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Fix "" + list_expr producing list_expr

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The type checks were not strong enough. While on it, strengthen other similar checks as well.

Reported by @Tonaie. Fixes #13.
This commit is contained in:
Sei Lisa 2020-04-23 13:39:34 +02:00
parent 4d75f0f792
commit 0affbf13dd
5 changed files with 68 additions and 9 deletions
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26
lslopt/lslfoldconst.py
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@ -905,7 +905,7 @@ class foldconst(object):
rnt = rval.nt
if optype == 'list' and not (ltype == rtype == 'list'):
if lnt == 'CONST' and not lval.value:
if lnt == 'CONST' and ltype == 'list' and not lval.value:
# [] + nonlist -> (list)nonlist
parent[index] = self.Cast(rval, optype)
# node is SEF if rval is
@ -928,18 +928,26 @@ class foldconst(object):
if optype in ('string', 'float', 'list'):
# All these types evaluate to boolean False when they are
# the neutral addition element.
if lnt == 'CONST' and not lval.value:
# 0. + expr -> expr
# "" + expr -> expr
# [] + expr -> expr
if lnt == 'CONST' and not lval.value and (ltype == rtype
or ltype == 'integer' and rtype == 'float'
or ltype == 'float' and rtype == 'integer'):
# 0 + fval -> fval
# 0. + fval -> fval
# 0. + ival -> fval
# "" + sval -> sval
# [] + lval -> lval
parent[index] = self.Cast(rval, optype)
# node is SEF if rval is
parent[index].SEF = rval.SEF
return
if rnt == 'CONST' and not rval.value:
# expr + 0. -> expr
# expr + "" -> expr
# expr + [] -> expr
if rnt == 'CONST' and not rval.value and (rtype == ltype
or rtype == 'integer' and ltype == 'float'
or rtype == 'float' and ltype == 'integer'):
# fval + 0 -> fval
# fval + 0. -> fval
# ival + 0. -> fval
# sval + "" -> sval
# lval + [] -> lval
parent[index] = self.Cast(lval, optype)
# node is SEF if lval is
parent[index].SEF = lval.SEF