Commit Graph

5 Commits

Author SHA1 Message Date
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