jawk 0.1.16

JSON AWK.
Documentation 
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use std::rc::Rc;

use indexmap::IndexMap;

use crate::{
    functions_definitions::{Example, FunctionDefinitions},
    json_value::JsonValue,
    processor::Context,
    selection::Get,
};

pub fn get() -> FunctionDefinitions {
    FunctionDefinitions::new("cross", 2, usize::MAX, |args| {
        struct Impl(Vec<Rc<dyn Get>>);
        impl Get for Impl {
            fn get(&self, value: &Context) -> Option<JsonValue> {
                let mut joined_list = vec![IndexMap::new()];
                let mut all_lists = Vec::with_capacity(self.0.len());
                for arg in &self.0 {
                    if let Some(JsonValue::Array(list)) = arg.get(value) {
                        all_lists.push(list);
                    } else {
                        return None;
                    }
                }
                for (i, lst) in all_lists.iter().enumerate() {
                    let key = format!(".{i}");
                    let mut new_joined_list = vec![];
                    for val in lst {
                        for so_far in &joined_list {
                            let mut datum = so_far.clone();
                            datum.insert(key.clone(), val.clone());
                            new_joined_list.push(datum);
                        }
                    }
                    joined_list = new_joined_list;
                }
                let joined_list: Vec<_> = joined_list
                    .iter()
                    .map(|f| f.clone().into())
                    .collect();
                Some(joined_list.into())
            }
        }
        Rc::new(Impl(args))
    })
        .add_description_line("Join a few list (i.e. Cartesian product) into a new list.")
        .add_description_line("All the arguments must be lists.")
        .add_description_line(
            "The output will be a list of object, with keys in the format \".i\"."
        )
        .add_example(
            Example::new()
                .add_argument("[\"one\", \"two\"]")
                .add_argument("[1, 2]")
                .add_argument("[true]")
                .add_argument("[false]")
                .expected_output(
                    "[{\".0\": \"one\", \".1\": 1, \".2\": true, \".3\": false}, {\".0\": \"two\", \".1\": 1, \".2\": true, \".3\": false}, {\".0\": \"one\", \".1\": 2, \".2\": true, \".3\": false}, {\".0\": \"two\", \".1\": 2, \".2\": true, \".3\": false}]"
                )
        )
        .add_example(
            Example::new()
                .add_argument("[\"one\", \"two\", \"three\"]")
                .add_argument("[1, 2, 3]")
                .add_argument("6")
        )
}