Review

18

com/google/javascript/jscomp/MethodCompilerPass.java

visit(NodeTraversal, Node, Node)

class MethodCompilerPass.GetExternMethods {
    public void visit(NodeTraversal t, Node n, Node parent) {
      switch (n.getType()) {
        case Token.GETPROP:
        case Token.GETELEM: {
          Node dest = n.getFirstChild().getNext();

          if (dest.getType() != Token.STRING) {
            return;
          }

          String name = dest.getString();

          // We have a signature. Parse tree of the form:
          // assign                       <- parent
          //      getprop                 <- n
          //          name methods
          //          string setTimeout
          //      function
          if (parent.getType() == Token.ASSIGN &&
              parent.getFirstChild() == n &&
              n.getNext().getType() == Token.FUNCTION) {
            addSignature(name, n.getNext(), t.getSourceName());
          } else {
            getSignatureStore().removeSignature(name);
            externMethodsWithoutSignatures.add(name);
          }

          externMethods.add(name);
        } break;

        case Token.OBJECTLIT: {
          for (Node key = n.getFirstChild(); key != null; key = key.getNext()) {
            if (key.getType() != Token.NUMBER) {
              Node value = key.getFirstChild();
              String name = key.getString();
              if (key.getType() == Token.STRING
                  && value.getType() == Token.FUNCTION) {
                addSignature(name, value, t.getSourceName());
              } else {
                getSignatureStore().removeSignature(name);
                externMethodsWithoutSignatures.add(name);
              }
              externMethods.add(name);
            }
          }
        } break;
      }
    }
}

class MethodCompilerPass.GatherSignatures {
    public void visit(NodeTraversal t, Node n, Node parent) {
      switch (n.getType()) {
        case Token.GETPROP:
        case Token.GETELEM:
          Node dest = n.getFirstChild().getNext();

          if (dest.getType() == Token.STRING) {
            if (dest.getString().equals("prototype")) {
              processPrototypeParent(t, parent);
            } else {
              // Static methods of the form Foo.bar = function() {} or
              // Static methods of the form Foo.bar = baz (where baz is a
              // function name). Parse tree looks like:
              // assign                 <- parent
              //      getprop           <- n
              //          name Foo
              //          string bar
              //      function or name  <- n.getNext()
              if (parent.getType() == Token.ASSIGN &&
                  parent.getFirstChild() == n) {
                addPossibleSignature(dest.getString(), n.getNext(), t);
              }
            }
          }
          break;

        case Token.OBJECTLIT:
          for (Node key = n.getFirstChild(); key != null; key = key.getNext()) {
            switch(key.getType()) {
              case Token.STRING:
                addPossibleSignature(key.getString(), key.getFirstChild(), t);
                break;
              case Token.SET:
              case Token.GET:
                nonMethodProperties.add(key.getString());
                break;
              case Token.NUMBER:
                // Ignore numberic keys.
                break;
              default:
                throw new IllegalStateException(
                    "unexpect OBJECTLIT key: " + key);
            }
          }
          break;
      }
    }

}