Skip to content

[nothing to see here] lib: Add functionInfo #194992

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
infinisil wants to merge 1 commit into from
Closed

[nothing to see here] lib: Add functionInfo #194992

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
61 changes: 61 additions & 0 deletions lib/trivial.nix
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -442,6 +442,67 @@ rec {
then f.__functionArgs or (lib.functionArgs (f.__functor f))
else builtins.functionArgs f;

getFunction = f:
if builtins.isFunction f then f
else if f ? __functor
then getFunction (f.__functor f)
else throw "getFunction: Not a function";

/*
functionInfo builtins.add ->
{
type = "builtin";
}

functionInfo (arg: arg + 1) ->
{
type = "argument";
argumentName = "arg";
}

functionInfo (arg@{ a }: a + 1) ->
{
type = "attributes";
argumentName = "arg";
attributes = { a = false; };
ellipsis = false;
}
functionInfo ({ a ? 0, ...}: a + 1) ->
{
type = "attributes";
argumentName = null;
attributes = { a = true; };
ellipsis = true;
}
*/
functionInfo = f:
let
function = getFunction f;
xmlString = builtins.toXML function;
builtinString = "<?xml version='1.0' encoding='utf-8'?>\n<expr>\n <unevaluated />\n</expr>\n";
argumentRegex = "<\\?xml version='1.0' encoding='utf-8'\\?>\n<expr>\n <function>\n <varpat name=\"(.*)\" />\n </function>\n</expr>\n";
Copy link
Member

@roberth roberth Oct 7, 2022

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

:O

I'll see myself out.

argumentMatch = builtins.match argumentRegex xmlString;
attributesRegex = "<\\?xml version='1.0' encoding='utf-8'\\?>\n<expr>\n <function>\n <attrspat( ellipsis=\"1\")?( name=\"(.*)\")?>.*\n </attrspat>\n </function>\n</expr>\n";
attributesMatch = builtins.match attributesRegex xmlString;
in
if builtinString == xmlString then {
type = "builtin";
}
else if argumentMatch != null then {
type = "argument";
argumentName = builtins.elemAt argumentMatch 0;
}
else if attributesMatch != null then {
type = "attributes";
argumentName =
if builtins.elemAt attributesMatch 1 != null
then builtins.elemAt attributesMatch 2
else null;
ellipsis = builtins.elemAt attributesMatch 0 != null;
attributes = builtins.functionArgs function;
}
else throw "functionInfo: Cannot parse builtins.toXML output (this is a bug): ${xmlString}";

/* Check whether something is a function or something
annotated with function args.
*/
Expand Down