xmlobjectimpl.java

這是一個javascript 的 interpreter是了解 web browser的好材料

            case Id_length:            arity=0; s="length";            break;
            case Id_localName:         arity=0; s="localName";         break;
            case Id_name:              arity=0; s="name";              break;
            case Id_namespace:         arity=1; s="namespace";         break;
            case Id_namespaceDeclarations:
                arity=0; s="namespaceDeclarations"; break;
            case Id_nodeKind:          arity=0; s="nodeKind";          break;
            case Id_normalize:         arity=0; s="normalize";         break;
            case Id_parent:            arity=0; s="parent";            break;
            case Id_prependChild:      arity=1; s="prependChild";      break;
            case Id_processingInstructions:
                arity=1; s="processingInstructions"; break;
            case Id_propertyIsEnumerable:
                arity=1; s="propertyIsEnumerable"; break;
            case Id_removeNamespace:   arity=1; s="removeNamespace";   break;
            case Id_replace:           arity=2; s="replace";           break;
            case Id_setChildren:       arity=1; s="setChildren";       break;
            case Id_setLocalName:      arity=1; s="setLocalName";      break;
            case Id_setName:           arity=1; s="setName";           break;
            case Id_setNamespace:      arity=1; s="setNamespace";      break;
            case Id_text:              arity=0; s="text";              break;
            case Id_toString:          arity=0; s="toString";          break;
            case Id_toXMLString:       arity=1; s="toXMLString";       break;
            case Id_valueOf:           arity=0; s="valueOf";           break;

            default: throw new IllegalArgumentException(String.valueOf(id));
        }
        initPrototypeMethod(XMLOBJECT_TAG, id, s, arity);
    }

    private Object[] toObjectArray(Object[] typed) {
        Object[] rv = new Object[typed.length];
        for (int i=0; i<rv.length; i++) {
            rv[i] = typed[i];
        }
        return rv;
    }

    private void xmlMethodNotFound(Object object, String name) {
        throw ScriptRuntime.notFunctionError(object, name);
    }

    public Object execIdCall(IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
        if (!f.hasTag(XMLOBJECT_TAG)) {
            return super.execIdCall(f, cx, scope, thisObj, args);
        }
        int id = f.methodId();
        if (id == Id_constructor) {
            return jsConstructor(cx, thisObj == null, args);
        }

        // All (XML|XMLList).prototype methods require thisObj to be XML
        if (!(thisObj instanceof XMLObjectImpl))
            throw incompatibleCallError(f);
        XMLObjectImpl realThis = (XMLObjectImpl)thisObj;

        XML xml = realThis.getXML();
        switch (id) {
            case Id_appendChild: {
                if (xml == null) xmlMethodNotFound(realThis, "appendChild");
                return xml.appendChild(arg(args, 0));
            }
            case Id_addNamespace: {
                if (xml == null) xmlMethodNotFound(realThis, "addNamespace");
                Namespace ns = lib.castToNamespace(cx, arg(args, 0));
                return xml.addNamespace(ns);
            }
            case Id_childIndex: {
                if (xml == null) xmlMethodNotFound(realThis, "childIndex");
                return ScriptRuntime.wrapInt(xml.childIndex());
            }
            case Id_inScopeNamespaces: {
                if (xml == null) xmlMethodNotFound(realThis, "inScopeNamespaces");
                return cx.newArray(scope, toObjectArray(xml.inScopeNamespaces()));
            }
            case Id_insertChildAfter: {
                if (xml == null) xmlMethodNotFound(realThis, "insertChildAfter");
                Object arg0 = arg(args, 0);
                if (arg0 == null || arg0 instanceof XML) {
                    return xml.insertChildAfter((XML)arg0, arg(args, 1));
                }
                return Undefined.instance;
            }
            case Id_insertChildBefore: {
                if (xml == null) xmlMethodNotFound(realThis, "insertChildBefore");
                Object arg0 = arg(args, 0);
                if (arg0 == null || arg0 instanceof XML) {
                    return xml.insertChildBefore((XML)arg0, arg(args, 1));
                }
                return Undefined.instance;
            }
            case Id_localName: {
                if (xml == null) xmlMethodNotFound(realThis, "localName");
                return xml.localName();
            }
            case Id_name: {
                if (xml == null) xmlMethodNotFound(realThis, "name");
                return xml.name();
            }
            case Id_namespace: {
                if (xml == null) xmlMethodNotFound(realThis, "namespace");
                String prefix = (args.length > 0) ? ScriptRuntime.toString(args[0]) : null;
                Namespace rv = xml.namespace(prefix);
                if (rv == null) {
                    return Undefined.instance;
                } else {
                    return rv;
                }
            }
            case Id_namespaceDeclarations: {
                if (xml == null) xmlMethodNotFound(realThis, "namespaceDeclarations");
                Namespace[] array = xml.namespaceDeclarations();
                return cx.newArray(scope, toObjectArray(array));
            }
            case Id_nodeKind: {
                if (xml == null) xmlMethodNotFound(realThis, "nodeKind");
                return xml.nodeKind();
            }
            case Id_prependChild: {
                if (xml == null) xmlMethodNotFound(realThis, "prependChild");
                return xml.prependChild(arg(args, 0));
            }
            case Id_removeNamespace: {
                if (xml == null) xmlMethodNotFound(realThis, "removeNamespace");
                Namespace ns = lib.castToNamespace(cx, arg(args, 0));
                return xml.removeNamespace(ns);
            }
            case Id_replace: {
                if (xml == null) xmlMethodNotFound(realThis, "replace");
                XMLName xmlName = lib.toXMLNameOrIndex(cx, arg(args, 0));
                Object arg1 = arg(args, 1);
                if (xmlName == null) {
                    //    I refuse to believe that this number will exceed 2^31
                    int index = (int)ScriptRuntime.lastUint32Result(cx);
                    return xml.replace(index, arg1);
                } else {
                    return xml.replace(xmlName, arg1);
                }
            }
            case Id_setChildren: {
                if (xml == null) xmlMethodNotFound(realThis, "setChildren");
                return xml.setChildren(arg(args, 0));
            }
            case Id_setLocalName: {
                if (xml == null) xmlMethodNotFound(realThis, "setLocalName");
                String localName;
                Object arg = arg(args, 0);
                if (arg instanceof QName) {
                    localName = ((QName)arg).localName();
                } else {
                    localName = ScriptRuntime.toString(arg);
                }
                xml.setLocalName(localName);
                return Undefined.instance;
            }
            case Id_setName: {
                if (xml == null) xmlMethodNotFound(realThis, "setName");
                Object arg = (args.length != 0) ? args[0] : Undefined.instance;
                QName qname = lib.constructQName(cx, arg);
                xml.setName(qname);
                return Undefined.instance;
            }
            case Id_setNamespace: {
                if (xml == null) xmlMethodNotFound(realThis, "setNamespace");
                Namespace ns = lib.castToNamespace(cx, arg(args, 0));
                xml.setNamespace(ns);
                return Undefined.instance;
            }

            case Id_attribute: {
                XMLName xmlName = XMLName.create( lib.toNodeQName(cx, arg(args, 0), true), true, false );
                return realThis.getMatches(xmlName);
            }
            case Id_attributes:
                return realThis.getMatches(XMLName.create(XmlNode.QName.create(null, null), true, false));
            case Id_child: {
                XMLName xmlName = lib.toXMLNameOrIndex(cx, arg(args, 0));
                if (xmlName == null) {
                    //    Two billion or so is a fine upper limit, so we cast to int
                    int index = (int)ScriptRuntime.lastUint32Result(cx);
                    return realThis.child(index);
                } else {
                    return realThis.child(xmlName);
                }
            }
            case Id_children:
                return realThis.children();
            case Id_comments:
                return realThis.comments();
            case Id_contains:
                return ScriptRuntime.wrapBoolean(
                    realThis.contains(arg(args, 0)));
            case Id_copy:
                return realThis.copy();
            case Id_descendants: {
                XmlNode.QName qname = (args.length == 0) ? XmlNode.QName.create(null, null) : lib.toNodeQName(cx, args[0], false);
                return realThis.getMatches( XMLName.create(qname, false, true) );
            }
            case Id_elements: {
                XMLName xmlName = (args.length == 0)
                ? XMLName.formStar()
                : lib.toXMLName(cx, args[0]);
                return realThis.elements(xmlName);
            }
            case Id_hasOwnProperty: {
                XMLName xmlName = lib.toXMLName(cx, arg(args, 0));
                return ScriptRuntime.wrapBoolean(
                    realThis.hasOwnProperty(xmlName));
            }
            case Id_hasComplexContent:
                return ScriptRuntime.wrapBoolean(realThis.hasComplexContent());
            case Id_hasSimpleContent:
                return ScriptRuntime.wrapBoolean(realThis.hasSimpleContent());
            case Id_length:
                return ScriptRuntime.wrapInt(realThis.length());
            case Id_normalize:
                realThis.normalize();
                return Undefined.instance;
            case Id_parent:
                return realThis.parent();
            case Id_processingInstructions: {
                XMLName xmlName = (args.length > 0)
                ? lib.toXMLName(cx, args[0])
                : XMLName.formStar();
                return realThis.processingInstructions(xmlName);
            }
            case Id_propertyIsEnumerable: {
                return ScriptRuntime.wrapBoolean(
                    realThis.propertyIsEnumerable(arg(args, 0)));
            }
            case Id_text:
                return realThis.text();
            case Id_toString:
                return realThis.toString();
            case Id_toXMLString: {
                return realThis.toXMLString();
            }
            case Id_valueOf:
                return realThis.valueOf();
        }
        throw new IllegalArgumentException(String.valueOf(id));
    }

    private static Object arg(Object[] args, int i) {
        return (i < args.length) ? args[i] : Undefined.instance;
    }

    final XML newTextElementXML(XmlNode reference, XmlNode.QName qname, String value) {
        return lib.newTextElementXML(reference, qname, value);
    }

    /** @deprecated Hopefully this can be replaced with ecmaToXml below. */
    final XML newXMLFromJs(Object inputObject) {
        return lib.newXMLFromJs(inputObject);
    }

    final XML ecmaToXml(Object object) {
        return lib.ecmaToXml(object);
    }

    final String ecmaEscapeAttributeValue(String s) {
        //    TODO    Check this
        String quoted = lib.escapeAttributeValue(s);
        return quoted.substring(1, quoted.length() - 1);
    }

    final XML createEmptyXML() {
        return newXML(XmlNode.createEmpty(getProcessor()));
    }
}