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f3ecb63f30
This will let us implement caching in the client (e.g. SourceKit) at some point and simplifies adding more levels of caching. Requires a corresponding SourceKit change. Swift SVN r28365
314 lines
11 KiB
C++
314 lines
11 KiB
C++
//===--- REPLCodeCompletion.cpp - Code completion for REPL ----------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This module provides completions to the immediate mode environment.
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//
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//===----------------------------------------------------------------------===//
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#include "swift/IDE/REPLCodeCompletion.h"
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#include "swift/AST/ASTContext.h"
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#include "swift/AST/Module.h"
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#include "swift/Basic/LLVM.h"
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#include "swift/Basic/SourceManager.h"
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#include "swift/Parse/DelayedParsingCallbacks.h"
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#include "swift/Parse/Parser.h"
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#include "swift/IDE/CodeCompletion.h"
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#include "swift/Subsystems.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/ADT/SmallString.h"
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#include <algorithm>
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using namespace swift;
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using namespace ide;
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static std::string toInsertableString(CodeCompletionResult *Result) {
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std::string Str;
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for (auto C : Result->getCompletionString()->getChunks()) {
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switch (C.getKind()) {
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case CodeCompletionString::Chunk::ChunkKind::AccessControlKeyword:
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case CodeCompletionString::Chunk::ChunkKind::OverrideKeyword:
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case CodeCompletionString::Chunk::ChunkKind::DeclAttrKeyword:
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case CodeCompletionString::Chunk::ChunkKind::DeclIntroducer:
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case CodeCompletionString::Chunk::ChunkKind::Text:
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case CodeCompletionString::Chunk::ChunkKind::LeftParen:
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case CodeCompletionString::Chunk::ChunkKind::RightParen:
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case CodeCompletionString::Chunk::ChunkKind::LeftBracket:
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case CodeCompletionString::Chunk::ChunkKind::RightBracket:
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case CodeCompletionString::Chunk::ChunkKind::LeftAngle:
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case CodeCompletionString::Chunk::ChunkKind::RightAngle:
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case CodeCompletionString::Chunk::ChunkKind::Dot:
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case CodeCompletionString::Chunk::ChunkKind::Ellipsis:
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case CodeCompletionString::Chunk::ChunkKind::Comma:
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case CodeCompletionString::Chunk::ChunkKind::ExclamationMark:
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case CodeCompletionString::Chunk::ChunkKind::QuestionMark:
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case CodeCompletionString::Chunk::ChunkKind::Ampersand:
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case CodeCompletionString::Chunk::ChunkKind::DynamicLookupMethodCallTail:
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case CodeCompletionString::Chunk::ChunkKind::OptionalMethodCallTail:
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if (!C.isAnnotation())
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Str += C.getText();
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break;
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case CodeCompletionString::Chunk::ChunkKind::CallParameterName:
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case CodeCompletionString::Chunk::ChunkKind::CallParameterInternalName:
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case CodeCompletionString::Chunk::ChunkKind::CallParameterColon:
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case CodeCompletionString::Chunk::ChunkKind::DeclAttrParamKeyword:
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case CodeCompletionString::Chunk::ChunkKind::DeclAttrParamEqual:
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case CodeCompletionString::Chunk::ChunkKind::CallParameterType:
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case CodeCompletionString::Chunk::ChunkKind::CallParameterClosureType:
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case CodeCompletionString::Chunk::ChunkKind::OptionalBegin:
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case CodeCompletionString::Chunk::ChunkKind::CallParameterBegin:
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case CodeCompletionString::Chunk::ChunkKind::GenericParameterBegin:
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case CodeCompletionString::Chunk::ChunkKind::GenericParameterName:
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case CodeCompletionString::Chunk::ChunkKind::TypeAnnotation:
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return Str;
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case CodeCompletionString::Chunk::ChunkKind::BraceStmtWithCursor:
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Str += " {";
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break;
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}
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}
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return Str;
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}
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static void toDisplayString(CodeCompletionResult *Result,
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llvm::raw_ostream &OS) {
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std::string Str;
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for (auto C : Result->getCompletionString()->getChunks()) {
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if (C.getKind() ==
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CodeCompletionString::Chunk::ChunkKind::BraceStmtWithCursor) {
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OS << ' ';
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continue;
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}
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if (!C.isAnnotation() && C.hasText()) {
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OS << C.getText();
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continue;
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}
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if (C.getKind() == CodeCompletionString::Chunk::ChunkKind::TypeAnnotation) {
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if (Result->getKind() == CodeCompletionResult::Declaration) {
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switch (Result->getAssociatedDeclKind()) {
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case CodeCompletionDeclKind::Class:
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case CodeCompletionDeclKind::Struct:
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case CodeCompletionDeclKind::Enum:
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continue;
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case CodeCompletionDeclKind::EnumElement:
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OS << ": ";
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break;
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case CodeCompletionDeclKind::Protocol:
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case CodeCompletionDeclKind::TypeAlias:
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case CodeCompletionDeclKind::GenericTypeParam:
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case CodeCompletionDeclKind::Constructor:
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case CodeCompletionDeclKind::Destructor:
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continue;
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case CodeCompletionDeclKind::Subscript:
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case CodeCompletionDeclKind::StaticMethod:
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case CodeCompletionDeclKind::InstanceMethod:
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case CodeCompletionDeclKind::OperatorFunction:
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case CodeCompletionDeclKind::FreeFunction:
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OS << " -> ";
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break;
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case CodeCompletionDeclKind::StaticVar:
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case CodeCompletionDeclKind::InstanceVar:
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case CodeCompletionDeclKind::LocalVar:
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case CodeCompletionDeclKind::GlobalVar:
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OS << ": ";
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break;
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}
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} else {
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OS << ": ";
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}
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OS << C.getText();
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}
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}
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}
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namespace swift {
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class REPLCodeCompletionConsumer : public SimpleCachingCodeCompletionConsumer {
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REPLCompletions &Completions;
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public:
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REPLCodeCompletionConsumer(REPLCompletions &Completions)
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: Completions(Completions) {}
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void handleResults(MutableArrayRef<CodeCompletionResult *> Results) override {
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CodeCompletionContext::sortCompletionResults(Results);
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for (auto Result : Results) {
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std::string InsertableString = toInsertableString(Result);
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if (StringRef(InsertableString).startswith(Completions.Prefix)) {
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llvm::SmallString<128> PrintedResult;
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{
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llvm::raw_svector_ostream OS(PrintedResult);
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toDisplayString(Result, OS);
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}
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Completions.CompletionStrings.push_back(
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Completions.CompletionContext.copyString(PrintedResult));
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InsertableString = InsertableString.substr(Completions.Prefix.size());
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Completions.CookedResults.push_back(
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{ Completions.CompletionContext.copyString(InsertableString),
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Result->getNumBytesToErase() });
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}
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}
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}
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};
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} // namespace swift
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REPLCompletions::REPLCompletions()
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: State(CompletionState::Invalid), CompletionContext(CompletionCache) {
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// Create a CodeCompletionConsumer.
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Consumer.reset(new REPLCodeCompletionConsumer(*this));
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// Cerate a factory for code completion callbacks that will feed the
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// Consumer.
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CompletionCallbacksFactory.reset(
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ide::makeCodeCompletionCallbacksFactory(CompletionContext,
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*Consumer.get()));
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}
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static void
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doCodeCompletion(SourceFile &SF, StringRef EnteredCode, unsigned *BufferID,
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CodeCompletionCallbacksFactory *CompletionCallbacksFactory) {
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// Temporarily disable printing the diagnostics.
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ASTContext &Ctx = SF.getASTContext();
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auto DiagnosticConsumers = Ctx.Diags.takeConsumers();
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std::string AugmentedCode = EnteredCode.str();
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AugmentedCode += '\0';
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*BufferID = Ctx.SourceMgr.addMemBufferCopy(AugmentedCode, "<REPL Input>");
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const unsigned CodeCompletionOffset = AugmentedCode.size() - 1;
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Ctx.SourceMgr.setCodeCompletionPoint(*BufferID, CodeCompletionOffset);
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// Parse, typecheck and temporarily insert the incomplete code into the AST.
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const unsigned OriginalDeclCount = SF.Decls.size();
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unsigned CurElem = OriginalDeclCount;
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PersistentParserState PersistentState;
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std::unique_ptr<DelayedParsingCallbacks> DelayedCB(
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new CodeCompleteDelayedCallbacks(Ctx.SourceMgr.getCodeCompletionLoc()));
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bool Done;
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do {
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parseIntoSourceFile(SF, *BufferID, &Done, nullptr, &PersistentState,
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DelayedCB.get());
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performTypeChecking(SF, PersistentState.getTopLevelContext(), None,
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CurElem);
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CurElem = SF.Decls.size();
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} while (!Done);
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performDelayedParsing(&SF, PersistentState, CompletionCallbacksFactory);
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// Now we are done with code completion. Remove the declarations we
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// temporarily inserted.
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SF.Decls.resize(OriginalDeclCount);
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// Add the diagnostic consumers back.
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for (auto DC : DiagnosticConsumers)
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Ctx.Diags.addConsumer(*DC);
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Ctx.Diags.resetHadAnyError();
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}
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void REPLCompletions::populate(SourceFile &SF, StringRef EnteredCode) {
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Prefix = "";
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Root.reset();
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CurrentCompletionIdx = ~size_t(0);
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CompletionStrings.clear();
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CookedResults.clear();
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assert(SF.Kind == SourceFileKind::REPL && "Can't append to a non-REPL file");
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unsigned BufferID;
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doCodeCompletion(SF, EnteredCode, &BufferID,
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CompletionCallbacksFactory.get());
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ASTContext &Ctx = SF.getASTContext();
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std::vector<Token> Tokens = tokenize(Ctx.LangOpts, Ctx.SourceMgr, BufferID);
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if (!Tokens.empty() && Tokens.back().is(tok::code_complete))
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Tokens.pop_back();
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if (!Tokens.empty()) {
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Token &LastToken = Tokens.back();
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if (LastToken.is(tok::identifier) || LastToken.isKeyword()) {
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Prefix = LastToken.getText();
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unsigned Offset = Ctx.SourceMgr.getLocOffsetInBuffer(LastToken.getLoc(),
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BufferID);
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doCodeCompletion(SF, EnteredCode.substr(0, Offset),
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&BufferID, CompletionCallbacksFactory.get());
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}
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}
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if (CookedResults.empty())
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State = CompletionState::Empty;
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else if (CookedResults.size() == 1)
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State = CompletionState::Unique;
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else
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State = CompletionState::CompletedRoot;
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}
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StringRef REPLCompletions::getRoot() const {
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if (Root)
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return Root.getValue();
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if (CookedResults.empty()) {
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Root = std::string();
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return Root.getValue();
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}
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std::string RootStr = CookedResults[0].InsertableString;
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for (auto R : CookedResults) {
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if (R.NumBytesToErase != 0) {
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RootStr.resize(0);
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break;
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}
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auto MismatchPlace = std::mismatch(RootStr.begin(), RootStr.end(),
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R.InsertableString.begin());
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RootStr.resize(MismatchPlace.first - RootStr.begin());
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}
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Root = RootStr;
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return Root.getValue();
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}
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REPLCompletions::CookedResult REPLCompletions::getPreviousStem() const {
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if (CurrentCompletionIdx == ~size_t(0) || CookedResults.empty())
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return {};
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const auto &Result = CookedResults[CurrentCompletionIdx];
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return { Result.InsertableString.substr(getRoot().size()),
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Result.NumBytesToErase };
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}
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REPLCompletions::CookedResult REPLCompletions::getNextStem() {
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if (CookedResults.empty())
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return {};
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CurrentCompletionIdx++;
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if (CurrentCompletionIdx >= CookedResults.size())
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CurrentCompletionIdx = 0;
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const auto &Result = CookedResults[CurrentCompletionIdx];
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return { Result.InsertableString.substr(getRoot().size()),
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Result.NumBytesToErase };
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}
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void REPLCompletions::reset() { State = CompletionState::Invalid; }
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