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244 lines (228 loc) · 7.15 KB
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/***************************************************************************
* Copyright (C) 2008-2021 by Andrzej Rybczak *
* *
* This program 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 2 of the License, or *
* (at your option) any later version. *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include <stdexcept>
#include "format_impl.h"
#include "utility/type_conversions.h"
namespace {
const unsigned properties = Format::Flags::Color
| Format::Flags::Format
| Format::Flags::OutputSwitch;
template <typename CharT> using string = std::basic_string<CharT>;
template <typename CharT> using iterator = typename std::basic_string<CharT>::const_iterator;
template <typename CharT> using expressions = std::vector<Format::Expression<CharT>>;
template <typename CharT>
std::string invalidCharacter(CharT c)
{
return "invalid character '"
+ convertString<char, CharT>::apply(boost::lexical_cast<string<CharT>>(c))
+ "'";
}
template <typename CharT>
void throwError(const string<CharT> &s, iterator<CharT> current, std::string msg)
{
throw std::runtime_error(
std::move(msg) + " at position " + boost::lexical_cast<std::string>(current - s.begin())
);
}
template <typename CharT>
void rangeCheck(const string<CharT> &s, iterator<CharT> current, iterator<CharT> end)
{
if (current >= end)
throwError(s, current, "unexpected end");
}
template <typename CharT>
expressions<CharT> parseBracket(const string<CharT> &s,
iterator<CharT> it, iterator<CharT> end,
const unsigned flags)
{
string<CharT> token;
expressions<CharT> tmp, result;
auto push_token = [&] {
if (!token.empty())
result.push_back(std::move(token));
};
int colors = 0;
for (; it != end; ++it)
{
if (*it == '{')
{
push_token();
bool done;
Format::FirstOf<CharT> first_of;
do
{
auto jt = it;
done = true;
// get to the corresponding closing bracket
unsigned brackets = 1;
while (brackets > 0)
{
if (++jt == end)
break;
if (*jt == '{')
++brackets;
else if (*jt == '}')
--brackets;
}
// check if we're still in range
rangeCheck(s, jt, end);
// skip the opening bracket
++it;
// recursively parse the bracket
tmp = parseBracket(s, it, jt, flags);
// if the inner bracket contains only one expression,
// put it as is. otherwise make a group out of them.
if (tmp.size() == 1)
first_of.base().push_back(std::move(tmp[0]));
else
first_of.base().push_back(Format::Group<CharT>(std::move(tmp)));
it = jt;
// check for the alternative
++jt;
if (jt != end && *jt == '|')
{
++jt;
rangeCheck(s, jt, end);
if (*jt != '{')
throwError(s, jt, invalidCharacter(*jt) + ", expected '{'");
it = jt;
done = false;
}
}
while (!done);
assert(!first_of.base().empty());
result.push_back(std::move(first_of));
}
else if (flags & Format::Flags::Tag && *it == '%')
{
++it;
rangeCheck(s, it, end);
// %% is escaped %
if (*it == '%')
{
token += '%';
continue;
}
push_token();
// check for tag delimiter
unsigned delimiter = 0;
if (isdigit(*it))
{
string<CharT> sdelimiter;
do
sdelimiter += *it++;
while (it != end && isdigit(*it));
rangeCheck(s, it, end);
delimiter = boost::lexical_cast<unsigned>(sdelimiter);
}
auto f = charToGetFunction(*it);
if (f == nullptr)
throwError(s, it, invalidCharacter(*it));
result.push_back(Format::SongTag(f, delimiter));
}
else if (flags & properties && *it == '$')
{
++it;
rangeCheck(s, it, end);
// $$ is escaped $
if (*it == '$')
{
token += '$';
continue;
}
push_token();
// legacy colors
if (flags & Format::Flags::Color && isdigit(*it))
{
auto color = charToColor(*it);
colors += color != NC::Color::End ? 1 : -1 * (colors > 0);
result.push_back(color);
}
// new colors
else if (flags & Format::Flags::Color && *it == '(')
{
++it;
rangeCheck(s, it, end);
auto jt = it;
string<CharT> scolor;
do
scolor += *it++;
while (it != end && *it != ')');
rangeCheck(s, it, end);
auto value = convertString<char, CharT>::apply(scolor);
try {
result.push_back(boost::lexical_cast<NC::Color>(value));
} catch (boost::bad_lexical_cast &) {
throwError(s, jt, "invalid color \"" + value + "\"");
}
}
// output switch
else if (flags & Format::Flags::OutputSwitch && *it == 'R')
result.push_back(Format::OutputSwitch());
// format
else if (flags & Format::Flags::Format && *it == 'b')
result.push_back(NC::Format::Bold);
else if (flags & Format::Flags::Format && *it == 'u')
result.push_back(NC::Format::Underline);
else if (flags & Format::Flags::Format && *it == 'a')
result.push_back(NC::Format::AltCharset);
else if (flags & Format::Flags::Format && *it == 'r')
result.push_back(NC::Format::Reverse);
else if (flags & Format::Flags::Format && *it == 'i')
result.push_back(NC::Format::Italic);
else if (flags & Format::Flags::Format && *it == '/')
{
++it;
rangeCheck(s, it, end);
if (*it == 'b')
result.push_back(NC::Format::NoBold);
else if (*it == 'u')
result.push_back(NC::Format::NoUnderline);
else if (*it == 'a')
result.push_back(NC::Format::NoAltCharset);
else if (*it == 'r')
result.push_back(NC::Format::NoReverse);
else if (*it == 'i')
result.push_back(NC::Format::NoItalic);
else
throwError(s, it, invalidCharacter(*it));
}
else
throwError(s, it, invalidCharacter(*it));
}
else
token += *it;
}
push_token();
for (; colors > 0; --colors)
result.push_back(NC::Color::End);
return result;
}
}
namespace Format {
AST<char> parse(const std::string &s, const unsigned flags)
{
return AST<char>(parseBracket(s, s.begin(), s.end(), flags));
}
AST<wchar_t> parse(const std::wstring &s, const unsigned flags)
{
return AST<wchar_t>(parseBracket(s, s.begin(), s.end(), flags));
}
}