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when not declared(sysFatal):
include "system/fatal"
import std/private/miscdollars
# ---------------------------------------------------------------------------
# helpers
type InstantiationInfo = tuple[filename: string, line: int, column: int]
proc `$`(x: int): string {.magic: "IntToStr", noSideEffect.}
proc `$`(info: InstantiationInfo): string =
# The +1 is needed here
# instead of overriding `$` (and changing its meaning), consider explicit name.
result = ""
result.toLocation(info.filename, info.line, info.column+1)
# ---------------------------------------------------------------------------
when not defined(nimHasSinkInference):
{.pragma: nosinks.}
proc raiseAssert*(msg: string) {.noinline, noreturn, nosinks.} =
sysFatal(AssertionDefect, msg)
proc failedAssertImpl*(msg: string) {.raises: [], tags: [].} =
# trick the compiler to not list ``AssertionDefect`` when called
# by ``assert``.
type Hide = proc (msg: string) {.noinline, raises: [], noSideEffect,
tags: [].}
cast[Hide](raiseAssert)(msg)
template assertImpl(cond: bool, msg: string, expr: string, enabled: static[bool]) =
when enabled:
const
loc = instantiationInfo(fullPaths = compileOption("excessiveStackTrace"))
ploc = $loc
bind instantiationInfo
mixin failedAssertImpl
{.line: loc.}:
if not cond:
failedAssertImpl(ploc & " `" & expr & "` " & msg)
template assert*(cond: untyped, msg = "") =
## Raises ``AssertionDefect`` with `msg` if `cond` is false. Note
## that ``AssertionDefect`` is hidden from the effect system, so it doesn't
## produce ``{.raises: [AssertionDefect].}``. This exception is only supposed
## to be caught by unit testing frameworks.
##
## The compiler may not generate any code at all for ``assert`` if it is
## advised to do so through the ``-d:danger`` or ``--assertions:off``
## `command line switches <nimc.html#compiler-usage-commandminusline-switches>`_.
##
## .. code-block:: nim
## static: assert 1 == 9, "This assertion generates code when not built with -d:danger or --assertions:off"
const expr = astToStr(cond)
assertImpl(cond, msg, expr, compileOption("assertions"))
template doAssert*(cond: untyped, msg = "") =
## Similar to ``assert`` but is always turned on regardless of ``--assertions``.
##
## .. code-block:: nim
## static: doAssert 1 == 9, "This assertion generates code when built with/without -d:danger or --assertions:off"
const expr = astToStr(cond)
assertImpl(cond, msg, expr, true)
template onFailedAssert*(msg, code: untyped): untyped {.dirty.} =
## Sets an assertion failure handler that will intercept any assert
## statements following `onFailedAssert` in the current module scope.
##
## .. code-block:: nim
## # module-wide policy to change the failed assert
## # exception type in order to include a lineinfo
## onFailedAssert(msg):
## var e = new(TMyError)
## e.msg = msg
## e.lineinfo = instantiationInfo(-2)
## raise e
##
template failedAssertImpl(msgIMPL: string): untyped {.dirty.} =
let msg = msgIMPL
code
template doAssertRaises*(exception: typedesc, code: untyped) =
## Raises ``AssertionDefect`` if specified ``code`` does not raise `exception`.
## Example:
##
## .. code-block:: nim
## doAssertRaises(ValueError):
## raise newException(ValueError, "Hello World")
var wrong = false
const begin = "expected raising '" & astToStr(exception) & "', instead"
const msgEnd = " by: " & astToStr(code)
template raisedForeign = raiseAssert(begin & " raised foreign exception" & msgEnd)
when Exception is exception:
try:
if true:
code
wrong = true
except Exception as e: discard
except: raisedForeign()
else:
try:
if true:
code
wrong = true
except exception:
discard
except Exception as e: raiseAssert(begin & " raised '" & $e.name & "'" & msgEnd)
except: raisedForeign()
if wrong:
raiseAssert(begin & " nothing was raised" & msgEnd)
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