xml11char.java

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     * Returns true if the specified character is a valid name start
     * character as defined by production [4] in the XML 1.1
     * specification.
     *
     * @param c The character to check.
     */
    public static boolean isXML11NameStart(int c) {
        return (c < 0x10000 && (XML11CHARS[c] & MASK_XML11_NAME_START) != 0)
            || (0x10000 <= c && c < 0xF0000);
    } // isXML11NameStart(int):boolean

    /**
     * Returns true if the specified character is a valid name
     * character as defined by production [4a] in the XML 1.1
     * specification.
     *
     * @param c The character to check.
     */
    public static boolean isXML11Name(int c) {
        return (c < 0x10000 && (XML11CHARS[c] & MASK_XML11_NAME) != 0) 
            || (c >= 0x10000 && c < 0xF0000);
    } // isXML11Name(int):boolean

    /**
     * Returns true if the specified character is a valid NCName start
     * character as defined by production [4] in Namespaces in XML
     * 1.1 recommendation.
     *
     * @param c The character to check.
     */
    public static boolean isXML11NCNameStart(int c) {
        return (c < 0x10000 && (XML11CHARS[c] & MASK_XML11_NCNAME_START) != 0)
            || (0x10000 <= c && c < 0xF0000);
    } // isXML11NCNameStart(int):boolean

    /**
     * Returns true if the specified character is a valid NCName
     * character as defined by production [5] in Namespaces in XML
     * 1.1 recommendation.
     *
     * @param c The character to check.
     */
    public static boolean isXML11NCName(int c) {
        return (c < 0x10000 && (XML11CHARS[c] & MASK_XML11_NCNAME) != 0)
            || (0x10000 <= c && c < 0xF0000);
    } // isXML11NCName(int):boolean
    
    /**
     * Returns whether the given character is a valid 
     * high surrogate for a name character. This includes
     * all high surrogates for characters [0x10000-0xEFFFF].
     * In other words everything excluding planes 15 and 16.
     *
     * @param c The character to check.
     */
    public static boolean isXML11NameHighSurrogate(int c) {
        return (0xD800 <= c && c <= 0xDB7F);
    }

    /*
     * [5] Name ::= NameStartChar NameChar*
     */
    /**
     * Check to see if a string is a valid Name according to [5]
     * in the XML 1.1 Recommendation
     *
     * @param name string to check
     * @return true if name is a valid Name
     */
    public static boolean isXML11ValidName(String name) {
        int length = name.length();
        if (length == 0)
            return false;
        int i = 1;
        char ch = name.charAt(0);
        if( !isXML11NameStart(ch) ) {
            if ( length > 1 && isXML11NameHighSurrogate(ch) ) {
                char ch2 = name.charAt(1);
                if ( !XMLChar.isLowSurrogate(ch2) || 
                     !isXML11NameStart(XMLChar.supplemental(ch, ch2)) ) {
                    return false;
                }
                i = 2;
            }
            else {
                return false;
            }
        }
        while (i < length) {
            ch = name.charAt(i);
            if ( !isXML11Name(ch) ) {
                if ( ++i < length && isXML11NameHighSurrogate(ch) ) {
                    char ch2 = name.charAt(i);
                    if ( !XMLChar.isLowSurrogate(ch2) || 
                         !isXML11Name(XMLChar.supplemental(ch, ch2)) ) {
                        return false;
                    }
                }
                else {
                    return false;
                }
            }
            ++i;
        }
        return true;
    } // isXML11ValidName(String):boolean
    

    /*
     * from the namespace 1.1 rec
     * [4] NCName ::= NCNameStartChar NCNameChar*
     */
    /**
     * Check to see if a string is a valid NCName according to [4]
     * from the XML Namespaces 1.1 Recommendation
     *
     * @param ncName string to check
     * @return true if name is a valid NCName
     */
    public static boolean isXML11ValidNCName(String ncName) {
        int length = ncName.length();
        if (length == 0)
            return false;
        int i = 1;
        char ch = ncName.charAt(0);
        if( !isXML11NCNameStart(ch) ) {
            if ( length > 1 && isXML11NameHighSurrogate(ch) ) {
                char ch2 = ncName.charAt(1);
                if ( !XMLChar.isLowSurrogate(ch2) || 
                     !isXML11NCNameStart(XMLChar.supplemental(ch, ch2)) ) {
                    return false;
                }
                i = 2;
            }
            else {
                return false;
            }
        }
        while (i < length) {
            ch = ncName.charAt(i);
            if ( !isXML11NCName(ch) ) {
                if ( ++i < length && isXML11NameHighSurrogate(ch) ) {
                    char ch2 = ncName.charAt(i);
                    if ( !XMLChar.isLowSurrogate(ch2) || 
                         !isXML11NCName(XMLChar.supplemental(ch, ch2)) ) {
                        return false;
                    }
                }
                else {
                    return false;
                }
            }
            ++i;
        }
        return true;
    } // isXML11ValidNCName(String):boolean

    /*
     * [7] Nmtoken ::= (NameChar)+
     */
    /**
     * Check to see if a string is a valid Nmtoken according to [7]
     * in the XML 1.1 Recommendation
     *
     * @param nmtoken string to check
     * @return true if nmtoken is a valid Nmtoken 
     */
    public static boolean isXML11ValidNmtoken(String nmtoken) {
        int length = nmtoken.length();
        if (length == 0)
            return false;
        for (int i = 0; i < length; ++i ) {
            char ch = nmtoken.charAt(i);
            if( !isXML11Name(ch) ) {
                if ( ++i < length && isXML11NameHighSurrogate(ch) ) {
                    char ch2 = nmtoken.charAt(i);
                    if ( !XMLChar.isLowSurrogate(ch2) || 
                         !isXML11Name(XMLChar.supplemental(ch, ch2)) ) {
                        return false;
                    }
                }
                else {
                    return false;
                }
            }
        }
        return true;
    } // isXML11ValidName(String):boolean
    
    /**
      * Simple check to determine if qname is legal. If it returns false
      * then <param>str</param> is illegal; if it returns true then 
      * <param>str</param> is legal.
      */
     public static boolean isXML11ValidQName(String str) {

        final int colon = str.indexOf(':');

        if (colon == 0 || colon == str.length() - 1) {
            return false;
        }
       
        if (colon > 0) {
            final String prefix = str.substring(0,colon);
            final String localPart = str.substring(colon+1);
            return isXML11ValidNCName(prefix) && isXML11ValidNCName(localPart);
        }
        else {
            return isXML11ValidNCName(str);
        }
     }

} // class XML11Char