# All files index.ts

81.82% Statements 90/110
76% Branches 38/50
76.47% Functions 13/17
82.69% Lines 86/104

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     import { ElementType } from "domelementtype";
    import {
        Node,
        Element,
        DataNode,
        NodeWithChildren,
        ProcessingInstruction
    } from "./node";

    export { Node, NodeWithChildren, DataNode, Element };

    const reWhitespace = /\s+/g;

    export interface DomHandlerOptions {
        /***
         * Indicates whether the whitespace in text nodes should be normalized
         * (= all whitespace should be replaced with single spaces). The default value is "false".
         */
        normalizeWhitespace?: boolean;

        /***
         * Indicates whether a startIndex property will be added to nodes.
         * When the parser is used in a non-streaming fashion, startIndex is an integer
         * indicating the position of the start of the node in the document.
         * The default value is "false".
         */
        withStartIndices?: boolean;

        /***
         * Indicates whether a endIndex property will be added to nodes.
         * When the parser is used in a non-streaming fashion, endIndex is an integer
         * indicating the position of the end of the node in the document.
         * The default value is "false".
         */
        withEndIndices?: boolean;
    }

    // Default options
    const defaultOpts: DomHandlerOptions = {
        normalizeWhitespace: false,
        withStartIndices: false,
        withEndIndices: false
    };

    interface ParserInterface {
        startIndex: number | null;
        endIndex: number | null;
    }

    type Callback = (error: Error | null, dom: Node[]) => void;
    type ElementCallback = (element: Element) => void;

    export class DomHandler {
        /** The constructed DOM */
        public dom: Node[] = [];

        /** Called once parsing has completed. */
        private _callback: Callback | null;

        /** Settings for the handler. */
        private _options: DomHandlerOptions;

        /** Callback whenever a tag is closed. */
        private _elementCB: ElementCallback | null;

        /** Indicated whether parsing has been completed. */
        private _done: boolean = false;

        /** Stack of open tags. */
        private _tagStack: Element[] = [];

        /** A data node that is still being written to. */
        private _lastNode: DataNode | null = null;

        /** Reference to the parser instance. Used for location information. */
        private _parser: ParserInterface | null = null;

        /**
         * Initiate a new DomHandler.
         *
         * @param callback Called once parsing has completed.
         * @param options Settings for the handler.
         * @param elementCB Callback whenever a tag is closed.
         */
        public constructor(
            callback?: Callback | null,
            options?: DomHandlerOptions | null,
            elementCB?: ElementCallback
        ) {
            // Make it possible to skip arguments, for backwards-compatibility
            Iif (typeof options === "function") {
                elementCB = options;
                options = defaultOpts;
            }
            Iif (typeof callback === "object") {
                options = callback;
                callback = undefined;
            }

            this._callback = callback || null;
            this._options = options || defaultOpts;
            this._elementCB = elementCB || null;
        }

        public onparserinit(parser: ParserInterface): void {
            this._parser = parser;
        }

        // Resets the handler back to starting state
        public onreset(): void {
            this.dom = [];
            this._done = false;
            this._tagStack = [];
            this._lastNode = null;
            this._parser = this._parser || null;
        }

        // Signals the handler that parsing is done
        public onend(): void {
            Iif (this._done) return;
            this._done = true;
            this._parser = null;
            this.handleCallback(null);
        }

        public onerror(error: Error): void {
            this.handleCallback(error);
        }

        public onclosetag(): void {
            this._lastNode = null;

            // If(this._tagStack.pop().name !== name) this.handleCallback(Error("Tagname didn't match!"));
            const elem = this._tagStack.pop();

            Iif (!elem || !this._parser) {
                return;
            }

            if (this._options.withEndIndices) {
                elem.endIndex = this._parser.endIndex;
            }

            Iif (this._elementCB) this._elementCB(elem);
        }

        public onopentag(name: string, attribs: { [key: string]: string }): void {
            const element = new Element(name, attribs);
            this.addNode(element);
            this._tagStack.push(element);
        }

        public ontext(data: string): void {
            const normalize = this._options.normalizeWhitespace;

            const { _lastNode } = this;

            if (_lastNode && _lastNode.type === ElementType.Text) {
                if (normalize) {
                    _lastNode.data = (_lastNode.data + data).replace(
                        reWhitespace,
                        " "
                    );
                } else {
                    _lastNode.data += data;
                }
            } else {
                if (normalize) {
                    data = data.replace(reWhitespace, " ");
                }

                const node = new DataNode(ElementType.Text, data);
                this.addNode(node);
                this._lastNode = node;
            }
        }

        public oncomment(data: string): void {
            Iif (this._lastNode && this._lastNode.type === ElementType.Comment) {
                this._lastNode.data += data;
                return;
            }

            const node = new DataNode(ElementType.Comment, data);
            this.addNode(node);
            this._lastNode = node;
        }

        public oncommentend(): void {
            this._lastNode = null;
        }

        public oncdatastart(): void {
            const text = new DataNode(ElementType.Text, "");
            const node = new NodeWithChildren(ElementType.CDATA, [text]);

            this.addNode(node);

            text.parent = node;
            this._lastNode = text;
        }

        public oncdataend(): void {
            this._lastNode = null;
        }

        public onprocessinginstruction(name: string, data: string): void {
            const node = new ProcessingInstruction(name, data);
            this.addNode(node);
        }

        protected handleCallback(error: Error | null): void {
            Eif (typeof this._callback === "function") {
                this._callback(error, this.dom);
            } else if (error) {
                throw error;
            }
        }

        protected addNode(node: Node) {
            const parent = this._tagStack[this._tagStack.length - 1];
            const siblings = parent ? parent.children : this.dom;
            const previousSibling = siblings[siblings.length - 1];

            Eif (this._parser) {
                if (this._options.withStartIndices) {
                    node.startIndex = this._parser.startIndex;
                }

                if (this._options.withEndIndices) {
                    node.endIndex = this._parser.endIndex;
                }
            }

            siblings.push(node);

            if (previousSibling) {
                node.prev = previousSibling;
                previousSibling.next = node;
            }

            if (parent) {
                node.parent = parent;
            }

            this._lastNode = null;
        }

        protected addDataNode(node: DataNode): void {
            this.addNode(node);
            this._lastNode = node;
        }
    }

    export default DomHandler;