StringUtils.ts
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export namespace StringUtils {
export function getUrlParam(key: string): string {
if (!window.location.search) {
return ""; //微信版本没有此变量
}
const reg = new RegExp("(^|&)" + key + "=([^&]*)(&|$)");
const r = window.location.search.substr(1).match(reg);
if (r != null) return decodeURI(r[2]);
return "";
}
//js实现用传递的值替换占位符{0} {1} {2}
export function format(str: string, ...args: any[]): string {
if (args.length == 0) return str;
for (let i = 0; i < args.length; i++)
str = str.replace(new RegExp("\\{" + i + "\\}", "g"), args[i]);
return str;
}
export function str_repeat(i: string, m: number) {
for (var o: string[] = []; m > 0; o[--m] = i);
return o.join('');
}
export function sprintf(fmt: string, ...params: any[]): string {
var i = 0, a, f = fmt, o: any[] = [], m, p, c, x, s = '';
while (f) {
if (m = /^[^\x25]+/.exec(f)) {
o.push(m[0]);
}
else if (m = /^\x25{2}/.exec(f)) {
o.push('%');
}
else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
if (((a = params[(m[1] - 1) || i++]) == null) || (a == undefined)) {
throw ('Too few arguments.');
}
if (/[^s]/.test(m[7]) && (typeof (a) != 'number')) {
throw ('Expecting number but found ' + typeof (a));
}
switch (m[7]) {
case 'b': a = a.toString(2); break;
case 'c': a = String.fromCharCode(a); break;
case 'd': a = parseInt(a); break;
case 'e': a = m[6] ? a.toExponential(m[6]) : a.toExponential(); break;
case 'f': a = m[6] ? parseFloat(a).toFixed(m[6]) : parseFloat(a); break;
case 'o': a = a.toString(8); break;
case 's': a = ((a = String(a)) && m[6] ? a.substring(0, m[6]) : a); break;
case 'u': a = Math.abs(a); break;
case 'x': a = a.toString(16); break;
case 'X': a = a.toString(16).toUpperCase(); break;
}
a = (/[def]/.test(m[7]) && m[2] && a >= 0 ? '+' + a : a);
c = m[3] ? m[3] == '0' ? '0' : m[3].charAt(1) : ' ';
x = m[5] - String(a).length - s.length;
p = m[5] ? str_repeat(c, x) : '';
o.push(s + (m[4] ? a + p : p + a));
}
else {
throw ('Huh ?!');
}
f = f.substring(m[0].length);
}
return o.join('');
}
export function utf8ArrToStr(aBytes: Uint8Array) {
var sView = "";
for (var nPart, nLen = aBytes.length, nIdx = 0; nIdx < nLen; nIdx++) {
nPart = aBytes[nIdx];
sView += String.fromCharCode(nPart > 251 && nPart < 254
&& nIdx + 5 < nLen ? /* six bytes */
/* (nPart - 252 << 32) is not possible in ECMAScript! So...: */
(nPart - 252) * 1073741824 + (aBytes[++nIdx] - 128 << 24)
+ (aBytes[++nIdx] - 128 << 18) + (aBytes[++nIdx] - 128 << 12)
+ (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 247 && nPart < 252 && nIdx + 4 < nLen ? /*
* five
* bytes
*/
(nPart - 248 << 24) + (aBytes[++nIdx] - 128 << 18)
+ (aBytes[++nIdx] - 128 << 12)
+ (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 239 && nPart < 248 && nIdx + 3 < nLen ? /*
* four
* bytes
*/
(nPart - 240 << 18) + (aBytes[++nIdx] - 128 << 12)
+ (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx]
- 128 : nPart > 223 && nPart < 240
&& nIdx + 2 < nLen ? /* three bytes */
(nPart - 224 << 12) + (aBytes[++nIdx] - 128 << 6)
+ aBytes[++nIdx] - 128 : nPart > 191
&& nPart < 224 && nIdx + 1 < nLen ? /* two bytes */
(nPart - 192 << 6) + aBytes[++nIdx] - 128 : /*
* nPart <
* 127 ?
*//*
* one byte
*/
nPart);
}
return sView;
}
export function strToUtf8Arr(sDOMStr: string) {
var aBytes: Uint8Array, nChr, nStrLen = sDOMStr.length, nArrLen = 0;
/* mapping... */
for (var nMapIdx = 0; nMapIdx < nStrLen; nMapIdx++) {
nChr = sDOMStr.charCodeAt(nMapIdx);
nArrLen += nChr < 0x80 ? 1 : nChr < 0x800 ? 2 : nChr < 0x10000 ? 3
: nChr < 0x200000 ? 4 : nChr < 0x4000000 ? 5 : 6;
}
aBytes = new Uint8Array(nArrLen);
/* transcription... */
for (var nIdx = 0, nChrIdx = 0; nIdx < nArrLen; nChrIdx++) {
nChr = sDOMStr.charCodeAt(nChrIdx);
if (nChr < 128) {
/* one byte */
aBytes[nIdx++] = nChr;
} else if (nChr < 0x800) {
/* two bytes */
aBytes[nIdx++] = 192 + (nChr >>> 6);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x10000) {
/* three bytes */
aBytes[nIdx++] = 224 + (nChr >>> 12);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x200000) {
/* four bytes */
aBytes[nIdx++] = 240 + (nChr >>> 18);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x4000000) {
/* five bytes */
aBytes[nIdx++] = 248 + (nChr >>> 24);
aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else /* if (nChr <= 0x7fffffff) */ {
/* six bytes */
aBytes[nIdx++] = 252 + /*
* (nChr >>> 32) is not possible in
* ECMAScript! So...:
*/(nChr / 1073741824);
aBytes[nIdx++] = 128 + (nChr >>> 24 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
}
}
return aBytes;
}
}