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Idris2/tests/node/casts/Casts.idr
Stefan Höck 599d0635e9
[ refactor ] JS backend overhaul (#1609)
2021-07-10 11:15:21 +01:00

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Idris
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--
-- Primitive casts: Specification
--
-- a. Unsigned integers
--
-- Unsigned integers with a precision of x bit have a valid
-- range of [0,2^x - 1]. When casting from another integral type of value y,
-- the value is checked for being in bounds, and if it is not, the
-- unsigned remainder modulo 2^x of y is returned.
--
-- When casting from a `Double`, the value is first truncated towards 0,
-- before applying the inbounds check and (if necessary) calculating
-- the unsigned remainder modulo 2^x.
--
-- When casting from a `String`, the value is first converted to a floating
-- point number by the backend and then truncated as described above.
--
-- Example: For `Bits8` the valid range is [0,255]. Below are some
-- example casts.
--
-- cast {from = Integer} {to = Bits8} 12 = 12
-- cast {from = Integer} {to = Bits8} 256 = 0
-- cast {from = Integer} {to = Bits8} 259 = 3
-- cast {from = Integer} {to = Bits8} (-2) = 254
-- cast {from = Double} {to = Bits8} (-12.001) = 244
-- cast {from = Double} {to = Bits8} ("-12.001") = 244
--
-- b. Signed integers
--
-- Signed integers with a precision of x bit have a valid
-- range of [-2^(x-1),2^(x-1) - 1]. When casting from another
-- integral type of value y, the unsigned remainder module 2^x
-- is calculated. If the result is >= 2^(x-1), 2^x is subtracted
-- from the result. This is the same behavior as for instance in Haskell.
--
-- When casting from a `Double`, the value is first truncated towards 0,
-- before applying the inbounds check and (if necessary) truncating
-- the value.
--
-- When casting from a `String`, the value is first converted to a floating
-- point number by the backend and then truncated as described above.
--
-- Example: For `Int8` the valid range is [-128,127]. Below are some
-- example casts.
--
-- cast {from = Integer} {to = Int8} 12 = 12
-- cast {from = Integer} {to = Int8} 256 = 0
-- cast {from = Integer} {to = Int8} 259 = 4
-- cast {from = Integer} {to = Int8} (-128) = (-128)
-- cast {from = Integer} {to = Int8} (-129) = 127
-- cast {from = Double} {to = Int8} (-12.001) = (-12)
-- cast {from = Double} {to = Int8} ("-12.001") = (-12)
--
-- c. Characters
--
-- Casts from all integral types to `Char` are supported. Note however,
-- that only casts in the non-surrogate range are supported, that is
-- values in the ranges [0,0xd7ff] and [0xe000,0x10ffff], or, in decimal
-- notation, [0,55295] and [57344,1114111].
--
-- All casts from integer types to `Char` are therefore submitted to a
-- bounds check, and, in case the value is out of bounds, are converted to `'\0'`.
--
--
-- Test all casts from and to integral types.
-- The `Cast` implementations in here should go to `Prelude`, once
-- a new minor version of the compiler is released.
--
-- These tests verify also that the full range of integer literals
-- is supported for every integral type.
--
-- Nothing fancy is being done here:
-- All test cases have been hand-written.
import Data.List
--------------------------------------------------------------------------------
-- Tests
--------------------------------------------------------------------------------
showTpe : Type -> String
showTpe Bits16 = "Bits16"
showTpe Bits32 = "Bits32"
showTpe Bits64 = "Bits64"
showTpe Bits8 = "Bits8"
showTpe Char = "Char"
showTpe Double = "Double"
showTpe Int = "Int"
showTpe Int16 = "Int16"
showTpe Int32 = "Int32"
showTpe Int64 = "Int64"
showTpe Int8 = "Int8"
showTpe Integer = "Integer"
showTpe String = "String"
showTpe _ = "unknown type"
testCasts : (a: Type) -> (b : Type) -> (Cast a b, Show a, Show b, Eq b) =>
List (a,b) -> List String
testCasts a b = mapMaybe doTest
where doTest : (a,b) -> Maybe String
doTest (x,y) =
let y2 = cast {to = b} x
in if y == y2 then Nothing
else Just $ #"Invalid cast from \#{showTpe a} to \#{showTpe b}: "#
++ #"expected \#{show y} but got \#{show y2} when casting from \#{show x}"#
maxBits8 : Bits8
maxBits8 = 0xff
maxBits16 : Bits16
maxBits16 = 0xffff
maxBits32 : Bits32
maxBits32 = 0xffffffff
maxBits64 : Bits64
maxBits64 = 0xffffffffffffffff
results : List String
results = testCasts Int8 Int16 [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Int32 [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Int64 [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Int [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Double [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 String [(-129,"127"),(-128,"-128"),(0,"0"),(127,"127"),(128,"-128")]
++ testCasts Int8 Integer [(-129,127),(-128,-128),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Bits8 [(-129,127),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Bits16 [(-129,127),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Bits32 [(-129,127),(0,0),(127,127),(128,-128)]
++ testCasts Int8 Bits64 [(-129,127),(0,0),(127,127),(128,-128)]
++ testCasts Int16 Int8 [(-32769,32767),(-32768,0),(0,0),(32767,-1),(32768,0)]
++ testCasts Int16 Int32 [(-32769,32767),(-32768,-32768),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Int64 [(-32769,32767),(-32768,-32768),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Int [(-32769,32767),(-32768,-32768),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Double [(-32769,32767),(-32768,-32768),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 String [(-32769,"32767"),(-32768,"-32768"),(0,"0"),(32767,"32767"),(32768,"-32768")]
++ testCasts Int16 Integer [(-32769,32767),(-32768,-32768),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Bits8 [(-32769,32767),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Bits16 [(-32769,32767),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Bits32 [(-32769,32767),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int16 Bits64 [(-32769,32767),(0,0),(32767,32767),(32768,-32768)]
++ testCasts Int32 Int8 [(-2147483649,2147483647),(-2147483648,0),(0,0),(2147483647,-1),(2147483648,0)]
++ testCasts Int32 Int16 [(-2147483649,2147483647),(-2147483648,0),(0,0),(2147483647,-1),(2147483648,0)]
++ testCasts Int32 Int64 [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Int [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Double [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 String [(-2147483649,"2147483647"),(-2147483648,"-2147483648"),(0,"0"),(2147483647,"2147483647"),(2147483648,"-2147483648")]
++ testCasts Int32 Integer [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Bits8 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Bits16 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Bits32 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int32 Bits64 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int64 Int8 [(-9223372036854775809,9223372036854775807),(-9223372036854775808,0),(0,0),(9223372036854775807,-1),(9223372036854775808,0)]
++ testCasts Int64 Int16 [(-9223372036854775809,9223372036854775807),(-9223372036854775808,0),(0,0),(9223372036854775807,-1),(9223372036854775808,0)]
++ testCasts Int64 Int32 [(-9223372036854775809,9223372036854775807),(-9223372036854775808,0),(0,0),(9223372036854775807,-1),(9223372036854775808,0)]
++ testCasts Int64 Int [(-9223372036854775809,9223372036854775807),(-9223372036854775808,0),(0,0),(9223372036854775807,-1),(9223372036854775808,0)]
++ testCasts Int64 Double [(-9223372036854775809,9223372036854775807),(-9223372036854775808,-9223372036854775808),(0,0),(9223372036854775807,9223372036854775807),(9223372036854775808,-9223372036854775808)]
++ testCasts Int64 String [(-9223372036854775809,"9223372036854775807"),(-9223372036854775808,"-9223372036854775808"),(0,"0"),(9223372036854775807,"9223372036854775807"),(9223372036854775808,"-9223372036854775808")]
++ testCasts Int64 Integer [(-9223372036854775809,9223372036854775807),(-9223372036854775808,-9223372036854775808),(0,0),(9223372036854775807,9223372036854775807),(9223372036854775808,-9223372036854775808)]
++ testCasts Int64 Bits8 [(-9223372036854775809,255),(0,0),(9223372036854775807,0xff),(9223372036854775808,0)]
++ testCasts Int64 Bits16 [(-9223372036854775809,65535),(0,0),(9223372036854775807,0xffff),(9223372036854775808,0)]
++ testCasts Int64 Bits32 [(-9223372036854775809,4294967295),(0,0),(9223372036854775807,0xffffffff),(9223372036854775808,0)]
++ testCasts Int64 Bits64 [(-9223372036854775809,9223372036854775807),(0,0),(9223372036854775807,9223372036854775807),(9223372036854775808,-9223372036854775808)]
++ testCasts Int Int8 [(-2147483649,2147483647),(-2147483648,0),(0,0),(2147483647,-1),(2147483648,0)]
++ testCasts Int Int16 [(-2147483649,2147483647),(-2147483648,0),(0,0),(2147483647,-1),(2147483648,0)]
++ testCasts Int Int64 [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Int32 [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Double [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int String [(-2147483649,"2147483647"),(-2147483648,"-2147483648"),(0,"0"),(2147483647,"2147483647"),(2147483648,"-2147483648")]
++ testCasts Int Integer [(-2147483649,2147483647),(-2147483648,-2147483648),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Bits8 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Bits16 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Bits32 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Int Bits64 [(-2147483649,2147483647),(0,0),(2147483647,2147483647),(2147483648,-2147483648)]
++ testCasts Integer Int8 [(-170141183460469231731687303715884105729,-1),(-170141183460469231731687303715884105728,0),(0,0),(170141183460469231731687303715884105727,-1),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Int16 [(-170141183460469231731687303715884105729,-1),(-170141183460469231731687303715884105728,0),(0,0),(170141183460469231731687303715884105727,-1),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Int32 [(-170141183460469231731687303715884105729,-1),(-170141183460469231731687303715884105728,0),(0,0),(170141183460469231731687303715884105727,-1),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Int64 [(-170141183460469231731687303715884105729,-1),(-170141183460469231731687303715884105728,0),(0,0),(170141183460469231731687303715884105727,-1),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Int [(-170141183460469231731687303715884105729,-1),(-170141183460469231731687303715884105728,0),(0,0),(170141183460469231731687303715884105727,-1),(170141183460469231731687303715884105728,0)]
++ testCasts Integer String [(-170141183460469231731687303715884105729,"-170141183460469231731687303715884105729"),(-170141183460469231731687303715884105728,"-170141183460469231731687303715884105728"),(0,"0"),(170141183460469231731687303715884105727,"170141183460469231731687303715884105727"),(170141183460469231731687303715884105728,"170141183460469231731687303715884105728")]
++ testCasts Integer Bits8 [(-170141183460469231731687303715884105729,maxBits8),(0,0),(170141183460469231731687303715884105727,0xff),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Bits16 [(-170141183460469231731687303715884105729,maxBits16),(0,0),(170141183460469231731687303715884105727,0xffff),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Bits32 [(-170141183460469231731687303715884105729,maxBits32),(0,0),(170141183460469231731687303715884105727,0xffffffff),(170141183460469231731687303715884105728,0)]
++ testCasts Integer Bits64 [(-170141183460469231731687303715884105729,maxBits64),(0,0),(170141183460469231731687303715884105727,0xffffffffffffffff),(170141183460469231731687303715884105728,0)]
++ testCasts Bits8 Int8 [(0,0),(255,-1),(256,0)]
++ testCasts Bits8 Int16 [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Int32 [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Int64 [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Int [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Double [(0,0),(255,255),(256,0)]
++ testCasts Bits8 String [(0,"0"),(255,"255"),(256,"0")]
++ testCasts Bits8 Integer [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Bits16 [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Bits32 [(0,0),(255,255),(256,0)]
++ testCasts Bits8 Bits64 [(0,0),(255,255),(256,0)]
++ testCasts Bits16 Int8 [(0,0),(0xffff,-1),(0x10000,0)]
++ testCasts Bits16 Int16 [(0,0),(0xffff,-1),(0x10000,0)]
++ testCasts Bits16 Int32 [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 Int64 [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 Int [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 Double [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 String [(0,"0"),(0xffff,"65535"),(0x10000,"0")]
++ testCasts Bits16 Integer [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 Bits8 [(0,0),(0xffff,0xff),(0x10000,0)]
++ testCasts Bits16 Bits32 [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits16 Bits64 [(0,0),(0xffff,0xffff),(0x10000,0)]
++ testCasts Bits32 Int8 [(0,0),(0xffffffff,-1),(0x100000000,0)]
++ testCasts Bits32 Int16 [(0,0),(0xffffffff,-1),(0x100000000,0)]
++ testCasts Bits32 Int32 [(0,0),(0xffffffff,-1),(0x100000000,0)]
++ testCasts Bits32 Int64 [(0,0),(0xffffffff,0xffffffff),(0x100000000,0)]
++ testCasts Bits32 Int [(0,0),(0xffffffff,-1),(0x100000000,0)]
++ testCasts Bits32 Double [(0,0),(0xffffffff,0xffffffff),(0x100000000,0)]
++ testCasts Bits32 String [(0,"0"),(0xffffffff,"4294967295"),(0x100000000,"0")]
++ testCasts Bits32 Integer [(0,0),(0xffffffff,0xffffffff),(0x100000000,0)]
++ testCasts Bits32 Bits8 [(0,0),(0xffffffff,0xff),(0x100000000,0)]
++ testCasts Bits32 Bits16 [(0,0),(0xffffffff,0xffff),(0x100000000,0)]
++ testCasts Bits32 Bits64 [(0,0),(0xffffffff,0xffffffff),(0x100000000,0)]
++ testCasts Bits64 Int8 [(0,0),(0xffffffffffffffff,-1),(0x10000000000000000,0)]
++ testCasts Bits64 Int16 [(0,0),(0xffffffffffffffff,-1),(0x10000000000000000,0)]
++ testCasts Bits64 Int32 [(0,0),(0xffffffffffffffff,-1),(0x10000000000000000,0)]
++ testCasts Bits64 Int64 [(0,0),(0xffffffffffffffff,-1),(0x10000000000000000,0)]
++ testCasts Bits64 Int [(0,0),(0xffffffffffffffff,-1),(0x10000000000000000,0)]
++ testCasts Bits64 Double [(0,0),(0xffffffffffffffff,0xffffffffffffffff),(0x10000000000000000,0)]
++ testCasts Bits64 String [(0,"0"),(0xffffffffffffffff,"18446744073709551615"),(0x10000000000000000,"0")]
++ testCasts Bits64 Integer [(0,0),(0xffffffffffffffff,0xffffffffffffffff),(0x10000000000000000,0)]
++ testCasts Bits64 Bits8 [(0,0),(0xffffffffffffffff,0xff),(0x10000000000000000,0)]
++ testCasts Bits64 Bits16 [(0,0),(0xffffffffffffffff,0xffff),(0x10000000000000000,0)]
++ testCasts Bits64 Bits32 [(0,0),(0xffffffffffffffff,0xffffffff),(0x10000000000000000,0)]
++ testCasts String Int8 [("-129",127),("-128",-128),("0",0),("127",127), ("128",-128)]
++ testCasts String Int16 [("-32769",32767),("-32768",-32768),("0",0),("32767",32767), ("32768",-32768)]
++ testCasts String Int32 [("-2147483649",2147483647),("-2147483648",-2147483648),("0",0),("2147483647",2147483647), ("2147483648",-2147483648)]
++ testCasts String Int64 [("-9223372036854775809",9223372036854775807),("-9223372036854775808",-9223372036854775808),("0",0),("9223372036854775807",9223372036854775807), ("9223372036854775808",-9223372036854775808)]
++ testCasts String Int [("-2147483649",2147483647),("-2147483648",-2147483648),("0",0),("2147483647",2147483647), ("2147483648",-2147483648)]
++ testCasts String Integer [("-170141183460469231731687303715884105728",-170141183460469231731687303715884105728),("-170141183460469231731687303715884105728",-170141183460469231731687303715884105728),("0",0),("170141183460469231731687303715884105728",170141183460469231731687303715884105728)]
++ testCasts String Bits8 [("0",0),("255",255), ("256",0)]
++ testCasts String Bits16 [("0",0),("65535",65535), ("65536",0)]
++ testCasts String Bits32 [("0",0),("4294967295",4294967295), ("4294967296",0)]
++ testCasts String Bits64 [("0",0),("18446744073709551615",18446744073709551615), ("18446744073709551616",0)]
++ testCasts Double Int8 [(-129.0, 127),(-128.0,-128),(-12.001,-12),(12.001,12),(127.0,127),(128.0,-128)]
++ testCasts Double Int16 [(-32769.0, 32767),(-32768.0,-32768),(-12.001,-12),(12.001,12),(32767.0,32767),(32768.0,-32768)]
++ testCasts Double Int32 [(-2147483649.0,2147483647),(-2147483648.0,-2147483648),(-12.001,-12),(12.001,12),(2147483647.0,2147483647),(2147483648.0,-2147483648)]
++ testCasts Double Int64 [(-9223372036854775808.0,-9223372036854775808),(-12.001,-12),(12.001,12),(9223372036854775808.0,-9223372036854775808)]
++ testCasts Double Int [(-2147483649.0,2147483647),(-2147483648.0,-2147483648),(-12.001,-12),(12.001,12),(2147483647.0,2147483647),(2147483648.0,-2147483648)]
++ testCasts Double Bits8 [(0.0,0),(255.0,255), (256.0,0)]
++ testCasts Double Bits16 [(0.0,0),(65535.0,65535), (65536.0,0)]
++ testCasts Double Bits32 [(0.0,0),(4294967295.0,4294967295), (4294967296.0,0)]
++ testCasts Double Bits64 [(0.0,0),(18446744073709551616.0,0)]
++ testCasts Int8 Char [(-1, '\x0'), (80, 'P')]
++ testCasts Int16 Char [(-1, '\x0'), (80, 'P')]
++ testCasts Int32 Char [(-1, '\x0'), (80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
++ testCasts Int64 Char [(-1, '\x0'), (80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
++ testCasts Int Char [(-1, '\x0'), (80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
++ testCasts Bits8 Char [(80, 'P')]
++ testCasts Bits16 Char [(80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000')]
++ testCasts Bits32 Char [(80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
++ testCasts Bits64 Char [(80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
++ testCasts Integer Char [(-1, '\x0'), (80, 'P'), (55295, '\xd7ff'), (55296, '\x0'), (57344, '\xe000'), (1114111, '\x10ffff'), (1114112, '\x0')]
--------------------------------------------------------------------------------
-- Main
--------------------------------------------------------------------------------
main : IO ()
main = traverse_ putStrLn results
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