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TXT Input: Strip out illegal chars from txt files. Fixes #6335 (does not convert)

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Kovid Goyal 2010-08-06 11:03:49 -06:00
parent f0a74e0ca9
commit b96c8576e5
1 changed files with 24 additions and 14 deletions
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38
src/calibre/ebooks/txt/processor.py
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@ -4,10 +4,9 @@
Read content from txt file.
'''
import os
import re
import os, re
from calibre import prepare_string_for_xml
from calibre import prepare_string_for_xml, isbytestring
from calibre.ebooks.markdown import markdown
from calibre.ebooks.metadata.opf2 import OPFCreator
@ -18,6 +17,8 @@ __docformat__ = 'restructuredtext en'
HTML_TEMPLATE = u'<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/><title>%s</title></head><body>\n%s\n</body></html>'
def convert_basic(txt, title='', epub_split_size_kb=0):
if isbytestring(txt):
txt = txt.decode('utf-8', 'replace')
# Strip whitespace from the beginning and end of the line. Also replace
# all line breaks with \n.
txt = '\n'.join([line.strip() for line in txt.splitlines()])
@ -30,23 +31,32 @@ def convert_basic(txt, title='', epub_split_size_kb=0):
txt = re.sub('(?<=.)\s+$', '', txt)
# Remove excessive line breaks.
txt = re.sub('\n{3,}', '\n\n', txt)
#remove ASCII invalid chars : 0 to 8 and 11-14 to 24
chars = list(range(8)) + [0x0B, 0x0E, 0x0F] + list(range(0x10, 0x19))
illegal_chars = re.compile(u'|'.join(map(unichr, chars)))
txt = illegal_chars.sub('', txt)
#Takes care if there is no point to split
if epub_split_size_kb > 0:
length_byte = len(txt.encode('utf-8'))
if isinstance(txt, unicode):
txt = txt.encode('utf-8')
length_byte = len(txt)
#Calculating the average chunk value for easy splitting as EPUB (+2 as a safe margin)
chunk_size = long(length_byte / (int(length_byte / (epub_split_size_kb * 1024) ) + 2 ))
#if there are chunks with a superior size then go and break
if (len(filter(lambda x: len(x.encode('utf-8')) > chunk_size, txt.split('\n\n')))) :
txt = u'\n\n'.join([split_string_separator(line, chunk_size) for line in txt.split('\n\n')])
if (len(filter(lambda x: len(x) > chunk_size, txt.split('\n\n')))) :
txt = '\n\n'.join([split_string_separator(line, chunk_size)
for line in txt.split('\n\n')])
if isbytestring(txt):
txt = txt.decode('utf-8')
lines = []
# Split into paragraphs based on having a blank line between text.
for line in txt.split('\n\n'):
if line.strip():
lines.append('<p>%s</p>' % prepare_string_for_xml(line.replace('\n', ' ')))
lines.append(u'<p>%s</p>' % prepare_string_for_xml(line.replace('\n', ' ')))
return HTML_TEMPLATE % (title, '\n'.join(lines))
return HTML_TEMPLATE % (title, u'\n'.join(lines))
def convert_markdown(txt, title='', disable_toc=False):
md = markdown.Markdown(
@ -58,11 +68,11 @@ def convert_markdown(txt, title='', disable_toc=False):
def separate_paragraphs_single_line(txt):
txt = txt.replace('\r\n', '\n')
txt = txt.replace('\r', '\n')
txt = re.sub(u'(?<=.)\n(?=.)', u'\n\n', txt)
txt = re.sub(u'(?<=.)\n(?=.)', '\n\n', txt)
return txt
def separate_paragraphs_print_formatted(txt):
txt = re.sub('(?miu)^(\t+|[ ]{2,})(?=.)', '\n\t', txt)
txt = re.sub(u'(?miu)^(\t+|[ ]{2,})(?=.)', '\n\t', txt)
return txt
def preserve_spaces(txt):
@ -78,9 +88,9 @@ def opf_writer(path, opf_name, manifest, spine, mi):
opf.render(opffile)
def split_string_separator(txt, size) :
if len(txt.encode('utf-8')) > size:
txt = u''.join([re.sub(u'\.(?P<ends>[^.]*)$', u'.\n\n\g<ends>',
if len(txt) > size:
txt = ''.join([re.sub(u'\.(?P<ends>[^.]*)$', '.\n\n\g<ends>',
txt[i:i+size], 1) for i in
xrange(0, len(txt.encode('utf-8')), size)])
xrange(0, len(txt), size)])
return txt