com.wewebu.expression.language

Class OwExprFunctionSymbol

java.lang.Object

com.wewebu.expression.language.OwExprSymbol

com.wewebu.expression.language.OwExprFunctionSymbol

public class OwExprFunctionSymbol
extends OwExprSymbol

Function symbols represent symbol table recordings of function pointing symbols in the expressions.

fun(1,2,3)

Creates function symbol for the fun identifier

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Field Summary

Fields inherited from class com.wewebu.expression.language.OwExprSymbol

m_parent

Constructor Summary

Constructors

Constructor and Description
OwExprFunctionSymbol(OwExprSymbol parent_p, String name_p, OwExprType[] types_p)

Method Summary

Methods

Modifier and Type	Method and Description
OwExprValue	getValue(OwExprScope scope_p, OwExprValue[] arguments_p) Returns a value produced by the invocation of the function represented by this symbol.
boolean	matches(OwExprScope scope_p) A match method used to check the validity of symbols for certain scopes. Can be used to discover symbol and related expressions validity before evaluation.
void	setArgumentTypes(OwExprExpressionType[] argumentTypes_p)
void	setSymbolScope(OwExprSymbolScope symbolScope_p)
protected void	toPrettyPrintString(StringBuffer sb_p, StringBuffer tabs_p) Pretty-print utility

Methods inherited from class com.wewebu.expression.language.OwExprSymbol

addAnonymousSymbol, addFunctionSymbol, addPropertySymbol, getName, getSymbol, getSymbolFQN, getSymbolTable, getType, issueRuntimeSymbolName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

OwExprFunctionSymbol

public OwExprFunctionSymbol(OwExprSymbol parent_p,
                    String name_p,
                    OwExprType[] types_p)

Method Detail

setArgumentTypes

public final void setArgumentTypes(OwExprExpressionType[] argumentTypes_p)

Parameters:

argumentTypes_p - the argument expressions types that this function should use to discover the function binding in the scope at evaluation time

getValue

public final OwExprValue getValue(OwExprScope scope_p,
                   OwExprValue[] arguments_p)
                           throws OwExprEvaluationException

Returns a value produced by the invocation of the function represented by this symbol.

Parameters:

scope_p - the top level scope on which this function is evaluated.

arguments_p - the value of the arguments used to invoke the function

Returns:

the value resulted from the functions invocation

Throws:

OwExprEvaluationException

toPrettyPrintString

protected void toPrettyPrintString(StringBuffer sb_p,
                       StringBuffer tabs_p)

Pretty-print utility

Overrides:

toPrettyPrintString in class OwExprSymbol

Parameters:

sb_p -

tabs_p -

setSymbolScope

public final void setSymbolScope(OwExprSymbolScope symbolScope_p)

Parameters:

symbolScope_p - the functions parent scope setter

matches

public boolean matches(OwExprScope scope_p)

Description copied from class: OwExprSymbol

A match method used to check the validity of symbols for certain scopes.
Can be used to discover symbol and related expressions validity before evaluation.

Specified by:

matches in class OwExprSymbol

Parameters:

scope_p - a scope to search the symbol on

Returns:

true if this symbol is valid for the given scope