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

com.google.gwt.dev.js.ast.JsScope
A scope is a factory for creating and allocating {@link com.google.gwt.dev.js.ast.JsName}s. A JavaScript AST is built in terms of abstract name objects without worrying about obfuscation, keyword/identifier blacklisting, and so on.
Scopes are associated with {@link com.google.gwt.dev.js.ast.JsFunction}s, but the two are not equivalent. Functions have scopes, but a scope does not necessarily have an associated Function. Examples of this include the {@link com.google.gwt.dev.js.ast.JsRootScope} and synthetic scopes thatmight be created by a client.
Scopes can have parents to provide constraints when allocating actual identifiers for names. Specifically, names in child scopes are chosen such that they do not conflict with names in their parent scopes. The ultimate parent is usually the global scope (see {@link com.google.gwt.dev.js.ast.JsProgram#getGlobalScope()}), but parentless scopes are useful for managing names that are always accessed with a qualifier and could therefore never be confused with the global scope hierarchy.

         * the same function has been inlined in multiple places within the
         * function so we'll use a counter for disambiguation.
         */
        String ident;
        int count = 0;
        JsScope scope = functionStack.peek().getScope();
        do {
          ident = f.getName() + "_" + name.getIdent() + "_" + count++;
        } while (scope.findExistingName(ident) != null);


        JsName newName = scope.declareName(ident, name.getShortIdent());
        v.setReplacementName(name, newName);
        nameIterator.set(newName);
      }
      op = v.accept(op);

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         * the same function has been inlined in multiple places within the
         * function so we'll use a counter for disambiguation.
         */
        String ident;
        String base = invokedFunction.getName() + "_" + name.getIdent();
        JsScope scope = callerFunction.getScope();
        Multiset<String> startIdent = startIdentForScope.get(scope);
        if (startIdent == null) {
          startIdent = HashMultiset.create();
          startIdentForScope.put(scope, startIdent);
        }


        int suffix = startIdent.count(base);
        do {
          ident = base + "_" + suffix++;
        } while (scope.findExistingName(ident) != null);
        startIdent.setCount(base, suffix);


        JsName newName = scope.declareName(ident, name.getShortIdent());
        v.setReplacementName(name, newName);
        nameIterator.set(newName);
      }
      op = v.accept(op);

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      JsFunction context) {
    /*
     * If the caller contains no nested functions, none of its locals can
     * possibly be affected by side effects.
     */
    JsScope safeScope = null;
    if (context != null && !containsNestedFunctions(context)) {
      safeScope = context.getScope();
    }
    AffectedBySideEffectsVisitor v = new AffectedBySideEffectsVisitor(safeScope);
    v.acceptList(list);

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    }


    @Override
    public void endVisit(JLocal x, Context ctx) {
      // locals can conflict, that's okay just reuse the same variable
      JsScope scope = scopeStack.peek();
      JsName jsName = scope.declareName(x.getName());
      names.put(x, jsName);
    }

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    }


    @Override
    public boolean visit(JClassType x, Context ctx) {
      // have I already been visited as a super type?
      JsScope myScope = classScopes.get(x);
      if (myScope != null) {
        scopeStack.push(myScope);
        return false;
      }


      // My seed function name
      JsName jsName = topScope.declareName(getNameString(x), x.getShortName());
      names.put(x, jsName);
      recordSymbol(x, jsName);


      // My class scope
      if (x.getSuperClass() == null || x.getSuperClass().isJsPrototypeStub()) {
        myScope = objectScope;
      } else {
        JsScope parentScope = classScopes.get(x.getSuperClass());
        // Run my superclass first!
        if (parentScope == null) {
          accept(x.getSuperClass());
        }
        parentScope = classScopes.get(x.getSuperClass());

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    }


    private JsName createTmpLocal() {
      SourceInfo sourceInfo = currentMethod.getSourceInfo();
      JsFunction func = getJsFunctionFor(currentMethod);
      JsScope funcScope = func.getScope();
      JsName tmpName;
      String tmpIdent = LOCAL_TEMP_PREFIX + tmpNumber;


      while (funcScope.findExistingName(tmpIdent) != null) {
        tmpNumber++;
        tmpIdent = LOCAL_TEMP_PREFIX + tmpNumber;
      }


      tmpName = funcScope.declareName(tmpIdent);


      JsVar var = new JsVar(sourceInfo, tmpName);
      pendingLocals.add(var);
      return tmpName;
    }

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  public String optimizeJavaScript(TreeLogger logger, String program)
      throws UnableToCompleteException {
    logger = logger.branch(TreeLogger.DEBUG, "Attempting to optimize JS", null);
    Reader r = new StringReader(program);
    JsProgram jsProgram = new JsProgram();
    JsScope topScope = jsProgram.getScope();
    JsName funcName = topScope.declareName(getModuleFunctionName());
    funcName.setObfuscatable(false);


    try {
      SourceInfo sourceInfo = jsProgram.createSourceInfo(1,
          "StandardLinkerContext.optimizeJavaScript");

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         * the same function has been inlined in multiple places within the
         * function so we'll use a counter for disambiguation.
         */
        String ident;
        String base = invokedFunction.getName() + "_" + name.getIdent();
        JsScope scope = callerFunction.getScope();
        HashMap<String, Integer> startIdent = startIdentForScope.get(scope);
        if (startIdent == null) {
          startIdent = new HashMap<String, Integer>();
          startIdentForScope.put(scope, startIdent);
        }


        Integer s = startIdent.get(base);
        int suffix = (s == null) ? 0 : s.intValue();
        do {
          ident = base + "_" + suffix++;
        } while (scope.findExistingName(ident) != null);
        startIdent.put(base, suffix);


        JsName newName = scope.declareName(ident, name.getShortIdent());
        v.setReplacementName(name, newName);
        nameIterator.set(newName);
      }
      op = v.accept(op);

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      JsFunction context) {
    /*
     * If the caller contains no nested functions, none of its locals can
     * possibly be affected by side effects.
     */
    JsScope safeScope = null;
    if (context != null && !containsNestedFunctions(context)) {
      safeScope = context.getScope();
    }
    AffectedBySideEffectsVisitor v = new AffectedBySideEffectsVisitor(safeScope);
    v.acceptList(list);

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    }


    @Override
    public void endVisit(JLocal x, Context ctx) {
      // locals can conflict, that's okay just reuse the same variable
      JsScope scope = peek();
      JsName jsName = scope.declareName(x.getName());
      names.put(x, jsName);
    }

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