666 lines
18 KiB
JavaScript
666 lines
18 KiB
JavaScript
'use strict';
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// This is free and unencumbered software released into the public domain.
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// See LICENSE.md for more information.
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//
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// Utilities
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//
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/**
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* @param {number} a The number to test.
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* @param {number} min The minimum value in the range, inclusive.
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* @param {number} max The maximum value in the range, inclusive.
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* @return {boolean} True if a >= min and a <= max.
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*/
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function inRange(a, min, max) {
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return min <= a && a <= max;
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}
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/**
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* @param {*} o
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* @return {Object}
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*/
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function ToDictionary(o) {
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if (o === undefined) return {};
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if (o === Object(o)) return o;
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throw TypeError('Could not convert argument to dictionary');
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}
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/**
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* @param {string} string Input string of UTF-16 code units.
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* @return {!Array.<number>} Code points.
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*/
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function stringToCodePoints(string) {
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// https://heycam.github.io/webidl/#dfn-obtain-unicode
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// 1. Let S be the DOMString value.
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var s = String(string);
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// 2. Let n be the length of S.
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var n = s.length;
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// 3. Initialize i to 0.
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var i = 0;
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// 4. Initialize U to be an empty sequence of Unicode characters.
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var u = [];
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// 5. While i < n:
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while (i < n) {
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// 1. Let c be the code unit in S at index i.
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var c = s.charCodeAt(i);
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// 2. Depending on the value of c:
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// c < 0xD800 or c > 0xDFFF
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if (c < 0xD800 || c > 0xDFFF) {
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// Append to U the Unicode character with code point c.
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u.push(c);
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}
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// 0xDC00 ≤ c ≤ 0xDFFF
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else if (0xDC00 <= c && c <= 0xDFFF) {
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// Append to U a U+FFFD REPLACEMENT CHARACTER.
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u.push(0xFFFD);
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}
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// 0xD800 ≤ c ≤ 0xDBFF
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else if (0xD800 <= c && c <= 0xDBFF) {
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// 1. If i = n−1, then append to U a U+FFFD REPLACEMENT
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// CHARACTER.
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if (i === n - 1) {
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u.push(0xFFFD);
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}
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// 2. Otherwise, i < n−1:
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else {
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// 1. Let d be the code unit in S at index i+1.
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var d = string.charCodeAt(i + 1);
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// 2. If 0xDC00 ≤ d ≤ 0xDFFF, then:
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if (0xDC00 <= d && d <= 0xDFFF) {
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// 1. Let a be c & 0x3FF.
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var a = c & 0x3FF;
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// 2. Let b be d & 0x3FF.
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var b = d & 0x3FF;
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// 3. Append to U the Unicode character with code point
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// 2^16+2^10*a+b.
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u.push(0x10000 + (a << 10) + b);
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// 4. Set i to i+1.
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i += 1;
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}
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// 3. Otherwise, d < 0xDC00 or d > 0xDFFF. Append to U a
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// U+FFFD REPLACEMENT CHARACTER.
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else {
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u.push(0xFFFD);
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}
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}
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}
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// 3. Set i to i+1.
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i += 1;
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}
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// 6. Return U.
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return u;
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}
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/**
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* @param {!Array.<number>} code_points Array of code points.
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* @return {string} string String of UTF-16 code units.
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*/
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function codePointsToString(code_points) {
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var s = '';
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for (var i = 0; i < code_points.length; ++i) {
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var cp = code_points[i];
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if (cp <= 0xFFFF) {
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s += String.fromCharCode(cp);
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} else {
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cp -= 0x10000;
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s += String.fromCharCode((cp >> 10) + 0xD800,
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(cp & 0x3FF) + 0xDC00);
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}
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}
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return s;
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}
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//
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// Implementation of Encoding specification
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// https://encoding.spec.whatwg.org/
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//
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//
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// 3. Terminology
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//
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/**
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* End-of-stream is a special token that signifies no more tokens
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* are in the stream.
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* @const
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*/ var end_of_stream = -1;
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/**
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* A stream represents an ordered sequence of tokens.
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*
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* @constructor
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* @param {!(Array.<number>|Uint8Array)} tokens Array of tokens that provide the
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* stream.
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*/
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function Stream(tokens) {
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/** @type {!Array.<number>} */
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this.tokens = [].slice.call(tokens);
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}
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Stream.prototype = {
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/**
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* @return {boolean} True if end-of-stream has been hit.
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*/
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endOfStream: function() {
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return !this.tokens.length;
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},
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/**
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* When a token is read from a stream, the first token in the
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* stream must be returned and subsequently removed, and
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* end-of-stream must be returned otherwise.
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*
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* @return {number} Get the next token from the stream, or
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* end_of_stream.
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*/
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read: function() {
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if (!this.tokens.length)
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return end_of_stream;
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return this.tokens.shift();
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},
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/**
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* When one or more tokens are prepended to a stream, those tokens
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* must be inserted, in given order, before the first token in the
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* stream.
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*
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* @param {(number|!Array.<number>)} token The token(s) to prepend to the stream.
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*/
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prepend: function(token) {
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if (Array.isArray(token)) {
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var tokens = /**@type {!Array.<number>}*/(token);
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while (tokens.length)
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this.tokens.unshift(tokens.pop());
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} else {
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this.tokens.unshift(token);
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}
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},
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/**
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* When one or more tokens are pushed to a stream, those tokens
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* must be inserted, in given order, after the last token in the
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* stream.
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*
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* @param {(number|!Array.<number>)} token The tokens(s) to prepend to the stream.
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*/
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push: function(token) {
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if (Array.isArray(token)) {
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var tokens = /**@type {!Array.<number>}*/(token);
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while (tokens.length)
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this.tokens.push(tokens.shift());
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} else {
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this.tokens.push(token);
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}
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}
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};
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//
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// 4. Encodings
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//
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// 4.1 Encoders and decoders
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/** @const */
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var finished = -1;
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/**
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* @param {boolean} fatal If true, decoding errors raise an exception.
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* @param {number=} opt_code_point Override the standard fallback code point.
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* @return {number} The code point to insert on a decoding error.
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*/
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function decoderError(fatal, opt_code_point) {
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if (fatal)
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throw TypeError('Decoder error');
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return opt_code_point || 0xFFFD;
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}
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/** @interface */
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function Decoder() {}
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Decoder.prototype = {
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/**
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* @param {Stream} stream The stream of bytes being decoded.
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* @param {number} bite The next byte read from the stream.
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* @return {?(number|!Array.<number>)} The next code point(s)
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* decoded, or null if not enough data exists in the input
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* stream to decode a complete code point, or |finished|.
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*/
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handler: function(stream, bite) {}
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};
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/** @interface */
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function Encoder() {}
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Encoder.prototype = {
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/**
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* @param {Stream} stream The stream of code points being encoded.
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* @param {number} code_point Next code point read from the stream.
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* @return {(number|!Array.<number>)} Byte(s) to emit, or |finished|.
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*/
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handler: function(stream, code_point) {}
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};
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//
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// 7. API
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//
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/** @const */ var DEFAULT_ENCODING = 'utf-8';
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// 7.1 Interface TextDecoder
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/**
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* @constructor
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* @param {string=} encoding The label of the encoding;
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* defaults to 'utf-8'.
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* @param {Object=} options
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*/
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function TextDecoder(encoding, options) {
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if (!(this instanceof TextDecoder)) {
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return new TextDecoder(encoding, options);
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}
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encoding = encoding !== undefined ? String(encoding).toLowerCase() : DEFAULT_ENCODING;
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if (encoding !== DEFAULT_ENCODING) {
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throw new Error('Encoding not supported. Only utf-8 is supported');
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}
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options = ToDictionary(options);
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/** @private @type {boolean} */
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this._streaming = false;
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/** @private @type {boolean} */
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this._BOMseen = false;
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/** @private @type {?Decoder} */
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this._decoder = null;
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/** @private @type {boolean} */
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this._fatal = Boolean(options['fatal']);
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/** @private @type {boolean} */
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this._ignoreBOM = Boolean(options['ignoreBOM']);
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Object.defineProperty(this, 'encoding', {value: 'utf-8'});
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Object.defineProperty(this, 'fatal', {value: this._fatal});
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Object.defineProperty(this, 'ignoreBOM', {value: this._ignoreBOM});
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}
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TextDecoder.prototype = {
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/**
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* @param {ArrayBufferView=} input The buffer of bytes to decode.
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* @param {Object=} options
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* @return {string} The decoded string.
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*/
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decode: function decode(input, options) {
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var bytes;
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if (typeof input === 'object' && input instanceof ArrayBuffer) {
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bytes = new Uint8Array(input);
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} else if (typeof input === 'object' && 'buffer' in input &&
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input.buffer instanceof ArrayBuffer) {
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bytes = new Uint8Array(input.buffer,
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input.byteOffset,
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input.byteLength);
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} else {
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bytes = new Uint8Array(0);
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}
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options = ToDictionary(options);
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if (!this._streaming) {
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this._decoder = new UTF8Decoder({fatal: this._fatal});
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this._BOMseen = false;
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}
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this._streaming = Boolean(options['stream']);
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var input_stream = new Stream(bytes);
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var code_points = [];
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/** @type {?(number|!Array.<number>)} */
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var result;
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while (!input_stream.endOfStream()) {
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result = this._decoder.handler(input_stream, input_stream.read());
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if (result === finished)
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break;
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if (result === null)
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continue;
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if (Array.isArray(result))
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code_points.push.apply(code_points, /**@type {!Array.<number>}*/(result));
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else
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code_points.push(result);
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}
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if (!this._streaming) {
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do {
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result = this._decoder.handler(input_stream, input_stream.read());
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if (result === finished)
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break;
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if (result === null)
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continue;
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if (Array.isArray(result))
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code_points.push.apply(code_points, /**@type {!Array.<number>}*/(result));
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else
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code_points.push(result);
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} while (!input_stream.endOfStream());
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this._decoder = null;
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}
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if (code_points.length) {
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// If encoding is one of utf-8, utf-16be, and utf-16le, and
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// ignore BOM flag and BOM seen flag are unset, run these
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// subsubsteps:
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if (['utf-8'].indexOf(this.encoding) !== -1 &&
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!this._ignoreBOM && !this._BOMseen) {
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// If token is U+FEFF, set BOM seen flag.
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if (code_points[0] === 0xFEFF) {
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this._BOMseen = true;
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code_points.shift();
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} else {
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// Otherwise, if token is not end-of-stream, set BOM seen
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// flag and append token to output.
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this._BOMseen = true;
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}
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}
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}
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return codePointsToString(code_points);
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}
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};
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// 7.2 Interface TextEncoder
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/**
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* @constructor
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* @param {string=} encoding The label of the encoding;
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* defaults to 'utf-8'.
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* @param {Object=} options
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*/
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function TextEncoder(encoding, options) {
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if (!(this instanceof TextEncoder))
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return new TextEncoder(encoding, options);
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encoding = encoding !== undefined ? String(encoding).toLowerCase() : DEFAULT_ENCODING;
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if (encoding !== DEFAULT_ENCODING) {
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throw new Error('Encoding not supported. Only utf-8 is supported');
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}
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options = ToDictionary(options);
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/** @private @type {boolean} */
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this._streaming = false;
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/** @private @type {?Encoder} */
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this._encoder = null;
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/** @private @type {{fatal: boolean}} */
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this._options = {fatal: Boolean(options['fatal'])};
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Object.defineProperty(this, 'encoding', {value: 'utf-8'});
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}
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TextEncoder.prototype = {
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/**
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* @param {string=} opt_string The string to encode.
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* @param {Object=} options
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* @return {Uint8Array} Encoded bytes, as a Uint8Array.
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*/
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encode: function encode(opt_string, options) {
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opt_string = opt_string ? String(opt_string) : '';
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options = ToDictionary(options);
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// NOTE: This option is nonstandard. None of the encodings
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// permitted for encoding (i.e. UTF-8, UTF-16) are stateful,
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// so streaming is not necessary.
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if (!this._streaming)
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this._encoder = new UTF8Encoder(this._options);
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this._streaming = Boolean(options['stream']);
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var bytes = [];
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var input_stream = new Stream(stringToCodePoints(opt_string));
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/** @type {?(number|!Array.<number>)} */
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var result;
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while (!input_stream.endOfStream()) {
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result = this._encoder.handler(input_stream, input_stream.read());
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if (result === finished)
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break;
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if (Array.isArray(result))
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bytes.push.apply(bytes, /**@type {!Array.<number>}*/(result));
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else
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bytes.push(result);
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}
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if (!this._streaming) {
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while (true) {
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result = this._encoder.handler(input_stream, input_stream.read());
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if (result === finished)
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break;
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if (Array.isArray(result))
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bytes.push.apply(bytes, /**@type {!Array.<number>}*/(result));
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else
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bytes.push(result);
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}
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this._encoder = null;
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}
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return new Uint8Array(bytes);
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}
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};
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//
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// 8. The encoding
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//
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// 8.1 utf-8
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/**
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* @constructor
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* @implements {Decoder}
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* @param {{fatal: boolean}} options
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*/
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function UTF8Decoder(options) {
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var fatal = options.fatal;
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// utf-8's decoder's has an associated utf-8 code point, utf-8
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// bytes seen, and utf-8 bytes needed (all initially 0), a utf-8
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// lower boundary (initially 0x80), and a utf-8 upper boundary
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// (initially 0xBF).
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var /** @type {number} */ utf8_code_point = 0,
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/** @type {number} */ utf8_bytes_seen = 0,
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/** @type {number} */ utf8_bytes_needed = 0,
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/** @type {number} */ utf8_lower_boundary = 0x80,
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/** @type {number} */ utf8_upper_boundary = 0xBF;
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/**
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* @param {Stream} stream The stream of bytes being decoded.
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* @param {number} bite The next byte read from the stream.
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* @return {?(number|!Array.<number>)} The next code point(s)
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* decoded, or null if not enough data exists in the input
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* stream to decode a complete code point.
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*/
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this.handler = function(stream, bite) {
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// 1. If byte is end-of-stream and utf-8 bytes needed is not 0,
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// set utf-8 bytes needed to 0 and return error.
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if (bite === end_of_stream && utf8_bytes_needed !== 0) {
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utf8_bytes_needed = 0;
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return decoderError(fatal);
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}
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// 2. If byte is end-of-stream, return finished.
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if (bite === end_of_stream)
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return finished;
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// 3. If utf-8 bytes needed is 0, based on byte:
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if (utf8_bytes_needed === 0) {
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// 0x00 to 0x7F
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if (inRange(bite, 0x00, 0x7F)) {
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// Return a code point whose value is byte.
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return bite;
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}
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// 0xC2 to 0xDF
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if (inRange(bite, 0xC2, 0xDF)) {
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// Set utf-8 bytes needed to 1 and utf-8 code point to byte
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// − 0xC0.
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utf8_bytes_needed = 1;
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utf8_code_point = bite - 0xC0;
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}
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// 0xE0 to 0xEF
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else if (inRange(bite, 0xE0, 0xEF)) {
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// 1. If byte is 0xE0, set utf-8 lower boundary to 0xA0.
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if (bite === 0xE0)
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utf8_lower_boundary = 0xA0;
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// 2. If byte is 0xED, set utf-8 upper boundary to 0x9F.
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if (bite === 0xED)
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utf8_upper_boundary = 0x9F;
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// 3. Set utf-8 bytes needed to 2 and utf-8 code point to
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// byte − 0xE0.
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utf8_bytes_needed = 2;
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utf8_code_point = bite - 0xE0;
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}
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// 0xF0 to 0xF4
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else if (inRange(bite, 0xF0, 0xF4)) {
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// 1. If byte is 0xF0, set utf-8 lower boundary to 0x90.
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if (bite === 0xF0)
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utf8_lower_boundary = 0x90;
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// 2. If byte is 0xF4, set utf-8 upper boundary to 0x8F.
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if (bite === 0xF4)
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utf8_upper_boundary = 0x8F;
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||
// 3. Set utf-8 bytes needed to 3 and utf-8 code point to
|
||
// byte − 0xF0.
|
||
utf8_bytes_needed = 3;
|
||
utf8_code_point = bite - 0xF0;
|
||
}
|
||
|
||
// Otherwise
|
||
else {
|
||
// Return error.
|
||
return decoderError(fatal);
|
||
}
|
||
|
||
// Then (byte is in the range 0xC2 to 0xF4) set utf-8 code
|
||
// point to utf-8 code point << (6 × utf-8 bytes needed) and
|
||
// return continue.
|
||
utf8_code_point = utf8_code_point << (6 * utf8_bytes_needed);
|
||
return null;
|
||
}
|
||
|
||
// 4. If byte is not in the range utf-8 lower boundary to utf-8
|
||
// upper boundary, run these substeps:
|
||
if (!inRange(bite, utf8_lower_boundary, utf8_upper_boundary)) {
|
||
|
||
// 1. Set utf-8 code point, utf-8 bytes needed, and utf-8
|
||
// bytes seen to 0, set utf-8 lower boundary to 0x80, and set
|
||
// utf-8 upper boundary to 0xBF.
|
||
utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;
|
||
utf8_lower_boundary = 0x80;
|
||
utf8_upper_boundary = 0xBF;
|
||
|
||
// 2. Prepend byte to stream.
|
||
stream.prepend(bite);
|
||
|
||
// 3. Return error.
|
||
return decoderError(fatal);
|
||
}
|
||
|
||
// 5. Set utf-8 lower boundary to 0x80 and utf-8 upper boundary
|
||
// to 0xBF.
|
||
utf8_lower_boundary = 0x80;
|
||
utf8_upper_boundary = 0xBF;
|
||
|
||
// 6. Increase utf-8 bytes seen by one and set utf-8 code point
|
||
// to utf-8 code point + (byte − 0x80) << (6 × (utf-8 bytes
|
||
// needed − utf-8 bytes seen)).
|
||
utf8_bytes_seen += 1;
|
||
utf8_code_point += (bite - 0x80) << (6 * (utf8_bytes_needed - utf8_bytes_seen));
|
||
|
||
// 7. If utf-8 bytes seen is not equal to utf-8 bytes needed,
|
||
// continue.
|
||
if (utf8_bytes_seen !== utf8_bytes_needed)
|
||
return null;
|
||
|
||
// 8. Let code point be utf-8 code point.
|
||
var code_point = utf8_code_point;
|
||
|
||
// 9. Set utf-8 code point, utf-8 bytes needed, and utf-8 bytes
|
||
// seen to 0.
|
||
utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;
|
||
|
||
// 10. Return a code point whose value is code point.
|
||
return code_point;
|
||
};
|
||
}
|
||
|
||
/**
|
||
* @constructor
|
||
* @implements {Encoder}
|
||
* @param {{fatal: boolean}} options
|
||
*/
|
||
function UTF8Encoder(options) {
|
||
var fatal = options.fatal;
|
||
/**
|
||
* @param {Stream} stream Input stream.
|
||
* @param {number} code_point Next code point read from the stream.
|
||
* @return {(number|!Array.<number>)} Byte(s) to emit.
|
||
*/
|
||
this.handler = function(stream, code_point) {
|
||
// 1. If code point is end-of-stream, return finished.
|
||
if (code_point === end_of_stream)
|
||
return finished;
|
||
|
||
// 2. If code point is in the range U+0000 to U+007F, return a
|
||
// byte whose value is code point.
|
||
if (inRange(code_point, 0x0000, 0x007f))
|
||
return code_point;
|
||
|
||
// 3. Set count and offset based on the range code point is in:
|
||
var count, offset;
|
||
// U+0080 to U+07FF: 1 and 0xC0
|
||
if (inRange(code_point, 0x0080, 0x07FF)) {
|
||
count = 1;
|
||
offset = 0xC0;
|
||
}
|
||
// U+0800 to U+FFFF: 2 and 0xE0
|
||
else if (inRange(code_point, 0x0800, 0xFFFF)) {
|
||
count = 2;
|
||
offset = 0xE0;
|
||
}
|
||
// U+10000 to U+10FFFF: 3 and 0xF0
|
||
else if (inRange(code_point, 0x10000, 0x10FFFF)) {
|
||
count = 3;
|
||
offset = 0xF0;
|
||
}
|
||
|
||
// 4.Let bytes be a byte sequence whose first byte is (code
|
||
// point >> (6 × count)) + offset.
|
||
var bytes = [(code_point >> (6 * count)) + offset];
|
||
|
||
// 5. Run these substeps while count is greater than 0:
|
||
while (count > 0) {
|
||
|
||
// 1. Set temp to code point >> (6 × (count − 1)).
|
||
var temp = code_point >> (6 * (count - 1));
|
||
|
||
// 2. Append to bytes 0x80 | (temp & 0x3F).
|
||
bytes.push(0x80 | (temp & 0x3F));
|
||
|
||
// 3. Decrease count by one.
|
||
count -= 1;
|
||
}
|
||
|
||
// 6. Return bytes bytes, in order.
|
||
return bytes;
|
||
};
|
||
}
|
||
|
||
export {TextEncoder, TextDecoder};
|