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

com.google.gwt.dev.js.ast.JsVars
A JavaScript var statement.

   * <code>currentLivenessPredicate</code> but not by
   * <code>alreadyLoadedPredicate</code>.
   */
  private JsStatement removeSomeVars(JsVars stat, LivenessPredicate currentLivenessPredicate,
      LivenessPredicate alreadyLoadedPredicate) {
    JsVars newVars = new JsVars(stat.getSourceInfo());


    for (JsVar var : stat) {
      if (isLive(var, currentLivenessPredicate) && !isLive(var, alreadyLoadedPredicate)) {
        newVars.add(var);
      }
    }


    if (newVars.getNumVars() == stat.getNumVars()) {
      // no change
      return stat;
    }


    if (newVars.iterator().hasNext()) {
      /*
       * The new variables are non-empty; return them.
       */
      return newVars;
    } else {

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          x !=  program.getTypeJavaLangString()) {
        generateClassSetup(x, globalStmts);
      }


      // setup fields
      JsVars vars = new JsVars(x.getSourceInfo());
      for (int i = 0; i < jsFields.size(); ++i) {
        JsNode node = jsFields.get(i);
        if (node instanceof JsVar) {
          vars.add((JsVar) node);
        } else {
          assert (node instanceof JsStatement);
          JsStatement stmt = (JsStatement) node;
          globalStmts.add(stmt);
          typeForStatMap.put(stmt, x);
        }
      }


      if (!vars.isEmpty()) {
        globalStmts.add(vars);
      }


      if (typeOracle.isInstantiatedType(x) && !program.isJavaScriptObject(x) &&
        x !=  program.getTypeJavaLangString()) {

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        handleClinit(clinitFunc, null);
        globalStmts.add(clinitFunc.makeStmt());
      }


      // setup fields
      JsVars vars = new JsVars(x.getSourceInfo());
      for (int i = 0; i < jsFields.size(); ++i) {
        vars.add(jsFields.get(i));
      }
      if (!vars.isEmpty()) {
        globalStmts.add(vars);
      }
    }

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       * Note: it's fine to use the same JS ident to represent two different
       * Java locals of the same name since they could never conflict with each
       * other in Java. We use the alreadySeen set to make sure we don't declare
       * the same-named local var twice.
       */
      JsVars vars = new JsVars(x.getSourceInfo());
      Set<String> alreadySeen = Sets.newHashSet();
      for (int i = 0; i < locals.size(); ++i) {
        JsName name = names.get(x.getLocals().get(i));
        String ident = name.getIdent();
        if (!alreadySeen.contains(ident)
            // Catch block params don't need var declarations
            && !catchParamIdentifiers.contains(name)) {
          alreadySeen.add(ident);
          vars.add(new JsVar(x.getSourceInfo(), name));
        }
      }


      if (!vars.isEmpty()) {
        jsFunc.getBody().getStatements().add(0, vars);
      }


      push(jsFunc);
    }

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      List<JsStatement> globalStmts = jsProgram.getGlobalBlock().getStatements();


      // Add a few things onto the beginning.


      // Reserve the "_" identifier.
      JsVars vars = new JsVars(jsProgram.getSourceInfo());
      vars.add(new JsVar(jsProgram.getSourceInfo(), globalTemp));
      globalStmts.add(0, vars);


      // Long lits must go at the top, they can be constant field initializers.
      generateLongLiterals(vars);
      generateImmortalTypes(vars);


      // Class objects, but only if there are any.
      if (x.getDeclaredTypes().contains(x.getTypeClassLiteralHolder())) {
        // TODO: perhaps they could be constant field initializers also?
        vars = new JsVars(jsProgram.getSourceInfo());
        generateClassLiterals(vars);
        if (!vars.isEmpty()) {
          globalStmts.add(vars);
        }
      }


      // Generate entry methods. Needs to be after class literal insertion since class literal will

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      JsVar entryVar = new JsVar(sourceInfo, entryName);
      JsInvocation registerEntryCall = new JsInvocation(sourceInfo);
      JsFunction registerEntryFunction = indexedFunctions.get("Impl.registerEntry");
      registerEntryCall.setQualifier(registerEntryFunction.getName().makeRef(sourceInfo));
      entryVar.setInitExpr(registerEntryCall);
      JsVars entryVars = new JsVars(sourceInfo);
      entryVars.add(entryVar);
      globalStmts.add(entryVars);


      // Stub gwtOnLoad at top level so that HtmlUnit can find it.
      // var gwtOnLoad = typeof gwtOnLoad === 'undefined' ? null : gwtOnLoad;
      JsName gwtOnLoadName = topScope.declareName("gwtOnLoad");
      gwtOnLoadName.setObfuscatable(false);
      JsVar gwtOnLoadNameVar = new JsVar(sourceInfo, gwtOnLoadName);
      gwtOnLoadNameVar.setInitExpr(new JsConditional(sourceInfo, new JsBinaryOperation(sourceInfo,
          JsBinaryOperator.REF_EQ, new JsPrefixOperation(
              sourceInfo, JsUnaryOperator.TYPEOF, gwtOnLoadName.makeRef(sourceInfo)),
          new JsStringLiteral(sourceInfo, "undefined")), JsNullLiteral.INSTANCE,
          gwtOnLoadName.makeRef(sourceInfo)));
      JsVars gwtOnLoadNameVars = new JsVars(sourceInfo);
      gwtOnLoadNameVars.add(gwtOnLoadNameVar);
      globalStmts.add(gwtOnLoadNameVars);


      // Create gwtOnLoad in function scope so the previousGwtOnLoad reference is preserved.
      // (function() {
      JsFunction createGwtOnLoadFunction = new JsFunction(sourceInfo, topScope);
      JsBlock createGwtOnLoadBody = new JsBlock(sourceInfo);
      createGwtOnLoadFunction.setBody(createGwtOnLoadBody);


      // var previousGwtOnLoad = gwtOnLoad;
      JsName previousGwtOnLoadName =
          createGwtOnLoadFunction.getScope().declareName("previousGwtOnLoad");
      JsVar previousGwtOnLoadNameVar = new JsVar(sourceInfo, previousGwtOnLoadName);
      previousGwtOnLoadNameVar.setInitExpr(gwtOnLoadName.makeRef(sourceInfo));
      JsVars previousGwtOnLoadNameVars = new JsVars(sourceInfo);
      previousGwtOnLoadNameVars.add(previousGwtOnLoadNameVar);
      createGwtOnLoadBody.getStatements().add(previousGwtOnLoadNameVars);


      // gwtOnLoad = function(errFn, modName, modBase, softPermutationId) {
      JsFunction gwtOnLoad = new JsFunction(sourceInfo, createGwtOnLoadFunction.getScope());
      gwtOnLoad.setArtificiallyRescued(true);

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       * of this transformation has alternating var lists and assignment
       * statements. The currentVar variable holds the most recently inserted
       * statement, if that statement was a JsVars; otherwise it holds null.
       */


      JsVars currentVar = null;
      Iterator<JsVar> varsIterator = x.iterator();
      while (varsIterator.hasNext()) {
        JsVar var = varsIterator.next();
        if (namesToPredefine.contains(var.getName())) {
          // The var was predefined
          if (var.getInitExpr() != null) {
            // If it has an initializer, add an assignment statement
            JsBinaryOperation asg =
                new JsBinaryOperation(var.getSourceInfo(), JsBinaryOperator.ASG, makeRefViaJslink(
                    var.getName(), var.getSourceInfo()), var.getInitExpr());
            ctx.insertBefore(asg.makeStmt());
            currentVar = null;
          }
        } else {
          // The var was not predefined; add it to a var list
          if (currentVar == null) {
            currentVar = new JsVars(x.getSourceInfo());
            ctx.insertBefore(currentVar);
          }
          currentVar.add(var);
        }
      }


      ctx.removeMe();
    }

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   * references.
   */
  private void defineJsLink() {
    SourceInfo info = jsProgram.createSourceInfoSynthetic(HandleCrossFragmentReferences.class);
    jslink = jsProgram.getScope().declareName("jslink");
    JsVars vars = new JsVars(info);
    JsVar var = new JsVar(info, jslink);
    var.setInitExpr(new JsObjectLiteral(info));
    vars.add(var);
    jsProgram.getFragmentBlock(0).getStatements().add(0, vars);
  }

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      if (typeOracle.isInstantiatedType(x)) {
        generateClassSetup(x, globalStmts);
      }


      // setup fields
      JsVars vars = new JsVars();
      for (int i = 0; i < jsFields.size(); ++i) {
        JsNode node = (JsNode) jsFields.get(i);
        if (node instanceof JsVar) {
          vars.add((JsVar) node);
        } else {
          assert (node instanceof JsStatement);
          JsStatement stmt = (JsStatement) jsFields.get(i);
          globalStmts.add(stmt);
        }
      }
      if (!vars.isEmpty()) {
        globalStmts.add(vars);
      }
    }

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        handleClinit(clinitFunc);
        globalStmts.add(clinitFunc.makeStmt());
      }


      // setup fields
      JsVars vars = new JsVars();
      for (int i = 0; i < jsFields.size(); ++i) {
        JsNode node = (JsNode) jsFields.get(i);
        assert (node instanceof JsVar);
        vars.add((JsVar) node);
      }
      if (!vars.isEmpty()) {
        globalStmts.add(vars);
      }
    }

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