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Implement ~-~-~-expr -> expr + -3

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Gets rid of a TODO
This commit is contained in:
Sei Lisa 2018-06-02 16:47:07 +02:00
parent 464797020a
commit a33dc8540f
1 changed files with 14 additions and 1 deletions
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15
lslopt/lslfoldconst.py
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@ -688,7 +688,20 @@ class foldconst(object):
subexpr = child[0]
node.SEF = subexpr.SEF
# TODO: ~-~-~-expr -> expr + -3 (see NEG for similar exp + 3)
if child[0].nt == 'NEG':
track = child[0].ch[0]
const = -1
while track.nt == '~' and track.ch[0].nt == 'NEG':
const -= 1
track = track.ch[0].ch[0]
if const < -2:
# ~-~-~-expr -> expr + (-3)
node = nr(nt='CONST', t='integer', SEF=True, value=const)
node = nr(nt='+', t='integer', ch=[node, track],
SEF=track.SEF)
parent[index] = node
self.FoldTree(parent, index)
return
if subexpr.nt == '~':
# Double negation: ~~expr