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(Limitedly) apply distributive law for string and integer addition.

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Sei Lisa 2015-02-12 07:47:35 +01:00
parent 4461f36dce
commit 6fb947fbc9
1 changed files with 33 additions and 11 deletions
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44
lslopt/lslfoldconst.py
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@ -185,9 +185,18 @@ class foldconst(object):
if 'SEF' in child[0] and 'SEF' in child[1]:
# Propagate SEF flag if both sides are side-effect free.
node['SEF'] = True
if child[0]['nt'] == child[1]['nt'] == 'CONST':
op1 = child[0]['value']
op2 = child[1]['value']
optype = node['t']
lval = child[0]
ltype = lval['t']
lnt = lval['nt']
rval = child[1]
rtype = rval['t']
rnt = rval['nt']
if lnt == rnt == 'CONST':
op1 = lval['value']
op2 = rval['value']
if nt == '+':
result = lslfuncs.add(op1, op2)
elif nt == '-':
@ -233,13 +242,6 @@ class foldconst(object):
return
# Simplifications for particular operands
optype = node['t']
lval = child[0]
ltype = lval['t']
lnt = lval['nt']
rval = child[1]
rtype = rval['t']
rnt = rval['nt']
if nt == '-':
if optype in ('vector', 'rotation'):
if lnt == 'CONST' and all(component == 0 for component in lval['value']):
@ -271,12 +273,32 @@ class foldconst(object):
# and more.
# Remove redundant parentheses
if lnt == '()' and lval['ch'][0]['nt'] in ('+', '-', '*', '/', '%'):
if lnt == '()' and lval['ch'][0]['nt'] in ('+', '-', '*', '/', '%', '~', '!', 'NEG', 'CAST', 'V++', 'V--', '++V', '--V'):
# (a op b) + c -> a op b + c
# (op b) + c -> op b + c
# where op's priority is that of + or greater
lval = child[0] = lval['ch'][0]
lnt = '+'
# Addition of integers, strings, and lists is distributive
# Addition of floats, vectors and rotations would be, except
# for FP precision.
# TODO: distributive addition of lists
# Distributive lists are trickier, because unlike the others,
# the types of the operands may not be lists.
if optype in ('integer', 'string'):
if lnt == '+' and rnt == 'CONST' and lval['ch'][1]['nt'] == 'CONST':
# (var + ct1) + ct2 -> var + (ct1 + ct2)
child[1] = {'nt': '+', 't': optype, 'ch':[lval['ch'][1], rval], 'SEF':True}
lval = child[0] = lval['ch'][0]
lnt = lval['nt']
ltype = lval['t']
rtype = optype
# Fold the RHS again now that we have it constant
self.FoldTree(child, 1)
rval = child[1]
rnt = rval['nt']
if optype == 'list' and not (ltype == rtype == 'list'):
if lnt == 'CONST' and not lval['value']:
# [] + nonlist -> (list)nonlist