489 lines
16 KiB
JavaScript
489 lines
16 KiB
JavaScript
import Tokenizer, { QuoteType } from "./Tokenizer.js";
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import { fromCodePoint } from "entities/lib/decode.js";
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const formTags = new Set([
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"input",
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"option",
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"optgroup",
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"select",
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"button",
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"datalist",
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"textarea",
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]);
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const pTag = new Set(["p"]);
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const tableSectionTags = new Set(["thead", "tbody"]);
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const ddtTags = new Set(["dd", "dt"]);
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const rtpTags = new Set(["rt", "rp"]);
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const openImpliesClose = new Map([
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["tr", new Set(["tr", "th", "td"])],
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["th", new Set(["th"])],
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["td", new Set(["thead", "th", "td"])],
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["body", new Set(["head", "link", "script"])],
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["li", new Set(["li"])],
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["p", pTag],
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["h1", pTag],
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["h2", pTag],
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["h3", pTag],
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["h4", pTag],
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["h5", pTag],
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["h6", pTag],
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["select", formTags],
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["input", formTags],
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["output", formTags],
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["button", formTags],
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["datalist", formTags],
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["textarea", formTags],
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["option", new Set(["option"])],
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["optgroup", new Set(["optgroup", "option"])],
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["dd", ddtTags],
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["dt", ddtTags],
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["address", pTag],
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["article", pTag],
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["aside", pTag],
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["blockquote", pTag],
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["details", pTag],
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["div", pTag],
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["dl", pTag],
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["fieldset", pTag],
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["figcaption", pTag],
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["figure", pTag],
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["footer", pTag],
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["form", pTag],
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["header", pTag],
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["hr", pTag],
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["main", pTag],
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["nav", pTag],
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["ol", pTag],
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["pre", pTag],
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["section", pTag],
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["table", pTag],
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["ul", pTag],
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["rt", rtpTags],
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["rp", rtpTags],
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["tbody", tableSectionTags],
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["tfoot", tableSectionTags],
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]);
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const voidElements = new Set([
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"area",
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"base",
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"basefont",
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"br",
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"col",
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"command",
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"embed",
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"frame",
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"hr",
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"img",
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"input",
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"isindex",
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"keygen",
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"link",
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"meta",
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"param",
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"source",
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"track",
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"wbr",
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]);
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const foreignContextElements = new Set(["math", "svg"]);
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const htmlIntegrationElements = new Set([
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"mi",
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"mo",
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"mn",
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"ms",
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"mtext",
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"annotation-xml",
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"foreignobject",
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"desc",
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"title",
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]);
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const reNameEnd = /\s|\//;
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export class Parser {
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constructor(cbs, options = {}) {
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var _a, _b, _c, _d, _e;
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this.options = options;
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/** The start index of the last event. */
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this.startIndex = 0;
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/** The end index of the last event. */
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this.endIndex = 0;
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/**
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* Store the start index of the current open tag,
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* so we can update the start index for attributes.
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*/
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this.openTagStart = 0;
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this.tagname = "";
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this.attribname = "";
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this.attribvalue = "";
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this.attribs = null;
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this.stack = [];
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this.foreignContext = [];
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this.buffers = [];
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this.bufferOffset = 0;
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/** The index of the last written buffer. Used when resuming after a `pause()`. */
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this.writeIndex = 0;
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/** Indicates whether the parser has finished running / `.end` has been called. */
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this.ended = false;
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this.cbs = cbs !== null && cbs !== void 0 ? cbs : {};
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this.lowerCaseTagNames = (_a = options.lowerCaseTags) !== null && _a !== void 0 ? _a : !options.xmlMode;
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this.lowerCaseAttributeNames =
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(_b = options.lowerCaseAttributeNames) !== null && _b !== void 0 ? _b : !options.xmlMode;
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this.tokenizer = new ((_c = options.Tokenizer) !== null && _c !== void 0 ? _c : Tokenizer)(this.options, this);
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(_e = (_d = this.cbs).onparserinit) === null || _e === void 0 ? void 0 : _e.call(_d, this);
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}
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// Tokenizer event handlers
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/** @internal */
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ontext(start, endIndex) {
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var _a, _b;
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const data = this.getSlice(start, endIndex);
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this.endIndex = endIndex - 1;
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(_b = (_a = this.cbs).ontext) === null || _b === void 0 ? void 0 : _b.call(_a, data);
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this.startIndex = endIndex;
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}
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/** @internal */
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ontextentity(cp) {
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var _a, _b;
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/*
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* Entities can be emitted on the character, or directly after.
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* We use the section start here to get accurate indices.
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*/
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const index = this.tokenizer.getSectionStart();
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this.endIndex = index - 1;
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(_b = (_a = this.cbs).ontext) === null || _b === void 0 ? void 0 : _b.call(_a, fromCodePoint(cp));
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this.startIndex = index;
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}
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isVoidElement(name) {
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return !this.options.xmlMode && voidElements.has(name);
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}
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/** @internal */
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onopentagname(start, endIndex) {
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this.endIndex = endIndex;
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let name = this.getSlice(start, endIndex);
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if (this.lowerCaseTagNames) {
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name = name.toLowerCase();
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}
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this.emitOpenTag(name);
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}
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emitOpenTag(name) {
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var _a, _b, _c, _d;
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this.openTagStart = this.startIndex;
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this.tagname = name;
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const impliesClose = !this.options.xmlMode && openImpliesClose.get(name);
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if (impliesClose) {
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while (this.stack.length > 0 &&
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impliesClose.has(this.stack[this.stack.length - 1])) {
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const element = this.stack.pop();
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(_b = (_a = this.cbs).onclosetag) === null || _b === void 0 ? void 0 : _b.call(_a, element, true);
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}
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}
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if (!this.isVoidElement(name)) {
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this.stack.push(name);
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if (foreignContextElements.has(name)) {
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this.foreignContext.push(true);
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}
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else if (htmlIntegrationElements.has(name)) {
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this.foreignContext.push(false);
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}
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}
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(_d = (_c = this.cbs).onopentagname) === null || _d === void 0 ? void 0 : _d.call(_c, name);
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if (this.cbs.onopentag)
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this.attribs = {};
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}
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endOpenTag(isImplied) {
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var _a, _b;
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this.startIndex = this.openTagStart;
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if (this.attribs) {
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(_b = (_a = this.cbs).onopentag) === null || _b === void 0 ? void 0 : _b.call(_a, this.tagname, this.attribs, isImplied);
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this.attribs = null;
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}
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if (this.cbs.onclosetag && this.isVoidElement(this.tagname)) {
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this.cbs.onclosetag(this.tagname, true);
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}
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this.tagname = "";
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}
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/** @internal */
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onopentagend(endIndex) {
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this.endIndex = endIndex;
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this.endOpenTag(false);
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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onclosetag(start, endIndex) {
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var _a, _b, _c, _d, _e, _f;
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this.endIndex = endIndex;
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let name = this.getSlice(start, endIndex);
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if (this.lowerCaseTagNames) {
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name = name.toLowerCase();
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}
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if (foreignContextElements.has(name) ||
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htmlIntegrationElements.has(name)) {
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this.foreignContext.pop();
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}
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if (!this.isVoidElement(name)) {
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const pos = this.stack.lastIndexOf(name);
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if (pos !== -1) {
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if (this.cbs.onclosetag) {
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let count = this.stack.length - pos;
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while (count--) {
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// We know the stack has sufficient elements.
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this.cbs.onclosetag(this.stack.pop(), count !== 0);
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}
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}
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else
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this.stack.length = pos;
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}
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else if (!this.options.xmlMode && name === "p") {
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// Implicit open before close
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this.emitOpenTag("p");
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this.closeCurrentTag(true);
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}
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}
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else if (!this.options.xmlMode && name === "br") {
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// We can't use `emitOpenTag` for implicit open, as `br` would be implicitly closed.
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(_b = (_a = this.cbs).onopentagname) === null || _b === void 0 ? void 0 : _b.call(_a, "br");
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(_d = (_c = this.cbs).onopentag) === null || _d === void 0 ? void 0 : _d.call(_c, "br", {}, true);
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(_f = (_e = this.cbs).onclosetag) === null || _f === void 0 ? void 0 : _f.call(_e, "br", false);
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}
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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onselfclosingtag(endIndex) {
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this.endIndex = endIndex;
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if (this.options.xmlMode ||
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this.options.recognizeSelfClosing ||
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this.foreignContext[this.foreignContext.length - 1]) {
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this.closeCurrentTag(false);
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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else {
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// Ignore the fact that the tag is self-closing.
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this.onopentagend(endIndex);
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}
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}
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closeCurrentTag(isOpenImplied) {
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var _a, _b;
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const name = this.tagname;
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this.endOpenTag(isOpenImplied);
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// Self-closing tags will be on the top of the stack
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if (this.stack[this.stack.length - 1] === name) {
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// If the opening tag isn't implied, the closing tag has to be implied.
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(_b = (_a = this.cbs).onclosetag) === null || _b === void 0 ? void 0 : _b.call(_a, name, !isOpenImplied);
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this.stack.pop();
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}
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}
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/** @internal */
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onattribname(start, endIndex) {
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this.startIndex = start;
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const name = this.getSlice(start, endIndex);
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this.attribname = this.lowerCaseAttributeNames
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? name.toLowerCase()
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: name;
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}
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/** @internal */
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onattribdata(start, endIndex) {
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this.attribvalue += this.getSlice(start, endIndex);
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}
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/** @internal */
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onattribentity(cp) {
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this.attribvalue += fromCodePoint(cp);
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}
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/** @internal */
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onattribend(quote, endIndex) {
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var _a, _b;
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this.endIndex = endIndex;
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(_b = (_a = this.cbs).onattribute) === null || _b === void 0 ? void 0 : _b.call(_a, this.attribname, this.attribvalue, quote === QuoteType.Double
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? '"'
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: quote === QuoteType.Single
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? "'"
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: quote === QuoteType.NoValue
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? undefined
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: null);
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if (this.attribs &&
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!Object.prototype.hasOwnProperty.call(this.attribs, this.attribname)) {
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this.attribs[this.attribname] = this.attribvalue;
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}
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this.attribvalue = "";
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}
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getInstructionName(value) {
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const index = value.search(reNameEnd);
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let name = index < 0 ? value : value.substr(0, index);
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if (this.lowerCaseTagNames) {
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name = name.toLowerCase();
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}
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return name;
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}
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/** @internal */
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ondeclaration(start, endIndex) {
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this.endIndex = endIndex;
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const value = this.getSlice(start, endIndex);
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if (this.cbs.onprocessinginstruction) {
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const name = this.getInstructionName(value);
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this.cbs.onprocessinginstruction(`!${name}`, `!${value}`);
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}
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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onprocessinginstruction(start, endIndex) {
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this.endIndex = endIndex;
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const value = this.getSlice(start, endIndex);
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if (this.cbs.onprocessinginstruction) {
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const name = this.getInstructionName(value);
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this.cbs.onprocessinginstruction(`?${name}`, `?${value}`);
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}
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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oncomment(start, endIndex, offset) {
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var _a, _b, _c, _d;
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this.endIndex = endIndex;
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(_b = (_a = this.cbs).oncomment) === null || _b === void 0 ? void 0 : _b.call(_a, this.getSlice(start, endIndex - offset));
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(_d = (_c = this.cbs).oncommentend) === null || _d === void 0 ? void 0 : _d.call(_c);
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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oncdata(start, endIndex, offset) {
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var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k;
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this.endIndex = endIndex;
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const value = this.getSlice(start, endIndex - offset);
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if (this.options.xmlMode || this.options.recognizeCDATA) {
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(_b = (_a = this.cbs).oncdatastart) === null || _b === void 0 ? void 0 : _b.call(_a);
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(_d = (_c = this.cbs).ontext) === null || _d === void 0 ? void 0 : _d.call(_c, value);
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(_f = (_e = this.cbs).oncdataend) === null || _f === void 0 ? void 0 : _f.call(_e);
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}
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else {
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(_h = (_g = this.cbs).oncomment) === null || _h === void 0 ? void 0 : _h.call(_g, `[CDATA[${value}]]`);
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(_k = (_j = this.cbs).oncommentend) === null || _k === void 0 ? void 0 : _k.call(_j);
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}
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// Set `startIndex` for next node
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this.startIndex = endIndex + 1;
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}
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/** @internal */
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onend() {
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var _a, _b;
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if (this.cbs.onclosetag) {
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// Set the end index for all remaining tags
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this.endIndex = this.startIndex;
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for (let index = this.stack.length; index > 0; this.cbs.onclosetag(this.stack[--index], true))
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;
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}
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(_b = (_a = this.cbs).onend) === null || _b === void 0 ? void 0 : _b.call(_a);
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}
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/**
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* Resets the parser to a blank state, ready to parse a new HTML document
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*/
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reset() {
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var _a, _b, _c, _d;
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(_b = (_a = this.cbs).onreset) === null || _b === void 0 ? void 0 : _b.call(_a);
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this.tokenizer.reset();
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this.tagname = "";
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this.attribname = "";
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this.attribs = null;
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this.stack.length = 0;
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this.startIndex = 0;
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this.endIndex = 0;
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(_d = (_c = this.cbs).onparserinit) === null || _d === void 0 ? void 0 : _d.call(_c, this);
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this.buffers.length = 0;
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this.bufferOffset = 0;
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this.writeIndex = 0;
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this.ended = false;
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}
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/**
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* Resets the parser, then parses a complete document and
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* pushes it to the handler.
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*
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* @param data Document to parse.
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*/
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parseComplete(data) {
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this.reset();
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this.end(data);
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}
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getSlice(start, end) {
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while (start - this.bufferOffset >= this.buffers[0].length) {
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this.shiftBuffer();
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}
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let slice = this.buffers[0].slice(start - this.bufferOffset, end - this.bufferOffset);
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while (end - this.bufferOffset > this.buffers[0].length) {
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this.shiftBuffer();
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slice += this.buffers[0].slice(0, end - this.bufferOffset);
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}
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return slice;
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}
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shiftBuffer() {
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this.bufferOffset += this.buffers[0].length;
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this.writeIndex--;
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this.buffers.shift();
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}
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/**
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* Parses a chunk of data and calls the corresponding callbacks.
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*
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* @param chunk Chunk to parse.
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*/
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write(chunk) {
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var _a, _b;
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if (this.ended) {
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(_b = (_a = this.cbs).onerror) === null || _b === void 0 ? void 0 : _b.call(_a, new Error(".write() after done!"));
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return;
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}
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this.buffers.push(chunk);
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if (this.tokenizer.running) {
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this.tokenizer.write(chunk);
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this.writeIndex++;
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}
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}
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/**
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* Parses the end of the buffer and clears the stack, calls onend.
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*
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* @param chunk Optional final chunk to parse.
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*/
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end(chunk) {
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var _a, _b;
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if (this.ended) {
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(_b = (_a = this.cbs).onerror) === null || _b === void 0 ? void 0 : _b.call(_a, new Error(".end() after done!"));
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return;
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}
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if (chunk)
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this.write(chunk);
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this.ended = true;
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this.tokenizer.end();
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}
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/**
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* Pauses parsing. The parser won't emit events until `resume` is called.
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*/
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pause() {
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this.tokenizer.pause();
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}
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/**
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* Resumes parsing after `pause` was called.
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*/
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resume() {
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this.tokenizer.resume();
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while (this.tokenizer.running &&
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this.writeIndex < this.buffers.length) {
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this.tokenizer.write(this.buffers[this.writeIndex++]);
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}
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if (this.ended)
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this.tokenizer.end();
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}
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/**
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* Alias of `write`, for backwards compatibility.
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*
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* @param chunk Chunk to parse.
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* @deprecated
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*/
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parseChunk(chunk) {
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this.write(chunk);
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}
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/**
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* Alias of `end`, for backwards compatibility.
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*
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* @param chunk Optional final chunk to parse.
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* @deprecated
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*/
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done(chunk) {
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this.end(chunk);
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}
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}
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//# sourceMappingURL=Parser.js.map
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