#![allow(clippy::all)]
// Copied from regex_syntax crate to avoid pulling in the whole crate just for a utility function
// https://github.com/rust-lang/regex/blob/431c4e4867e1eb33eb39b23ed47c9934b2672f8f/regex-syntax/src/lib.rs
//
// Copyright (c) 2014 The Rust Project Developers
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

pub fn escape(text: &str) -> String {
    let mut quoted = String::new();
    escape_into(text, &mut quoted);
    quoted
}

fn escape_into(text: &str, buf: &mut String) {
    buf.reserve(text.len());
    for c in text.chars() {
        if is_meta_character(c) {
            buf.push('\\');
        }
        buf.push(c);
    }
}

fn is_meta_character(c: char) -> bool {
    match c {
        '\\' | '.' | '+' | '*' | '?' | '(' | ')' | '|' | '[' | ']' | '{' | '}' | '^' | '$'
        | '#' | '&' | '-' | '~' => true,
        _ => false,
    }
}