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//===-- Core/IncludeExcludeInfo.cpp - IncludeExclude class impl -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief This file provides the implementation of the IncludeExcludeInfo class
/// to handle the include and exclude command line options.
///
//===----------------------------------------------------------------------===//
#include "IncludeExcludeInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using std::error_code;
/// A string type to represent paths.
typedef SmallString<64> PathString;
namespace {
/// \brief Helper function to determine whether a file has the same path
/// prefix as \a Path.
///
/// \a Path must be an absolute path.
bool fileHasPathPrefix(StringRef File, StringRef Path) {
// Converts File to its absolute path.
PathString AbsoluteFile = File;
sys::fs::make_absolute(AbsoluteFile);
// Convert path strings to sys::path to iterate over each of its directories.
sys::path::const_iterator FileI = sys::path::begin(AbsoluteFile),
FileE = sys::path::end(AbsoluteFile),
PathI = sys::path::begin(Path),
PathE = sys::path::end(Path);
while (FileI != FileE && PathI != PathE) {
// If the strings aren't equal then the two paths aren't contained within
// each other.
bool IsSeparator = ((FileI->size() == 1) && (PathI->size() == 1) &&
sys::path::is_separator((*FileI)[0]) &&
sys::path::is_separator((*PathI)[0]));
if (!FileI->equals(*PathI) && !IsSeparator)
return false;
++FileI;
++PathI;
}
return true;
}
/// \brief Helper function for removing relative operators from a given
/// path i.e. "..", ".".
/// \a Path must be a absolute path.
std::string removeRelativeOperators(StringRef Path) {
sys::path::const_iterator PathI = sys::path::begin(Path);
sys::path::const_iterator PathE = sys::path::end(Path);
SmallVector<StringRef, 16> PathT;
while (PathI != PathE) {
if (PathI->equals("..")) {
// Test if we have reached the root then Path is invalid.
if (PathT.empty())
return "";
PathT.pop_back();
} else if (!PathI->equals("."))
PathT.push_back(*PathI);
++PathI;
}
// Rebuild the new path.
PathString NewPath;
for (SmallVectorImpl<StringRef>::iterator I = PathT.begin(), E = PathT.end();
I != E; ++I) {
llvm::sys::path::append(NewPath, *I);
}
return NewPath.str();
}
/// \brief Helper function to tokenize a string of paths and populate
/// the vector.
error_code parseCLInput(StringRef Line, std::vector<std::string> &List,
StringRef Separator) {
SmallVector<StringRef, 32> Tokens;
Line.split(Tokens, Separator, /*MaxSplit=*/ -1, /*KeepEmpty=*/ false);
for (SmallVectorImpl<StringRef>::iterator I = Tokens.begin(),
E = Tokens.end();
I != E; ++I) {
// Convert each path to its absolute path.
PathString Path = I->rtrim();
if (error_code Err = sys::fs::make_absolute(Path))
return Err;
// Remove relative operators from the path.
std::string AbsPath = removeRelativeOperators(Path);
// Add only non-empty paths to the list.
if (!AbsPath.empty())
List.push_back(AbsPath);
else
llvm::errs() << "Unable to parse input path: " << *I << "\n";
llvm::errs() << "Parse: " <<List.back() << "\n";
}
return error_code();
}
} // end anonymous namespace
error_code IncludeExcludeInfo::readListFromString(StringRef IncludeString,
StringRef ExcludeString) {
if (error_code Err = parseCLInput(IncludeString, IncludeList,
/*Separator=*/ ","))
return Err;
if (error_code Err = parseCLInput(ExcludeString, ExcludeList,
/*Separator=*/ ","))
return Err;
return error_code();
}
error_code IncludeExcludeInfo::readListFromFile(StringRef IncludeListFile,
StringRef ExcludeListFile) {
if (!IncludeListFile.empty()) {
std::unique_ptr<MemoryBuffer> FileBuf;
if (error_code Err = MemoryBuffer::getFile(IncludeListFile, FileBuf)) {
errs() << "Unable to read from include file.\n";
return Err;
}
if (error_code Err = parseCLInput(FileBuf->getBuffer(), IncludeList,
/*Separator=*/ "\n"))
return Err;
}
if (!ExcludeListFile.empty()) {
std::unique_ptr<MemoryBuffer> FileBuf;
if (error_code Err = MemoryBuffer::getFile(ExcludeListFile, FileBuf)) {
errs() << "Unable to read from exclude file.\n";
return Err;
}
if (error_code Err = parseCLInput(FileBuf->getBuffer(), ExcludeList,
/*Separator=*/ "\n"))
return Err;
}
return error_code();
}
bool IncludeExcludeInfo::isFileIncluded(StringRef FilePath) const {
bool InIncludeList = false;
for (std::vector<std::string>::const_iterator I = IncludeList.begin(),
E = IncludeList.end();
I != E; ++I)
if ((InIncludeList = fileHasPathPrefix(FilePath, *I)))
break;
// If file is not in the list of included paths then it is not necessary
// to check the excluded path list.
if (!InIncludeList)
return false;
// If the file is in the included list but not is not explicitly excluded,
// then it is safe to transform.
return !isFileExplicitlyExcluded(FilePath);
}
bool IncludeExcludeInfo::isFileExplicitlyExcluded(StringRef FilePath) const {
for (std::vector<std::string>::const_iterator I = ExcludeList.begin(),
E = ExcludeList.end();
I != E; ++I)
if (fileHasPathPrefix(FilePath, *I))
return true;
return false;
}
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