9bef80fbef
Parse just a tiny subset of Markdown, to basically collapse multiple whitespace and do paragraphs only after two newlines. Also one-level, unordered lists are supported. The output can be eg. directly forwarded to canvas::Text.
105 lines
2.8 KiB
C++
105 lines
2.8 KiB
C++
// Really simple markdown parser
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//
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// Copyright (C) 2014 Thomas Geymayer <tomgey@gmail.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#include "SimpleMarkdown.hxx"
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namespace simgear
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{
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// White space
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static bool isSpace(const char c)
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{
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return c == ' ' || c == '\t';
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}
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// Unordered list item
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static bool isULItem(const char c)
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{
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return c == '*' || c == '+' || c == '-';
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}
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//----------------------------------------------------------------------------
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std::string SimpleMarkdown::parse(const std::string& src)
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{
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std::string out;
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int num_space = 0,
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num_newline = 0;
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bool line_empty = true;
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for( std::string::const_iterator it = src.begin();
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it != src.end();
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++it )
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{
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if( isSpace(*it) )
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{
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++num_space;
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}
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else if( *it == '\n' )
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{
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// Two or more whitespace at end of line -> line break
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if( !line_empty && num_space >= 2 )
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{
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out.push_back('\n');
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line_empty = true;
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}
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++num_newline;
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num_space = 0;
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}
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else
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{
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// Remove all new lines before first printable character
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if( out.empty() )
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num_newline = 0;
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// Two or more new lines (aka. at least one empty line) -> new paragraph
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if( num_newline >= 2 )
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{
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out.append("\n\n");
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line_empty = true;
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num_newline = 0;
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}
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// Replace unordered list item markup at begin of line with bullet
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// (TODO multilevel lists, indent multiple lines, etc.)
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if( (line_empty || num_newline) && isULItem(*it) )
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{
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if( num_newline < 2 )
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out.push_back('\n');
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out.append("\xE2\x80\xA2");
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}
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else
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{
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// Collapse multiple whitespace
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if( !line_empty && (num_space || num_newline) )
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out.push_back(' ');
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out.push_back(*it);
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}
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line_empty = false;
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num_space = 0;
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num_newline = 0;
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}
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}
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return out;
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}
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} // namespace simgear
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