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//===--- SourceCode.h - Manipulating source code as strings -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "SourceCode.h"
namespace clang {
namespace clangd {
using namespace llvm;
size_t positionToOffset(StringRef Code, Position P) {
if (P.line < 0)
return 0;
size_t StartOfLine = 0;
for (int I = 0; I != P.line; ++I) {
size_t NextNL = Code.find('\n', StartOfLine);
if (NextNL == StringRef::npos)
return Code.size();
StartOfLine = NextNL + 1;
}
// FIXME: officially P.character counts UTF-16 code units, not UTF-8 bytes!
return std::min(Code.size(), StartOfLine + std::max(0, P.character));
}
Position offsetToPosition(StringRef Code, size_t Offset) {
Offset = std::min(Code.size(), Offset);
StringRef Before = Code.substr(0, Offset);
int Lines = Before.count('\n');
size_t PrevNL = Before.rfind('\n');
size_t StartOfLine = (PrevNL == StringRef::npos) ? 0 : (PrevNL + 1);
// FIXME: officially character counts UTF-16 code units, not UTF-8 bytes!
return {Lines, static_cast<int>(Offset - StartOfLine)};
}
} // namespace clangd
} // namespace clang
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