93 lines
3.4 KiB
Rust
93 lines
3.4 KiB
Rust
//! # eschac - a library for computing chess moves
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//!
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//! eschac implements fast legal move generation and a copy-make interface that enforces at compile
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//! time that no illegal move is played, with no runtime checks and no potential panics.
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//!
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//! ## Overview
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//!
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//! In eschac, a chess position is represented with the [`Position`](position::Position) type.
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//! [`Position::new`](position::Position::new) returns the starting position of a chess game, and
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//! arbitrary positions can be built using the [`Setup`](setup::Setup) type. This type must be
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//! validated and converted to a [`Position`](position::Position) to generate moves as eschac does
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//! not handle certain unreachable positions (see
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//! [`Setup::into_position`](setup::Setup::into_position) to know more). Legal moves are generated
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//! using the [`Position::legal_moves`](position::Position::legal_moves) method or obtained from
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//! chess notation like [`UciMove`](uci::UciMove) or [`San`](san::San). Moves are represented with
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//! the [`Move<'l>`](moves::Move) type, which holds a reference to the origin position (this
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//! ensures the move is played on the correct position). Finally, moves are played with
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//! [`Move::make`](moves::Move::make) which returns a new [`Position`](position::Position), and on
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//! it goes.
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//!
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//! ## Example
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//!
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//! ```
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//! # (|| -> Result<(), Box<dyn std::error::Error>> {
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//!
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//! use eschac::prelude::*;
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//!
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//! // read a position from a text record
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//! let setup = Setup::from_text_record("7k/4P1rp/5Q2/5p2/1Pp1bP2/8/r4K1P/6R1 w - -")?;
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//! let position = setup.into_position()?;
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//!
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//! // read a move in algebraic notation
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//! let san = "Ke1".parse::<San>()?;
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//! let m = san.to_move(&position)?;
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//!
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//! // play the move (note the absence of error handling)
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//! let position = m.make();
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//!
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//! // generate all the legal moves on the new position
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//! let moves = position.legal_moves();
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//! for m in moves {
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//! // print the UCI notation of each move
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//! println!("{}", m.to_uci());
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//! }
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//! # Ok(()) });
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//! ```
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//!
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//! ## Comparison with [shakmaty](https://crates.io/crates/shakmaty)
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//!
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//! shakmaty is another Rust library for chess processing. It is written by Niklas Fiekas, whose
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//! work greatly inspired the development of eschac. For most purposes, shakmaty is probably a
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//! better option, as eschac comes short of its miriad of features.
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//!
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//! Both libraries have the same core features:
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//! - vocabulary to describe the chessboard (squares, pieces, etc.)
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//! - parsing and editing positions
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//! - parsing standard move notations
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//! - fast legal move generation and play
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//!
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//! **eschac** distinguishes itself with:
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//! - a focus on performance
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//! - a more compact board representation
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//! - its use of the borrow checker to guarantee only legal moves are played
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//!
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//! **shakmaty** will be more suitable for a lot of applications, with:
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//! - vocabulary to describe and work with games, not just positions
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//! - insufficient material detection
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//! - PGN parsing
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//! - Zobrist hashing
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//! - Syzygy endgame tablebases
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//! - chess960 and other variants
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//! - etc.
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#![no_std]
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extern crate alloc;
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pub(crate) mod array_vec;
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pub(crate) mod lookup;
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pub(crate) mod magics;
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pub mod bitboard;
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pub mod board;
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pub mod moves;
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pub mod position;
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pub mod san;
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pub mod setup;
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pub mod uci;
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/// The eschac prelude.
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pub mod prelude {
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pub use crate::{position::Position, san::San, setup::Setup, uci::UciMove};
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}
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