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freestrings / jsonpath

JsonPath engine written in Rust. Webassembly and Javascript support too

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Is there a way to check what delete has done?

gkorland opened this issue · comments

commented

Is there a way to get how many Values where deleted? or know if delete succeeded to delete?

commented

This is not possible with SelectorMut. If necessary, you can implement as follows. and i am still thinking whether to support the built-in count-aware delete function or not.

extern crate jsonpath_lib as jsonpath;
extern crate serde;
extern crate serde_json;

fn delete(json: serde_json::Value, path: &str) -> Result<(usize, Option<serde_json::Value>), jsonpath::JsonPathError> {
	let mut count = 0;
	let mut selector = jsonpath::SelectorMut::default();

	let ret = selector
		.value(json)
		.str_path(path)?
		.replace_with(&mut |_| {
			count = count + 1;
			serde_json::Value::Null
		})?
		.take();

	Ok((count, ret))
}

fn main() -> Result<(), jsonpath::JsonPathError> {
	let json = serde_json::from_str(r#"
	{
		"a": {
			"b": 2
		}
	}
	"#).unwrap();

	let (count, ret) = delete(json, "$.a.b")?;

	println!("{}, {:?}", count, ret);
	Ok(())
}