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import re |
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import jinja2 |
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import jinja2.ext |
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import jinja2.lexer |
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class SGMLCompressContext(object): |
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re_whitespace = re.compile('[ \\t\\r\\n]+') |
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token_class = jinja2.lexer.Token |
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block_tokens = { |
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'variable_begin': 'variable_end', |
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'block_begin': 'block_end' |
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} |
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block_tags = {} # block content will be treated as literal text |
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jumps = { # state machine jumps |
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'text': { |
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'<': 'tag', |
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'<!--': 'comment', |
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'<![CDATA[': 'cdata', |
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}, |
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'lit1': {'"': 'tag'}, |
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'lit2': ("'", 'tag'), |
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'tag': { |
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'>': 'text', |
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'"': 'lit1', |
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"'": 'lit2' |
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}, |
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'comment': {'-->': 'text'}, |
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'cdata': {']]>': 'text'} |
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} |
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def __init__(self): |
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self.start = '' # character which started current stae |
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self.current = 'text' # current state |
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self.pending = '' # buffer of current state data |
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self.lineno = 0 # current token lineno |
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self.skip_until_token = None # inside token until this is met |
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self.skip_until = None # inside literal tag until this is met |
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def finalize(self): |
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if self.pending: |
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data = self._minify(self.pending, self.current, self.start, True) |
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yield self.token_class(self.lineno, 'data', data) |
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self.start = '' |
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self.pending = '' |
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def _minify(self, data, current, start, partial=False): |
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if current == 'tag': |
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tagstart = start == '<' |
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data = self.re_whitespace.sub(' ', data[1:] if tagstart else data) |
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if tagstart: |
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data = data.lstrip() if partial else data.strip() |
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tagname = data.split(' ', 1)[0] |
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self.skip_until = self.block_tags.get(tagname) |
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return '<' + data |
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elif partial: |
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return data.rstrip() |
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return start if data.strip() == start else data |
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elif current == 'text': |
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if not self.skip_until: |
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return start if data.strip() == start else data |
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elif not partial: |
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self.skip_until = None |
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return data |
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return data |
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def _options(self, value, current, start): |
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offset = len(start) |
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if self.skip_until and current == 'text': |
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mark = self.skip_until |
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index = value.find(mark, offset) |
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if -1 != index: |
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yield index, mark, current |
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else: |
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for mark, next in self.jumps[current].items(): |
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index = value.find(mark, offset) |
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if -1 != index: |
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yield index, mark, next |
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yield len(value), '', None # avoid value errors on empty min() |
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def feed(self, token): |
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if self.skip_until_token: |
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yield token |
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if token.type == self.skip_until_token: |
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self.skip_until_token = None |
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return |
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if token.type in self.block_tokens: |
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for data in self.finalize(): |
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yield data |
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yield token |
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self.skip_until_token = self.block_tokens[token.type] |
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return |
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size = len(token.value) |
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lineno = token.lineno |
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self.pending += token.value |
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while True: |
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index, mark, next = min( |
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self._options(self.pending, self.current, self.start), |
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key=lambda x: (x[0], -len(x[1])) |
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) |
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if next is None: |
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break |
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data = self._minify(self.pending[:index], self.current, self.start) |
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self.lineno = lineno if size > len(self.pending) else self.lineno |
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self.start = mark |
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self.current = next |
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self.pending = self.pending[index:] |
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yield self.token_class(self.lineno, 'data', data) |
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113
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114
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class HTMLCompressContext(SGMLCompressContext): |
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block_tags = { |
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'textarea': '</textarea>', |
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'pre': '</pre>', |
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'script': '</script>', |
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'style': '</style>', |
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} |
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122
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123
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class HTMLCompress(jinja2.ext.Extension): |
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context_class = HTMLCompressContext |
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126
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def filter_stream(self, stream): |
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feed = self.context_class() |
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for token in stream: |
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for data in feed.feed(token): |
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yield data |
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for data in feed.finalize(): |
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yield data |
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ergoithz /
browsepy
