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Moved slide-window 'up file' so declaration is before use.

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This commit is contained in:
Simon Brooke 2013-11-07 23:44:38 +00:00
parent 997f665e37
commit 9e2d02b82d
1 changed files with 17 additions and 15 deletions
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32
src/milkwood_clj/core.clj
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@ -9,6 +9,23 @@
;;;; utilities - probably in the fullness of time a separate file
(defn slide-window
"slide this lookback window. A lookback window is a list of at most depth tokens;
we slide it by appending this token to its tail, and possibly removing a token from
its head to make room. Oviously, we do this by compying, not by destructive
modification.
window: a flat sequence of tokens of length less than or equal to depth;
token: a token to append;
depth: the maximum length of the window."
[window token depth]
(let [newwindow (concat window (list token))]
(cond
(> (count newwindow) depth) (rest newwindow)
true newwindow)))
;; copied verbatim from old (pre 1.3) clojure.contrib; cant find where it's moved
;; to in new contrib structure.
;; see https://github.com/clojure/clojure-contrib/blob/master/modules/map-utils/src/main/clojure/clojure/contrib/map_utils.clj
@ -86,21 +103,6 @@
;;;; write side
(defn slide-window
"slide this lookback window. A lookback window is a list of at most depth tokens;
we slide it by appending this token to its tail, and possibly removing a token from
its head to make room. Oviously, we do this by compying, not by destructive
modification.
window: a flat sequence of tokens of length less than or equal to depth;
token: a token to append;
depth: the maximum length of the window."
[window token depth]
(let [newwindow (concat window (list token))]
(cond
(> (count newwindow) depth) (rest newwindow)
true newwindow)))
(defn next-tokens
"Given these rules and this path, return a list of valid next tokens to emit.