kappe/src/token.rs

#[derive(Debug, PartialEq)]
pub struct Token {
    pub token_type: TokenType,
    pub value: String,
}

impl Token {
    pub fn new(token_type: TokenType, value: &str) -> Self {
        Token {
            token_type,
            value: value.to_string(),
        }
    }
}

impl std::fmt::Display for Token {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(
            f,
            r#"{{ type: {}, value: "{}" }}"#,
            self.token_type, self.value
        )
    }
}

#[derive(Clone, Copy, Debug, PartialEq)]
pub enum TokenType {
    Comma,
    From,
    Equals,
    Identfiier,
    Number,
    Select,
    Star,
    String,
    Where,
}

impl std::fmt::Display for TokenType {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(
            f,
            "{}",
            match self {
                TokenType::Comma => "Comma",
                TokenType::Equals => "Equals",
                TokenType::Identfiier => "Identifier",
                TokenType::Number => "Number",
                TokenType::Star => "Star",
                TokenType::String => "String",

                TokenType::Select => "SELECT",
                TokenType::From => "FROM",
                TokenType::Where => "WHERE",
            }
        )
    }
}