317 lines
12 KiB
Python
317 lines
12 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""CSS Minifier functions for CSS-HTML-JS-Minify."""
|
|
|
|
import re
|
|
import itertools
|
|
|
|
from .variables import EXTENDED_NAMED_COLORS, CSS_PROPS_TEXT
|
|
|
|
|
|
__all__ = ('css_minify', 'condense_semicolons')
|
|
|
|
|
|
def _compile_props(props_text, grouped=False):
|
|
"""Take a list of props and prepare them."""
|
|
props, prefixes = [], "-webkit-,-khtml-,-epub-,-moz-,-ms-,-o-,".split(",")
|
|
for propline in props_text.strip().lower().splitlines():
|
|
props += [pre + pro for pro in propline.split(" ") for pre in prefixes]
|
|
props = filter(lambda line: not line.startswith('#'), props)
|
|
if not grouped:
|
|
props = list(filter(None, props))
|
|
return props, [0]*len(props)
|
|
final_props, groups, g_id = [], [], 0
|
|
for prop in props:
|
|
if prop.strip():
|
|
final_props.append(prop)
|
|
groups.append(g_id)
|
|
else:
|
|
g_id += 1
|
|
return final_props, groups
|
|
|
|
|
|
def _prioritify(line_of_css, css_props_text_as_list):
|
|
"""Return args priority, priority is integer and smaller means higher."""
|
|
sorted_css_properties, groups_by_alphabetic_order = css_props_text_as_list
|
|
priority_integer, group_integer = 9999, 0
|
|
for css_property in sorted_css_properties:
|
|
if css_property.lower() == line_of_css.split(":")[0].lower().strip():
|
|
priority_integer = sorted_css_properties.index(css_property)
|
|
group_integer = groups_by_alphabetic_order[priority_integer]
|
|
break
|
|
return priority_integer, group_integer
|
|
|
|
|
|
def _props_grouper(props, pgs):
|
|
"""Return groups for properties."""
|
|
if not props:
|
|
return props
|
|
# props = sorted([
|
|
# _ if _.strip().endswith(";")
|
|
# and not _.strip().endswith("*/") and not _.strip().endswith("/*")
|
|
# else _.rstrip() + ";\n" for _ in props])
|
|
props_pg = zip(map(lambda prop: _prioritify(prop, pgs), props), props)
|
|
props_pg = sorted(props_pg, key=lambda item: item[0][1])
|
|
props_by_groups = map(
|
|
lambda item: list(item[1]),
|
|
itertools.groupby(props_pg, key=lambda item: item[0][1]))
|
|
props_by_groups = map(lambda item: sorted(
|
|
item, key=lambda item: item[0][0]), props_by_groups)
|
|
props = []
|
|
for group in props_by_groups:
|
|
group = map(lambda item: item[1], group)
|
|
props += group
|
|
props += ['\n']
|
|
props.pop()
|
|
return props
|
|
|
|
|
|
def sort_properties(css_unsorted_string):
|
|
"""CSS Property Sorter Function.
|
|
|
|
This function will read buffer argument, split it to a list by lines,
|
|
sort it by defined rule, and return sorted buffer if it's CSS property.
|
|
This function depends on '_prioritify' function.
|
|
"""
|
|
css_pgs = _compile_props(CSS_PROPS_TEXT, grouped=False) # Do Not Group.
|
|
pattern = re.compile(r'(.*?{\r?\n?)(.*?)(}.*?)|(.*)',
|
|
re.DOTALL + re.MULTILINE)
|
|
matched_patterns = pattern.findall(css_unsorted_string)
|
|
sorted_patterns, sorted_buffer = [], css_unsorted_string
|
|
re_prop = re.compile(r'((?:.*?)(?:;)(?:.*?\n)|(?:.*))',
|
|
re.DOTALL + re.MULTILINE)
|
|
if len(matched_patterns) != 0:
|
|
for matched_groups in matched_patterns:
|
|
sorted_patterns += matched_groups[0].splitlines(True)
|
|
props = map(lambda line: line.lstrip('\n'),
|
|
re_prop.findall(matched_groups[1]))
|
|
props = list(filter(lambda line: line.strip('\n '), props))
|
|
props = _props_grouper(props, css_pgs)
|
|
sorted_patterns += props
|
|
sorted_patterns += matched_groups[2].splitlines(True)
|
|
sorted_patterns += matched_groups[3].splitlines(True)
|
|
sorted_buffer = ''.join(sorted_patterns)
|
|
return sorted_buffer
|
|
|
|
|
|
def remove_comments(css):
|
|
"""Remove all CSS comment blocks."""
|
|
iemac, preserve = False, False
|
|
comment_start = css.find("/*")
|
|
while comment_start >= 0: # Preserve comments that look like `/*!...*/`.
|
|
# Slicing is used to make sure we dont get an IndexError.
|
|
preserve = css[comment_start + 2:comment_start + 3] == "!"
|
|
comment_end = css.find("*/", comment_start + 2)
|
|
if comment_end < 0:
|
|
if not preserve:
|
|
css = css[:comment_start]
|
|
break
|
|
elif comment_end >= (comment_start + 2):
|
|
if css[comment_end - 1] == "\\":
|
|
# This is an IE Mac-specific comment; leave this one and the
|
|
# following one alone.
|
|
comment_start = comment_end + 2
|
|
iemac = True
|
|
elif iemac:
|
|
comment_start = comment_end + 2
|
|
iemac = False
|
|
elif not preserve:
|
|
css = css[:comment_start] + css[comment_end + 2:]
|
|
else:
|
|
comment_start = comment_end + 2
|
|
comment_start = css.find("/*", comment_start)
|
|
return css
|
|
|
|
|
|
def remove_unnecessary_whitespace(css):
|
|
"""Remove unnecessary whitespace characters."""
|
|
|
|
def pseudoclasscolon(css):
|
|
"""Prevent 'p :link' from becoming 'p:link'.
|
|
|
|
Translates 'p :link' into 'p ___PSEUDOCLASSCOLON___link'.
|
|
This is translated back again later.
|
|
"""
|
|
regex = re.compile(r"(^|\})(([^\{\:])+\:)+([^\{]*\{)")
|
|
match = regex.search(css)
|
|
while match:
|
|
css = ''.join([
|
|
css[:match.start()],
|
|
match.group().replace(":", "___PSEUDOCLASSCOLON___"),
|
|
css[match.end():]])
|
|
match = regex.search(css)
|
|
return css
|
|
|
|
css = pseudoclasscolon(css)
|
|
# Remove spaces from before things.
|
|
css = re.sub(r"\s+([!{};:>\(\)\],])", r"\1", css)
|
|
# If there is a `@charset`, then only allow one, and move to beginning.
|
|
css = re.sub(r"^(.*)(@charset \"[^\"]*\";)", r"\2\1", css)
|
|
css = re.sub(r"^(\s*@charset [^;]+;\s*)+", r"\1", css)
|
|
# Put the space back in for a few cases, such as `@media screen` and
|
|
# `(-webkit-min-device-pixel-ratio:0)`.
|
|
css = re.sub(r"\band\(", "and (", css)
|
|
# Put the colons back.
|
|
css = css.replace('___PSEUDOCLASSCOLON___', ':')
|
|
# Remove spaces from after things.
|
|
css = re.sub(r"([!{}:;>\(\[,])\s+", r"\1", css)
|
|
return css
|
|
|
|
|
|
def remove_unnecessary_semicolons(css):
|
|
"""Remove unnecessary semicolons."""
|
|
return re.sub(r";+\}", "}", css)
|
|
|
|
|
|
def remove_empty_rules(css):
|
|
"""Remove empty rules."""
|
|
return re.sub(r"[^\}\{]+\{\}", "", css)
|
|
|
|
|
|
def normalize_rgb_colors_to_hex(css):
|
|
"""Convert `rgb(51,102,153)` to `#336699`."""
|
|
regex = re.compile(r"rgb\s*\(\s*([0-9,\s]+)\s*\)")
|
|
match = regex.search(css)
|
|
while match:
|
|
colors = map(lambda s: s.strip(), match.group(1).split(","))
|
|
hexcolor = '#%.2x%.2x%.2x' % tuple(map(int, colors))
|
|
css = css.replace(match.group(), hexcolor)
|
|
match = regex.search(css)
|
|
return css
|
|
|
|
|
|
def condense_zero_units(css):
|
|
"""Replace `0(px, em, %, etc)` with `0`."""
|
|
return re.sub(r"([\s:])(0)(px|em|%|in|q|ch|cm|mm|pc|pt|ex|rem|s|ms|"
|
|
r"deg|grad|rad|turn|vw|vh|vmin|vmax|fr)", r"\1\2", css)
|
|
|
|
|
|
def condense_multidimensional_zeros(css):
|
|
"""Replace `:0 0 0 0;`, `:0 0 0;` etc. with `:0;`."""
|
|
return css.replace(":0 0 0 0;", ":0;").replace(
|
|
":0 0 0;", ":0;").replace(":0 0;", ":0;").replace(
|
|
"background-position:0;", "background-position:0 0;").replace(
|
|
"transform-origin:0;", "transform-origin:0 0;")
|
|
|
|
|
|
def condense_floating_points(css):
|
|
"""Replace `0.6` with `.6` where possible."""
|
|
return re.sub(r"(:|\s)0+\.(\d+)", r"\1.\2", css)
|
|
|
|
|
|
def condense_hex_colors(css):
|
|
"""Shorten colors from #AABBCC to #ABC where possible."""
|
|
regex = re.compile(
|
|
r"""([^\"'=\s])(\s*)#([0-9a-f])([0-9a-f])([0-9a-f])"""
|
|
r"""([0-9a-f])([0-9a-f])([0-9a-f])""", re.I | re.S)
|
|
match = regex.search(css)
|
|
while match:
|
|
first = match.group(3) + match.group(5) + match.group(7)
|
|
second = match.group(4) + match.group(6) + match.group(8)
|
|
if first.lower() == second.lower():
|
|
css = css.replace(
|
|
match.group(), match.group(1) + match.group(2) + '#' + first)
|
|
match = regex.search(css, match.end() - 3)
|
|
else:
|
|
match = regex.search(css, match.end())
|
|
return css
|
|
|
|
|
|
def condense_whitespace(css):
|
|
"""Condense multiple adjacent whitespace characters into one."""
|
|
return re.sub(r"\s+", " ", css)
|
|
|
|
|
|
def condense_semicolons(css):
|
|
"""Condense multiple adjacent semicolon characters into one."""
|
|
return re.sub(r";;+", ";", css)
|
|
|
|
|
|
def wrap_css_lines(css, line_length=80):
|
|
"""Wrap the lines of the given CSS to an approximate length."""
|
|
lines, line_start = [], 0
|
|
for i, char in enumerate(css):
|
|
# Its safe to break after } characters.
|
|
if char == '}' and (i - line_start >= line_length):
|
|
lines.append(css[line_start:i + 1])
|
|
line_start = i + 1
|
|
if line_start < len(css):
|
|
lines.append(css[line_start:])
|
|
return '\n'.join(lines)
|
|
|
|
|
|
def condense_font_weight(css):
|
|
"""Condense multiple font weights into shorter integer equals."""
|
|
return css.replace('font-weight:normal;', 'font-weight:400;').replace(
|
|
'font-weight:bold;', 'font-weight:700;')
|
|
|
|
|
|
def condense_std_named_colors(css):
|
|
"""Condense named color values to shorter replacement using HEX."""
|
|
for color_name, color_hexa in iter(tuple({
|
|
':aqua;': ':#0ff;', ':blue;': ':#00f;',
|
|
':fuchsia;': ':#f0f;', ':yellow;': ':#ff0;'}.items())):
|
|
css = css.replace(color_name, color_hexa)
|
|
return css
|
|
|
|
|
|
def condense_xtra_named_colors(css):
|
|
"""Condense named color values to shorter replacement using HEX."""
|
|
for k, v in iter(tuple(EXTENDED_NAMED_COLORS.items())):
|
|
same_color_but_rgb = 'rgb({0},{1},{2})'.format(v[0], v[1], v[2])
|
|
if len(k) > len(same_color_but_rgb):
|
|
css = css.replace(k, same_color_but_rgb)
|
|
return css
|
|
|
|
|
|
def remove_url_quotes(css):
|
|
"""Fix for url() does not need quotes."""
|
|
return re.sub(r'url\((["\'])([^)]*)\1\)', r'url(\2)', css)
|
|
|
|
|
|
def condense_border_none(css):
|
|
"""Condense border:none; to border:0;."""
|
|
return css.replace("border:none;", "border:0;")
|
|
|
|
|
|
def add_encoding(css):
|
|
"""Add @charset 'UTF-8'; if missing."""
|
|
return '@charset "utf-8";' + css if "@charset" not in css.lower() else css
|
|
|
|
|
|
def restore_needed_space(css):
|
|
"""Fix CSS for some specific cases where a white space is needed."""
|
|
return css.replace("!important", " !important").replace( # !important
|
|
"@media(", "@media (").replace( # media queries # jpeg > jpg
|
|
"data:image/jpeg;base64,", "data:image/jpg;base64,").rstrip("\n;")
|
|
|
|
|
|
def unquote_selectors(css):
|
|
"""Fix CSS for some specific selectors where Quotes is not needed."""
|
|
return re.compile('([a-zA-Z]+)="([a-zA-Z0-9-_\.]+)"]').sub(r'\1=\2]', css)
|
|
|
|
|
|
def css_minify(css, wrap=False, comments=False, sort=False, noprefix=False):
|
|
"""Minify CSS main function."""
|
|
css = remove_comments(css) if not comments else css
|
|
css = sort_properties(css) if sort else css
|
|
css = unquote_selectors(css)
|
|
css = condense_whitespace(css)
|
|
css = remove_url_quotes(css)
|
|
css = condense_xtra_named_colors(css)
|
|
css = condense_font_weight(css)
|
|
css = remove_unnecessary_whitespace(css)
|
|
css = condense_std_named_colors(css)
|
|
css = remove_unnecessary_semicolons(css)
|
|
css = condense_zero_units(css)
|
|
css = condense_multidimensional_zeros(css)
|
|
css = condense_floating_points(css)
|
|
css = normalize_rgb_colors_to_hex(css)
|
|
css = condense_hex_colors(css)
|
|
css = condense_border_none(css)
|
|
css = wrap_css_lines(css, 80) if wrap else css
|
|
css = condense_semicolons(css)
|
|
css = add_encoding(css) if not noprefix else css
|
|
css = restore_needed_space(css)
|
|
return css.strip()
|