original

[gb-231r1-is01/GB_2.3_IS01.git] / cts / tools / dasm / src / java_cup / production_part.java

diff --git a/cts/tools/dasm/src/java_cup/production_part.java b/cts/tools/dasm/src/java_cup/production_part.java
new file mode 100644 (file)
index 0000000..cdb92f7
--- /dev/null
+++ b/cts/tools/dasm/src/java_cup/production_part.java
@@ -0,0 +1,94 @@
+package java_cup;
+
+/** This class represents one part (either a symbol or an action) of a 
+ *  production.  In this base class it contains only an optional label 
+ *  string that the user can use to refer to the part within actions.<p>
+ *
+ *  This is an abstract class.
+ *
+ * @see     java_cup.production
+ * @version last updated: 11/25/95
+ * @author  Scott Hudson
+ */
+public abstract class production_part {
+
+  /*-----------------------------------------------------------*/
+  /*--- Constructor(s) ----------------------------------------*/
+  /*-----------------------------------------------------------*/
+       
+  /** Simple constructor. */
+  public production_part(String lab)
+    {
+      _label = lab;
+    }
+
+  /*-----------------------------------------------------------*/
+  /*--- (Access to) Instance Variables ------------------------*/
+  /*-----------------------------------------------------------*/
+       
+  /** Optional label for referring to the part within an action (null for 
+   *  no label). 
+   */
+  protected String _label;
+
+  /** Optional label for referring to the part within an action (null for 
+   *  no label). 
+   */
+  public String label() {return _label;}
+
+  /*-----------------------------------------------------------*/
+  /*--- General Methods ---------------------------------------*/
+  /*-----------------------------------------------------------*/
+       
+  /** Indicate if this is an action (rather than a symbol).  Here in the 
+   * base class, we don't this know yet, so its an abstract method.
+   */
+  public abstract boolean is_action();
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Equality comparison. */
+  public boolean equals(production_part other)
+    {
+      if (other == null) return false;
+
+      /* compare the labels */
+      if (label() != null)
+    return label().equals(other.label());
+      else
+    return other.label() == null;
+    }
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Generic equality comparison. */
+  public boolean equals(Object other)
+    {
+      if (!(other instanceof production_part))
+        return false;
+      else
+    return equals((production_part)other);
+    }
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Produce a hash code. */
+  public int hashCode()
+    {
+      return label()==null ? 0 : label().hashCode();
+    }
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Convert to a string. */
+  public String toString()
+    {
+      if (label() != null)
+    return label() + ":";
+      else
+    return " ";
+    }
+
+  /*-----------------------------------------------------------*/
+
+};