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Fix extendedtypecast problem with negative constants after typecasts.

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Sei Lisa 2015-06-23 06:35:27 +02:00
parent 4cc268b574
commit 1160fea8cf
1 changed files with 22 additions and 1 deletions
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23
lslopt/lslparse.py
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@ -984,7 +984,28 @@ list lazy_list_set(list L, integer i, list v)
if self.extendedtypecast:
# Allow any unary expression (except assignment). The type cast
# acts as a prefix operator.
expr = self.Parse_unary_expression(AllowAssignment = False)
# Deal with the case of minus a constant integer or float.
# E.g. ~(integer)-2*3 should be parsed as (~(integer)-2)*3
# and not as ~(integer)(-(2*3))
# Note ~(integer)-a*3 is also parsed as ~(integer)(-a)*3
# which is bordering a violation of the POLA because of the
# priority of - with respect to *. But the syntax is quite
# explicit: what is typecast is always a unary expression,
# therefore processed first.
if self.tok[0] == '-':
self.NextToken()
if self.tok[0] == 'INTEGER_VALUE':
expr = {'nt':'CONST','t':'integer','value':-self.tok[1]}
self.NextToken()
elif self.tok[0] == 'FLOAT_VALUE':
expr = {'nt':'CONST','t':'float','value':-self.tok[1]}
self.NextToken()
else:
expr = self.Parse_unary_expression(AllowAssignment = False)
expr = {'nt':'NEG','t':expr['t'],'ch':[expr]}
else:
expr = self.Parse_unary_expression(AllowAssignment = False)
else:
if self.tok[0] == '(':
self.NextToken()