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Improve cl-do, cl-do* docstrings

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* lisp/emacs-lisp/cl-macs.el(cl-do, cl-do*):
Improve docstring (Bug#32803).
This commit is contained in:
Tino Calancha 2018-09-29 18:06:03 +09:00
parent d416109f06
commit 7296b6fbf2
1 changed files with 37 additions and 2 deletions
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39
lisp/emacs-lisp/cl-macs.el
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@ -1745,7 +1745,24 @@ such that COMBO is equivalent to (and . CLAUSES)."
;;;###autoload
(defmacro cl-do (steps endtest &rest body)
"The Common Lisp `do' loop.
"Bind variables and run BODY forms until END-TEST returns non-nil.
First, each VAR is bound to the associated INIT value as if by a `let' form.
Then, in each iteration of the loop, the END-TEST is evaluated; if true,
the loop is finished. Otherwise, the BODY forms are evaluated, then each
VAR is set to the associated STEP expression (as if by a `cl-psetq' form)
and the next iteration begins.
Once the END-TEST becomes true, the RESULT forms are evaluated (with
the VARs still bound to their values) to produce the result
returned by `cl-do'.
Note that the entire loop is enclosed in an implicit `nil' block, so
that you can use `cl-return' to exit at any time.
Also note that END-TEST is checked before evaluating BODY. If END-TEST
is initially non-nil, `cl-do' will exit without running BODY.
For more details, see `cl-do' description in Info node `(cl) Iteration'.
\(fn ((VAR INIT [STEP])...) (END-TEST [RESULT...]) BODY...)"
(declare (indent 2)
@ -1757,7 +1774,25 @@ such that COMBO is equivalent to (and . CLAUSES)."
;;;###autoload
(defmacro cl-do* (steps endtest &rest body)
"The Common Lisp `do*' loop.
"Bind variables and run BODY forms until END-TEST returns non-nil.
First, each VAR is bound to the associated INIT value as if by a `let*' form.
Then, in each iteration of the loop, the END-TEST is evaluated; if true,
the loop is finished. Otherwise, the BODY forms are evaluated, then each
VAR is set to the associated STEP expression (as if by a `setq'
form) and the next iteration begins.
Once the END-TEST becomes true, the RESULT forms are evaluated (with
the VARs still bound to their values) to produce the result
returned by `cl-do*'.
Note that the entire loop is enclosed in an implicit `nil' block, so
that you can use `cl-return' to exit at any time.
Also note that END-TEST is checked before evaluating BODY. If END-TEST
is initially non-nil, `cl-do*' will exit without running BODY.
This is to `cl-do' what `let*' is to `let'.
For more details, see `cl-do*' description in Info node `(cl) Iteration'.
\(fn ((VAR INIT [STEP])...) (END-TEST [RESULT...]) BODY...)"
(declare (indent 2) (debug cl-do))