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/**
* @file predicatepostfixexpr.C
*
* @brief Implementation for predicate which allows callers to chain multiple
* other predicates together in complex logical expressions, and then
* evaluate them against a target
*/
//******************************************************************************
// Includes
//******************************************************************************
// STD
// Other Host Boot Components
#include <assert.h>
// Targeting Component
#include <targeting/predicates/predicatepostfixexpr.H>
#include "../trace.H"
//******************************************************************************
// Macros
//******************************************************************************
#undef TARG_NAMESPACE
#undef TARG_CLASS
#undef TARG_FN
//******************************************************************************
// Interface
//******************************************************************************
namespace TARGETING
{
#define TARG_NAMESPACE "TARGETING::"
#define TARG_CLASS "PredicatePostfixExpr::"
//******************************************************************************
// PredicatePostfixExpr::PredicatePostfixExpr
//******************************************************************************
PredicatePostfixExpr::PredicatePostfixExpr()
{
}
//******************************************************************************
// PredicatePostfixExpr::~PredicatePostfixExpr
//******************************************************************************
PredicatePostfixExpr::~PredicatePostfixExpr()
{
}
//******************************************************************************
// PredicatePostfixExpr::push
//******************************************************************************
PredicatePostfixExpr& PredicatePostfixExpr::push(
const PredicateBase* const i_pPredicate)
{
#define TARG_FN "push(...)"
assert(i_pPredicate != NULL,
TARG_LOC "Caller supplied a NULL predicate");
Operation l_op = {EVAL,i_pPredicate};
iv_ops.push_back(l_op);
return *this;
#undef TARG_FN
}
//******************************************************************************
// PredicatePostfixExpr::And
//******************************************************************************
PredicatePostfixExpr& PredicatePostfixExpr::And()
{
#define TARG_FN "And()"
Operation l_op = {AND,NULL};
iv_ops.push_back(l_op);
return *this;
#undef TARG_FN
}
//******************************************************************************
// PredicatePostfixExpr::Not
//******************************************************************************
PredicatePostfixExpr& PredicatePostfixExpr::Not()
{
#define TARG_FN "Not()"
Operation l_op = {NOT,NULL};
iv_ops.push_back(l_op);
return *this;
#undef TARG_FN
}
//******************************************************************************
// PredicatePostfixExpr::Or
//******************************************************************************
PredicatePostfixExpr& PredicatePostfixExpr::Or()
{
#define TARG_FN "Or()"
Operation l_op = {OR,NULL};
iv_ops.push_back(l_op);
return *this;
#undef TARG_FN
}
//******************************************************************************
// PredicatePostfixExpr::operator()
//******************************************************************************
bool PredicatePostfixExpr::operator()(
const Target* const i_pTarget) const
{
#define TARG_FN "operator()(...)"
assert(i_pTarget != NULL,
TARG_LOC "Caller supplied a NULL target");
std::vector<bool> l_stack;
bool l_result = false;
for(uint32_t i=0; i<iv_ops.size(); ++i)
{
switch(iv_ops[i].logicalOp)
{
case EVAL:
l_stack.push_back((*iv_ops[i].pPredicate)(i_pTarget));
break;
case AND:
assert(l_stack.size() >= 2,
TARG_LOC "Stack for AND must be >=2 but is %d",
l_stack.size());
l_result = l_stack.back();
l_stack.pop_back();
l_stack.back() &= l_result;
break;
case OR:
assert(l_stack.size() >= 2,
TARG_LOC "Stack for OR must be >= 2 but is %d",
l_stack.size());
l_result = l_stack.back();
l_stack.pop_back();
l_stack.back() |= l_result;
break;
case NOT:
assert(l_stack.size() >= 1,
TARG_LOC "Stack for NOT must be >= 1 but is %d",
l_stack.size());
l_stack.back() = !l_stack.back();
break;
default:
assert(0,
TARG_LOC "Attempted to evaluate unsupported "
"logical operation %d",
iv_ops[i].logicalOp);
break;
}
}
// If no predicates and we haven't asserted (no misformatting), element
// should be returned
if(l_stack.size() == 0)
{
l_result = true;
}
else
{
assert(l_stack.size() == 1,
TARG_LOC "Postfix expression created incorrectly. Stack "
"size should be 1 but is %d",
l_stack.size());
l_result = l_stack.front();
}
return l_result;
#undef TARG_FN
}
#undef TARG_CLASS
#undef TARG_NAMESPACE
} // End namespace TARGETING
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