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//-----------------------------------------------------------------------------
/** @file libboardgame_gtp/CmdLine.cpp
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#include "CmdLine.h"
#include <limits>
#include <sstream>
namespace libboardgame_gtp {
//-----------------------------------------------------------------------------
CmdLine::CmdLine(const string& line)
{
init(line);
}
CmdLine::~CmdLine() = default; // Non-inline to avoid GCC -Winline warning
void CmdLine::add_elem(string::const_iterator begin,
string::const_iterator end)
{
// Ignore command line elements greater UINT_MAX because we use unsigned
// for element indices.
if (m_elem.size() < numeric_limits<unsigned>::max())
m_elem.emplace_back(&*begin, end - begin);
}
/** Find elements (ID, command name, arguments).
Arguments are words separated by whitespaces.
Arguments with whitespaces can be quoted with quotation marks ('"').
Characters can be escaped with a backslash ('\'). */
void CmdLine::find_elem()
{
m_elem.clear();
bool escape = false;
bool is_in_string = false;
string::const_iterator begin = m_line.begin();
string::const_iterator i;
for (i = begin; i < m_line.end(); ++i)
{
char c = *i;
if (c == '"' && ! escape)
{
if (is_in_string)
add_elem(begin, i);
begin = i + 1;
is_in_string = ! is_in_string;
}
else if (isspace(static_cast<unsigned char>(c)) != 0 && ! is_in_string)
{
if (i > begin)
m_elem.emplace_back(&*begin, i - begin);
begin = i + 1;
}
escape = (c == '\\' && ! escape);
}
if (i > begin)
m_elem.emplace_back(&*begin, m_line.end() - begin);
}
string_view CmdLine::get_trimmed_line_after_elem(unsigned i) const
{
assert(i < m_elem.size());
auto& e = m_elem[i];
auto begin = &*e.end();
auto end = &*m_line.end();
if (begin < end && *begin == '"')
++begin;
while (begin < end && isspace(static_cast<unsigned char>(*begin)) != 0)
++begin;
while (end > begin && isspace(static_cast<unsigned char>(*(end - 1))) != 0)
--end;
return {begin, static_cast<string_view::size_type>(end - begin)};
}
void CmdLine::init(const string& line)
{
m_line = line;
find_elem();
assert(! m_elem.empty());
parse_id();
assert(! m_elem.empty());
}
void CmdLine::parse_id()
{
m_idx_name = 0;
if (m_elem.size() < 2)
return;
istringstream in(string(&*m_elem[0].begin(), m_elem[0].size()));
int id;
in >> id;
if (in)
m_idx_name = 1;
}
//-----------------------------------------------------------------------------
} // namespace libboardgame_gtp
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