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/* Parsing driver.
Copyright (C) 2025 Free Software Foundation, Inc.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "elna/frontend/driver.h"
namespace elna::frontend
{
position make_position(const yy::location& location)
{
position result;
result.line = static_cast<std::size_t>(location.begin.line);
result.column = static_cast<std::size_t>(location.begin.column);
return result;
}
syntax_error::syntax_error(const std::string& message,
const char *input_file, const yy::location& location)
: error(input_file, make_position(location)), message(message)
{
}
std::string syntax_error::what() const
{
return message;
}
driver::driver(const char *input_file)
: error_container(input_file)
{
}
char escape_char(char escape)
{
switch (escape)
{
case 'n':
return '\n';
case 'a':
return '\a';
case 'b':
return '\b';
case 't':
return '\t';
case 'f':
return '\f';
case 'r':
return '\r';
case 'v':
return '\v';
case '\\':
return '\\';
case '\'':
return '\'';
case '"':
return '"';
case '?':
return '\?';
case '0':
return '\0';
default:
return escape_invalid_char;
}
}
std::optional<std::string> escape_string(const char *escape)
{
std::string result;
const char *current_position = escape + 1;
while (*current_position != '\0')
{
if (*current_position == '\\' && *(current_position + 1) == 'x')
{
current_position += 2;
std::size_t processed;
char character = static_cast<char>(std::stoi(current_position, &processed, 16));
if (processed == 0)
{
return std::nullopt;
}
else
{
current_position += processed - 1;
result.push_back(character);
}
}
else if (*current_position == '\\')
{
++current_position;
char escape = escape_char(*current_position);
if (escape == escape_invalid_char)
{
return std::nullopt;
}
result.push_back(escape);
}
else
{
result.push_back(*current_position);
}
++current_position;
}
result.pop_back(); // Remove the terminating quote character.
return result;
}
}
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