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//!The crate provides a basic mechanism to parse grammars using Logo as a lexer
//! and a simple recursive descendant LL(1) parser with a backtracking function.
//!
//! # Example
//!```
//! use crate::parsit::token;
//! use crate::parsit::step::Step;
//! use crate::parsit::parser::EmptyToken;
//! use crate::parsit::parser::ParseIt;
//! use crate::parsit::error::ParseError;
//! use logos::Logos;
//!
//!
//! #[derive(Logos, Debug, Copy, Clone, PartialEq)]
//! pub enum Token<'a> {
//! #[regex(r"[a-zA-Z-]+")]
//! Word(&'a str),
//!
//! #[token(",")]
//! Comma,
//! #[token(".")]
//! Dot,
//!
//! #[token("!")]
//! Bang,
//! #[token("?")]
//! Question,
//!
//! #[regex(r"[ \t\r\n]+", logos::skip)]
//! Whitespace,
//! #[error]
//! Error,
//! }
//!
//! #[derive(Debug, Copy, Clone, PartialEq)]
//! enum Item<'a> {
//! Word(&'a str),
//! Comma,
//! }
//! #[derive(Debug, Clone, PartialEq)]
//! enum Sentence<'a> {
//! Sentence(Vec<Item<'a>>),
//! Question(Vec<Item<'a>>),
//! Exclamation(Vec<Item<'a>>),
//! }
//!
//! struct Parser<'a> {
//! inner: ParseIt<'a, Token<'a>>,
//! }
//!
//! impl<'a> Parser<'a> {
//! fn new(text: &'a str) -> Parser<'a> {
//! let delegate: ParseIt<Token> = ParseIt::new(text).unwrap();
//! Parser { inner: delegate }
//! }
//!
//! fn sentence(&self, pos: usize) -> Step<'a,Sentence<'a>> {
//! let items = |p| self.inner.one_or_more(p, |p| self.word(p));
//!
//! let sentence = |p| items(p)
//! .then_zip(|p| token!(self.inner.token(p) => Token::Dot))
//! .take_left()
//! .map(Sentence::Sentence);
//!
//! let exclamation = |p| items(p)
//! .then_zip(|p| token!(self.inner.token(p) => Token::Bang))
//! .take_left()
//! .map(Sentence::Exclamation);
//! let question = |p| items(p)
//! .then_zip(|p| token!(self.inner.token(p) => Token::Question))
//! .take_left()
//! .map(Sentence::Question);
//!
//! sentence(pos)
//! .or_from(pos)
//! .or(exclamation)
//! .or(question).into()
//! }
//! fn word(&self, pos: usize) -> Step<'a,Item<'a>> {
//! token!(self.inner.token(pos) =>
//! Token::Word(v) => Item::Word(v),
//! Token::Comma => Item::Comma
//! )
//! }
//! fn text(&self) -> Result<Vec<Sentence<'a>>, ParseError<'a>> {
//! self.inner.zero_or_more(0, |p| self.sentence(p)).into()
//! }
//! }
//!
//!
//! let parser = Parser::new(r#"
//! I have a strange addiction,
//! It often sets off sparks!
//! I really cannot seem to stop,
//! Using exclamation marks!
//! Anyone heard of the interrobang?
//! The poem is for kids.
//! "#);
//!
//! let result = parser.text();
//! println!("{:?}",result);
//!
//! ```
//!
//!