Java 类org.mozilla.javascript.ast.WhileLoop 实例源码

private Node transformWhileLoop(WhileLoop loop) {
    decompiler.addToken(Token.WHILE);
    loop.setType(Token.LOOP);
    pushScope(loop);
    try {
        decompiler.addToken(Token.LP);
        Node cond = transform(loop.getCondition());
        decompiler.addToken(Token.RP);
        decompiler.addEOL(Token.LC);
        Node body = transform(loop.getBody());
        decompiler.addEOL(Token.RC);
        return createLoop(loop, LOOP_WHILE, body, cond, null, null);
    } finally {
        popScope();
    }
}

private WhileLoop whileLoop()
    throws IOException
{
    if (currentToken != Token.WHILE) codeBug();
    consumeToken();
    int pos = ts.tokenBeg;
    WhileLoop pn = new WhileLoop(pos);
    pn.setLineno(ts.lineno);
    enterLoop(pn);
    try {
        ConditionData data = condition();
        pn.setCondition(data.condition);
        pn.setParens(data.lp - pos, data.rp - pos);
        AstNode body = statement();
        pn.setLength(getNodeEnd(body) - pos);
        pn.setBody(body);
    } finally {
        exitLoop();
    }
    return pn;
}

private Node transformWhileLoop(WhileLoop loop) {
    decompiler.addToken(Token.WHILE);
    loop.setType(Token.LOOP);
    pushScope(loop);
    try {
        decompiler.addToken(Token.LP);
        Node cond = transform(loop.getCondition());
        decompiler.addToken(Token.RP);
        decompiler.addEOL(Token.LC);
        Node body = transform(loop.getBody());
        decompiler.addEOL(Token.RC);
        return createLoop(loop, LOOP_WHILE, body, cond, null, null);
    } finally {
        popScope();
    }
}

private WhileLoop whileLoop()
    throws IOException
{
    if (currentToken != Token.WHILE) codeBug();
    consumeToken();
    int pos = ts.tokenBeg;
    WhileLoop pn = new WhileLoop(pos);
    pn.setLineno(ts.lineno);
    enterLoop(pn);
    try {
        ConditionData data = condition();
        pn.setCondition(data.condition);
        pn.setParens(data.lp - pos, data.rp - pos);
        AstNode body = statement();
        pn.setLength(getNodeEnd(body) - pos);
        pn.setBody(body);
    } finally {
        exitLoop();
    }
    return pn;
}

/**
 * Extract while loop from node and add new code block
 */
private void processWhileNode(Node child, CodeBlock block,
        Set<Completion> set, String entered, int offset) {
    WhileLoop loop = (WhileLoop) child;
    if (canProcessNode(loop)) {
        offset = loop.getAbsolutePosition() + loop.getLength();
        addCodeBlock(loop.getBody(), set, entered, block, offset);
    }
}

/**
 * This method generates constraints for all relevant AstNodes. It delegates its work to various
 * processXXX() methods that handle AstNodes of type XXX.
 */
@Override
public boolean visit(AstNode node) {
    if (node instanceof VariableInitializer){
        processVariableInitializer(node);
    } else if (node instanceof ReturnStatement){
        processReturnStatement((ReturnStatement)node);
    } else if (node instanceof ExpressionStatement){
        processExpressionStatement((ExpressionStatement)node);
    } else if (node instanceof ForLoop){
        processForLoop((ForLoop)node);
    } else if (node instanceof ForInLoop){
        processForInLoop((ForInLoop)node);
    }else if (node instanceof WhileLoop){
        processWhileLoop((WhileLoop)node);
    } else if (node instanceof DoLoop){
        processDoLoop((DoLoop)node);
    } else if (node instanceof NewExpression){
        processNewExpression((NewExpression)node);
    } else if (node instanceof FunctionCall){
        processFunctionCall((FunctionCall)node);
    } else if (node instanceof ElementGet){
        processElementGet((ElementGet)node);
    } else if (node instanceof FunctionNode){
        processFunctionNode((FunctionNode)node);
    } else if (node instanceof IfStatement){
        processIfStatement((IfStatement)node);
    } else if (node instanceof KeywordLiteral){
        processKeywordLiteral((KeywordLiteral)node);
    } else if (node instanceof SwitchStatement){
        processSwitchStatement((SwitchStatement)node);
    } else if (node instanceof SwitchCase){
        processSwitchCase((SwitchCase)node);
    } else if ((node instanceof AstRoot) || //AstRoot: no constraints need to be generated
        (node instanceof BreakStatement) || //BreakStatement: no constraints need to be generated
        (node instanceof VariableDeclaration) || //VariableDeclaration: we generate constraints for its constituent VariableInitializer nodes
        (node instanceof Name) || //Name: generate constraints for complex expressions that refer to names
        (node instanceof NumberLiteral) || //NumberLiteral: generate constraints for complex expressions that refer to names
        (node instanceof StringLiteral) || //StringLiteral: generate constraints for complex expressions that refer to names
        (node instanceof Assignment) || // Assignment is a special case of InfixExpression
        (node instanceof ArrayLiteral) ||
        (node instanceof UnaryExpression) ||
        (node instanceof InfixExpression) ||
        (node instanceof ConditionalExpression) ||
        (node instanceof ParenthesizedExpression) ||
        (node instanceof EmptyExpression) ||
        (node instanceof ObjectLiteral) ||
        (node instanceof EmptyStatement) ||
        (node instanceof ContinueStatement) ||
        (node instanceof Scope) ||
        (node instanceof Block)){ // // occurs in programs with for loops -- nothing to be done here?
        /* nothing */
    } else {
        error("unsupported node " + node.toSource().trim() + " of type: " + node.getClass().getName(), node);
    }
    return true;
}

/**
 * generate constraints for a while-statement
 */
private void processWhileLoop(WhileLoop w) {
    AstNode condition = w.getCondition();
    processExpression(condition);
}

private void print(WhileLoop node) throws IOException {
    writer.append("while").ws().append('(');
    print(node.getCondition());
    writer.append(')').ws();
    print(node.getBody());
}