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("set", 3, 3, |args| {
        struct Impl(Vec<Rc<dyn Get>>);
        impl Get for Impl {
            fn get(&self, context: &Context) -> Option<JsonValue> {
                if
                let (Some(JsonValue::String(name)), Some(value)) = (
                    self.0.apply(context, 0),
                    self.0.apply(context, 1),
                )
                {
                    let new_context = context.with_variable(name, value);
                    self.0.apply(&new_context, 2)
                } else {
                    None
                }
            }
        }
        Rc::new(Impl(args))
    })
        .add_description_line(
            "Set a variable. The first argument should be the variable name, the second one should be the value and the third"
        )
        .add_description_line(" one should be the function to run with the variable.")
        .add_example(
            Example::new()
                .add_argument("\"foo\"")
                .add_argument("{\"key\": 100}")
                .add_argument("(get (: \"foo\") \"key\" )")
                .expected_output("100")
        )
        .add_example(
            Example::new()
                .add_argument("\"foo\"")
                .add_argument("{\"key\": 100}")
                .add_argument("(get :foo \"key\" )")
                .expected_output("100")
        )
        .add_example(
            Example::new()
                .add_argument("12")
                .add_argument("{\"key\": 100}")
                .add_argument("(get (: \"foo\") \"key\" )")
        )
        .add_example(
            Example::new()
                .add_argument("\"foo\"")
                .add_argument("{\"key\": 100}")
                .add_argument("(get (: 12) \"key\" )")
        )
}