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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
//
// SVG path tokenizer.
//
//----------------------------------------------------------------------------
/*
* Copyright (c) 2008 Rene Rebe <rene@exactcode.de>
*
*/
#include <string.h>
#include <stdlib.h>
#include "agg_svg_exception.hh"
#include "agg_svg_path_tokenizer.hh"
namespace agg
{
namespace svg
{
//------------------------------------------------------------------------
const char path_tokenizer::s_commands[] = "+-MmZzLlHhVvCcSsQqTtAaFfPp";
const char path_tokenizer::s_numeric[] = ".Ee0123456789";
const char path_tokenizer::s_separators[] = " ,\t\n\r";
//------------------------------------------------------------------------
path_tokenizer::path_tokenizer()
: m_path(0), m_last_number(0.0), m_last_command(0)
{
init_char_mask(m_commands_mask, s_commands);
init_char_mask(m_numeric_mask, s_numeric);
init_char_mask(m_separators_mask, s_separators);
}
//------------------------------------------------------------------------
void path_tokenizer::set_path_str(const char* str)
{
m_path = str;
m_last_command = 0;
m_last_number = 0.0;
}
//------------------------------------------------------------------------
void path_tokenizer::init_char_mask(char* mask, const char* char_set)
{
memset(mask, 0, 256/8);
while(*char_set)
{
unsigned c = unsigned(*char_set++) & 0xFF;
mask[c >> 3] |= 1 << (c & 7);
}
}
//------------------------------------------------------------------------
bool path_tokenizer::next()
{
if(m_path == 0) return false;
// Skip all white spaces and other garbage
while(*m_path && !is_command(*m_path) && !is_numeric(*m_path))
{
if(!is_separator(*m_path))
{
char buf[100];
sprintf(buf, "path_tokenizer::next : Invalid Character %c", *m_path);
throw exception(buf);
}
m_path++;
}
if(*m_path == 0) return false;
if(is_command(*m_path))
{
// Check if the command is a numeric sign character
if(*m_path == '-' || *m_path == '+')
{
return parse_number();
}
m_last_command = *m_path++;
while(*m_path && is_separator(*m_path)) m_path++;
if(*m_path == 0) return true;
}
return parse_number();
}
//------------------------------------------------------------------------
double path_tokenizer::next(char cmd)
{
if(!next()) throw exception("parse_path: Unexpected end of path");
if(last_command() != cmd)
{
char buf[100];
sprintf(buf, "parse_path: Command %c: bad or missing parameters", cmd);
throw exception(buf);
}
return last_number();
}
//------------------------------------------------------------------------
bool path_tokenizer::parse_number()
{
char buf[256]; // Should be enough for any number
char* buf_ptr = buf;
// Copy all sign characters
while(buf_ptr < buf+255 && (*m_path == '-' || *m_path == '+'))
{
*buf_ptr++ = *m_path++;
}
// Copy all numeric characters
while(buf_ptr < buf+255 && (is_numeric(*m_path)))
{
*buf_ptr++ = *m_path++;
}
*buf_ptr = 0;
m_last_number = atof(buf);
return true;
}
} //namespace svg
} //namespace agg
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