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'use strict';
module.exports = function substr(str, start, len) {
// discuss at: http://locutus.io/php/substr/
// original by: Martijn Wieringa
// bugfixed by: T.Wild
// improved by: Onno Marsman (https://twitter.com/onnomarsman)
// improved by: Brett Zamir (http://brett-zamir.me)
// revised by: Theriault (https://github.com/Theriault)
// note 1: Handles rare Unicode characters if 'unicode.semantics' ini (PHP6) is set to 'on'
// example 1: substr('abcdef', 0, -1)
// returns 1: 'abcde'
// example 2: substr(2, 0, -6)
// returns 2: false
// example 3: ini_set('unicode.semantics', 'on')
// example 3: substr('a\uD801\uDC00', 0, -1)
// returns 3: 'a'
// example 4: ini_set('unicode.semantics', 'on')
// example 4: substr('a\uD801\uDC00', 0, 2)
// returns 4: 'a\uD801\uDC00'
// example 5: ini_set('unicode.semantics', 'on')
// example 5: substr('a\uD801\uDC00', -1, 1)
// returns 5: '\uD801\uDC00'
// example 6: ini_set('unicode.semantics', 'on')
// example 6: substr('a\uD801\uDC00z\uD801\uDC00', -3, 2)
// returns 6: '\uD801\uDC00z'
// example 7: ini_set('unicode.semantics', 'on')
// example 7: substr('a\uD801\uDC00z\uD801\uDC00', -3, -1)
// returns 7: '\uD801\uDC00z'
// test: skip-3 skip-4 skip-5 skip-6 skip-7
str += '';
var end = str.length;
var iniVal = (typeof require !== 'undefined' ? require('../info/ini_get')('unicode.emantics') : undefined) || 'off';
if (iniVal === 'off') {
// assumes there are no non-BMP characters;
// if there may be such characters, then it is best to turn it on (critical in true XHTML/XML)
if (start < 0) {
start += end;
}
if (typeof len !== 'undefined') {
if (len < 0) {
end = len + end;
} else {
end = len + start;
}
}
// PHP returns false if start does not fall within the string.
// PHP returns false if the calculated end comes before the calculated start.
// PHP returns an empty string if start and end are the same.
// Otherwise, PHP returns the portion of the string from start to end.
if (start >= str.length || start < 0 || start > end) {
return false;
}
return str.slice(start, end);
}
// Full-blown Unicode including non-Basic-Multilingual-Plane characters
var i = 0;
var allBMP = true;
var es = 0;
var el = 0;
var se = 0;
var ret = '';
for (i = 0; i < str.length; i++) {
if (/[\uD800-\uDBFF]/.test(str.charAt(i)) && /[\uDC00-\uDFFF]/.test(str.charAt(i + 1))) {
allBMP = false;
break;
}
}
if (!allBMP) {
if (start < 0) {
for (i = end - 1, es = start += end; i >= es; i--) {
if (/[\uDC00-\uDFFF]/.test(str.charAt(i)) && /[\uD800-\uDBFF]/.test(str.charAt(i - 1))) {
start--;
es--;
}
}
} else {
var surrogatePairs = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
while (surrogatePairs.exec(str) !== null) {
var li = surrogatePairs.lastIndex;
if (li - 2 < start) {
start++;
} else {
break;
}
}
}
if (start >= end || start < 0) {
return false;
}
if (len < 0) {
for (i = end - 1, el = end += len; i >= el; i--) {
if (/[\uDC00-\uDFFF]/.test(str.charAt(i)) && /[\uD800-\uDBFF]/.test(str.charAt(i - 1))) {
end--;
el--;
}
}
if (start > end) {
return false;
}
return str.slice(start, end);
} else {
se = start + len;
for (i = start; i < se; i++) {
ret += str.charAt(i);
if (/[\uD800-\uDBFF]/.test(str.charAt(i)) && /[\uDC00-\uDFFF]/.test(str.charAt(i + 1))) {
// Go one further, since one of the "characters" is part of a surrogate pair
se++;
}
}
return ret;
}
}
};
//# sourceMappingURL=substr.js.map
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