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("define", 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(definition)) = (
                    self.0.apply(context, 0),
                    self.0.get(1),
                )
                {
                    let new_context = context.with_definition(name, definition);
                    self.0.apply(&new_context, 2)
                } else {
                    None
                }
            }
        }
        Rc::new(Impl(args))
    })
        .add_alias("macro")
        .add_alias("def")
        .add_alias("#")
        .add_description_line(
            "Define a new macro definition. The first argument should be the macro definition name, the second one should be macro and the third"
        )
        .add_description_line(" one should be the function to run with the macro.")
        .add_example(
            Example::new()
                .add_argument("\"add-1\"")
                .add_argument("(.+ 1)")
                .add_argument("(map [1, 2, 3] (@ \"add-1\"))")
                .expected_output("[2, 3, 4]")
        )
        .add_example(
            Example::new()
                .add_argument("\"add-1\"")
                .add_argument("(.+ 1)")
                .add_argument("(map [1, 2, 3] @add-1)")
                .expected_output("[2, 3, 4]")
        )
        .add_example(
            Example::new()
                .add_argument("\"three\"")
                .add_argument("3")
                .add_argument("(+ 1 @three)")
                .expected_output("4")
        )
        .add_example(
            Example::new()
                .add_argument("12")
                .add_argument("{\"key\": 100}")
                .add_argument("(get (: \"foo\") \"key\" )")
        )
}