// SPDX-License-Identifier: AGPL-3.0-or-later

#![deny(clippy::complexity)]
#![deny(clippy::nursery)]
#![deny(clippy::pedantic)]
#![deny(clippy::perf)]
#![deny(clippy::suspicious)]
#![deny(clippy::alloc_instead_of_core)]
#![deny(clippy::as_underscore)]
#![deny(clippy::clone_on_ref_ptr)]
#![deny(clippy::create_dir)]
#![warn(clippy::dbg_macro)]
#![deny(clippy::default_numeric_fallback)]
#![deny(clippy::default_union_representation)]
#![deny(clippy::deref_by_slicing)]
#![deny(clippy::empty_structs_with_brackets)]
#![deny(clippy::exit)]
#![deny(clippy::expect_used)]
#![deny(clippy::filetype_is_file)]
#![deny(clippy::fn_to_numeric_cast)]
#![deny(clippy::format_push_string)]
#![deny(clippy::get_unwrap)]
#![deny(clippy::if_then_some_else_none)]
#![allow(
	clippy::implicit_return,
	reason = "returns should be done implicitly, not explicitly"
)]
#![deny(clippy::indexing_slicing)]
#![deny(clippy::large_include_file)]
#![deny(clippy::let_underscore_must_use)]
#![deny(clippy::lossy_float_literal)]
#![deny(clippy::map_err_ignore)]
#![deny(clippy::mem_forget)]
#![deny(clippy::missing_docs_in_private_items)]
#![deny(clippy::missing_trait_methods)]
#![deny(clippy::mod_module_files)]
#![deny(clippy::multiple_inherent_impl)]
#![deny(clippy::mutex_atomic)]
#![deny(clippy::needless_return)]
#![deny(clippy::non_ascii_literal)]
#![deny(clippy::panic_in_result_fn)]
#![deny(clippy::pattern_type_mismatch)]
#![deny(clippy::rc_buffer)]
#![deny(clippy::rc_mutex)]
#![deny(clippy::rest_pat_in_fully_bound_structs)]
#![deny(clippy::same_name_method)]
#![deny(clippy::separated_literal_suffix)]
#![deny(clippy::str_to_string)]
#![deny(clippy::string_add)]
#![deny(clippy::string_slice)]
#![deny(clippy::string_to_string)]
#![allow(
	clippy::tabs_in_doc_comments,
	reason = "tabs are preferred for this project"
)]
#![deny(clippy::try_err)]
#![deny(clippy::undocumented_unsafe_blocks)]
#![deny(clippy::unnecessary_self_imports)]
#![deny(clippy::unneeded_field_pattern)]
#![deny(clippy::unwrap_in_result)]
#![deny(clippy::unwrap_used)]
#![warn(clippy::use_debug)]
#![deny(clippy::verbose_file_reads)]
#![deny(clippy::wildcard_dependencies)]
#![deny(clippy::wildcard_enum_match_arm)]
#![deny(missing_copy_implementations)]
#![deny(missing_debug_implementations)]
#![deny(missing_docs)]
#![deny(single_use_lifetimes)]
#![deny(unsafe_code)]
#![deny(unused)]

//! # `brainf_lexer`
//!
//! Implementation of a Brainfuck lexer in Rust.

mod lexer;

pub use lexer::Token;
use logos::Logos;
use thiserror::Error;

/// Error type for lexer.
#[derive(Clone, Copy, Debug, Error)]
pub enum Error {
	/// Logos was unable to lex part of the input.
	#[error("lexer was unable to lex input")]
	LexingError,
}

/// Lexes the Brainfuck input, returning a Vec of Tokens.
///
/// # Errors
///
/// This function will return an error if the lexer is unable to lex one or more
/// of the input characters.
pub fn lex(input: &str) -> Result<Vec<Token>, Error> {
	lexer::Token::lexer(input).try_fold(Vec::new(), |mut arr, result| {
		result
			.map_or(Err(()), |token| {
				arr.push(token);
				Ok(arr)
			})
			.map_err(|_err| Error::LexingError)
	})
}