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from .utils import FlexibleIterator
"""
Objective: add an INDENT token and a DEDENT token arround every block.
Strategy: put after every ":" that is not in a slice/dictionary declaration/lambda.
Slice and dictionary are easy: increase a number when a "[" or "{" is found,
decrease it for a "]" or "}". If the number is != 0, we are in a dictionary or
slice -> do not put a INDENT when a ":" is found.
Lambda are a bit different: increase another number when a "lambda" is found,
if the number is != 0 and a ":" is found, decrease this number, otherwise put a
INDENT.
For the DEDENT, I'm probably going to need to keep a list of indentation and
decheck the last one every time I encounter a meaningfull line. Still need to
test this idea.
"""
def mark_indentation(sequence):
return list(mark_indentation_generator(sequence))
def transform_tabs_to_spaces(string):
return string.replace("\t", " " * 8)
def get_space(node):
""" Return space formatting information of node.
If the node does not have a third formatting item - like in
a ('ENDL', '\n') node - then we return None as a flag value. This is
maybe not the best behavior but it seems to work for now.
"""
if len(node) < 4 or len(node[3]) == 0:
return None
return transform_tabs_to_spaces(node[3][0][1])
def mark_indentation_generator(sequence):
iterator = FlexibleIterator(sequence)
current = None, None
indentations = []
while True:
if iterator.end():
return
current = next(iterator)
if current is None:
return
# end of the file, I need to pop all indentations left and put the
# corresponding dedent token for them
if current[0] == "ENDMARKER" and indentations:
while len(indentations) > 0:
yield ('DEDENT', '')
indentations.pop()
# if were are at ":\n" like in "if stuff:\n"
if current[0] == "COLON" and iterator.show_next(1)[0] == "ENDL":
# if we aren't in "if stuff:\n\n"
if iterator.show_next(2)[0] not in ("ENDL",):
indentations.append(get_space(iterator.show_next()))
yield current
yield next(iterator)
yield ('INDENT', '')
continue
else: # else, skip all "\n"
yield current
for i in iterator:
if i[0] == 'ENDL' and iterator.show_next()[0] not in ('ENDL',):
indentations.append(get_space(i))
yield ('INDENT', '')
yield i
break
yield i
continue
# if we were in an indented situation and that the next line has a lower indentation
if indentations and current[0] == "ENDL":
the_indentation_level_changed = get_space(current) is None or get_space(current) != indentations[-1]
if the_indentation_level_changed and iterator.show_next()[0] not in ("ENDL", "COMMENT"):
new_indent = get_space(current) if len(current) == 4 else ""
yield current
# pop until reaching the matching indentation level
while indentations and string_is_bigger(indentations[-1], new_indent):
indentations.pop()
yield ('DEDENT', '')
yield next(iterator)
continue
yield current
def string_is_bigger(s1, s2):
""" Return s1 > s2 by taking into account None values.
None is always smaller than any string.
None > "string" works in python2 but not in python3. This function
makes it work in python3 too.
"""
if s1 is None:
return False
elif s2 is None:
return True
else:
return s1 > s2
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