forked from OSchip/llvm-project
470 lines
13 KiB
C++
470 lines
13 KiB
C++
//===--- CodeCompleteConsumer.cpp - Code Completion Interface ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the CodeCompleteConsumer class.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Sema/CodeCompleteConsumer.h"
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#include "clang/Sema/Scope.h"
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#include "clang/Sema/Sema.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/DeclObjC.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/Lex/Preprocessor.h"
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#include "clang-c/Index.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cstring>
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#include <functional>
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using namespace clang;
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using llvm::StringRef;
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//===----------------------------------------------------------------------===//
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// Code completion context implementation
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//===----------------------------------------------------------------------===//
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bool CodeCompletionContext::wantConstructorResults() const {
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switch (Kind) {
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case CCC_Recovery:
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case CCC_Statement:
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case CCC_Expression:
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case CCC_ObjCMessageReceiver:
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case CCC_ParenthesizedExpression:
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return true;
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case CCC_TopLevel:
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case CCC_ObjCInterface:
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case CCC_ObjCImplementation:
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case CCC_ObjCIvarList:
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case CCC_ClassStructUnion:
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case CCC_MemberAccess:
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case CCC_EnumTag:
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case CCC_UnionTag:
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case CCC_ClassOrStructTag:
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case CCC_ObjCProtocolName:
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case CCC_Namespace:
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case CCC_Type:
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case CCC_Name:
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case CCC_PotentiallyQualifiedName:
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case CCC_MacroName:
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case CCC_MacroNameUse:
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case CCC_PreprocessorExpression:
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case CCC_PreprocessorDirective:
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case CCC_NaturalLanguage:
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case CCC_SelectorName:
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case CCC_TypeQualifiers:
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case CCC_Other:
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case CCC_OtherWithMacros:
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return false;
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}
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return false;
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}
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//===----------------------------------------------------------------------===//
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// Code completion string implementation
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//===----------------------------------------------------------------------===//
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CodeCompletionString::Chunk::Chunk(ChunkKind Kind, const char *Text)
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: Kind(Kind), Text("")
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{
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switch (Kind) {
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case CK_TypedText:
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case CK_Text:
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case CK_Placeholder:
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case CK_Informative:
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case CK_ResultType:
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case CK_CurrentParameter:
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this->Text = Text;
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break;
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case CK_Optional:
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llvm_unreachable("Optional strings cannot be created from text");
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break;
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case CK_LeftParen:
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this->Text = "(";
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break;
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case CK_RightParen:
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this->Text = ")";
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break;
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case CK_LeftBracket:
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this->Text = "[";
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break;
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case CK_RightBracket:
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this->Text = "]";
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break;
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case CK_LeftBrace:
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this->Text = "{";
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break;
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case CK_RightBrace:
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this->Text = "}";
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break;
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case CK_LeftAngle:
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this->Text = "<";
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break;
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case CK_RightAngle:
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this->Text = ">";
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break;
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case CK_Comma:
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this->Text = ", ";
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break;
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case CK_Colon:
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this->Text = ":";
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break;
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case CK_SemiColon:
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this->Text = ";";
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break;
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case CK_Equal:
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this->Text = " = ";
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break;
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case CK_HorizontalSpace:
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this->Text = " ";
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break;
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case CK_VerticalSpace:
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this->Text = "\n";
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break;
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}
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreateText(const char *Text) {
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return Chunk(CK_Text, Text);
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreateOptional(CodeCompletionString *Optional) {
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Chunk Result;
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Result.Kind = CK_Optional;
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Result.Optional = Optional;
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return Result;
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreatePlaceholder(const char *Placeholder) {
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return Chunk(CK_Placeholder, Placeholder);
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreateInformative(const char *Informative) {
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return Chunk(CK_Informative, Informative);
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreateResultType(const char *ResultType) {
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return Chunk(CK_ResultType, ResultType);
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}
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CodeCompletionString::Chunk
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CodeCompletionString::Chunk::CreateCurrentParameter(
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const char *CurrentParameter) {
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return Chunk(CK_CurrentParameter, CurrentParameter);
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}
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CodeCompletionString::CodeCompletionString(const Chunk *Chunks,
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unsigned NumChunks,
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unsigned Priority,
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CXAvailabilityKind Availability)
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: NumChunks(NumChunks), Priority(Priority), Availability(Availability)
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{
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Chunk *StoredChunks = reinterpret_cast<Chunk *>(this + 1);
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for (unsigned I = 0; I != NumChunks; ++I)
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StoredChunks[I] = Chunks[I];
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}
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std::string CodeCompletionString::getAsString() const {
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std::string Result;
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llvm::raw_string_ostream OS(Result);
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for (iterator C = begin(), CEnd = end(); C != CEnd; ++C) {
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switch (C->Kind) {
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case CK_Optional: OS << "{#" << C->Optional->getAsString() << "#}"; break;
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case CK_Placeholder: OS << "<#" << C->Text << "#>"; break;
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case CK_Informative:
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case CK_ResultType:
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OS << "[#" << C->Text << "#]";
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break;
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case CK_CurrentParameter: OS << "<#" << C->Text << "#>"; break;
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default: OS << C->Text; break;
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}
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}
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return OS.str();
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}
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const char *CodeCompletionString::getTypedText() const {
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for (iterator C = begin(), CEnd = end(); C != CEnd; ++C)
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if (C->Kind == CK_TypedText)
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return C->Text;
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return 0;
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}
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const char *CodeCompletionAllocator::CopyString(llvm::StringRef String) {
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char *Mem = (char *)Allocate(String.size() + 1, 1);
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std::copy(String.begin(), String.end(), Mem);
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Mem[String.size()] = 0;
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return Mem;
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}
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const char *CodeCompletionAllocator::CopyString(llvm::Twine String) {
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// FIXME: It would be more efficient to teach Twine to tell us its size and
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// then add a routine there to fill in an allocated char* with the contents
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// of the string.
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llvm::SmallString<128> Data;
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return CopyString(String.toStringRef(Data));
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}
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CodeCompletionString *CodeCompletionBuilder::TakeString() {
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void *Mem = Allocator.Allocate(
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sizeof(CodeCompletionString) + sizeof(Chunk) * Chunks.size(),
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llvm::alignOf<CodeCompletionString>());
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CodeCompletionString *Result
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= new (Mem) CodeCompletionString(Chunks.data(), Chunks.size(),
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Priority, Availability);
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Chunks.clear();
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return Result;
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}
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unsigned CodeCompletionResult::getPriorityFromDecl(NamedDecl *ND) {
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if (!ND)
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return CCP_Unlikely;
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// Context-based decisions.
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DeclContext *DC = ND->getDeclContext()->getRedeclContext();
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if (DC->isFunctionOrMethod() || isa<BlockDecl>(DC)) {
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// _cmd is relatively rare
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if (ImplicitParamDecl *ImplicitParam = dyn_cast<ImplicitParamDecl>(ND))
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if (ImplicitParam->getIdentifier() &&
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ImplicitParam->getIdentifier()->isStr("_cmd"))
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return CCP_ObjC_cmd;
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return CCP_LocalDeclaration;
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}
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if (DC->isRecord() || isa<ObjCContainerDecl>(DC))
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return CCP_MemberDeclaration;
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// Content-based decisions.
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if (isa<EnumConstantDecl>(ND))
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return CCP_Constant;
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if (isa<TypeDecl>(ND) || isa<ObjCInterfaceDecl>(ND))
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return CCP_Type;
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return CCP_Declaration;
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}
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//===----------------------------------------------------------------------===//
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// Code completion overload candidate implementation
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//===----------------------------------------------------------------------===//
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FunctionDecl *
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CodeCompleteConsumer::OverloadCandidate::getFunction() const {
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if (getKind() == CK_Function)
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return Function;
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else if (getKind() == CK_FunctionTemplate)
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return FunctionTemplate->getTemplatedDecl();
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else
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return 0;
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}
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const FunctionType *
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CodeCompleteConsumer::OverloadCandidate::getFunctionType() const {
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switch (Kind) {
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case CK_Function:
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return Function->getType()->getAs<FunctionType>();
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case CK_FunctionTemplate:
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return FunctionTemplate->getTemplatedDecl()->getType()
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->getAs<FunctionType>();
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case CK_FunctionType:
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return Type;
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}
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return 0;
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}
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//===----------------------------------------------------------------------===//
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// Code completion consumer implementation
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//===----------------------------------------------------------------------===//
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CodeCompleteConsumer::~CodeCompleteConsumer() { }
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void
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PrintingCodeCompleteConsumer::ProcessCodeCompleteResults(Sema &SemaRef,
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CodeCompletionContext Context,
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CodeCompletionResult *Results,
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unsigned NumResults) {
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std::stable_sort(Results, Results + NumResults);
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// Print the results.
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for (unsigned I = 0; I != NumResults; ++I) {
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OS << "COMPLETION: ";
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switch (Results[I].Kind) {
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case CodeCompletionResult::RK_Declaration:
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OS << Results[I].Declaration;
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if (Results[I].Hidden)
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OS << " (Hidden)";
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if (CodeCompletionString *CCS
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= Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
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OS << " : " << CCS->getAsString();
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}
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OS << '\n';
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break;
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case CodeCompletionResult::RK_Keyword:
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OS << Results[I].Keyword << '\n';
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break;
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case CodeCompletionResult::RK_Macro: {
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OS << Results[I].Macro->getName();
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if (CodeCompletionString *CCS
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= Results[I].CreateCodeCompletionString(SemaRef, Allocator)) {
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OS << " : " << CCS->getAsString();
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}
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OS << '\n';
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break;
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}
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case CodeCompletionResult::RK_Pattern: {
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OS << "Pattern : "
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<< Results[I].Pattern->getAsString() << '\n';
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break;
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}
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}
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}
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}
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void
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PrintingCodeCompleteConsumer::ProcessOverloadCandidates(Sema &SemaRef,
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unsigned CurrentArg,
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OverloadCandidate *Candidates,
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unsigned NumCandidates) {
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for (unsigned I = 0; I != NumCandidates; ++I) {
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if (CodeCompletionString *CCS
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= Candidates[I].CreateSignatureString(CurrentArg, SemaRef,
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Allocator)) {
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OS << "OVERLOAD: " << CCS->getAsString() << "\n";
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}
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}
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}
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void CodeCompletionResult::computeCursorKindAndAvailability() {
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switch (Kind) {
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case RK_Declaration:
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// Set the availability based on attributes.
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switch (Declaration->getAvailability()) {
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case AR_Available:
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case AR_NotYetIntroduced:
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Availability = CXAvailability_Available;
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break;
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case AR_Deprecated:
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Availability = CXAvailability_Deprecated;
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break;
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case AR_Unavailable:
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Availability = CXAvailability_NotAvailable;
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break;
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}
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if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Declaration))
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if (Function->isDeleted())
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Availability = CXAvailability_NotAvailable;
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CursorKind = getCursorKindForDecl(Declaration);
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if (CursorKind == CXCursor_UnexposedDecl)
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CursorKind = CXCursor_NotImplemented;
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break;
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case RK_Macro:
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Availability = CXAvailability_Available;
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CursorKind = CXCursor_MacroDefinition;
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break;
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case RK_Keyword:
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Availability = CXAvailability_Available;
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CursorKind = CXCursor_NotImplemented;
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break;
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case RK_Pattern:
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// Do nothing: Patterns can come with cursor kinds!
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break;
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}
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}
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/// \brief Retrieve the name that should be used to order a result.
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///
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/// If the name needs to be constructed as a string, that string will be
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/// saved into Saved and the returned StringRef will refer to it.
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static llvm::StringRef getOrderedName(const CodeCompletionResult &R,
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std::string &Saved) {
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switch (R.Kind) {
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case CodeCompletionResult::RK_Keyword:
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return R.Keyword;
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case CodeCompletionResult::RK_Pattern:
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return R.Pattern->getTypedText();
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case CodeCompletionResult::RK_Macro:
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return R.Macro->getName();
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case CodeCompletionResult::RK_Declaration:
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// Handle declarations below.
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break;
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}
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DeclarationName Name = R.Declaration->getDeclName();
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// If the name is a simple identifier (by far the common case), or a
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// zero-argument selector, just return a reference to that identifier.
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if (IdentifierInfo *Id = Name.getAsIdentifierInfo())
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return Id->getName();
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if (Name.isObjCZeroArgSelector())
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if (IdentifierInfo *Id
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= Name.getObjCSelector().getIdentifierInfoForSlot(0))
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return Id->getName();
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Saved = Name.getAsString();
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return Saved;
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}
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bool clang::operator<(const CodeCompletionResult &X,
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const CodeCompletionResult &Y) {
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std::string XSaved, YSaved;
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llvm::StringRef XStr = getOrderedName(X, XSaved);
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llvm::StringRef YStr = getOrderedName(Y, YSaved);
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int cmp = XStr.compare_lower(YStr);
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if (cmp)
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return cmp < 0;
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// If case-insensitive comparison fails, try case-sensitive comparison.
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cmp = XStr.compare(YStr);
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if (cmp)
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return cmp < 0;
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return false;
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}
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