com.caucho.quercus.expr
Class AbstractVarExpr

java.lang.Object
  com.caucho.quercus.expr.Expr
      com.caucho.quercus.expr.AbstractVarExpr

Direct Known Subclasses:

ArrayGetExpr, ArrayTailExpr, BinaryCharAtExpr, ClassFieldExpr, ClassFieldVarExpr, ClassVarFieldExpr, ClassVarFieldVarExpr, ClassVirtualFieldExpr, ClassVirtualFieldVarExpr, ObjectFieldExpr, ObjectFieldVarExpr, ThisExpr, ThisFieldExpr, ThisFieldVarExpr, VarExpr, VarVarExpr

public abstract class AbstractVarExpr
extends Expr

Represents an expression that is assignable

Field Summary

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

COMPILE_ARG_MAX

Constructor Summary

AbstractVarExpr()

AbstractVarExpr(Location location)

Method Summary

void	assign(QuercusParser parser) Marks the value as assigned
Expr	createAssign(QuercusParser parser, Expr value) Creates the assignment.
Expr	createAssignRef(QuercusParser parser, Expr value) Creates the assignment.
Expr	createCopy(ExprFactory factory) Creates the copy.
Expr	createRef(QuercusParser parser) Creates the reference
Statement	createUnset(ExprFactory factory, Location location) Creates the assignment.
abstract Value	eval(Env env) Evaluates the expression, returning a Value.
Value	evalArg(Env env, boolean isTop) Evaluates the expression as an argument.
Value	evalArray(Env env) Evaluates the expression as an array.
abstract Value	evalAssignRef(Env env, Value value) Assign the variable with a new reference value.
Value	evalAssignValue(Env env, Value value) Evaluates the expression.
Value	evalCopy(Env env) Evaluates the expression and copies the result for an assignment.
Value	evalObject(Env env) Evaluates the expression as an object.
Value	evalRef(Env env) Evaluates the expression as a reference when possible.
abstract void	evalUnset(Env env) Evaluates the expression as an argument.
abstract Var	evalVar(Env env) Evaluates the expression as a reference (by RefExpr).
boolean	isVar() Returns true if the expression is a var/left-hand-side.

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

canRead, createAssignFrom, createCall, createClassConst, createClassField, createClassField, createDeref, createFieldGet, createFieldGet, createIsset, evalArgs, evalArrayAssign, evalBoolean, evalChar, evalConstant, evalConstantPrefix, evalConstantSuffix, evalDirty, evalDouble, evalIsset, evalLong, evalPostIncrement, evalPreIncrement, evalString, evalStringValue, evalTop, evalUnsetArray, evalValue, getFileName, getFunctionLocation, getLine, getLocation, getLocationLine, isArray, isAssign, isBoolean, isConstant, isDouble, isFalse, isLiteral, isLong, isNumber, isRef, isString, isTrue, print, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractVarExpr

public AbstractVarExpr(Location location)

AbstractVarExpr

public AbstractVarExpr()

Method Detail

isVar

public boolean isVar()

Returns true if the expression is a var/left-hand-side.

Overrides:

isVar in class Expr

assign

public void assign(QuercusParser parser)

Marks the value as assigned

Overrides:

assign in class Expr

createAssign

public Expr createAssign(QuercusParser parser,
                         Expr value)

Creates the assignment.

Overrides:

createAssign in class Expr

createAssignRef

public Expr createAssignRef(QuercusParser parser,
                            Expr value)

Creates the assignment.

Overrides:

createAssignRef in class Expr

createRef

public Expr createRef(QuercusParser parser)

Creates the reference

Overrides:

createRef in class Expr

Parameters:

location -

createCopy

public Expr createCopy(ExprFactory factory)

Creates the copy.

Overrides:

createCopy in class Expr

Parameters:

location -

createUnset

public Statement createUnset(ExprFactory factory,
                             Location location)

Creates the assignment.

Overrides:

createUnset in class Expr

eval

public abstract Value eval(Env env)

Evaluates the expression, returning a Value.

Specified by:

eval in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalVar

public abstract Var evalVar(Env env)

Evaluates the expression as a reference (by RefExpr).

Overrides:

evalVar in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalRef

public Value evalRef(Env env)

Evaluates the expression as a reference when possible.

Overrides:

evalRef in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalArg

public Value evalArg(Env env,
                     boolean isTop)

Evaluates the expression as an argument.

Overrides:

evalArg in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalCopy

public Value evalCopy(Env env)

Evaluates the expression and copies the result for an assignment.

Overrides:

evalCopy in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalArray

public Value evalArray(Env env)

Evaluates the expression as an array.

Overrides:

evalArray in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalObject

public Value evalObject(Env env)

Evaluates the expression as an object.

Overrides:

evalObject in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalUnset

public abstract void evalUnset(Env env)

Evaluates the expression as an argument.

Parameters:

env - the calling environment.

evalAssignValue

public Value evalAssignValue(Env env,
                             Value value)

Evaluates the expression.

Overrides:

evalAssignValue in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.

evalAssignRef

public abstract Value evalAssignRef(Env env,
                                    Value value)

Assign the variable with a new reference value.

Overrides:

evalAssignRef in class Expr

Parameters:

env - the calling environment.

Returns:

the expression value.