std::string Variables::evaluate(const std::string &expr) const
{
std::size_t opPos;
std::string result = expr;
opPos = expr.find_first_of("+-");
if (opPos != std::string::npos)
{
long op1, op2, value;
try {
op1 = std::stol(expr.substr(0, opPos));
} catch (...) {
throw TemplateException("Non-numeric operand 1 found in expression '" + expr + "'", false);
}
try {
op2 = std::stol(expr.substr(opPos+1));
} catch (...) {
throw TemplateException("Non-numeric operand 2 found in expression '" + expr + "'", false);
}
if (expr[opPos] == '-')
value = op1 - op2;
else
value = op1 + op2;
if (value < 0)
{
throw TemplateException("Result of expression '" + expr + "' is negative, only >0 results allowed", false);
}
result = std::to_string(value);
}
return result;
}
std::string Variable::getValue(size_t idx) const
{
//
// If no value assigned yet, throw an exception
if (m_values.empty())
{
std::string msg = "Attempt to get value of uninitialized input '" + m_name + "'";
throw TemplateException(msg, false);
}
//
// If there is only one value, then it's a single value input, so just return the first index regardless
if (m_values.size() == 1)
{
idx = 0;
}
//
// Otherwise, make sure the requested index is in range
else if (idx >= m_values.size())
{
std::string msg = "Attempt to get value out of range (" + std::to_string(idx) + "), size = " + std::to_string(m_values.size()) + " for '" + m_name +"'";
throw TemplateException(msg, false);
}
return m_values[idx];
}
std::shared_ptr<Variable> variableFactory(const std::string &type, const std::string &name)
{
std::shared_ptr<Variable> pInput;
if (type == "string")
{
pInput = std::make_shared<Variable>(name);
}
else if (type == "iprange")
{
pInput = std::make_shared<IPAddressRangeVariable>(name);
}
else if (type == "ipaddress")
{
pInput = std::make_shared<IPAddressVariable>(name);
}
else if (type == "hostname")
{
pInput = std::make_shared<HostNameVariable>(name);
}
else
{
throw TemplateException("Invalid input type '" + type + "'");
}
return pInput;
}
std::shared_ptr<Variable> Variables::getVariable(const std::string &name, bool throwIfNotFound) const
{
std::shared_ptr<Variable> pRetVar;
std::string varName = name;
//
// Accept both a regular string or a {{name}} string for the input name
std::size_t bracesStartPos = name.find("{{");
if (bracesStartPos != std::string::npos)
{
std::size_t bracesEndPos = findClosingDelimiter(name, bracesStartPos,"{{", "}}");
varName = name.substr(bracesStartPos + 2, bracesEndPos - bracesStartPos - 2);
}
for (auto &pVar: m_variables)
{
if (pVar->getName() == varName)
{
pRetVar = pVar;
break;
}
}
if (!pRetVar && throwIfNotFound)
{
throw TemplateException("Unable to find variable, name = '" + name + "'.");
}
return pRetVar;
}
TokenFor::TokenFor(wstring expr)
{
std::vector<wstring> elements ;
boost::split(elements, expr, boost::is_space()) ;
if (elements.size() != 4u)
{
throw TemplateException("Invalid syntax in for statement") ;
}
m_val = elements[1] ;
m_key = elements[3] ;
}
void Variables::add(const std::shared_ptr<Variable> pVariable)
{
for (auto &pVar: m_variables)
{
if (pVar->getName() == pVariable->getName())
{
throw TemplateException("Variable '" + pVariable->getName() + "' is a duplicate.", true);
}
}
m_variables.emplace_back(pVariable);
}
void HostNameVariable::addValue(const std::string &value) {
std::string hostname = trim(value);
bool isValid = true;
if (hostname.empty())
{
throw TemplateException("Hostname is empty", false);
}
m_values.emplace_back(hostname);
}
std::size_t Variables::findClosingDelimiter(const std::string &input, std::size_t startPos, const std::string &openDelim, const std::string &closeDelim) const
{
std::size_t curPos = startPos + openDelim.length();
std::size_t openPos, closePos;
unsigned depth = 1;
do
{
closePos = input.find(closeDelim, curPos);
openPos = input.find(openDelim, curPos);
if (closePos == std::string::npos)
{
throw TemplateException("Missing closing delimiter '" + closeDelim + "' string = '" + input + "'", false);
}
if (openPos != std::string::npos && closePos > openPos)
{
++depth;
curPos = openPos + openDelim.length();
}
else
{
if (--depth > 0)
{
if (openPos != std::string::npos)
{
++depth;
curPos = openPos + openDelim.length();
}
else
{
curPos = closePos + closeDelim.length();
}
}
}
} while (depth > 0);
return closePos;
}
void IPAddressVariable::addValue(const std::string &value) {
std::string ipAddr = trim(value);
bool isValid = true;
//
// Figure out what this def entails. Look at the number of parts. If one part, just
// save it.
std::vector<std::string> addressParts = splitString(ipAddr, ".");
if (addressParts.size() == 4)
{
for (unsigned i = 0; i < 4 && isValid; ++i)
{
try
{
int num = std::stoi(addressParts[i]);
if (num <= 0 || num > 255)
{
isValid = false;
}
}
catch (...)
{
isValid = false;
}
}
}
else
{
isValid = false;
}
if (!isValid)
{
throw TemplateException("Invalid IP address '" + ipAddr + "' specified", false);
}
m_values.emplace_back(ipAddr);
}
//////////////////////////////////////////////////////////////////////////
// Data classes
//////////////////////////////////////////////////////////////////////////
wstring Data::getvalue()
{
throw TemplateException("Data item is not a value") ;
}
token_vector & Token::get_children()
{
throw TemplateException("This token type cannot have children") ;
}
void Token::set_children( token_vector &children )
{
throw TemplateException("This token type cannot have children") ;
}
data_map& Data::getmap()
{
throw TemplateException("Data item is not a dictionary") ;
}
data_list& Data::getlist()
{
throw TemplateException("Data item is not a list") ;
}
void TokenEnd::gettext( std::wostream &, data_map &)
{
throw TemplateException("End-of-control statements have no associated text") ;
}
std::string Variables::doValueSubstitution(const std::string &value) const
{
//
// A value has the form {{name}}[{{index}}] where name and index can be simple strings and the index is optional
// Or {{name}}.size which will return the size of the variable name (number of entries)
std::string varName, result = value;
std::size_t index;
std::size_t bracesStartPos = result.find("{{");
bool done = bracesStartPos == std::string::npos;
while (!done)
{
index = m_curIndex;
std::size_t bracesEndPos = findClosingDelimiter(result, bracesStartPos,"{{", "}}");
varName = result.substr(bracesStartPos + 2, bracesEndPos - bracesStartPos - 2);
//
// If there is an index defined, evaluate it and update the index to be used for the final value
std::size_t bracketStartPos = result.find('[');
std::size_t sizePos = result.find(".size");
if (bracketStartPos != std::string::npos && sizePos != std::string::npos)
{
throw TemplateException("Both [] and .size may not appear in a variable");
}
if (bracketStartPos != std::string::npos)
{
std::size_t bracketEndPos = findClosingDelimiter(result, bracketStartPos, "[", "]"); // result.find(']');
std::string indexStr = result.substr(bracketStartPos+1, bracketEndPos - bracketStartPos - 1);
varName = result.substr(bracesStartPos + 2, bracketStartPos - bracesStartPos - 2);
try {
index = std::stoul(evaluate(doValueSubstitution(indexStr)));
} catch (...) {
throw TemplateException("Non-numeric count found for index value", false);
}
}
if (sizePos != std::string::npos)
{
result = std::to_string(getVariable(varName, true)->getNumValues());
}
else
{
std::string substitueValue = doValueSubstitution(getVariable(varName, true)->getValue(index));
std::string newResult = result.substr(0, bracesStartPos);
newResult += substitueValue;
newResult += result.substr(bracesEndPos + 2);
result = newResult;
}
bracesStartPos = result.find("{{");
done = bracesStartPos == std::string::npos;
}
//
// This should NOT have a [] in it
return evaluate(result);
}
