/**
* @param hop
* @param vars
* @throws DMLRuntimeException
*/
protected static void rReplaceLiterals(Hop hop, LocalVariableMap vars)
throws DMLRuntimeException {
if (hop.getVisited() == VisitStatus.DONE) return;
if (hop.getInput() != null) {
// indexed access to allow parent-child modifications
for (int i = 0; i < hop.getInput().size(); i++) {
Hop c = hop.getInput().get(i);
Hop lit = null;
// conditional apply of literal replacements
lit = (lit == null) ? replaceLiteralScalarRead(c, vars) : lit;
lit = (lit == null) ? replaceLiteralValueTypeCastScalarRead(c, vars) : lit;
lit = (lit == null) ? replaceLiteralValueTypeCastLiteral(c, vars) : lit;
lit = (lit == null) ? replaceLiteralDataTypeCastMatrixRead(c, vars) : lit;
lit = (lit == null) ? replaceLiteralValueTypeCastRightIndexing(c, vars) : lit;
lit = (lit == null) ? replaceLiteralFullUnaryAggregate(c, vars) : lit;
lit = (lit == null) ? replaceLiteralFullUnaryAggregateRightIndexing(c, vars) : lit;
// replace hop w/ literal on demand
if (lit != null) {
// replace hop c by literal, for all parents to prevent (1) missed opportunities
// because hop c marked as visited, and (2) repeated evaluation of uagg ops
if (c.getParent().size() > 1) { // multiple parents
ArrayList<Hop> parents = new ArrayList<Hop>(c.getParent());
for (Hop p : parents) {
int pos = HopRewriteUtils.getChildReferencePos(p, c);
HopRewriteUtils.removeChildReferenceByPos(p, c, pos);
HopRewriteUtils.addChildReference(p, lit, pos);
}
} else { // current hop is only parent
HopRewriteUtils.removeChildReferenceByPos(hop, c, i);
HopRewriteUtils.addChildReference(hop, lit, i);
}
}
// recursively process children
else {
rReplaceLiterals(c, vars);
}
}
}
hop.setVisited(VisitStatus.DONE);
}
