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Improve CSS embedding

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This commit is contained in:
Adrian Vollmer 2022-10-12 13:42:05 +02:00
parent d5b30f9f52
commit e05de76bad
1 changed files with 17 additions and 3 deletions
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20
zundler/embed.py
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@ -202,10 +202,24 @@ def to_data_uri(filename, mime_type=None):
def embed_css_resources(css, filename): def embed_css_resources(css, filename):
"""Replace url(<path>) with url(data:<mime_type>;base64, ...)""" """Replace url(<path>) with url(data:<mime_type>;base64, ...)
# This uses some heuristics which could technically fail
Also, handle @import."""
# This uses some heuristics which will fail in general.
# Eventually a library like tinycss2 might be preferable.
import re import re
# First, make sure all @import's are using url(), because these are both valid:
# @import url("foo.css");
# @import "foo.css";
regex = rb'''(?P<rule>@import\s*['"]?(?P<url>.*?)['"]?\s*;)'''
replace_rules = {}
for m in re.finditer(regex, css, flags=re.IGNORECASE):
if not m['url'].lower().startswith(b'url('):
replace_rules[m['rule']] = b"@import url('%s');" % m['url']
for orig, new in replace_rules.items():
css = css.replace(orig, new)
# Quotes are optional. But then URLs can contain escaped characters. # Quotes are optional. But then URLs can contain escaped characters.
regex = ( regex = (
rb'''(?P<url_statement>url\(['"]?(?P<url>.*?)['"]?\))''' rb'''(?P<url_statement>url\(['"]?(?P<url>.*?)['"]?\))'''
@ -214,7 +228,7 @@ def embed_css_resources(css, filename):
replace_rules = {} replace_rules = {}
for m in re.finditer(regex, css): for m in re.finditer(regex, css, flags=re.IGNORECASE):
if re.match(b'''['"]?data:.*''', m['url']): if re.match(b'''['"]?data:.*''', m['url']):
continue continue