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from __future__ import absolute_import, unicode_literals
import re
from django.utils.html import escape
import sqlparse
from sqlparse import tokens as T
class BoldKeywordFilter:
"""sqlparse filter to bold SQL keywords"""
def process(self, stack, stream):
"""Process the token stream"""
for token_type, value in stream:
is_keyword = token_type in T.Keyword
if is_keyword:
yield T.Text, '<strong>'
yield token_type, escape(value)
if is_keyword:
yield T.Text, '</strong>'
def reformat_sql(sql):
stack = sqlparse.engine.FilterStack()
stack.preprocess.append(BoldKeywordFilter()) # add our custom filter
stack.postprocess.append(sqlparse.filters.SerializerUnicode()) # tokens -> strings
return swap_fields(''.join(stack.run(sql)))
def swap_fields(sql):
expr = r'SELECT</strong> (...........*?) <strong>FROM'
subs = (r'SELECT</strong> '
r'<a class="djDebugUncollapsed djDebugToggle" href="#">•••</a> '
r'<a class="djDebugCollapsed djDebugToggle" href="#">\1</a> '
r'<strong>FROM')
return re.sub(expr, subs, sql)
def contrasting_color_generator():
"""
Generate constrasting colors by varying most significant bit of RGB first,
and then vary subsequent bits systematically.
"""
def rgb_to_hex(rgb):
return '#%02x%02x%02x' % tuple(rgb)
triples = [(1, 0, 0), (0, 1, 0), (0, 0, 1),
(1, 1, 0), (0, 1, 1), (1, 0, 1), (1, 1, 1)]
n = 1 << 7
so_far = [[0, 0, 0]]
while True:
if n == 0: # This happens after 2**24 colours; presumably, never
yield "#000000" # black
copy_so_far = list(so_far)
for triple in triples:
for previous in copy_so_far:
rgb = [n * triple[i] + previous[i] for i in range(3)]
so_far.append(rgb)
yield rgb_to_hex(rgb)
n >>= 1
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