edu.mit.ai.psg.jeva
Interface IStatementNode

All Known Subinterfaces:

IDeclarationNode

All Known Implementing Classes:

JNSBlock, JNSBreakStatement, JNSContinueStatement, JNSDoStatement, JNSEmptyStatement, JNSExplicitConstructorInvocation, JNSExpressionStatement, JNSExpressionStatementList, JNSForStatement, JNSIfStatement, JNSLocalVariableDeclaration, JNSReturnStatement, JNSSwitchStatement, JNSSynchronizedStatement, JNSThrowStatement, JNSTryStatement, JNSWhileStatement, JNSLabeledStatement

public abstract interface IStatementNode

extends IJevaNode

Interface to parse nodes for Java statements.

Author:

CarlManning, caroma@ai.mit.edu
Copyright (c) 1997, 1998, 1999 Massachusetts Institute of Technology

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.
IEnv	verifyTypes(IEnv env) Verify types within this statement; don't call this directly, use EvalMethods.verifyTypes(IStatementNode, IEnv).

Methods inherited from interface edu.mit.ai.psg.jeva.IJevaNode

getBeginToken, getEndToken, insertNewChildAfter, insertNewChildAt, insertNewChildBefore, jjtAccept, jnGetChild, jnGetParent, print, print, printToString, printToString, removeChild, replaceChild, replaceChild, setBeginToken, setEndToken

Methods inherited from interface edu.mit.ai.psg.jeva.Node

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

Method Detail

verifyTypes

public IEnv verifyTypes(IEnv env)
                 throws VerifyingException

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.

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 AbruptCompletionException

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

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)