content: /* Alloy Analyzer 4 -- Copyright (c) 2006-2009, Felix Chang
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files
   * (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify,
   * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
   * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
   * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  package edu.mit.csail.sdg.ast;
  
  import edu.mit.csail.sdg.alloy4.Pos;
  
  /**
   * Immutable; represents a named entity (such as a Field, or a LET or
   * QUANTIFICATION variable, or a function/predicate parameter).
   */
  
  public abstract class ExprHasName extends Expr {
  
      /**
       * The label associated with this object; it's used for pretty-printing and does
       * not have to be unique.
       */
      public final String label;
  
      /** Constructs an ExprHasName object */
      ExprHasName(Pos pos, String label, Type type) {
          super(pos, null, false, type, 0, 0, null);
          this.label = (label == null ? "" : label);
      }
  
      /** {@inheritDoc} */
      @Override
      public final boolean isSame(Expr obj) {
          while (obj instanceof ExprUnary && ((ExprUnary) obj).op == ExprUnary.Op.NOOP)
              obj = ((ExprUnary) obj).sub;
          return this == obj;
      }
  
      /** {@inheritDoc} */
      @Override
      public final Pos span() {
          return pos;
      }
  
      /** {@inheritDoc} */
      @Override
      public final int getDepth() {
          return 1;
      }
  }
  