forked from LiveCarta/BookConverter
576 lines
25 KiB
Python
576 lines
25 KiB
Python
import re
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import json
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import codecs
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import os
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from os.path import dirname, normpath, join
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from itertools import chain
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from collections import defaultdict
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from typing import Dict, Union, List
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import ebooklib
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from ebooklib import epub
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from ebooklib.epub import Link, Section
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from bs4 import BeautifulSoup, Tag
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from src.util.helpers import BookLogger
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from src.livecarta_config import LiveCartaConfig
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from src.data_objects import ChapterItem, NavPoint
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from src.epub_converter.css_preprocessing import build_inline_style_content, build_css_file_content
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from src.epub_converter.tag_css_style_converter import convert_html_soup_with_css_style
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from src.epub_converter.html_epub_preprocessor import unwrap_structural_tags, get_tags_between_chapter_marks,\
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prepare_title, prepare_content, update_images_src_links, preprocess_footnotes
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class EpubConverter:
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def __init__(self, file_path, access=None, logger=None):
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self.file_path = file_path
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self.access = access
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self.logger: BookLogger = logger
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self.ebooklib_book = epub.read_epub(file_path)
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# main container for all epub .xhtml files
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self.html_href2html_body_soup: Dict[str, BeautifulSoup] = {}
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# enumerate all subchapter id for each file
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self.html_href2subchapter_ids = defaultdict(list)
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self.hrefs_added_to_toc = set() # enumerate all file paths that where added to TOC
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# toc tree structure stored as adj.list (NavPoint to list of NavPoints)
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# key = -1 for top level NavPoints
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self.adjacency_list: Dict[Union[NavPoint, -1], Union[list, None]] = {}
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# list to offset Chapter_i on 1st level
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self.offset_sub_nodes = []
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# container for all chapters soup objects
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# here soup object is only part of the .xhtml file
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self.href_chapter_id2soup_html: Dict[tuple, BeautifulSoup] = {}
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self.internal_anchors = set()
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# flag to be updated while ebooklib.toc is parsed
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self.id_anchor_exist_in_nav_points = False
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self.img_href2img_bytes = {} # file path to bytes
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# file path from <a> to generated aws path
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self.book_image_src_path2aws_path = {}
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self.footnotes_contents: List[str] = [] # to be sent on server as is
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self.noterefs: List[Tag] = [] # start of the footnote
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self.footnotes: List[Tag] = [] # end of the footnote
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self.logger.log('Image processing.')
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for x in chain(self.ebooklib_book.get_items_of_type(ebooklib.ITEM_IMAGE),
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self.ebooklib_book.get_items_of_type(ebooklib.ITEM_COVER)):
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file_name = x.file_name
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content = x.content
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self.img_href2img_bytes[file_name] = content
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self.logger.log('HTML files reading.')
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self.html_href2html_body_soup: Dict[str,
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BeautifulSoup] = self.build_href2soup_content()
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# TODO Presets
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self.logger.log('Process CSS inline styles.')
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self.process_inline_styles_in_html_soup()
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self.logger.log('CSS files processing.')
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self.html_href2css_href, self.css_href2css_content = self.build_html_and_css_relations()
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self.logger.log('CSS styles adding.')
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self.add_css_styles_to_html_soup()
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self.logger.log('Footnotes processing.')
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for href in self.html_href2html_body_soup:
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content, noterefs, footnotes_tags = preprocess_footnotes(self.html_href2html_body_soup[href],
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self.html_href2html_body_soup)
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self.footnotes_contents.extend(content)
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self.noterefs.extend(noterefs)
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self.footnotes.extend(footnotes_tags)
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for i, (noteref, footnote) in enumerate(zip(self.noterefs, self.footnotes)):
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noteref.attrs['data-id'] = i + 1
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noteref.attrs['id'] = f'footnote-{i + 1}'
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footnote.attrs['href'] = f'#footnote-{i + 1}'
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self.logger.log(f'Added {len(self.footnotes_contents)} footnotes.')
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self.logger.log('TOC processing.')
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self.build_adjacency_list_from_toc(self.ebooklib_book.toc)
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# build simple toc from spine if needed
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if self.is_toc_empty():
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self.build_adjacency_list_from_spine()
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not_added = [
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x for x in self.html_href2html_body_soup if x not in self.hrefs_added_to_toc]
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self.logger.log(f'Html documents not added to TOC: {not_added}.')
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self.add_not_added_files_to_adjacency_list(not_added)
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self.logger.log(f'Html internal links and structure processing.')
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self.label_chapters_ids_with_tmp_id()
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# used only after parsed toc, ids from toc needed
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self.process_html_soup_structure_to_line()
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self.process_internal_links()
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self.logger.log(f'Building chapters content.')
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self.define_chapters_content()
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def build_href2soup_content(self) -> Dict[str, BeautifulSoup]:
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# using EpubElements
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# for now just for HTML objects, as it is the simplest chapter
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nodes = dict()
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for item in self.ebooklib_book.get_items_of_type(ebooklib.ITEM_DOCUMENT):
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html_body_text = item.get_body_content()
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# html.parser closes tags if needed
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soup = BeautifulSoup(html_body_text, features='html.parser')
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nodes[item.file_name] = soup
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return nodes
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def get_css_content(self, css_href, html_href):
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path_to_css_from_html = css_href
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html_folder = dirname(html_href)
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path_to_css_from_root = normpath(
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join(html_folder, path_to_css_from_html)).replace('\\', '/')
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css_obj = self.ebooklib_book.get_item_with_href(path_to_css_from_root)
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# if in css file we import another css
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if "@import" in str(css_obj.content):
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path_to_css_from_root = "css/" + \
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re.search('"(.*)"', str(css_obj.content)).group(1)
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css_obj = self.ebooklib_book.get_item_with_href(
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path_to_css_from_root)
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assert css_obj, f'Css style {css_href} was not in manifest.'
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css_content: str = css_obj.get_content().decode()
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return css_content
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def process_inline_styles_in_html_soup(self):
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"""This function is designed to convert inline html styles"""
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for html_href in self.html_href2html_body_soup:
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html_content: BeautifulSoup = self.html_href2html_body_soup[html_href]
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tags_with_inline_style = html_content.find_all(LiveCartaConfig.could_have_style_in_livecarta_regexp,
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attrs={'style': re.compile('.*')})
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for tag_initial_inline_style in tags_with_inline_style:
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inline_style = tag_initial_inline_style.attrs['style']
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tag_initial_inline_style.attrs['style'] = \
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build_inline_style_content(inline_style)
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def build_html_and_css_relations(self) -> tuple[dict, dict]:
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"""
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Function is designed to get 2 dictionaries:
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The first is html_href2css_href. It is created to connect href of html to css files(hrefs of them
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) which are used on this html
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The second is css_href2css_content. It is created to connect href of css to content of css
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...2... = key2value
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Returns
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----------
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html_href2css_href, css_href2css_content: tuple[dict, dict]
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dictionary: href of html to related css files, dictionary: css files to related css content
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"""
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# dictionary: href of html to related css files
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html_href2css_href: defaultdict = defaultdict(list)
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css_href2css_content: dict = {}
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for item in self.ebooklib_book.get_items_of_type(ebooklib.ITEM_DOCUMENT):
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html_content = item.content
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html_href = item.file_name
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soup_html_content = BeautifulSoup(html_content, features='lxml')
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# check if file links to css file
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for tag in soup_html_content.find_all('link', attrs={"type": "text/css"}):
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# alternate page of original page (e.g. another language)
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if tag.attrs.get('rel') and ('alternate' in tag.attrs['rel']):
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continue
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css_href = tag.attrs.get('href')
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html_href2css_href[html_href].append(css_href)
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if css_href not in css_href2css_content:
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# css_href not in css_href2css_content, add to this dict
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css_href2css_content[css_href] = build_css_file_content(
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self.get_css_content(css_href, html_href))
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for i, tag in enumerate(soup_html_content.find_all('style')):
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css_content = tag.string
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html_href2css_href[html_href].append(f'href{i}')
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css_href2css_content[f'href{i}'] = build_css_file_content(
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css_content)
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return html_href2css_href, css_href2css_content
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def add_css_styles_to_html_soup(self):
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"""
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This function is designed to update html_href2html_body_soup
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- add to html_inline_style css_style_content
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"""
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for html_href in self.html_href2html_body_soup:
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if self.html_href2css_href.get(html_href):
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css = ''
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for css_href in self.html_href2css_href[html_href]:
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css += self.css_href2css_content[css_href]
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html_content: BeautifulSoup = self.html_href2html_body_soup[html_href]
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html_content = convert_html_soup_with_css_style(html_content, css)
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self.html_href2html_body_soup[html_href] = html_content
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def build_adjacency_list_from_toc(self, element: [Link, tuple, list], lvl=0):
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"""
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Function
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self.adjacency_list builds based on TOC nested structure, got from self.ebooklib.toc
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key = -1 if root(top chapters),
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value = None if leaf(the least chapters)
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Parameters
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----------
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element: [Link, tuple, list]
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element that appears in TOC(usually parsed from nav.ncx)
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lvl: int
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level of node
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Returns
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----------
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None
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built adjacency list
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"""
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if isinstance(element, Link):
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nav_point = NavPoint(element)
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if nav_point.id:
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self.id_anchor_exist_in_nav_points = True
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self.html_href2subchapter_ids[nav_point.href].append(
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nav_point.id)
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self.adjacency_list[nav_point] = None
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self.hrefs_added_to_toc.add(nav_point.href)
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return nav_point
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elif isinstance(element, tuple):
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first, second = element
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assert isinstance(first, Section)
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nav_point = NavPoint(first)
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if nav_point.id:
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self.id_anchor_exist_in_nav_points = True
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self.html_href2subchapter_ids[nav_point.href].append(
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nav_point.id)
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sub_nodes = []
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for elem in second:
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if ('section' in first.title.lower() or 'part' in first.title.lower()) and lvl == 1:
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self.offset_sub_nodes.append(
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self.build_adjacency_list_from_toc(elem, lvl))
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else:
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sub_nodes.append(
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self.build_adjacency_list_from_toc(elem, lvl + 1))
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self.adjacency_list[nav_point] = sub_nodes
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self.hrefs_added_to_toc.add(nav_point.href)
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return nav_point
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elif isinstance(element, list) and (lvl == 0):
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nodes = []
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# add through every element
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for elem in element:
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nodes.append(
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self.build_adjacency_list_from_toc(elem, lvl + 1))
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# set chapter_i after Section & add through every offset sub element
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for offset_sub_node in self.offset_sub_nodes:
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nodes.append(offset_sub_node)
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self.offset_sub_nodes = []
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self.adjacency_list[-1] = nodes
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else:
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assert 0, f'Error. Element is not tuple/Link/list instance: {type(element)}'
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def is_toc_empty(self) -> bool:
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"""Function checks is toc empty"""
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# there is no toc in ebook or no top chapters
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if (self.ebooklib_book.toc is None) or (self.adjacency_list.get(-1) is None):
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return True
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return False
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def build_manifest_id2html_href(self) -> dict:
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links = dict()
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for item in self.ebooklib_book.get_items_of_type(ebooklib.ITEM_DOCUMENT):
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links[item.id] = item.file_name
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return links
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def build_adjacency_list_from_spine(self):
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manifest_id2html_href = self.build_manifest_id2html_href()
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self.adjacency_list = {
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-1: []
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}
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for id_, _ in self.ebooklib_book.spine:
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nav_point = NavPoint(
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Section(manifest_id2html_href[id_], manifest_id2html_href[id_]))
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self.adjacency_list[-1].append(nav_point)
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self.hrefs_added_to_toc.add(nav_point.href)
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def add_not_added_files_to_adjacency_list(self, not_added):
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"""Function add files that not added to adjacency list"""
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for i, file in enumerate(not_added):
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nav_point = NavPoint(
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Section(f'To check #{i}, filename: {file}', file))
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self.adjacency_list[-1].append(nav_point)
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self.hrefs_added_to_toc.add(file)
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def label_chapters_ids_with_tmp_id(self):
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for html_href in self.html_href2html_body_soup:
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ids = self.html_href2subchapter_ids[html_href]
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for i in ids:
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soup = self.html_href2html_body_soup[html_href]
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tag = soup.find(id=i)
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new_h = soup.new_tag('tmp')
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new_h.attrs['class'] = 'converter-chapter-mark'
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new_h.attrs['id'] = i
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tag.insert_before(new_h)
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def process_html_soup_structure_to_line(self):
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# go to line structure
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for html_href in self.html_href2html_body_soup:
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soup = self.html_href2html_body_soup[html_href]
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self.html_href2html_body_soup[html_href] = unwrap_structural_tags(soup)
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@staticmethod
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def create_unique_id(href, id_):
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return re.sub(r'([^\w\s])|_|-', '', href) + re.sub(r'[_-]', '0', id_)
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@staticmethod
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def create_new_anchor_span(soup, id_):
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new_anchor_span = soup.new_tag("span")
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new_anchor_span.attrs['id'] = id_
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new_anchor_span.attrs['class'] = 'link-anchor'
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new_anchor_span.string = "\xa0"
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return new_anchor_span
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def match_href_to_path_from_toc(self, cur_file_path: str, href_in_link: str, internal_link_tag: Tag) -> [None, str]:
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"""
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Function used to find full path to file that is parsed from tag link
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TOC: a/b/c.xhtml
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b/c.xhtml -> a/b/c.xhtml
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c.xhtml -> a/b/c.xhtml
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Parameters
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----------
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cur_file_path: str
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path to current file with tag link
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href_in_link: str
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filename got from tag link, like file1.xhtml
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internal_link_tag: Tag
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object that is parsed now
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Returns
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-------
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full_path[0]: str
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prepared content
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"""
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dir_name = os.path.dirname(cur_file_path)
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normed_path = os.path.normpath(os.path.join(
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dir_name, href_in_link)).replace('\\', '/')
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full_path = [
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path for path in self.hrefs_added_to_toc if normed_path in path]
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if not full_path:
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self.logger.log(f'Error in {cur_file_path} file. No {normed_path} file found in added to TOC documents. '
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f'While processing href in {internal_link_tag}.')
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internal_link_tag.attrs['converter-mark'] = 'bad-link'
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return None
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if len(full_path) > 1:
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self.logger.log(f'Warning in {cur_file_path}. Multiple paths found {full_path} for file {href_in_link}'
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f' while {internal_link_tag} processing. The first one will be chosen.')
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return full_path[0]
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def process_internal_links(self):
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"""
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Function
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- processing internal links in a book
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- make ids unique
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Steps
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----------
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1. rebuild ids to be unique in all documents
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2a. process anchor which is a whole xhtml file
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2b. process anchor which is an element in xhtml file
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Returns
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-------
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None
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process links in html
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"""
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# 1. rebuild ids to be unique in all documents
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for toc_href in self.hrefs_added_to_toc:
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for tag in self.html_href2html_body_soup[toc_href].find_all(attrs={'id': re.compile(r'.+')}):
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if tag.attrs.get('class') == 'converter-chapter-mark':
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continue
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if tag.attrs.get('class') == 'footnote-element':
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continue
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new_id = self.create_unique_id(toc_href, tag.attrs['id'])
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tag.attrs['id'] = new_id
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# 2a. process anchor which is a whole xhtml file
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internal_link_reg1 = re.compile(
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r'(^(?!https?://).+\.(htm|html|xhtml)$)')
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for toc_href in self.hrefs_added_to_toc:
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soup = self.html_href2html_body_soup[toc_href]
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for internal_link_tag in soup.find_all('a', {'href': internal_link_reg1}):
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a_tag_href = internal_link_tag.attrs['href']
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# find full path
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a_tag_href_matched_to_toc = self.match_href_to_path_from_toc(
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toc_href, a_tag_href, internal_link_tag)
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if not a_tag_href_matched_to_toc:
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continue
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new_id = self.create_unique_id(a_tag_href_matched_to_toc, '')
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internal_link_tag.attrs['placeholder'] = '{{tempStyleToAnchor-' + new_id + '}}'
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if new_id not in self.internal_anchors:
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anchor_soup = self.html_href2html_body_soup[a_tag_href_matched_to_toc]
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new_anchor_span = self.create_new_anchor_span(soup, new_id)
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# insert a new span to the beginning of the file
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anchor_soup.insert(0, new_anchor_span)
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self.internal_anchors.add(new_id)
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del internal_link_tag.attrs['href']
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# 2b. process anchor which is an element in xhtml file
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internal_link_reg2 = re.compile(r'(^.+\.(htm|html|xhtml)#.+)|(^#.+)')
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for toc_href in self.hrefs_added_to_toc:
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soup = self.html_href2html_body_soup[toc_href]
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for internal_link_tag in soup.find_all('a', {'href': internal_link_reg2}):
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a_tag_href, a_tag_id = internal_link_tag.attrs['href'].split(
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'#')
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# find full path
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|
if a_tag_href:
|
|
a_tag_href_matched_to_toc = self.match_href_to_path_from_toc(toc_href, a_tag_href,
|
|
internal_link_tag)
|
|
else:
|
|
a_tag_href_matched_to_toc = os.path.normpath(
|
|
toc_href).replace('\\', '/')
|
|
|
|
if not a_tag_href_matched_to_toc:
|
|
continue
|
|
|
|
new_id = self.create_unique_id(
|
|
a_tag_href_matched_to_toc, a_tag_id)
|
|
|
|
anchor_soup = self.html_href2html_body_soup[a_tag_href_matched_to_toc]
|
|
anchor_tags = anchor_soup.find_all(attrs={'id': new_id, })
|
|
anchor_tags = anchor_tags or anchor_soup.find_all(
|
|
attrs={'id': a_tag_id}) # if link is a footnote
|
|
|
|
if anchor_tags:
|
|
if len(anchor_tags) > 1:
|
|
self.logger.log(f'Warning in {toc_href}: multiple anchors: {len(anchor_tags)} found.\n'
|
|
f'{anchor_tags}\n'
|
|
f' While processing {internal_link_tag}')
|
|
|
|
anchor_tag = anchor_tags[0]
|
|
assert anchor_tag.attrs['id'] in [new_id, a_tag_id]
|
|
# if anchor is found we could add placeholder for link creation on server side.
|
|
internal_link_tag.attrs['placeholder'] = '{{tempStyleToAnchor-' + new_id + '}}'
|
|
# create span to have cyclic links, link has 1 type of class, anchor another
|
|
if anchor_tag.attrs['id'] not in self.internal_anchors:
|
|
new_anchor_span = self.create_new_anchor_span(
|
|
soup, new_id)
|
|
anchor_tag.insert_before(new_anchor_span)
|
|
self.internal_anchors.add(new_id)
|
|
del anchor_tag.attrs['id']
|
|
del internal_link_tag.attrs['href']
|
|
|
|
else:
|
|
internal_link_tag.attrs['converter-mark'] = 'bad-link'
|
|
self.logger.log(f'Error in {toc_href}. While processing {internal_link_tag} no anchor found.'
|
|
f' Should be anchor with new id={new_id} in {a_tag_href_matched_to_toc} file.'
|
|
f' Old id={a_tag_id}')
|
|
|
|
def build_one_chapter(self, nav_point: NavPoint):
|
|
"""
|
|
Function updates self.href_chapter_id2soup_html (mapping from (href,id) to chapter content/html soup object)
|
|
|
|
3 cases:
|
|
id wraps all chapter content,
|
|
id wraps chapter's content + subchapters' content
|
|
id points to the start of title of a chapter
|
|
|
|
In all cases we know where chapter starts. Therefore, chapter is all tags between chapter's id
|
|
and id of the next chapter/subchapter
|
|
Parameters
|
|
----------
|
|
nav_point: NavPoint
|
|
|
|
Returns
|
|
-------
|
|
None
|
|
built chapter
|
|
|
|
"""
|
|
if nav_point.id:
|
|
soup = self.html_href2html_body_soup[nav_point.href]
|
|
chapter_tags = get_tags_between_chapter_marks(
|
|
first_id=nav_point.id, href=nav_point.href, html_soup=soup)
|
|
new_tree = BeautifulSoup('', 'html.parser')
|
|
for tag in chapter_tags:
|
|
new_tree.append(tag)
|
|
self.href_chapter_id2soup_html[(
|
|
nav_point.href, nav_point.id)] = new_tree
|
|
|
|
if self.adjacency_list.get(nav_point):
|
|
for sub_node in self.adjacency_list[nav_point]:
|
|
self.build_one_chapter(sub_node)
|
|
|
|
def define_chapters_content(self):
|
|
"""Function build chapters content, starts from top level chapters"""
|
|
top_level_nav_points = self.adjacency_list[-1]
|
|
if self.id_anchor_exist_in_nav_points:
|
|
for point in top_level_nav_points:
|
|
self.build_one_chapter(point)
|
|
|
|
def node_to_livecarta_chapter_item(self, nav_point: NavPoint, lvl=1) -> ChapterItem:
|
|
title = nav_point.title
|
|
if nav_point.id:
|
|
content: BeautifulSoup = self.href_chapter_id2soup_html[(
|
|
nav_point.href, nav_point.id)]
|
|
else:
|
|
content: BeautifulSoup = self.html_href2html_body_soup[nav_point.href]
|
|
self.book_image_src_path2aws_path = update_images_src_links(content,
|
|
self.img_href2img_bytes,
|
|
path_to_html=nav_point.href,
|
|
access=self.access,
|
|
path2aws_path=self.book_image_src_path2aws_path,
|
|
book_id=self.file_path.stem
|
|
if hasattr(self.file_path, 'stem') else 'book_id')
|
|
|
|
is_chapter = lvl <= LiveCartaConfig.SUPPORTED_LEVELS
|
|
title_preprocessed = prepare_title(title)
|
|
content_preprocessed = prepare_content(title_preprocessed, content,
|
|
remove_title_from_chapter=is_chapter)
|
|
sub_nodes = []
|
|
# warning! not EpubHtmlItems won't be added to chapter
|
|
if self.adjacency_list.get(nav_point):
|
|
for sub_node in self.adjacency_list[nav_point]:
|
|
sub_chapter_item = self.node_to_livecarta_chapter_item(
|
|
sub_node, lvl + 1)
|
|
sub_nodes.append(sub_chapter_item)
|
|
|
|
if self.logger:
|
|
indent = ' ' * lvl
|
|
self.logger.log(f'{indent}Chapter: {title} is prepared.')
|
|
return ChapterItem(title_preprocessed, content_preprocessed, sub_nodes)
|
|
|
|
def convert_to_dict(self) -> dict:
|
|
"""Function which convert list of html nodes to appropriate json structure"""
|
|
top_level_nav_points = self.adjacency_list[-1]
|
|
top_level_chapters = []
|
|
|
|
for nav_point in top_level_nav_points:
|
|
chapter = self.node_to_livecarta_chapter_item(nav_point)
|
|
top_level_chapters.append(chapter)
|
|
top_level_dict_chapters = [x.to_dict() for x in top_level_chapters]
|
|
self.logger.log(f'Anchors found: {len(self.internal_anchors)}.')
|
|
self.logger.log('End conversion.')
|
|
|
|
return {
|
|
"content": top_level_dict_chapters,
|
|
"footnotes": self.footnotes_contents
|
|
}
|
|
|
|
|
|
if __name__ == "__main__":
|
|
epub_file_path = '../../epub/9781614382264.epub'
|
|
logger_object = BookLogger(
|
|
name='epub', book_id=epub_file_path.split('/')[-1])
|
|
|
|
json_converter = EpubConverter(epub_file_path, logger=logger_object)
|
|
content_dict = json_converter.convert_to_dict()
|
|
|
|
with codecs.open(epub_file_path.replace('epub', 'json'), 'w', encoding='utf-8') as f_json:
|
|
json.dump(content_dict, f_json, ensure_ascii=False)
|