jawk 0.1.16

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

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

pub fn get() -> FunctionDefinitions {
    FunctionDefinitions::new("flat_map", 2, 2, |args| {
        struct Impl(Vec<Rc<dyn Get>>);
        impl Get for Impl {
            fn get(&self, value: &Context) -> Option<JsonValue> {
                match self.0.apply(value, 0) {
                    Some(JsonValue::Array(list)) => {
                        let list: Vec<_> = list
                            .into_iter()
                            .filter_map(|v| {
                                let v = value.with_inupt(v);
                                if let Some(JsonValue::Array(list)) = self.0.apply(&v, 1) {
                                    Some(list)
                                } else {
                                    None
                                }
                            })
                            .flatten()
                            .collect();

                        Some(list.into())
                    }
                    _ => None,
                }
            }
        }
        Rc::new(Impl(args))
    })
        .add_description_line("Flat map a list into a new list using a function.")
        .add_description_line(
            "If the first argument is a list, activate the second argument on each item, and if that returns a list, add all the items to a new list."
        )
        .add_example(
            Example::new()
                .add_argument("[\"a,b,c\", \"d,e\", 4, \"g\"]")
                .add_argument("(split . \",\")")
                .expected_output("[\"a\", \"b\", \"c\", \"d\", \"e\", \"g\"]")
                .explain(
                    "it will split each element by the comma, and return a list of all those lists."
                )
        )
        .add_example(
            Example::new()
                .add_argument("[1, 2, 3, 4]")
                .add_argument("(.len)")
                .expected_output("[]")
        )
        .add_example(Example::new().add_argument("{}").add_argument("true"))
}