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/**
* \file
* \author Guillaume Papin <guillaume.papin@epitech.eu>
*
* This file is distributed under the GNU General Public License. See
* COPYING for details.
*/
#include "CommandLineParser.h"
namespace {
/// \brief A parser for escaped strings of command line arguments.
///
/// Assumes \-escaping for quoted arguments (see the documentation of
/// unescapeCommandLine(...)).
class CommandLineArgumentParser {
public:
CommandLineArgumentParser(const std::string &commandLine)
: input_(commandLine), position_(input_.begin() - 1) {
}
std::vector<std::string> parse() {
bool hasMoreInput = true;
while (hasMoreInput && nextNonWhitespace()) {
std::string argument;
hasMoreInput = parseStringInto(argument);
commandLine_.push_back(argument);
}
return commandLine_;
}
private:
// All private methods return true if there is more input available.
bool parseStringInto(std::string &string) {
do {
if (*position_ == '"') {
if (!parseDoubleQuotedStringInto(string))
return false;
} else if (*position_ == '\'') {
if (!parseSingleQuotedStringInto(string))
return false;
} else {
if (!parseFreeStringInto(string))
return false;
}
} while (*position_ != ' ');
return true;
}
bool parseDoubleQuotedStringInto(std::string &string) {
if (!next())
return false;
while (*position_ != '"') {
if (!skipEscapeCharacter())
return false;
string.push_back(*position_);
if (!next())
return false;
}
return next();
}
bool parseSingleQuotedStringInto(std::string &string) {
if (!next())
return false;
while (*position_ != '\'') {
string.push_back(*position_);
if (!next())
return false;
}
return next();
}
bool parseFreeStringInto(std::string &string) {
do {
if (!skipEscapeCharacter())
return false;
string.push_back(*position_);
if (!next())
return false;
} while (*position_ != ' ' && *position_ != '"' && *position_ != '\'');
return true;
}
bool skipEscapeCharacter() {
if (*position_ == '\\') {
return next();
}
return true;
}
bool nextNonWhitespace() {
do {
if (!next())
return false;
} while (*position_ == ' ');
return true;
}
bool next() {
++position_;
return position_ != input_.end();
}
private:
const std::string input_;
std::string::const_iterator position_;
std::vector<std::string> commandLine_;
};
} // unnamed namespace
std::vector<std::string>
unescapeCommandLine(const std::string &escapedCommandLine) {
CommandLineArgumentParser parser(escapedCommandLine);
return parser.parse();
}
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