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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

//! Unicode character composition and decomposition utilities
//! as described in
//! [Unicode Standard Annex #15](http://www.unicode.org/reports/tr15/).
//!
//! ```rust
//! extern crate unicode_normalization;
//!
//! use unicode_normalization::char::compose;
//! use unicode_normalization::UnicodeNormalization;
//!
//! fn main() {
//!     assert_eq!(compose('A','\u{30a}'), Some('Å'));
//!
//!     let s = "ÅΩ";
//!     let c = s.nfc().collect::<String>();
//!     assert_eq!(c, "ÅΩ");
//! }
//! ```
//!
//! # crates.io
//!
//! You can use this package in your project by adding the following
//! to your `Cargo.toml`:
//!
//! ```toml
//! [dependencies]
//! unicode-normalization = "0.1.8"
//! ```

#![deny(missing_docs, unsafe_code)]
#![doc(html_logo_url = "https://unicode-rs.github.io/unicode-rs_sm.png",
       html_favicon_url = "https://unicode-rs.github.io/unicode-rs_sm.png")]

extern crate smallvec;

pub use tables::UNICODE_VERSION;
pub use decompose::Decompositions;
pub use quick_check::{
    IsNormalized,
    is_nfc,
    is_nfc_quick,
    is_nfkc,
    is_nfkc_quick,
    is_nfc_stream_safe,
    is_nfc_stream_safe_quick,
    is_nfd,
    is_nfd_quick,
    is_nfkd,
    is_nfkd_quick,
    is_nfd_stream_safe,
    is_nfd_stream_safe_quick,
};
pub use recompose::Recompositions;
pub use stream_safe::StreamSafe;
use std::str::Chars;

mod decompose;
mod normalize;
mod recompose;
mod quick_check;
mod stream_safe;
mod tables;

#[cfg(test)]
mod test;
#[cfg(test)]
mod normalization_tests;

/// Methods for composing and decomposing characters.
pub mod char {
    pub use normalize::{decompose_canonical, decompose_compatible, compose};

    /// Look up the canonical combining class of a character.
    pub use tables::canonical_combining_class;

    /// Return whether the given character is a combining mark (`General_Category=Mark`)
    pub use tables::is_combining_mark;
}


/// Methods for iterating over strings while applying Unicode normalizations
/// as described in
/// [Unicode Standard Annex #15](http://www.unicode.org/reports/tr15/).
pub trait UnicodeNormalization<I: Iterator<Item=char>> {
    /// Returns an iterator over the string in Unicode Normalization Form D
    /// (canonical decomposition).
    #[inline]
    fn nfd(self) -> Decompositions<I>;

    /// Returns an iterator over the string in Unicode Normalization Form KD
    /// (compatibility decomposition).
    #[inline]
    fn nfkd(self) -> Decompositions<I>;

    /// An Iterator over the string in Unicode Normalization Form C
    /// (canonical decomposition followed by canonical composition).
    #[inline]
    fn nfc(self) -> Recompositions<I>;

    /// An Iterator over the string in Unicode Normalization Form KC
    /// (compatibility decomposition followed by canonical composition).
    #[inline]
    fn nfkc(self) -> Recompositions<I>;

    /// An Iterator over the string with Conjoining Grapheme Joiner characters
    /// inserted according to the Stream-Safe Text Process (UAX15-D4)
    #[inline]
    fn stream_safe(self) -> StreamSafe<I>;
}

impl<'a> UnicodeNormalization<Chars<'a>> for &'a str {
    #[inline]
    fn nfd(self) -> Decompositions<Chars<'a>> {
        decompose::new_canonical(self.chars())
    }

    #[inline]
    fn nfkd(self) -> Decompositions<Chars<'a>> {
        decompose::new_compatible(self.chars())
    }

    #[inline]
    fn nfc(self) -> Recompositions<Chars<'a>> {
        recompose::new_canonical(self.chars())
    }

    #[inline]
    fn nfkc(self) -> Recompositions<Chars<'a>> {
        recompose::new_compatible(self.chars())
    }

    #[inline]
    fn stream_safe(self) -> StreamSafe<Chars<'a>> {
        StreamSafe::new(self.chars())
    }
}

impl<I: Iterator<Item=char>> UnicodeNormalization<I> for I {
    #[inline]
    fn nfd(self) -> Decompositions<I> {
        decompose::new_canonical(self)
    }

    #[inline]
    fn nfkd(self) -> Decompositions<I> {
        decompose::new_compatible(self)
    }

    #[inline]
    fn nfc(self) -> Recompositions<I> {
        recompose::new_canonical(self)
    }

    #[inline]
    fn nfkc(self) -> Recompositions<I> {
        recompose::new_compatible(self)
    }

    #[inline]
    fn stream_safe(self) -> StreamSafe<I> {
        StreamSafe::new(self)
    }
}