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import re
import time
from mitmproxy.contentviews import base
from mitmproxy.utils import strutils
"""
A custom CSS prettifier. Compared to other prettifiers, its main features are:
- Implemented in pure Python.
- Modifies whitespace only.
- Works with any input.
- Considerably faster than e.g. cssutils.
"""
CSS_SPECIAL_AREAS = (
"'" + strutils.SINGLELINE_CONTENT + strutils.NO_ESCAPE + "'",
'"' + strutils.SINGLELINE_CONTENT + strutils.NO_ESCAPE + '"',
r"/\*" + strutils.MULTILINE_CONTENT + r"\*/",
"//" + strutils.SINGLELINE_CONTENT + "$"
)
CSS_SPECIAL_CHARS = "{};:"
def beautify(data: str, indent: str = " "):
"""Beautify a string containing CSS code"""
data = strutils.escape_special_areas(
data.strip(),
CSS_SPECIAL_AREAS,
CSS_SPECIAL_CHARS,
)
# Add newlines
data = re.sub(r"\s*;\s*", ";\n", data)
data = re.sub(r"\s*{\s*", " {\n", data)
data = re.sub(r"\s*}\s*", "\n}\n\n", data)
# Fix incorrect ":" placement
data = re.sub(r"\s*:\s*(?=[^{]+})", ": ", data)
# Fix no space after ","
data = re.sub(r"\s*,\s*", ", ", data)
# indent
data = re.sub("\n[ \t]+", "\n", data)
data = re.sub("\n(?![}\n])(?=[^{]*})", "\n" + indent, data)
data = strutils.unescape_special_areas(data)
return data.rstrip("\n") + "\n"
class ViewCSS(base.View):
name = "CSS"
content_types = [
"text/css"
]
def __call__(self, data, **metadata):
data = data.decode("utf8", "surrogateescape")
beautified = beautify(data)
return "CSS", base.format_text(beautified)
if __name__ == "__main__": # pragma: no cover
with open("../tools/web/static/vendor.css") as f:
data = f.read()
t = time.time()
x = beautify(data)
print("Beautifying vendor.css took {:.2}s".format(time.time() - t))
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