// THIS FILE IS PART OF SVG PROJECT
|
// THE SVG PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MS-PL License.
|
// COPYRIGHT (C) svg-net. ALL RIGHTS RESERVED.
|
// GITHUB: https://github.com/svg-net/SVG
|
|
using System.Globalization;
|
|
namespace AntdUI.Svg
|
{
|
internal class CoordinateParser
|
{
|
private enum NumState
|
{
|
invalid,
|
separator,
|
prefix,
|
integer,
|
decPlace,
|
fraction,
|
exponent,
|
expPrefix,
|
expValue
|
}
|
|
private string _coords;
|
private int _pos = 0;
|
private NumState _currState = NumState.separator;
|
private NumState _newState = NumState.separator;
|
private int i = 0;
|
private bool _parseWorked = true;
|
|
public int Position { get { return _pos; } }
|
|
public CoordinateParser(string coords)
|
{
|
_coords = coords;
|
if (string.IsNullOrEmpty(_coords)) _parseWorked = false;
|
if (char.IsLetter(coords[0])) i++;
|
}
|
|
public bool HasMore { get { return _parseWorked; } }
|
|
private bool MarkState(bool state)
|
{
|
_parseWorked = state;
|
i++;
|
return state;
|
}
|
|
public bool TryGetBool(out bool result)
|
{
|
while (i < _coords.Length && _parseWorked)
|
{
|
switch (_currState)
|
{
|
case NumState.separator:
|
if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else if (_coords[i] == '0')
|
{
|
result = false;
|
_newState = NumState.separator;
|
_pos = i + 1;
|
return MarkState(true);
|
}
|
else if (_coords[i] == '1')
|
{
|
result = true;
|
_newState = NumState.separator;
|
_pos = i + 1;
|
return MarkState(true);
|
}
|
else
|
{
|
result = false;
|
return MarkState(false);
|
}
|
break;
|
default:
|
result = false;
|
return MarkState(false);
|
}
|
i++;
|
}
|
result = false;
|
return MarkState(false);
|
}
|
|
public bool TryGetFloat(out float result)
|
{
|
while (i < _coords.Length && _parseWorked)
|
{
|
switch (_currState)
|
{
|
case NumState.separator:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.integer;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case '.':
|
_newState = NumState.decPlace;
|
break;
|
case '+':
|
case '-':
|
_newState = NumState.prefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
case NumState.prefix:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.integer;
|
}
|
else if (_coords[i] == '.')
|
{
|
_newState = NumState.decPlace;
|
}
|
else
|
{
|
_newState = NumState.invalid;
|
}
|
break;
|
case NumState.integer:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.integer;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case '.':
|
_newState = NumState.decPlace;
|
break;
|
case 'E':
|
case 'e':
|
_newState = NumState.exponent;
|
break;
|
case '+':
|
case '-':
|
_newState = NumState.prefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
case NumState.decPlace:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.fraction;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case 'E':
|
case 'e':
|
_newState = NumState.exponent;
|
break;
|
case '+':
|
case '-':
|
_newState = NumState.prefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
case NumState.fraction:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.fraction;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case '.':
|
_newState = NumState.decPlace;
|
break;
|
case 'E':
|
case 'e':
|
_newState = NumState.exponent;
|
break;
|
case '+':
|
case '-':
|
_newState = NumState.prefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
case NumState.exponent:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.expValue;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.invalid;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case '+':
|
case '-':
|
_newState = NumState.expPrefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
case NumState.expPrefix:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.expValue;
|
}
|
else
|
{
|
_newState = NumState.invalid;
|
}
|
break;
|
case NumState.expValue:
|
if (char.IsNumber(_coords[i]))
|
{
|
_newState = NumState.expValue;
|
}
|
else if (IsCoordSeparator(_coords[i]))
|
{
|
_newState = NumState.separator;
|
}
|
else
|
{
|
switch (_coords[i])
|
{
|
case '.':
|
_newState = NumState.decPlace;
|
break;
|
case '+':
|
case '-':
|
_newState = NumState.prefix;
|
break;
|
default:
|
_newState = NumState.invalid;
|
break;
|
}
|
}
|
break;
|
}
|
|
if (_newState < _currState)
|
{
|
result = float.Parse(_coords.Substring(_pos, i - _pos), NumberStyles.Float, CultureInfo.InvariantCulture);
|
_pos = i;
|
_currState = _newState;
|
return MarkState(true);
|
}
|
else if (_newState != _currState && _currState == NumState.separator)
|
{
|
_pos = i;
|
}
|
|
if (_newState == NumState.invalid)
|
{
|
result = float.MinValue;
|
return MarkState(false);
|
}
|
_currState = _newState;
|
i++;
|
}
|
|
if (_currState == NumState.separator || !_parseWorked || _pos >= _coords.Length)
|
{
|
result = float.MinValue;
|
return MarkState(false);
|
}
|
else
|
{
|
result = float.Parse(_coords.Substring(_pos, _coords.Length - _pos), NumberStyles.Float, CultureInfo.InvariantCulture);
|
_pos = _coords.Length;
|
return MarkState(true);
|
}
|
}
|
|
private static bool IsCoordSeparator(char value)
|
{
|
switch (value)
|
{
|
case ' ':
|
case '\t':
|
case '\n':
|
case '\r':
|
case ',':
|
return true;
|
}
|
return false;
|
}
|
}
|
}
|
