywords(Sink);
addExprKeywords(Sink, CurDeclContext);
addAnyTypeKeyword(Sink, CurDeclContext->getASTContext().TheAnyType);
break;
case CompletionKind::CallArg:
case CompletionKind::PostfixExprParen:
// Note that we don't add keywords here as the completion might be for
// an argument list pattern. We instead add keywords later in
// CodeCompletionCallbacksImpl::doneParsing when we know we're not
// completing for a argument list pattern.
break;
case CompletionKind::CaseStmtKeyword:
addCaseStmtKeywords(Sink);
break;
case CompletionKind::PostfixExpr:
case CompletionKind::CaseStmtBeginning:
case CompletionKind::TypeIdentifierWithDot:
case CompletionKind::TypeIdentifierWithoutDot:
break;
case CompletionKind::TypeDeclResultBeginning: {
auto DC = CurDeclContext;
if (ParsedDecl && ParsedDecl == CurDeclContext->getAsDecl())
DC = ParsedDecl->getDeclContext();
if (!isa<ProtocolDecl>(DC))
if (DC->isTypeContext() || isa_and_nonnull<FuncDecl>(ParsedDecl))
addOpaqueTypeKeyword(Sink);
LLVM_FALLTHROUGH;
}
case CompletionKind::TypeSimpleBeginning:
addAnyTypeKeyword(Sink, CurDeclContext->getASTContext().TheAnyType);
break;
case CompletionKind::NominalMemberBeginning: {
bool HasDeclIntroducer = llvm::find_if(ParsedKeywords,
[this](const StringRef kw) {
return llvm::StringSwitch<bool>(kw)
.Case("associatedtype", true)
.Case("class", !CurDeclContext || !isa<ClassDecl>(CurDeclContext))
.Case("deinit", true)
.Case("enum", true)
.Case("extension", true)
.Case("func", true)
.Case("import", true)
.Case("init", true)
.Case("let", true)
.Case("operator", true)
.Case("precedencegroup", true)
.Case("protocol", true)