Java Name.canEliminate方法代码示例

import com.google.javascript.jscomp.GlobalNamespace.Name; //导入方法依赖的package包/类
/**
 * Updates the first initialization (a.k.a "declaration") of a global name
 * that occurs at a VAR node. See comment for
 * {@link #updateObjLitOrFunctionDeclaration}.
 *
 * @param n An object representing a global name (e.g. "a")
 */
private void updateObjLitOrFunctionDeclarationAtVarNode(Name n) {
  Ref ref = n.declaration;
  String name = ref.node.getString();
  Node rvalue = ref.node.getFirstChild();
  Node varNode = ref.node.getParent();
  Node gramps = varNode.getParent();

  boolean isObjLit = rvalue.getType() == Token.OBJECTLIT;
  int numChanges = 0;

  if (isObjLit) {
    boolean discardKeys = n.aliasingGets == 0;
    numChanges += declareVarsForObjLitValues(
        n, name, rvalue, varNode, gramps.getChildBefore(varNode),
        gramps, discardKeys);
  }

  numChanges += addStubsForUndeclaredProperties(n, name, gramps, varNode);

  if (isObjLit && n.canEliminate()) {
    varNode.removeChild(ref.node);
    if (!varNode.hasChildren()) {
      gramps.removeChild(varNode);
    }
    numChanges++;

    // Clear out the object reference, since we've eliminated it from the
    // parse tree.
    ref.node = null;
  }

  if (numChanges > 0) {
    compiler.reportCodeChange();
  }
}
 

import com.google.javascript.jscomp.GlobalNamespace.Name; //导入方法依赖的package包/类
/**
 * Updates the first initialization (a.k.a "declaration") of a global name
 * that occurs at a VAR node. See comment for
 * {@link #updateObjLitOrFunctionDeclaration}.
 *
 * @param n An object representing a global name (e.g. "a")
 */
private void updateObjLitOrFunctionDeclarationAtVarNode(
    Name n, boolean canCollapseChildNames) {
  if (!canCollapseChildNames) {
    return;
  }

  Ref ref = n.getDeclaration();
  String name = ref.node.getString();
  Node rvalue = ref.node.getFirstChild();
  Node varNode = ref.node.getParent();
  Node gramps = varNode.getParent();

  boolean isObjLit = rvalue.isObjectLit();
  int numChanges = 0;

  if (isObjLit) {
    numChanges += declareVarsForObjLitValues(
        n, name, rvalue, varNode, gramps.getChildBefore(varNode),
        gramps);
  }

  numChanges += addStubsForUndeclaredProperties(n, name, gramps, varNode);

  if (isObjLit && n.canEliminate()) {
    varNode.removeChild(ref.node);
    if (!varNode.hasChildren()) {
      gramps.removeChild(varNode);
    }
    numChanges++;

    // Clear out the object reference, since we've eliminated it from the
    // parse tree.
    ref.node = null;
  }

  if (numChanges > 0) {
    compiler.reportCodeChange();
  }
}
 

import com.google.javascript.jscomp.GlobalNamespace.Name; //导入方法依赖的package包/类
private boolean canEliminate(Name name) {
  if (!name.canEliminate()) {
    return false;
  }

  if (name.props == null
      || name.props.isEmpty()
      || propertyCollapseLevel != PropertyCollapseLevel.MODULE_EXPORT) {
    return true;
  }

  return false;
}
 

import com.google.javascript.jscomp.GlobalNamespace.Name; //导入方法依赖的package包/类
/**
 * Updates the first initialization (a.k.a "declaration") of a global name
 * that occurs at an ASSIGN node. See comment for
 * {@link #updateObjLitOrFunctionDeclaration}.
 *
 * @param n An object representing a global name (e.g. "a", "a.b.c")
 * @param alias The flattened name for {@code n} (e.g. "a", "a$b$c")
 */
private void updateObjLitOrFunctionDeclarationAtAssignNode(
    Name n, String alias) {
  // NOTE: It's important that we don't add additional nodes
  // (e.g. a var node before the exprstmt) because the exprstmt might be
  // the child of an if statement that's not inside a block).

  Ref ref = n.declaration;
  Node rvalue = ref.node.getNext();
  Node varNode = new Node(Token.VAR);
  Node varParent = ref.node.getAncestor(3);
  Node gramps = ref.node.getAncestor(2);
  boolean isObjLit = rvalue.getType() == Token.OBJECTLIT;

  if (isObjLit && n.canEliminate()) {
    // Eliminate the object literal altogether.
    varParent.replaceChild(gramps, varNode);
    ref.node = null;

  } else {
    if (rvalue.getType() == Token.FUNCTION) {
      checkForHosedThisReferences(rvalue, n.docInfo, n);
    }

    ref.node.getParent().removeChild(rvalue);

    Node nameNode = NodeUtil.newName(
        alias, ref.node.getAncestor(2), n.fullName());

    if (ref.node.getLastChild().getBooleanProp(Node.IS_CONSTANT_NAME)) {
      nameNode.putBooleanProp(Node.IS_CONSTANT_NAME, true);
    }

    varNode.addChildToBack(nameNode);
    nameNode.addChildToFront(rvalue);
    varParent.replaceChild(gramps, varNode);

    // Update the node ancestry stored in the reference.
    ref.node = nameNode;
  }

  if (isObjLit) {
    boolean discardKeys = n.aliasingGets == 0;
    declareVarsForObjLitValues(
        n, alias, rvalue,
        varNode, varParent.getChildBefore(varNode), varParent,
        discardKeys);
  }

  addStubsForUndeclaredProperties(n, alias, varParent, varNode);

  if (!varNode.hasChildren()) {
    varParent.removeChild(varNode);
  }

  compiler.reportCodeChange();
}
 

import com.google.javascript.jscomp.GlobalNamespace.Name; //导入方法依赖的package包/类
/**
 * Updates the first initialization (a.k.a "declaration") of a global name
 * that occurs at an ASSIGN node. See comment for
 * {@link #updateObjLitOrFunctionDeclaration}.
 *
 * @param n An object representing a global name (e.g. "a", "a.b.c")
 * @param alias The flattened name for {@code n} (e.g. "a", "a$b$c")
 */
private void updateObjLitOrFunctionDeclarationAtAssignNode(
    Name n, String alias, boolean canCollapseChildNames) {
  // NOTE: It's important that we don't add additional nodes
  // (e.g. a var node before the exprstmt) because the exprstmt might be
  // the child of an if statement that's not inside a block).

  Ref ref = n.getDeclaration();
  Node rvalue = ref.node.getNext();
  Node varNode = new Node(Token.VAR);
  Node varParent = ref.node.getAncestor(3);
  Node gramps = ref.node.getAncestor(2);
  boolean isObjLit = rvalue.isObjectLit();
  boolean insertedVarNode = false;

  if (isObjLit && n.canEliminate()) {
    // Eliminate the object literal altogether.
    varParent.replaceChild(gramps, varNode);
    ref.node = null;
    insertedVarNode = true;

  } else if (!n.isSimpleName()) {
    // Create a VAR node to declare the name.
    if (rvalue.isFunction()) {
      checkForHosedThisReferences(rvalue, n.docInfo, n);
    }

    ref.node.getParent().removeChild(rvalue);

    Node nameNode = NodeUtil.newName(
        compiler.getCodingConvention(),
        alias, ref.node.getAncestor(2), n.getFullName());

    JSDocInfo info = ref.node.getParent().getJSDocInfo();
    if (ref.node.getLastChild().getBooleanProp(Node.IS_CONSTANT_NAME) ||
        (info != null && info.isConstant())) {
      nameNode.putBooleanProp(Node.IS_CONSTANT_NAME, true);
    }

    if (info != null) {
      varNode.setJSDocInfo(info);
    }
    varNode.addChildToBack(nameNode);
    nameNode.addChildToFront(rvalue);
    varParent.replaceChild(gramps, varNode);

    // Update the node ancestry stored in the reference.
    ref.node = nameNode;
    insertedVarNode = true;
  }

  if (canCollapseChildNames) {
    if (isObjLit) {
      declareVarsForObjLitValues(
          n, alias, rvalue,
          varNode, varParent.getChildBefore(varNode), varParent);
    }

    addStubsForUndeclaredProperties(n, alias, varParent, varNode);
  }

  if (insertedVarNode) {
    if (!varNode.hasChildren()) {
      varParent.removeChild(varNode);
    }
    compiler.reportCodeChange();
  }
}