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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmFilePathUuid_h
#define cmFilePathUuid_h
#include <cmConfigure.h> // IWYU pragma: keep
#include <stddef.h>
#include <string>
#include <utility>
class cmMakefile;
/** \class cmFilePathUuid
* @brief Generates a unique pathless file name with a checksum component
* calculated from the file path.
*
* The checksum is calculated from the relative file path to the
* closest known project directory. This guarantees reproducibility
* when source and build directory differ e.g. for different project
* build directories.
*/
class cmFilePathUuid
{
public:
/// Maximum number of characters to use from the file name
static const size_t partLengthName = 14;
/// Maximum number of characters to use from the path checksum
static const size_t partLengthCheckSum = 14;
/// @brief Initilizes the parent directories from a makefile
cmFilePathUuid(cmMakefile* makefile);
/// @brief Initilizes the parent directories manually
cmFilePathUuid(const std::string& currentSrcDir,
const std::string& currentBinDir,
const std::string& projectSrcDir,
const std::string& projectBinDir);
/* @brief Calculates and returns the uuid for a file path
*
* @arg outputPrefix optional string to prepend to the result
* @arg outputSuffix optional string to append to the result
*/
std::string get(const std::string& filePath,
const char* outputPrefix = CM_NULLPTR,
const char* outputSuffix = CM_NULLPTR);
private:
void initParentDirs(const std::string& currentSrcDir,
const std::string& currentBinDir,
const std::string& projectSrcDir,
const std::string& projectBinDir);
/// Returns the relative path and the parent directory key string (seed)
void GetRelPathSeed(const std::string& filePath, std::string& sourceRelPath,
std::string& sourceRelSeed);
std::string GetChecksumString(const std::string& sourceFilename,
const std::string& sourceRelPath,
const std::string& sourceRelSeed);
/// Size of the parent directory list
static const size_t numParentDirs = 4;
/// List of (directory name, seed name) pairs
std::pair<std::string, std::string> parentDirs[numParentDirs];
};
#endif
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