private boolean hasJspRoot()

in src/main/java/org/apache/sling/scripting/jsp/jasper/compiler/ParserController.java [533:583]
44 lines of code
17 McCabe index (conditional complexity)

    private boolean hasJspRoot(JspReader reader) throws JasperException {

        // <prefix>:root must be the first element
        Mark start = null;
        while ((start = reader.skipUntil("<")) != null) {
            int c = reader.nextChar();
            if (c != '!' && c != '?') break;
        }
        if (start == null) {
            return false;
        }
        Mark stop = reader.skipUntil(":root");
        if (stop == null) {
            return false;
        }
        // call substring to get rid of leading '<'
        String prefix = reader.getText(start, stop).substring(1);

        start = stop;
        stop = reader.skipUntil(">");
        if (stop == null) {
            return false;
        }

        // Determine namespace associated with <root> element's prefix
        String root = reader.getText(start, stop);
        String xmlnsDecl = "xmlns:" + prefix;
        int index = root.indexOf(xmlnsDecl);
        if (index == -1) {
            return false;
        }
        index += xmlnsDecl.length();
        while (index < root.length()
                && Character.isWhitespace(root.charAt(index))) {
            index++;
        }
        if (index < root.length() && root.charAt(index) == '=') {
            index++;
            while (index < root.length()
                    && Character.isWhitespace(root.charAt(index))) {
                index++;
            }
            if (index < root.length() && root.charAt(index++) == '"'
                && root.regionMatches(index, JSP_URI, 0,
                        JSP_URI.length())) {
                return true;
            }
        }

        return false;
    }