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proc isNamedTuple(T: typedesc): bool {.magic: "TypeTrait".}
## imported from typetraits
proc distinctBase(T: typedesc): typedesc {.magic: "TypeTrait".}
## imported from typetraits
proc repr*(x: NimNode): string {.magic: "Repr", noSideEffect.}
proc repr*(x: int): string {.magic: "IntToStr", noSideEffect.}
## repr for an integer argument. Returns `x`
## converted to a decimal string.
proc repr*(x: int64): string {.magic: "Int64ToStr", noSideEffect.}
## repr for an integer argument. Returns `x`
## converted to a decimal string.
proc repr*(x: uint64): string {.noSideEffect.} =
## repr for an unsigned integer argument. Returns `x`
## converted to a decimal string.
$x #Calls `$` from system/strmantle.nim
proc repr*(x: float): string {.magic: "FloatToStr", noSideEffect.}
## repr for a float argument. Returns `x`
## converted to a decimal string.
proc repr*(x: bool): string {.magic: "BoolToStr", noSideEffect.}
## repr for a boolean argument. Returns `x`
## converted to the string "false" or "true".
proc repr*(x: char): string {.noSideEffect.} =
## repr for a character argument. Returns `x`
## converted to an escaped string.
##
## .. code-block:: Nim
## assert repr('c') == "'c'"
result.add '\''
# Elides string creations if not needed
if x in {'\\', '\0'..'\31', '\127'..'\255'}:
result.add '\\'
if x in {'\0'..'\31', '\127'..'\255'}:
result.add $x.uint8
else:
result.add x
result.add '\''
proc repr*(x: string | cstring): string {.noSideEffect.} =
## repr for a string argument. Returns `x`
## converted to a quoted and escaped string.
result.add '\"'
for i in 0..<x.len:
if x[i] in {'"', '\\', '\0'..'\31', '\127'..'\255'}:
result.add '\\'
case x[i]:
of '\n':
result.add "n\n"
of '\0'..'\9', '\11'..'\31', '\127'..'\255':
result.add $x[i].uint8
else:
result.add x[i]
result.add '\"'
proc repr*[Enum: enum](x: Enum): string {.magic: "EnumToStr", noSideEffect.}
## repr for an enumeration argument. This works for
## any enumeration type thanks to compiler magic.
##
## If a `repr` operator for a concrete enumeration is provided, this is
## used instead. (In other words: *Overwriting* is possible.)
proc repr*(p: pointer): string =
## repr of pointer as its hexadecimal value
if p == nil:
result = "nil"
else:
when nimvm:
result = "ptr"
else:
const HexChars = "0123456789ABCDEF"
const len = sizeof(pointer) * 2
var n = cast[uint](p)
result = newString(len)
for j in countdown(len-1, 0):
result[j] = HexChars[n and 0xF]
n = n shr 4
proc repr*(p: proc): string =
## repr of a proc as its address
repr(cast[pointer](p))
template repr*(x: distinct): string =
repr(distinctBase(typeof(x))(x))
template repr*(t: typedesc): string = $t
proc reprObject[T: tuple|object](res: var string, x: T) =
res.add '('
var firstElement = true
const isNamed = T is object or isNamedTuple(T)
when not isNamed:
var count = 0
for name, value in fieldPairs(x):
if not firstElement: res.add(", ")
when isNamed:
res.add(name)
res.add(": ")
else:
count.inc
res.add repr(value)
firstElement = false
when not isNamed:
if count == 1:
res.add(',') # $(1,) should print as the semantically legal (1,)
res.add(')')
proc repr*[T: tuple|object](x: T): string =
## Generic `repr` operator for tuples that is lifted from the components
## of `x`. Example:
##
## .. code-block:: Nim
## $(23, 45) == "(23, 45)"
## $(a: 23, b: 45) == "(a: 23, b: 45)"
## $() == "()"
when T is object:
result = $typeof(x)
reprObject(result, x)
proc repr*[T](x: ref T | ptr T): string =
if isNil(x): return "nil"
when T is object:
result = $typeof(x)
reprObject(result, x[])
else:
result = when typeof(x) is ref: "ref " else: "ptr "
result.add repr(x[])
proc collectionToRepr[T](x: T, prefix, separator, suffix: string): string =
result = prefix
var firstElement = true
for value in items(x):
if firstElement:
firstElement = false
else:
result.add(separator)
result.add repr(value)
result.add(suffix)
proc repr*[T](x: set[T]): string =
## Generic `repr` operator for sets that is lifted from the components
## of `x`. Example:
##
## .. code-block:: Nim
## ${23, 45} == "{23, 45}"
collectionToRepr(x, "{", ", ", "}")
proc repr*[T](x: seq[T]): string =
## Generic `repr` operator for seqs that is lifted from the components
## of `x`. Example:
##
## .. code-block:: Nim
## $(@[23, 45]) == "@[23, 45]"
collectionToRepr(x, "@[", ", ", "]")
proc repr*[T, U](x: HSlice[T, U]): string =
## Generic `repr` operator for slices that is lifted from the components
## of `x`. Example:
##
## .. code-block:: Nim
## $(1 .. 5) == "1 .. 5"
result = repr(x.a)
result.add(" .. ")
result.add(repr(x.b))
proc repr*[T, IDX](x: array[IDX, T]): string =
## Generic `repr` operator for arrays that is lifted from the components.
collectionToRepr(x, "[", ", ", "]")
proc repr*[T](x: openArray[T]): string =
## Generic `repr` operator for openarrays that is lifted from the components
## of `x`. Example:
##
## .. code-block:: Nim
## $(@[23, 45].toOpenArray(0, 1)) == "[23, 45]"
collectionToRepr(x, "[", ", ", "]")
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