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package Torello.Java;

class IsJavaTypeStr
{
    static boolean is(String s)
    {
        if (s.length() == 0) return false;


        // Java restricts the first character of a java-identifier to a smaller subset than the
        // other characters in an identifier.  Use method 'isJavaIdentifierStart'

        if (! Character.isJavaIdentifierStart(s.charAt(0))) return false;

        int     len = s.length();
        char    c   = 0;

        for (int i=1; i < len; i++)

            if (! Character.isJavaIdentifierPart(c = s.charAt(i)))
            {
                if (c == '.')
                {
                    // A second (subsequent) period-character (in a row) ==> FALSE
                    if (s.charAt(i-1) == '.') return false;

                    // The LAST character in the String is a period-character ==> FALSE
                    if (i == (len-1)) return false;


                    // The character immediately following a period isn't a valid Java Identifier
                    // Start ==> FALSE

                    if (! Character.isJavaIdentifierStart(s.charAt(++i))) return false;
                }

                else
                    // Character is NEITHER a period, NOR a Java Identifier Part ==> FALSE
                    return false;
            }


        // All metrics / tests have succeeded (which would have resulted in immediate exiting of
        // this method, and a FALSE return value) ... therefore return TRUE.

        return true;
    }    
}