private void parseAVTemplate()

in xalan/src/main/java/org/apache/xalan/xsltc/compiler/AttributeValueTemplate.java [74:204]
114 lines of code
29 McCabe index (conditional complexity)

    private void parseAVTemplate(String text, Parser parser) {
        StringTokenizer tokenizer = 
            new StringTokenizer(text, "{}\"\'", true);
        
        /*
          * First pass: replace double curly braces and delimit expressions
          * Simple automaton to parse ATVs, delimit expressions and report
          * errors.
          */
        String t = null;
        String lookahead = null;
        StringBuffer buffer = new StringBuffer();
        int state = OUT_EXPR;
        
        while (tokenizer.hasMoreTokens()) {            
            // Use lookahead if available
            if (lookahead != null) {
                t = lookahead;
                lookahead = null;
            }
            else {
                t = tokenizer.nextToken();
            }
            
            if (t.length() == 1) {
                switch (t.charAt(0)) {
                    case '{':
                        switch (state) {
                            case OUT_EXPR:
                                lookahead = tokenizer.nextToken();
                                if (lookahead.equals("{")) {
                                    buffer.append(lookahead);    // replace {{ by {
                                    lookahead = null;
                                }
                                else {
                                    buffer.append(DELIMITER);
                                    state = IN_EXPR;                                    
                                }
                                break;
                            case IN_EXPR:
                            case IN_EXPR_SQUOTES:
                            case IN_EXPR_DQUOTES:
                                reportError(getParent(), parser,
                                            ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
                                break;
                        }                                                
                        break;
                    case '}':
                        switch (state) {
                            case OUT_EXPR:
                                lookahead = tokenizer.nextToken();
                                if (lookahead.equals("}")) {
                                    buffer.append(lookahead);    // replace }} by }
                                    lookahead = null;
                                }
                                else {
                                    reportError(getParent(), parser,
                                            ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
                                }
                                break;
                            case IN_EXPR:
                                buffer.append(DELIMITER);
                                state = OUT_EXPR;
                                break;
                            case IN_EXPR_SQUOTES:
                            case IN_EXPR_DQUOTES:
                                buffer.append(t);
                                break;
                        }
                        break;
                    case '\'':
                        switch (state) {
                            case IN_EXPR:
                                state = IN_EXPR_SQUOTES;
                                break;
                            case IN_EXPR_SQUOTES:
                                state = IN_EXPR;
                                break;
                            case OUT_EXPR:
                            case IN_EXPR_DQUOTES:
                                break;
                        }
                        buffer.append(t);
                        break;
                    case '\"':
                        switch (state) {
                            case IN_EXPR:
                                state = IN_EXPR_DQUOTES;
                                break;
                            case IN_EXPR_DQUOTES:
                                state = IN_EXPR;
                                break;
                            case OUT_EXPR:
                            case IN_EXPR_SQUOTES:
                                break;
                        }
                        buffer.append(t);
                        break;
                    default:
                        buffer.append(t);
                        break;
                }
            }
            else {
                buffer.append(t);
            }
        }

        // Must be in OUT_EXPR at the end of parsing
        if (state != OUT_EXPR) {
            reportError(getParent(), parser,
                        ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
        }
        
        /*
          * Second pass: split up buffer into literal and non-literal expressions.
          */
        tokenizer = new StringTokenizer(buffer.toString(), DELIMITER, true);
        
        while (tokenizer.hasMoreTokens()) {
            t = tokenizer.nextToken();
            
            if (t.equals(DELIMITER)) {
		addElement(parser.parseExpression(this, tokenizer.nextToken()));
                tokenizer.nextToken();      // consume other delimiter
            }
            else {
		addElement(new LiteralExpr(t)); 
            }
        }        
    }