hipo::Parser Class Reference

Mathematical expression parser and evaluator. More...

#include <parser.h>

Public Types
enum	TokenType {   NONE , NAME , NUMBER , END ,   PLUS ='+' , MINUS ='-' , MULTIPLY ='*' , DIVIDE ='/' ,   ASSIGN ='=' , LHPAREN ='(' , RHPAREN =')' , COMMA =',' ,   NOT ='!' , LT ='<' , GT ='>' , LE ,   GE , EQ , NE , AND ,   OR , ASSIGN_ADD , ASSIGN_SUB , ASSIGN_MUL ,   ASSIGN_DIV }
	Token types used by the expression lexer. More...

Public Member Functions
	Parser (const std::string &program)
	Construct a parser with the given expression. More...
const double	Evaluate ()
	Evaluate the stored expression using current symbol values. More...
const double	Evaluate (const std::string &program)
	Evaluate a new expression using current symbol values. More...
double &	operator[] (const std::string &key)
	Access or create a symbol (variable) by name. More...

Public Attributes
std::map< std::string, double >	symbols_
	Symbol table mapping variable names to values. Can be accessed directly. More...

Detailed Description

Mathematical expression parser and evaluator.

Parses and evaluates arithmetic expressions with support for variables, comparisons, logical operators, and standard math functions. Used internally by hipo::bank::rowlist::filter for expression-based filtering.

hipo::Parser p("px*px + py*py");
p["px"] = 0.5;
p["py"] = 0.3;
double result = p.Evaluate();

Definition at line 42 of file parser.h.

Member Enumeration Documentation

TokenType

enum hipo::Parser::TokenType

Token types used by the expression lexer.

Represents all possible token categories including literals (NUMBER, NAME), operators (arithmetic, comparison, logical), and delimiters.

Enumerator
NONE	No token (error state)
NAME	Identifier or variable name.
NUMBER	Numeric literal.
END	End of expression.
PLUS	Addition operator.
MINUS	Subtraction operator.
MULTIPLY	Multiplication operator.
DIVIDE	Division operator.
ASSIGN	Assignment operator.
LHPAREN	Left parenthesis.
RHPAREN	Right parenthesis.
COMMA	Comma delimiter.
NOT	Logical NOT operator.
LT	Less than comparison.
GT	Greater than comparison.
LE	Less than or equal (<=)
GE	Greater than or equal (>=)
EQ	Equal comparison (==)
NE	Not equal comparison (!=)
AND	Logical AND (&&)
OR	Logical OR (||)
ASSIGN_ADD	Compound assignment (+=)
ASSIGN_SUB	Compound assignment (-=)
ASSIGN_MUL	Compound assignment (*=)
ASSIGN_DIV	Compound assignment (/=)

Definition at line 53 of file parser.h.

Constructor & Destructor Documentation

Parser()

hipo::Parser::Parser ( const std::string &  program )

inline

Construct a parser with the given expression.

Parameters

program

The mathematical expression to parse

Definition at line 100 of file parser.h.

Member Function Documentation

Evaluate() [1/2]

const double hipo::Parser::Evaluate

(

)

Evaluate the stored expression using current symbol values.

Returns

The result of the expression

Definition at line 653 of file parser.cpp.

Evaluate() [2/2]

const double hipo::Parser::Evaluate

(

const std::string &

program

)

Evaluate a new expression using current symbol values.

Parameters

program

Expression string to evaluate

Returns

The result of the expression

Definition at line 664 of file parser.cpp.

operator[]()

double& hipo::Parser::operator[] ( const std::string &  key )

inline

Access or create a symbol (variable) by name.

Parameters

key	Variable name

Returns

Reference to the variable's value

Definition at line 119 of file parser.h.

Member Data Documentation

symbols_

std::map<std::string, double> hipo::Parser::symbols_

Symbol table mapping variable names to values. Can be accessed directly.

Definition at line 122 of file parser.h.

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

• hipo4/parser.h
• hipo4/parser.cpp