Checking in stuff

[IRC.git] / Robust / cup / java_cup / parse_action.java

diff --git a/Robust/cup/java_cup/parse_action.java b/Robust/cup/java_cup/parse_action.java
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+++ b/Robust/cup/java_cup/parse_action.java
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+
+package java_cup;
+
+/** This class serves as the base class for entries in a parse action table.  
+ *  Full entries will either be SHIFT(state_num), REDUCE(production), NONASSOC,
+ *  or ERROR. Objects of this base class will default to ERROR, while
+ *  the other three types will be represented by subclasses. 
+ * 
+ * @see     java_cup.reduce_action
+ * @see     java_cup.shift_action
+ * @version last updated: 7/2/96
+ * @author  Frank Flannery
+ */
+
+public class parse_action {
+
+  /*-----------------------------------------------------------*/
+  /*--- Constructor(s) ----------------------------------------*/
+  /*-----------------------------------------------------------*/
+
+  /** Simple constructor. */
+  public parse_action()
+    {
+      /* nothing to do in the base class */
+    }
+
+ 
+  /*-----------------------------------------------------------*/
+  /*--- (Access to) Static (Class) Variables ------------------*/
+  /*-----------------------------------------------------------*/
+
+  /** Constant for action type -- error action. */
+  public static final int ERROR = 0;
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Constant for action type -- shift action. */
+  public static final int SHIFT = 1;
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Constants for action type -- reduce action. */
+  public static final int REDUCE = 2;
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Constants for action type -- reduce action. */
+  public static final int NONASSOC = 3;
+
+  /*-----------------------------------------------------------*/
+  /*--- General Methods ---------------------------------------*/
+  /*-----------------------------------------------------------*/
+        
+  /** Quick access to the type -- base class defaults to error. */
+  public int kind() {return ERROR;}
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Equality test. */
+  public boolean equals(parse_action other)
+    {
+      /* we match all error actions */
+      return other != null && other.kind() == ERROR;
+    }
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Generic equality test. */
+  public boolean equals(Object other)
+    {
+      if (other instanceof parse_action)
+       return equals((parse_action)other);
+      else
+       return false;
+    }
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Compute a hash code. */
+  public int hashCode()
+    {
+      /* all objects of this class hash together */
+      return 0xCafe123;
+    }
+
+  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+  /** Convert to string. */
+  public String toString() {return "ERROR";}
+
+  /*-----------------------------------------------------------*/
+}
+