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# mw-parser
A rule parser for MicroWorld
## Usage
FIXME
## License
Copyright © 2014 Simon Brooke
Distributed under the GNU General Public License either version 2.0 or (at
your option) any later version.

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# Introduction to mw-parser
TODO: write [great documentation](http://jacobian.org/writing/great-documentation/what-to-write/)

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(defproject mw-parser "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"}
:plugins [[lein-marginalia "0.7.1"]]
:dependencies [[org.clojure/clojure "1.5.1"]
[mw-engine "0.1.0-SNAPSHOT"]
])

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;; A very simple parser which parses production rules of the following forms:
;;
;; "if altitude is less than 100 and state is forest then state should be climax and deer should be 3"
;; "if altitude is 100 and fertility is 25 then state should be heath"
;; "if altitude is 100 or fertility is 25 then state should be heath"
;;
;; it generates rules in the form expected by mw-engine.core
(ns mw-parser.core
(:use mw-engine.utils
[clojure.string :only [split triml]]))
(declare parse-conditions)
(declare parse-not-condition)
(declare parse-simple-condition)
(defn parse-less-condition [[property is less than value & rest]]
(cond (and (= is "is") (= less "less") (= than "than"))
[(list '< (list 'get-int 'cell (keyword property)) value)
rest]))
(defn parse-more-condition [[property is more than value & rest]]
(cond (and (= is "is") (= more "more") (= than "than"))
[(list '> (list 'get-int 'cell (keyword property)) value)
:remainder rest]))
(defn parse-is-condition
"Parse clauses of the form 'x is y', but not 'x is more than y' or 'x is less than y'.
It is necessary to disambiguate whether value is a numeric or keyword."
[[property is value & rest]]
(cond (and (= is "is")
(not (member? value '("more" "less" "exactly" "not"))))
[(cond
(re-matches #"^[0-9]*$" value)(list '= (list 'get-int 'cell (keyword property)) (. Integer parseInt value))
true (list '= (list (keyword property) 'cell) (keyword value)))
rest]))
(defn parse-not-condition [[property is not & rest]]
(cond (and (= is "is") (= not "not"))
(let [partial (parse-simple-condition (cons property (cons is rest)))]
(cond partial
(let [[condition remainder] partial]
[(list 'not condition) remainder])))))
(defn parse-simple-condition
"Parse conditions of the form '[property] [comparison] [value]'."
[tokens]
(or (parse-is-condition tokens)
(parse-not-condition tokens)
(parse-exactly-condition tokens)
(parse-less-condition tokens)
(parse-more-condition tokens)))
(defn parse-disjunction-condition
"Parse '... or [condition]' from `tokens`, there `left` is the already parsed first disjunct."
[left tokens]
(let [partial (parse-conditions tokens)]
(if
partial
(let [[right remainder] partial]
[(list 'or left right) remainder]))))
(defn parse-conjunction-condition
"Parse '... and [condition]' from `tokens`, there `left` is the already parsed first conjunct."
[left tokens]
(let [partial (parse-conditions tokens)]
(if partial
(let [[right remainder] partial]
[(list 'and left right) remainder]
))))
(defn parse-conditions
"Parse conditions from `tokens`, where conditions may be linked by either 'and' or 'or'."
[tokens]
(let [partial (parse-simple-condition tokens)]
(if partial
(let [[left [next & remainder]] partial]
(cond
(= next "and") (parse-conjunction-condition left remainder)
(= next "or") (parse-disjunction-condition left remainder)
true partial)
))))
(defn parse-left-hand-side
"Parse the left hand side ('if...') of a production rule."
[tokens]
(if
(= (first tokens) "if")
(parse-conditions (rest tokens))))
(defn parse-simple-action [previous [property should be value & rest]]
(if (and (= should "should") (= be "be"))
[(list 'merge (or previous 'cell)
{(keyword property) (cond (re-matches #"^[0-9]*$" value) (. Integer parseInt value) true (keyword value))}) rest])
)
(defn parse-actions
"Parse actions from tokens."
[previous tokens]
(let [[left remainder] (parse-simple-action previous tokens)]
(cond left
(cond (= (first remainder) "and")
(parse-actions left (rest remainder))
true (list left)))))
(defn parse-right-hand-side
"Parse the right hand side ('then...') of a production rule."
[tokens]
(if (= (first tokens) "then")
(parse-actions nil (rest tokens))))
(defn parse-rule [line]
(cond
(string? line) (parse-rule (split (triml line) #"\s+"))
true (let [[left remainder] (parse-left-hand-side line)
[right junk] (parse-right-hand-side remainder)]
;; there shouldn't be any junk (should be null)
(list 'fn ['cell 'world] (list 'if left right))
)))

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(ns mw-parser.core-test
(:require [clojure.test :refer :all]
[mw-parser.core :refer :all]))
(deftest a-test
(testing "FIXME, I fail."
(is (= 0 1))))