Examples of com.google.gwt.dev.jjs.ast.JBooleanLiteral

com.google.gwt.dev.jjs.ast.JBooleanLiteral
Java boolean literal expression.

     * Convert do { } while (false); into a block.
     */
    public void endVisit(JDoStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace do with do's body
        if (!booleanLiteral.getValue()) {
          // Unless it contains break/continue statements
          FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
          visitor.accept(x.getBody());
          if (!visitor.hasBreakContinueStatements()) {
            ctx.replaceMe(x.getBody());

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     * Prune for (X; false; Y) statements, but make sure X is run.
     */
    public void endVisit(JForStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace the for statement with its initializers
        if (!booleanLiteral.getValue()) {
          JBlock block = new JBlock(program, x.getSourceInfo());
          block.statements.addAll(x.getInitializers());
          ctx.replaceMe(block);
        }
      }

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    public void endVisit(JIfStatement x, Context ctx) {
      JExpression expr = x.getIfExpr();
      JStatement thenStmt = x.getThenStmt();
      JStatement elseStmt = x.getElseStmt();
      if (expr instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expr;
        boolean boolVal = booleanLiteral.getValue();
        if (boolVal && !isEmpty(thenStmt)) {
          // If true, replace myself with then statement
          ctx.replaceMe(thenStmt);
        } else if (!boolVal && !isEmpty(elseStmt)) {
          // If false, replace myself with else statement

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    public void endVisit(JPrefixOperation x, Context ctx) {
      if (x.getOp() == JUnaryOperator.NOT) {
        JExpression arg = x.getArg();
        if (arg instanceof JBooleanLiteral) {
          // e.g. !true -> false; !false -> true
          JBooleanLiteral booleanLiteral = (JBooleanLiteral) arg;
          ctx.replaceMe(program.getLiteralBoolean(!booleanLiteral.getValue()));
        } else if (arg instanceof JBinaryOperation) {
          // try to invert the binary operator
          JBinaryOperation argOp = (JBinaryOperation) arg;
          JBinaryOperator op = argOp.getOp();
          JBinaryOperator newOp = null;

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     * Prune while (false) statements.
     */
    public void endVisit(JWhileStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, prune the while statement
        if (!booleanLiteral.getValue()) {
          removeMe(x, ctx);
        }
      }
    }

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     */
    @Override
    public void endVisit(JDoStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace do with do's body
        if (!booleanLiteral.getValue()) {
          // Unless it contains break/continue statements
          FindBreakContinueStatementsVisitor visitor = new FindBreakContinueStatementsVisitor();
          visitor.accept(x.getBody());
          if (!visitor.hasBreakContinueStatements()) {
            ctx.replaceMe(x.getBody());

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     */
    @Override
    public void endVisit(JForStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, replace the for statement with its initializers
        if (!booleanLiteral.getValue()) {
          JBlock block = new JBlock(x.getSourceInfo());
          block.addStmts(x.getInitializers());
          ctx.replaceMe(block);
        }
      }

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     */
    @Override
    public void endVisit(JWhileStatement x, Context ctx) {
      JExpression expression = x.getTestExpr();
      if (expression instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) expression;


        // If false, prune the while statement
        if (!booleanLiteral.getValue()) {
          removeMe(x, ctx);
        }
      }
    }

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            return true;
          }
          return false;


        case NOT: {
          JBooleanLiteral booleanLit = (JBooleanLiteral) exp;
          ctx.replaceMe(program.getLiteralBoolean(!booleanLit.getValue()));
          return true;
        }


        default:
          return false;

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     * if (isWhatever() && false) -> if (false), unless side effects
     * </pre>
     */
    private void shortCircuitAnd(JExpression lhs, JExpression rhs, Context ctx) {
      if (lhs instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) lhs;
        if (booleanLiteral.getValue()) {
          ctx.replaceMe(rhs);
        } else {
          ctx.replaceMe(lhs);
        }


      } else if (rhs instanceof JBooleanLiteral) {
        JBooleanLiteral booleanLiteral = (JBooleanLiteral) rhs;
        if (booleanLiteral.getValue()) {
          ctx.replaceMe(lhs);
        } else if (!lhs.hasSideEffects()) {
          ctx.replaceMe(rhs);
        }
      }

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