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Compile HTML preproc regexps on demand rather than at import time

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Kovid Goyal 2019-10-19 10:51:27 +05:30
parent e5dc6b4002
commit 5e611db7db
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 25 additions and 13 deletions
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38
src/calibre/ebooks/conversion/preprocess.py
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@ -372,12 +372,13 @@ def accent_regex(accent_maps, letter_before=False):
return pat, sub
class HTMLPreProcessor(object):
PREPROCESS = [
def html_preprocess_rules():
ans = getattr(html_preprocess_rules, 'ans', None)
if ans is None:
ans = html_preprocess_rules.ans = [
# Remove huge block of contiguous spaces as they slow down
# the following regexes pretty badly
(re.compile(r'\s{10000,}'), lambda m: ''),
(re.compile(r'\s{10000,}'), ''),
# Some idiotic HTML generators (Frontpage I'm looking at you)
# Put all sorts of crap into <head>. This messes up lxml
(re.compile(r'<head[^>]*>\n*(.*?)\n*</head>', re.IGNORECASE|re.DOTALL),
@ -385,12 +386,15 @@ class HTMLPreProcessor(object):
# Convert all entities, since lxml doesn't handle them well
(re.compile(r'&(\S+?);'), convert_entities),
# Remove the <![if/endif tags inserted by everybody's darling, MS Word
(re.compile(r'</{0,1}!\[(end){0,1}if\]{0,1}>', re.IGNORECASE),
lambda match: ''),
(re.compile(r'</{0,1}!\[(end){0,1}if\]{0,1}>', re.IGNORECASE), ''),
]
return ans
# Fix pdftohtml markup
PDFTOHTML = [
def pdftohtml_rules():
ans = getattr(pdftohtml_rules, 'ans', None)
if ans is None:
ans = pdftohtml_rules.ans = [
accent_regex({
'¨': 'aAeEiIoOuU:äÄëËïÏöÖüÜ',
'`': 'aAeEiIoOuU:àÀèÈìÌòÒùÙ',
@ -428,9 +432,13 @@ class HTMLPreProcessor(object):
(re.compile(r'(?<!“)<i>'), ' <i>'),
(re.compile(r'</i>(?=\w)'), '</i> '),
]
return ans
# Fix Book Designer markup
BOOK_DESIGNER = [
def book_designer_rules():
ans = getattr(book_designer_rules, 'ans', None)
if ans is None:
ans = book_designer_rules.ans = [
# HR
(re.compile('<hr>', re.IGNORECASE),
lambda match : '<span style="page-break-after:always"> </span>'),
@ -444,6 +452,10 @@ class HTMLPreProcessor(object):
(re.compile('<span[^><]*?id=subtitle[^><]*?>(.*?)</span>', re.IGNORECASE|re.DOTALL),
lambda match : '<h3 class="subtitle">%s</h3>'%(match.group(1),)),
]
return None
class HTMLPreProcessor(object):
def __init__(self, log=None, extra_opts=None, regex_wizard_callback=None):
self.log = log
@ -470,9 +482,9 @@ class HTMLPreProcessor(object):
if self.is_baen(html):
rules = []
elif self.is_book_designer(html):
rules = self.BOOK_DESIGNER
rules = book_designer_rules()
elif is_pdftohtml:
rules = self.PDFTOHTML
rules = pdftohtml_rules()
else:
rules = []
@ -538,7 +550,7 @@ class HTMLPreProcessor(object):
r'\s*[\w\d$(])') % length, re.UNICODE), wrap_lines),
)
for rule in self.PREPROCESS + start_rules:
for rule in html_preprocess_rules() + start_rules:
html = rule[0].sub(rule[1], html)
if self.regex_wizard_callback is not None: