com.caucho.quercus.expr

Class LiteralNullExpr

java.lang.Object

com.caucho.quercus.expr.Expr

com.caucho.quercus.expr.LiteralNullExpr

public class LiteralNullExpr
extends Expr

Represents a PHP null expression.

Field Summary

Fields

Modifier and Type	Field and Description
static LiteralNullExpr	NULL

Fields inherited from class com.caucho.quercus.expr.Expr

COMPILE_ARG_MAX, NULL_ARGS

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	LiteralNullExpr()

Method Summary

Modifier and Type	Method and Description
Value	eval(Env env) Evaluates the expression.
Value	evalConstant() Evaluates the expression as a constant.
boolean	isLiteral() Returns true for a literal expression.
java.lang.String	toString()

Methods inherited from class com.caucho.quercus.expr.Expr

assign, canRead, createAssign, createAssignFrom, createAssignRef, createCall, createClassConst, createClassConst, createClassField, createClassField, createCopy, createDeref, createFieldGet, createFieldGet, createIsset, createRef, createUnset, equals, evalArg, evalArgs, evalArray, evalArrayAssign, evalArrayAssignRef, evalArrayAssignRef, evalArrayAssignTail, evalAssignRef, evalAssignRef, evalAssignValue, evalAssignValue, evalBoolean, evalChar, evalConstantPrefix, evalConstantSuffix, evalCopy, evalDirty, evalDouble, evalEmpty, evalIsset, evalIssetValue, evalLong, evalObject, evalPostIncrement, evalPreIncrement, evalQuercusClass, evalRef, evalString, evalStringValue, evalTop, evalUnsetArray, evalValue, evalVar, getFileName, getFunctionLocation, getLine, getLocation, getLocationLine, isArray, isAssign, isBoolean, isConstant, isDouble, isFalse, isLong, isNumber, isRef, isString, isTrue, isVar, print

Methods inherited from class java.lang.Object

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

Field Detail

NULL

public static final LiteralNullExpr NULL

Constructor Detail

LiteralNullExpr

protected LiteralNullExpr()

Method Detail

evalConstant

public Value evalConstant()

Evaluates the expression as a constant.

Overrides:

evalConstant in class Expr

Returns:

the expression value.

isLiteral

public boolean isLiteral()

Returns true for a literal expression.

Overrides:

isLiteral in class Expr

eval

public Value eval(Env env)

Evaluates the expression.

Specified by:

eval in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

toString

public java.lang.String toString()

Overrides:

toString in class Expr