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[pccts] / h / SList.cpp

diff --git a/h/SList.cpp b/h/SList.cpp
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+/*
+ * SList.C
+ *
+ * SOFTWARE RIGHTS
+ *
+ * We reserve no LEGAL rights to SORCERER -- SORCERER is in the public
+ * domain.  An individual or company may do whatever they wish with
+ * source code distributed with SORCERER or the code generated by
+ * SORCERER, including the incorporation of SORCERER, or its output, into
+ * commerical software.
+ * 
+ * We encourage users to develop software with SORCERER.  However, we do
+ * ask that credit is given to us for developing SORCERER.  By "credit",
+ * we mean that if you incorporate our source code into one of your
+ * programs (commercial product, research project, or otherwise) that you
+ * acknowledge this fact somewhere in the documentation, research report,
+ * etc...  If you like SORCERER and have developed a nice tool with the
+ * output, please mention that you developed it using SORCERER.  In
+ * addition, we ask that this header remain intact in our source code.
+ * As long as these guidelines are kept, we expect to continue enhancing
+ * this system and expect to make other tools available as they are
+ * completed.
+ *
+ * PCCTS 1.33
+ * Terence Parr
+ * Parr Research Corporation
+ * with Purdue University and AHPCRC, University of Minnesota
+ * 1992-1995
+ */
+
+#define ANTLR_SUPPORT_CODE
+
+#include "SList.h"
+
+/* Iterate over a list of elements; returns ptr to a new element
+ * in list upon every call and NULL when no more are left.
+ * Very useful like this:
+ *
+ *             cursor = mylist;
+ *             while ( (p=mylist->iterate(&cursor)) ) {
+ *                     // place with element p
+ *             }
+ *
+ * The cursor must be initialized to point to the list to iterate over.
+ */
+void *SList::
+iterate(SListNode **cursor)
+{
+       void *e;
+
+       if ( cursor == NULL || *cursor==NULL ) return NULL;
+       if ( head == *cursor ) { *cursor = (*cursor)->next(); }
+       e = (*cursor)->elem();
+       (*cursor) = (*cursor)->next();
+       return e;
+}
+
+/* add an element to end of list. */
+void SList::
+add(void *e)
+{
+       SListNode *p, *tail;
+       require(e!=NULL, "slist_add: attempting to add NULL list element");
+
+       p = new SListNode;
+       require(p!=NULL, "add: cannot alloc new list node");
+       p->setElem(e);
+       if ( head == NULL )
+       {
+               head = tail = p;
+       }
+       else                                                            /* find end of list */
+       {
+               tail->setNext(p);
+               tail = p;
+       }
+}
+
+void SList::
+lfree()
+{
+       SListNode *p,*q;
+
+       if ( head==NULL ) return;       /* empty list */
+       for (p = head; p!=NULL; p=q)
+       {
+               q = p->next();
+               free(p);
+       }
+}
+
+PCCTS_AST *SList::
+to_ast(SList list)
+{
+       PCCTS_AST *t=NULL, *last=NULL;
+       SListNode *p;
+
+       for (p = head; p!=NULL; p=p->next())
+       {
+               PCCTS_AST *u = (PCCTS_AST *)p->elem();
+               if ( last==NULL ) last = t = u;
+               else { last->setRight(u); last = u; }
+       }
+       return t;
+}