jawk 0.1.16

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

use crate::processor::Context;
use crate::regex_cache::RegexCompile;

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

pub fn get() -> FunctionDefinitions {
    FunctionDefinitions::new("extract_regex_group", 3, 3, |args| {
        struct Impl(Vec<Rc<dyn Get>>);
        impl Get for Impl {
            fn get(&self, value: &Context) -> Option<JsonValue> {
                if
                let (
                    Some(JsonValue::String(str)),
                    Some(JsonValue::String(regex)),
                    Some(JsonValue::Number(index)),
                ) = (
                    self.0.apply(value, 0),
                    self.0.apply(value, 1),
                    self.0.apply(value, 2),
                )
                {
                    if
                    let (Ok(regex), Ok(index)) = (
                        &*value.compile_regex(&regex),
                        TryInto::<usize>::try_into(index),
                    )
                    {
                        if index > regex.captures_len() {
                            return None;
                        }
                        if let Some(captures) = regex.captures(&str) {
                            captures.get(index).map(|s| s.as_str().to_string().into())
                        } else {
                            None
                        }
                    } else {
                        None
                    }
                } else {
                    None
                }
            }
        }
        Rc::new(Impl(args))
    })
        .add_description_line("Return the capture group within the string.")
        .add_description_line(
            "The first argument is expected to be the string to apply the expression on."
        )
        .add_description_line(
            "The second argument is expected to be the string with the regular expression."
        )
        .add_description_line(
            "The third argument is expected to be the group index with in the regular expression (the first group index is one)."
        )
        .add_description_line(
            "For regular expression syntax, see [https://docs.rs/regex/latest/regex/#syntax]."
        )
        .add_description_line(
            "Use `--regular_expression_cache_size` so set a cache for compiled regular expressions."
        )
        .add_example(
            Example::new()
                .add_argument("\"hello 200 world\"")
                .add_argument("\"[a-z ]+([0-9]+)[a-z ]+\"")
                .add_argument("1")
                .expected_output("\"200\"")
                .explain(
                    "the regular expression is letters and spaces, group with numbers, and more letter and spaces, so the group is the string `\"200\"`."
                )
        )
        .add_example(
            Example::new()
                .add_argument("\"hello 200 world\"")
                .add_argument("\"[a-z ]+([0-9]+)[a-z ]+\"")
                .add_argument("20")
        )
        .add_example(
            Example::new()
                .add_argument("\"hello 200 world\"")
                .add_argument("\"[a-z ]+([0-9]+)[a-z ]+\"")
                .add_argument("0")
                .expected_output("\"hello 200 world\"")
        )
        .add_example(
            Example::new()
                .add_argument("\"test\"")
                .add_argument("\"[0-9\"")
                .add_argument("10")
        )
}