30 lines
812 B
JavaScript
30 lines
812 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var trimStart = require('string.prototype.trimleft');
|
||
|
|
var trimEnd = require('string.prototype.trimright');
|
||
|
|
|
||
|
|
var GetIntrinsic = require('../GetIntrinsic');
|
||
|
|
|
||
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
||
|
|
|
||
|
|
var RequireObjectCoercible = require('./RequireObjectCoercible');
|
||
|
|
var ToString = require('./ToString');
|
||
|
|
|
||
|
|
// https://ecma-international.org/ecma-262/10.0/#sec-trimstring
|
||
|
|
|
||
|
|
module.exports = function TrimString(string, where) {
|
||
|
|
var str = RequireObjectCoercible(string);
|
||
|
|
var S = ToString(str);
|
||
|
|
var T;
|
||
|
|
if (where === 'start') {
|
||
|
|
T = trimStart(S);
|
||
|
|
} else if (where === 'end') {
|
||
|
|
T = trimEnd(S);
|
||
|
|
} else if (where === 'start+end') {
|
||
|
|
T = trimStart(trimEnd(S));
|
||
|
|
} else {
|
||
|
|
throw new $TypeError('Assertion failed: invalid `where` value; must be "start", "end", or "start+end"');
|
||
|
|
}
|
||
|
|
return T;
|
||
|
|
};
|