Java FunctionNode.setEncodedSourceBounds方法代码示例

import org.mozilla.javascript.ast.FunctionNode; //导入方法依赖的package包/类
private Node transformFunction(FunctionNode fn) {
    int functionType = fn.getFunctionType();
    int start = decompiler.markFunctionStart(functionType);
    Node mexpr = decompileFunctionHeader(fn);
    int index = currentScriptOrFn.addFunction(fn);

    PerFunctionVariables savedVars = new PerFunctionVariables(fn);
    try {
        // If we start needing to record much more codegen metadata during
        // function parsing, we should lump it all into a helper class.
        Node destructuring = (Node)fn.getProp(Node.DESTRUCTURING_PARAMS);
        fn.removeProp(Node.DESTRUCTURING_PARAMS);

        int lineno = fn.getBody().getLineno();
        ++nestingOfFunction;  // only for body, not params
        Node body = transform(fn.getBody());

        if (!fn.isExpressionClosure()) {
            decompiler.addToken(Token.RC);
        }
        fn.setEncodedSourceBounds(start, decompiler.markFunctionEnd(start));

        if (functionType != FunctionNode.FUNCTION_EXPRESSION && !fn.isExpressionClosure()) {
            // Add EOL only if function is not part of expression
            // since it gets SEMI + EOL from Statement in that case
            decompiler.addToken(Token.EOL);
        }

        if (destructuring != null) {
            body.addChildToFront(new Node(Token.EXPR_VOID,
                                          destructuring, lineno));
        }

        int syntheticType = fn.getFunctionType();
        Node pn = initFunction(fn, index, body, syntheticType);
        if (mexpr != null) {
            pn = createAssignment(Token.ASSIGN, mexpr, pn);
            if (syntheticType != FunctionNode.FUNCTION_EXPRESSION) {
                pn = createExprStatementNoReturn(pn, fn.getLineno());
            }
        }
        return pn;

    } finally {
        --nestingOfFunction;
        savedVars.restore();
    }
}
 

import org.mozilla.javascript.ast.FunctionNode; //导入方法依赖的package包/类
private Node transformGenExpr(GeneratorExpression node) {
    Node pn;
    
    FunctionNode fn = new FunctionNode();
    fn.setSourceName(currentScriptOrFn.getNextTempName());
    fn.setIsGenerator();
    fn.setFunctionType(FunctionNode.FUNCTION_EXPRESSION);
    fn.setRequiresActivation();
  
    int functionType = fn.getFunctionType();
    int start = decompiler.markFunctionStart(functionType);
    Node mexpr = decompileFunctionHeader(fn);
    int index = currentScriptOrFn.addFunction(fn);

    PerFunctionVariables savedVars = new PerFunctionVariables(fn);
    try {
        // If we start needing to record much more codegen metadata during
        // function parsing, we should lump it all into a helper class.
        Node destructuring = (Node)fn.getProp(Node.DESTRUCTURING_PARAMS);
        fn.removeProp(Node.DESTRUCTURING_PARAMS);

        int lineno = node.lineno;
        ++nestingOfFunction;  // only for body, not params
        Node body = genExprTransformHelper(node);

        if (!fn.isExpressionClosure()) {
            decompiler.addToken(Token.RC);
        }
        fn.setEncodedSourceBounds(start, decompiler.markFunctionEnd(start));

        if (functionType != FunctionNode.FUNCTION_EXPRESSION && !fn.isExpressionClosure()) {
            // Add EOL only if function is not part of expression
            // since it gets SEMI + EOL from Statement in that case
            decompiler.addToken(Token.EOL);
        }

        if (destructuring != null) {
            body.addChildToFront(new Node(Token.EXPR_VOID,
                                          destructuring, lineno));
        }

        int syntheticType = fn.getFunctionType();
        pn = initFunction(fn, index, body, syntheticType);
        if (mexpr != null) {
            pn = createAssignment(Token.ASSIGN, mexpr, pn);
            if (syntheticType != FunctionNode.FUNCTION_EXPRESSION) {
                pn = createExprStatementNoReturn(pn, fn.getLineno());
            }
        }
    } finally {
        --nestingOfFunction;
        savedVars.restore();
    }
   
    Node call = createCallOrNew(Token.CALL, pn);
    call.setLineno(node.getLineno());
    decompiler.addToken(Token.LP);
    decompiler.addToken(Token.RP);
    return call;
}
 

import org.mozilla.javascript.ast.FunctionNode; //导入方法依赖的package包/类
private AstNode arrowFunction(AstNode params) throws IOException {
    int baseLineno = ts.lineno;  // line number where source starts
    int functionSourceStart = params != null ? params.getPosition() : -1;  // start of "function" kwd

    FunctionNode fnNode = new FunctionNode(functionSourceStart);
    fnNode.setFunctionType(FunctionNode.ARROW_FUNCTION);
    fnNode.setJsDocNode(getAndResetJsDoc());

    // Would prefer not to call createDestructuringAssignment until codegen,
    // but the symbol definitions have to happen now, before body is parsed.
    Map<String, Node> destructuring = new HashMap<String, Node>();
    Set<String> paramNames = new HashSet<String>();

    PerFunctionVariables savedVars = new PerFunctionVariables(fnNode);
    try {
        if (params instanceof ParenthesizedExpression) {
            fnNode.setParens(0, params.getLength());
            AstNode p = ((ParenthesizedExpression)params).getExpression();
            if (!(p instanceof EmptyExpression)) {
                arrowFunctionParams(fnNode, p, destructuring, paramNames);
            }
        } else {
            arrowFunctionParams(fnNode, params, destructuring, paramNames);
        }

        if (!destructuring.isEmpty()) {
            Node destructuringNode = new Node(Token.COMMA);
            // Add assignment helper for each destructuring parameter
            for (Map.Entry<String, Node> param: destructuring.entrySet()) {
                Node assign = createDestructuringAssignment(Token.VAR,
                                                            param.getValue(), createName(param.getKey()));
                destructuringNode.addChildToBack(assign);

            }
            fnNode.putProp(Node.DESTRUCTURING_PARAMS, destructuringNode);
        }
            
        fnNode.setBody(parseFunctionBody(FunctionNode.ARROW_FUNCTION, fnNode));
        fnNode.setEncodedSourceBounds(functionSourceStart, ts.tokenEnd);
        fnNode.setLength(ts.tokenEnd - functionSourceStart);
    } finally {
        savedVars.restore();
    }

    if (fnNode.isGenerator()) {
        reportError("msg.arrowfunction.generator");
        return makeErrorNode();
    }

    fnNode.setSourceName(sourceURI);
    fnNode.setBaseLineno(baseLineno);
    fnNode.setEndLineno(ts.lineno);

    return fnNode;
}