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Ionflux::Tools::TreeEval Class Reference
[Data handling]

Tree expression evaluator. More...

#include <TreeEval.hpp>

Collaboration diagram for Ionflux::Tools::TreeEval:

[legend]List of all members.

Public Member Functions
	TreeEval ()
	Constructor.
virtual	~TreeEval ()
	Destructor.
Static Public Member Functions
static bool	parseTreeExpr (const std::string &treeExpr, std::vector< TreeExprElement > &elements)
	Parse tree expression.
static bool	eval (Tree *tree, std::vector< TreeExprElement > &elements, Node &result, bool createPath)
	Evaluate tree expression.
Static Public Attributes
static const TokenType	TT_OPERATOR
	Token type: Operators.
static const TokenType	TT_TREEPATH_NP
	Token type: Tree path (excluding parentheses).
static const TokenType	TT_PAR_LEFT
	Token type: Parenthesis (left).
static const TokenType	TT_PAR_RIGHT
	Token type: Parenthesis (right).
Static Protected Member Functions
static bool	calculate (DataEntry &op1, DataEntry &result, const std::string &op)
	Perform calculation.
static bool	calculate (DataEntry &op1, DataEntry &op2, DataEntry &result, const std::string &op)
	Perform calculation.
static bool	unwindOpStack (std::stack< TreeExprElement > &ops, std::stack< TreeExprElement > &values, Tree &temps, bool unwindPar=false)
	Unwind operator stack.

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Detailed Description

Tree expression evaluator.

Evaluates expressions in which tree paths are used as variables.

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Constructor & Destructor Documentation

Ionflux::Tools::TreeEval::TreeEval (   )

Constructor. Construct new TreeEval object.

Ionflux::Tools::TreeEval::~TreeEval (   )  [virtual]

Destructor. Destruct TreeEval object.

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Member Function Documentation

bool Ionflux::Tools::TreeEval::calculate (  DataEntry &  op1, DataEntry &  op2, DataEntry &  result, const std::string &  op )  [static, protected]

Perform calculation. Performs a calculation using the specified binary operator. Parameters: op1  First operand. op2  Second operand. result  Data entry to store the result in. op  Unary operator. Returns: true on success, false if there was an error.

bool Ionflux::Tools::TreeEval::calculate (  DataEntry &  op1, DataEntry &  result, const std::string &  op )  [static, protected]

Perform calculation. Performs a calculation using the specified unary operator. Parameters: op1  Operand. result  Data entry to store the result in. op  Unary operator. Returns: true on success, false if there was an error.

bool Ionflux::Tools::TreeEval::eval (  Tree *  tree, std::vector< TreeExprElement > &  elements, Node &  result, bool  createPath )  [static]

Evaluate tree expression. Evaluates a tree expression for a specified tree and a set of tree expression elements. Pass true to createPath to create tree paths on the fly if it they do not already exist. Parameters: tree  Tree for which the expression should be evaluated. elements  Tree expression elements to evaluate. result  Where to store the result of the evaluation. createPath  Whether to create a path if it does not already exist. Returns: true on success, false if there was an error.

bool Ionflux::Tools::TreeEval::parseTreeExpr (  const std::string &  treeExpr, std::vector< TreeExprElement > &  elements )  [static]

Parse tree expression. Parse a tree expression into tree expression elements. Parameters: treeExpr  Tree expression. elements  Vector in which to store tree expression elements. Returns: true on success, false if there was an error.

bool Ionflux::Tools::TreeEval::unwindOpStack (  std::stack< TreeExprElement > &  ops, std::stack< TreeExprElement > &  values, Tree &  temps, bool  unwindPar = false )  [static, protected]

Unwind operator stack. Unwinds an operator stack by processing the topmost element, or all operators until either the stack is empty or a left parenthesis is found. The result of the operation is put on top of the value stack. Parameters: ops  Operator stack. values  Value stack. temps  Tree in which to store temporary values. unwindPar  Whether to unwind the stack until it is empty or a left parenthesis is found. Returns: true on success, false if there was an error.

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Member Data Documentation

const TokenType Ionflux::Tools::TreeEval::TT_OPERATOR [static]

Initial value: { TokenType::USERTYPE_ID + 201, "+-*/=<>&|!~%^", false, 0} Token type: Operators.

const TokenType Ionflux::Tools::TreeEval::TT_PAR_LEFT [static]

Initial value: { TokenType::USERTYPE_ID + 203, "(", false, 1} Token type: Parenthesis (left).

const TokenType Ionflux::Tools::TreeEval::TT_PAR_RIGHT [static]

Initial value: { TokenType::USERTYPE_ID + 204, ")", false, 1} Token type: Parenthesis (right).

const TokenType Ionflux::Tools::TreeEval::TT_TREEPATH_NP [static]

Initial value: { TokenType::USERTYPE_ID + 202, ".[]", false, 0} Token type: Tree path (excluding parentheses).

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

• TreeEval.hpp
• TreeEval.cpp

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