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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 cmFilePathChecksum_h
#define cmFilePathChecksum_h
#include "cmConfigure.h" // IWYU pragma: keep
#include <array>
#include <cstddef>
#include <string>
#include <utility>
class cmMakefile;
/** \class cmFilePathChecksum
* @brief Generates a checksum for the parent directory of a file
*
* 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 cmFilePathChecksum
{
public:
/// Maximum number of characters to use from the path checksum
static const size_t partLengthDefault = 10;
/// @brief Parent directories are empty
cmFilePathChecksum();
/// @brief Initializes the parent directories manually
cmFilePathChecksum(std::string const& currentSrcDir,
std::string const& currentBinDir,
std::string const& projectSrcDir,
std::string const& projectBinDir);
/// @brief Initializes the parent directories from a makefile
cmFilePathChecksum(cmMakefile* makefile);
/// @brief Allows parent directories setup after construction
///
void setupParentDirs(std::string const& currentSrcDir,
std::string const& currentBinDir,
std::string const& projectSrcDir,
std::string const& projectBinDir);
/* @brief Calculates the path checksum for the parent directory of a file
*
*/
std::string get(std::string const& filePath) const;
/* @brief Same as get() but returns only the first length characters
*
*/
std::string getPart(std::string const& filePath,
size_t length = partLengthDefault) const;
private:
/// List of (directory name, seed name) pairs
std::array<std::pair<std::string, std::string>, 4> parentDirs;
};
#endif
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