261 lines
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261 lines
16 KiB
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<link rel="stylesheet" href="../coverage.css"/> <title> mw_parser/simplify.clj </title>
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001 (ns ^{:doc "Simplify a parse tree."
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002 :author "Simon Brooke"}
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003 mw-parser.simplify)
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004
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005 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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006 ;;;;
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007 ;;;; mw-parser: a rule parser for MicroWorld.
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008 ;;;;
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<span class="not-tracked" title="0 out of 0 forms covered">
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009 ;;;; This program is free software; you can redistribute it and/or
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<span class="not-tracked" title="0 out of 0 forms covered">
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010 ;;;; modify it under the terms of the GNU General Public License
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<span class="not-tracked" title="0 out of 0 forms covered">
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011 ;;;; as published by the Free Software Foundation; either version 2
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<span class="not-tracked" title="0 out of 0 forms covered">
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012 ;;;; of the License, or (at your option) any later version.
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013 ;;;;
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014 ;;;; This program is distributed in the hope that it will be useful,
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015 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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016 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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<span class="not-tracked" title="0 out of 0 forms covered">
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017 ;;;; GNU General Public License for more details.
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018 ;;;;
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019 ;;;; You should have received a copy of the GNU General Public License
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<span class="not-tracked" title="0 out of 0 forms covered">
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020 ;;;; along with this program; if not, write to the Free Software
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<span class="not-tracked" title="0 out of 0 forms covered">
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021 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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022 ;;;; USA.
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023 ;;;;
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024 ;;;; Copyright (C) 2014 Simon Brooke
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025 ;;;;
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026 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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027
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028 (declare simplify-flow simplify-rule)
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029
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030 ;; (defn simplify-qualifier
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031 ;; "Given that this `tree` fragment represents a qualifier, what
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<span class="not-tracked" title="0 out of 0 forms covered">
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032 ;; qualifier is that?"
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033 ;; [tree]
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034 ;; (cond
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035 ;; (empty? tree) nil
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036 ;; (and (coll? tree)
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037 ;; (#{:EQUIVALENCE :COMPARATIVE} (first tree))) tree
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038 ;; (coll? (first tree)) (or (simplify-qualifier (first tree))
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039 ;; (simplify-qualifier (rest tree)))
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040 ;; (coll? tree) (simplify-qualifier (rest tree))
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041 ;; :else tree))
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042
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043 (defn simplify-second-of-two
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044 "There are a number of possible simplifications such that if the `tree` has
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045 only two elements, the second is semantically sufficient."
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046 [tree]
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047 (if (= (count tree) 2) (simplify-rule (nth tree 1)) tree))
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048
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049 ;; (defn simplify-quantifier
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050 ;; "If this quantifier is a number, 'simplifiy' it into a comparative whose operator is '='
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051 ;; and whose quantity is that number. This is actually more complicated but makes generation easier."
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052 ;; [tree]
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053 ;; (if (number? (second tree)) [:COMPARATIVE '= (second tree)] (simplify-rule (second tree))))
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054
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055 (defn simplify-rule
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056 "Simplify/canonicalise this `tree`. Opportunistically replace complex fragments with
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057 semantically identical simpler fragments"
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058 [tree]
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059 (if
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060 (coll? tree)
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061 (case (first tree)
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062 :ACTION (simplify-second-of-two tree)
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063 :ACTIONS (cons (first tree) (simplify-rule (rest tree)))
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064 :CHANCE-IN nil
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065 :COMPARATIVE (simplify-second-of-two tree)
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066 :CONDITION (simplify-second-of-two tree)
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067 :CONDITIONS (simplify-second-of-two tree)
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068 :EXPRESSION (simplify-second-of-two tree)
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069 :PROPERTY (simplify-second-of-two tree)
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070 :PROPERTY-CONDITION-OR-EXPRESSION (simplify-second-of-two tree)
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071 :SPACE nil
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072 :THEN nil
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073 :AND nil
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074 :VALUE (simplify-second-of-two tree)
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075 (remove nil? (map simplify-rule tree)))
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076 tree))
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077
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078 (defn simplify-determiner-condition
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079 [tree]
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080 (apply vector
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081 (cons :DETERMINER-CONDITION
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082 (cons
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083 (simplify-second-of-two (second tree))
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084 (rest (rest tree))))))
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