مشاهدة ملف: Parser.js

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