codeviewer.java

Struts+Spring+Hibernate开发的BBS,功能很强大很完善

        else {
            return inlineCommentFilter(line);
        }
    }      

    /*
     * Filter inline comments from a line and formats them properly.
     */
    private String inlineCommentFilter(String line) {
        if (line == null || line.equals("")) {
            return "";
        }
        StringBuffer buf = new StringBuffer();
        int index;
        if ((index = line.indexOf("//")) > -1 && !isInsideString(line,index)) {
            buf.append(stringFilter(line.substring(0,index)));
            buf.append(commentStart);
            buf.append(line.substring(index));
            buf.append(commentEnd);
        }
        else {
            buf.append(stringFilter(line));
        }
        return buf.toString();
    } 

    /*
     * Filters strings from a line of text and formats them properly.
     */
    private String stringFilter(String line) {
        if (line == null || line.equals("")) {
            return "";
        }
        StringBuffer buf = new StringBuffer();
        if (line.indexOf("\"") <= -1) {
            return keywordFilter(line);
        }
        int start = 0;
        int startStringIndex = -1;
        int endStringIndex = -1;
        int tempIndex;
        //Keep moving through String characters until we want to stop...
        while ((tempIndex = line.indexOf("\"")) > -1) {
            //We found the beginning of a string
            if (startStringIndex == -1) {
                startStringIndex = 0;
                buf.append( stringFilter(line.substring(start,tempIndex)) );
                buf.append(stringStart).append("\"");
                line = line.substring(tempIndex+1);
            }
            //Must be at the end
            else {
                startStringIndex = -1;
                endStringIndex = tempIndex;
                buf.append(line.substring(0,endStringIndex+1));
                buf.append(stringEnd);
                line = line.substring(endStringIndex+1);
            }
        }

        buf.append( keywordFilter(line) );

        return buf.toString();
    }

    /*
     * Filters keywords from a line of text and formats them properly.
     */
    private String keywordFilter( String line ) {
        if( line == null || line.equals("") ) {
            return "";
        }
        StringBuffer buf = new StringBuffer();
        HashMap usedReservedWords = new HashMap(); // >= Java2 only (not thread-safe)
        //Hashtable usedReservedWords = new Hashtable(); // < Java2 (thread-safe)
        int i=0, startAt=0;
        char ch;
        StringBuffer temp = new StringBuffer();
        while( i < line.length() ) {
            temp.setLength(0);
            ch = line.charAt(i);
            startAt = i;
            // 65-90, uppercase letters
            // 97-122, lowercase letters
            while( i<line.length() && ( ( ch >= 65 && ch <= 90 )
                    || ( ch >= 97 && ch <= 122 ) ) ) {
                temp.append(ch);
                i++;
                if( i < line.length() ) {
                    ch = line.charAt(i);
                }
            }
            String tempString = temp.toString();
            if( reservedWords.containsKey(tempString) && !usedReservedWords.containsKey(tempString)) {
                usedReservedWords.put(tempString,tempString);
                line = replace( line, tempString, (reservedWordStart+tempString+reservedWordEnd) );
                i += (reservedWordStart.length() + reservedWordEnd.length());
            }
            else {
                i++;
            }            
        }
        buf.append(line);
        return buf.toString();
    }

    /*
     * All important replace method. Replaces all occurences of oldString in
     * line with newString.
     */
    private String replace( String line, String oldString, String newString ) {
        int i=0;
        while( ( i=line.indexOf( oldString, i ) ) >= 0 ) {
            line = (new StringBuffer().append(line.substring(0,i)).append(newString).append(line.substring(i+oldString.length()))).toString();
            i += newString.length();
        }
        return line;
    }

    /*
     * Checks to see if some position in a line is between String start and
     * ending characters. Not yet used in code or fully working :)
     */
    private boolean isInsideString(String line, int position) {
        if (line.indexOf("\"") < 0) {
            return false;
        }
        int index;
        String left = line.substring(0,position);
        String right = line.substring(position);
        int leftCount = 0;
        int rightCount = 0;
        while ((index = left.indexOf("\"")) > -1) {
            leftCount ++;
            left = left.substring(index+1); 
        }
        while ((index = right.indexOf("\"")) > -1) {
            rightCount ++;
            right = right.substring(index+1); 
        }
        if (rightCount % 2 != 0 && leftCount % 2 != 0) {
            return true;
        }
        else {
            return false;
        }        
    }

    /*
     * Load Hashtable (or HashMap) with Java reserved words.
     */
    private static void loadHash() {
        reservedWords.put( "abstract", "abstract" );
        reservedWords.put( "do", "do" );
        reservedWords.put( "inner", "inner" );
        reservedWords.put( "public", "public" );
        reservedWords.put( "var", "var" );
        reservedWords.put( "boolean", "boolean" );
        reservedWords.put( "continue", "continue" );
        reservedWords.put( "int", "int" );
        reservedWords.put( "return", "return" );
        reservedWords.put( "void", "void" );
        reservedWords.put( "break", "break" );
        reservedWords.put( "else", "else" );
        reservedWords.put( "interface", "interface" );
        reservedWords.put( "short", "short" );
        reservedWords.put( "volatile", "volatile" );
        reservedWords.put( "byvalue", "byvalue" );
        reservedWords.put( "extends", "extends" );
        reservedWords.put( "long", "long" );
        reservedWords.put( "static", "static" );
        reservedWords.put( "while", "while" );
        reservedWords.put( "case", "case" );
        reservedWords.put( "final", "final" );
        reservedWords.put( "naive", "naive" );
        reservedWords.put( "super", "super" );
        reservedWords.put( "transient", "transient" );
        reservedWords.put( "cast", "cast" );
        reservedWords.put( "float", "float" );
        reservedWords.put( "new", "new" );
        reservedWords.put( "rest", "rest" );
        reservedWords.put( "catch", "catch" );
        reservedWords.put( "for", "for" );
        reservedWords.put( "null", "null" );
        reservedWords.put( "synchronized", "synchronized" );
        reservedWords.put( "char", "char" );
        reservedWords.put( "finally", "finally" );
        reservedWords.put( "operator", "operator" );
        reservedWords.put( "this", "this" );
        reservedWords.put( "class", "class" );
        reservedWords.put( "generic", "generic" );
        reservedWords.put( "outer", "outer" );
        reservedWords.put( "switch", "switch" );
        reservedWords.put( "const", "const" );
        reservedWords.put( "goto", "goto" );
        reservedWords.put( "package", "package" );
        reservedWords.put( "throw", "throw" );
        reservedWords.put( "double", "double" );
        reservedWords.put( "if", "if" );
        reservedWords.put( "private", "private" );
        reservedWords.put( "true", "true" );
        reservedWords.put( "default", "default" );
        reservedWords.put( "import", "import" );
        reservedWords.put( "protected", "protected" );
        reservedWords.put( "try", "try" );
    }
}