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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/ImportCache.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/GenericSignature.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/CodeCompletionCache.h"
#include "swift/IDE/CodeCompletionResultPrinter.h"
#include "swift/IDE/Utils.h"
#include "swift/Parse/CodeCompletionCallbacks.h"
#include "swift/Sema/IDETypeChecking.h"
#include "swift/Sema/CodeCompletionTypeChecking.h"
#include "swift/Syntax/SyntaxKind.h"
#include "swift/Strings.h"
#include "swift/Subsystems.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/raw_ostream.h"
#include "llvm/Support/SaveAndRestore.h"
#include <algorithm>
#include <string>
using namespace swift;
using namespace ide;
using NotRecommendedReason = CodeCompletionResult::NotRecommendedReason;
using DeclFilter = std::function<bool(ValueDecl *, DeclVisibilityKind)>;
static bool DefaultFilter(ValueDecl* VD, DeclVisibilityKind Kind) {
return true;
}
static bool KeyPathFilter(ValueDecl* decl, DeclVisibilityKind) {
return isa<TypeDecl>(decl) ||
(isa<VarDecl>(decl) && decl->getDeclContext()->isTypeContext());
}
static bool SwiftKeyPathFilter(ValueDecl* decl, DeclVisibilityKind) {
switch(decl->getKind()){
case DeclKind::Var:
case DeclKind::Subscript:
return true;
default:
return false;
}
}
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;
}
llvm::StringRef swift::ide::copyString(llvm::BumpPtrAllocator &Allocator,
llvm::StringRef Str) {
char *Buffer = Allocator.Allocate<char>(Str.size());
std::copy(Str.begin(), Str.end(), Buffer);
return llvm::StringRef(Buffer, Str.size());
}
const char *swift::ide::copyCString(llvm::BumpPtrAllocator &Allocator,
llvm::StringRef Str) {
char *Buffer = Allocator.Allocate<char>(Str.size() + 1);
std::copy(Str.begin(), Str.end(), Buffer);
Buffer[Str.size()] = '\0';
return Buffer;
}
CodeCompletionString::CodeCompletionString(ArrayRef<Chunk> Chunks) {
std::uninitialized_copy(Chunks.begin(), Chunks.end(),
getTrailingObjects<Chunk>());
NumChunks = Chunks.size();
}
CodeCompletionString *CodeCompletionString::create(llvm::BumpPtrAllocator &Allocator,
ArrayRef<Chunk> Chunks) {
void *CCSMem = Allocator.Allocate(totalSizeToAlloc<Chunk>(Chunks.size()),
alignof(CodeCompletionString));
return new (CCSMem) CodeCompletionString(Chunks);
}
void CodeCompletionString::print(raw_ostream &OS) const {
unsigned PrevNestingLevel = 0;
SmallVector<StringRef, 3> closeTags;
auto chunks = getChunks();
for (auto I = chunks.begin(), E = chunks.end(); I != E; ++I) {
while (I->endsPreviousNestedGroup(PrevNestingLevel)) {
OS << closeTags.pop_back_val();
--PrevNestingLevel;
}
switch (I->getKind()) {
using ChunkKind = Chunk::ChunkKind;
case ChunkKind::AccessControlKeyword:
case ChunkKind::DeclAttrKeyword:
case ChunkKind::DeclAttrParamKeyword:
case ChunkKind::OverrideKeyword:
case ChunkKind::EffectsSpecifierKeyword:
case ChunkKind::DeclIntroducer:
case ChunkKind::Text:
case ChunkKind::LeftParen:
case ChunkKind::RightParen:
case ChunkKind::LeftBracket:
case ChunkKind::RightBracket:
case ChunkKind::LeftAngle:
case ChunkKind::RightAngle:
case ChunkKind::Dot:
case ChunkKind::Ellipsis:
case ChunkKind::Comma:
case ChunkKind::ExclamationMark:
case ChunkKind::QuestionMark:
case ChunkKind::Ampersand:
case ChunkKind::Equal:
case ChunkKind::Whitespace:
case ChunkKind::Keyword:
case ChunkKind::Attribute:
case ChunkKind::BaseName:
case ChunkKind::TypeIdSystem:
case ChunkKind::TypeIdUser:
case ChunkKind::CallArgumentName:
case ChunkKind::CallArgumentColon:
case ChunkKind::CallArgumentType:
case ChunkKind::ParameterDeclExternalName:
case ChunkKind::ParameterDeclLocalName:
case ChunkKind::ParameterDeclColon:
case ChunkKind::DeclAttrParamColon:
case ChunkKind::GenericParameterName:
if (I->isAnnotation())
OS << "['" << I->getText() << "']";
else
OS << I->getText();
break;
case ChunkKind::CallArgumentInternalName:
OS << "(" << I->getText() << ")";
break;
case ChunkKind::CallArgumentClosureType:
OS << "##" << I->getText();
break;
case ChunkKind::OptionalBegin:
case ChunkKind::CallArgumentBegin:
case ChunkKind::GenericParameterBegin:
OS << "{#";
closeTags.emplace_back("#}");
break;
case ChunkKind::DynamicLookupMethodCallTail:
case ChunkKind::OptionalMethodCallTail:
OS << I->getText();
break;
case ChunkKind::GenericParameterClauseBegin:
case ChunkKind::GenericRequirementClauseBegin:
case ChunkKind::CallArgumentTypeBegin:
case ChunkKind::DefaultArgumentClauseBegin:
case ChunkKind::ParameterDeclBegin:
case ChunkKind::EffectsSpecifierClauseBegin:
case ChunkKind::DeclResultTypeClauseBegin:
case ChunkKind::ParameterDeclTypeBegin:
case ChunkKind::AttributeAndModifierListBegin:
assert(I->getNestingLevel() == PrevNestingLevel + 1);
closeTags.emplace_back("");
break;
case ChunkKind::TypeAnnotationBegin:
OS << "[#";
closeTags.emplace_back("#]");
break;
case ChunkKind::TypeAnnotation:
OS << "[#" << I->getText() << "#]";
break;
case ChunkKind::CallArgumentClosureExpr:
OS << " {" << I->getText() << "|}";
break;
case ChunkKind::BraceStmtWithCursor:
OS << " {|}";
break;
}
PrevNestingLevel = I->getNestingLevel();
}
while (PrevNestingLevel > 0) {
OS << closeTags.pop_back_val();
--PrevNestingLevel;
}
assert(closeTags.empty());
}
void CodeCompletionString::dump() const {
llvm::raw_ostream &OS = llvm::errs();
OS << "Chunks: \n";
for (auto &chunk : getChunks()) {
OS << "- ";
for (unsigned i = 0, e = chunk.getNestingLevel(); i != e; ++i)
OS << "| ";
OS << "(";
switch (chunk.getKind()) {
#define CASE(K) case Chunk::ChunkKind::K: OS << #K; break;
CASE(AccessControlKeyword)
CASE(DeclAttrKeyword)
CASE(DeclAttrParamKeyword)
CASE(OverrideKeyword)
CASE(EffectsSpecifierKeyword)
CASE(DeclIntroducer)
CASE(Keyword)
CASE(Attribute)
CASE(Text)
CASE(BaseName)
CASE(OptionalBegin)
CASE(LeftParen)
CASE(RightParen)
CASE(LeftBracket)
CASE(RightBracket)
CASE(LeftAngle)
CASE(RightAngle)
CASE(Dot)
CASE(Ellipsis)
CASE(Comma)
CASE(ExclamationMark)
CASE(QuestionMark)
CASE(Ampersand)
CASE(Equal)
CASE(Whitespace)
CASE(GenericParameterClauseBegin)
CASE(GenericRequirementClauseBegin)
CASE(GenericParameterBegin)
CASE(GenericParameterName)
CASE(CallArgumentBegin)
CASE(CallArgumentName)
CASE(CallArgumentInternalName)
CASE(CallArgumentColon)
CASE(DeclAttrParamColon)
CASE(CallArgumentType)
CASE(CallArgumentTypeBegin)
CASE(TypeIdSystem)
CASE(TypeIdUser)
CASE(CallArgumentClosureType)
CASE(CallArgumentClosureExpr)
CASE(DynamicLookupMethodCallTail)
CASE(OptionalMethodCallTail)
CASE(ParameterDeclBegin)
CASE(ParameterDeclExternalName)
CASE(ParameterDeclLocalName)
CASE(ParameterDeclColon)
CASE(ParameterDeclTypeBegin)
CASE(DefaultArgumentClauseBegin)
CASE(EffectsSpecifierClauseBegin)
CASE(DeclResultTypeClauseBegin)
CASE(AttributeAndModifierListBegin)
CASE(TypeAnnotation)
CASE(TypeAnnotationBegin)
CASE(BraceStmtWithCursor)
}
if (chunk.isAnnotation())
OS << " [annotation]";
if (chunk.hasText()) {
OS << " \"";
OS.write_escaped(chunk.getText());
OS << "\"";
}
OS << ")\n";
}
}
CodeCompletionDeclKind
CodeCompletionResult::getCodeCompletionDeclKind(const Decl *D) {
switch (D->getKind()) {
case DeclKind::Import:
case DeclKind::Extension:
case DeclKind::PatternBinding:
case DeclKind::EnumCase:
case DeclKind::TopLevelCode:
case DeclKind::IfConfig:
case DeclKind::PoundDiagnostic:
case DeclKind::MissingMember:
case DeclKind::OpaqueType:
llvm_unreachable("not expecting such a declaration result");
case DeclKind::Module:
return CodeCompletionDeclKind::Module;
case DeclKind::TypeAlias:
return CodeCompletionDeclKind::TypeAlias;
case DeclKind::AssociatedType:
return CodeCompletionDeclKind::AssociatedType;
case DeclKind::GenericTypeParam:
return CodeCompletionDeclKind::GenericTypeParam;
case DeclKind::Enum:
return CodeCompletionDeclKind::Enum;
case DeclKind::Struct:
return CodeCompletionDeclKind::Struct;
case DeclKind::Class:
return CodeCompletionDeclKind::Class;
case DeclKind::Protocol:
return CodeCompletionDeclKind::Protocol;
case DeclKind::Var:
case DeclKind::Param: {
auto DC = D->getDeclContext();
if (DC->isTypeContext()) {
if (cast<VarDecl>(D)->isStatic())
return CodeCompletionDeclKind::StaticVar;
else
return CodeCompletionDeclKind::InstanceVar;
}
if (DC->isLocalContext())
return CodeCompletionDeclKind::LocalVar;
return CodeCompletionDeclKind::GlobalVar;
}
case DeclKind::Constructor:
return CodeCompletionDeclKind::Constructor;
case DeclKind::Destructor:
return CodeCompletionDeclKind::Destructor;
case DeclKind::Accessor:
case DeclKind::Func: {
auto DC = D->getDeclContext();
auto FD = cast<FuncDecl>(D);
if (DC->isTypeContext()) {
if (FD->isStatic())
return CodeCompletionDeclKind::StaticMethod;
return CodeCompletionDeclKind::InstanceMethod;
}
if (FD->isOperator()) {
if (auto op = FD->getOperatorDecl()) {
switch (op->getKind()) {
case DeclKind::PrefixOperator:
return CodeCompletionDeclKind::PrefixOperatorFunction;
case DeclKind::PostfixOperator:
return CodeCompletionDeclKind::PostfixOperatorFunction;
case DeclKind::InfixOperator:
return CodeCompletionDeclKind::InfixOperatorFunction;
default:
llvm_unreachable("unexpected operator kind");
}
} else {
return CodeCompletionDeclKind::InfixOperatorFunction;
}
}
return CodeCompletionDeclKind::FreeFunction;
}
case DeclKind::InfixOperator:
return CodeCompletionDeclKind::InfixOperatorFunction;
case DeclKind::PrefixOperator:
return CodeCompletionDeclKind::PrefixOperatorFunction;
case DeclKind::PostfixOperator:
return CodeCompletionDeclKind::PostfixOperatorFunction;
case DeclKind::PrecedenceGroup:
return CodeCompletionDeclKind::PrecedenceGroup;
case DeclKind::EnumElement:
return CodeCompletionDeclKind::EnumElement;
case DeclKind::Subscript:
return CodeCompletionDeclKind::Subscript;
}
llvm_unreachable("invalid DeclKind");
}
bool CodeCompletionResult::getDeclIsSystem(const Decl *D) {
return D->getModuleContext()->isSystemModule();
}
void CodeCompletionResult::printPrefix(raw_ostream &OS) const {
llvm::SmallString<64> Prefix;
switch (getKind()) {
case ResultKind::Declaration:
Prefix.append("Decl");
switch (getAssociatedDeclKind()) {
case CodeCompletionDeclKind::Class:
Prefix.append("[Class]");
break;
case CodeCompletionDeclKind::Struct:
Prefix.append("[Struct]");
break;
case CodeCompletionDeclKind::Enum:
Prefix.append("[Enum]");
break;
case CodeCompletionDeclKind::EnumElement:
Prefix.append("[EnumElement]");
break;
case CodeCompletionDeclKind::Protocol:
Prefix.append("[Protocol]");
break;
case CodeCompletionDeclKind::TypeAlias:
Prefix.append("[TypeAlias]");
break;
case CodeCompletionDeclKind::AssociatedType:
Prefix.append("[AssociatedType]");
break;
case CodeCompletionDeclKind::GenericTypeParam:
Prefix.append("[GenericTypeParam]");
break;
case CodeCompletionDeclKind::Constructor:
Prefix.append("[Constructor]");
break;
case CodeCompletionDeclKind::Destructor:
Prefix.append("[Destructor]");
break;
case CodeCompletionDeclKind::Subscript:
Prefix.append("[Subscript]");
break;
case CodeCompletionDeclKind::StaticMethod:
Prefix.append("[StaticMethod]");
break;
case CodeCompletionDeclKind::InstanceMethod:
Prefix.append("[InstanceMethod]");
break;
case CodeCompletionDeclKind::PrefixOperatorFunction:
Prefix.append("[PrefixOperatorFunction]");
break;
case CodeCompletionDeclKind::PostfixOperatorFunction:
Prefix.append("[PostfixOperatorFunction]");
break;
case CodeCompletionDeclKind::InfixOperatorFunction:
Prefix.append("[InfixOperatorFunction]");
break;
case CodeCompletionDeclKind::FreeFunction:
Prefix.append("[FreeFunction]");
break;
case CodeCompletionDeclKind::StaticVar:
Prefix.append("[StaticVar]");
break;
case CodeCompletionDeclKind::InstanceVar:
Prefix.append("[InstanceVar]");
break;
case CodeCompletionDeclKind::LocalVar:
Prefix.append("[LocalVar]");
break;
case CodeCompletionDeclKind::GlobalVar:
Prefix.append("[GlobalVar]");
break;
case CodeCompletionDeclKind::Module:
Prefix.append("[Module]");
break;
case CodeCompletionDeclKind::PrecedenceGroup:
Prefix.append("[PrecedenceGroup]");
break;
}
break;
case ResultKind::Keyword:
Prefix.append("Keyword");
switch (getKeywordKind()) {
case CodeCompletionKeywordKind::None:
break;
#define KEYWORD(X) case CodeCompletionKeywordKind::kw_##X: \
Prefix.append("[" #X "]"); \
break;
#define POUND_KEYWORD(X) case CodeCompletionKeywordKind::pound_##X: \
Prefix.append("[#" #X "]"); \
break;
#include "swift/Syntax/TokenKinds.def"
}
break;
case ResultKind::Pattern:
Prefix.append("Pattern");
break;
case ResultKind::Literal:
Prefix.append("Literal");
switch (getLiteralKind()) {
case CodeCompletionLiteralKind::ArrayLiteral:
Prefix.append("[Array]");
break;
case CodeCompletionLiteralKind::BooleanLiteral:
Prefix.append("[Boolean]");
break;
case CodeCompletionLiteralKind::ColorLiteral:
Prefix.append("[_Color]");
break;
case CodeCompletionLiteralKind::ImageLiteral:
Prefix.append("[_Image]");
break;
case CodeCompletionLiteralKind::DictionaryLiteral:
Prefix.append("[Dictionary]");
break;
case CodeCompletionLiteralKind::IntegerLiteral:
Prefix.append("[Integer]");
break;
case CodeCompletionLiteralKind::NilLiteral:
Prefix.append("[Nil]");
break;
case CodeCompletionLiteralKind::StringLiteral:
Prefix.append("[String]");
break;
case CodeCompletionLiteralKind::Tuple:
Prefix.append("[Tuple]");
break;
}
break;
case ResultKind::BuiltinOperator:
Prefix.append("BuiltinOperator");
break;
}
Prefix.append("/");
switch (getSemanticContext()) {
case SemanticContextKind::None:
Prefix.append("None");
break;
case SemanticContextKind::Local:
Prefix.append("Local");
break;
case SemanticContextKind::CurrentNominal:
Prefix.append("CurrNominal");
break;
case SemanticContextKind::Super:
Prefix.append("Super");
break;
case SemanticContextKind::OutsideNominal:
Prefix.append("OutNominal");
break;
case SemanticContextKind::CurrentModule:
Prefix.append("CurrModule");
break;
case SemanticContextKind::OtherModule:
Prefix.append("OtherModule");
if (!ModuleName.empty())
Prefix.append((Twine("[") + ModuleName + "]").str());
break;
}
if (getFlair().toRaw()) {
Prefix.append("/Flair[");
bool isFirstFlair = true;
#define PRINT_FLAIR(KIND, NAME) \
if (getFlair().contains(CodeCompletionFlairBit::KIND)) { \
if (isFirstFlair) { isFirstFlair = false; } \
else { Prefix.append(","); } \
Prefix.append(NAME); \
}
PRINT_FLAIR(ExpressionSpecific, "ExprSpecific");
PRINT_FLAIR(SuperChain, "SuperChain");
PRINT_FLAIR(ArgumentLabels, "ArgLabels");
PRINT_FLAIR(CommonKeywordAtCurrentPosition, "CommonKeyword")
PRINT_FLAIR(RareKeywordAtCurrentPosition, "RareKeyword")
PRINT_FLAIR(RareTypeAtCurrentPosition, "RareType")
PRINT_FLAIR(ExpressionAtNonScriptOrMainFileScope, "ExprAtFileScope")
Prefix.append("]");
}
if (NotRecommended)
Prefix.append("/NotRecommended");
if (IsSystem)
Prefix.append("/IsSystem");
if (NumBytesToErase != 0) {
Prefix.append("/Erase[");
Prefix.append(Twine(NumBytesToErase).str());
Prefix.append("]");
}
switch (getExpectedTypeRelation()) {
case ExpectedTypeRelation::Invalid:
Prefix.append("/TypeRelation[Invalid]");
break;
case ExpectedTypeRelation::Identical:
Prefix.append("/TypeRelation[Identical]");
break;
case ExpectedTypeRelation::Convertible:
Prefix.append("/TypeRelation[Convertible]");
break;
case ExpectedTypeRelation::NotApplicable:
case ExpectedTypeRelation::Unknown:
case ExpectedTypeRelation::Unrelated:
break;
}
Prefix.append(": ");
while (Prefix.size() < 36) {
Prefix.append(" ");
}
OS << Prefix;
}
void CodeCompletionResult::dump() const {
printPrefix(llvm::errs());
CompletionString->print(llvm::errs());
llvm::errs() << "\n";
}
CodeCompletionResult *
CodeCompletionResult::withFlair(CodeCompletionFlair newFlair,
CodeCompletionResultSink &Sink) {
if (Kind == ResultKind::Declaration) {
return new (*Sink.Allocator) CodeCompletionResult(
getSemanticContext(), newFlair, getNumBytesToErase(),
getCompletionString(), getAssociatedDeclKind(), isSystem(),
getModuleName(), getNotRecommendedReason(), getDiagnosticSeverity(),
getDiagnosticMessage(), getBriefDocComment(), getAssociatedUSRs(),
getExpectedTypeRelation(),
isOperator() ? getOperatorKind() : CodeCompletionOperatorKind::None);
} else {
return new (*Sink.Allocator) CodeCompletionResult(
getKind(), getSemanticContext(), newFlair, getNumBytesToErase(),
getCompletionString(), getExpectedTypeRelation(),
isOperator() ? getOperatorKind() : CodeCompletionOperatorKind::None);
}
}
void CodeCompletionResultBuilder::withNestedGroup(
CodeCompletionString::Chunk::ChunkKind Kind,
llvm::function_ref<void()> body) {
++CurrentNestingLevel;
addSimpleChunk(Kind);
body();
--CurrentNestingLevel;
}
void CodeCompletionResultBuilder::addChunkWithText(
CodeCompletionString::Chunk::ChunkKind Kind, StringRef Text) {
addChunkWithTextNoCopy(Kind, copyString(*Sink.Allocator, Text));
}
void CodeCompletionResultBuilder::setAssociatedDecl(const Decl *D) {
assert(Kind == CodeCompletionResult::ResultKind::Declaration);
AssociatedDecl = D;
if (auto *ClangD = D->getClangDecl())
CurrentModule = ClangD->getImportedOwningModule();
// FIXME: macros
// FIXME: imported header module
if (!CurrentModule) {
ModuleDecl *MD = D->getModuleContext();
// If this is an underscored cross-import overlay, map it to the underlying
// module that declares it instead.
if (ModuleDecl *Declaring = MD->getDeclaringModuleIfCrossImportOverlay())
MD = Declaring;
CurrentModule = MD;
}
if (D->getAttrs().getDeprecated(D->getASTContext()))
setNotRecommended(NotRecommendedReason::Deprecated);
else if (D->getAttrs().getSoftDeprecated(D->getASTContext()))
setNotRecommended(NotRecommendedReason::SoftDeprecated);
if (D->getClangNode()) {
if (auto *ClangD = D->getClangDecl()) {
const auto &ClangContext = ClangD->getASTContext();
if (const clang::RawComment *RC =
ClangContext.getRawCommentForAnyRedecl(ClangD)) {
setBriefDocComment(RC->getBriefText(ClangContext));
}
}
} else {
setBriefDocComment(AssociatedDecl->getBriefComment());
}
}
namespace {
/// 'ASTPrinter' printing to 'CodeCompletionString' with appropriate ChunkKind.
/// This is mainly used for printing types and override completions.
class CodeCompletionStringPrinter : public ASTPrinter {
protected:
using ChunkKind = CodeCompletionString::Chunk::ChunkKind;
private:
CodeCompletionResultBuilder &Builder;
SmallString<16> Buffer;
ChunkKind CurrChunkKind = ChunkKind::Text;
ChunkKind NextChunkKind = ChunkKind::Text;
SmallVector<PrintStructureKind, 2> StructureStack;
unsigned int TypeDepth = 0;
bool InPreamble = false;
bool isCurrentStructureKind(PrintStructureKind Kind) const {
return !StructureStack.empty() && StructureStack.back() == Kind;
}
bool isInType() const {
return TypeDepth > 0;
}
Optional<ChunkKind>
getChunkKindForPrintNameContext(PrintNameContext context) const {
switch (context) {
case PrintNameContext::Keyword:
if(isCurrentStructureKind(PrintStructureKind::EffectsSpecifiers)) {
return ChunkKind::EffectsSpecifierKeyword;
}
return ChunkKind::Keyword;
case PrintNameContext::IntroducerKeyword:
return ChunkKind::DeclIntroducer;
case PrintNameContext::Attribute:
return ChunkKind::Attribute;
case PrintNameContext::FunctionParameterExternal:
if (isInType()) {
return None;
}
return ChunkKind::ParameterDeclExternalName;
case PrintNameContext::FunctionParameterLocal:
if (isInType()) {
return None;
}
return ChunkKind::ParameterDeclLocalName;
default:
return None;
}
}
Optional<ChunkKind>
getChunkKindForStructureKind(PrintStructureKind Kind) const {
switch (Kind) {
case PrintStructureKind::FunctionParameter:
if (isInType()) {
return None;
}
return ChunkKind::ParameterDeclBegin;
case PrintStructureKind::DefaultArgumentClause:
return ChunkKind::DefaultArgumentClauseBegin;
case PrintStructureKind::DeclGenericParameterClause:
return ChunkKind::GenericParameterClauseBegin;
case PrintStructureKind::DeclGenericRequirementClause:
return ChunkKind::GenericRequirementClauseBegin;
case PrintStructureKind::EffectsSpecifiers:
return ChunkKind::EffectsSpecifierClauseBegin;
case PrintStructureKind::DeclResultTypeClause:
return ChunkKind::DeclResultTypeClauseBegin;
case PrintStructureKind::FunctionParameterType:
return ChunkKind::ParameterDeclTypeBegin;
default:
return None;
}
}
void startNestedGroup(ChunkKind Kind) {
flush();
Builder.CurrentNestingLevel++;
Builder.addSimpleChunk(Kind);
}
void endNestedGroup() {
flush();
Builder.CurrentNestingLevel--;
}
protected:
void setNextChunkKind(ChunkKind Kind) {
NextChunkKind = Kind;
}
public:
CodeCompletionStringPrinter(CodeCompletionResultBuilder &Builder) : Builder(Builder) {}
~CodeCompletionStringPrinter() {
// Flush the remainings.
flush();
}
void flush() {
if (Buffer.empty())
return;
Builder.addChunkWithText(CurrChunkKind, Buffer);
Buffer.clear();
}
/// Start \c AttributeAndModifierListBegin group. This must be called before
/// any attributes/modifiers printed to the output when printing an override
/// compleion.
void startPreamble() {
assert(!InPreamble);
startNestedGroup(ChunkKind::AttributeAndModifierListBegin);
InPreamble = true;
}
/// End the current \c AttributeAndModifierListBegin group if it's still open.
/// This is automatically called before the main part of the signature.
void endPremable() {
if (!InPreamble)
return;
InPreamble = false;
endNestedGroup();
}
/// Implement \c ASTPrinter .
public:
void printText(StringRef Text) override {
// Detect ': ' and ', ' in parameter clauses.
// FIXME: Is there a better way?
if (isCurrentStructureKind(PrintStructureKind::FunctionParameter) &&
Text == ": ") {
setNextChunkKind(ChunkKind::ParameterDeclColon);
} else if (
isCurrentStructureKind(PrintStructureKind::FunctionParameterList) &&
Text == ", ") {
setNextChunkKind(ChunkKind::Comma);
}
if (CurrChunkKind != NextChunkKind) {
// If the next desired kind is different from the current buffer, flush
// the current buffer.
flush();
CurrChunkKind = NextChunkKind;
}
Buffer.append(Text);
}
void printTypeRef(
Type T, const TypeDecl *TD, Identifier Name,
PrintNameContext NameContext = PrintNameContext::Normal) override {
NextChunkKind = TD->getModuleContext()->isSystemModule()
? ChunkKind::TypeIdSystem
: ChunkKind::TypeIdUser;
ASTPrinter::printTypeRef(T, TD, Name, NameContext);
NextChunkKind = ChunkKind::Text;
}
void printDeclLoc(const Decl *D) override {
endPremable();
setNextChunkKind(ChunkKind::BaseName);
}
void printDeclNameEndLoc(const Decl *D) override {
setNextChunkKind(ChunkKind::Text);
}
void printNamePre(PrintNameContext context) override {
if (context == PrintNameContext::IntroducerKeyword)
endPremable();
if (auto Kind = getChunkKindForPrintNameContext(context))
setNextChunkKind(*Kind);
}
void printNamePost(PrintNameContext context) override {
if (getChunkKindForPrintNameContext(context))
setNextChunkKind(ChunkKind::Text);
}
void printTypePre(const TypeLoc &TL) override {
++TypeDepth;
}
void printTypePost(const TypeLoc &TL) override {
assert(TypeDepth > 0);
--TypeDepth;
}
void printStructurePre(PrintStructureKind Kind, const Decl *D) override {
StructureStack.push_back(Kind);
if (auto chunkKind = getChunkKindForStructureKind(Kind))
startNestedGroup(*chunkKind);
}
void printStructurePost(PrintStructureKind Kind, const Decl *D) override {
if (getChunkKindForStructureKind(Kind))
endNestedGroup();
assert(Kind == StructureStack.back());
StructureStack.pop_back();
}
};
} // namespcae
void CodeCompletionResultBuilder::addCallArgument(
Identifier Name, Identifier LocalName, Type Ty, Type ContextTy,
bool IsVarArg, bool IsInOut, bool IsIUO, bool isAutoClosure,
bool useUnderscoreLabel, bool isLabeledTrailingClosure) {
++CurrentNestingLevel;
using ChunkKind = CodeCompletionString::Chunk::ChunkKind;
addSimpleChunk(ChunkKind::CallArgumentBegin);
if (shouldAnnotateResults()) {
if (!Name.empty() || !LocalName.empty()) {
llvm::SmallString<16> EscapedKeyword;
if (!Name.empty()) {
addChunkWithText(
CodeCompletionString::Chunk::ChunkKind::CallArgumentName,
escapeKeyword(Name.str(), false, EscapedKeyword));
if (!LocalName.empty() && Name != LocalName) {
addChunkWithTextNoCopy(ChunkKind::Text, " ");
getLastChunk().setIsAnnotation();
addChunkWithText(ChunkKind::CallArgumentInternalName,
escapeKeyword(LocalName.str(), false, EscapedKeyword));
getLastChunk().setIsAnnotation();
}
} else {
assert(!LocalName.empty());
addChunkWithTextNoCopy(ChunkKind::CallArgumentName, "_");
getLastChunk().setIsAnnotation();
addChunkWithTextNoCopy(ChunkKind::Text, " ");
getLastChunk().setIsAnnotation();
addChunkWithText(ChunkKind::CallArgumentInternalName,
escapeKeyword(LocalName.str(), false, EscapedKeyword));
}
addChunkWithTextNoCopy(ChunkKind::CallArgumentColon, ": ");
}
} else {
if (!Name.empty()) {
llvm::SmallString<16> EscapedKeyword;
addChunkWithText(
CodeCompletionString::Chunk::ChunkKind::CallArgumentName,
escapeKeyword(Name.str(), false, EscapedKeyword));
addChunkWithTextNoCopy(
CodeCompletionString::Chunk::ChunkKind::CallArgumentColon, ": ");
} else if (useUnderscoreLabel) {
addChunkWithTextNoCopy(
CodeCompletionString::Chunk::ChunkKind::CallArgumentName, "_");
addChunkWithTextNoCopy(
CodeCompletionString::Chunk::ChunkKind::CallArgumentColon, ": ");
} else if (!LocalName.empty()) {
// Use local (non-API) parameter name if we have nothing else.
llvm::SmallString<16> EscapedKeyword;
addChunkWithText(
CodeCompletionString::Chunk::ChunkKind::CallArgumentInternalName,
escapeKeyword(LocalName.str(), false, EscapedKeyword));
addChunkWithTextNoCopy(
CodeCompletionString::Chunk::ChunkKind::CallArgumentColon, ": ");
}
}
// 'inout' arguments are printed specially.
if (IsInOut) {
addChunkWithTextNoCopy(
CodeCompletionString::Chunk::ChunkKind::Ampersand, "&");
Ty = Ty->getInOutObjectType();
}
// If the parameter is of the type @autoclosure ()->output, then the
// code completion should show the parameter of the output type
// instead of the function type ()->output.
if (isAutoClosure) {
// 'Ty' may be ErrorType.
if (auto funcTy = Ty->getAs<FunctionType>())
Ty = funcTy->getResult();
}
PrintOptions PO;
PO.SkipAttributes = true;
PO.PrintOptionalAsImplicitlyUnwrapped = IsIUO;
PO.OpaqueReturnTypePrinting =
PrintOptions::OpaqueReturnTypePrintingMode::WithoutOpaqueKeyword;
if (ContextTy)
PO.setBaseType(ContextTy);
if (shouldAnnotateResults()) {
withNestedGroup(ChunkKind::CallArgumentTypeBegin, [&]() {
CodeCompletionStringPrinter printer(*this);
auto TL = TypeLoc::withoutLoc(Ty);
printer.printTypePre(TL);
Ty->print(printer, PO);
printer.printTypePost(TL);