diff options
| -rw-r--r-- | lib/pure/future.nim | 21 | ||||
| -rw-r--r-- | tests/macros/tdump.nim | 13 |
2 files changed, 34 insertions, 0 deletions
diff --git a/lib/pure/future.nim b/lib/pure/future.nim index 67975cfcb..2a6d29933 100644 --- a/lib/pure/future.nim +++ b/lib/pure/future.nim @@ -177,3 +177,24 @@ macro `[]`*(lc: ListComprehension, comp, typ: untyped): untyped = newIdentNode("@"), newNimNode(nnkBracket))), result)))) + + +macro dump*(x: typed): untyped = + ## Dumps the content of an expression, useful for debugging. + ## It accepts any expression and prints a textual representation + ## of the tree representing the expression - as it would appear in + ## source code - together with the value of the expression. + ## + ## As an example, + ## + ## .. code-block:: nim + ## let + ## x = 10 + ## y = 20 + ## dump(x + y) + ## + ## will print ``x + y = 30``. + let s = x.toStrLit + let r = quote do: + debugEcho `s`, " = ", `x` + return r \ No newline at end of file diff --git a/tests/macros/tdump.nim b/tests/macros/tdump.nim new file mode 100644 index 000000000..e4c14dc6b --- /dev/null +++ b/tests/macros/tdump.nim @@ -0,0 +1,13 @@ +discard """ + output: '''x = 10 +x + y = 30 +''' +""" + +import future + +let + x = 10 + y = 20 +dump x +dump(x + y) \ No newline at end of file |