public static bool TryParse(ref string error, string rangeString, out IndexedRangeSet output)
{
var tempRange = new List <Range>();
var tempIndexes = new List <int>();
var length = rangeString.Length;
var str = rangeString.ToCharArray();
int index = 0;
int start = 0;
int end = 0;
output = null;
//Phase == 0 -> index
//Phase == 1 -> start
//Phase == 2 -> end
int phase = 0;
bool lastPlus = false;
bool tallyingInZero = false;
if (String.IsNullOrWhiteSpace(rangeString))
{
output = new IndexedRangeSet(tempRange, tempIndexes);
return(true);
}
for (int i = 0; i < length; i++)
{
var c = str[i];
if (Char.IsWhiteSpace(c) || Char.IsLetter(c))
{
continue;
}
lastPlus = false;
switch (phase)
{
case 0:
if (Char.IsNumber(c))
{
index = ((index << 3) + (index << 1)) + (c - '0');
tallyingInZero = true;
}
else if (c == ':')
{
start = 0;
phase = 1;
}
else if (c == ',')
{
tempRange.Add(new Range()
{
Start = index, Stop = index
});
tempIndexes.Add(index);
index = 0;
start = 0;
end = 0;
}
else if (c == '-')
{
if (!tallyingInZero)
{
error = "No number was inserted before a range!";
return(false);
}
start = index;
end = 0;
phase = 2;
}
else if (c == '+')
{
if (!tallyingInZero)
{
error = "No number was inserted before a range!";
return(false);
}
end = int.MaxValue;
tempRange.Add(new Range {
Start = start, Stop = end
});
tempIndexes.Add(start);
index = 0;
start = 0;
phase = 0;
tallyingInZero = false;
lastPlus = true;
}
else
{
error = "Unrecognized symbol " + c;
return(false);
}
break;
case 1:
if (Char.IsNumber(c))
{
start = ((start << 3) + (start << 1)) + (c - '0');
}
else if (c == '+')
{
end = int.MaxValue;
tempRange.Add(new Range()
{
Start = start, Stop = end
});
tempIndexes.Add(index);
index = 0;
start = 0;
phase = 0;
tallyingInZero = false;
lastPlus = true;
}
else if (c == '-')
{
end = 0;
phase = 2;
}
break;
case 2:
if (Char.IsNumber(c))
{
end = ((end << 3) + (end << 1)) + (c - '0');
}
else if (c == ',')
{
tempRange.Add(new Range()
{
Start = start, Stop = end
});
tempIndexes.Add(index);
index = 0;
phase = 0;
start = 0;
end = 0;
tallyingInZero = false;
}
break;
}
}
if (phase == 2)
{
tempRange.Add(new Range()
{
Start = start, Stop = end
});
tempIndexes.Add(index);
}
else if (phase == 0 && tallyingInZero)
{
tempRange.Add(new Range()
{
Start = index, Stop = index
});
tempIndexes.Add(index);
}
else if (!lastPlus)
{
error = "Ended while reading a " + (phase == 0 ? "range's index!" : "range's start value!");
return(false);
}
output = new IndexedRangeSet(tempRange, tempIndexes);
return(true);
}
public static bool TryParse(ref string error, string rangeString, out IndexedRangeSet output)
{
var tempRange = new List<Range>();
var tempIndexes = new List<int>();
var length = rangeString.Length;
var str = rangeString.ToCharArray();
int index = 0;
int start = 0;
int end = 0;
output = null;
//Phase == 0 -> index
//Phase == 1 -> start
//Phase == 2 -> end
int phase = 0;
bool lastPlus = false;
bool tallyingInZero = false;
if ( String.IsNullOrWhiteSpace( rangeString ) )
{
output = new IndexedRangeSet( tempRange, tempIndexes );
return true;
}
for ( int i = 0; i < length; i++ )
{
var c = str[i];
if ( Char.IsWhiteSpace( c ) || Char.IsLetter( c ) ) continue;
lastPlus = false;
switch ( phase )
{
case 0:
if ( Char.IsNumber( c ) )
{
index = ( ( index << 3 ) + ( index << 1 ) ) + ( c - '0' );
tallyingInZero = true;
}
else if ( c == ':' )
{
start = 0;
phase = 1;
}
else if ( c == ',' )
{
tempRange.Add( new Range() { Start = index, Stop = index } );
tempIndexes.Add( index );
index = 0;
start = 0;
end = 0;
}
else if ( c == '-' )
{
if ( !tallyingInZero )
{
error = "No number was inserted before a range!";
return false;
}
start = index;
end = 0;
phase = 2;
}
else if ( c == '+' )
{
if ( !tallyingInZero )
{
error = "No number was inserted before a range!";
return false;
}
end = int.MaxValue;
tempRange.Add( new Range { Start = start, Stop = end } );
tempIndexes.Add( start );
index = 0;
start = 0;
phase = 0;
tallyingInZero = false;
lastPlus = true;
}
else
{
error = "Unrecognized symbol " + c;
return false;
}
break;
case 1:
if ( Char.IsNumber( c ) )
{
start = ( ( start << 3 ) + ( start << 1 ) ) + ( c - '0' );
}
else if ( c == '+' )
{
end = int.MaxValue;
tempRange.Add( new Range() { Start = start, Stop = end } );
tempIndexes.Add( index );
index = 0;
start = 0;
phase = 0;
tallyingInZero = false;
lastPlus = true;
}
else if ( c == '-' )
{
end = 0;
phase = 2;
}
break;
case 2:
if ( Char.IsNumber( c ) )
{
end = ( ( end << 3 ) + ( end << 1 ) ) + ( c - '0' );
}
else if ( c == ',' )
{
tempRange.Add( new Range() { Start = start, Stop = end } );
tempIndexes.Add( index );
index = 0;
phase = 0;
start = 0;
end = 0;
tallyingInZero = false;
}
break;
}
}
if ( phase == 2 )
{
tempRange.Add( new Range() { Start = start, Stop = end } );
tempIndexes.Add( index );
}
else if ( phase == 0 && tallyingInZero )
{
tempRange.Add( new Range() { Start = index, Stop = index } );
tempIndexes.Add( index );
}
else if ( !lastPlus )
{
error = "Ended while reading a " + ( phase == 0 ? "range's index!" : "range's start value!" );
return false;
}
output = new IndexedRangeSet( tempRange, tempIndexes );
return true;
}
public static bool TryParse(string rangeString, out IndexedRangeSet output)
{
string error = null;
return(TryParse(ref error, rangeString, out output));
}
public static bool TryParse(string rangeString, out IndexedRangeSet output)
{
string error = null;
return TryParse( ref error, rangeString, out output );
}
