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package Torello.Java;

class ExtractTypeName
{
    static String extract
        (final String srcFileName, final boolean throwOnBadTypeName)
    {
        final int LEN = srcFileName.length();

        final int END_LEN;

        if (srcFileName.endsWith(".java"))
            END_LEN = 5;

        else if (srcFileName.endsWith(".class"))
            END_LEN = 6;

        else throw new IllegalArgumentException
            ("The File-Name passed is not a valid '.java' or '.class' File");


        // Now, the following loop will search for the first instance of a forward or backwards
        // slash.  If it doesn't find one before reaching the start of the String, the loop breaks
        // The loop start at the end of the String, and searches left-wards (towards the beginning)

        int pos = LEN - END_LEN - 1;

        while (pos >= 0)
        {
            final char c = srcFileName.charAt(pos);
            if (c == '\\')      break;
            if (c == '/')       break;
            pos--;
        }


        // If the loop reached the beginning of the String without finding any of the two standard
        // file-separators, then this "Source-File-Name" is a File-Name without any Directory-Path
        // Information.  Use the entire-beginning of the input string!

        if (pos == -1) pos = 0;

        // Otherwise, make sure to "skip past" the actual File-Separator character!
        else pos++;


        // This is the computed string to return.  It leaves off the beginning Directory Stuff (if
        // there were any), and it also leaves off the ending File-Suffix.

        final String ret = srcFileName.substring(pos, LEN - END_LEN);

        if (! StrSource.isValidJavaIdentifier(ret))
        {
            if (throwOnBadTypeName)
                throw new JavaIdentifierException("You fucked up");
            else
                return null;
        }

        return ret;
    }
}