/*---------------------------------------------------------------------------
  Copyright 2012-2024, Microsoft Research, Daan Leijen.

  This is free software; you can redistribute it and/or modify it under the
  terms of the Apache License, Version 2.0. A copy of the License can be
  found in the LICENSE file at the root of this distribution.
---------------------------------------------------------------------------*/

/* Core functions.

   This module is implicitly imported and all functions and types
   are always available.
   Some types and operations are required to be defined for the compiler
   to work correctly (i.e. types like `:exn` or `:list`)
*/
module std/corestd/core

pub import std/core/typesstd/core/types
import std/core/undivstd/core/undiv
import std/core/unsafestd/core/unsafe
pub import std/core/hndstd/core/hnd
pub import std/core/exnstd/core/exn
pub import std/core/boolstd/core/bool
pub import std/core/orderstd/core/order
pub import std/core/charstd/core/char
pub import std/core/intstd/core/int
pub import std/core/vectorstd/core/vector
pub import std/core/stringstd/core/string
pub import std/core/sslicestd/core/sslice
pub import std/core/liststd/core/list
pub import std/core/maybestd/core/maybe
pub import std/core/maybe2std/core/maybe2
pub import std/core/eitherstd/core/either
pub import std/core/tuplestd/core/tuple
pub import std/core/lazystd/core/lazy
pub import std/core/showstd/core/show
pub import std/core/debugstd/core/debug
pub import std/core/delayedstd/core/delayed
pub import std/core/consolestd/core/console

extern import
  c  file "core/inline/core"
  cs file "core/inline/core.cs"

// ----------------------------------------------------------------------------
// Builtin effects
// ----------------------------------------------------------------------------

// An alias for the empty effect.
// pub alias total = <>

// An alias for pure effects: a pure function always returns the same result
// when called with the same arguments but may not terminate or raise an exception.
pub alias purestd/core/pure: E = <std/core/types/total: Eexnstd/core/exn/exn: (E, V) -> V,divstd/core/types/div: X>

// The `:global-scope` is a special type constant to denote the global scope
pub type global-scopestd/core/global-scope: S :: S

// The `:net` effect signifies a function may access the network
pub type netstd/core/net: X :: X

// The `:fsys` effect signifies a function may access the file system
pub type fsysstd/core/fsys: X :: X

// The `:ui` effect signifies a function may access the graphics system
pub type uistd/core/ui: X :: X

// The `:blocking` effect signifies that a function may block
pub type blockingstd/core/blocking: X :: X

// The `:io-total` effect is used for functions that perform arbitrary I/O operations, but are terminating without raising exceptions.
pub alias io-totalstd/core/io-total: E = <std/core/types/total: Endetstd/core/types/ndet: X,consolestd/core/console/console: X,netstd/core/net: X,fsysstd/core/fsys: X,uistd/core/ui: X,ststd/core/types/st: H -> E<globalstd/core/types/global: H>>

// The `:io-noexn` effect is used for functions that perform arbitrary I/O operations, but raise no exceptions
pub alias io-noexnstd/core/io-noexn: E = <std/core/types/total: Edivstd/core/types/div: X,io-totalstd/core/io-total: E>

// The `:io` effect is used for functions that perform arbitrary I/O operations.
pub alias iostd/core/io: E = <std/core/types/total: Eexnstd/core/exn/exn: (E, V) -> V,io-noexnstd/core/io-noexn: E>

// The `:named` effect is the default umbrella effect for named effects
pub type nmdstd/core/nmd: X :: X

// The `:scope` effect is used to ensure named effects cannot escape the scope of their handler
pub type scopestd/core/scope: S -> X :: S -> X


// ----------------------------------------------------------------------------
// Standard Functions
// ----------------------------------------------------------------------------

// Apply a function `f` to a specified argument `x`.
pub fun applystd/core/apply: forall<a,b,e> (f : (a) -> e b, x : a) -> e b(ff: (_189) -> _190 _191,xx: _189)result: -> 203 202
  ff: (_189) -> _190 _191(xx: _189)

// Compose two functions `f` and `g`.
pub fun ostd/core/o: forall<a,b,c,e> (f : (a) -> e b, g : (c) -> e a) -> ((x : c) -> e b)(ff: (_227) -> _219 _220,gg: (_218) -> _219 _227)result: -> total (x : 243) -> 244 242
  fnfn: (x : _218) -> _219 _220(xx: _218) ff: (_227) -> _219 _220(gg: (_218) -> _219 _227(xx: _218))

// The `ignore` function ignores its argument.
pub fun ignorestd/core/ignore: forall<a> (x : a) -> ()( xx: $259 : aa: V )result: -> total () : (std/core/types/unit: V)std/core/types/unit: V
  (std/core/types/Unit: ())std/core/types/Unit: ()

// Return a 'constant' function that ignores its argument and always returns the same result
pub fun conststd/core/const: forall<a,b> (default : a) -> ((x : b) -> a)( defaultdefault: $272 : aa: V )result: -> total (x : 287) -> 286 : totalstd/core/types/total: E (( x : bb: V ) -> astd/core/types/total: E)
  fnfn: ($273) -> $272(_) defaultdefault: $272

// Concise way to ensure two expressions have the same type.
pub fun same-typestd/core/same-type: forall<a> (x : a, y : a) -> a( xx: $295 : aa: V, yy: $295 : aa: V )result: -> total 303 : astd/core/types/total: E
  xx: $295

// ----------------------------------------------------------------------------
// Control statements
// ----------------------------------------------------------------------------

// The `while` fun executes `action`  as long as `pred`  is `true`.
pub fun whilestd/core/while: forall<e> (predicate : () -> <div|e> bool, action : () -> <div|e> ()) -> <div|e> ()( predicatepredicate: () -> <div|$308> bool : () -> <divstd/core/types/div: X|std/core/types/effect-extend: (X, E) -> Eee: E> boolstd/core/types/bool: V, actionaction: () -> <div|$308> () : () -> <divstd/core/types/div: X|std/core/types/effect-extend: (X, E) -> Eee: E> (std/core/types/unit: V)std/core/types/unit: V )result: -> <div|329> () : <divstd/core/types/div: X|std/core/types/effect-extend: (X, E) -> Eee: E> (std/core/types/unit: V)std/core/types/unit: V
  if predicatepredicate: () -> <div|$308> bool() then
    actionaction: () -> <div|$308> ()()
    whilestd/core/while: (predicate : () -> <div|$308> bool, action : () -> <div|$308> ()) -> <div|$308> ()(predicatepredicate: () -> <div|$308> bool, actionaction: () -> <div|$308> ())std/core/types/Unit: ()

// The `repeat` fun executes `action`  `n`  times.
pub fun repeatstd/core/repeat: forall<e> (n : int, action : () -> e ()) -> e ()( ^nn: int : intstd/core/types/int: V, actionaction: () -> $1355 () : () -> ee: E (std/core/types/unit: V)std/core/types/unit: V )result: -> 1371 () : ee: E (std/core/types/unit: V)std/core/types/unit: V
  forstd/core/for: (n : int, action : (int) -> $1355 ()) -> $1355 ()(nn: int) fnfn: (i : int) -> $1355 ()(ii: int)
    actionaction: () -> $1355 ()()


// Executes `action`  for each integer from `start` to `end` (including `end` ).
// If `start > end`  the function returns without any call to `action` .
pub fun range/forstd/core/range/for: forall<e> (start : int, end : int, action : (int) -> e ()) -> e ()( ^startstart: int: intstd/core/types/int: V, endend: int : intstd/core/types/int: V, actionaction: (int) -> $1257 () : (intstd/core/types/int: V) -> ee: E (std/core/types/unit: V)std/core/types/unit: V )result: -> 1326 () : ee: E (std/core/types/unit: V)std/core/types/unit: V
  fun reprep: (i : int) -> $1257 ()( ^ii: int : intstd/core/types/int: V )result: -> $1257 ()
    if ii: int <=std/core/int/(<=): (x : int, y : int) -> $1257 bool endend: int then
      actionaction: (int) -> $1257 ()(ii: int)
      reprep: (i : int) -> $1257 ()(pretend-decreasingstd/core/undiv/pretend-decreasing: (x : int) -> $1257 int(ii: int.incstd/core/int/inc: (i : int) -> $1257 int))std/core/types/Unit: ()
  reprep: (i : int) -> $1257 ()(startstart: int)

// Executes `action` `n` times for each integer from `0` to `n - 1`.
// If `n <= 0`  the function returns without any call to `action` .
pub fun forstd/core/for: forall<e> (n : int, action : (int) -> e ()) -> e ()( ^nn: int : intstd/core/types/int: V, actionaction: (int) -> $1330 () : (intstd/core/types/int: V) -> ee: E (std/core/types/unit: V)std/core/types/unit: V )result: -> 1349 () : ee: E (std/core/types/unit: V)std/core/types/unit: V
  range/forstd/core/range/for: (start : int, end : int, action : (int) -> $1330 ()) -> $1330 ()(0literal: int
dec  = 0
hex8 = 0x00
bit8 = 0b00000000, nn: int -std/core/int/(-): (x : int, y : int) -> $1330 int 1literal: int
dec  = 1
hex8 = 0x01
bit8 = 0b00000001, actionaction: (int) -> $1330 ())


// Executes `action`  for each integer between `start`  to `end`  (including `end` ).
// If `start > end`  the function returns without any call to `action` .
// If `action` returns `Just`, the iteration is stopped and the result returned
pub fun range/for-whilestd/core/range/for-while: forall<a,e> (start : int, end : int, action : (int) -> e maybe<a>) -> e maybe<a>( startstart: int: intstd/core/types/int: V, endend: int : intstd/core/types/int: V, actionaction: (int) -> $1376 maybe<$1375> : (intstd/core/types/int: V) -> ee: E maybestd/core/types/maybe: V -> V<aa: V> )result: -> 1469 maybe<1468> : ee: E maybestd/core/types/maybe: V -> V<aa: V>
  fun reprep: (i : int) -> $1376 maybe<$1375>( ii: int : intstd/core/types/int: V )result: -> $1376 maybe<$1375>
    if ii: int <=std/core/int/(<=): (x : int, y : int) -> $1376 bool endend: int then
      match actionaction: (int) -> $1376 maybe<$1375>(ii: int)
        Nothingstd/core/types/Nothing: forall<a> maybe<a> -> reprep: (i : int) -> $1376 maybe<$1375>(pretend-decreasingstd/core/undiv/pretend-decreasing: (x : int) -> $1376 int(ii: int.incstd/core/int/inc: (i : int) -> $1376 int))
        Juststd/core/types/Just: forall<a> (value : a) -> maybe<a>(xx: $1375) -> Juststd/core/types/Just: forall<a> (value : a) -> maybe<a>(xx: $1375)
    else Nothingstd/core/types/Nothing: forall<a> maybe<a>
  reprep: (i : int) -> $1376 maybe<$1375>(startstart: int)

// Executes `action`  for each integer between [0,`n`)  (excluding `n` ).
// If `n <= 0`  the function returns without any call to `action` .
// If `action` returns `Just`, the iteration is stopped and the result returned
pub fun for-whilestd/core/for-while: forall<a,e> (n : int, action : (int) -> e maybe<a>) -> e maybe<a>( nn: int : intstd/core/types/int: V, actionaction: (int) -> $1477 maybe<$1476> : (intstd/core/types/int: V) -> ee: E maybestd/core/types/maybe: V -> V<aa: V> )result: -> 1504 maybe<1503> : ee: E maybestd/core/types/maybe: V -> V<aa: V>
  range/for-whilestd/core/range/for-while: (start : int, end : int, action : (int) -> $1477 maybe<$1476>) -> $1477 maybe<$1476>(0literal: int
dec  = 0
hex8 = 0x00
bit8 = 0b00000000, nn: int -std/core/int/(-): (x : int, y : int) -> $1477 int 1literal: int
dec  = 1
hex8 = 0x01
bit8 = 0b00000001, actionaction: (int) -> $1477 maybe<$1476>)


// Fold over the integers between [`start`,`end`] (including `end`).
pub fun range/foldstd/core/range/fold: forall<a,e> (start : int, end : int, init : a, f : (int, a) -> e a) -> e a( startstart: int : intstd/core/types/int: V, endend: int : intstd/core/types/int: V, initinit: $729 : aa: V, ff: (int, $729) -> $730 $729 : (intstd/core/types/int: V,aa: V) -> ee: E aa: V )result: -> 812 811 : ee: E aa: V
  if startstart: int >std/core/int/(>): (x : int, y : int) -> $730 bool endend: int then initinit: $729 else
    val xx: $729 = ff: (int, $729) -> $730 $729(startstart: int,initinit: $729)
    foldstd/core/range/fold: (start : int, end : int, init : $729, f : (int, $729) -> $730 $729) -> $730 $729(pretend-decreasingstd/core/undiv/pretend-decreasing: (x : int) -> $730 int(startstart: int.incstd/core/int/inc: (i : int) -> $730 int), endend: int, xx: $729, ff: (int, $729) -> $730 $729)

// Fold over the integers between [0,`upto`)  (excluding `upto`).
pub fun foldstd/core/fold: forall<a,e> (upto : int, init : a, f : (int, a) -> e a) -> e a( uptoupto: int : intstd/core/types/int: V, initinit: $700 : aa: V, ff: (int, $700) -> $701 $700 : (intstd/core/types/int: V,aa: V) -> ee: E aa: V )result: -> 728 727 : ee: E aa: V
  range/foldstd/core/range/fold: (start : int, end : int, init : $700, f : (int, $700) -> $701 $700) -> $701 $700( 0literal: int
dec  = 0
hex8 = 0x00
bit8 = 0b00000000, uptoupto: int.decstd/core/int/dec: (i : int) -> $701 int, initinit: $700, ff: (int, $700) -> $701 $700 )


// Fold over the integers between [`start`,`end`] (including `end`) or until `f` returns `Nothing`
pub fun range/fold-whilestd/core/range/fold-while: forall<a,e> (start : int, end : int, init : a, f : (int, a) -> e maybe<a>) -> e a( startstart: int : intstd/core/types/int: V, endend: int : intstd/core/types/int: V, initinit: $858 : aa: V, ff: (int, $858) -> $859 maybe<$858> : (intstd/core/types/int: V,aa: V) -> ee: E maybestd/core/types/maybe: V -> V<aa: V> )result: -> 949 948 : ee: E aa: V
  if startstart: int >std/core/int/(>): (x : int, y : int) -> $859 bool endend: int then initinit: $858 else
    match ff: (int, $858) -> $859 maybe<$858>(startstart: int,initinit: $858)
      Juststd/core/types/Just: forall<a> (value : a) -> maybe<a>(xx: $858) -> range/fold-whilestd/core/range/fold-while: (start : int, end : int, init : $858, f : (int, $858) -> $859 maybe<$858>) -> $859 $858(pretend-decreasingstd/core/undiv/pretend-decreasing: (x : int) -> $859 int(startstart: int.incstd/core/int/inc: (i : int) -> $859 int), endend: int, xx: $858, ff: (int, $858) -> $859 maybe<$858>)
      Nothingstd/core/types/Nothing: forall<a> maybe<a> -> initinit: $858

// Fold over the integers between [0,`n`) (excluding `n`) or until `f` returns `Nothing`
pub fun fold-whilestd/core/fold-while: forall<a,e> (n : int, init : a, f : (int, a) -> e maybe<a>) -> e a( nn: int : intstd/core/types/int: V, initinit: $829 : aa: V, ff: (int, $829) -> $830 maybe<$829> : (intstd/core/types/int: V,aa: V) -> ee: E maybestd/core/types/maybe: V -> V<aa: V> )result: -> 857 856 : ee: E aa: V
  range/fold-whilestd/core/range/fold-while: (start : int, end : int, init : $829, f : (int, $829) -> $830 maybe<$829>) -> $830 $829( 0literal: int
dec  = 0
hex8 = 0x00
bit8 = 0b00000000, nn: int.decstd/core/int/dec: (i : int) -> $830 int, initinit: $829, ff: (int, $829) -> $830 maybe<$829> )


// ----------------------------------------------------------------------------
// Generic equality and comparison
// ----------------------------------------------------------------------------

// Generic inequality
pub fun default/(!=)std/core/default/(!=): forall<a,e> (x : a, y : a, @implicit/(==) : (a, a) -> e bool) -> e bool(xx: $418 : aa: V, yy: $418 : aa: V, (@implicit/==)?(==): ($418, $418) -> $419 bool : (aa: V,aa: V) -> ee: E boolstd/core/types/bool: V )result: -> 526 bool : ee: E boolstd/core/types/bool: V
  notstd/core/types/not: (b : bool) -> $419 bool(xx: $418==?(==): ($418, $418) -> $419 boolyy: $418)

// Generic equality if `cmp` exists
pub fun default/cmp/(==)std/core/default/cmp/(==): forall<a,e> (x : a, y : a, @implicit/cmp : (a, a) -> e order) -> e bool(xx: $339 : aa: V, yy: $339 : aa: V, @implicit/cmp?cmp: ($339, $339) -> $340 order : (aa: V,aa: V) -> ee: E orderstd/core/types/order: V )result: -> 411 bool : ee: E boolstd/core/types/bool: V
  match cmp?cmp: ($339, $339) -> $340 order(xx: $339,yy: $339)
    Eqstd/core/types/Eq: order -> Truestd/core/types/True: bool
    _  -> Falsestd/core/types/False: bool

// Generic greater than
pub fun default/cmp/(>)std/core/default/cmp/(>): forall<a,e> (x : a, y : a, @implicit/cmp : (a, a) -> e order) -> e bool(xx: $533 : aa: V, yy: $533 : aa: V, @implicit/cmp?cmp: ($533, $533) -> $534 order : (aa: V,aa: V) -> ee: E orderstd/core/types/order: V )result: -> 693 bool : ee: E boolstd/core/types/bool: V
  cmp?cmp: ($533, $533) -> $534 order(xx: $533,yy: $533) ==std/core/order/(==): (x : order, y : order) -> $534 bool Gtstd/core/types/Gt: order

// Generic lower than
pub fun default/cmp/(<)std/core/default/cmp/(<): forall<a,e> (x : a, y : a, @implicit/cmp : (a, a) -> e order) -> e bool(xx: $966 : aa: V, yy: $966 : aa: V, @implicit/cmp?cmp: ($966, $966) -> $967 order : (aa: V,aa: V) -> ee: E orderstd/core/types/order: V )result: -> 1126 bool : ee: E boolstd/core/types/bool: V
  cmp?cmp: ($966, $966) -> $967 order(xx: $966,yy: $966) ==std/core/order/(==): (x : order, y : order) -> $967 bool Ltstd/core/types/Lt: order

// Generic greater than or equal
pub fun default/cmp/(>=)std/core/default/cmp/(>=): forall<a,e> (x : a, y : a, @implicit/cmp : (a, a) -> e order) -> e bool(xx: $1133 : aa: V, yy: $1133 : aa: V, @implicit/cmp?cmp: ($1133, $1133) -> $1134 order : (aa: V,aa: V) -> ee: E orderstd/core/types/order: V )result: -> 1188 bool : ee: E boolstd/core/types/bool: V
  notstd/core/types/not: (b : bool) -> $1134 bool(xx: $1133 <std/core/default/cmp/(<): (x : $1133, y : $1133, @implicit/cmp : ($1133, $1133) -> $1134 order) -> $1134 bool
?cmp=?cmp yy: $1133)

// Generic lower than or equal
pub fun default/cmp/(<=)std/core/default/cmp/(<=): forall<a,e> (x : a, y : a, @implicit/cmp : (a, a) -> e order) -> e bool(xx: $1195 : aa: V, yy: $1195 : aa: V, @implicit/cmp?cmp: ($1195, $1195) -> $1196 order : (aa: V,aa: V) -> ee: E orderstd/core/types/order: V )result: -> 1250 bool : ee: E boolstd/core/types/bool: V
  notstd/core/types/not: (b : bool) -> $1196 bool(xx: $1195 >std/core/default/cmp/(>): (x : $1195, y : $1195, @implicit/cmp : ($1195, $1195) -> $1196 order) -> $1196 bool
?cmp=?cmp yy: $1195)


// ----------------------------------------------------------------------------
// Main
// ----------------------------------------------------------------------------

// Used by the compiler to wrap main console applications
pub extern main-consolestd/core/main-console: forall<a,e> (main : () -> e a) -> e a : forall<aa: V,ee: E> ( main : () -> ee: E aa: V ) -> ee: E aa: V
  c "kk_main_console"
  cs inline "Primitive.MainConsole<##1>(#1)"
  js inline "(#1)()"


// Return the host environment: `dotnet`, `browser`, `webworker`, `node`, or `libc`.
pub extern hoststd/core/host: () -> ndet string() : ndetstd/core/types/ndet: X stringstd/core/types/string: V
  c "kk_get_host"
  cs inline "\"dotnet\""
  js inline "$std_core_console._host"


// The default exception handler
pub fun @default-exn(actionaction: () -> <exn,console|$1550> () : () -> <exnstd/core/exn/exn: (E, V) -> V,consolestd/core/console/console: X|std/core/types/effect-extend: (X, E) -> Eee: E> (std/core/types/unit: V)std/core/types/unit: V )result: -> <console|1738> () : <consolestd/core/console/console: X|std/core/types/effect-extend: (X, E) -> Eee: E> (std/core/types/unit: V)std/core/types/unit: V
  handlehandler: (() -> <exn,console|$1550> ()) -> <console|$1550> ()( actionaction: () -> <exn,console|$1550> () )
    final ctl throw-exnthrow-exn: (exn : exception) -> <console|$1550> ()( exnexn: exception : exceptionstd/core/exn/exception: V )
      "uncaught exception: "literal: string
count= 20.printstd/core/console/string/print: (s : string) -> <console|$1550> ()
      exnexn: exception.printlnstd/core/console/default/show/println: (x : exception, @implicit/show : (exception) -> <console|$1550> string) -> <console|$1550> ()
?show=show


// ----------------------------------------------------------------------------
// Non determinism
// ----------------------------------------------------------------------------

noinline val unique-countstd/core/unique-count: ref<global,int> : refstd/core/types/ref: (H, V) -> V<globalstd/core/types/global: H,intstd/core/types/int: V> = unsafe-totalstd/core/unsafe/unsafe-total: (action : () -> <alloc<global>|_1760> ref<global,int>) -> ref<global,int>{ refstd/core/types/ref: (value : int) -> <alloc<global>|_1760> ref<global,int>(0literal: int
dec  = 0
hex8 = 0x00
bit8 = 0b00000000) }

// Returns a unique integer (modulo 32-bits).
pub fun uniquestd/core/unique: () -> ndet int()result: -> ndet int : ndetstd/core/types/ndet: X intstd/core/types/int: V
  unsafe-totalstd/core/unsafe/unsafe-total: (action : () -> <read<global>,write<global>|_1812> int) -> ndet int
    val uu: int = !std/core/types/ref/(!): (ref : ref<global,int>, @implicit/hdiv : hdiv<global,int,<write<global>|_1812>>) -> <read<global>,write<global>|_1812> int
?hdiv=iev@1782unique-countstd/core/unique-count: ref<global,int>
    unique-countstd/core/unique-count: ref<global,int> :=std/core/types/set: (ref : ref<global,int>, assigned : int) -> <write<global>,read<global>|_1812> () uu: int+std/core/int/(+): (x : int, y : int) -> <write<global>,read<global>|_1812> int1literal: int
dec  = 1
hex8 = 0x01
bit8 = 0b00000001
    uu: int


// ----------------------------------------------------------------------------
// Stream
// ----------------------------------------------------------------------------

// A `:stream` is a co-inductive type representing an infinite list of elements.
pub co type streamstd/core/stream: V -> V<aa: V>
  con Nextstd/core/Next: forall<a> (head : a, tail : stream<a>) -> stream<a>(headstd/core/stream/head: forall<a> (stream : stream<a>) -> a:aa: V, tailstd/core/stream/tail: forall<a> (stream : stream<a>) -> stream<a>: streamstd/core/stream: V -> V<aa: V> )