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7
node_modules/html-encoding-sniffer/LICENSE.txt
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node_modules/html-encoding-sniffer/LICENSE.txt
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Copyright © 2016 Domenic Denicola <d@domenic.me>
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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38
node_modules/html-encoding-sniffer/README.md
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node_modules/html-encoding-sniffer/README.md
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# Determine the Encoding of a HTML Byte Stream
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This package implements the HTML Standard's [encoding sniffing algorithm](https://html.spec.whatwg.org/multipage/syntax.html#encoding-sniffing-algorithm) in all its glory. The most interesting part of this is how it pre-scans the first 1024 bytes in order to search for certain `<meta charset>`-related patterns.
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```js
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const htmlEncodingSniffer = require("html-encoding-sniffer");
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const fs = require("fs");
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const htmlBuffer = fs.readFileSync("./html-page.html");
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const sniffedEncoding = htmlEncodingSniffer(htmlBuffer);
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```
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The returned value will be a canonical [encoding name](https://encoding.spec.whatwg.org/#names-and-labels) (not a label). You might then combine this with the [whatwg-encoding](https://github.com/jsdom/whatwg-encoding) package to decode the result:
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```js
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const whatwgEncoding = require("whatwg-encoding");
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const htmlString = whatwgEncoding.decode(htmlBuffer, sniffedEncoding);
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```
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## Options
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You can pass two potential options to `htmlEncodingSniffer`:
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```js
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const sniffedEncoding = htmlEncodingSniffer(htmlBuffer, {
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transportLayerEncodingLabel,
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defaultEncoding
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});
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```
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These represent two possible inputs into the [encoding sniffing algorithm](https://html.spec.whatwg.org/multipage/syntax.html#encoding-sniffing-algorithm):
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- `transportLayerEncodingLabel` is an encoding label that is obtained from the "transport layer" (probably a HTTP `Content-Type` header), which overrides everything but a BOM.
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- `defaultEncoding` is the ultimate fallback encoding used if no valid encoding is supplied by the transport layer, and no encoding is sniffed from the bytes. It defaults to `"windows-1252"`, as recommended by the algorithm's table of suggested defaults for "All other locales" (including the `en` locale).
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## Credits
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This package was originally based on the excellent work of [@nicolashenry](https://github.com/nicolashenry), [in jsdom](https://github.com/tmpvar/jsdom/blob/16fd85618f2705d181232f6552125872a37164bc/lib/jsdom/living/helpers/encoding.js). It has since been pulled out into this separate package.
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302
node_modules/html-encoding-sniffer/lib/html-encoding-sniffer.js
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node_modules/html-encoding-sniffer/lib/html-encoding-sniffer.js
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"use strict";
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const whatwgEncoding = require("whatwg-encoding");
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// https://html.spec.whatwg.org/#encoding-sniffing-algorithm
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module.exports = function sniffHTMLEncoding(buffer, options) {
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let encoding = whatwgEncoding.getBOMEncoding(buffer); // see https://github.com/whatwg/html/issues/1910
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if (options === undefined) {
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options = {};
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}
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if (encoding === null && options.transportLayerEncodingLabel !== undefined) {
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encoding = whatwgEncoding.labelToName(options.transportLayerEncodingLabel);
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}
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if (encoding === null) {
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encoding = prescanMetaCharset(buffer);
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}
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if (encoding === null && options.defaultEncoding !== undefined) {
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encoding = options.defaultEncoding;
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}
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if (encoding === null) {
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encoding = "windows-1252";
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}
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return encoding;
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};
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// https://html.spec.whatwg.org/multipage/syntax.html#prescan-a-byte-stream-to-determine-its-encoding
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function prescanMetaCharset(buffer) {
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const l = Math.min(buffer.length, 1024);
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for (let i = 0; i < l; i++) {
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let c = buffer[i];
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if (c === 0x3C) {
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// "<"
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let c1 = buffer[i + 1];
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let c2 = buffer[i + 2];
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const c3 = buffer[i + 3];
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const c4 = buffer[i + 4];
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const c5 = buffer[i + 5];
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// !-- (comment start)
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if (c1 === 0x21 && c2 === 0x2D && c3 === 0x2D) {
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i += 4;
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for (; i < l; i++) {
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c = buffer[i];
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c1 = buffer[i + 1];
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c2 = buffer[i + 2];
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// --> (comment end)
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if (c === 0x2D && c1 === 0x2D && c2 === 0x3E) {
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i += 2;
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break;
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}
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}
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} else if ((c1 === 0x4D || c1 === 0x6D) &&
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(c2 === 0x45 || c2 === 0x65) &&
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(c3 === 0x54 || c3 === 0x74) &&
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(c4 === 0x41 || c4 === 0x61) &&
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(isSpaceCharacter(c5) || c5 === 0x2F)) {
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// "meta" + space or /
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i += 6;
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let gotPragma = false;
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let needPragma = null;
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let charset = null;
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let attrRes;
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do {
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attrRes = getAttribute(buffer, i, l);
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if (attrRes.attr) {
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if (attrRes.attr.name === "http-equiv") {
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gotPragma = attrRes.attr.value === "content-type";
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} else if (attrRes.attr.name === "content" && !charset) {
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charset = extractCharacterEncodingFromMeta(attrRes.attr.value);
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if (charset !== null) {
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needPragma = true;
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}
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} else if (attrRes.attr.name === "charset") {
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charset = whatwgEncoding.labelToName(attrRes.attr.value);
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needPragma = false;
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}
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}
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i = attrRes.i;
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} while (attrRes.attr);
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if (needPragma === null) {
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continue;
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}
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if (needPragma === true && gotPragma === false) {
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continue;
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}
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if (charset === null) {
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continue;
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}
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if (charset === "UTF-16LE" || charset === "UTF-16BE") {
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charset = "UTF-8";
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}
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if (charset === "x-user-defined") {
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charset = "windows-1252";
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}
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return charset;
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} else if ((c1 >= 0x41 && c1 <= 0x5A) || (c1 >= 0x61 && c1 <= 0x7A)) {
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// a-z or A-Z
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for (i += 2; i < l; i++) {
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c = buffer[i];
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// space or >
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if (isSpaceCharacter(c) || c === 0x3E) {
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break;
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}
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}
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let attrRes;
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do {
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attrRes = getAttribute(buffer, i, l);
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i = attrRes.i;
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} while (attrRes.attr);
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} else if (c1 === 0x21 || c1 === 0x2F || c1 === 0x3F) {
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// ! or / or ?
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for (i += 2; i < l; i++) {
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c = buffer[i];
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// >
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if (c === 0x3E) {
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break;
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}
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}
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}
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}
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}
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return null;
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}
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// https://html.spec.whatwg.org/multipage/syntax.html#concept-get-attributes-when-sniffing
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function getAttribute(buffer, i, l) {
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for (; i < l; i++) {
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let c = buffer[i];
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// space or /
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if (isSpaceCharacter(c) || c === 0x2F) {
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continue;
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}
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// ">"
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if (c === 0x3E) {
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i++;
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break;
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}
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let name = "";
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let value = "";
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nameLoop:for (; i < l; i++) {
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c = buffer[i];
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// "="
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if (c === 0x3D && name !== "") {
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i++;
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break;
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}
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// space
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if (isSpaceCharacter(c)) {
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for (i++; i < l; i++) {
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c = buffer[i];
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// space
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if (isSpaceCharacter(c)) {
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continue;
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}
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// not "="
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if (c !== 0x3D) {
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return { attr: { name, value }, i };
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}
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i++;
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break nameLoop;
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}
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break;
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}
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// / or >
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if (c === 0x2F || c === 0x3E) {
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return { attr: { name, value }, i };
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}
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// A-Z
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if (c >= 0x41 && c <= 0x5A) {
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name += String.fromCharCode(c + 0x20); // lowercase
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} else {
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name += String.fromCharCode(c);
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}
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}
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c = buffer[i];
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// space
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if (isSpaceCharacter(c)) {
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for (i++; i < l; i++) {
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c = buffer[i];
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// space
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if (isSpaceCharacter(c)) {
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continue;
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} else {
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break;
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}
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}
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}
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// " or '
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if (c === 0x22 || c === 0x27) {
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const quote = c;
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for (i++; i < l; i++) {
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c = buffer[i];
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if (c === quote) {
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i++;
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return { attr: { name, value }, i };
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}
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// A-Z
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if (c >= 0x41 && c <= 0x5A) {
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value += String.fromCharCode(c + 0x20); // lowercase
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} else {
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value += String.fromCharCode(c);
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}
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}
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}
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// >
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if (c === 0x3E) {
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return { attr: { name, value }, i };
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}
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// A-Z
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if (c >= 0x41 && c <= 0x5A) {
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value += String.fromCharCode(c + 0x20); // lowercase
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} else {
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value += String.fromCharCode(c);
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}
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for (i++; i < l; i++) {
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c = buffer[i];
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// space or >
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if (isSpaceCharacter(c) || c === 0x3E) {
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return { attr: { name, value }, i };
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}
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// A-Z
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if (c >= 0x41 && c <= 0x5A) {
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value += String.fromCharCode(c + 0x20); // lowercase
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} else {
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value += String.fromCharCode(c);
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}
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}
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}
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return { i };
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}
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function extractCharacterEncodingFromMeta(string) {
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let position = 0;
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while (true) {
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let subPosition = string.substring(position).search(/charset/i);
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if (subPosition === -1) {
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return null;
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}
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subPosition += "charset".length;
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while (isSpaceCharacter(string[subPosition].charCodeAt(0))) {
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++subPosition;
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}
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if (string[subPosition] !== "=") {
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position = subPosition - 1;
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continue;
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}
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++subPosition;
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while (isSpaceCharacter(string[subPosition].charCodeAt(0))) {
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++subPosition;
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}
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position = subPosition;
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break;
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}
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if (string[position] === "\"" || string[position] === "'") {
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const nextIndex = string.indexOf(string[position], position + 1);
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if (nextIndex !== -1) {
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return whatwgEncoding.labelToName(string.substring(position + 1, nextIndex));
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}
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// It is an unmatched quotation mark
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return null;
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}
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if (string.length === position + 1) {
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return null;
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}
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let end = string.substring(position + 1).search(/\x09|\x0A|\x0C|\x0D|\x20|;/);
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if (end === -1) {
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end = string.length;
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}
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return whatwgEncoding.labelToName(string.substring(position, end));
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}
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function isSpaceCharacter(c) {
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return c === 0x09 || c === 0x0A || c === 0x0C || c === 0x0D || c === 0x20;
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}
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31
node_modules/html-encoding-sniffer/package.json
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31
node_modules/html-encoding-sniffer/package.json
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{
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"name": "html-encoding-sniffer",
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"description": "Sniff the encoding from a HTML byte stream",
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"keywords": [
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"encoding",
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"html"
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],
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"version": "1.0.2",
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"author": "Domenic Denicola <d@domenic.me> (https://domenic.me/)",
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"license": "MIT",
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"repository": "jsdom/html-encoding-sniffer",
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"main": "lib/html-encoding-sniffer.js",
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"files": [
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"lib/"
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],
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"scripts": {
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"test": "mocha",
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"lint": "eslint lib test"
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},
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"dependencies": {
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"whatwg-encoding": "^1.0.1"
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},
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"devDependencies": {
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"eslint": "^3.8.0",
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"mocha": "^3.1.2"
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}
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,"_resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-1.0.2.tgz"
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,"_integrity": "sha512-71lZziiDnsuabfdYiUeWdCVyKuqwWi23L8YeIgV9jSSZHCtb6wB1BKWooH7L3tn4/FuZJMVWyNaIDr4RGmaSYw=="
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,"_from": "html-encoding-sniffer@1.0.2"
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}
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