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Optimize [] + nonlist as (list)nonlist.

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And minor comment changes.
This commit is contained in:
Sei Lisa 2014-08-17 16:31:46 +02:00
parent 2e87d6df8c
commit c2437b33e7
1 changed files with 6 additions and 9 deletions
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15
lslopt/lslfoldconst.py
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@ -245,12 +245,9 @@ class foldconst(object):
# Tough one. Remove neutral elements for the diverse types,
# and more.
if optype == 'list' and not (ltype == rtype == 'list'):
# Nothing to do with list + nonlist or nonlist + list.
# FIXME: Not true. (list)"string" is a 5 byte saving vs.
# [] + "string". Activating explicitcast forces the
# conversion [] + (list)"string" -> (list)"string" which
# is what we want here, but it is a loss for other types.
# Further analysis needed.
if lnt == 'CONST' and not lval['value']:
# [] + nonlist -> (list)nonlist
parent[index] = self.Cast(rval, optype)
return
if optype in ('vector', 'rotation'):
@ -264,16 +261,16 @@ class foldconst(object):
return
# Can't be key, as no combo of addition operands returns key
# All these types evaluate as boolean False when they are
# All these types evaluate to boolean False when they are
# the neutral addition element.
if optype in ('string', 'float', 'list'):
if lnt == 'CONST' and not lval['value']:
# 0 + expr -> expr
# 0. + expr -> expr
# "" + expr -> expr
# [] + expr -> expr
parent[index] = self.Cast(rval, optype)
elif rnt == 'CONST' and not rval['value']:
# expr + 0 -> expr
# expr + 0. -> expr
# expr + "" -> expr
# expr + [] -> expr
parent[index] = self.Cast(lval, optype)