xmllibimpl.java

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

        return xmlName;
    }

    Namespace castToNamespace(Context cx, Object namespaceObj) {
        return this.namespacePrototype.castToNamespace(namespaceObj);
    }

    private String getDefaultNamespaceURI(Context cx) {
        return getDefaultNamespace(cx).uri();
    }

    Namespace newNamespace(String uri) {
        return this.namespacePrototype.newNamespace(uri);
    }

    Namespace getDefaultNamespace(Context cx) {
        if (cx == null) {
            cx = Context.getCurrentContext();
            if (cx == null) {
                return namespacePrototype;
            }
        }

        Object ns = ScriptRuntime.searchDefaultNamespace(cx);
        if (ns == null) {
            return namespacePrototype;
        } else {
            if (ns instanceof Namespace) {
                return (Namespace)ns;
            } else {
                //    TODO    Clarify or remove the following comment
                // Should not happen but for now it could
                // due to bad searchDefaultNamespace implementation.
                return namespacePrototype;
            }
        }
    }

    Namespace[] createNamespaces(XmlNode.Namespace[] declarations) {
        Namespace[] rv = new Namespace[declarations.length];
        for (int i=0; i<declarations.length; i++) {
            rv[i] = this.namespacePrototype.newNamespace(declarations[i].getPrefix(), declarations[i].getUri());
        }
        return rv;
    }

    //    See ECMA357 13.3.2
    QName constructQName(Context cx, Object namespace, Object name) {
        return this.qnamePrototype.constructQName(this, cx, namespace, name);
    }

    QName newQName(String uri, String localName, String prefix) {
        return this.qnamePrototype.newQName(this, uri, localName, prefix);
    }

    QName constructQName(Context cx, Object nameValue) {
//        return constructQName(cx, Undefined.instance, nameValue);
        return this.qnamePrototype.constructQName(this, cx, nameValue);
    }

    QName castToQName(Context cx, Object qnameValue) {
        return this.qnamePrototype.castToQName(this, cx, qnameValue);
    }

    QName newQName(XmlNode.QName qname) {
        return QName.create(this, this.globalScope, this.qnamePrototype, qname);
    }

    XML newXML(XmlNode node) {
        return new XML(this, this.globalScope, this.xmlPrototype, node);
    }

    /**
        @deprecated I believe this can be replaced by ecmaToXml below.
     */
    final XML newXMLFromJs(Object inputObject) {
        String frag;

        if (inputObject == null || inputObject == Undefined.instance) {
            frag = "";
        } else if (inputObject instanceof XMLObjectImpl) {
            // todo: faster way for XMLObjects?
            frag = ((XMLObjectImpl) inputObject).toXMLString();
        } else {
            frag = ScriptRuntime.toString(inputObject);
        }

        if (frag.trim().startsWith("<>")) {
            throw ScriptRuntime.typeError("Invalid use of XML object anonymous tags <></>.");
        }

        if (frag.indexOf("<") == -1) {
            //    Solo text node
            return newXML(XmlNode.createText(options, frag));
        }
        return parse(frag);
    }

    private XML parse(String frag) {
        try {
            return newXML(XmlNode.createElement(options, getDefaultNamespaceURI(Context.getCurrentContext()), frag));
        } catch (org.xml.sax.SAXException e) {
            throw ScriptRuntime.typeError("Cannot parse XML: " + e.getMessage());
        }
    }

    final XML ecmaToXml(Object object) {
        //    See ECMA357 10.3
        if (object == null || object == Undefined.instance) throw ScriptRuntime.typeError("Cannot convert " + object + " to XML");
        if (object instanceof XML) return (XML)object;
        if (object instanceof XMLList) {
            XMLList list = (XMLList)object;
            if (list.getXML() != null) {
                return list.getXML();
            } else {
                throw ScriptRuntime.typeError("Cannot convert list of >1 element to XML");
            }
        }
        //    TODO    Technically we should fail on anything except a String, Number or Boolean
        //            See ECMA357 10.3
        // Extension: if object is a DOM node, use that to construct the XML
        // object.
        if (object instanceof Wrapper) {
            object = ((Wrapper) object).unwrap();
        }
        if (object instanceof org.w3c.dom.Node) {
            org.w3c.dom.Node node = (org.w3c.dom.Node) object;
            return newXML(XmlNode.createElementFromNode(node));
        }
        //    Instead we just blindly cast to a String and let them convert anything.
        String s = ScriptRuntime.toString(object);
        //    TODO    Could this get any uglier?
        if (s.length() > 0 && s.charAt(0) == '<') {
            return parse(s);
        } else {
            return newXML(XmlNode.createText(options, s));
        }
    }

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

    XMLList newXMLList() {
        return new XMLList(this, this.globalScope, this.xmlListPrototype);
    }

    final XMLList newXMLListFrom(Object inputObject) {
        XMLList rv = newXMLList();

        if (inputObject == null || inputObject instanceof Undefined) {
            return rv;
        } else if (inputObject instanceof XML) {
            XML xml = (XML) inputObject;
            rv.getNodeList().add(xml);
            return rv;
        } else if (inputObject instanceof XMLList) {
            XMLList xmll = (XMLList) inputObject;
            rv.getNodeList().add(xmll.getNodeList());
            return rv;
        } else {
            String frag = ScriptRuntime.toString(inputObject).trim();

            if (!frag.startsWith("<>")) {
                frag = "<>" + frag + "</>";
            }

            frag = "<fragment>" + frag.substring(2);
            if (!frag.endsWith("</>")) {
                throw ScriptRuntime.typeError("XML with anonymous tag missing end anonymous tag");
            }

            frag = frag.substring(0, frag.length() - 3) + "</fragment>";

            XML orgXML = newXMLFromJs(frag);

            // Now orphan the children and add them to our XMLList.
            XMLList children = orgXML.children();

            for (int i = 0; i < children.getNodeList().length(); i++) {
                // Copy here is so that they'll be orphaned (parent() will be undefined)
                rv.getNodeList().add(((XML) children.item(i).copy()));
            }
            return rv;
        }
    }

    XmlNode.QName toNodeQName(Context cx, Object namespaceValue, Object nameValue) {
        // This is duplication of constructQName(cx, namespaceValue, nameValue)
        // but for XMLName

        String localName;

        if (nameValue instanceof QName) {
            QName qname = (QName)nameValue;
            localName = qname.localName();
        } else {
            localName = ScriptRuntime.toString(nameValue);
        }

        XmlNode.Namespace ns;
        if (namespaceValue == Undefined.instance) {
            if ("*".equals(localName)) {
                ns = null;
            } else {
                ns = getDefaultNamespace(cx).getDelegate();
            }
        } else if (namespaceValue == null) {
            ns = null;
        } else if (namespaceValue instanceof Namespace) {
            ns = ((Namespace)namespaceValue).getDelegate();
        } else {
            ns = this.namespacePrototype.constructNamespace(namespaceValue).getDelegate();
        }

        if (localName != null && localName.equals("*")) localName = null;
        return XmlNode.QName.create(ns, localName);
    }

    XmlNode.QName toNodeQName(Context cx, String name, boolean attribute) {
        XmlNode.Namespace defaultNamespace = getDefaultNamespace(cx).getDelegate();
        if (name != null && name.equals("*")) {
            return XmlNode.QName.create(null, null);
        } else {
            if (attribute) {
                return XmlNode.QName.create(XmlNode.Namespace.GLOBAL, name);
            } else {
                return XmlNode.QName.create(defaultNamespace, name);
            }
        }
    }

    /**
        @deprecated Too general; this should be split into overloaded methods.
        Is that possible?
     */
    XmlNode.QName toNodeQName(Context cx, Object nameValue, boolean attribute) {
        if (nameValue instanceof XMLName) {
            return ((XMLName)nameValue).toQname();
        } else if (nameValue instanceof QName) {
            QName qname = (QName)nameValue;
            return qname.getDelegate();
        } else if (
            nameValue instanceof Boolean
            || nameValue instanceof Number
            || nameValue == Undefined.instance
            || nameValue == null
        ) {
            throw badXMLName(nameValue);
        } else {
            String local = null;
            if (nameValue instanceof String) {
                local = (String)nameValue;
            } else {
                local = ScriptRuntime.toString(nameValue);
            }
            return toNodeQName(cx, local, attribute);
        }
    }

    //
    //    Override methods from XMLLib
    //

    public boolean isXMLName(Context _cx, Object nameObj) {
        return XMLName.accept(nameObj);
    }

    public Object toDefaultXmlNamespace(Context cx, Object uriValue) {
        return this.namespacePrototype.constructNamespace(uriValue);
    }

    public String escapeTextValue(Object o) {
        return options.escapeTextValue(o);
    }

    public String escapeAttributeValue(Object o) {
        return options.escapeAttributeValue(o);
    }

    public Ref nameRef(Context cx, Object name, Scriptable scope, int memberTypeFlags) {
        if ((memberTypeFlags & Node.ATTRIBUTE_FLAG) == 0) {
            // should only be called foir cases like @name or @[expr]
            throw Kit.codeBug();
        }
        XMLName xmlName = toAttributeName(cx, name);
        return xmlPrimaryReference(cx, xmlName, scope);
    }

    public Ref nameRef(Context cx, Object namespace, Object name, Scriptable scope, int memberTypeFlags) {
        XMLName xmlName = XMLName.create(toNodeQName(cx, namespace, name), false, false);

        //    No idea what is coming in from the parser in this case; is it detecting the "@"?
        if ((memberTypeFlags & Node.ATTRIBUTE_FLAG) != 0) {
            if (!xmlName.isAttributeName()) {
                xmlName.setAttributeName();
            }
        }

        return xmlPrimaryReference(cx, xmlName, scope);
    }
}