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Cleanup parsers

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This commit is contained in:
BasioMeusPuga
2019-02-10 09:03:12 +05:30
parent c6e30b67ad
commit f6f9d01060
8 changed files with 271 additions and 316 deletions
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149
lector/readers/read_epub.py
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@@ -37,32 +37,17 @@ class EPUB:
def __init__(self, book_filename, temp_dir):
self.book_filename = book_filename
self.temp_dir = temp_dir
self.zip_file = None
self.file_list = None
self.opf_dict = None
self.book = {}
self.split_chapters = {}
self.metadata = None
self.content = []
self.generate_references()
def find_file(self, filename):
# Get rid of special characters
filename = unquote(filename)
# First, look for the file in the root of the book
if filename in self.file_list:
return filename
# Then search for it elsewhere
else:
file_basename = os.path.basename(filename)
for i in self.file_list:
if os.path.basename(i) == file_basename:
return i
# If the file isn't found
logging.error(filename + ' not found in ' + self.book_filename)
return False
def generate_references(self):
self.zip_file = zipfile.ZipFile(
self.book_filename, mode='r', allowZip64=True)
@@ -88,9 +73,26 @@ class EPUB:
packagefile_data = self.zip_file.read(packagefile)
self.opf_dict = xmltodict.parse(packagefile_data)
def generate_toc(self):
self.book['content'] = []
def find_file(self, filename):
# Get rid of special characters
filename = unquote(filename)
# First, look for the file in the root of the book
if filename in self.file_list:
return filename
# Then search for it elsewhere
else:
file_basename = os.path.basename(filename)
for i in self.file_list:
if os.path.basename(i) == file_basename:
return i
# If the file isn't found
logging.error(filename + ' not found in ' + self.book_filename)
return False
def generate_toc(self):
def find_alternative_toc():
toc_filename = None
toc_filename_alternative = None
@@ -134,14 +136,14 @@ class EPUB:
level + 1,
i['navLabel']['text'],
i['content']['@src']] for i in nav_node]
self.book['content'].extend(these_contents)
self.content.extend(these_contents)
return
if 'navPoint' in nav_node.keys():
recursor(level, nav_node['navPoint'])
else:
self.book['content'].append([
self.content.append([
level + 1,
nav_node['navLabel']['text'],
nav_node['content']['@src']])
@@ -150,14 +152,14 @@ class EPUB:
for top_level_nav in navpoints:
# Just one chapter
if isinstance(top_level_nav, str):
self.book['content'].append([
self.content.append([
1,
navpoints['navLabel']['text'],
navpoints['content']['@src']])
break
# Multiple chapters
self.book['content'].append([
self.content.append([
1,
top_level_nav['navLabel']['text'],
top_level_nav['content']['@src']])
@@ -183,14 +185,12 @@ class EPUB:
return 'Possible parse error: ' + chapter_file
def parse_split_chapters(self, chapters_with_split_content):
self.book['split_chapters'] = {}
# For split chapters, get the whole chapter first, then split
# between ids using their anchors, then "heal" the resultant text
# by creating a BeautifulSoup object. Write its str to the content
for i in chapters_with_split_content.items():
chapter_file = i[0]
self.book['split_chapters'][chapter_file] = {}
self.split_chapters[chapter_file] = {}
chapter_content = self.get_chapter_content(chapter_file)
soup = BeautifulSoup(chapter_content, 'lxml')
@@ -208,10 +208,10 @@ class EPUB:
if this_tag:
this_markup = BeautifulSoup(
str(this_tag).strip() + markup_split[1], 'lxml')
self.book['split_chapters'][chapter_file][this_anchor] = str(this_markup)
self.split_chapters[chapter_file][this_anchor] = str(this_markup)
# Remaining markup is assigned here
self.book['split_chapters'][chapter_file]['top_level'] = str(soup)
self.split_chapters[chapter_file]['top_level'] = str(soup)
def generate_content(self):
# Find all the chapters mentioned in the opf spine
@@ -238,7 +238,7 @@ class EPUB:
chapter_title = 1
toc_chapters = [
unquote(i[2].split('#')[0]) for i in self.book['content']]
unquote(i[2].split('#')[0]) for i in self.content]
last_valid_index = -2 # Yes, but why?
for i in spine_final:
@@ -251,7 +251,7 @@ class EPUB:
except ValueError:
last_valid_index += 1
self.book['content'].insert(
self.content.insert(
last_valid_index + 1,
[1, str(chapter_title), i])
chapter_title += 1
@@ -259,7 +259,7 @@ class EPUB:
# Parse split chapters as below
# They can be picked up during the iteration through the toc
chapters_with_split_content = {}
for i in self.book['content']:
for i in self.content:
if '#' in i[2]:
this_split = i[2].split('#')
chapter = this_split[0]
@@ -278,8 +278,7 @@ class EPUB:
# In case a split chapter is encountered, get its content
# from the split_chapters dictionary
# What could possibly go wrong?
split_chapters = self.book['split_chapters']
toc_copy = self.book['content'][:]
toc_copy = self.content[:]
# Put the book into the book
for count, i in enumerate(toc_copy):
@@ -293,7 +292,7 @@ class EPUB:
try:
chapter_content = (
split_chapters[chapter_file_proper][this_anchor])
self.split_chapters[chapter_file_proper][this_anchor])
except KeyError:
chapter_content = 'Parse Error'
error_string = (
@@ -301,9 +300,9 @@ class EPUB:
logger.error(error_string)
# Get content that remained at the end of the pillaging above
elif chapter_file in split_chapters.keys():
elif chapter_file in self.split_chapters.keys():
try:
chapter_content = split_chapters[chapter_file]['top_level']
chapter_content = self.split_chapters[chapter_file]['top_level']
except KeyError:
chapter_content = 'Parse Error'
error_string = (
@@ -314,26 +313,26 @@ class EPUB:
else:
chapter_content = self.get_chapter_content(chapter_file)
self.book['content'][count][2] = chapter_content
self.content[count][2] = chapter_content
# Cleanup content by removing null chapters
self.book['content'] = [
i for i in self.book['content'] if i[2]]
self.content = [
i for i in self.content if i[2]]
self.generate_book_cover()
if self.book['cover']:
cover_image = self.generate_book_cover()
if cover_image:
cover_path = os.path.join(
self.temp_dir, os.path.basename(self.book_filename)) + '- cover'
with open(cover_path, 'wb') as cover_temp:
cover_temp.write(self.book['cover'])
cover_temp.write(cover_image)
# There's probably some rationale to doing an insert here
# But a replacement seems... neater
self.book['content'].insert(
self.content.insert(
0, (1, 'Cover', f'<center><img src="{cover_path}" alt="Cover"></center>'))
def generate_metadata(self):
metadata = self.opf_dict['package']['metadata']
book_metadata = self.opf_dict['package']['metadata']
def flattener(this_object):
if isinstance(this_object, collections.OrderedDict):
@@ -354,67 +353,76 @@ class EPUB:
# Book title
try:
self.book['title'] = flattener(metadata['dc:title'])
title = flattener(book_metadata['dc:title'])
except:
self.book['title'] = os.path.splitext(
logger.warning('Title not found: ' + self.book_filename)
title = os.path.splitext(
os.path.basename(self.book_filename))[0]
# Book author
try:
self.book['author'] = flattener(metadata['dc:creator'])
author = flattener(book_metadata['dc:creator'])
except:
self.book['author'] = 'Unknown'
logger.warning('Author not found: ' + self.book_filename)
author = 'Unknown'
# Book year
try:
self.book['year'] = int(flattener(metadata['dc:date'])[:4])
year = int(flattener(book_metadata['dc:date'])[:4])
except:
self.book['year'] = 9999
logger.warning('Year not found: ' + self.book_filename)
year = 9999
# Book isbn
# Both one and multiple schema
self.book['isbn'] = None
isbn = None
try:
scheme = metadata['dc:identifier']['@opf:scheme'].lower()
scheme = book_metadata['dc:identifier']['@opf:scheme'].lower()
if scheme.lower() == 'isbn':
self.book['isbn'] = metadata['dc:identifier']['#text']
isbn = book_metadata['dc:identifier']['#text']
except (TypeError, KeyError):
try:
for i in metadata['dc:identifier']:
for i in book_metadata['dc:identifier']:
if i['@opf:scheme'].lower() == 'isbn':
self.book['isbn'] = i['#text']
isbn = i['#text']
break
except:
logger.warning('ISBN not found: ' + self.book_filename)
pass
# Book tags
try:
self.book['tags'] = metadata['dc:subject']
if isinstance(self.book['tags'], str):
self.book['tags'] = [self.book['tags']]
tags = book_metadata['dc:subject']
if isinstance(tags, str):
tags = [tags]
except:
self.book['tags'] = []
tags = []
# Book cover
self.generate_book_cover()
cover = self.generate_book_cover()
# Named tuple? Named tuple.
Metadata = collections.namedtuple(
'Metadata', ['title', 'author', 'year', 'isbn', 'tags', 'cover'])
self.metadata = Metadata(title, author, year, isbn, tags, cover)
def generate_book_cover(self):
# This is separate because the book cover needs to
# be found and extracted both during addition / reading
self.book['cover'] = None
book_cover = None
try:
cover_image = [
i['@href'] for i in self.opf_dict['package']['manifest']['item']
if i['@media-type'].split('/')[0] == 'image' and
'cover' in i['@id']][0]
self.book['cover'] = self.zip_file.read(
self.find_file(cover_image))
book_cover = self.zip_file.read(self.find_file(cover_image))
except:
pass
# Find book cover the hard way
if not self.book['cover']:
if not book_cover:
biggest_image_size = 0
biggest_image = None
for j in self.zip_file.filelist:
@@ -424,5 +432,10 @@ class EPUB:
biggest_image_size = j.file_size
if biggest_image:
self.book['cover'] = self.zip_file.read(
book_cover = self.zip_file.read(
self.find_file(biggest_image))
if not book_cover:
logger.warning('Cover not found: ' + self.book_filename)
return book_cover