Review

finding-17

/mubench/checkouts/closure/319/build/src/com/google/javascript/jscomp/NameAnalyzer.java

createNameInformation(NodeTraversal, Node, Node)

class NameAnalyzer {
  /**
   * Creates name information for the current node during a traversal.
   *
   * @param t The node traversal
   * @param n The current node
   * @param parent The parent of n
   * @return The name information, or null if the name is irrelevant to this
   *     pass
   */
  private NameInformation createNameInformation(NodeTraversal t, Node n,
      Node parent) {
    // Build the full name and find its root node by iterating down through all
    // GETPROP/GETELEM nodes.
    String name = "";
    Node rootNameNode = n;
    boolean bNameWasShortened = false;
    while (NodeUtil.isGet(rootNameNode)) {
      Node prop = rootNameNode.getLastChild();
      if (rootNameNode.getType() == Token.GETPROP) {
        name = "." + prop.getString() + name;
      } else {
        // We consider the name to be "a.b" in a.b['c'] or a.b[x].d.
        bNameWasShortened = true;
        name = "";
      }
      rootNameNode = rootNameNode.getFirstChild();
    }

    // Check whether this is a class-defining call. Classes may only be defined
    // in the global scope.
    if (NodeUtil.isCall(parent) && t.inGlobalScope()) {
      CodingConvention convention = compiler.getCodingConvention();
      SubclassRelationship classes = convention.getClassesDefinedByCall(parent);
      if (classes != null) {
        NameInformation nameInfo = new NameInformation();
        nameInfo.name = classes.subclassName;
        nameInfo.onlyAffectsClassDef = true;
        nameInfo.superclass = classes.superclassName;
        return nameInfo;
      }

      String singletonGetterClass =
          convention.getSingletonGetterClassName(parent);
      if (singletonGetterClass != null) {
        NameInformation nameInfo = new NameInformation();
        nameInfo.name = singletonGetterClass;
        nameInfo.onlyAffectsClassDef = true;
        return nameInfo;
      }
    }

    switch (rootNameNode.getType()) {
      case Token.NAME:
        // Check whether this is an assignment to a prototype property
        // of an object defined in the global scope.
        if (!bNameWasShortened &&
            n.getType() == Token.GETPROP &&
            parent.getType() == Token.ASSIGN &&
            "prototype".equals(n.getLastChild().getString())) {
          if (createNameInformation(t, n.getFirstChild(), n) != null) {
            name = rootNameNode.getString() + name;
            name = name.substring(0, name.length() - PROTOTYPE_SUFFIX_LEN);
            NameInformation nameInfo = new NameInformation();
            nameInfo.name = name;
            return nameInfo;
          } else {
            return null;
          }
        }
        return createNameInformation(
            rootNameNode.getString() + name, t.getScope(), rootNameNode);
      case Token.THIS:
        if (t.inGlobalScope()) {
          NameInformation nameInfo = new NameInformation();
          if (name.indexOf('.') == 0) {
            nameInfo.name = name.substring(1);  // strip leading "."
          } else {
            nameInfo.name = name;
          }
          nameInfo.isExternallyReferenceable = true;
          return nameInfo;
        }
        return null;
      default:
        return null;
    }
  }

}