Function minifier::js::clean_tokens_except

pub fn clean_tokens_except<'a, F: Fn(&Token<'a>) -> bool>(
    tokens: Tokens<'a>, 
    f: F
) -> Tokens<'a>

Same as clean_tokens except that if a token is considered as not desired, the callback is called. If the callback returns false as well, it will be removed.

Example

extern crate minifier;

use minifier::js::{clean_tokens_except, simple_minify, ReservedChar};
use std::fs;

fn main() {
    let content = fs::read("some_file.js").expect("file not found");
    let source = String::from_utf8_lossy(&content);
    let s = simple_minify(&source); // First we get the tokens list.
    let s = s.apply(|f| {
        clean_tokens_except(f, |c| {
            c.get_char() != Some(ReservedChar::Backline)
        })
    });  // We now have a cleaned token list which kept backlines!
    println!("result: {:?}", s);
}