Package redempt.crunch.functional

Class ExpressionEnv

java.lang.Object

redempt.crunch.functional.ExpressionEnv

Direct Known Subclasses:

EvaluationEnvironment

public class ExpressionEnv
extends Object

Represents an environment containing functions that can be called in expressions

Constructor Summary

Constructors

Constructor	Description
ExpressionEnv()	Creates a new EvaluationEnvironment

Method Summary

Modifier and Type	Method	Description
ExpressionEnv	addFunction(String name, int argCount, ToDoubleFunction<double[]> func)	Adds a Function that can be called from expressions with this environment
ExpressionEnv	addFunction(Function function)	Adds a Function that can be called from expressions with this environment
ExpressionEnv	addFunctions(Function... functions)	Adds any number of Functions that can be called from expressions with this environment
ExpressionEnv	addLazyVariable(String name, DoubleSupplier supply)	Adds a lazily-evaluated variable that will not need to be passed with the variable values
CharTree<BinaryOperator>	getBinaryOperators()
CharTree<Token>	getLeadingOperators()
CharTree<Value>	getValues()
int	getVariableCount()
ExpressionEnv	setVariableNames(String... names)

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionEnv

public ExpressionEnv()

Creates a new EvaluationEnvironment

Method Details

addFunction

public ExpressionEnv addFunction(Function function)

Adds a Function that can be called from expressions with this environment

Parameters:

function - The function

addFunctions

public ExpressionEnv addFunctions(Function... functions)

Adds any number of Functions that can be called from expressions with this environment

Parameters:

functions - The functions to add

addLazyVariable

public ExpressionEnv addLazyVariable(String name,
 DoubleSupplier supply)

Adds a lazily-evaluated variable that will not need to be passed with the variable values

Parameters:

name - The name of the lazy variable

supply - A function to supply the value of the variable when needed

setVariableNames

public ExpressionEnv setVariableNames(String... names)

addFunction

public ExpressionEnv addFunction(String name,
 int argCount,
 ToDoubleFunction<double[]> func)

Adds a Function that can be called from expressions with this environment

Parameters:

name - The function name

argCount - The argument count for the function

func - The lambda to accept the arguments as a double array and return a value

getLeadingOperators

public CharTree<Token> getLeadingOperators()

Returns:

The prefix tree of all leading operators, including unary operators and functions

getBinaryOperators

public CharTree<BinaryOperator> getBinaryOperators()

Returns:

The prefix tree of all binary operators

getValues

public CharTree<Value> getValues()

Returns:

The prefix tree of all values, including constants, variables, and lazy variables

getVariableCount

public int getVariableCount()

Returns:

The number of variables in this expression environment