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

com.google.gwt.dev.js.ast.JsStatement
Abstract base class for JavaScript statement objects.

    //
    JsExpression toTestExpr = mapExpression(fromTestExpr);


    // Map the body block.
    //
    JsStatement toBody = mapStatement(fromBody);


    popSourceInfo();


    // Create and attach the "while" or "do" statement we're mapping to.
    //

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      }
      toForIn.setObjExpr(mapExpression(fromObjExpr));


      // The body stmt.
      //
      JsStatement bodyStmt = mapStatement(fromBody);
      if (bodyStmt != null) {
        toForIn.setBody(bodyStmt);
      } else {
        toForIn.setBody(program.getEmptyStmt());
      }


      return toForIn;
    } else {
      // Regular ol' for loop.
      //
      JsFor toFor = new JsFor(makeSourceInfo(forNode));


      // The first item is either an expression or a JsVars.
      // Javac 1.6.0_01 doesn't like the cast below if this is parameterized
      @SuppressWarnings("unchecked")
      JsNode initThingy = map(fromInit);
      if (initThingy != null) {
        if (initThingy instanceof JsVars) {
          toFor.setInitVars((JsVars) initThingy);
        } else {
          assert (initThingy instanceof JsExpression);
          toFor.setInitExpr((JsExpression) initThingy);
        }
      }
      toFor.setCondition(mapOptionalExpression(fromTest));
      toFor.setIncrExpr(mapOptionalExpression(fromIncr));


      JsStatement bodyStmt = mapStatement(fromBody);
      if (bodyStmt != null) {
        toFor.setBody(bodyStmt);
      } else {
        toFor.setBody(program.getEmptyStmt());
      }

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  private void mapStatements(List<JsStatement> stmts, Node nodeStmts)
      throws JsParserException {
    Node curr = nodeStmts.getFirstChild();
    while (curr != null) {
      JsStatement stmt = mapStatement(curr);
      if (stmt != null) {
        stmts.add(stmt);
      } else {
        // When mapStatement() returns null, we just ignore it.
        //

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        ListIterator<JsStatement> i = statements.listIterator();
        List<JsStatement> statementsInNewBlock = null;


        // This loop represents a single fold over the list of statements
        while (statements.size() > MAX_BLOCK_SIZE && i.hasNext()) {
          JsStatement current = i.next();


          if (statementsInNewBlock == null) {
            // Replace the current statement with a new block
            JsBlock newBlock = new JsBlock(sourceInfo);
            statementsInNewBlock = newBlock.getStatements();

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  public boolean visit(JsBlock x, JsContext<JsStatement> ctx) {
    if (x == scopeStack.peek()) {
      ListIterator<JsStatement> itr = x.getStatements().listIterator();
      itrStack.push(itr);
      while (itr.hasNext()) {
        JsStatement stmt = itr.next();
        JsFunction func = JsStaticEval.isFunctionDecl(stmt);
        // Already at the top level.
        if (func != null) {
          dontMove.add(func);
        }

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       * Remove any dead statements after an abrupt change in code flow and
       * promote safe statements within nested blocks to this block.
       */
      List<JsStatement> stmts = x.getStatements();
      for (int i = 0; i < stmts.size(); i++) {
        JsStatement stmt = stmts.get(i);


        if (stmt instanceof JsBlock) {
          // Promote a sub-block's children to the current block.
          JsBlock block = (JsBlock) stmt;
          stmts.remove(i);
          stmts.addAll(i, block.getStatements());
          i--;
          didChange = true;
          continue;
        }


        if (stmt.unconditionalControlBreak()) {
          // Abrupt change in flow, chop the remaining items from this block
          for (int j = i + 1; j < stmts.size();) {
            JsStatement toRemove = stmts.get(j);
            JsStatement toReplace = ensureDeclarations(toRemove);
            if (toReplace == null) {
              stmts.remove(j);
              didChange = true;
            } else if (toReplace == toRemove) {
              ++j;

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          }
          if (x.getInitVars() != null) {
            block.getStatements().add(x.getInitVars());
          }
          block.getStatements().add(expr.makeStmt());
          JsStatement decls = ensureDeclarations(x.getBody());
          if (decls != null) {
            block.getStatements().add(decls);
          }
          ctx.replaceMe(accept(block));
        }

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        if (tryStaticEvalIf(x, (CanBooleanEval) condExpr, ctx)) {
          return;
        }
      }


      JsStatement thenStmt = x.getThenStmt();
      JsStatement elseStmt = x.getElseStmt();
      boolean thenIsEmpty = isEmpty(thenStmt);
      boolean elseIsEmpty = isEmpty(elseStmt);
      JsExpression thenExpr = extractExpression(thenStmt);
      JsExpression elseExpr = extractExpression(elseStmt);

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        // 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) {
            block.getStatements().add(decls);
          }
          ctx.replaceMe(accept(block));
        }

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      }
    }


    private boolean tryStaticEvalIf(JsIf x, CanBooleanEval cond,
        JsContext<JsStatement> ctx) {
      JsStatement thenStmt = x.getThenStmt();
      JsStatement elseStmt = x.getElseStmt();
      if (cond.isBooleanTrue()) {
        JsBlock block = new JsBlock(makeSourceInfo(x,
            "Simplified always-true condition"));
        block.getStatements().add(x.getIfExpr().makeStmt());
        if (thenStmt != null) {
          block.getStatements().add(thenStmt);
        }
        JsStatement decls = ensureDeclarations(elseStmt);
        if (decls != null) {
          block.getStatements().add(decls);
        }
        ctx.replaceMe(accept(block));
        return true;
      } else if (cond.isBooleanFalse()) {
        JsBlock block = new JsBlock(makeSourceInfo(x,
            "Simplified always-false condition"));
        block.getStatements().add(x.getIfExpr().makeStmt());
        if (elseStmt != null) {
          block.getStatements().add(elseStmt);
        }
        JsStatement decls = ensureDeclarations(thenStmt);
        if (decls != null) {
          block.getStatements().add(decls);
        }
        ctx.replaceMe(accept(block));
        return true;

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