edu.mit.ai.psg.jeva
Class JNSExpressionStatement

java.lang.Object
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  +--edu.mit.ai.psg.jeva.SimpleNode
        |
        +--edu.mit.ai.psg.jeva.JevaNode
              |
              +--edu.mit.ai.psg.jeva.JNSExpressionStatement

public class JNSExpressionStatement

extends JevaNode

implements IStatementNode

Jeva parse Node for expression statements "(expr);".

Fields inherited from class edu.mit.ai.psg.jeva.SimpleNode

children, id, parent

Method Summary

IEnv	eval(IEnv env) Evaluate this Statement; don't call this directly, use EvalMethods.eval(IStatementNode, IEnv) Every statement needs to implement an eval method.
IExpressionNode	getExpression()
Object	jjtAccept(IJevaVisitor visitor, Object data) Accept a visitor.
IEnv	verifyTypes(IEnv env) Verify types within this statement; don't call this directly, use EvalMethods.verifyTypes(IStatementNode, IEnv).

Methods inherited from class edu.mit.ai.psg.jeva.JevaNode

checkInsertionPoint, find2ndTokenBeforeEndBody, findChildIndex, findPrecedingToken, findTokenBeforeChild, findTokenBeforeChild, findTokenBeforeEnd, getBeginToken, getEndToken, insertChildTokens, insertNewChildAfter, insertNewChildAt, insertNewChildBefore, jnGetChild, jnGetParent, notVerified, print, print, printSpecialTokens, printToken, printToString, printToString, removeChild, removeChildTokens, replaceChild, replaceChild, setBeginToken, setEndToken, shouldNotHappen, shouldNotHappen, shouldNotHappen, updateEndTokens, updateEndTokensPriorChild, updateEndTokensPriorNode, updateEndTokensPriorNode

Methods inherited from class edu.mit.ai.psg.jeva.SimpleNode

dump, jjtAddChild, jjtClose, jjtGetChild, jjtGetNumChildren, jjtGetParent, jjtOpen, jjtSetParent, toString, toString

Methods inherited from class java.lang.Object

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

Method Detail

jjtAccept

public Object jjtAccept(IJevaVisitor visitor,
                        Object data)

Description copied from interface: IJevaNode

Accept a visitor. For visitor design pattern: jjtAccept must simply

  return visitor.visit(this, data);  

which dispatches on the type of this to appropriate method of visitor

Overrides:

jjtAccept in class JevaNode

getExpression

public IExpressionNode getExpression()

verifyTypes

public IEnv verifyTypes(IEnv env)
                 throws VerifyingException

Description copied from interface: IStatementNode

Verify types within this statement; don't call this directly, use EvalMethods.verifyTypes(IStatementNode, IEnv). Builds env without evaluating anything with side effects, for the purpose of verifying types of later statements. May be used by preprocessors which must find the type of an expression in order to assign it to a new variable.

Specified by:

verifyTypes in interface IStatementNode

Tags copied from interface: IStatementNode

Parameters:

env - environment of names bindings.

Returns:

env or possibly extended env

Throws:

VerifyingException - if statement is illegal

See Also:

EvalMethods.verifyTypes(IStatementNode, IEnv)

eval

public IEnv eval(IEnv env)
          throws ThrowException

Description copied from interface: IStatementNode

Evaluate this Statement; don't call this directly, use EvalMethods.eval(IStatementNode, IEnv) Every statement needs to implement an eval method.

Specified by:

eval in interface IStatementNode

Tags copied from interface: IStatementNode

Parameters:

env - environment of names bindings.

Returns:

env or possibly extended env

Throws:

AbruptCompletionException - if abruptly completed with return, throw, break, or continue.

See Also:

EvalMethods.eval(IStatementNode, IEnv)