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* lisp/emacs-lisp/map.el: Improvements to the docstring of the pcase macro

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Nicolas Petton 2016-02-03 15:18:36 +01:00
parent 6191003fcd
commit 8b87ecb77d
1 changed files with 9 additions and 8 deletions
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17
lisp/emacs-lisp/map.el
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@ -47,17 +47,18 @@
(pcase-defmacro map (&rest args) (pcase-defmacro map (&rest args)
"Build a `pcase' pattern matching map elements. "Build a `pcase' pattern matching map elements.
The `pcase' pattern will match each element of PATTERN against ARGS is a list of elements to be matched in the map.
the corresponding elements of the map.
Extra elements of the map are ignored if fewer ARGS are Each element of ARGS can be of the form (KEY PAT), in which case KEY is
given, and the match does not fail. evaluated and searched for in the map. The match fails if for any KEY
found in the map, the corresponding PAT doesn't match the value
associated to the KEY.
ARGS can be a list of the form (KEY PAT), in which case KEY in an Each element can also be a SYMBOL, which is an abbreviation of a (KEY
unquoted form. PAT) tuple of the form ('SYMBOL SYMBOL).
ARGS can also be a list of symbols, which stands for ('SYMBOL Keys in ARGS not found in the map are ignored, and the match doesn't
SYMBOL)." fail."
`(and (pred mapp) `(and (pred mapp)
,@(map--make-pcase-bindings args))) ,@(map--make-pcase-bindings args)))