> For the complete documentation index, see [llms.txt](https://docs.urbit.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.urbit.org/hoon/stdlib/5b.md).

# 5b: Macro Expansion

Internal macro expansion utilities used by the Hoon compiler for syntax transformations.

These functions are used internally by the compiler. They should not be used directly and are only listed here for completeness.

## `+ah` <a href="#ah" id="ah"></a>

Tiki engine.

#### Source

```hoon
++  ah
  |_  tik=tiki
  ++  blue
    |=  gen=hoon
    ^-  hoon
    ?.  &(?=(%| -.tik) ?=(~ p.tik))  gen
    [%tsgr [%$ 3] gen]
  ::
  ++  teal
    |=  mod=spec
    ^-  spec
    ?:  ?=(%& -.tik)  mod
    [%over [%& 3]~ mod]
  ::
  ++  tele
    |=  syn=skin
    ^-  skin
    ?:  ?=(%& -.tik)  syn
    [%over [%& 3]~ syn]
  ::
  ++  gray
    |=  gen=hoon
    ^-  hoon
    ?-  -.tik
      %&  ?~(p.tik gen [%tstr [u.p.tik ~] [%wing q.tik] gen])
      %|  [%tsls ?~(p.tik q.tik [%ktts u.p.tik q.tik]) gen]
    ==
  ::
  ++  puce
    ^-  wing
    ?-  -.tik
      %&  ?~(p.tik q.tik [u.p.tik ~])
      %|  [[%& 2] ~]
    ==
  ::
  ++  wthp  |=  opt=(list (pair spec hoon))
            %+  gray  %wthp
            [puce (turn opt |=([a=spec b=hoon] [a (blue b)]))]
  ++  wtkt  |=([sic=hoon non=hoon] (gray [%wtkt puce (blue sic) (blue non)]))
  ++  wtls  |=  [gen=hoon opt=(list (pair spec hoon))]
            %+  gray  %wtls
            [puce (blue gen) (turn opt |=([a=spec b=hoon] [a (blue b)]))]
  ++  wtpt  |=([sic=hoon non=hoon] (gray [%wtpt puce (blue sic) (blue non)]))
  ++  wtsg  |=([sic=hoon non=hoon] (gray [%wtsg puce (blue sic) (blue non)]))
  ++  wthx  |=(syn=skin (gray [%wthx (tele syn) puce]))
  ++  wtts  |=(mod=spec (gray [%wtts (teal mod) puce]))
  --
::
```

***

## `+ax` <a href="#ax" id="ax"></a>

Spec engine.

#### Source

This core is very large, refer to `hoon.hoon` for the source.

***

## `+ap` <a href="#ap" id="ap"></a>

Hoon engine.

#### Source

This core is very large, refer to `hoon.hoon` for the source.

***


---

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