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html.cljs
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html.cljs
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(ns parser-combinators.examples.html
(:require [clojure.string :as string]
[parser-combinators.core :as pc]
[parser-combinators.characters :as characters]))
(defn- call-value-with [value handler] (handler value))
(defn- helper-value-interleave [result value index]
(if (> (count value) 0)
(recur (if (even? index) (conj result (first value)) result) (rest value) (inc index))
result))
(def parse-digit (pc/generate-char-match (re-pattern "[0-9]")))
(def parse-hyphen (pc/generate-char characters/hyphen))
(def parse-letter (pc/generate-char-match (re-pattern "[a-z]")))
(def parse-attr
(pc/transform-value
(pc/combine-chain
parse-letter
(pc/transform-value
(pc/combine-asterisk (pc/combine-or parse-letter parse-digit parse-hyphen))
(fn [value] (string/join "" value))))
(fn [value] (string/join "" value))))
(def parse-equal (pc/generate-char characters/equal))
(def parse-entry (pc/combine-chain parse-attr parse-equal pc/parse-string))
(def parse-seperation
(pc/transform-value (pc/combine-some pc/parse-whitespace) (fn [value] nil)))
(def parse-attributes
(pc/transform-value
(pc/combine-interleave parse-entry parse-seperation)
(fn [value] (helper-value-interleave [] value 0))))
(def parse-gt (pc/generate-char characters/gt))
(def parse-lt (pc/generate-char characters/lt))
(def parse-slash (pc/generate-char characters/slash))
(def parse-tag-name
(pc/transform-value
(pc/combine-chain
parse-letter
(pc/transform-value
(pc/combine-asterisk (pc/combine-or parse-letter parse-digit parse-hyphen))
(fn [value] (string/join "" value))))
(fn [value] (string/join "" value))))
(def parse-close-tag
(pc/transform-value
(pc/combine-chain
parse-lt
parse-slash
(pc/combine-optional parse-seperation)
parse-tag-name
parse-gt)
(fn [value] (get value 3))))
(def parse-open-tag
(pc/transform-value
(pc/combine-chain
parse-lt
parse-tag-name
(pc/combine-optional parse-seperation)
(pc/combine-optional parse-attributes)
parse-gt)
(fn [value] [(get value 1) (or (get value 3) [])])))
(def parse-normal-tag (pc/combine-chain parse-open-tag parse-close-tag))
(defn parse-not-tag [state]
(if (= (:code state) "")
(assoc state :failed true :msg "error eof")
(pc/call-value-with state (pc/combine-opposite parse-lt))))
(def parse-self-close-tag
(pc/transform-value
(pc/combine-chain
parse-lt
parse-tag-name
(pc/combine-optional parse-seperation)
(pc/combine-optional parse-attributes)
parse-slash
parse-gt)
(fn [value] [(get value 1) (or (get value 3) [])])))
(def parse-tag (pc/combine-or parse-self-close-tag parse-normal-tag))
(def parse-text
(pc/transform-value (pc/combine-some parse-not-tag) (fn [value] (string/join "" value))))
(def parse-html (pc/combine-some (pc/combine-or parse-text parse-tag)))