Viewing file:  Remove_concat_null.cpp (1.1 KB) -rw-rw-r--
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/*
* phc -- the open source PHP compiler
* See doc/license/README.license for licensing information
*
* Remove concatenations to empty strings (which are generated by the parser)
*/
#include "Remove_concat_null.h"
using namespace AST;
Expr* Remove_concat_null::post_bin_op(Bin_op* in)
{
STRING* empty = new STRING(new String(""));
Wildcard<Expr>* wildcard = new Wildcard<Expr>;
// Unparsing may break when we start removing concats without clearing
// the in_string flags. Hence, we clear all such flags here and this
// pass should only be run after the AST (as part of the translation
// to the HIR)
in->op->attrs->erase("phc.unparser.in_string_syntax.simple");
in->op->attrs->erase("phc.unparser.in_string_syntax.delimited");
in->op->attrs->erase("phc.unparser.in_string_syntax.complex");
// Replace with right operand if left operand is the empty string
if(in->match(new Bin_op(empty, wildcard, ".")))
{
return wildcard->value;
}
// Replace with left operand if right operand is the empty string
if(in->match(new Bin_op(wildcard, empty, ".")))
return wildcard->value;
return in;
}
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