gutenberg-rs 0.1.0

This crate is used to get information and data from gutenberg (https://www.gutenberg.org/)
Documentation 
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use crate::book::{Book, GutenbergFileEntry};
use crate::error::Error;
use crate::fst_parser_type::ParseType;
use indexmap::IndexMap;

#[derive(Default)]
pub struct ParseItemResult {
    pub item_links: Vec<usize>,
}

impl ParseItemResult {
    pub fn add(
        &mut self,
        parse_result: &mut ParseResult,
        parse_type: ParseType,
        data: String,
        book_id: i32,
    ) -> Result<(), Error> {
        let data_idx = parse_result.add_field(parse_type, data, book_id)?;
        self.item_links.push(data_idx);
        Ok(())
    }

    pub fn reset(&mut self) {
        self.item_links.clear();
    }
}

#[derive(Default)]
pub struct DictionaryItemContent {
    pub book_links: Vec<usize>,
}

#[derive(Default)]
pub struct ParseResult {
    pub books: Vec<Book>,
    pub field_dictionaries: Vec<IndexMap<String, DictionaryItemContent>>,
    pub files_dictionary: IndexMap<String, DictionaryItemContent>,
    pub file_types_dictionary: IndexMap<String, DictionaryItemContent>,
}

impl ParseResult {
    pub fn add(
        map: &mut IndexMap<String, DictionaryItemContent>,
        data: String,
        book_id: i32,
    ) -> Result<usize, Error> {
        let map_entry = map.get_full_mut(data.as_str());
        if map_entry.is_none() {
            let result = map.insert_full(
                data,
                DictionaryItemContent {
                    book_links: vec![book_id as usize],
                },
            );
            return Ok(result.0);
        }
        match map_entry {
            Some(data) => {
                data.2.book_links.push(book_id as usize);
                return Ok(data.0);
            }
            None => {
                return Err(Error::InvalidRdf("Book links".to_string()));
            }
        }
    }

    pub fn add_file(&mut self, data: String, book_id: i32) -> Result<usize, Error> {
        ParseResult::add(&mut self.files_dictionary, data, book_id)
    }

    pub fn add_file_type(&mut self, data: String, book_id: i32) -> Result<usize, Error> {
        ParseResult::add(&mut self.file_types_dictionary, data, book_id)
    }

    pub fn add_field(
        &mut self,
        field: ParseType,
        data: String,
        book_id: i32,
    ) -> Result<usize, Error> {
        ParseResult::add(&mut self.field_dictionaries[field as usize], data, book_id)
    }
}
pub trait FSTParser {
    fn text(
        &mut self,
        text: &str,
        parse_result: &mut ParseResult,
        book_id: i32,
    ) -> Result<(), Error>;
    fn reset(&mut self);
    fn start_node(&mut self, text: &str);
    fn attribute(
        &mut self,
        attribute_name: &str,
        attribute_value: &str,
        parse_result: &mut ParseResult,
        book_id: i32,
    ) -> Result<(), Error>;
    fn end_node(&mut self, node_name: &str);
    fn is_found(&self) -> bool;
    fn has_results(&self) -> bool;
    fn get_parse_type(&self) -> ParseType;
    fn get_result(&self) -> Result<&ParseItemResult, Error>;
    fn get_files(&self) -> Result<Vec<GutenbergFileEntry>, Error>;
}