1 files changed, 131 insertions, 0 deletions
diff --git a/tools/eslint/node_modules/stringify-entities/index.js b/tools/eslint/node_modules/stringify-entities/index.js
new file mode 100644
index 0000000000..93ab625d1e
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+++ b/tools/eslint/node_modules/stringify-entities/index.js
@@ -0,0 +1,131 @@
+'use strict';
+
+var entities = require('character-entities-html4');
+var legacy = require('character-entities-legacy');
+var has = require('has');
+var hexadecimal = require('is-hexadecimal');
+var alphanumerical = require('is-alphanumerical');
+var dangerous = require('./dangerous.json');
+
+/* Expose. */
+module.exports = encode;
+
+encode.escape = escape;
+
+/* List of enforced escapes. */
+var escapes = ['"', '\'', '<', '>', '&', '`'];
+
+/* Map of characters to names. */
+var characters = construct();
+
+/* Default escapes. */
+var EXPRESSION_ESCAPE = toExpression(escapes);
+
+/* Surrogate pairs. */
+var EXPRESSION_SURROGATE_PAIR = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
+
+/* Non-ASCII characters. */
+// eslint-disable-next-line no-control-regex
+var EXPRESSION_BMP = /[\x01-\t\x0B\f\x0E-\x1F\x7F\x81\x8D\x8F\x90\x9D\xA0-\uFFFF]/g;
+
+/* Encode special characters in `value`. */
+function encode(value, options) {
+  var settings = options || {};
+  var subset = settings.subset;
+  var set = subset ? toExpression(subset) : EXPRESSION_ESCAPE;
+  var escapeOnly = settings.escapeOnly;
+  var omit = settings.omitOptionalSemicolons;
+
+  value = value.replace(set, function (char, pos, val) {
+    return one(char, val.charAt(pos + 1), settings);
+  });
+
+  if (subset || escapeOnly) {
+    return value;
+  }
+
+  return value
+    .replace(EXPRESSION_SURROGATE_PAIR, function (pair, pos, val) {
+      return toHexReference(
+        ((pair.charCodeAt(0) - 0xD800) * 0x400) +
+        pair.charCodeAt(1) - 0xDC00 + 0x10000,
+        val.charAt(pos + 2),
+        omit
+      );
+    })
+    .replace(EXPRESSION_BMP, function (char, pos, val) {
+      return one(char, val.charAt(pos + 1), settings);
+    });
+}
+
+/* Shortcut to escape special characters in HTML. */
+function escape(value) {
+  return encode(value, {
+    escapeOnly: true,
+    useNamedReferences: true
+  });
+}
+
+/* Encode `char` according to `options`. */
+function one(char, next, options) {
+  var shortest = options.useShortestReferences;
+  var omit = options.omitOptionalSemicolons;
+  var named;
+  var numeric;
+
+  if (
+    (shortest || options.useNamedReferences) &&
+    has(characters, char)
+  ) {
+    named = toNamed(characters[char], next, omit, options.attribute);
+  }
+
+  if (shortest || !named) {
+    numeric = toHexReference(char.charCodeAt(0), next, omit);
+  }
+
+  if (named && (!shortest || named.length < numeric.length)) {
+    return named;
+  }
+
+  return numeric;
+}
+
+/* Transform `code` into an entity. */
+function toNamed(name, next, omit, attribute) {
+  var value = '&' + name;
+
+  if (
+    omit &&
+    has(legacy, name) &&
+    dangerous.indexOf(name) === -1 &&
+    (!attribute || (next && next !== '=' && !alphanumerical(next)))
+  ) {
+    return value;
+  }
+
+  return value + ';';
+}
+
+/* Transform `code` into a hexadecimal character reference. */
+function toHexReference(code, next, omit) {
+  var value = '&#x' + code.toString(16).toUpperCase();
+  return omit && next && !hexadecimal(next) ? value : value + ';';
+}
+
+/* Create an expression for `characters`. */
+function toExpression(characters) {
+  return new RegExp('[' + characters.join('') + ']', 'g');
+}
+
+/* Construct the map. */
+function construct() {
+  var chars = {};
+  var name;
+
+  for (name in entities) {
+    chars[entities[name]] = name;
+  }
+
+  return chars;
+}