536 lines
		
	
	
		
			22 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			536 lines
		
	
	
		
			22 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
"use strict";
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var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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    if (k2 === undefined) k2 = k;
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    var desc = Object.getOwnPropertyDescriptor(m, k);
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    if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
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      desc = { enumerable: true, get: function() { return m[k]; } };
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    }
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    Object.defineProperty(o, k2, desc);
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}) : (function(o, m, k, k2) {
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    if (k2 === undefined) k2 = k;
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    o[k2] = m[k];
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}));
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var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
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    Object.defineProperty(o, "default", { enumerable: true, value: v });
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}) : function(o, v) {
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    o["default"] = v;
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});
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var __importStar = (this && this.__importStar) || function (mod) {
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    if (mod && mod.__esModule) return mod;
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    var result = {};
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    if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
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    __setModuleDefault(result, mod);
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    return result;
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};
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var __importDefault = (this && this.__importDefault) || function (mod) {
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    return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.decodeXML = exports.decodeHTMLStrict = exports.decodeHTMLAttribute = exports.decodeHTML = exports.determineBranch = exports.EntityDecoder = exports.DecodingMode = exports.BinTrieFlags = exports.fromCodePoint = exports.replaceCodePoint = exports.decodeCodePoint = exports.xmlDecodeTree = exports.htmlDecodeTree = void 0;
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var decode_data_html_js_1 = __importDefault(require("./generated/decode-data-html.js"));
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exports.htmlDecodeTree = decode_data_html_js_1.default;
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var decode_data_xml_js_1 = __importDefault(require("./generated/decode-data-xml.js"));
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exports.xmlDecodeTree = decode_data_xml_js_1.default;
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var decode_codepoint_js_1 = __importStar(require("./decode_codepoint.js"));
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exports.decodeCodePoint = decode_codepoint_js_1.default;
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var decode_codepoint_js_2 = require("./decode_codepoint.js");
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Object.defineProperty(exports, "replaceCodePoint", { enumerable: true, get: function () { return decode_codepoint_js_2.replaceCodePoint; } });
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Object.defineProperty(exports, "fromCodePoint", { enumerable: true, get: function () { return decode_codepoint_js_2.fromCodePoint; } });
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var CharCodes;
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(function (CharCodes) {
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    CharCodes[CharCodes["NUM"] = 35] = "NUM";
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    CharCodes[CharCodes["SEMI"] = 59] = "SEMI";
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    CharCodes[CharCodes["EQUALS"] = 61] = "EQUALS";
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    CharCodes[CharCodes["ZERO"] = 48] = "ZERO";
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    CharCodes[CharCodes["NINE"] = 57] = "NINE";
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    CharCodes[CharCodes["LOWER_A"] = 97] = "LOWER_A";
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    CharCodes[CharCodes["LOWER_F"] = 102] = "LOWER_F";
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    CharCodes[CharCodes["LOWER_X"] = 120] = "LOWER_X";
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    CharCodes[CharCodes["LOWER_Z"] = 122] = "LOWER_Z";
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    CharCodes[CharCodes["UPPER_A"] = 65] = "UPPER_A";
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    CharCodes[CharCodes["UPPER_F"] = 70] = "UPPER_F";
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    CharCodes[CharCodes["UPPER_Z"] = 90] = "UPPER_Z";
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})(CharCodes || (CharCodes = {}));
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/** Bit that needs to be set to convert an upper case ASCII character to lower case */
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var TO_LOWER_BIT = 32;
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var BinTrieFlags;
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(function (BinTrieFlags) {
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    BinTrieFlags[BinTrieFlags["VALUE_LENGTH"] = 49152] = "VALUE_LENGTH";
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    BinTrieFlags[BinTrieFlags["BRANCH_LENGTH"] = 16256] = "BRANCH_LENGTH";
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    BinTrieFlags[BinTrieFlags["JUMP_TABLE"] = 127] = "JUMP_TABLE";
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})(BinTrieFlags = exports.BinTrieFlags || (exports.BinTrieFlags = {}));
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function isNumber(code) {
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    return code >= CharCodes.ZERO && code <= CharCodes.NINE;
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}
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function isHexadecimalCharacter(code) {
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    return ((code >= CharCodes.UPPER_A && code <= CharCodes.UPPER_F) ||
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        (code >= CharCodes.LOWER_A && code <= CharCodes.LOWER_F));
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}
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function isAsciiAlphaNumeric(code) {
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    return ((code >= CharCodes.UPPER_A && code <= CharCodes.UPPER_Z) ||
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        (code >= CharCodes.LOWER_A && code <= CharCodes.LOWER_Z) ||
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        isNumber(code));
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}
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/**
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 * Checks if the given character is a valid end character for an entity in an attribute.
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 *
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 * Attribute values that aren't terminated properly aren't parsed, and shouldn't lead to a parser error.
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 * See the example in https://html.spec.whatwg.org/multipage/parsing.html#named-character-reference-state
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 */
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function isEntityInAttributeInvalidEnd(code) {
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    return code === CharCodes.EQUALS || isAsciiAlphaNumeric(code);
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}
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var EntityDecoderState;
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(function (EntityDecoderState) {
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    EntityDecoderState[EntityDecoderState["EntityStart"] = 0] = "EntityStart";
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    EntityDecoderState[EntityDecoderState["NumericStart"] = 1] = "NumericStart";
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    EntityDecoderState[EntityDecoderState["NumericDecimal"] = 2] = "NumericDecimal";
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    EntityDecoderState[EntityDecoderState["NumericHex"] = 3] = "NumericHex";
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    EntityDecoderState[EntityDecoderState["NamedEntity"] = 4] = "NamedEntity";
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})(EntityDecoderState || (EntityDecoderState = {}));
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var DecodingMode;
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(function (DecodingMode) {
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    /** Entities in text nodes that can end with any character. */
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    DecodingMode[DecodingMode["Legacy"] = 0] = "Legacy";
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    /** Only allow entities terminated with a semicolon. */
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    DecodingMode[DecodingMode["Strict"] = 1] = "Strict";
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    /** Entities in attributes have limitations on ending characters. */
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    DecodingMode[DecodingMode["Attribute"] = 2] = "Attribute";
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})(DecodingMode = exports.DecodingMode || (exports.DecodingMode = {}));
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/**
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 * Token decoder with support of writing partial entities.
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 */
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var EntityDecoder = /** @class */ (function () {
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    function EntityDecoder(
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    /** The tree used to decode entities. */
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    decodeTree, 
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    /**
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     * The function that is called when a codepoint is decoded.
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     *
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     * For multi-byte named entities, this will be called multiple times,
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     * with the second codepoint, and the same `consumed` value.
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     *
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     * @param codepoint The decoded codepoint.
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     * @param consumed The number of bytes consumed by the decoder.
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     */
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    emitCodePoint, 
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    /** An object that is used to produce errors. */
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    errors) {
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        this.decodeTree = decodeTree;
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        this.emitCodePoint = emitCodePoint;
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        this.errors = errors;
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        /** The current state of the decoder. */
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        this.state = EntityDecoderState.EntityStart;
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        /** Characters that were consumed while parsing an entity. */
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        this.consumed = 1;
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        /**
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         * The result of the entity.
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         *
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         * Either the result index of a numeric entity, or the codepoint of a
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         * numeric entity.
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         */
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        this.result = 0;
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        /** The current index in the decode tree. */
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        this.treeIndex = 0;
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        /** The number of characters that were consumed in excess. */
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        this.excess = 1;
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        /** The mode in which the decoder is operating. */
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        this.decodeMode = DecodingMode.Strict;
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    }
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    /** Resets the instance to make it reusable. */
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    EntityDecoder.prototype.startEntity = function (decodeMode) {
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        this.decodeMode = decodeMode;
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        this.state = EntityDecoderState.EntityStart;
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        this.result = 0;
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        this.treeIndex = 0;
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        this.excess = 1;
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        this.consumed = 1;
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    };
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    /**
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     * Write an entity to the decoder. This can be called multiple times with partial entities.
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     * If the entity is incomplete, the decoder will return -1.
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     *
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     * Mirrors the implementation of `getDecoder`, but with the ability to stop decoding if the
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     * entity is incomplete, and resume when the next string is written.
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     *
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     * @param string The string containing the entity (or a continuation of the entity).
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     * @param offset The offset at which the entity begins. Should be 0 if this is not the first call.
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     * @returns The number of characters that were consumed, or -1 if the entity is incomplete.
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     */
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    EntityDecoder.prototype.write = function (str, offset) {
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        switch (this.state) {
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            case EntityDecoderState.EntityStart: {
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                if (str.charCodeAt(offset) === CharCodes.NUM) {
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                    this.state = EntityDecoderState.NumericStart;
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                    this.consumed += 1;
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                    return this.stateNumericStart(str, offset + 1);
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                }
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                this.state = EntityDecoderState.NamedEntity;
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                return this.stateNamedEntity(str, offset);
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            }
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            case EntityDecoderState.NumericStart: {
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                return this.stateNumericStart(str, offset);
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            }
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            case EntityDecoderState.NumericDecimal: {
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                return this.stateNumericDecimal(str, offset);
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            }
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            case EntityDecoderState.NumericHex: {
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                return this.stateNumericHex(str, offset);
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            }
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            case EntityDecoderState.NamedEntity: {
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                return this.stateNamedEntity(str, offset);
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            }
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        }
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    };
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    /**
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     * Switches between the numeric decimal and hexadecimal states.
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     *
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     * Equivalent to the `Numeric character reference state` in the HTML spec.
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     *
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     * @param str The string containing the entity (or a continuation of the entity).
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     * @param offset The current offset.
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     * @returns The number of characters that were consumed, or -1 if the entity is incomplete.
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     */
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    EntityDecoder.prototype.stateNumericStart = function (str, offset) {
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        if (offset >= str.length) {
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            return -1;
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        }
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        if ((str.charCodeAt(offset) | TO_LOWER_BIT) === CharCodes.LOWER_X) {
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            this.state = EntityDecoderState.NumericHex;
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            this.consumed += 1;
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            return this.stateNumericHex(str, offset + 1);
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        }
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        this.state = EntityDecoderState.NumericDecimal;
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        return this.stateNumericDecimal(str, offset);
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    };
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    EntityDecoder.prototype.addToNumericResult = function (str, start, end, base) {
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        if (start !== end) {
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            var digitCount = end - start;
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            this.result =
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                this.result * Math.pow(base, digitCount) +
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                    parseInt(str.substr(start, digitCount), base);
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            this.consumed += digitCount;
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        }
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    };
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    /**
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     * Parses a hexadecimal numeric entity.
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     *
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     * Equivalent to the `Hexademical character reference state` in the HTML spec.
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     *
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     * @param str The string containing the entity (or a continuation of the entity).
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     * @param offset The current offset.
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     * @returns The number of characters that were consumed, or -1 if the entity is incomplete.
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     */
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    EntityDecoder.prototype.stateNumericHex = function (str, offset) {
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        var startIdx = offset;
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        while (offset < str.length) {
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            var char = str.charCodeAt(offset);
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            if (isNumber(char) || isHexadecimalCharacter(char)) {
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                offset += 1;
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            }
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            else {
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                this.addToNumericResult(str, startIdx, offset, 16);
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                return this.emitNumericEntity(char, 3);
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            }
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        }
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        this.addToNumericResult(str, startIdx, offset, 16);
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        return -1;
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    };
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    /**
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     * Parses a decimal numeric entity.
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     *
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     * Equivalent to the `Decimal character reference state` in the HTML spec.
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     *
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     * @param str The string containing the entity (or a continuation of the entity).
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     * @param offset The current offset.
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     * @returns The number of characters that were consumed, or -1 if the entity is incomplete.
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     */
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    EntityDecoder.prototype.stateNumericDecimal = function (str, offset) {
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        var startIdx = offset;
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        while (offset < str.length) {
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            var char = str.charCodeAt(offset);
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            if (isNumber(char)) {
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                offset += 1;
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            }
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            else {
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                this.addToNumericResult(str, startIdx, offset, 10);
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                return this.emitNumericEntity(char, 2);
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            }
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        }
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        this.addToNumericResult(str, startIdx, offset, 10);
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        return -1;
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    };
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    /**
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     * Validate and emit a numeric entity.
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     *
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     * Implements the logic from the `Hexademical character reference start
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     * state` and `Numeric character reference end state` in the HTML spec.
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     *
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     * @param lastCp The last code point of the entity. Used to see if the
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     *               entity was terminated with a semicolon.
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     * @param expectedLength The minimum number of characters that should be
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     *                       consumed. Used to validate that at least one digit
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     *                       was consumed.
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     * @returns The number of characters that were consumed.
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     */
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    EntityDecoder.prototype.emitNumericEntity = function (lastCp, expectedLength) {
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        var _a;
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        // Ensure we consumed at least one digit.
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        if (this.consumed <= expectedLength) {
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            (_a = this.errors) === null || _a === void 0 ? void 0 : _a.absenceOfDigitsInNumericCharacterReference(this.consumed);
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            return 0;
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        }
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        // Figure out if this is a legit end of the entity
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        if (lastCp === CharCodes.SEMI) {
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            this.consumed += 1;
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        }
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        else if (this.decodeMode === DecodingMode.Strict) {
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            return 0;
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        }
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        this.emitCodePoint((0, decode_codepoint_js_1.replaceCodePoint)(this.result), this.consumed);
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        if (this.errors) {
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            if (lastCp !== CharCodes.SEMI) {
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                this.errors.missingSemicolonAfterCharacterReference();
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            }
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            this.errors.validateNumericCharacterReference(this.result);
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        }
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        return this.consumed;
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    };
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    /**
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     * Parses a named entity.
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     *
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     * Equivalent to the `Named character reference state` in the HTML spec.
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     *
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     * @param str The string containing the entity (or a continuation of the entity).
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     * @param offset The current offset.
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     * @returns The number of characters that were consumed, or -1 if the entity is incomplete.
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     */
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    EntityDecoder.prototype.stateNamedEntity = function (str, offset) {
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        var decodeTree = this.decodeTree;
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        var current = decodeTree[this.treeIndex];
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        // The mask is the number of bytes of the value, including the current byte.
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        var valueLength = (current & BinTrieFlags.VALUE_LENGTH) >> 14;
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        for (; offset < str.length; offset++, this.excess++) {
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            var char = str.charCodeAt(offset);
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            this.treeIndex = determineBranch(decodeTree, current, this.treeIndex + Math.max(1, valueLength), char);
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            if (this.treeIndex < 0) {
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                return this.result === 0 ||
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                    // If we are parsing an attribute
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                    (this.decodeMode === DecodingMode.Attribute &&
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                        // We shouldn't have consumed any characters after the entity,
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                        (valueLength === 0 ||
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                            // And there should be no invalid characters.
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                            isEntityInAttributeInvalidEnd(char)))
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                    ? 0
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                    : this.emitNotTerminatedNamedEntity();
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            }
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            current = decodeTree[this.treeIndex];
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            valueLength = (current & BinTrieFlags.VALUE_LENGTH) >> 14;
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            // If the branch is a value, store it and continue
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            if (valueLength !== 0) {
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                // If the entity is terminated by a semicolon, we are done.
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                if (char === CharCodes.SEMI) {
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                    return this.emitNamedEntityData(this.treeIndex, valueLength, this.consumed + this.excess);
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                }
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                // If we encounter a non-terminated (legacy) entity while parsing strictly, then ignore it.
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                if (this.decodeMode !== DecodingMode.Strict) {
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                    this.result = this.treeIndex;
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                    this.consumed += this.excess;
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                    this.excess = 0;
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                }
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            }
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        }
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        return -1;
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    };
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    /**
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     * Emit a named entity that was not terminated with a semicolon.
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     *
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     * @returns The number of characters consumed.
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     */
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    EntityDecoder.prototype.emitNotTerminatedNamedEntity = function () {
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        var _a;
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        var _b = this, result = _b.result, decodeTree = _b.decodeTree;
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        var valueLength = (decodeTree[result] & BinTrieFlags.VALUE_LENGTH) >> 14;
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        this.emitNamedEntityData(result, valueLength, this.consumed);
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        (_a = this.errors) === null || _a === void 0 ? void 0 : _a.missingSemicolonAfterCharacterReference();
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        return this.consumed;
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    };
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    /**
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     * Emit a named entity.
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     *
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     * @param result The index of the entity in the decode tree.
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     * @param valueLength The number of bytes in the entity.
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     * @param consumed The number of characters consumed.
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     *
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     * @returns The number of characters consumed.
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     */
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    EntityDecoder.prototype.emitNamedEntityData = function (result, valueLength, consumed) {
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        var decodeTree = this.decodeTree;
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        this.emitCodePoint(valueLength === 1
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            ? decodeTree[result] & ~BinTrieFlags.VALUE_LENGTH
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            : decodeTree[result + 1], consumed);
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        if (valueLength === 3) {
 | 
						|
            // For multi-byte values, we need to emit the second byte.
 | 
						|
            this.emitCodePoint(decodeTree[result + 2], consumed);
 | 
						|
        }
 | 
						|
        return consumed;
 | 
						|
    };
 | 
						|
    /**
 | 
						|
     * Signal to the parser that the end of the input was reached.
 | 
						|
     *
 | 
						|
     * Remaining data will be emitted and relevant errors will be produced.
 | 
						|
     *
 | 
						|
     * @returns The number of characters consumed.
 | 
						|
     */
 | 
						|
    EntityDecoder.prototype.end = function () {
 | 
						|
        var _a;
 | 
						|
        switch (this.state) {
 | 
						|
            case EntityDecoderState.NamedEntity: {
 | 
						|
                // Emit a named entity if we have one.
 | 
						|
                return this.result !== 0 &&
 | 
						|
                    (this.decodeMode !== DecodingMode.Attribute ||
 | 
						|
                        this.result === this.treeIndex)
 | 
						|
                    ? this.emitNotTerminatedNamedEntity()
 | 
						|
                    : 0;
 | 
						|
            }
 | 
						|
            // Otherwise, emit a numeric entity if we have one.
 | 
						|
            case EntityDecoderState.NumericDecimal: {
 | 
						|
                return this.emitNumericEntity(0, 2);
 | 
						|
            }
 | 
						|
            case EntityDecoderState.NumericHex: {
 | 
						|
                return this.emitNumericEntity(0, 3);
 | 
						|
            }
 | 
						|
            case EntityDecoderState.NumericStart: {
 | 
						|
                (_a = this.errors) === null || _a === void 0 ? void 0 : _a.absenceOfDigitsInNumericCharacterReference(this.consumed);
 | 
						|
                return 0;
 | 
						|
            }
 | 
						|
            case EntityDecoderState.EntityStart: {
 | 
						|
                // Return 0 if we have no entity.
 | 
						|
                return 0;
 | 
						|
            }
 | 
						|
        }
 | 
						|
    };
 | 
						|
    return EntityDecoder;
 | 
						|
}());
 | 
						|
exports.EntityDecoder = EntityDecoder;
 | 
						|
/**
 | 
						|
 * Creates a function that decodes entities in a string.
 | 
						|
 *
 | 
						|
 * @param decodeTree The decode tree.
 | 
						|
 * @returns A function that decodes entities in a string.
 | 
						|
 */
 | 
						|
function getDecoder(decodeTree) {
 | 
						|
    var ret = "";
 | 
						|
    var decoder = new EntityDecoder(decodeTree, function (str) { return (ret += (0, decode_codepoint_js_1.fromCodePoint)(str)); });
 | 
						|
    return function decodeWithTrie(str, decodeMode) {
 | 
						|
        var lastIndex = 0;
 | 
						|
        var offset = 0;
 | 
						|
        while ((offset = str.indexOf("&", offset)) >= 0) {
 | 
						|
            ret += str.slice(lastIndex, offset);
 | 
						|
            decoder.startEntity(decodeMode);
 | 
						|
            var len = decoder.write(str, 
 | 
						|
            // Skip the "&"
 | 
						|
            offset + 1);
 | 
						|
            if (len < 0) {
 | 
						|
                lastIndex = offset + decoder.end();
 | 
						|
                break;
 | 
						|
            }
 | 
						|
            lastIndex = offset + len;
 | 
						|
            // If `len` is 0, skip the current `&` and continue.
 | 
						|
            offset = len === 0 ? lastIndex + 1 : lastIndex;
 | 
						|
        }
 | 
						|
        var result = ret + str.slice(lastIndex);
 | 
						|
        // Make sure we don't keep a reference to the final string.
 | 
						|
        ret = "";
 | 
						|
        return result;
 | 
						|
    };
 | 
						|
}
 | 
						|
/**
 | 
						|
 * Determines the branch of the current node that is taken given the current
 | 
						|
 * character. This function is used to traverse the trie.
 | 
						|
 *
 | 
						|
 * @param decodeTree The trie.
 | 
						|
 * @param current The current node.
 | 
						|
 * @param nodeIdx The index right after the current node and its value.
 | 
						|
 * @param char The current character.
 | 
						|
 * @returns The index of the next node, or -1 if no branch is taken.
 | 
						|
 */
 | 
						|
function determineBranch(decodeTree, current, nodeIdx, char) {
 | 
						|
    var branchCount = (current & BinTrieFlags.BRANCH_LENGTH) >> 7;
 | 
						|
    var jumpOffset = current & BinTrieFlags.JUMP_TABLE;
 | 
						|
    // Case 1: Single branch encoded in jump offset
 | 
						|
    if (branchCount === 0) {
 | 
						|
        return jumpOffset !== 0 && char === jumpOffset ? nodeIdx : -1;
 | 
						|
    }
 | 
						|
    // Case 2: Multiple branches encoded in jump table
 | 
						|
    if (jumpOffset) {
 | 
						|
        var value = char - jumpOffset;
 | 
						|
        return value < 0 || value >= branchCount
 | 
						|
            ? -1
 | 
						|
            : decodeTree[nodeIdx + value] - 1;
 | 
						|
    }
 | 
						|
    // Case 3: Multiple branches encoded in dictionary
 | 
						|
    // Binary search for the character.
 | 
						|
    var lo = nodeIdx;
 | 
						|
    var hi = lo + branchCount - 1;
 | 
						|
    while (lo <= hi) {
 | 
						|
        var mid = (lo + hi) >>> 1;
 | 
						|
        var midVal = decodeTree[mid];
 | 
						|
        if (midVal < char) {
 | 
						|
            lo = mid + 1;
 | 
						|
        }
 | 
						|
        else if (midVal > char) {
 | 
						|
            hi = mid - 1;
 | 
						|
        }
 | 
						|
        else {
 | 
						|
            return decodeTree[mid + branchCount];
 | 
						|
        }
 | 
						|
    }
 | 
						|
    return -1;
 | 
						|
}
 | 
						|
exports.determineBranch = determineBranch;
 | 
						|
var htmlDecoder = getDecoder(decode_data_html_js_1.default);
 | 
						|
var xmlDecoder = getDecoder(decode_data_xml_js_1.default);
 | 
						|
/**
 | 
						|
 * Decodes an HTML string.
 | 
						|
 *
 | 
						|
 * @param str The string to decode.
 | 
						|
 * @param mode The decoding mode.
 | 
						|
 * @returns The decoded string.
 | 
						|
 */
 | 
						|
function decodeHTML(str, mode) {
 | 
						|
    if (mode === void 0) { mode = DecodingMode.Legacy; }
 | 
						|
    return htmlDecoder(str, mode);
 | 
						|
}
 | 
						|
exports.decodeHTML = decodeHTML;
 | 
						|
/**
 | 
						|
 * Decodes an HTML string in an attribute.
 | 
						|
 *
 | 
						|
 * @param str The string to decode.
 | 
						|
 * @returns The decoded string.
 | 
						|
 */
 | 
						|
function decodeHTMLAttribute(str) {
 | 
						|
    return htmlDecoder(str, DecodingMode.Attribute);
 | 
						|
}
 | 
						|
exports.decodeHTMLAttribute = decodeHTMLAttribute;
 | 
						|
/**
 | 
						|
 * Decodes an HTML string, requiring all entities to be terminated by a semicolon.
 | 
						|
 *
 | 
						|
 * @param str The string to decode.
 | 
						|
 * @returns The decoded string.
 | 
						|
 */
 | 
						|
function decodeHTMLStrict(str) {
 | 
						|
    return htmlDecoder(str, DecodingMode.Strict);
 | 
						|
}
 | 
						|
exports.decodeHTMLStrict = decodeHTMLStrict;
 | 
						|
/**
 | 
						|
 * Decodes an XML string, requiring all entities to be terminated by a semicolon.
 | 
						|
 *
 | 
						|
 * @param str The string to decode.
 | 
						|
 * @returns The decoded string.
 | 
						|
 */
 | 
						|
function decodeXML(str) {
 | 
						|
    return xmlDecoder(str, DecodingMode.Strict);
 | 
						|
}
 | 
						|
exports.decodeXML = decodeXML;
 | 
						|
//# sourceMappingURL=decode.js.map
 |