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plural-exp.js
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plural-exp.js
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'use strict';
/* Parse STR and return a function that receives a variable n and
* manipulates the variables nplurals and plural.
*/
function pluralExpression(str) {
var tokens = str.replace(/[ \t\r\013\014]/g, '')
.replace(/;$/, '')
// Do NOT allow square brackets here. JSFuck!
.split(/[<>!=]=|&&|\|\||[-!\*\/%+<>=?:;]/);
for (var i = 0; i < tokens.length; ++i) {
var token = tokens[i].replace(/^\(+/, '').replace(/\)+$/, '');
if (token !== 'nplurals'
&& token !== 'plural'
&& token !== 'n'
// Does not catch invalid octal numbers but the compiler
// takes care of that.
&& null === token.match(/^[0-9]+$/)) {
return germanicPlural;
}
}
try {
var code = 'var nplurals=1, plural=0;'
+ str
+ '; return [0 + nplurals, 0 + plural]';
return new Function('n', code);
}
catch(e) {
return function() { return germanicPlural; };
}
}
function germanicPlural(n) {
return [2, n == 1 ? 0 : 1];
}
module.exports = pluralExpression;