兼容低版本 IE 的 JScript 5.5 实现(4)

var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding");
e.name = "URIError";
e.message = e.description;
throw(e);
@end
}
function checkcode() {
var d1, d2;
d1 = str.charAt(i );
d2 = str.charAt(i );
if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) {
return throwerror();
}
return parseInt(d1 d2, 16);
}
function checkutf8() {
var c = str.charCodeAt(i );
if (c == 37) {
if ((c = checkcode()) == null) return null;
}
if ((c >> 6) != 2) {
return throwerror();
}
}
var out, i, len;
var c, c2, c3;

out = "";
len = str.length;
i = 0;
while(i < len) {
c = str.charCodeAt(i );
if (c == 37) {
if ((c = checkcode()) == null) return null;
}
else {
out = String.fromCharCode(c);
continue;
}
switch(c) {
case 35: case 36: case 38: case 43: case 44: case 47:
case 58: case 59: case 61: case 63: case 64: {
if (str.charCodeAt(i - 3) == 37) {
out = str.substr(i - 3, 3);
}
else {
out = str.substr(i - 1, 1);
}
break;
}
default: {
switch(c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: {
// 0xxxxxxx
out = String.fromCharCode(c);
break;
}
case 12: case 13: {
// 110x xxxx 10xx xxxx
if ((c2 = checkutf8()) == null) return null;
out = String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F));
break;
}
case 14: {
// 1110 xxxx 10xx xxxx 10xx xxxx
if ((c2 = checkutf8()) == null) return null;
if ((c3 = checkutf8()) == null) return null;
out = String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
default: {
out = String.fromCharCode(c);
file://return throwerror();
}
}
}
}
}
return out;
}

function decodeURIComponent(str) {
function throwerror() {
@if (@_jscript_version < 5)
return null;
@else
var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding");
e.name = "URIError";
e.message = e.description;
throw(e);
@end
}
function checkcode() {
var d1, d2;
d1 = str.charAt(i );
d2 = str.charAt(i );
if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) {
return throwerror();
}
return parseInt(d1 d2, 16);
}
function checkutf8() {
var c = str.charCodeAt(i );
if (c == 37) {
if ((c = checkcode()) == null) return null;
}
if ((c >> 6) != 2) {
return throwerror();
}
}
var out, i, len;
var c, c2, c3;

out = "";
len = str.length;
i = 0;
while(i < len) {
c = str.charCodeAt(i );
if (c == 37) {
if ((c = checkcode()) == null) return null;
}
else {
out = String.fromCharCode(c);
continue;
}
switch(c >> 4) {
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: {
// 0xxxxxxx
out = String.fromCharCode(c);
break;
}
case 12: case 13: {
// 110x xxxx 10xx xxxx
if ((c2 = checkutf8()) == null) return null;
out = String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F));
break;
}
case 14: {
// 1110 xxxx 10xx xxxx 10xx xxxx
if ((c2 = checkutf8()) == null) return null;
if ((c3 = checkutf8()) == null) return null;
out = String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |

标签：

版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点，本站所提供的摄影照片，插画，设计作品，如需使用，请与原作者联系，版权归原作者所有