Class ExpressionParser

java.lang.Object

org.episteme.core.mathematics.symbolic.parsing.ExpressionParser

public class ExpressionParser
extends Object

Expression parser for mathematical text.

Parses strings like "sin(x) + 2*y^2" into evaluable expressions. Supports automatic differentiation.

Since:

1.0

Author:

Silvere Martin-Michiellot, Gemini AI (Google DeepMind)

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ExpressionParser.BinaryOp	Binary operation: +, -, *, /, ^
static class	ExpressionParser.Const	Constant value.
static interface	ExpressionParser.Expr	Base interface for parsed expressions.
static class	ExpressionParser.FuncCall	Function call: sin, cos, tan, exp, log, sqrt, abs
static class	ExpressionParser.Negate	Unary negation.
static class	ExpressionParser.Var	Variable reference.

Constructor Summary

Constructors

Constructor	Description
ExpressionParser()

Method Summary

Modifier and Type	Method	Description
static ExpressionParser.Expr	derivative(String expression, String variable)	Compute derivative symbolically.
static double	eval(String expression, Map<String,Double> variables)	Quick evaluation of an expression.
static Map<String, ExpressionParser.Expr>	gradient(String expression, String... variables)	Compute gradient for all variables.
static double	numericalDerivative(String expression, String variable, Map<String,Double> point, double h)	Compute numerical derivative using central difference.
static ExpressionParser.Expr	parse(String expression)	Parse a mathematical expression string.
static ExpressionParser.Expr	simplify(ExpressionParser.Expr e)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ExpressionParser

public ExpressionParser()

Method Details

parse

public static ExpressionParser.Expr parse(String expression)

Parse a mathematical expression string.

Parameters:

expression - Text like "x^2 + sin(y)"

Returns:

Parsed expression node

simplify

public static ExpressionParser.Expr simplify(ExpressionParser.Expr e)

eval

public static double eval(String expression,
 Map<String,Double> variables)

Quick evaluation of an expression.

derivative

public static ExpressionParser.Expr derivative(String expression,
 String variable)

Compute derivative symbolically.

numericalDerivative

public static double numericalDerivative(String expression,
 String variable,
 Map<String,Double> point,
 double h)

Compute numerical derivative using central difference.

gradient

public static Map<String, ExpressionParser.Expr> gradient(String expression,
 String... variables)

Compute gradient for all variables.