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;; Copyright (c) Eduardo Julian. All rights reserved.
;; This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
;; If a copy of the MPL was not distributed with this file,
;; You can obtain one at http://mozilla.org/MPL/2.0/.
(ns lux.reader
(:require [clojure.string :as string]
clojure.core.match
clojure.core.match.array
[lux.base :as & :refer [deftags |do return* return fail fail* |let |case]]))
;; [Tags]
(deftags ""
"No"
"Done"
"Yes")
;; [Utils]
(defn ^:private with-line [body]
(fn [state]
(|case (&/get$ &/$source state)
(&/$Nil)
(fail* "[Reader Error] EOF")
(&/$Cons [[file-name line-num column-num] line]
more)
(|case (body file-name line-num column-num line)
($No msg)
(fail* msg)
($Done output)
(return* (&/set$ &/$source more state)
output)
($Yes output line*)
(return* (&/set$ &/$source (&/Cons$ line* more) state)
output))
)))
(defn ^:private with-lines [body]
(fn [state]
(|case (body (&/get$ &/$source state))
(&/$Right reader* match)
(return* (&/set$ &/$source reader* state)
match)
(&/$Left msg)
(fail* msg)
)))
;; [Exports]
(defn ^:private re-find! [^java.util.regex.Pattern regex column ^String line]
(let [matcher (doto (.matcher regex line)
(.region column (.length line))
(.useAnchoringBounds true))]
(when (.find matcher)
(.group matcher 0))))
(defn ^:private re-find1! [^java.util.regex.Pattern regex column ^String line]
(let [matcher (doto (.matcher regex line)
(.region column (.length line))
(.useAnchoringBounds true))]
(when (.find matcher)
(.group matcher 1))))
(defn ^:private re-find3! [^java.util.regex.Pattern regex column ^String line]
(let [matcher (doto (.matcher regex line)
(.region column (.length line))
(.useAnchoringBounds true))]
(when (.find matcher)
(list (.group matcher 0)
(.group matcher 1)
(.group matcher 2)))))
(defn read-regex [regex]
(with-line
(fn [file-name line-num column-num ^String line]
;; (prn 'read-regex [file-name line-num column-num regex line])
(if-let [^String match (do ;; (prn '[regex line] [regex line])
(re-find! regex column-num line))]
(let [;; _ (prn 'match match)
match-length (.length match)
column-num* (+ column-num match-length)]
(if (= column-num* (.length line))
(&/V $Done (&/T (&/T file-name line-num column-num) match))
(&/V $Yes (&/T (&/T (&/T file-name line-num column-num) match)
(&/T (&/T file-name line-num column-num*) line)))))
(&/V $No (str "[Reader Error] Pattern failed: " regex))))))
(defn read-regex2 [regex]
(with-line
(fn [file-name line-num column-num ^String line]
;; (prn 'read-regex2 [file-name line-num column-num regex line])
(if-let [[^String match tok1 tok2] (re-find3! regex column-num line)]
(let [match-length (.length match)
column-num* (+ column-num match-length)]
(if (= column-num* (.length line))
(&/V $Done (&/T (&/T file-name line-num column-num) (&/T tok1 tok2)))
(&/V $Yes (&/T (&/T (&/T file-name line-num column-num) (&/T tok1 tok2))
(&/T (&/T file-name line-num column-num*) line)))))
(&/V $No (str "[Reader Error] Pattern failed: " regex))))))
(defn read-regex+ [regex]
(with-lines
(fn [reader]
(loop [prefix ""
reader* reader]
(|case reader*
(&/$Nil)
(&/V &/$Left "[Reader Error] EOF")
(&/$Cons [[file-name line-num column-num] ^String line]
reader**)
(if-let [^String match (do ;; (prn 'read-regex+ regex line)
(re-find1! regex column-num line))]
(let [match-length (.length match)
column-num* (+ column-num match-length)]
(if (= column-num* (.length line))
(recur (str prefix match "\n") reader**)
(&/V &/$Right (&/T (&/Cons$ (&/T (&/T file-name line-num column-num*) line)
reader**)
(&/T (&/T file-name line-num column-num) (str prefix match))))))
(&/V &/$Left (str "[Reader Error] Pattern failed: " regex))))))))
(defn read-text [^String text]
(with-line
(fn [file-name line-num column-num ^String line]
;; (prn 'read-text [file-name line-num column-num text line])
(if (.startsWith line text column-num)
(let [match-length (.length text)
column-num* (+ column-num match-length)]
(if (= column-num* (.length line))
(&/V $Done (&/T (&/T file-name line-num column-num) text))
(&/V $Yes (&/T (&/T (&/T file-name line-num column-num) text)
(&/T (&/T file-name line-num column-num*) line)))))
(&/V $No (str "[Reader Error] Text failed: " text))))))
(def ^:private ^String +source-dir+ "input/")
(defn from [^String file-name ^String file-content]
(let [lines (&/->list (string/split-lines file-content))
file-name (.substring file-name (.length +source-dir+))]
(&/|map (fn [line+line-num]
(|let [[line-num line] line+line-num]
(&/T (&/T file-name (inc line-num) 0)
line)))
(&/|filter (fn [line+line-num]
(|let [[line-num line] line+line-num]
(not= "" line)))
(&/enumerate lines)))))
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