can opa team provide some code sample about using if else loop in a rule?

[zhoupoko2000]

I try to make below code work. basically, this requires embedding a if else loop inside a rule block...but I keep getting error no matter how I tweak the code...any suggestion here?

the error I got in rego playground is:

1 error occurred: policy.rego:45: rego_parse_error: unexpected { token: expected \n or ; or }

patch := [add_new_patch] {

where input is:

{ "message": "world" }
the code is:
`package play

default hello = false

make_new_patch(path, value) = patchCode {

patchCode = {
	"op": "make",
    "path": path,
    "value": value
}

}

add_new_patch(path, value) = patchCode {

patchCode = {
	"op": "add",
    "path": path,
    "value": value,
    "comment": "not make"
}

}

hello[patch] {
patch := [add_new_patch] {
input.message == "add"
} else := [make_new_patch]
}`

[anderseknert]

Both add_new_patch and make_new_patch are functions, but you are referencing them as if they were rules. I can't say I fully understand what you're trying to accomplish, but if you just want to make the function call conditionally, something like this would do it:

package play

make_new_patch(path, value) = patchCode {
    patchCode = {
        "op": "make",
        "path": path,
        "value": value
    }
}

add_new_patch(path, value) = patchCode {
    patchCode = {
        "op": "add",
        "path": path,
        "value": value,
        "comment": "not make"
    }
}

hello = add_new_patch("some_path", "some_value") {
	input.message == "add"
} else = make_new_patch("other_path", "other_value")

[zhoupoko2000]

hey Thanks.
I tried to figure out how to embed if else block within a rule or function. below seems work now.

package play

make_new_patch(path, value) = patchCode {
patchCode = {
"op": "make",
"path": path,
"value": value
}
}

add_new_patch(path, value) = patchCode {
patchCode = {
"op": "add",
"path": path,
"value": value,
"comment": "not make"
}
}

has_spec(obj) {
obj.spec
}

hello = add_new_patch("some_path", "some_value") {
input.message == "add"
} else = make_new_patch("other_path", "other_value")

patches[hello]{
has_spec(input.request)

}