info.bliki.wiki.template.expr.eval

Class DoubleEvaluator

java.lang.Object

info.bliki.wiki.template.expr.eval.DoubleEvaluator

public class DoubleEvaluator
extends Object

Evaluate math expressions to double numbers. Use the expression syntax describe here: https://meta.wikimedia.org/wiki/Help:ParserFunctions#.23expr:

Field Summary

Fields

Modifier and Type	Field and Description
static double	EPSILON A "close to zero" double epsilon value for use to compare with 0.0
static double	EPSILON_ROUND A "close to zero" double epsilon value for use in the Round function

Constructor Summary

Constructors

Constructor and Description
DoubleEvaluator()
DoubleEvaluator(ASTNode node)

Method Summary

Modifier and Type	Method and Description
double	evalStep(String expression)
double	evaluate() Reevaluate the expression (possibly after a new Variable assignment)
double	evaluate(String expression) Parse the given expression String and evaluate it to a double value
double	evaluateFunction(FunctionNode functionNode) Evaluate an already parsed in FunctionNode into a souble number value.
boolean	evaluateFunctionLogical(FunctionNode functionNode)
double	evaluateNode(ASTNode node) Evaluate an already parsed in abstract syntax tree node into a double number value.
boolean	evaluateNodeLogical(ASTNode node)
ASTNode	optimizeFunction(FunctionNode functionNode) Optimize an already parsed in functionNode into an ASTNode.
ASTNode	parse(String expression) Parse the given expression String and store the resulting ASTNode in this DoubleEvaluator
static ASTNode	parseNode(String expression) Parse the given expression String and return the resulting ASTNode

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON

public static double EPSILON

A "close to zero" double epsilon value for use to compare with 0.0

EPSILON_ROUND

public static double EPSILON_ROUND

A "close to zero" double epsilon value for use in the Round function

Constructor Detail

DoubleEvaluator

public DoubleEvaluator()

DoubleEvaluator

public DoubleEvaluator(ASTNode node)

Method Detail

parse

public ASTNode parse(String expression)

Parse the given expression String and store the resulting ASTNode in this DoubleEvaluator

Parameters:

expression -

Returns:

Throws:

SyntaxError

parseNode

public static ASTNode parseNode(String expression)

Parse the given expression String and return the resulting ASTNode

Parameters:

expression -

Returns:

Throws:

SyntaxError

evalStep

public double evalStep(String expression)

evaluate

public double evaluate(String expression)

Parse the given expression String and evaluate it to a double value

Parameters:

expression -

Returns:

Throws:

SyntaxError

evaluate

public double evaluate()

Reevaluate the expression (possibly after a new Variable assignment)

Parameters:

expression -

Returns:

Throws:

SyntaxError

evaluateNode

public double evaluateNode(ASTNode node)

Evaluate an already parsed in abstract syntax tree node into a double number value.

Parameters:

node - abstract syntax tree node

Returns:

the evaluated double number

Throws:

ArithmeticException - if the node cannot be evaluated.

evaluateFunction

public double evaluateFunction(FunctionNode functionNode)

Evaluate an already parsed in FunctionNode into a souble number value.

Parameters:

functionNode -

Returns:

Throws:

ArithmeticException - if the functionNode cannot be evaluated.

evaluateNodeLogical

public boolean evaluateNodeLogical(ASTNode node)

evaluateFunctionLogical

public boolean evaluateFunctionLogical(FunctionNode functionNode)

optimizeFunction

public ASTNode optimizeFunction(FunctionNode functionNode)

Optimize an already parsed in functionNode into an ASTNode.

Parameters:

functionNode -

Returns: