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//! A constructor of SQL statements.
//!
//! ## Example
//!
//! ```
//! use sql::prelude::*;
//!
//! // CREATE TABLE `users` (`id` INTEGER NOT NULL, `name` TEXT, `photo` BLOB)
//! println!("{}", create_table("users").column("id".integer().not_null())
//!                                     .column("name".string())
//!                                     .column("photo".binary())
//!                                     .compile().unwrap());
//!
//! // DELETE FROM `users`
//! println!("{}", delete_from("users").compile().unwrap());
//!
//! // INSERT INTO `users` (`id`, `name`) VALUES (?, ?), (?, ?)
//! println!("{}", insert_into("users").columns(&["id", "name"]).batch(2)
//!                                    .compile().unwrap());
//!
//! // SELECT * FROM `users` WHERE `name` LIKE 'A%'
//! println!("{}", select_from("users").so_that(column("name").like("A%"))
//!                                    .compile().unwrap());
//!
//! // SELECT * FROM `users` ORDER BY `name` DESC
//! println!("{}", select_from("users").order_by(column("name").descend())
//!                                    .compile().unwrap());
//!
//! // SELECT `name`, `photo` FROM `users` LIMIT 1
//! println!("{}", select_from("users").columns(&["name", "photo"]).limit(1)
//!                                    .compile().unwrap());
//! ```

use std::{error, fmt, result};

/// An error.
pub struct Error(String);

/// A result.
pub type Result<T> = result::Result<T, Error>;

/// A data type.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Type {
    /// The binary type.
    Binary,
    /// The floating-point type.
    Float,
    /// The integer type.
    Integer,
    /// The string type.
    String,
}

/// An object that can be assigend a type.
pub trait Typable where Self: Sized {
    /// The type produced after setting a type.
    type Output;

    /// Set the type.
    fn kind(self, value: Type) -> Self::Output;

    /// Set the type to `Binary`.
    #[inline]
    fn binary(self) -> Self::Output {
        self.kind(Type::Binary)
    }

    /// Set the type to `Float`.
    #[inline]
    fn float(self) -> Self::Output {
        self.kind(Type::Float)
    }

    /// Set the type to `Integer`.
    #[inline]
    fn integer(self) -> Self::Output {
        self.kind(Type::Integer)
    }

    /// Set the type to `String`.
    #[inline]
    fn string(self) -> Self::Output {
        self.kind(Type::String)
    }
}

impl fmt::Debug for Error {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(formatter)
    }
}

impl fmt::Display for Error {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        self.0.fmt(formatter)
    }
}

impl error::Error for Error {
    fn description(&self) -> &str {
        &self.0
    }
}

macro_rules! raise(
    ($message:expr) => (
        return Err(::Error($message.to_string()));
    );
);

pub mod grammar;
pub mod language;
pub mod prelude;