#[cfg_attr(tarpaulin, skip)]
mod test_files {
    use std::ops::Deref;

    pub mod plain;
    pub mod rust_lang;

    #[cfg_attr(tarpaulin, skip)]
mod test_files {
    #[derive(Debug, Clone)]
    pub enum Language {
        PlainText,
    }

    #[derive(Debug, Clone)]
    pub enum TokenType {
        Whitespace { token: Token },
        Keyword { token: Token },
        String { token: Token },
        Number { token: Token },
        Identifier { token: Token },
        Literal { token: Token },
        Comment { token: Token },
        Operator { token: Token },
        Separator { token: Token },
    }

    impl TokenType {
        pub fn move_to(&self, line: usize, character: usize, start: usize, end: usize) -> Self {
            match self {
                TokenType::Whitespace { token } => TokenType::Whitespace {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Keyword { token } => TokenType::Keyword {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::String { token } => TokenType::String {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Number { token } => TokenType::Number {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Identifier { token } => TokenType::Identifier {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Literal { token } => TokenType::Literal {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Comment { token } => TokenType::Comment {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Operator { token } => TokenType::Operator {
                    token: token.move_to(line, character, start, end),
                },
                TokenType::Separator { token } => TokenType::Separator {
                    token: token.move_to(line, character, start, end),
                },
            }
        }

        pub fn is_new_line(&self) -> bool {
            match self {
                TokenType::Whitespace { token } => token.text().as_str() == "\n",
                _ => false,
            }
        }

        pub fn is_space(&self) -> bool {
            match self {
                TokenType::Whitespace { token } => token.text().as_str() == " ",
                _ => false,
            }
        }
    }

    impl Deref for TokenType {
        type Target = Token;

        fn deref(&self) -> &<Self as Deref>::Target {
            match self {
                TokenType::Whitespace { token } => token,
                TokenType::Keyword { token } => token,
                TokenType::String { token } => token,
                TokenType::Number { token } => token,
                TokenType::Identifier { token } => token,
                TokenType::Literal { token } => token,
                TokenType::Comment { token } => token,
                TokenType::Operator { token } => token,
                TokenType::Separator { token } => token,
            }
        }
    }

    #[derive(Debug, Clone)]
    pub struct Token {
        line: usize,
        character: usize,
        start: usize,
        end: usize,
        text: String,
    }

    #[derive(Debug, Clone, Copy)]
    pub struct Span {
        pub lo: usize,
        pub hi: usize,
    }

    impl Token {
        pub fn new(text: String, line: usize, character: usize, start: usize, end: usize) -> Self {
            Self {
                text,
                line,
                character,
                start,
                end,
            }
        }

        pub fn text(&self) -> &String {
            &self.text
        }

        pub fn line(&self) -> usize {
            self.line.clone()
        }

        pub fn character(&self) -> usize {
            self.character.clone()
        }

        pub fn start(&self) -> usize {
            self.start.clone()
        }

        pub fn end(&self) -> usize {
            self.end.clone()
        }

        pub fn move_to(&self, line: usize, character: usize, start: usize, end: usize) -> Self {
            Self {
                text: self.text.clone(),
                line,
                character,
                start,
                end,
            }
        }
    }

    pub fn parse(text: String, language: Language) -> Vec<TokenType> {
        match language {
            Language::PlainText => plain::lexer::Lexer::new(text.as_str())
                //            .inspect(|tok| println!("tok: {:?}", tok))
                .map(|t| t.0)
                .collect(),
        }
    }
}