sulibao-mini/components/agent-ui/markdownPreview/towxml/parse/parse2/domhandler/index.js

var domelementtype_1 = require('../domelementtype/index.js');
var node_js_1 = require('./node.js');
var defaultOpts = {
    withStartIndices: false,
    withEndIndices: false,
    xmlMode: false
};
var DomHandler = /** @class */ (function () {
    /**
     * @param callback Called once parsing has completed.
     * @param options Settings for the handler.
     * @param elementCB Callback whenever a tag is closed.
     */
    function DomHandler(callback, options, elementCB) {
        /** The elements of the DOM */
        this.dom = [];
        /** The root element for the DOM */
        this.root = new node_js_1.Document(this.dom);
        /** Indicated whether parsing has been completed. */
        this.done = false;
        /** Stack of open tags. */
        this.tagStack = [this.root];
        /** A data node that is still being written to. */
        this.lastNode = null;
        /** Reference to the parser instance. Used for location information. */
        this.parser = null;
        // Make it possible to skip arguments, for backwards-compatibility
        if (typeof options === 'function') {
            elementCB = options;
            options = defaultOpts;
        }
        if (typeof callback === 'object') {
            options = callback;
            callback = undefined;
        }
        this.callback = callback !== null && callback !== void 0 ? callback : null;
        this.options = options !== null && options !== void 0 ? options : defaultOpts;
        this.elementCB = elementCB !== null && elementCB !== void 0 ? elementCB : null;
    }
    DomHandler.prototype.onparserinit = function (parser) {
        this.parser = parser;
    };
    // Resets the handler back to starting state
    DomHandler.prototype.onreset = function () {
        this.dom = [];
        this.root = new node_js_1.Document(this.dom);
        this.done = false;
        this.tagStack = [this.root];
        this.lastNode = null;
        this.parser = null;
    };
    // Signals the handler that parsing is done
    DomHandler.prototype.onend = function () {
        if (this.done) {
            return;
        }
        this.done = true;
        this.parser = null;
        this.handleCallback(null);
    };
    DomHandler.prototype.onerror = function (error) {
        this.handleCallback(error);
    };
    DomHandler.prototype.onclosetag = function () {
        this.lastNode = null;
        var elem = this.tagStack.pop();
        if (this.options.withEndIndices) {
            elem.endIndex = this.parser.endIndex;
        }
        if (this.elementCB) {
            this.elementCB(elem);
        }
    };
    DomHandler.prototype.onopentag = function (name, attribs) {
        var type = this.options.xmlMode ? domelementtype_1.ElementType.Tag : undefined;
        var element = new node_js_1.Element(name, attribs, undefined, type);
        this.addNode(element);
        this.tagStack.push(element);
    };
    DomHandler.prototype.ontext = function (data) {
        var lastNode = this.lastNode;
        if (lastNode && lastNode.type === domelementtype_1.ElementType.Text) {
            lastNode.data += data;
            if (this.options.withEndIndices) {
                lastNode.endIndex = this.parser.endIndex;
            }
        } else {
            var node = new node_js_1.Text(data);
            this.addNode(node);
            this.lastNode = node;
        }
    };
    DomHandler.prototype.oncomment = function (data) {
        if (this.lastNode && this.lastNode.type === domelementtype_1.ElementType.Comment) {
            this.lastNode.data += data;
            return;
        }
        var node = new node_js_1.Comment(data);
        this.addNode(node);
        this.lastNode = node;
    };
    DomHandler.prototype.oncommentend = function () {
        this.lastNode = null;
    };
    DomHandler.prototype.oncdatastart = function () {
        var text = new node_js_1.Text('');
        var node = new node_js_1.CDATA([text]);
        this.addNode(node);
        text.parent = node;
        this.lastNode = text;
    };
    DomHandler.prototype.oncdataend = function () {
        this.lastNode = null;
    };
    DomHandler.prototype.onprocessinginstruction = function (name, data) {
        var node = new node_js_1.ProcessingInstruction(name, data);
        this.addNode(node);
    };
    DomHandler.prototype.handleCallback = function (error) {
        if (typeof this.callback === 'function') {
            this.callback(error, this.dom);
        } else if (error) {
            throw error;
        }
    };
    DomHandler.prototype.addNode = function (node) {
        var parent = this.tagStack[this.tagStack.length - 1];
        var previousSibling = parent.children[parent.children.length - 1];
        if (this.options.withStartIndices) {
            node.startIndex = this.parser.startIndex;
        }
        if (this.options.withEndIndices) {
            node.endIndex = this.parser.endIndex;
        }
        parent.children.push(node);
        if (previousSibling) {
            node.prev = previousSibling;
            previousSibling.next = node;
        }
        node.parent = parent;
        this.lastNode = null;
    };
    return DomHandler;
})();
module.exports = DomHandler;