Class LXfork

Object
   |
   +--Lens
         |
         +--LXfork

class LXfork

extends Lens

Splits a concrete tree, passing part through one lens and part through another. Those parts which pass predicates pred_c and pred_a will go through pass_lens; whatever remains will be passed through fail_lens.

If either of pred_{a,c} are not actually predicates, they will be made into predicates by means of the Predicate constructor.
Defined in lens.js

Field Detail

name

Object name

LXfork

LXfork(<Predicate> pred_c, <Predicate> pred_a, <Lens> pass_lens, <Lens> fail_lens)

Parameters:
pred_c - A predicate over concrete-tree properties; those passing properties will be taken as a single object and passed through pass_lens in the get direction; in the putback direction, it will be used as the putback for pass_lens.
pred_a - A predicate over abstract-tree properties; those passing properties will be taken as a single object during putback, and will be passed (along with pred_c-passing properties) back through pass_lens's putback.
pass_lens - Used for passing properties
fail_lens - Used for failing properties

get

Object get(c)

putback

Object putback(a, c)