//! Welcome to the syntect docs.
//!
//! Much more info about syntect is available on the [Github Page](https://github.com/trishume/syntect).
//!
//! May I suggest that you start by reading the `Readme.md` file in the main repo.
//! Once you're done with that you can look at the docs for [`parsing::SyntaxSet`]
//! and for the [`easy`] module.
//!
//! Almost everything in syntect is divided up into either the [`parsing`] module
//! for turning text into text annotated with scopes, and the [`highlighting`] module
//! for turning annotated text into styled/colored text.
//!
//! Some docs have example code but a good place to look is the `syncat` example as
//! well as the source code for the [`easy`] module in `easy.rs` as that shows how to
//! plug the various parts together for common use cases.
//!
//! [`parsing::SyntaxSet`]: parsing/struct.SyntaxSet.html
//! [`easy`]: easy/index.html
//! [`parsing`]: parsing/index.html
//! [`highlighting`]: highlighting/index.html

#![doc(html_root_url = "https://docs.rs/syntect/4.5.0")]

#[macro_use]
extern crate lazy_static;
#[macro_use]
extern crate serde_derive;
#[cfg(test)]
#[macro_use]
extern crate pretty_assertions;

#[cfg(any(feature = "dump-load-rs", feature = "dump-load", feature = "dump-create", feature = "dump-create-rs"))]
pub mod dumps;
#[cfg(feature = "parsing")]
pub mod easy;
#[cfg(feature = "html")]
mod escape;
pub mod highlighting;
#[cfg(feature = "html")]
pub mod html;
pub mod parsing;
pub mod util;

use std::io::Error as IoError;
use std::error::Error;
use std::fmt;

#[cfg(feature = "metadata")]
use serde_json::Error as JsonError;
#[cfg(all(feature = "yaml-load", feature = "parsing"))]
use crate::parsing::ParseSyntaxError;
use crate::highlighting::{ParseThemeError, SettingsError};

/// Common error type used by syntax and theme loading
#[derive(Debug)]
pub enum LoadingError {
    /// error finding all the files in a directory
    WalkDir(walkdir::Error),
    /// error reading a file
    Io(IoError),
    /// a syntax file was invalid in some way
    #[cfg(feature = "yaml-load")]
    ParseSyntax(ParseSyntaxError, Option<String>),
    /// a metadata file was invalid in some way
    #[cfg(feature = "metadata")]
    ParseMetadata(JsonError),
    /// a theme file was invalid in some way
    ParseTheme(ParseThemeError),
    /// a theme's Plist syntax was invalid in some way
    ReadSettings(SettingsError),
    /// A path given to a method was invalid.
    /// Possibly because it didn't reference a file or wasn't UTF-8.
    BadPath,
}

impl From<SettingsError> for LoadingError {
    fn from(error: SettingsError) -> LoadingError {
        LoadingError::ReadSettings(error)
    }
}

impl From<IoError> for LoadingError {
    fn from(error: IoError) -> LoadingError {
        LoadingError::Io(error)
    }
}

impl From<ParseThemeError> for LoadingError {
    fn from(error: ParseThemeError) -> LoadingError {
        LoadingError::ParseTheme(error)
    }
}

#[cfg(feature = "metadata")]
impl From<JsonError> for LoadingError {
    fn from(src: JsonError) -> LoadingError {
        LoadingError::ParseMetadata(src)
    }
}

#[cfg(all(feature = "yaml-load", feature = "parsing"))]
impl From<ParseSyntaxError> for LoadingError {
    fn from(error: ParseSyntaxError) -> LoadingError {
        LoadingError::ParseSyntax(error, None)
    }
}

impl fmt::Display for LoadingError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        use crate::LoadingError::*;

        match *self {
            WalkDir(ref error) => error.fmt(f),
            Io(ref error) => error.fmt(f),
            #[cfg(feature = "yaml-load")]
            ParseSyntax(ref error, ref filename) => {
                if let Some(ref file) = filename {
                    write!(f, "{}: {}", file, error)
                } else {
                    error.fmt(f)
                }
            },
            #[cfg(feature = "metadata")]
            ParseMetadata(_) => write!(f, "Failed to parse JSON"),
            ParseTheme(_) => write!(f, "Invalid syntax theme"),
            ReadSettings(_) => write!(f, "Invalid syntax theme settings"),
            BadPath => write!(f, "Invalid path"),
        }
    }
}

impl Error for LoadingError {
    fn cause(&self) -> Option<&dyn Error> {
        use crate::LoadingError::*;

        match *self {
            WalkDir(ref error) => Some(error),
            Io(ref error) => Some(error),
            _ => None,
        }
    }
}
