Commit Graph

8 Commits

Author SHA1 Message Date
Kodi Arfer
ed8e37da62 Burninate the synonyms true, false, and nil
Per the straw poll in #908, as an alternative to #1147.

Now you must use `True`, `False`, and `None`, as in Python. Or just assign `true` to `True`, etc.; the old synonyms aren't reserved words anymore.
2016-11-23 18:35:17 -08:00
Gergely Nagy
32f5d5dea7 Drop a set of brackets from with.
This changes with syntax from (with [[x (expr)] (expr)] ...) to (with
[x (expr) (expr)] ...). Should have no ill side effects apart from the
syntax change.

Closes #852.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2015-10-01 10:08:04 +02:00
Gergely Nagy
9f88e07e1d Drop a set of brackets from let.
This changes let to use a flat list of symbol-value pairs instead of a
vector of vectors. One side effect is that (let [[a 1] z]) is not
expressible now, and one will explicitly need to set a nil value for z,
such as: (let [a 1 z nil]).

Closes #713.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2015-10-01 10:08:04 +02:00
Ryan Gonzalez
6c076f76f7 Allow 'for' and 'cond' to take a multi-expression body (closes #868) 2015-08-10 10:14:55 +02:00
Gergely Nagy
adc1cf8829
contrib.walk: Coerce non-list iterables into list form
Expressions can sometimes contain itertools.islice objects, which we can
only walk if we force them into a list. To do this, the walk function
has to be taught that collections that are not instances of list should
be forced into a list.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2015-07-15 16:59:49 +02:00
Gergely Nagy
e8dfe5bfb2
hy.contrib.walk: Add support for walking cons cells
Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2014-02-01 18:36:57 +01:00
Gergely Nagy
fa24042cb0 hy.contrib.walk: Add (macroexpand-all)
This function will recursively perform all possible macroexpansions in
the supplied form. Unfortunately, it also traverses into quasiquoted
parts, where it shouldn't, but it is a useful estimation of macro
expansion anyway.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2014-02-01 18:34:12 +01:00
Gergely Nagy
817b4688d8 hy.contrib.walk: New contrib module for walking the Hy AST
The hy.contrib.walk module provides a few functions to walk the Hy AST,
and potentially transform it along the way. The main entry point
is (walk), which takes two functions and a form as arguments, and
applies the first (inner) function to each element of the form, building
up a data structure of the same type as the original. Then applies outer
(the second function) to the result.

Two convenience functions are provided: (postwalk) and (prewalk), which
do a depth-first, post/pre-order traversal of the form.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
2014-02-01 18:34:12 +01:00