xmlname.java

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

        }
    }

    XMLList matchDescendantAttributes(XMLList rv, XML target) {
        rv.setTargets(target, null);
        addDescendantAttributes(rv, target);
        return rv;
    }

    XMLList matchDescendantChildren(XMLList rv, XML target) {
        rv.setTargets(target, null);
        addDescendantChildren(rv, target);
        return rv;
    }

    void addDescendants(XMLList rv, XML target) {
        XMLName xmlName = this;
        if (xmlName.isAttributeName()) {
            matchDescendantAttributes(rv, target);
        } else {
            matchDescendantChildren(rv, target);
        }
    }

    private void addAttributes(XMLList rv, XML target) {
        addMatchingAttributes(rv, target);
    }

    void addMatches(XMLList rv, XML target) {
        if (isDescendants()) {
            addDescendants(rv, target);
        } else if (isAttributeName()) {
            addAttributes(rv, target);
        } else {
            XML[] children = target.getChildren();
            if (children != null) {
                for (int i=0; i<children.length; i++) {
                    if (this.matches(children[i])) {
                        rv.addToList( children[i] );
                    }
                }
            }
            rv.setTargets(target, this.toQname());
        }
    }

    XMLList getMyValueOn(XML target) {
        XMLList rv = target.newXMLList();
        addMatches(rv, target);
        return rv;
    }

    void setMyValueOn(XML target, Object value) {
        // Special-case checks for undefined and null
        if (value == null) {
            value = "null";
        } else if (value instanceof Undefined) {
            value = "undefined";
        }

        XMLName xmlName = this;
        // Get the named property
        if (xmlName.isAttributeName()) {
            target.setAttribute(xmlName, value);
        } else if (xmlName.uri() == null && xmlName.localName().equals("*")) {
            target.setChildren(value);
        } else {
            // Convert text into XML if needed.
            XMLObjectImpl xmlValue = null;

            if (value instanceof XMLObjectImpl) {
                xmlValue = (XMLObjectImpl)value;

                // Check for attribute type and convert to textNode
                if (xmlValue instanceof XML) {
                    if (((XML)xmlValue).isAttribute()) {
                        xmlValue = target.makeXmlFromString(xmlName, xmlValue.toString());
                    }
                }

                if (xmlValue instanceof XMLList) {
                    for (int i = 0; i < xmlValue.length(); i++) {
                        XML xml = ((XMLList) xmlValue).item(i);

                        if (xml.isAttribute()) {
                            ((XMLList)xmlValue).replace(i, target.makeXmlFromString(xmlName, xml.toString()));
                        }
                    }
                }
            } else {
                xmlValue = target.makeXmlFromString(xmlName, ScriptRuntime.toString(value));
            }

            XMLList matches = target.getPropertyList(xmlName);

            if (matches.length() == 0) {
                target.appendChild(xmlValue);
            } else {
                // Remove all other matches
                for (int i = 1; i < matches.length(); i++) {
                    target.removeChild(matches.item(i).childIndex());
                }

                // Replace first match with new value.
                XML firstMatch = matches.item(0);
                target.replace(firstMatch.childIndex(), xmlValue);
            }
        }
    }

    public boolean has(Context cx) {
        if (xmlObject == null) {
            return false;
        }
        return xmlObject.hasXMLProperty(this);
    }

    public Object get(Context cx) {
        if (xmlObject == null) {
            throw ScriptRuntime.undefReadError(Undefined.instance,
                toString());
        }
        return xmlObject.getXMLProperty(this);
    }

    public Object set(Context cx, Object value) {
        if (xmlObject == null) {
            throw ScriptRuntime.undefWriteError(Undefined.instance,
                toString(),
                value);
        }
        // Assignment to descendants causes parse error on bad reference
        // and this should not be called
        if (isDescendants) throw Kit.codeBug();
        xmlObject.putXMLProperty(this, value);
        return value;
    }

    public boolean delete(Context cx) {
        if (xmlObject == null) {
            return true;
        }
        xmlObject.deleteXMLProperty(this);
        return !xmlObject.hasXMLProperty(this);
    }

    public String toString() {
        //return qname.localName();
        StringBuffer buff = new StringBuffer();
        if (isDescendants) buff.append("..");
        if (isAttributeName) buff.append('@');
        if (uri() == null) {
            buff.append('*');
            if(localName().equals("*")) {
                return buff.toString();
            }
        } else {
            buff.append('"').append(uri()).append('"');
        }
        buff.append(':').append(localName());
        return buff.toString();
    }

    final XmlNode.QName toQname() {
        return this.qname;
    }

    final boolean matchesLocalName(String localName) {
        return localName().equals("*") || localName().equals(localName);
    }

    final boolean matchesElement(XmlNode.QName qname) {
        if (this.uri() == null || this.uri().equals(qname.getNamespace().getUri())) {
            if (this.localName().equals("*") || this.localName().equals(qname.getLocalName())) {
                return true;
            }
        }
        return false;
    }

    final boolean matches(XML node) {
        XmlNode.QName qname = node.getNodeQname();
        String nodeUri = null;
        if (qname.getNamespace() != null) {
            nodeUri = qname.getNamespace().getUri();
        }
        if (isAttributeName) {
            if (node.isAttribute()) {
                if (this.uri() == null || this.uri().equals(nodeUri)) {
                    if (this.localName().equals("*") || this.localName().equals(qname.getLocalName())) {
                        return true;
                    }
                }
                return false;
            } else {
                //    TODO    Could throw exception maybe, should not call this method on attribute name with arbitrary node type
                //            unless we traverse all attributes and children habitually
                return false;
            }
        } else {
            if ( this.uri() == null || ((node.isElement()) && this.uri().equals(nodeUri)) ) {
                if (localName().equals("*")) return true;
                if (node.isElement()) {
                    if (localName().equals(qname.getLocalName())) return true;
                }
            }
            return false;
        }
    }

    /**    @deprecated */
    boolean isAttributeName() {
        return isAttributeName;
    }

    //    TODO    Fix whether this is an attribute XMLName at construction?
    /** @deprecated */
    void setAttributeName() {
//        if (isAttributeName) throw new IllegalStateException();
        isAttributeName = true;
    }

    /**    @deprecated */
    boolean isDescendants() {
        return isDescendants;
    }

    //    TODO    Fix whether this is an descendant XMLName at construction?
    /** @deprecated */
    void setIsDescendants() {
//        if (isDescendants) throw new IllegalStateException();
        isDescendants = true;
    }
}