Repository navigation
Expand file tree
/
Copy pathstring.js
More file actions
270 lines (244 loc) · 8.86 KB
/
Copy pathstring.js
File metadata and controls
270 lines (244 loc) · 8.86 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
const ASCII_LOWERCASE = "abcdefghijklmnopqrstuvwxyz";
const ASCII_UPPERCASE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ASCII_LETTERS = ASCII_LOWERCASE + ASCII_UPPERCASE;
const HIGH_SURROGATE_BEGIN = 0xD800;
const HIGH_SURROGATE_END = 0xDBFF;
const LOW_SURROGATE_BEGIN = 0xDC00;
const LOW_SURROGATE_END = 0xDFFF;
const ZERO_WIDTH_JOINER = 0x200D;
// Flag emoji
const REGIONAL_INDICATOR_BEGIN = 0x1F1E6;
const REGIONAL_INDICATOR_END = 0x1F1FF;
// Skin color modifications to emoji
const FITZPATRICK_MODIFIER_BEGIN = 0x1F3FB;
const FITZPATRICK_MODIFIER_END = 0x1F3FF;
// Accent characters
const DIACRITICAL_MARKS_BEGIN = 0x20D0;
const DIACRITICAL_MARKS_END = 0x20FF;
// Special emoji joins
const VARIATION_MODIFIER_BEGIN = 0xFE00;
const VARIATION_MODIFIER_END = 0xFE0F;
function getCodePointData(string, i = 0) {
const size = string.length;
// Account for out-of-bounds indices:
if (i < 0 || i >= size) {
return null;
}
const first = string.charCodeAt(i);
if (size > 1 && first >= HIGH_SURROGATE_BEGIN && first <= HIGH_SURROGATE_END) {
const second = string.charCodeAt(i + 1);
if (second >= LOW_SURROGATE_BEGIN && second <= LOW_SURROGATE_END) {
// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
return {
code: (first - HIGH_SURROGATE_BEGIN) * 0x400 + second - LOW_SURROGATE_BEGIN + 0x10000,
long: true
};
}
}
return {
code: first,
long: false
};
}
function isCodeBetween(string, begin, end) {
if (!string)
return false;
const codeData = getCodePointData(string);
if (codeData) {
const code = codeData.code;
return code >= begin && code <= end;
}
return false;
}
function numCharsToTakeForNextSymbol(string, index) {
if (index === string.length - 1) {
// Last character in the string, so we can only take 1
return 1;
}
if (isCodeBetween(string[index], HIGH_SURROGATE_BEGIN, HIGH_SURROGATE_END)) {
const first = string.substring(index, index + 2);
const second = string.substring(index + 2, index + 4);
// check if second character is fitzpatrick (color) modifier
// or if this is a pair of regional indicators (a flag)
if (isCodeBetween(second, FITZPATRICK_MODIFIER_BEGIN, FITZPATRICK_MODIFIER_END) ||
(isCodeBetween(first, REGIONAL_INDICATOR_BEGIN, REGIONAL_INDICATOR_END) &&
isCodeBetween(second, REGIONAL_INDICATOR_BEGIN, REGIONAL_INDICATOR_END))
) {
return 4;
}
// check if next character is a modifier, in which case we should return it
if (isCodeBetween(second, VARIATION_MODIFIER_BEGIN, VARIATION_MODIFIER_END)) {
return 3;
}
// return surrogate pair
return 2;
}
// check if next character is the emoji modifier, in which case we should include it
if (isCodeBetween(string[index + 1], VARIATION_MODIFIER_BEGIN, VARIATION_MODIFIER_END)) {
return 2;
}
// just a regular character
return 1;
}
/**
* @namespace
* @name string
* @description Extended String API.
*/
const string = {
/**
* @constant
* @type {string}
* @name string.ASCII_LOWERCASE
* @description All lowercase letters.
*/
ASCII_LOWERCASE: ASCII_LOWERCASE,
/**
* @constant
* @type {string}
* @name string.ASCII_UPPERCASE
* @description All uppercase letters.
*/
ASCII_UPPERCASE: ASCII_UPPERCASE,
/**
* @constant
* @type {string}
* @name string.ASCII_LETTERS
* @description All ASCII letters.
*/
ASCII_LETTERS: ASCII_LETTERS,
/**
* @function
* @name string.format
* @description Return a string with {n} replaced with the n-th argument.
* @param {string} s - The string to format.
* @param {object} [arguments] - All other arguments are substituted into the string.
* @returns {string} The formatted string.
* @example
* var s = pc.string.format("Hello {0}", "world");
* console.log(s); // Prints "Hello world"
*/
format: function (s) {
for (let i = 1; i < arguments.length; i++) {
s = s.replace('{' + (i - 1) + '}', arguments[i]);
}
return s;
},
/**
* @function
* @name string.toBool
* @description Convert a string value to a boolean. In non-strict mode (the default), 'true' is converted to true, all other values
* are converted to false. In strict mode, 'true' is converted to true, 'false' is converted to false, all other values will throw
* an Exception.
* @param {string} s - The string to convert.
* @param {boolean} [strict] - In strict mode an Exception is thrown if s is not an accepted string value. Defaults to false.
* @returns {boolean} The converted value.
*/
toBool: function (s, strict = false) {
if (s === 'true') {
return true;
}
if (strict) {
if (s === 'false') {
return false;
}
throw new TypeError('Not a boolean string');
}
return false;
},
/**
* @function
* @name string.getCodePoint
* @description Get the code point number for a character in a string. Polyfill for
* [`codePointAt`]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt}.
* @param {string} string - The string to get the code point from.
* @param {number} [i] - The index in the string.
* @returns {number} The code point value for the character in the string.
*/
getCodePoint: function (string, i) {
const codePointData = getCodePointData(string, i);
return codePointData && codePointData.code;
},
/**
* @function
* @name string.getCodePoints
* @description Gets an array of all code points in a string.
* @param {string} string - The string to get code points from.
* @returns {number[]} The code points in the string.
*/
getCodePoints: function (string) {
if (typeof string !== 'string') {
throw new TypeError('Not a string');
}
let i = 0;
const arr = [];
let codePoint;
while (!!(codePoint = getCodePointData(string, i))) {
arr.push(codePoint.code);
i += codePoint.long ? 2 : 1;
}
return arr;
},
/**
* @function
* @name string.getSymbols
* @description Gets an array of all grapheme clusters (visible symbols) in a string. This is needed because
* some symbols (such as emoji or accented characters) are actually made up of multiple character codes. See
* {@link https://mathiasbynens.be/notes/javascript-unicode here} for more info.
* @param {string} string - The string to break into symbols.
* @returns {string[]} The symbols in the string.
*/
getSymbols: function (string) {
if (typeof string !== 'string') {
throw new TypeError('Not a string');
}
let index = 0;
const length = string.length;
const output = [];
let take = 0;
let ch;
while (index < length) {
take += numCharsToTakeForNextSymbol(string, index + take);
ch = string[index + take];
// Handle special cases
if (isCodeBetween(ch, DIACRITICAL_MARKS_BEGIN, DIACRITICAL_MARKS_END)) {
ch = string[index + (take++)];
}
if (isCodeBetween(ch, VARIATION_MODIFIER_BEGIN, VARIATION_MODIFIER_END)) {
ch = string[index + (take++)];
}
if (ch && ch.charCodeAt(0) === ZERO_WIDTH_JOINER) {
ch = string[index + (take++)];
// Not a complete char yet
continue;
}
const char = string.substring(index, index + take);
output.push(char);
index += take;
take = 0;
}
return output;
},
/**
* @function
* @name string.fromCodePoint
* @description Get the string for a given code point or set of code points. Polyfill for
* [`fromCodePoint`]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint}.
* @param {...number} args - The code points to convert to a string.
* @returns {string} The converted string.
*/
fromCodePoint: function (/* ...args */) {
const chars = [];
let current;
let codePoint;
let units;
for (let i = 0; i < arguments.length; ++i) {
current = Number(arguments[i]);
codePoint = current - 0x10000;
units = current > 0xFFFF ? [(codePoint >> 10) + 0xD800, (codePoint % 0x400) + 0xDC00] : [current];
chars.push(String.fromCharCode.apply(null, units));
}
return chars.join('');
}
};
export { string };