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Fixes the dirtyness of the filterIt template. Refs #351.

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Grzegorz Adam Hankiewicz
2013-03-16 23:07:59 +01:00
parent 29d0a774e9
commit e4c3515baf
1 changed files with 7 additions and 2 deletions
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9
lib/pure/collections/sequtils.nim
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@@ -117,7 +117,7 @@ proc filter*[T](seq1: seq[T], pred: proc(item: T): bool {.closure.}): seq[T] =
## assert f2 == @["yellow"]
accumulateResult(filter(seq1, pred))
template filterIt*(seq1, pred: expr): expr {.immediate, dirty.} =
template filterIt*(seq1, pred: expr): expr {.immediate.} =
## Returns a new sequence with all the items that fulfilled the predicate.
##
## Unlike the `proc` version, the predicate needs to be an expression using
@@ -128,9 +128,12 @@ template filterIt*(seq1, pred: expr): expr {.immediate, dirty.} =
## let
## temperatures = @[-272.15, -2.0, 24.5, 44.31, 99.9, -113.44]
## acceptable = filterIt(temperatures, it < 50 and it > -10)
## notAcceptable = filterIt(temperatures, it > 50 or it < -10)
## assert acceptable == @[-2.0, 24.5, 44.31]
## assert notAcceptable == @[-272.15, 99.9, -113.44]
var result {.gensym.}: type(seq1) = @[]
for it in items(seq1):
for internalit in items(seq1):
let it {.inject.} = internalit
if pred: result.add(it)
result
@@ -272,7 +275,9 @@ when isMainModule:
let
temperatures = @[-272.15, -2.0, 24.5, 44.31, 99.9, -113.44]
acceptable = filterIt(temperatures, it < 50 and it > -10)
notAcceptable = filterIt(temperatures, it > 50 or it < -10)
assert acceptable == @[-2.0, 24.5, 44.31]
assert notAcceptable == @[-272.15, 99.9, -113.44]
block: # toSeq test
let