minify 1.3.0

Crate for text minification. Currently supported: html, json
Documentation 
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use crate::{
    io::{multi_filter::MultiFilter, reader::InternalReader},
    json::json_minifier::{keep_element, JsonMinifier},
};
use std::{io::Read, iter::Iterator, str::Chars};

mod json_minifier;

type JsonMethod = fn(
    &mut JsonMinifier,
    char,
    Option<char>,
    Option<char>,
    Option<char>,
    Option<char>,
    Option<char>,
) -> bool;
type JsonFilter<'a> = MultiFilter<Chars<'a>, JsonMethod, JsonMinifier>;

/// Reader Implementation for JSON minification
pub type Reader<R> = InternalReader<R, JsonMethod, JsonMinifier>;

/// Minifies a given String by JSON minification rules
///
/// # Example
///
/// ```rust
/// extern crate minify;
/// use minify::json::minify;
///
/// fn main() {
///     let json = r#"
///            {
///                "test": "test",
///                "test2": 2
///            }
///        "#;
///     let json_minified = minify(json);
/// }
/// ```
#[inline]
#[must_use]
pub fn minify(json: &str) -> String {
    let filtered = json.chars();
    JsonFilter::new(filtered, keep_element).collect()
}

/// Minifies a given Read by JSON minification rules
///
/// # Example
///
/// ```rust
/// extern crate minify;
/// use std::fs::File;
/// use std::io::Read;
/// use minify::json::minify_from_read;
///
/// fn main() {
///     let mut html_minified = String::new();
///     let mut file = File::open("tests/files/test.json").expect("file not found");
///     minify_from_read(file).read_to_string(&mut html_minified);
/// }
/// ```
#[inline]
pub fn minify_from_read<R: Read>(json: R) -> Reader<R> {
    Reader::new(json, keep_element)
}

#[test]
fn removal_from_read() {
    use std::fs::File;

    let file = File::open("tests/files/test.json").expect("file not found");
    let expected = "{\"test\":\"\\\" test2\",\"test2\":\"\",\"test3\":\" \"}";
    let mut actual = String::new();
    let _ = minify_from_read(file)
        .read_to_string(&mut actual)
        .expect("error at read");
    assert_eq!(actual, expected);
}

#[test]
fn removal_of_control_characters() {
    let input = "\n";
    let expected = "";
    let actual = minify(input);
    assert_eq!(actual, expected);
}

#[test]
fn removal_of_whitespace_outside_of_tags() {
    let input = r#"
            {
              "test": "\" test2",
              "test2": "",
              "test3": " "
            }
        "#;
    let expected = "{\"test\":\"\\\" test2\",\"test2\":\"\",\"test3\":\" \"}";
    let actual = minify(input);
    assert_eq!(actual, expected);
}