public static SubString ToSubString(this SubString value, int begin = 0, int count = int.MaxValue / 2)
{
return(new SubString(value, begin, count));
}
public static IEnumerable <SubString> ReadLines(this SubString subString)
{
var baseString = subString.BaseString;
var begin = subString.Begin;
var end = subString.End;
var beginLine = begin;
var count = 0;
var state = ParseLineState.NewLine;
for (var iter = begin; iter < end; ++iter)
{
var ch = baseString[iter];
switch (state)
{
case ParseLineState.ConsumedCR:
yield return(new SubString(baseString, beginLine, count));
switch (ch)
{
case '\r':
beginLine = iter;
count = 0;
state = ParseLineState.ConsumedCR;
break;
case '\n':
state = ParseLineState.NewLine;
break;
default:
beginLine = iter;
count = 1;
state = ParseLineState.Inline;
break;
}
break;
case ParseLineState.NewLine:
beginLine = iter;
count = 0;
switch (ch)
{
case '\r':
state = ParseLineState.ConsumedCR;
break;
case '\n':
yield return(new SubString(baseString, beginLine, count));
state = ParseLineState.NewLine;
break;
default:
state = ParseLineState.Inline;
++count;
break;
}
break;
case ParseLineState.Inline:
default:
switch (ch)
{
case '\r':
state = ParseLineState.ConsumedCR;
break;
case '\n':
yield return(new SubString(baseString, beginLine, count));
state = ParseLineState.NewLine;
break;
default:
++count;
break;
}
break;
}
}
switch (state)
{
case ParseLineState.NewLine:
yield return(new SubString(baseString, 0, 0));
break;
case ParseLineState.ConsumedCR:
yield return(new SubString(baseString, beginLine, count));
yield return(new SubString(baseString, 0, 0));
break;
case ParseLineState.Inline:
default:
yield return(new SubString(baseString, beginLine, count));
break;
}
}
public static void AppendSubString(this StringBuilder sb, SubString ss)
{
sb.Append(ss.BaseString, ss.Begin, ss.Length);
}