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package Torello.Java;

class LOCAsStr
{
    static String run
        (char[] code, int numLeadingSpaces, int fcPos, int spacesPerTab)
    {
        StringBuilder sb = new StringBuilder();

        // Loop Control Variables
        int possibleEndingWhiteSpaceCount   = 0;
        int relativePos                     = numLeadingSpaces % spacesPerTab;
        int i                               = fcPos;

        while ((i < code.length) && (code[i] != '\n'))
        {
            if (code[i] == '\t')
                while (relativePos < 4)
                    { sb.append(' '); relativePos++; possibleEndingWhiteSpaceCount++; }


            else if ((code[i] == ' ') || (code[i] == '\r') || (code[i] == '\f'))
            { sb.append(' '); relativePos++; possibleEndingWhiteSpaceCount++; }

            else
            { sb.append(code[i]); relativePos++; possibleEndingWhiteSpaceCount=0; }

            i++;
            relativePos %= 4;
        }


        if (i < code.length)
        {
            if (possibleEndingWhiteSpaceCount > 0)
            {
                sb.setCharAt(sb.length() - possibleEndingWhiteSpaceCount, '\n');
                return sb.substring(0, sb.length() - possibleEndingWhiteSpaceCount + 1);
            }

            else return sb.append('\n').toString();
        }

        return (possibleEndingWhiteSpaceCount > 0)
            ? sb.substring(0, sb.length() - possibleEndingWhiteSpaceCount)
            : sb.toString();
    }    
}