isc::dhcp::ExpressionParser Class Reference

Parser for a logical expression. More...

#include <client_class_def_parser.h>

Inheritance diagram for isc::dhcp::ExpressionParser:

Public Member Functions
void	parse (ExpressionPtr &expression, isc::data::ConstElementPtr expression_cfg, uint16_t family, isc::eval::EvalContext::CheckDefined check_defined=isc::eval::EvalContext::acceptAll, isc::eval::EvalContext::ParserType parser_type=isc::eval::EvalContext::PARSER_BOOL)
	Parses an expression configuration element into an Expression.
Public Member Functions inherited from isc::data::SimpleParser
uint16_t	getUint16 (isc::data::ConstElementPtr scope, const std::string &name)
	Returns a value converted to uint16_t.
uint32_t	getUint32 (isc::data::ConstElementPtr scope, const std::string &name)
	Returns a value converted to uint32_t.
uint8_t	getUint8 (ConstElementPtr scope, const std::string &name)
	Get an uint8_t value.
const isc::util::Triplet< uint32_t >	parseIntTriplet (const data::ConstElementPtr &scope, const std::string &name)
	Parses an integer triplet.

Additional Inherited Members
Static Public Member Functions inherited from isc::data::SimpleParser
static void	checkKeywords (const SimpleKeywords &keywords, isc::data::ConstElementPtr scope)
	Checks acceptable keywords with their expected type.
static void	checkRequired (const SimpleRequiredKeywords &required, isc::data::ConstElementPtr scope)
	Checks that all required keywords are present.
static size_t	deriveParams (isc::data::ConstElementPtr parent, isc::data::ElementPtr child, const ParamsList &params)
	Derives (inherits) parameters from parent scope to a child.
static isc::asiolink::IOAddress	getAddress (const ConstElementPtr &scope, const std::string &name)
	Returns a IOAddress parameter from a scope.
static bool	getBoolean (isc::data::ConstElementPtr scope, const std::string &name)
	Returns a boolean parameter from a scope.
static double	getDouble (const ConstElementPtr &scope, const std::string &name)
	Returns a floating point parameter from a scope.
static int64_t	getInteger (isc::data::ConstElementPtr scope, const std::string &name)
	Returns an integer parameter from a scope.
static int64_t	getInteger (isc::data::ConstElementPtr scope, const std::string &name, int64_t min, int64_t max)
	Returns an integer parameter from a scope and checks its range.
static const data::Element::Position &	getPosition (const std::string &name, const data::ConstElementPtr parent)
	Utility method that returns position of an element.
static std::string	getString (isc::data::ConstElementPtr scope, const std::string &name)
	Returns a string parameter from a scope.
static size_t	setDefaults (isc::data::ElementPtr scope, const SimpleDefaults &default_values)
	Sets the default values.
static size_t	setListDefaults (isc::data::ConstElementPtr list, const SimpleDefaults &default_values)
	Sets the default values for all entries in a list.
Protected Member Functions inherited from isc::data::SimpleParser
template<typename target_type , target_type convert>
target_type	getAndConvert (isc::data::ConstElementPtr scope, const std::string &name, const std::string &type_name)
	Returns a converted value from a scope.
template<typename int_type >
int_type	getIntType (isc::data::ConstElementPtr scope, const std::string &name)
	Returns an integer value with range checking from a scope.

Detailed Description

Parser for a logical expression.

This parser creates an instance of an Expression from a string. The string is passed to the Eval Parser and the resultant Expression is stored into the ExpressionPtr reference passed into the constructor.

Definition at line 63 of file client_class_def_parser.h.

Member Function Documentation

parse()

void isc::dhcp::ExpressionParser::parse	(	ExpressionPtr &	expression,
		isc::data::ConstElementPtr	expression_cfg,
		uint16_t	family,
		isc::eval::EvalContext::CheckDefined	check_defined = isc::eval::EvalContext::acceptAll,
		isc::eval::EvalContext::ParserType	parser_type = isc::eval::EvalContext::PARSER_BOOL
	)

Parses an expression configuration element into an Expression.

Parameters

expression	variable in which to store the new expression
expression_cfg	the configuration entry to be parsed.
family	the address family of the expression.
check_defined	a closure to check if a client class is defined.
parser_type	the expected type of the evaluated expression.

Exceptions

DhcpConfigError

if parsing was unsuccessful.

Definition at line 37 of file client_class_def_parser.cc.

References isc::eval::EvalContext::expression, isc_throw, isc::eval::EvalContext::PARSER_STRING, isc::eval::EvalContext::parseString(), isc::data::Element::string, isc::dhcp::Option::V4, isc::dhcp::Option::V6, and isc::Exception::what().

Referenced by isc::dhcp::ClientClassDictionary::initMatchExpr(), and isc::dhcp::ClientClassDefParser::parse().

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The documentation for this class was generated from the following files:

• client_class_def_parser.h
• client_class_def_parser.cc