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Changed license to GPL; some minor documentation changes.

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Simon Brooke 2014-07-13 14:08:13 +01:00
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@ -1,214 +1,258 @@
THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC # GNU GENERAL PUBLIC LICENSE
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6
README.md
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@ -123,5 +123,7 @@ and 'some neighbours...' is equivalent to 'more than 0 neighbours...'
Copyright © 2014 Simon Brooke Copyright © 2014 Simon Brooke
Distributed under the GNU General Public License either version 2.0 or (at Distributed under the terms of the [GNU General Public License v2][1]
your option) any later version.
[1]: http://www.gnu.org/licenses/gpl-2.0.html

4
project.clj
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@ -1,8 +1,8 @@
(defproject mw-parser "0.1.0-SNAPSHOT" (defproject mw-parser "0.1.0-SNAPSHOT"
:description "Parser for production rules for MicroWorld engine" :description "Parser for production rules for MicroWorld engine"
:url "http://example.com/FIXME" :url "http://example.com/FIXME"
:license {:name "Eclipse Public License" :license {:name "GNU General Public License v2"
:url "http://www.eclipse.org/legal/epl-v10.html"} :url "http://www.gnu.org/licenses/gpl-2.0.html"}
:plugins [[lein-marginalia "0.7.1"]] :plugins [[lein-marginalia "0.7.1"]]
:dependencies [[org.clojure/clojure "1.5.1"] :dependencies [[org.clojure/clojure "1.5.1"]
[mw-engine "0.1.0-SNAPSHOT"] [mw-engine "0.1.0-SNAPSHOT"]

65
src/mw_parser/core.clj
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@ -25,7 +25,7 @@
(ns mw-parser.core (ns mw-parser.core
(:use mw-engine.utils (:use mw-engine.utils
[clojure.string :only [split triml]])) [clojure.string :only [split trim triml]]))
(declare parse-conditions) (declare parse-conditions)
(declare parse-not-condition) (declare parse-not-condition)
@ -34,7 +34,7 @@
;; a regular expression which matches string representation of numbers ;; a regular expression which matches string representation of numbers
(def re-number #"^[0-9.]*$") (def re-number #"^[0-9.]*$")
(defn keyword-or-numeric (defn- keyword-or-numeric
"If this token appears to represent an explicit number, return that number; "If this token appears to represent an explicit number, return that number;
otherwise, make a keyword of it and return that." otherwise, make a keyword of it and return that."
[token] [token]
@ -53,23 +53,23 @@
;; In every case if the function cannot parse the desired construct from the ;; In every case if the function cannot parse the desired construct from the
;; front of the sequence of tokens it returns nil. ;; front of the sequence of tokens it returns nil.
(defn parse-numeric-value (defn- parse-numeric-value
"Parse a number." "Parse a number."
[[value & remainder]] [[value & remainder]]
(if (re-matches re-number value) [(read-string value) remainder])) (if (re-matches re-number value) [(read-string value) remainder]))
(defn parse-property-int (defn- parse-property-int
"Parse a token assumed to be the name of a property of the current cell, "Parse a token assumed to be the name of a property of the current cell,
whose value is assumed to be an integer." whose value is assumed to be an integer."
[[value & remainder]] [[value & remainder]]
(if value [(list 'get-int 'cell (keyword value)) remainder])) (if value [(list 'get-int 'cell (keyword value)) remainder]))
(defn parse-property-value (defn- parse-property-value
"Parse a token assumed to be the name of a property of the current cell." "Parse a token assumed to be the name of a property of the current cell."
[[value & remainder]] [[value & remainder]]
(if value [(list (keyword value) 'cell) remainder])) (if value [(list (keyword value) 'cell) remainder]))
(defn parse-simple-value (defn- parse-simple-value
"Parse a value from the first of these `tokens`. If `expect-int` is true, return "Parse a value from the first of these `tokens`. If `expect-int` is true, return
an integer or something which will evaluate to an integer." an integer or something which will evaluate to an integer."
([tokens expect-int] ([tokens expect-int]
@ -81,7 +81,7 @@
([tokens] ([tokens]
(parse-simple-value tokens false))) (parse-simple-value tokens false)))
(defn parse-disjunct-value (defn- parse-disjunct-value
"Parse a list of values from among these `tokens`. If `expect-int` is true, return "Parse a list of values from among these `tokens`. If `expect-int` is true, return
an integer or something which will evaluate to an integer." an integer or something which will evaluate to an integer."
[[OR token & tokens] expect-int] [[OR token & tokens] expect-int]
@ -95,7 +95,7 @@
remainder]) remainder])
true [nil (cons OR (cons token tokens))])) true [nil (cons OR (cons token tokens))]))
(defn parse-value (defn- parse-value
"Parse a value from among these `tokens`. If `expect-int` is true, return "Parse a value from among these `tokens`. If `expect-int` is true, return
an integer or something which will evaluate to an integer." an integer or something which will evaluate to an integer."
([tokens expect-int] ([tokens expect-int]
@ -105,25 +105,26 @@
([tokens] ([tokens]
(parse-value tokens false))) (parse-value tokens false)))
(defn parse-member-condition (defn- parse-member-condition
"Parses a condition of the form '[property] in [value] or [value]...'"
[[property IN & rest]] [[property IN & rest]]
(if (= IN "in") (if (= IN "in")
(let [[l remainder] (parse-disjunct-value (cons "in" rest) false)] (let [[l remainder] (parse-disjunct-value (cons "in" rest) false)]
[(list 'member? (keyword property) l) remainder]))) [(list 'member? (keyword property) l) remainder])))
(defn parse-less-condition (defn- parse-less-condition
"Parse '[property] less than [value]'." "Parse '[property] less than [value]'."
[[property LESS THAN value & rest]] [[property LESS THAN value & rest]]
(cond (and (= LESS "less") (= THAN "than")) (cond (and (= LESS "less") (= THAN "than"))
[(list '< (list 'get-int 'cell (keyword property)) (read-string value)) rest])) [(list '< (list 'get-int 'cell (keyword property)) (read-string value)) rest]))
(defn parse-more-condition (defn- parse-more-condition
"Parse '[property] more than [value]'." "Parse '[property] more than [value]'."
[[property MORE THAN value & rest]] [[property MORE THAN value & rest]]
(cond (and (= MORE "more") (= THAN "than")) (cond (and (= MORE "more") (= THAN "than"))
[(list '> (list 'get-int 'cell (keyword property)) (read-string value)) rest])) [(list '> (list 'get-int 'cell (keyword property)) (read-string value)) rest]))
(defn parse-between-condition (defn- parse-between-condition
[[p BETWEEN v1 AND v2 & rest]] [[p BETWEEN v1 AND v2 & rest]]
(cond (and (= BETWEEN "between") (= AND "and") (not (nil? v2))) (cond (and (= BETWEEN "between") (= AND "and") (not (nil? v2)))
(let [property (first (parse-simple-value (list p) true)) (let [property (first (parse-simple-value (list p) true))
@ -133,7 +134,7 @@
(list '< value1 property value2) (list '< value1 property value2)
(list '> value1 property value2)) rest]))) (list '> value1 property value2)) rest])))
(defn parse-is-condition (defn- parse-is-condition
"Parse clauses of the form 'x is y', 'x is in y or z...', "Parse clauses of the form 'x is y', 'x is in y or z...',
'x is between y and z', 'x is more than y' or 'x is less than y'. 'x is between y and z', 'x is more than y' or 'x is less than y'.
It is necessary to disambiguate whether value is a numeric or keyword." It is necessary to disambiguate whether value is a numeric or keyword."
@ -149,7 +150,7 @@
(re-matches re-number value) [(list '= (list 'get-int 'cell (keyword property)) (read-string value)) rest] (re-matches re-number value) [(list '= (list 'get-int 'cell (keyword property)) (read-string value)) rest]
value [(list '= (list (keyword property) 'cell) (keyword value)) rest])))) value [(list '= (list (keyword property) 'cell) (keyword value)) rest]))))
(defn parse-not-condition (defn- parse-not-condition
"Parse the negation of a simple condition." "Parse the negation of a simple condition."
[[property IS NOT & rest]] [[property IS NOT & rest]]
(cond (and (member? IS '("is" "are")) (= NOT "not")) (cond (and (member? IS '("is" "are")) (= NOT "not"))
@ -167,7 +168,7 @@
quantity) quantity)
remainder]) remainder])
(defn parse-comparator-neighbours-condition (defn- parse-comparator-neighbours-condition
"Parse conditions of the form '...more than 6 neighbours are [condition]'" "Parse conditions of the form '...more than 6 neighbours are [condition]'"
[[MORE THAN n NEIGHBOURS have-or-are & rest]] [[MORE THAN n NEIGHBOURS have-or-are & rest]]
(let [quantity (first (parse-numeric-value (list n))) (let [quantity (first (parse-numeric-value (list n)))
@ -192,13 +193,13 @@
;; (gen-neighbours-condition '< quantity property value remainder) ;; (gen-neighbours-condition '< quantity property value remainder)
)))))) ))))))
(defn parse-some-neighbours-condition (defn- parse-some-neighbours-condition
[[SOME NEIGHBOURS & rest]] [[SOME NEIGHBOURS & rest]]
(cond (cond
(and (= SOME "some") (= NEIGHBOURS "neighbours")) (and (= SOME "some") (= NEIGHBOURS "neighbours"))
(parse-comparator-neighbours-condition (concat '("more" "than" "0" "neighbours") rest)))) (parse-comparator-neighbours-condition (concat '("more" "than" "0" "neighbours") rest))))
(defn parse-simple-neighbours-condition (defn- parse-simple-neighbours-condition
"Parse conditions of the form '...6 neighbours are condition'" "Parse conditions of the form '...6 neighbours are condition'"
[[n NEIGHBOURS have-or-are & rest]] [[n NEIGHBOURS have-or-are & rest]]
(let [quantity (first (parse-numeric-value (list n)))] (let [quantity (first (parse-numeric-value (list n)))]
@ -218,7 +219,7 @@
;; (gen-neighbours-condition '< quantity property value remainder) ;; (gen-neighbours-condition '< quantity property value remainder)
)))))) ))))))
(defn parse-neighbours-condition (defn- parse-neighbours-condition
"Parse conditions referring to neighbours" "Parse conditions referring to neighbours"
[tokens] [tokens]
(or (or
@ -227,7 +228,7 @@
(parse-some-neighbours-condition tokens) (parse-some-neighbours-condition tokens)
)) ))
(defn parse-simple-condition (defn- parse-simple-condition
"Parse conditions of the form '[property] [comparison] [value]'." "Parse conditions of the form '[property] [comparison] [value]'."
[tokens] [tokens]
(or (or
@ -238,7 +239,7 @@
(parse-less-condition tokens) (parse-less-condition tokens)
(parse-more-condition tokens))) (parse-more-condition tokens)))
(defn parse-disjunction-condition (defn- parse-disjunction-condition
"Parse '... or [condition]' from `tokens`, where `left` is the already parsed first disjunct." "Parse '... or [condition]' from `tokens`, where `left` is the already parsed first disjunct."
[left tokens] [left tokens]
(let [partial (parse-conditions tokens)] (let [partial (parse-conditions tokens)]
@ -246,7 +247,7 @@
(let [[right remainder] partial] (let [[right remainder] partial]
[(list 'or left right) remainder])))) [(list 'or left right) remainder]))))
(defn parse-conjunction-condition (defn- parse-conjunction-condition
"Parse '... and [condition]' from `tokens`, where `left` is the already parsed first conjunct." "Parse '... and [condition]' from `tokens`, where `left` is the already parsed first conjunct."
[left tokens] [left tokens]
(let [partial (parse-conditions tokens)] (let [partial (parse-conditions tokens)]
@ -254,7 +255,7 @@
(let [[right remainder] partial] (let [[right remainder] partial]
[(list 'and left right) remainder])))) [(list 'and left right) remainder]))))
(defn parse-conditions (defn- parse-conditions
"Parse conditions from `tokens`, where conditions may be linked by either 'and' or 'or'." "Parse conditions from `tokens`, where conditions may be linked by either 'and' or 'or'."
[tokens] [tokens]
(let [partial (parse-simple-condition tokens)] (let [partial (parse-simple-condition tokens)]
@ -265,14 +266,14 @@
(= next "or") (parse-disjunction-condition left remainder) (= next "or") (parse-disjunction-condition left remainder)
true partial))))) true partial)))))
(defn parse-left-hand-side (defn- parse-left-hand-side
"Parse the left hand side ('if...') of a production rule." "Parse the left hand side ('if...') of a production rule."
[tokens] [[IF & tokens]]
(if (if
(= (first tokens) "if") (= IF "if")
(parse-conditions (rest tokens)))) (parse-conditions tokens)))
(defn parse-arithmetic-action (defn- parse-arithmetic-action
"Parse actions of the form '[property] should be [property] [arithmetic-operator] [value]', "Parse actions of the form '[property] should be [property] [arithmetic-operator] [value]',
e.g. 'fertility should be fertility + 1', or 'deer should be deer - wolves'." e.g. 'fertility should be fertility + 1', or 'deer should be deer - wolves'."
[previous [prop1 should be prop2 operator value & rest]] [previous [prop1 should be prop2 operator value & rest]]
@ -285,18 +286,18 @@
(re-matches re-number value) (read-string value) (re-matches re-number value) (read-string value)
true (list 'get-int 'cell (keyword value))))}) rest])) true (list 'get-int 'cell (keyword value))))}) rest]))
(defn parse-set-action (defn- parse-set-action
"Parse actions of the form '[property] should be [value].'" "Parse actions of the form '[property] should be [value].'"
[previous [property should be value & rest]] [previous [property should be value & rest]]
(if (and (= should "should") (= be "be")) (if (and (= should "should") (= be "be"))
[(list 'merge (or previous 'cell) [(list 'merge (or previous 'cell)
{(keyword property) (cond (re-matches re-number value) (read-string value) true (keyword value))}) rest])) {(keyword property) (cond (re-matches re-number value) (read-string value) true (keyword value))}) rest]))
(defn parse-simple-action [previous tokens] (defn- parse-simple-action [previous tokens]
(or (parse-arithmetic-action previous tokens) (or (parse-arithmetic-action previous tokens)
(parse-set-action previous tokens))) (parse-set-action previous tokens)))
(defn parse-actions (defn- parse-actions
"Parse actions from tokens." "Parse actions from tokens."
[previous tokens] [previous tokens]
(let [[left remainder] (parse-simple-action previous tokens)] (let [[left remainder] (parse-simple-action previous tokens)]
@ -305,7 +306,7 @@
(parse-actions left (rest remainder)) (parse-actions left (rest remainder))
true (list left))))) true (list left)))))
(defn parse-probability (defn- parse-probability
"Parse a probability of an action from this collection of tokens" "Parse a probability of an action from this collection of tokens"
[previous [n CHANCE IN m & tokens]] [previous [n CHANCE IN m & tokens]]
(cond (cond
@ -319,7 +320,7 @@
(first (parse-simple-value (list n) true))) (first (parse-simple-value (list n) true)))
action) remainder])))) action) remainder]))))
(defn parse-right-hand-side (defn- parse-right-hand-side
"Parse the right hand side ('then...') of a production rule." "Parse the right hand side ('then...') of a production rule."
[[THEN & tokens]] [[THEN & tokens]]
(if (= THEN "then") (if (= THEN "then")