nl_tokens: update handler
pl_tokens: function _update ( ) { if ( d . $destroyed ) return consoler . warn ( 'Directive "' + <mask> + '" already destroyed.' ) var hasDiff = false // empty expression also can trigger update, such `r-text` directive if ( ! isExpr || isConst ) { if ( shouldUpdate && shouldUpdate . call ( d ) ) { upda && upda . call ( d ) } } else { var nexv = d . $exec ( expr , mutable || ! customDiff ) // [error, result] var r = nexv [ 1 ] var payload = { } if ( ! nexv [ 0 ] ) { if ( customDiff ) { hasDiff = customDiff . call ( d , r , prev ) } else { r = util . cloneAndDiff ( r , prev , payload ) hasDiff = ! ! payload . diff } if ( hasDiff && ( ! shouldUpdate || shouldUpdate . call ( d , r , prev ) ) ) { var p = prev prev = r upda && upda . call ( d , r , p ) } } } afterUpdate && afterUpdate . call ( d , hasDiff ) }