final String parse()

in boot/src/main/java/org/netbeans/html/boot/impl/JsCallback.java [27:116]
82 lines of code
18 McCabe index (conditional complexity)

    final String parse(String body, boolean promise) {
        StringBuilder sb = new StringBuilder();
        int pos = 0;
        for (;;) {
            int next = body.indexOf(".@", pos);
            if (next == -1) {
                sb.append(body.substring(pos));
                body = sb.toString();
                break;
            }
            int ident = next;
            while (ident > 0) {
                if (!Character.isJavaIdentifierPart(body.charAt(--ident))) {
                    ident++;
                    break;
                }
            }
            String refId = body.substring(ident, next);
            
            sb.append(body.substring(pos, ident));
            
            int sigBeg = body.indexOf('(', next);
            int sigEnd = body.indexOf(')', sigBeg);
            int colon4 = body.indexOf("::", next);
            if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {
                throw new IllegalStateException(
                    """
                    Wrong format of instance callback. Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':
                    """ 
                    + body
                );
            }
            String fqn = body.substring(next + 2, colon4);
            String method = body.substring(colon4 + 2, sigBeg);
            String params = body.substring(sigBeg, sigEnd + 1);

            int paramBeg = body.indexOf('(', sigEnd + 1);
            if (paramBeg == -1) {
                throw new IllegalStateException(
                    """
                    Wrong format of instance callback. Should be: 'inst.@pkg.Class::method(Ljava/lang/Object;)(param)':
                    """ 
                    + body
                );
            }
            
            sb.append(callMethod(refId, promise, fqn, method, params));
            if (body.charAt(paramBeg + 1) != (')')) {
                sb.append(",");
            }
            pos = paramBeg + 1;
        }
        pos = 0;
        sb = null;
        for (;;) {
            int next = body.indexOf("@", pos);
            if (next == -1) {
                if (sb == null) {
                    return body;
                }
                sb.append(body.substring(pos));
                return sb.toString();
            }
            if (sb == null) {
                sb = new StringBuilder();
            }
            
            sb.append(body.substring(pos, next));
            
            int sigBeg = body.indexOf('(', next);
            int sigEnd = body.indexOf(')', sigBeg);
            int colon4 = body.indexOf("::", next);
            int paramBeg = body.indexOf('(', sigEnd + 1);
            if (sigBeg == -1 || sigEnd == -1 || colon4 == -1 || paramBeg == -1) {
                throw new IllegalStateException(
                    """
                    Wrong format of static callback. Should be: '@pkg.Class::staticMethod(Ljava/lang/Object;)(param)':
                    """ 
                    + body
                );
            }
            String fqn = body.substring(next + 1, colon4);
            String method = body.substring(colon4 + 2, sigBeg);
            String params = body.substring(sigBeg, sigEnd + 1);

            
            sb.append(callMethod(null, promise, fqn, method, params));
            pos = paramBeg + 1;
        }
    }