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Apply an associativity rule to strings

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It's not general associativity, it just folds CONST + (CONST + expr). Some day we'll implement sum flattening, to make this possible.
This commit is contained in:
Sei Lisa 2018-11-19 19:05:41 +01:00
parent e2d01e7825
commit 0a6155bb13
1 changed files with 15 additions and 2 deletions
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17
lslopt/lslfoldconst.py
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@ -939,6 +939,20 @@ class foldconst(object):
lnt, rnt = rnt, lnt
ltype, rtype = rtype, ltype
if (self.addstrings and optype == 'string' and rnt == '+'
and rval.ch[0].nt == 'CONST' and lnt == 'CONST'
):
# We have CONST + (CONST + expr) of strings.
# Apply associativity to merge both constants.
# Add the constants
child[0].value = lslfuncs.add(child[0].value,
rval.ch[0].value)
# Prune the expr and graft it as RHS
child[1] = rval.ch[1]
# Re-optimize this node to apply it recursively
return self.FoldTree(parent, index)
# Nothing else to do with addition of float, string or list
return
@ -963,8 +977,7 @@ class foldconst(object):
# Apply associativity to merge both constants.
# Add the constants
child[0].value = lslfuncs.S32(child[0].value
+ rval.ch[0].value)
lval.value = lslfuncs.add(lval.value, rval.ch[0].value)
# Prune the expr and graft it as RHS
child[1] = rval.ch[1]