/**
* Constructor for function definition in natural math language,
* for instance providing on string "f(x,y) = sin(x) + cos(x)"
* is enough to define function "f" with parameters "x and y"
* and function body "sin(x) + cos(x)".
*
* @param functionDefinitionString Function definition in the form
* of one String, ie "f(x,y) = sin(x) + cos(x)"
* @param elements Optional elements list (variadic - comma separated)
* of types: Argument, Constant, Function
*
* @see PrimitiveElement
*
*/
public Function(String functionDefinitionString, params PrimitiveElement[] elements)
: base(Function.TYPE_ID)
{
parametersNumber = 0;
if (mXparser.regexMatch(functionDefinitionString, ParserSymbol.functionDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(functionDefinitionString);
this.functionName = headEqBody.headTokens[0].tokenStr;
functionExpression = new Expression(headEqBody.bodyStr, elements);
functionExpression.setDescription(headEqBody.headStr);
if (headEqBody.headTokens.Count > 1)
{
Token t;
for (int i = 1; i < headEqBody.headTokens.Count; i++)
{
t = headEqBody.headTokens[i];
if (t.tokenTypeId != ParserSymbol.TYPE_ID)
functionExpression.addArguments(new Argument(t.tokenStr));
}
}
parametersNumber = functionExpression.getArgumentsNumber() - countRecursiveArguments();
description = "";
addFunctions(this);
}
else {
functionExpression = new Expression();
functionExpression.setDescription(functionDefinitionString);
String errorMessage = ""; errorMessage = errorMessage + "\n [" + functionDefinitionString + "] " + "--> pattern not mathes: f(x1,...,xn) = ... reg exp: " + ParserSymbol.functionDefStrRegExp;
functionExpression.setSyntaxStatus(Expression.SYNTAX_ERROR_OR_STATUS_UNKNOWN, errorMessage);
}
}
/**
* Constructor - creates function from function name,
* function expression string and argument names.
*
* @param functionName the function name
* @param functionExpressionString the function expression string
* @param argumentsNames the arguments names (variadic parameters)
* comma separated list
*
* @see Expression
*/
public Function(String functionName
,String functionExpressionString
,params String[] argumentsNames)
: base(Function.TYPE_ID)
{
if (mXparser.regexMatch(functionName, ParserSymbol.nameOnlyTokenRegExp)) {
this.functionName = functionName;
functionExpression = new Expression(functionExpressionString);
functionExpression.setDescription(functionName);
foreach (String argName in argumentsNames)
functionExpression.addArguments(new Argument(argName));
parametersNumber = argumentsNames.Length - countRecursiveArguments();
description = "";
addFunctions(this);
}
else {
parametersNumber = 0;
description = "";
functionExpression = new Expression("");
functionExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + functionName + "]" + "Invalid function name, pattern not matches: " + ParserSymbol.nameTokenRegExp);
}
}
/*=================================================
*
* Constructors
*
*=================================================
*/
/**
* Constructor - creates function from function name
* and function expression string.
*
* @param functionName the function name
* @param functionExpressionString the function expression string
* @param elements Optional elements list (variadic - comma separated) of types: Argument, Constant, Function
*
* @see PrimitiveElement
* @see Expression
*/
public Function(String functionName
,String functionExpressionString, params PrimitiveElement[] elements)
: base(Function.TYPE_ID)
{
if (mXparser.regexMatch(functionName, ParserSymbol.nameOnlyTokenRegExp)) {
this.functionName = functionName;
functionExpression = new Expression(functionExpressionString, elements);
functionExpression.setDescription(functionName);
parametersNumber = 0;
description = "";
addFunctions(this);
}
else {
parametersNumber = 0;
description = "";
functionExpression = new Expression("");
functionExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + functionName + "]" + "Invalid function name, pattern not matches: " + ParserSymbol.nameTokenRegExp);
}
}
/**
* Gets recursive argument value
*
* @param index the index
*
* @return value as double
*/
public double getArgumentValue(double index)
{
/*
* Remember starting index
*/
if (recursiveCounter == -1)
startingIndex = (int)Math.Round(index);
int recSize = baseValues.Count;
int idx = (int)Math.Round(index);
/*
* Count recursive calls
*/
recursiveCounter++;
if ((recursiveCounter <= startingIndex) && (idx <= startingIndex)) {
/*
* if recursive counter is still lower than starting index
* and current index is not increasing
*/
if ((idx >= 0) && (idx < recSize) && (!Double.IsNaN( baseValues[idx] )) ) {
/*
* decrease recursive counter and return value
* if recursive value for the current index was already
* calculated and remembered in the base values table
*/
recursiveCounter--;
return baseValues[idx];
}
else if (idx >= 0) {
/*
* value is to be calculated by the recursive calls
*/
/*
* Set n to the current index
*/
n.setArgumentValue(idx);
/*
* create new expression
*/
Expression newExp = new Expression(
base.argumentExpression.expressionString
, base.argumentExpression.argumentsList
, base.argumentExpression.functionsList
, base.argumentExpression.constantsList
,Expression.INTERNAL);
newExp.setDescription(base.getArgumentName());
//newExp.setRecursiveMode();
if (base.getVerboseMode() == true)
{
//System.out.println(super.getVerboseMode() + ", " +super.getArgumentName() + ", " + super.argumentExpression.expressionString + "," + "VERBOSE MODE for recurssion");
newExp.setVerboseMode();
}
/*
* perform recursive call
*/
double value = newExp.calculate();
/*
* remember calculated in the base values array
*/
addBaseCase(idx, value);
/*
* decrease recursive counter and return value
*/
recursiveCounter--;
return value;
} else {
/*
* decrease recursive counter and
* return Double.NaN for negative index call
*/
recursiveCounter--;
return Double.NaN;
}
} else {
/* stop never ending loop
* decrease recursive counter and
* return Double.NaN
*/
recursiveCounter--;
return Double.NaN;
}
}
/**
* Constructor - creates dependent argument(with hidden
* argument expression).
*
* @param argumentName the argument name
* @param argumentExpressionString the argument expression string
* @param elements Optional parameters (comma separated)
* such as Arguments, Constants, Functions
*
* @see Expression
* @see PrimitiveElement
*/
public Argument(String argumentName, String argumentExpressionString, params PrimitiveElement[] elements)
: base(Argument.TYPE_ID)
{
if (mXparser.regexMatch(argumentName, ParserSymbol.nameOnlyTokenRegExp)) {
this.argumentName=String.Copy(argumentName);
argumentValue=ARGUMENT_INITIAL_VALUE;
argumentExpression = new Expression(argumentExpressionString, elements);
argumentExpression.setDescription(argumentName);
argumentType = DEPENDENT_ARGUMENT;
}
else {
this.argumentValue = ARGUMENT_INITIAL_VALUE;
argumentExpression = new Expression();
argumentExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + argumentName + "] " + "Invalid argument name, pattern not match: " + ParserSymbol.nameOnlyTokenRegExp);
}
setSilentMode();
description = "";
}
/*=================================================
*
* Constructors
*
*=================================================
*/
/**
* Default constructor - creates argument based on the argument definition string.
*
* @param argumentDefinitionString Argument definition string, i.e.:
* <ul>
* <li>'x' - only argument name
* <li>'x=5' - argument name and argument value
* <li>'x=2*5' - argument name and argument value given as simple expression
* <li>'x=2*y' - argument name and argument expression (dependent argument 'x' on argument 'y')
* </ul>
*
* @param elements Optional parameters (comma separated) such as Arguments, Constants, Functions
*/
public Argument(String argumentDefinitionString, params PrimitiveElement[] elements)
: base(Argument.TYPE_ID)
{
if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.nameOnlyTokenRegExp)) {
argumentName = argumentDefinitionString;
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = FREE_ARGUMENT;
argumentExpression = new Expression(elements);
}
else if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.constArgDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(argumentDefinitionString);
argumentName = headEqBody.headTokens[0].tokenStr;
Expression bodyExpr = new Expression(headEqBody.bodyStr);
double bodyValue = bodyExpr.calculate();
if ((bodyExpr.getSyntaxStatus() == Expression.NO_SYNTAX_ERRORS) && (bodyValue != Double.NaN)) {
argumentExpression = new Expression();
argumentValue = bodyValue;
argumentType = FREE_ARGUMENT;
}
else {
argumentExpression = bodyExpr;
addDefinitions(elements);
argumentType = DEPENDENT_ARGUMENT;
}
}
else if (mXparser.regexMatch(argumentDefinitionString, ParserSymbol.functionDefStrRegExp)) {
HeadEqBody headEqBody = new HeadEqBody(argumentDefinitionString);
argumentName = headEqBody.headTokens[0].tokenStr;
argumentExpression = new Expression(headEqBody.bodyStr, elements);
argumentExpression.setDescription(headEqBody.headStr);
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = DEPENDENT_ARGUMENT;
n = new Argument(headEqBody.headTokens[2].tokenStr);
}
else {
argumentValue = ARGUMENT_INITIAL_VALUE;
argumentType = FREE_ARGUMENT;
argumentExpression = new Expression();
argumentExpression.setSyntaxStatus(SYNTAX_ERROR_OR_STATUS_UNKNOWN, "[" + argumentDefinitionString + "] " + "Invalid argument definition (patterns: 'x', 'x=5', 'x=5+3/2', 'x=2*y').");
}
setSilentMode();
description = "";
}
