Initial commit of clojure reimplementation of Milkwood. Most of the

read side working, write side started, top level function just sketched
and definitely not working.

LICENSE

@@ -0,0 +1,214 @@
+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
+LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM
+CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
+
+1. DEFINITIONS
+
+"Contribution" means:
+
+a) in the case of the initial Contributor, the initial code and
+documentation distributed under this Agreement, and
+
+b) in the case of each subsequent Contributor:
+
+i) changes to the Program, and
+
+ii) additions to the Program;
+
+where such changes and/or additions to the Program originate from and are
+distributed by that particular Contributor. A Contribution 'originates' from
+a Contributor if it was added to the Program by such Contributor itself or
+anyone acting on such Contributor's behalf. Contributions do not include
+additions to the Program which: (i) are separate modules of software
+distributed in conjunction with the Program under their own license
+agreement, and (ii) are not derivative works of the Program.
+
+"Contributor" means any person or entity that distributes the Program.
+
+"Licensed Patents" mean patent claims licensable by a Contributor which are
+necessarily infringed by the use or sale of its Contribution alone or when
+combined with the Program.
+
+"Program" means the Contributions distributed in accordance with this
+Agreement.
+
+"Recipient" means anyone who receives the Program under this Agreement,
+including all Contributors.
+
+2. GRANT OF RIGHTS
+
+a) Subject to the terms of this Agreement, each Contributor hereby grants
+Recipient a non-exclusive, worldwide, royalty-free copyright license to
+reproduce, prepare derivative works of, publicly display, publicly perform,
+distribute and sublicense the Contribution of such Contributor, if any, and
+such derivative works, in source code and object code form.
+
+b) Subject to the terms of this Agreement, each Contributor hereby grants
+Recipient a non-exclusive, worldwide, royalty-free patent license under
+Licensed Patents to make, use, sell, offer to sell, import and otherwise
+transfer the Contribution of such Contributor, if any, in source code and
+object code form.  This patent license shall apply to the combination of the
+Contribution and the Program if, at the time the Contribution is added by the
+Contributor, such addition of the Contribution causes such combination to be
+covered by the Licensed Patents. The patent license shall not apply to any
+other combinations which include the Contribution. No hardware per se is
+licensed hereunder.
+
+c) Recipient understands that although each Contributor grants the licenses
+to its Contributions set forth herein, no assurances are provided by any
+Contributor that the Program does not infringe the patent or other
+intellectual property rights of any other entity. Each Contributor disclaims
+any liability to Recipient for claims brought by any other entity based on
+infringement of intellectual property rights or otherwise. As a condition to
+exercising the rights and licenses granted hereunder, each Recipient hereby
+assumes sole responsibility to secure any other intellectual property rights
+needed, if any. For example, if a third party patent license is required to
+allow Recipient to distribute the Program, it is Recipient's responsibility
+to acquire that license before distributing the Program.
+
+d) Each Contributor represents that to its knowledge it has sufficient
+copyright rights in its Contribution, if any, to grant the copyright license
+set forth in this Agreement.
+
+3. REQUIREMENTS
+
+A Contributor may choose to distribute the Program in object code form under
+its own license agreement, provided that:
+
+a) it complies with the terms and conditions of this Agreement; and
+
+b) its license agreement:
+
+i) effectively disclaims on behalf of all Contributors all warranties and
+conditions, express and implied, including warranties or conditions of title
+and non-infringement, and implied warranties or conditions of merchantability
+and fitness for a particular purpose;
+
+ii) effectively excludes on behalf of all Contributors all liability for
+damages, including direct, indirect, special, incidental and consequential
+damages, such as lost profits;
+
+iii) states that any provisions which differ from this Agreement are offered
+by that Contributor alone and not by any other party; and
+
+iv) states that source code for the Program is available from such
+Contributor, and informs licensees how to obtain it in a reasonable manner on
+or through a medium customarily used for software exchange.
+
+When the Program is made available in source code form:
+
+a) it must be made available under this Agreement; and
+
+b) a copy of this Agreement must be included with each copy of the Program.
+
+Contributors may not remove or alter any copyright notices contained within
+the Program.
+
+Each Contributor must identify itself as the originator of its Contribution,
+if any, in a manner that reasonably allows subsequent Recipients to identify
+the originator of the Contribution.
+
+4. COMMERCIAL DISTRIBUTION
+
+Commercial distributors of software may accept certain responsibilities with
+respect to end users, business partners and the like. While this license is
+intended to facilitate the commercial use of the Program, the Contributor who
+includes the Program in a commercial product offering should do so in a
+manner which does not create potential liability for other Contributors.
+Therefore, if a Contributor includes the Program in a commercial product
+offering, such Contributor ("Commercial Contributor") hereby agrees to defend
+and indemnify every other Contributor ("Indemnified Contributor") against any
+losses, damages and costs (collectively "Losses") arising from claims,
+lawsuits and other legal actions brought by a third party against the
+Indemnified Contributor to the extent caused by the acts or omissions of such
+Commercial Contributor in connection with its distribution of the Program in
+a commercial product offering.  The obligations in this section do not apply
+to any claims or Losses relating to any actual or alleged intellectual
+property infringement. In order to qualify, an Indemnified Contributor must:
+a) promptly notify the Commercial Contributor in writing of such claim, and
+b) allow the Commercial Contributor tocontrol, and cooperate with the
+Commercial Contributor in, the defense and any related settlement
+negotiations. The Indemnified Contributor may participate in any such claim
+at its own expense.
+
+For example, a Contributor might include the Program in a commercial product
+offering, Product X. That Contributor is then a Commercial Contributor. If
+that Commercial Contributor then makes performance claims, or offers
+warranties related to Product X, those performance claims and warranties are
+such Commercial Contributor's responsibility alone. Under this section, the
+Commercial Contributor would have to defend claims against the other
+Contributors related to those performance claims and warranties, and if a
+court requires any other Contributor to pay any damages as a result, the
+Commercial Contributor must pay those damages.
+
+5. NO WARRANTY
+
+EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS PROVIDED ON
+AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER
+EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR
+CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A
+PARTICULAR PURPOSE. Each Recipient is solely responsible for determining the
+appropriateness of using and distributing the Program and assumes all risks
+associated with its exercise of rights under this Agreement , including but
+not limited to the risks and costs of program errors, compliance with
+applicable laws, damage to or loss of data, programs or equipment, and
+unavailability or interruption of operations.
+
+6. DISCLAIMER OF LIABILITY
+
+EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT NOR ANY
+CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION
+LOST PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE
+EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY
+OF SUCH DAMAGES.
+
+7. GENERAL
+
+If any provision of this Agreement is invalid or unenforceable under
+applicable law, it shall not affect the validity or enforceability of the
+remainder of the terms of this Agreement, and without further action by the
+parties hereto, such provision shall be reformed to the minimum extent
+necessary to make such provision valid and enforceable.
+
+If Recipient institutes patent litigation against any entity (including a
+cross-claim or counterclaim in a lawsuit) alleging that the Program itself
+(excluding combinations of the Program with other software or hardware)
+infringes such Recipient's patent(s), then such Recipient's rights granted
+under Section 2(b) shall terminate as of the date such litigation is filed.
+
+All Recipient's rights under this Agreement shall terminate if it fails to
+comply with any of the material terms or conditions of this Agreement and
+does not cure such failure in a reasonable period of time after becoming
+aware of such noncompliance. If all Recipient's rights under this Agreement
+terminate, Recipient agrees to cease use and distribution of the Program as
+soon as reasonably practicable. However, Recipient's obligations under this
+Agreement and any licenses granted by Recipient relating to the Program shall
+continue and survive.
+
+Everyone is permitted to copy and distribute copies of this Agreement, but in
+order to avoid inconsistency the Agreement is copyrighted and may only be
+modified in the following manner. The Agreement Steward reserves the right to
+publish new versions (including revisions) of this Agreement from time to
+time. No one other than the Agreement Steward has the right to modify this
+Agreement. The Eclipse Foundation is the initial Agreement Steward. The
+Eclipse Foundation may assign the responsibility to serve as the Agreement
+Steward to a suitable separate entity. Each new version of the Agreement will
+be given a distinguishing version number. The Program (including
+Contributions) may always be distributed subject to the version of the
+Agreement under which it was received. In addition, after a new version of
+the Agreement is published, Contributor may elect to distribute the Program
+(including its Contributions) under the new version. Except as expressly
+stated in Sections 2(a) and 2(b) above, Recipient receives no rights or
+licenses to the intellectual property of any Contributor under this
+Agreement, whether expressly, by implication, estoppel or otherwise. All
+rights in the Program not expressly granted under this Agreement are
+reserved.
+
+This Agreement is governed by the laws of the State of Washington and the
+intellectual property laws of the United States of America. No party to this
+Agreement will bring a legal action under this Agreement more than one year
+after the cause of action arose. Each party waives its rights to a jury trial
+in any resulting litigation.

README.md

@@ -0,0 +1,36 @@
+# milkwood-clj
+
+FIXME: description
+
+## Installation
+
+Download from http://example.com/FIXME.
+
+## Usage
+
+FIXME: explanation
+
+    $ java -jar milkwood-clj-0.1.0-standalone.jar [args]
+
+## Options
+
+FIXME: listing of options this app accepts.
+
+## Examples
+
+...
+
+### Bugs
+
+...
+
+### Any Other Sections
+### That You Think
+### Might be Useful
+
+## License
+
+Copyright © 2013 FIXME
+
+Distributed under the Eclipse Public License either version 1.0 or (at
+your option) any later version.

project.clj

@@ -0,0 +1,8 @@
+(defproject milkwood-clj "0.1.0-SNAPSHOT"
+  :description "FIXME: write description"
+  :url "http://example.com/FIXME"
+  :license {:name "Eclipse Public License"
+            :url "http://www.eclipse.org/legal/epl-v10.html"}
+  :dependencies [[org.clojure/clojure "1.5.1"]]
+  :main milkwood-clj.core
+  :profiles {:uberjar {:aot :all}})

src/milkwood_clj/core.clj

@@ -0,0 +1,121 @@
+(ns milkwood-clj.core
+  (require [clojure.set :as set])
+  (:gen-class))
+
+(defn -main
+  "I don't do a whole lot ... yet."
+  [& args]
+  (println "Hello, World!"))
+
+;;;; utilities - probably in the fullness of time a separate file
+
+;; 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
+(defn deep-merge-with
+  "Like merge-with, but merges maps recursively, applying the given fn
+  only when there's a non-map at a particular level.
+
+  (deep-merge-with + {:a {:b {:c 1 :d {:x 1 :y 2}} :e 3} :f 4}
+               {:a {:b {:c 2 :d {:z 9} :z 3} :e 100}})
+  -> {:a {:b {:z 3, :c 3, :d {:z 9, :x 1, :y 2}}, :e 103}, :f 4}"
+  [f & maps]
+  (apply
+    (fn m [& maps]
+      (if (every? map? maps)
+        (apply merge-with m maps)
+        (apply f maps)))
+    maps))
+
+;;;; read side - also probably a separate file
+
+(defn compose-rule
+  "Compose a new rule tree (containing (obviously) only one rule) from this path.
+
+   path: a flat sequence of tokens."
+  [path]
+  (cond
+   (empty? path) nil
+   true (hash-map (first path) (compose-rule (rest path)))))
+
+
+(defn merge-rules [these those]
+  (deep-merge-with set/union these those))
+
+(defn add-rule
+  "Add the rule defined by this path to these rules.
+
+   rules: a rule tree (i.e. a recursively nested map token => rule-tree);
+   path: a flat sequence of tokens."
+  [rules path]
+  (cond
+   ;; if we have no more path, we're done.
+   (empty? path) nil
+   ;; if we have no more rules, compose a rule from what's left of the path
+   (empty? rules) (compose-rule path)
+   ;; replace in the rules the rule for the first of the path, with this new
+   ;; rule generated from the rest of the path and the old rule for the first
+   ;; of the path.
+   true (merge-rules rules (add-rule (rules (first path)) (rest path)))))
+
+
+(defn read-rules
+  "Read this stream and process it into rules.
+
+  rules: a rule tree, which is to say a map which maps words onto rule trees (yes, it's recursive);
+  anger: a lookback window, holding the last n tokens read, where n = depth;
+  stream: an input stream from which we're reading;
+  line: the last line read from the stream if any;
+  depth: the depth of rules/length of window we're considering."
+  [rules anger stream line depth]
+  (cond
+     ;; if line and stream are empty, we're done; return the rules.
+        (empty? line) (cond (empty? stream) rules
+                                ;; if only the line is empty, get a new line from the stream and carry on.
+                                true (read-rules rules anger stream (read-line stream) depth))
+        true (let [token (first line) rage (slide-window anger token depth)]
+               ;; take the next token to consider off the front of the line and add it to the end of the
+               ;; sliding window
+               (cond
+                  ;; if the new sliding window is deep enough, add a rule and continue.
+                    (= (count rage) depth) (read-rules (add-rule rules rage) rage stream (rest line) depth)
+                  ;; else just continue without adding a rule.
+                    true (read-rules rules rage stream (rest line) depth))
+    )))
+
+;;;; 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.
+
+   rules: a rule tree (i.e. a recursively nested map token => rule-tree);
+   path: a flat sequence of tokens."
+  [rules path]
+  (cond
+   (empty? (rest path)) (shuffle (keys (rules (first path))))
+   (empty? (rules (first path))) nil
+   true (next-tokens (rules (first path)) (rest path))))
+
+(defn compose-nonsense
+  [window token depth length]
+  (cond
+   (= length 0) nil
+   )
+
+  )