com.whitestein.lsps.lang.operation

Class ExpressionOperation

java.lang.Object

com.whitestein.lsps.lang.operation.ExpressionOperation

All Implemented Interfaces:

Operation

public class ExpressionOperation
extends Object
implements Operation

Operation implemented by given expression. The expression can have free types. During each execution, the free types are substituted with the actual argument types.

Author:

rba

Constructor Summary

Constructors

Constructor and Description
ExpressionOperation(FunctionSignature signature, Expression expression, ExpressionOrigin origin) Creates new instance of ExpressionOperation.

Method Summary

Modifier and Type	Method and Description
Object	execute(Interpreter interpreter, List<Expression> args, boolean variadicArgAsList, InterpreterStackTrace stackTrace) Executes the expression.
Expression	getExpression() Returns the underlying expression.
ExpressionOrigin	getOrigin() Returns the expression origin.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionOperation

public ExpressionOperation(FunctionSignature signature,
                           Expression expression,
                           ExpressionOrigin origin)

Creates new instance of ExpressionOperation.

Parameters:

signature -

expression -

origin - the expression origin

Method Detail

toString

public String toString()

Overrides:

toString in class Object

execute

public Object execute(Interpreter interpreter,
                      List<Expression> args,
                      boolean variadicArgAsList,
                      InterpreterStackTrace stackTrace)
               throws ErrorException

Description copied from interface: Operation

Executes the expression. The operation gets the interpreter and argument expressions instead of getting evaluated arguments. This can be used for late argument evaluation or not evaluating them at all.

Specified by:

execute in interface Operation

variadicArgAsList - if true, the variadic argument is given as expression returning a list; if false, the variadic argument is given as several individual expressions

stackTrace - a stack trace passed to the interpreter

Returns:

the result of the operation

Throws:

ErrorException

getExpression

public Expression getExpression()

Returns the underlying expression.

Returns:

the expression

getOrigin

public ExpressionOrigin getOrigin()

Returns the expression origin.

Returns:

the expression origin