mirror of https://github.com/zulip/zulip.git
98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
import difflib
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import platform
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import logging
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# TODO: handle changes in link hrefs
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def highlight_with_class(klass, text):
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return '<span class="%s">%s</span>' % (klass, text)
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def highlight_inserted(text):
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return highlight_with_class('highlight_text_inserted', text)
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def highlight_deleted(text):
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return highlight_with_class('highlight_text_deleted', text)
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def highlight_replaced(text):
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return highlight_with_class('highlight_text_replaced', text)
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def chunkize(text, in_tag):
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start = 0
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idx = 0
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chunks = []
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for c in text:
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if c == '<':
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in_tag = True
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if start != idx:
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chunks.append(('text', text[start:idx]))
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start = idx
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elif c == '>':
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in_tag = False
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if start != idx + 1:
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chunks.append(('tag', text[start:idx + 1]))
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start = idx + 1
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idx += 1
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if start != idx:
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chunks.append(('tag' if in_tag else 'text', text[start:idx]))
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return chunks, in_tag
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def highlight_chunks(chunks, highlight_func):
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retval = ''
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for type, text in chunks:
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if type == 'text':
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retval += highlight_func(text)
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else:
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retval += text
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return retval
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def verify_html(html):
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# TODO: Actually parse the resulting HTML to ensure we don't
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# create mal-formed markup. This is unfortunately hard because
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# we both want pretty strict parsing and we want to parse html5
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# fragments. For now, we do a basic sanity check.
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in_tag = False
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for c in html:
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if c == '<':
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if in_tag:
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return False
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in_tag = True
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elif c == '>':
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if not in_tag:
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return False
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in_tag = False
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if in_tag:
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return False
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return True
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def highlight_html_differences(s1, s2):
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sm = difflib.SequenceMatcher(lambda c: c in " \t\v\n", s1, s2, autojunk=False)
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retval = ''
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in_tag = False
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for op, i1, i2, j1, j2 in sm.get_opcodes():
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if op == 'replace':
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chunks, in_tag = chunkize(s2[j1:j2], in_tag)
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retval += highlight_chunks(chunks, highlight_replaced)
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elif op == 'delete':
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retval += highlight_deleted(' ')
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elif op == 'insert':
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chunks, in_tag = chunkize(s2[j1:j2], in_tag)
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retval += highlight_chunks(chunks, highlight_inserted)
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elif op == 'equal':
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chunks, in_tag = chunkize(s2[j1:j2], in_tag)
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retval += s2[j1:j2]
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if not verify_html(retval):
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from zephyr.lib.actions import internal_send_message
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# We probably want more information here
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logging.getLogger('').error('HTML diff produced mal-formed HTML')
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subject = "HTML diff failure on %s" % (platform.node(),)
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internal_send_message("humbug+errors@humbughq.com", "stream",
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"errors", subject, "HTML diff produced malformed HTML")
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return s2
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return retval
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