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Make DoesSomething apply to labels optionally.

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Allows detection of empty events, for example, even if they have labels.

Also, it is OK if there's a label inserted in a nested {}; that case wasn't contemplated.
This commit is contained in:
Sei Lisa 2017-10-29 13:18:35 +01:00
parent f2a6243695
commit e13f210695
1 changed files with 9 additions and 6 deletions
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15
lslopt/lslfoldconst.py
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@ -131,17 +131,20 @@ class foldconst(object):
else:
idx += 1
def DoesSomething(self, node):
def DoesSomething(self, node, labels = True):
"""Tell if a subtree does something or is just empty statements
(a pure combination of ';' and '{}')
(a pure combination of ';' and '{}'). Labels are the top level are
considered to do something if labels is True, and vice versa.
Not to be confused with lslparse.does_something which includes labels,
and applies to a block's statement list, not to a node.
Not to be confused with lslparse.does_something which always includes
labels, and applies to a block's statement list, not to a node.
"""
if node['nt'] != ';':
maybe_label = ';' if labels else '@'
if maybe_label != node['nt'] != ';':
if node['nt'] == '{}':
for subnode in node['ch']:
if self.DoesSomething(subnode):
# Labels embedded in {} are not reachable. They do nothing.
if self.DoesSomething(subnode, labels = False):
return True
else:
return True