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Mini Shell
Mini Shell
import { ElementType } from "domelementtype";
import { Element, Text, Comment, CDATA, Document, ProcessingInstruction, } from "./node.js";
export * from "./node.js";
// Default options
const defaultOpts = {
withStartIndices: false,
withEndIndices: false,
xmlMode: false,
};
export class DomHandler {
/**
* @param callback Called once parsing has completed.
* @param options Settings for the handler.
* @param elementCB Callback whenever a tag is closed.
*/
constructor(callback, options, elementCB) {
/** The elements of the DOM */
this.dom = [];
/** The root element for the DOM */
this.root = new 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;
}
onparserinit(parser) {
this.parser = parser;
}
// Resets the handler back to starting state
onreset() {
this.dom = [];
this.root = new Document(this.dom);
this.done = false;
this.tagStack = [this.root];
this.lastNode = null;
this.parser = null;
}
// Signals the handler that parsing is done
onend() {
if (this.done)
return;
this.done = true;
this.parser = null;
this.handleCallback(null);
}
onerror(error) {
this.handleCallback(error);
}
onclosetag() {
this.lastNode = null;
const elem = this.tagStack.pop();
if (this.options.withEndIndices) {
elem.endIndex = this.parser.endIndex;
}
if (this.elementCB)
this.elementCB(elem);
}
onopentag(name, attribs) {
const type = this.options.xmlMode ? ElementType.Tag : undefined;
const element = new Element(name, attribs, undefined, type);
this.addNode(element);
this.tagStack.push(element);
}
ontext(data) {
const { lastNode } = this;
if (lastNode && lastNode.type === ElementType.Text) {
lastNode.data += data;
if (this.options.withEndIndices) {
lastNode.endIndex = this.parser.endIndex;
}
}
else {
const node = new Text(data);
this.addNode(node);
this.lastNode = node;
}
}
oncomment(data) {
if (this.lastNode && this.lastNode.type === ElementType.Comment) {
this.lastNode.data += data;
return;
}
const node = new Comment(data);
this.addNode(node);
this.lastNode = node;
}
oncommentend() {
this.lastNode = null;
}
oncdatastart() {
const text = new Text("");
const node = new CDATA([text]);
this.addNode(node);
text.parent = node;
this.lastNode = text;
}
oncdataend() {
this.lastNode = null;
}
onprocessinginstruction(name, data) {
const node = new ProcessingInstruction(name, data);
this.addNode(node);
}
handleCallback(error) {
if (typeof this.callback === "function") {
this.callback(error, this.dom);
}
else if (error) {
throw error;
}
}
addNode(node) {
const parent = this.tagStack[this.tagStack.length - 1];
const 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;
}
}
export default DomHandler;
Zerion Mini Shell 1.0