Examples of CanBooleanEval

com.google.gwt.dev.js.ast.CanBooleanEval
An interface that describes the boolean evaluation of an expression.

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

   */
  protected static JsExpression shortCircuitAnd(JsBinaryOperation expr) {
    JsExpression arg1 = expr.getArg1();
    JsExpression arg2 = expr.getArg2();
    if (arg1 instanceof CanBooleanEval) {
      CanBooleanEval eval1 = (CanBooleanEval) arg1;
      if (eval1.isBooleanTrue() && !arg1.hasSideEffects()) {
        return arg2;
      } else if (eval1.isBooleanFalse()) {
        return arg1;
      }
    }
    return expr;
  }

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

   */
  protected static JsExpression shortCircuitOr(JsBinaryOperation expr) {
    JsExpression arg1 = expr.getArg1();
    JsExpression arg2 = expr.getArg2();
    if (arg1 instanceof CanBooleanEval) {
      CanBooleanEval eval1 = (CanBooleanEval) arg1;
      if (eval1.isBooleanTrue()) {
        return arg1;
      } else if (eval1.isBooleanFalse() && !arg1.hasSideEffects()) {
        return arg2;
      }
    }
    return expr;
  }

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


      JsExpression condExpr = x.getTestExpression();
      JsExpression thenExpr = x.getThenExpression();
      JsExpression elseExpr = x.getElseExpression();
      if (condExpr instanceof CanBooleanEval) {
        CanBooleanEval condEval = (CanBooleanEval) condExpr;
        if (condEval.isBooleanTrue()) {
          JsBinaryOperation binOp = new JsBinaryOperation(x.getSourceInfo(),
              JsBinaryOperator.AND, condExpr, thenExpr);
          ctx.replaceMe(accept(binOp));
        } else if (condEval.isBooleanFalse()) {
          // e.g. (false() ? then : else) -> false() || else
          JsBinaryOperation binOp = new JsBinaryOperation(x.getSourceInfo(),
              JsBinaryOperator.OR, condExpr, elseExpr);
          ctx.replaceMe(accept(binOp));
        }

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

    public void endVisit(JsDoWhile x, JsContext ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace do with do's body
        if (cond.isBooleanFalse()) {
          // Unless it contains break/continue statements
          FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
          visitor.accept(x.getBody());
          if (!visitor.hasBreakContinueStatements()) {
            JsBlock block = new JsBlock(x.getSourceInfo());

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

    public void endVisit(JsFor x, JsContext ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace with initializers and condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock(x.getSourceInfo());
          if (x.getInitExpr() != null) {
            block.getStatements().add(x.getInitExpr().makeStmt());
          }
          if (x.getInitVars() != null) {

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

    public void endVisit(JsWhile x, JsContext ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace with condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock(x.getSourceInfo());
          block.getStatements().add(expr.makeStmt());
          JsStatement decls = ensureDeclarations(x.getBody());
          if (decls != null) {
            block.getStatements().add(decls);

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


      JsExpression condExpr = x.getTestExpression();
      JsExpression thenExpr = x.getThenExpression();
      JsExpression elseExpr = x.getElseExpression();
      if (condExpr instanceof CanBooleanEval) {
        CanBooleanEval condEval = (CanBooleanEval) condExpr;
        if (condEval.isBooleanTrue()) {
          JsBinaryOperation binOp = new JsBinaryOperation(makeSourceInfo(x,
              "Simplified always-true condition"), JsBinaryOperator.AND,
              condExpr, thenExpr);
          ctx.replaceMe(accept(binOp));
        } else if (condEval.isBooleanFalse()) {
          // e.g. (false() ? then : else) -> false() || else
          JsBinaryOperation binOp = new JsBinaryOperation(makeSourceInfo(x,
              "Simplified always-false condition"), JsBinaryOperator.OR,
              condExpr, elseExpr);
          ctx.replaceMe(accept(binOp));

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

    public void endVisit(JsDoWhile x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace do with do's body
        if (cond.isBooleanFalse()) {
          // Unless it contains break/continue statements
          FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
          visitor.accept(x.getBody());
          if (!visitor.hasBreakContinueStatements()) {
            JsBlock block = new JsBlock(makeSourceInfo(x,

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

    public void endVisit(JsFor x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace with initializers and condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock(makeSourceInfo(x,
              "Simplified always-false condition"));
          if (x.getInitExpr() != null) {
            block.getStatements().add(x.getInitExpr().makeStmt());
          }

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

    public void endVisit(JsWhile x, JsContext<JsStatement> ctx) {
      evalBooleanContext.remove(x.getCondition());


      JsExpression expr = x.getCondition();
      if (expr instanceof CanBooleanEval) {
        CanBooleanEval cond = (CanBooleanEval) expr;


        // If false, replace with condition.
        if (cond.isBooleanFalse()) {
          JsBlock block = new JsBlock(makeSourceInfo(x,
              "Simplified always-false condition"));
          block.getStatements().add(expr.makeStmt());
          JsStatement decls = ensureDeclarations(x.getBody());
          if (decls != null) {

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