зеркало из https://github.com/mozilla/pjs.git
66 строки
1.8 KiB
JavaScript
66 строки
1.8 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
String.prototype.format = function string_format() {
|
|
// there are two modes of operation... unnamed indices are read in order;
|
|
// named indices using %(name)s. The two styles cannot be mixed.
|
|
// Unnamed indices can be passed as either a single argument to this function,
|
|
// multiple arguments to this function, or as a single array argument
|
|
let curindex = 0;
|
|
let d;
|
|
|
|
if (arguments.length > 1) {
|
|
d = arguments;
|
|
}
|
|
else
|
|
d = arguments[0];
|
|
|
|
function r(s, key, type) {
|
|
if (type == '%')
|
|
return '%';
|
|
|
|
let v;
|
|
if (key == "") {
|
|
if (curindex == -1)
|
|
throw Error("Cannot mix named and positional indices in string formatting.");
|
|
|
|
if (curindex == 0 && (!(d instanceof Object) || !(0 in d))) {
|
|
v = d;
|
|
}
|
|
else if (!(curindex in d))
|
|
throw Error("Insufficient number of items in format, requesting item %i".format(curindex));
|
|
else {
|
|
v = d[curindex];
|
|
}
|
|
|
|
++curindex;
|
|
}
|
|
else {
|
|
key = key.slice(1, -1);
|
|
if (curindex > 0)
|
|
throw Error("Cannot mix named and positional indices in string formatting.");
|
|
curindex = -1;
|
|
|
|
if (!(key in d))
|
|
throw Error("Key '%s' not present during string substitution.".format(key));
|
|
v = d[key];
|
|
}
|
|
switch (type) {
|
|
case "s":
|
|
if (v === undefined)
|
|
return "<undefined>";
|
|
return v.toString();
|
|
case "r":
|
|
return uneval(v);
|
|
case "i":
|
|
return parseInt(v);
|
|
case "f":
|
|
return Number(v);
|
|
default:
|
|
throw Error("Unexpected format character '%s'.".format(type));
|
|
}
|
|
}
|
|
return this.replace(/%(\([^)]+\))?(.)/g, r);
|
|
};
|