minify 1.3.0

Crate for text minification. Currently supported: html, json
Documentation 
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use crate::io::{
    multi_filter::MultiFilter,
    unstable::{Chars, CharsError},
};
use std::{
    fmt::{self, Formatter},
    io::{Read, Result},
    iter::{FilterMap, Iterator},
    result,
};

pub type Filter<R> = FilterMap<Chars<R>, fn(result::Result<char, CharsError>) -> Option<char>>;

pub struct InternalReader<R: Read, P, M> {
    iter: MultiFilter<Filter<R>, P, M>,
    bytes: Option<Vec<u8>>,
    pos_bytes: usize,
}

impl<R: Read, P, M: Default> InternalReader<R, P, M> {
    pub fn new(inner_reader: R, predicate: P) -> Self {
        Self {
            iter: MultiFilter::new(
                Chars {
                    inner: inner_reader,
                }
                .filter_map(Self::filter_map_result_error),
                predicate,
            ),
            bytes: None,
            pos_bytes: 0,
        }
    }

    #[allow(clippy::needless_pass_by_value)]
    fn filter_map_result_error(result: result::Result<char, CharsError>) -> Option<char> {
        match result {
            Ok(e) => Some(e),
            _ => None,
        }
    }

    fn handle_bytes(
        &mut self,
        bytes: Vec<u8>,
        bytes_start: usize,
        buf: &mut [u8],
        buf_start: usize,
    ) -> usize {
        let mut pos_bytes = bytes_start;
        let mut pos_buf = buf_start;

        for item in buf.iter_mut().skip(buf_start) {
            if pos_bytes < bytes.len() {
                *item = bytes[pos_bytes];
                pos_bytes += 1;
                pos_buf += 1;
            } else {
                break;
            }
        }
        if pos_bytes < bytes.len() {
            self.pos_bytes = pos_bytes;
            self.bytes = Some(bytes);
        }
        pos_buf
    }
}

impl<R: Read + fmt::Debug, P, M> fmt::Debug for InternalReader<R, P, M> {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        f.debug_struct("InternalReader")
            .field("iter", &self.iter)
            .field("bytes", &self.bytes)
            .field("pos_bytes", &self.pos_bytes)
            .finish()
    }
}

impl<R, P, M> Read for InternalReader<R, P, M>
where
    R: Read,
    P: FnMut(
        &mut M,
        char,
        Option<char>,
        Option<char>,
        Option<char>,
        Option<char>,
        Option<char>,
    ) -> bool,
    M: Default,
{
    fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
        let mut pos_buffer = 0;

        if let Some(item) = self.bytes.take() {
            let pos_bytes = self.pos_bytes;
            pos_buffer = self.handle_bytes(item, pos_bytes, buf, 0);
            if pos_buffer >= buf.len() {
                return Ok(pos_buffer);
            }
        }

        while let Some(item) = self.iter.next() {
            let bytes = item.to_string().into_bytes();
            pos_buffer = self.handle_bytes(bytes, 0, buf, pos_buffer);
            if pos_buffer >= buf.len() {
                break;
            }
        }
        Ok(pos_buffer)
    }
}