CMake/Source/cmProcessTools.h

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
2016-09-27 19:01:08 +00:00
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmProcessTools_h
#define cmProcessTools_h
#include "cmConfigure.h" // IWYU pragma: keep
#include "cmProcessOutput.h"
#include <iosfwd>
#include <string.h>
#include <string>
/** \class cmProcessTools
* \brief Helper classes for process output parsing
*
*/
class cmProcessTools
{
public:
typedef cmProcessOutput::Encoding Encoding;
/** Abstract interface for process output parsers. */
class OutputParser
{
public:
/** Process the given output data from a tool. Processing may be
done incrementally. Returns true if the parser is interested
in any more data and false if it is done. */
bool Process(const char* data, int length)
{
return this->ProcessChunk(data, length);
}
bool Process(const char* data)
{
return this->Process(data, static_cast<int>(strlen(data)));
}
virtual ~OutputParser() = default;
protected:
/** Implement in a subclass to process a chunk of data. It should
return true only if it is interested in more data. */
virtual bool ProcessChunk(const char* data, int length) = 0;
};
/** Process output parser that extracts one line at a time. */
class LineParser : public OutputParser
{
public:
/** Construct with line separation character and choose whether to
ignore carriage returns. */
LineParser(char sep = '\n', bool ignoreCR = true);
/** Configure logging of lines as they are extracted. */
void SetLog(std::ostream* log, const char* prefix);
protected:
std::ostream* Log = nullptr;
const char* Prefix = nullptr;
std::string Line;
char Separator;
char LineEnd = '\0';
bool IgnoreCR;
bool ProcessChunk(const char* data, int length) override;
/** Implement in a subclass to process one line of input. It
should return true only if it is interested in more data. */
virtual bool ProcessLine() = 0;
};
/** Trivial line handler for simple logging. */
class OutputLogger : public LineParser
{
public:
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OutputLogger(std::ostream& log, const char* prefix = nullptr)
{
this->SetLog(&log, prefix);
}
private:
bool ProcessLine() override { return true; }
};
/** Run a process and send output to given parsers. */
static void RunProcess(struct cmsysProcess_s* cp, OutputParser* out,
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OutputParser* err = nullptr,
Encoding encoding = cmProcessOutput::Auto);
};
#endif