format: implement generic format parser and printer
This commit is contained in:
Andrzej Rybczak
209
src/format.cpp
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209
src/format.cpp
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/***************************************************************************
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* Copyright (C) 2008-2014 by Andrzej Rybczak *
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* electricityispower@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#include <stdexcept>
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#include "format.h"
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#include "utility/type_conversions.h"
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namespace {
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template <typename CharT> using string = std::basic_string<CharT>;
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template <typename CharT> using iterator = typename std::basic_string<CharT>::const_iterator;
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template <typename CharT> using expressions = std::vector<Format::Expression<CharT>>;
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std::string invalidCharacter(char c)
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{
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return "invalid character '" + boost::lexical_cast<std::string>(c) + "'";
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}
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template <typename CharT>
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void throwError(const string<CharT> &s, iterator<CharT> current, std::string msg)
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{
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throw std::runtime_error(
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std::move(msg) + " at position " + boost::lexical_cast<std::string>(current - s.begin())
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);
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}
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template <typename CharT>
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void rangeCheck(const string<CharT> &s, iterator<CharT> current, iterator<CharT> end)
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{
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if (current >= end)
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throwError(s, current, "unexpected end");
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}
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template <typename CharT>
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expressions<CharT> parseBracket(const string<CharT> &s,
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iterator<CharT> it, iterator<CharT> end)
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{
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string<CharT> token;
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expressions<CharT> tmp, result;
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auto push_token = [&] {
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result.push_back(std::move(token));
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};
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for (; it != end; ++it)
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{
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if (*it == '{')
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{
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push_token();
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bool done;
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Format::Any<CharT> any;
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do
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{
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auto jt = it;
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done = true;
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// get to the corresponding closing bracket
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unsigned brackets = 1;
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while (brackets > 0)
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{
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if (++jt == end)
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break;
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if (*jt == '{')
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++brackets;
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else if (*jt == '}')
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--brackets;
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}
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// check if we're still in range
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rangeCheck(s, jt, end);
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// skip the opening bracket
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++it;
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// recursively parse the bracket
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tmp = parseBracket(s, it, jt);
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// if the inner bracket contains only one expression,
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// put it as is. otherwise require all of them.
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if (tmp.size() == 1)
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any.base().push_back(std::move(tmp[0]));
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else
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any.base().push_back(Format::All<CharT>(std::move(tmp)));
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it = jt;
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// check for the alternative
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++jt;
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if (jt != end && *jt == '|')
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{
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++jt;
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rangeCheck(s, jt, end);
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if (*jt != '{')
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throwError(s, jt, invalidCharacter(*jt) + ", expected '{'");
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it = jt;
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done = false;
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}
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}
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while (!done);
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assert(!any.base().empty());
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// if there was only one bracket, append empty branch
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// so that it always evaluates to true. otherwise put
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// it as is.
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if (any.base().size() == 1)
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any.base().push_back(string<CharT>());
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result.push_back(std::move(any));
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}
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else if (*it == '%')
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{
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++it;
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rangeCheck(s, it, end);
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// %% is escaped %
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if (*it == '%')
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{
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token += '%';
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continue;
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}
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push_token();
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// check for tag delimiter
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unsigned delimiter = 0;
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if (isdigit(*it))
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{
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std::string sdelimiter;
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do
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sdelimiter += *it++;
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while (it != end && isdigit(*it));
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rangeCheck(s, it, end);
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delimiter = boost::lexical_cast<unsigned>(sdelimiter);
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}
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auto f = charToGetFunction(*it);
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if (f == nullptr)
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throwError(s, it, invalidCharacter(*it));
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result.push_back(Format::SongTag(f, delimiter));
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}
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else if (*it == '$')
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{
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++it;
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rangeCheck(s, it, end);
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// $$ is escaped $
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if (*it == '$')
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{
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token += '$';
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continue;
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}
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push_token();
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if (isdigit(*it))
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{
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auto color = charToColor(*it);
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result.push_back(color);
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}
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else if (*it == 'R')
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result.push_back(Format::AlignRight());
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else if (*it == 'b')
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result.push_back(NC::Format::Bold);
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else if (*it == 'u')
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result.push_back(NC::Format::Underline);
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else if (*it == 'a')
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result.push_back(NC::Format::AltCharset);
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else if (*it == 'r')
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result.push_back(NC::Format::Reverse);
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else if (*it == '/')
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{
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++it;
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rangeCheck(s, it, end);
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if (*it == 'b')
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result.push_back(NC::Format::NoBold);
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else if (*it == 'u')
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result.push_back(NC::Format::NoUnderline);
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else if (*it == 'a')
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result.push_back(NC::Format::NoAltCharset);
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else if (*it == 'r')
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result.push_back(NC::Format::NoReverse);
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else
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throwError(s, it, invalidCharacter(*it));
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}
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else
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throwError(s, it, invalidCharacter(*it));
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}
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else
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token += *it;
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}
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push_token();
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return result;
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}
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}
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namespace Format {
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AST<char> parse(const std::string &s)
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{
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return AST<char>(parseBracket(s, s.begin(), s.end()));
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}
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AST<wchar_t> wparse(const std::wstring &s)
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{
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return AST<wchar_t>(parseBracket(s, s.begin(), s.end()));
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}
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}
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