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//===--- SemanticHighlighting.cpp - ------------------------- ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "SemanticHighlighting.h"
#include "Logger.h"
#include "Protocol.h"
#include "SourceCode.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecursiveASTVisitor.h"
namespace clang {
namespace clangd {
namespace {
// Collects all semantic tokens in an ASTContext.
class HighlightingTokenCollector
: public RecursiveASTVisitor<HighlightingTokenCollector> {
std::vector<HighlightingToken> Tokens;
ASTContext &Ctx;
const SourceManager &SM;
public:
HighlightingTokenCollector(ParsedAST &AST)
: Ctx(AST.getASTContext()), SM(AST.getSourceManager()) {}
std::vector<HighlightingToken> collectTokens() {
Tokens.clear();
TraverseAST(Ctx);
return Tokens;
}
bool VisitVarDecl(VarDecl *Var) {
addToken(Var, HighlightingKind::Variable);
return true;
}
bool VisitFunctionDecl(FunctionDecl *Func) {
addToken(Func, HighlightingKind::Function);
return true;
}
private:
void addToken(const NamedDecl *D, HighlightingKind Kind) {
if (D->getLocation().isMacroID())
// FIXME: skip tokens inside macros for now.
return;
if (D->getDeclName().isEmpty())
// Don't add symbols that don't have any length.
return;
auto R = getTokenRange(SM, Ctx.getLangOpts(), D->getLocation());
if (!R) {
// R should always have a value, if it doesn't something is very wrong.
elog("Tried to add semantic token with an invalid range");
return;
}
Tokens.push_back({Kind, R.getValue()});
}
};
// Encode binary data into base64.
// This was copied from compiler-rt/lib/fuzzer/FuzzerUtil.cpp.
// FIXME: Factor this out into llvm/Support?
std::string encodeBase64(const llvm::SmallVectorImpl<char> &Bytes) {
static const char Table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
std::string Res;
size_t I;
for (I = 0; I + 2 < Bytes.size(); I += 3) {
uint32_t X = (Bytes[I] << 16) + (Bytes[I + 1] << 8) + Bytes[I + 2];
Res += Table[(X >> 18) & 63];
Res += Table[(X >> 12) & 63];
Res += Table[(X >> 6) & 63];
Res += Table[X & 63];
}
if (I + 1 == Bytes.size()) {
uint32_t X = (Bytes[I] << 16);
Res += Table[(X >> 18) & 63];
Res += Table[(X >> 12) & 63];
Res += "==";
} else if (I + 2 == Bytes.size()) {
uint32_t X = (Bytes[I] << 16) + (Bytes[I + 1] << 8);
Res += Table[(X >> 18) & 63];
Res += Table[(X >> 12) & 63];
Res += Table[(X >> 6) & 63];
Res += "=";
}
return Res;
}
void write32be(uint32_t I, llvm::raw_ostream &OS) {
std::array<char, 4> Buf;
llvm::support::endian::write32be(Buf.data(), I);
OS.write(Buf.data(), Buf.size());
}
void write16be(uint16_t I, llvm::raw_ostream &OS) {
std::array<char, 2> Buf;
llvm::support::endian::write16be(Buf.data(), I);
OS.write(Buf.data(), Buf.size());
}
} // namespace
bool operator==(const HighlightingToken &Lhs, const HighlightingToken &Rhs) {
return Lhs.Kind == Rhs.Kind && Lhs.R == Rhs.R;
}
std::vector<HighlightingToken> getSemanticHighlightings(ParsedAST &AST) {
return HighlightingTokenCollector(AST).collectTokens();
}
std::vector<SemanticHighlightingInformation>
toSemanticHighlightingInformation(llvm::ArrayRef<HighlightingToken> Tokens) {
if (Tokens.size() == 0)
return {};
// FIXME: Tokens might be multiple lines long (block comments) in this case
// this needs to add multiple lines for those tokens.
std::map<int, std::vector<HighlightingToken>> TokenLines;
for (const HighlightingToken &Token : Tokens)
TokenLines[Token.R.start.line].push_back(Token);
std::vector<SemanticHighlightingInformation> Lines;
Lines.reserve(TokenLines.size());
for (const auto &Line : TokenLines) {
llvm::SmallVector<char, 128> LineByteTokens;
llvm::raw_svector_ostream OS(LineByteTokens);
for (const auto &Token : Line.second) {
// Writes the token to LineByteTokens in the byte format specified by the
// LSP proposal. Described below.
// |<---- 4 bytes ---->|<-- 2 bytes -->|<--- 2 bytes -->|
// | character | length | index |
write32be(Token.R.start.character, OS);
write16be(Token.R.end.character - Token.R.start.character, OS);
write16be(static_cast<int>(Token.Kind), OS);
}
Lines.push_back({Line.first, encodeBase64(LineByteTokens)});
}
return Lines;
}
llvm::StringRef toTextMateScope(HighlightingKind Kind) {
// FIXME: Add scopes for C and Objective C.
switch (Kind) {
case HighlightingKind::Function:
return "entity.name.function.cpp";
case HighlightingKind::Variable:
return "variable.cpp";
case HighlightingKind::NumKinds:
llvm_unreachable("must not pass NumKinds to the function");
}
llvm_unreachable("unhandled HighlightingKind");
}
} // namespace clangd
} // namespace clang
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