jawk 0.1.16

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

use bigdecimal::{BigDecimal, Zero};

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

pub fn get() -> FunctionDefinitions {
    FunctionDefinitions::new("\"-\"", 1, 2, |args| {
        struct Impl(Vec<Rc<dyn Get>>);
        impl Get for Impl {
            fn get(&self, value: &Context) -> Option<JsonValue> {
                if let (Some(num1), Some(num2)) = if self.0.len() == 1 {
                    (Some(BigDecimal::zero()), self.0.apply(value, 0).to_big_decimal())
                } else {
                    (self.0.apply(value, 0).to_big_decimal(), self.0.apply(value, 1).to_big_decimal())
                } {
                    Some((num1 - num2).into())
                } else {
                    None
                }
            }
        }
        Rc::new(Impl(args))
    })
    .add_alias("nas_minus")
    .add_alias("nas_take_away")
    .add_alias("nas_substruct")
    .add_description_line("If there are two numeric arguments, subtract the second argument from the first one if both are number.")
    .add_description_line("If there is one numeric arguments, return the negative of that number.")
    .add_example(
        Example::new()
            .add_argument("\"100\"")
            .add_argument("\"3\"")
            .expected_output("\"97\""),
    )
    .add_example(
        Example::new()
            .add_argument("\"10\"")
            .add_argument("\"3.2\"")
            .expected_output("\"6.8\""),
    )
    .add_example(
        Example::new()
            .add_argument("\"10\"")
            .expected_output("\"-10\""),
    )
    .add_example(
        Example::new()
            .add_argument("\"-11.3\"")
            .expected_output("\"11.3\""),
    )
    .add_example(Example::new().add_argument("\"10\"").add_argument("\"text\""))
    .add_example(Example::new().add_argument("null").add_argument("\"6\""))
    .add_example(Example::new().add_argument("{}"))
}