get: function (src) {
var keys = this.keys,
_keys = this._keys;
if (keys.pending) {
_keys.length = 0;
_keys.push.apply(_keys, utils.chain(keys).
map(function (key) {
var from, to, by;
switch (typeof key) {
case 'string':
case 'number':
return key;
case 'object':
if (!utils.isArray(key)) {
from = key.from || 0;
to = key.to + 1;
by = key.by || 1;
key = utils.range(from, to, by);
}
return key;
}
}).
flatten().
value());
keys.pending = false;
}
return utils.pick(src, _keys);
}
tokens: { get: function () {
if (!this._tokens) {
this._tokens = utils.chain(this).
keys().
map(function (key) {
var fn;
if (key !== 'define' &&
key !== 'tokens' &&
key !== 'parse' &&
(fn = exports[key]) &&
typeof fn === 'function' &&
fn.token instanceof RegExp
) {
return fn.token;
}
}).
compact().
sort(function (a, b) {
return b.source.length - a.source.length;
}).
value();
}
return this._tokens;
}, enumerable: true },