# lib.rs - source
Source of the Rust file `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/unindent-0.1.7/src/lib.rs`.
Keywords: rust, rustlang, rust-lang

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    //! [![github]](https://github.com/dtolnay/indoc)&ensp;[![crates-io]](https://crates.io/crates/unindent)&ensp;[![docs-rs]](https://docs.rs/unindent)
    //!
    //! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
    //! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
    //! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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
    //!
    //! <br>
    //!
    //! ## Unindent
    //!
    //! This crate provides [`indoc`]'s indentation logic for use with strings that
    //! are not statically known at compile time. For unindenting string literals,
    //! use `indoc` instead.
    //!
    //! [`indoc`]: https://github.com/dtolnay/indoc
    //!
    //! This crate exposes two unindent functions and an extension trait:
    //!
    //! - `fn unindent(&str) -> String`
    //! - `fn unindent_bytes(&[u8]) -> Vec<u8>`
    //! - `trait Unindent`
    //!
    //! ```
    //! use unindent::unindent;
    //!
    //! fn main() {
    //!     let indented = "
    //!             line one
    //!             line two";
    //!     assert_eq!("line one\nline two", unindent(indented));
    //! }
    //! ```
    //!
    //! The `Unindent` extension trait expose the same functionality under an
    //! extension method.
    //!
    //! ```
    //! use unindent::Unindent;
    //!
    //! fn main() {
    //!     let indented = format!("
    //!             line {}
    //!             line {}", "one", "two");
    //!     assert_eq!("line one\nline two", indented.unindent());
    //! }
    //! ```

    #![doc(html_root_url = "https://docs.rs/unindent/0.1.6")]
    #![allow(clippy::type_complexity)]

    use std::iter::Peekable;
    use std::slice::Split;

    pub fn unindent(s: &str) -> String {
        let bytes = s.as_bytes();
        let unindented = unindent_bytes(bytes);
        String::from_utf8(unindented).unwrap()
    }

    // Compute the maximal number of spaces that can be removed from every line, and
    // remove them.
    pub fn unindent_bytes(s: &[u8]) -> Vec<u8> {
        // Document may start either on the same line as opening quote or
        // on the next line
        let ignore_first_line = s.starts_with(b"\n") || s.starts_with(b"\r\n");

        // Largest number of spaces that can be removed from every
        // non-whitespace-only line after the first
        let spaces = s
            .lines()
            .skip(1)
            .filter_map(count_spaces)
            .min()
            .unwrap_or(0);

        let mut result = Vec::with_capacity(s.len());
        for (i, line) in s.lines().enumerate() {
            if i > 1 || (i == 1 && !ignore_first_line) {
                result.push(b'\n');
            }
            if i == 0 {
                // Do not un-indent anything on same line as opening quote
                result.extend_from_slice(line);
            } else if line.len() > spaces {
                // Whitespace-only lines may have fewer than the number of spaces
                // being removed
                result.extend_from_slice(&line[spaces..]);
            }
        }
        result
    }

    pub trait Unindent {
        type Output;

        fn unindent(&self) -> Self::Output;
    }

    impl Unindent for str {
        type Output = String;

        fn unindent(&self) -> Self::Output {
            unindent(self)
        }
    }

    impl Unindent for String {
        type Output = String;

        fn unindent(&self) -> Self::Output {
            unindent(self)
        }
    }

    impl Unindent for [u8] {
        type Output = Vec<u8>;

        fn unindent(&self) -> Self::Output {
            unindent_bytes(self)
        }
    }

    impl<'a, T: ?Sized + Unindent> Unindent for &'a T {
        type Output = T::Output;

        fn unindent(&self) -> Self::Output {
            (**self).unindent()
        }
    }

    // Number of leading spaces in the line, or None if the line is entirely spaces.
    fn count_spaces(line: &[u8]) -> Option<usize> {
        for (i, ch) in line.iter().enumerate() {
            if *ch != b' ' && *ch != b'\t' {
                return Some(i);
            }
        }
        None
    }

    // Based on core::str::StrExt.
    trait BytesExt {
        fn lines(&self) -> Lines;
    }

    impl BytesExt for [u8] {
        fn lines(&self) -> Lines {
            fn is_newline(b: &u8) -> bool {
                *b == b'\n'
            }
            let bytestring = if self.starts_with(b"\r\n") {
                &self[1..]
            } else {
                self
            };
            Lines {
                split: bytestring.split(is_newline as fn(&u8) -> bool).peekable(),
            }
        }
    }

    struct Lines<'a> {
        split: Peekable<Split<'a, u8, fn(&u8) -> bool>>,
    }

    impl<'a> Iterator for Lines<'a> {
        type Item = &'a [u8];

        fn next(&mut self) -> Option<Self::Item> {
            match self.split.next() {
                None => None,
                Some(fragment) => {
                    if fragment.is_empty() && self.split.peek().is_none() {
                        None
                    } else {
                        Some(fragment)
                    }
                }
            }
        }
    }