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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/.
(;import lux
(lux (meta macro
ast)
(control (monoid #as m)
(eq #as E)
(ord #as O)
(show #as S)
(monad #as M #refer #all))
(data (number (int #open ("i" Int/Number Int/Ord)))
maybe
(list #refer (#only foldL list list&)))))
## [Functions]
(def #export (size x)
(-> Text Int)
(_jvm_i2l (_jvm_invokevirtual "java.lang.String" "length" []
x [])))
(def #export (@ idx x)
(-> Int Text (Maybe Char))
(if (and (i< idx (size x))
(i>= idx 0))
(#;Some (_jvm_invokevirtual "java.lang.String" "charAt" ["int"]
x [(_jvm_l2i idx)]))
#;None))
(def #export (contains? x y)
(-> Text Text Bool)
(_jvm_invokevirtual "java.lang.String" "contains" ["java.lang.CharSequence"]
x [y]))
(do-template [<name> <method>]
[(def #export (<name> x)
(-> Text Text)
(_jvm_invokevirtual "java.lang.String" <method> []
x []))]
[lower-case "toLowerCase"]
[upper-case "toUpperCase"]
[trim "trim"]
)
(def #export (sub' from to x)
(-> Int Int Text (Maybe Text))
(if (and (i< from to)
(i>= from 0)
(i<= to (size x)))
(#;Some (_jvm_invokevirtual "java.lang.String" "substring" ["int" "int"]
x [(_jvm_l2i from) (_jvm_l2i to)]))
#;None))
(def #export (sub from x)
(-> Int Text (Maybe Text))
(sub' from (size x) x))
(def #export (split at x)
(-> Int Text (Maybe (, Text Text)))
(if (and (i< at (size x))
(i>= at 0))
(let [pre (_jvm_invokevirtual "java.lang.String" "substring" ["int" "int"]
x [(_jvm_l2i 0) (_jvm_l2i at)])
post (_jvm_invokevirtual "java.lang.String" "substring" ["int"]
x [(_jvm_l2i at)])]
(#;Some [pre post]))
#;None))
(def #export (replace pattern value template)
(-> Text Text Text Text)
(_jvm_invokevirtual "java.lang.String" "replace" ["java.lang.CharSequence" "java.lang.CharSequence"]
template [pattern value]))
(do-template [<common> <general> <method>]
[(def #export (<general> pattern from x)
(-> Text Int Text (Maybe Int))
(if (and (i< from (size x)) (i>= from 0))
(case (_jvm_i2l (_jvm_invokevirtual "java.lang.String" <method> ["java.lang.String" "int"]
x [pattern (_jvm_l2i from)]))
-1 #;None
idx (#;Some idx))
#;None))
(def #export (<common> pattern x)
(-> Text Text (Maybe Int))
(case (_jvm_i2l (_jvm_invokevirtual "java.lang.String" <method> ["java.lang.String"]
x [pattern]))
-1 #;None
idx (#;Some idx)))]
[index-of index-of' "indexOf"]
[last-index-of last-index-of' "lastIndexOf"]
)
(def #export (starts-with? prefix x)
(-> Text Text Bool)
(case (index-of prefix x)
(#;Some 0)
true
_
false))
(def #export (ends-with? postfix x)
(-> Text Text Bool)
(case (last-index-of postfix x)
(#;Some n)
(i= (i+ n (size postfix))
(size x))
_
false))
## [Structures]
(defstruct #export Text/Eq (E;Eq Text)
(def (= x y)
(_jvm_invokevirtual "java.lang.Object" "equals" ["java.lang.Object"]
x [y])))
(defstruct #export Text/Ord (O;Ord Text)
(def _eq Text/Eq)
(do-template [<name> <op>]
[(def (<name> x y)
(<op> (_jvm_i2l (_jvm_invokevirtual "java.lang.String" "compareTo" ["java.lang.String"]
x [y]))
0))]
[< i<]
[<= i<=]
[> i>]
[>= i>=]))
(defstruct #export Text/Show (S;Show Text)
(def show id))
(defstruct #export Text/Monoid (m;Monoid Text)
(def unit "")
(def (++ x y)
(_jvm_invokevirtual "java.lang.String" "concat" ["java.lang.String"]
x [y])))
## [Syntax]
(def (extract-var template)
(-> Text (Maybe (, Text Text Text)))
(do Maybe/Monad
[pre-idx (index-of "#{" template)
[pre in] (split pre-idx template)
[_ in] (split 2 in)
post-idx (index-of "}" in)
[var post] (split post-idx in)
[_ post] (split 1 post)]
(wrap [pre var post])))
(def (unravel-template template)
(-> Text (List AST))
(case (extract-var template)
(#;Some [pre var post])
(list& (text$ pre) (symbol$ ["" var])
(unravel-template post))
#;None
(list (text$ template))))
(defmacro #export (<> tokens state)
(case tokens
(\ (list [_ (#;TextS template)]))
(let [++ (symbol$ ["" ""])]
(#;Right state (list (` (;let [(~ ++) (;:: Text/Monoid m;++)]
(;$ (~ ++) (~@ (unravel-template template))))))))
_
(#;Left "Wrong syntax for <>")))
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