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//===--- CommandLineSourceLoc.h - Parsing for source locations-*- 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
//
//===----------------------------------------------------------------------===//
//
// Command line parsing for source locations.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_FRONTEND_COMMANDLINESOURCELOC_H
#define LLVM_CLANG_FRONTEND_COMMANDLINESOURCELOC_H
#include "clang/Basic/LLVM.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include <optional>
namespace clang {
/// A source location that has been parsed on the command line.
struct ParsedSourceLocation {
std::string FileName;
unsigned Line;
unsigned Column;
public:
/// Construct a parsed source location from a string; the Filename is empty on
/// error.
static ParsedSourceLocation FromString(StringRef Str) {
ParsedSourceLocation PSL;
std::pair<StringRef, StringRef> ColSplit = Str.rsplit(':');
std::pair<StringRef, StringRef> LineSplit =
ColSplit.first.rsplit(':');
// If both tail splits were valid integers, return success.
if (!ColSplit.second.getAsInteger(10, PSL.Column) &&
!LineSplit.second.getAsInteger(10, PSL.Line)) {
PSL.FileName = std::string(LineSplit.first);
// On the command-line, stdin may be specified via "-". Inside the
// compiler, stdin is called "<stdin>".
if (PSL.FileName == "-")
PSL.FileName = "<stdin>";
}
return PSL;
}
/// Serialize ParsedSourceLocation back to a string.
std::string ToString() const {
return (llvm::Twine(FileName == "<stdin>" ? "-" : FileName) + ":" +
Twine(Line) + ":" + Twine(Column))
.str();
}
};
/// A source range that has been parsed on the command line.
struct ParsedSourceRange {
std::string FileName;
/// The starting location of the range. The first element is the line and
/// the second element is the column.
std::pair<unsigned, unsigned> Begin;
/// The ending location of the range. The first element is the line and the
/// second element is the column.
std::pair<unsigned, unsigned> End;
/// Returns a parsed source range from a string or std::nullopt if the string
/// is invalid.
///
/// These source string has the following format:
///
/// file:start_line:start_column[-end_line:end_column]
///
/// If the end line and column are omitted, the starting line and columns
/// are used as the end values.
static std::optional<ParsedSourceRange> fromString(StringRef Str) {
std::pair<StringRef, StringRef> RangeSplit = Str.rsplit('-');
unsigned EndLine, EndColumn;
bool HasEndLoc = false;
if (!RangeSplit.second.empty()) {
std::pair<StringRef, StringRef> Split = RangeSplit.second.rsplit(':');
if (Split.first.getAsInteger(10, EndLine) ||
Split.second.getAsInteger(10, EndColumn)) {
// The string does not end in end_line:end_column, so the '-'
// probably belongs to the filename which menas the whole
// string should be parsed.
RangeSplit.first = Str;
} else
HasEndLoc = true;
}
auto Begin = ParsedSourceLocation::FromString(RangeSplit.first);
if (Begin.FileName.empty())
return std::nullopt;
if (!HasEndLoc) {
EndLine = Begin.Line;
EndColumn = Begin.Column;
}
return ParsedSourceRange{std::move(Begin.FileName),
{Begin.Line, Begin.Column},
{EndLine, EndColumn}};
}
};
}
namespace llvm {
namespace cl {
/// Command-line option parser that parses source locations.
///
/// Source locations are of the form filename:line:column.
template<>
class parser<clang::ParsedSourceLocation> final
: public basic_parser<clang::ParsedSourceLocation> {
public:
inline bool parse(Option &O, StringRef ArgName, StringRef ArgValue,
clang::ParsedSourceLocation &Val);
};
bool
parser<clang::ParsedSourceLocation>::
parse(Option &O, StringRef ArgName, StringRef ArgValue,
clang::ParsedSourceLocation &Val) {
using namespace clang;
Val = ParsedSourceLocation::FromString(ArgValue);
if (Val.FileName.empty()) {
errs() << "error: "
<< "source location must be of the form filename:line:column\n";
return true;
}
return false;
}
}
}
#endif
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