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Do -(b + -c) -> -b+c. Also when a-b is transformed to a+-b, fold -b.

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Sei Lisa 2015-03-29 06:09:26 +02:00
parent a859b3e8e4
commit be86216124
1 changed files with 14 additions and 1 deletions
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15
lslopt/lslfoldconst.py
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@ -299,8 +299,20 @@ class foldconst(object):
return
if nt == 'NEG':
# TODO: -(b + -c) -> -b+c, -(-b + c) -> b + -c
self.FoldTree(child, 0)
if child[0]['nt'] == '+' and (child[0]['ch'][0]['nt'] == 'NEG'
or child[0]['ch'][1]['nt'] == 'NEG'):
node = parent[index] = child[0]
child = node['ch']
for a in (0, 1):
if child[a]['nt'] == 'NEG':
child[a] = child[a]['ch'][0]
else:
child[a] = {'nt':'NEG','t':child[a]['t'],'ch':[child[a]]}
self.FoldTree(child, a)
return
if child[0]['nt'] == 'NEG':
# Double negation: - - expr -> expr
node = parent[index] = child[0]['ch'][0]
@ -469,6 +481,7 @@ class foldconst(object):
rnt = 'NEG'
RSEF = 'SEF' in rval
rval = child[1] = {'nt':rnt, 't':rval['t'], 'ch':[rval]}
self.FoldTree(child, 1)
if RSEF:
rval['SEF'] = True
# rtype unchanged