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/* Copyright (C) 2015 Cotton Seed
This file is part of arachne-pnr. Arachne-pnr is free software;
you can redistribute it and/or modify it under the terms of the GNU
General Public License version 2 as published by the Free Software
Foundation.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include "line_parser.hh"
#include "util.hh"
std::ostream &
operator<<(std::ostream &s, const LexicalPosition &lp)
{
if (lp.internal)
s << "<internal>";
else
s << lp.file << ":" << lp.line;
return s;
}
void
LexicalPosition::fatal(const std::string &msg) const
{
std::cerr << *this << ": fatal error: " << msg << "\n";
exit(EXIT_FAILURE);
}
void
LexicalPosition::warning(const std::string &msg) const
{
std::cerr << *this << ": warning: " << msg << "\n";
}
void
LineParser::split_line()
{
words.clear();
std::string t;
bool instr = false,
quote = false;
for (char ch : line)
{
if (instr)
{
t.push_back(ch);
if (quote)
quote = false;
else if (ch == '\\')
quote = true;
else if (ch == '"')
{
words.push_back(unescape(t));
t.clear();
instr = false;
}
}
else if (isspace(ch))
{
if (!t.empty())
{
words.push_back(t);
t.clear();
}
}
else
{
t.push_back(ch);
if (ch == '"')
instr = true;
}
}
if (instr)
fatal("unterminated string constant");
else if (!t.empty())
{
words.push_back(t);
t.clear();
}
}
void
LineParser::read_line()
{
words.clear();
do {
line.clear();
if (s.eof())
return;
lp.next_line();
std::getline(s, line);
L:
std::size_t p = line.find('#');
if (p != std::string::npos)
line.resize(p);
else if (!line.empty()
&& line.back() == '\\')
{
if (s.eof())
fatal("unexpected backslash before eof");
// drop backslash
line.pop_back();
std::string line2;
lp.next_line();
std::getline(s, line2);
line.append(line2);
goto L;
}
split_line();
} while (words.empty());
}
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