Examples of com.google.gwt.dev.js.ast.JsBinaryOperation

com.google.gwt.dev.js.ast.JsBinaryOperation
Represents a JavaScript binary operation.

       * that we encounter. If we do this correctly,it will help to cut down on
       * the number of unnecessary parens in the emitted JS.
       */
      // (X) O (c O d) ==> ((X) O c) O d
      {
        JsBinaryOperation rightOp = null;
        if (arg2 instanceof JsBinaryOperation) {
          rightOp = (JsBinaryOperation) arg2;
        }
        if (rightOp != null && !rightOp.getOperator().isAssignment()
            && op == rightOp.getOperator()) {


          if (op == JsBinaryOperator.ADD) {
            /*
             * JS type coercion is a problem if we don't know for certain that
             * the right-hand expression will definitely be evaluated in a
             * string context.
             */
            boolean mustBeString = additionCoercesToString(rightOp.getArg1())
                || (additionCoercesToString(arg1) && additionCoercesToString(rightOp.getArg2()));
            if (!mustBeString) {
              return toReturn;
            }
          }


          // (X) O c --> Try to reduce this
          JsExpression newLeft = new JsBinaryOperation(x.getSourceInfo(), op,
              arg1, rightOp.getArg1());


          // Reset local vars with new state
          op = rightOp.getOperator();
          arg1 = accept(newLeft);
          arg2 = rightOp.getArg2();
          x = new JsBinaryOperation(x.getSourceInfo(), op, arg1, arg2);


          ctx.replaceMe(x);
          toReturn = didChange = true;
        }
      }


      /*
       * Now that we know that our AST is as left-normal as we can make it
       * (because this method is called from endVisit), we now try to simplify
       * the left-right node and the right node.
       */
      // (a O b) O c ==> a O s
      {
        JsBinaryOperation leftOp = null;
        JsExpression leftLeft = null;
        JsExpression leftRight = null;


        if (arg1 instanceof JsBinaryOperation) {
          leftOp = (JsBinaryOperation) arg1;
          if (op.getPrecedence() == leftOp.getOperator().getPrecedence()) {
            leftLeft = leftOp.getArg1();
            leftRight = leftOp.getArg2();
          }
        }


        if (leftRight != null) {
          if (op == JsBinaryOperator.ADD) {
            // Behavior as described above
            boolean mustBeString = additionCoercesToString(leftRight)
                || (additionCoercesToString(leftLeft) && additionCoercesToString(arg2));
            if (!mustBeString) {
              return toReturn;
            }
          }


          // (b O c)
          JsBinaryOperation middle = new JsBinaryOperation(x.getSourceInfo(),
              op, leftRight, arg2);
          StaticEvalVisitor v = new StaticEvalVisitor();
          JsExpression maybeSimplified = v.accept(middle);


          if (v.didChange()) {

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      stack.push(toReturn);
    }


    @Override
    public void endVisit(JsBinaryOperation x, JsContext<JsExpression> ctx) {
      JsBinaryOperation toReturn = new JsBinaryOperation(x.getSourceInfo(),
          x.getOperator());
      toReturn.setArg2(stack.pop());
      toReturn.setArg1(stack.pop());
      stack.push(toReturn);
    }

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    Node from2 = from1.getNext();


    JsExpression to1 = mapExpression(from1);
    JsExpression to2 = mapExpression(from2);


    return new JsBinaryOperation(makeSourceInfo(node), op, to1, to2);
  }

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    // Map the RHS.
    //
    Node fromRhs = setElemNode.getFirstChild().getNext().getNext();
    JsExpression toRhs = mapExpression(fromRhs);


    return new JsBinaryOperation(makeSourceInfo(setElemNode),
        JsBinaryOperator.ASG, lhs, toRhs);
  }

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    // Map the RHS.
    //
    Node fromRhs = getPropNode.getFirstChild().getNext().getNext();
    JsExpression toRhs = mapExpression(fromRhs);


    return new JsBinaryOperation(makeSourceInfo(getPropNode),
        JsBinaryOperator.ASG, lhs, toRhs);
  }

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      if (!(expr instanceof JsBinaryOperation)) {
        return;
      }


      JsBinaryOperation op = (JsBinaryOperation) expr;
      if (!(op.getArg2() instanceof JsInvocation)) {
        return;
      }


      JsInvocation i = (JsInvocation) op.getArg2();
      JsExpression q = i.getQualifier();
      if (!(q instanceof JsNameRef)) {
        return;
      }


      JsName name = ((JsNameRef) q).getName();
      if (name == null) {
        return;
      }


      // caughtFunction is the JsFunction translated from Exceptions.caught
      if (name.getStaticRef() != caughtFunction) {
        return;
      }


      // $stackDepth = stackIndex
      SourceInfo info = x.getSourceInfo().makeChild(JsStackEmulator.class,
          "Resetting stack depth");
      JsBinaryOperation reset = new JsBinaryOperation(info,
          JsBinaryOperator.ASG, stackDepth.makeRef(info),
          eeVisitor.stackIndexRef(info));


      ctx.insertAfter(reset.makeStmt());
    }

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    @Override
    public void endVisit(JsReturn x, JsContext<JsStatement> ctx) {
      if (outerFinallyBlock != null) {
        // There is a finally block, so we need to set the early-exit flag
        JsBinaryOperation asg = new JsBinaryOperation(x.getSourceInfo(),
            JsBinaryOperator.ASG, earlyExitRef(outerFinallyBlock),
            program.getBooleanLiteral(true));
        if (x.getExpr() == null) {
          if (ctx.canInsert()) {
            // exitingEarly = true; return;
            ctx.insertBefore(asg.makeStmt());
          } else {
            // {exitingEarly = true; return;}
            JsBlock block = new JsBlock(x.getSourceInfo());
            block.getStatements().add(asg.makeStmt());
            block.getStatements().add(x);
            ctx.replaceMe(block);
          }
        } else {
          // return (exitingEarly = true, expr);
          JsBinaryOperation op = new JsBinaryOperation(x.getSourceInfo(),
              JsBinaryOperator.COMMA, asg, x.getExpr());
          x.setExpr(op);
        }
      } else {
        if (x.getExpr() != null && x.getExpr().hasSideEffects()) {
          // temp = expr; pop(); return temp;
          SourceInfo info = x.getSourceInfo().makeChild(JsStackEmulator.class,
              "Flow break with side-effect");
          JsBinaryOperation asg = new JsBinaryOperation(info,
              JsBinaryOperator.ASG, returnTempRef(info), x.getExpr());
          x.setExpr(returnTempRef(info));
          pop(x, asg, ctx);
        } else {
          // Otherwise, pop the stack frame

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          "Stack exit");
      JsExpression op = pop(info);


      if (checkEarlyExit) {
        // earlyExit && pop()
        op = new JsBinaryOperation(info, JsBinaryOperator.AND, earlyExitRef(x),
            op);
      }


      x.getStatements().add(op.makeStmt());
    }

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      JsInvocation caughtCall = new JsInvocation(info);
      caughtCall.setQualifier(caughtFunction.getName().makeRef(info));
      caughtCall.getArguments().add(paramName.makeRef(info));


      // e = caught(e)
      JsBinaryOperation asg = new JsBinaryOperation(info, JsBinaryOperator.ASG,
          paramName.makeRef(info), caughtCall);


      // throw e
      JsThrow throwStatement = new JsThrow(info, paramName.makeRef(info));


      JsBlock body = new JsBlock(info);
      body.getStatements().add(asg.makeStmt());
      body.getStatements().add(throwStatement);
      c.setBody(body);
      return c;
    }

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    /**
     * Decrement the $stackDepth variable.
     */
    private JsExpression pop(SourceInfo info) {
      JsBinaryOperation sub = new JsBinaryOperation(info, JsBinaryOperator.SUB,
          stackIndexRef(info), program.getNumberLiteral(1));
      JsBinaryOperation op = new JsBinaryOperation(info, JsBinaryOperator.ASG,
          stackDepth.makeRef(info), sub);
      return op;
    }

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