playcanvas
Version:
PlayCanvas WebGL game engine
136 lines (134 loc) • 4.16 kB
JavaScript
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;
const REGIONAL_INDICATOR_BEGIN = 0x1F1E6;
const REGIONAL_INDICATOR_END = 0x1F1FF;
const FITZPATRICK_MODIFIER_BEGIN = 0x1F3FB;
const FITZPATRICK_MODIFIER_END = 0x1F3FF;
const DIACRITICAL_MARKS_BEGIN = 0x20D0;
const DIACRITICAL_MARKS_END = 0x20FF;
const VARIATION_MODIFIER_BEGIN = 0xFE00;
const VARIATION_MODIFIER_END = 0xFE0F;
function getCodePointData(string, i = 0) {
const size = string.length;
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) {
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) {
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);
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;
}
if (isCodeBetween(second, VARIATION_MODIFIER_BEGIN, VARIATION_MODIFIER_END)) {
return 3;
}
return 2;
}
if (isCodeBetween(string[index + 1], VARIATION_MODIFIER_BEGIN, VARIATION_MODIFIER_END)) {
return 2;
}
return 1;
}
const string = {
ASCII_LOWERCASE: ASCII_LOWERCASE,
ASCII_UPPERCASE: ASCII_UPPERCASE,
ASCII_LETTERS: ASCII_LETTERS,
format (s, ...args) {
for(let i = 0; i < args.length; i++){
s = s.replace(`{${i}}`, args[i]);
}
return s;
},
getCodePoint (string, i) {
const codePointData = getCodePointData(string, i);
return codePointData && codePointData.code;
},
getCodePoints (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;
},
getSymbols (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];
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++];
continue;
}
const char = string.substring(index, index + take);
output.push(char);
index += take;
take = 0;
}
return output;
},
fromCodePoint (...args) {
return args.map((codePoint)=>{
if (codePoint > 0xFFFF) {
codePoint -= 0x10000;
return String.fromCharCode((codePoint >> 10) + 0xD800, codePoint % 0x400 + 0xDC00);
}
return String.fromCharCode(codePoint);
}).join('');
}
};
export { string };