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or on NimNode

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This commit is contained in:
Arne Döring 2018-07-19 16:26:07 +02:00
commit abe8ac1962
1 changed files with 16 additions and 1 deletions
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lib/core/macros.nim
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@ -176,6 +176,22 @@ proc `[]=`*(n: NimNode, i: BackwardsIndex, child: NimNode) =
## set `n`'s `i`'th child to `child`. ## set `n`'s `i`'th child to `child`.
n[n.len - i.int] = child n[n.len - i.int] = child
template `or`*(a,b: NimNode): NimNode =
## Evalutuate ``a`` and when it is not an empty node, return return
## it. Otherwise evaluate to ``b``. Can be used to chain several
## expressions that evaluates to the first expression that is not
## empty.
##
## .. code-block:: nim
##
## let node = mightBeEmpty() or mightAlsoBeEmpty() or fallbackNode
let arg = a
if arg != nil and arg.kind != nnkEmpty:
arg
else:
b
proc add*(father, child: NimNode): NimNode {.magic: "NAdd", discardable, proc add*(father, child: NimNode): NimNode {.magic: "NAdd", discardable,
noSideEffect, locks: 0.} noSideEffect, locks: 0.}
## Adds the `child` to the `father` node. Returns the ## Adds the `child` to the `father` node. Returns the
@ -1433,4 +1449,3 @@ proc getProjectPath*(): string = discard
## Returns the path to the currently compiling project, not to ## Returns the path to the currently compiling project, not to
## be confused with ``system.currentSourcePath`` which returns ## be confused with ``system.currentSourcePath`` which returns
## the path of the current module. ## the path of the current module.