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use crate::{ error::{IndexError, KeyError}, types::{State, Tokenizer}, }; /// /// [DefaultTokenizer](DefaultTokenizer) have a format query likes : /// ``` /// // [0].test.[1] /// // test.test.[1] /// ``` pub struct DefaultTokenizer; impl Tokenizer for DefaultTokenizer { /// Parse index array. /// /// - should starts and end with '[' and ']'. No space allowed. /// /// ```rust /// use querable::{types::Tokenizer, default::DefaultTokenizer, error::{IndexError}}; /// /// assert_eq!(DefaultTokenizer::index_parse("[]"), Err(IndexError::ParseError(String::from("[]")))); /// ``` /// /// - index should be an integer, specificially, in the range of usize. /// /// ```rust /// use querable::{types::Tokenizer, default::DefaultTokenizer}; /// /// assert!(DefaultTokenizer::index_parse("[x]").is_err()); /// ``` /// fn index_parse(key: &str) -> Result<usize, IndexError> { if key.starts_with('[') && key.ends_with(']') && key.len() > 2 { let index = &key[1..key.len() - 1]; index.parse::<usize>().map_err(IndexError::IntError) } else { Err(IndexError::ParseError(String::from(key))) } } /// Parse key/path index. /// /// - shouldn't be an empty string or being prefixed & suffixed with empty string. /// /// ```rust /// use querable::{types::Tokenizer, default::DefaultTokenizer, error::{KeyError}}; /// /// assert_eq!(DefaultTokenizer::dict_parse(" .test"), Err(KeyError::ParseError(String::from(" ")))); /// assert_eq!(DefaultTokenizer::dict_parse(""), Err(KeyError::EmptyKey)); /// ``` /// #[inline] fn dict_parse(key: &str) -> Result<State, KeyError> { if key.is_empty() { Err(KeyError::EmptyKey) } else { let size = key.len(); match key.find('.') { Some(0) => Err(KeyError::EmptyKey), Some(idx) => { let current = &key[0..idx]; match current.find(char::is_whitespace) { Some(_) => Err(KeyError::ParseError(String::from(current))), _ => { let pivot = idx + 1; Ok((Some(current), Some(&key[pivot..size]))) } } } _ => Ok((Some(&key[0..size]), None)), } } } } /// /// [SlashTokenizer](SlashTokenizer) have a format query likes : /// ``` /// // /0/1/2/3 /// // /test/test/1/test/test/2 /// ``` pub struct SlashTokenizer; impl Tokenizer for SlashTokenizer { #[inline] fn index_parse(key: &str) -> Result<usize, IndexError> { key.parse::<usize>().map_err(IndexError::IntError) } /// Parse dict key/path query. /// /// The query should : /// /// - starts with '/' /// /// ```rust /// use querable::{types::Tokenizer, default::SlashTokenizer, error::{KeyError, IndexError}}; /// assert_eq!(SlashTokenizer::dict_parse("test."), Err(KeyError::ParseError(String::from("test.")))); /// ``` /// /// - have no empty path /// /// ```rust /// use querable::{types::Tokenizer, default::SlashTokenizer, error::{KeyError, IndexError}}; /// assert_eq!(SlashTokenizer::dict_parse("//"), Err(KeyError::EmptyKey)); /// ``` /// /// - not an empty string /// /// ```rust /// use querable::{types::Tokenizer, default::SlashTokenizer, error::{KeyError, IndexError}}; /// assert_eq!(SlashTokenizer::dict_parse(""), Err(KeyError::EmptyKey)) /// ``` fn dict_parse(key: &str) -> Result<State, KeyError> { if key.is_empty() { Err(KeyError::EmptyKey) } else if !key.starts_with('/') { // key should always prefixed with slash Err(KeyError::ParseError(String::from(key))) } else { let size = key.len(); // /1/2 // 1/2 match key[1..size].find('/') { // since path is empty (case "//") Some(0) => Err(KeyError::EmptyKey), // if there is '/', then there will be next Some(idx) => { let pivot = idx + 1; let current = &key[1..pivot]; // check whether current have a whitespace or not // key shouldn't have a whitespace match current.find(char::is_whitespace) { Some(_) => Err(KeyError::ParseError(String::from(current))), _ => Ok((Some(current), Some(&key[pivot..size]))), } } _ => Ok((Some(&key[1..size]), None)), } } } }