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discard """
output: '''
x + y = 30
'''
"""
import std/[sugar, algorithm, random, sets, tables, strutils]
template main() =
block: # `=>`
block:
let f1 = () => 42
doAssert f1() == 42
let f2 = (x: int) => x + 1
doAssert f2(42) == 43
let f3 = (x, y: int) => x + y
doAssert f3(1, 2) == 3
var x = 0
let f4 = () => (x = 12)
f4()
doAssert x == 12
let f5 = () => (discard) # simplest proc that returns void
f5()
block:
proc call1(f: () -> int): int = f()
doAssert call1(() => 12) == 12
proc call2(f: int -> int): int = f(42)
doAssert call2(x => x) == 42
doAssert call2((x) => x) == 42
doAssert call2((x: int) => x) == 42
proc call3(f: (int, int) -> int): int = f(1, 2)
doAssert call3((x, y) => x + y) == 3
doAssert call3((x, y: int) => x + y) == 3
doAssert call3((x: int, y: int) => x + y) == 3
var a = 0
proc call4(f: int -> void) = f(42)
call4((x: int) => (a = x))
doAssert a == 42
proc call5(f: (int {.noSideEffect.} -> int)): int = f(42)
doAssert call5(x {.noSideEffect.} => x + 1) == 43
block: # `->`
doAssert $(() -> int) == "proc (): int{.closure.}"
doAssert $(float -> int) == "proc (i0: float): int{.closure.}"
doAssert $((float) -> int) == "proc (i0: float): int{.closure.}"
doAssert $((float, bool) -> int) == "proc (i0: float, i1: bool): int{.closure.}"
doAssert $(() -> void) == "proc (){.closure.}"
doAssert $(float -> void) == "proc (i0: float){.closure.}"
doAssert $((float) -> void) == "proc (i0: float){.closure.}"
doAssert $((float, bool) -> void) == "proc (i0: float, i1: bool){.closure.}"
doAssert $(() {.inline.} -> int) == "proc (): int{.inline.}"
doAssert $(float {.inline.} -> int) == "proc (i0: float): int{.inline.}"
doAssert $((float) {.inline.} -> int) == "proc (i0: float): int{.inline.}"
doAssert $((float, bool) {.inline.} -> int) == "proc (i0: float, i1: bool): int{.inline.}"
block: # capture
var closure1: () -> int
for i in 0 .. 10:
if i == 5:
capture i:
closure1 = () => i
doAssert closure1() == 5
var closure2: () -> (int, int)
for i in 0 .. 10:
for j in 0 .. 10:
if i == 5 and j == 3:
capture i, j:
closure2 = () => (i, j)
doAssert closure2() == (5, 3)
block: # bug #16967
var s = newSeq[proc (): int](5)
{.push exportc.}
proc bar() =
for i in 0 ..< s.len:
let foo = i + 1
capture foo:
s[i] = proc(): int = foo
{.pop.}
bar()
for i, p in s.pairs:
let foo = i + 1
doAssert p() == foo
block: # dup
block dup_with_field:
type
Foo = object
col, pos: int
name: string
proc inc_col(foo: var Foo) = inc(foo.col)
proc inc_pos(foo: var Foo) = inc(foo.pos)
proc name_append(foo: var Foo, s: string) = foo.name &= s
let a = Foo(col: 1, pos: 2, name: "foo")
block:
let b = a.dup(inc_col, inc_pos):
_.pos = 3
name_append("bar")
inc_pos
doAssert(b == Foo(col: 2, pos: 4, name: "foobar"))
block:
let b = a.dup(inc_col, pos = 3, name = "bar"):
name_append("bar")
inc_pos
doAssert(b == Foo(col: 2, pos: 4, name: "barbar"))
block:
var a = @[1, 2, 3, 4, 5, 6, 7, 8, 9]
doAssert dup(a, sort(_)) == sorted(a)
doAssert a.dup(sort) == sorted(a)
# Chaining:
var aCopy = a
aCopy.insert(10)
doAssert a.dup(insert(10)).dup(sort()) == sorted(aCopy)
block:
when nimvm: discard
else:
const b = @[0, 1, 2]
discard b.dup shuffle()
doAssert b[0] == 0
doAssert b[1] == 1
block: # collect
let data = @["bird", "word"] # if this gets stuck in your head, its not my fault
doAssert collect(newSeq, for (i, d) in data.pairs: (if i mod 2 == 0: d)) == @["bird"]
doAssert collect(initTable(2), for (i, d) in data.pairs: {i: d}) ==
{0: "bird", 1: "word"}.toTable
doAssert collect(initHashSet(), for d in data.items: {d}) == data.toHashSet
block:
let x = collect(newSeqOfCap(4)):
for (i, d) in data.pairs:
if i mod 2 == 0: d
doAssert x == @["bird"]
block: # bug #12874
let bug = collect(
newSeq,
for (i, d) in data.pairs:(
block:
if i mod 2 == 0:
d
else:
d & d
)
)
doAssert bug == @["bird", "wordword"]
block:
let y = collect(newSeq):
for (i, d) in data.pairs:
try: parseInt(d) except: 0
doAssert y == @[0, 0]
block:
let z = collect(newSeq):
for (i, d) in data.pairs:
case d
of "bird": "word"
else: d
doAssert z == @["word", "word"]
block:
proc tforum(): seq[int] =
collect(newSeq):
for y in 0..10:
if y mod 5 == 2:
for x in 0..y:
x
doAssert tforum() == @[0, 1, 2, 0, 1, 2, 3, 4, 5, 6, 7]
block:
let x = collect:
for d in data.items:
when d is int: "word"
else: d
doAssert x == @["bird", "word"]
block:
doAssert collect(for (i, d) in pairs(data): (i, d)) == @[(0, "bird"), (1, "word")]
doAssert collect(for d in data.items: (try: parseInt(d) except: 0)) == @[0, 0]
doAssert collect(for (i, d) in pairs(data): {i: d}) ==
{1: "word", 0: "bird"}.toTable
doAssert collect(for d in data.items: {d}) == data.toHashSet
block: # bug #14332
template foo =
discard collect(newSeq, for i in 1..3: i)
foo()
proc mainProc() =
block: # dump
# symbols in templates are gensym'd
let
x = 10
y = 20
dump(x + y) # x + y = 30
block: # dumpToString
template square(x): untyped = x * x
let x = 10
doAssert dumpToString(square(x)) == "square(x): x * x = 100"
let s = dumpToString(doAssert 1+1 == 2)
doAssert "failedAssertImpl" in s
let s2 = dumpToString:
doAssertRaises(AssertionDefect): doAssert false
doAssert "except AssertionDefect" in s2
static:
main()
mainProc()
main()
mainProc()
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