--- /dev/null
+/* Abstract syntax tree manipulation functions
+ *
+ * SOFTWARE RIGHTS
+ *
+ * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
+ * Set (PCCTS) -- PCCTS is in the public domain. An individual or
+ * company may do whatever they wish with source code distributed with
+ * PCCTS or the code generated by PCCTS, including the incorporation of
+ * PCCTS, or its output, into commerical software.
+ *
+ * We encourage users to develop software with PCCTS. However, we do ask
+ * that credit is given to us for developing PCCTS. 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 PCCTS and have developed a nice tool with the
+ * output, please mention that you developed it using PCCTS. 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.
+ *
+ * ANTLR 1.33
+ * Terence Parr
+ * Parr Research Corporation
+ * with Purdue University and AHPCRC, University of Minnesota
+ * 1989-1995
+ */
+#include <stdio.h>
+#include <stdarg.h>
+
+#define ANTLR_SUPPORT_CODE
+
+#include "ASTBase.h"
+
+/* ensure that tree manipulation variables are current after a rule
+ * reference
+ */
+void
+ASTBase::link(ASTBase **_root, ASTBase **_sibling, ASTBase **_tail)
+{
+ if ( *_sibling == NULL ) return;
+ if ( *_root == NULL ) *_root = *_sibling;
+ else if ( *_root != *_sibling ) (*_root)->_down = *_sibling;
+ if ( *_tail==NULL ) *_tail = *_sibling;
+ while ( (*_tail)->_right != NULL ) *_tail = (*_tail)->_right;
+}
+
+/* add a child node to the current sibling list */
+void
+ASTBase::subchild(ASTBase **_root, ASTBase **_sibling, ASTBase **_tail)
+{
+ if ( *_tail != NULL ) (*_tail)->_right = this;
+ else {
+ *_sibling = this;
+ if ( *_root != NULL ) (*_root)->_down = *_sibling;
+ }
+ *_tail = this;
+ if ( *_root == NULL ) *_root = *_sibling;
+}
+
+/* make a new AST node. Make the newly-created
+ * node the root for the current sibling list. If a root node already
+ * exists, make the newly-created node the root of the current root.
+ */
+void
+ASTBase::subroot(ASTBase **_root, ASTBase **_sibling, ASTBase **_tail)
+{
+ if ( *_root != NULL )
+ if ( (*_root)->_down == *_sibling ) *_sibling = *_tail = *_root;
+ *_root = this;
+ (*_root)->_down = *_sibling;
+}
+
+/* Apply preorder_action(), etc.. to root then each sibling */
+void
+ASTBase::preorder()
+{
+ ASTBase *tree = this;
+
+ while ( tree!= NULL )
+ {
+ if ( tree->_down != NULL ) preorder_before_action();
+ tree->preorder_action();
+ if ( tree->_down!=NULL )
+ {
+ tree->_down->preorder();
+ preorder_after_action();
+ }
+ tree = tree->_right;
+ }
+}
+
+/* free all AST nodes in tree; apply func to each before freeing */
+void
+ASTBase::destroy()
+{
+ ASTBase* tree = this;
+ while (tree) {
+ if (tree->_down) tree->_down->destroy();
+
+ ASTBase* cur = tree;
+ tree = tree->_right;
+ delete cur;
+ }
+}
+
+/* build a tree (root child1 child2 ... NULL)
+ * If root is NULL, simply make the children siblings and return ptr
+ * to 1st sibling (child1). If root is not single node, return NULL.
+ *
+ * Siblings that are actually siblins lists themselves are handled
+ * correctly. For example #( NULL, #( NULL, A, B, C), D) results
+ * in the tree ( NULL A B C D ).
+ *
+ * Requires at least two parameters with the last one being NULL. If
+ * both are NULL, return NULL.
+ */
+ASTBase *
+ASTBase::tmake(ASTBase *root, ...)
+{
+ va_list ap;
+ register ASTBase *child, *sibling=NULL, *tail, *w;
+
+ va_start(ap, root);
+
+ if ( root != NULL )
+ if ( root->_down != NULL ) return NULL;
+ child = va_arg(ap, ASTBase *);
+ while ( child != NULL )
+ {
+ for (w=child; w->_right!=NULL; w=w->_right) {;} /* find end of child */
+ if ( sibling == NULL ) {sibling = child; tail = w;}
+ else {tail->_right = child; tail = w;}
+ child = va_arg(ap, ASTBase *);
+ }
+ if ( root==NULL ) root = sibling;
+ else root->_down = sibling;
+ va_end(ap);
+ return root;
+}
+
+/* tree duplicate */
+// forgot to check for NULL this (TJP July 23,1995)
+ASTBase *
+ASTBase::dup()
+{
+ ASTBase *u, *t=this;
+
+ if ( t == NULL ) return NULL;
+/*
+ u = new ASTBase;
+ *u = *t;
+*/
+ u = (ASTBase *)this->shallowCopy();
+ if ( t->_right!=NULL ) u->_right = t->_right->dup();
+ else u->_right = NULL;
+ if ( t->_down!=NULL ) u->_down = t->_down->dup();
+ else u->_down = NULL;
+ return u;
+}
+
+/* tree duplicate */
+ASTBase *
+ASTDoublyLinkedBase::dup()
+{
+ ASTDoublyLinkedBase *u, *t=this;
+
+ if ( t == NULL ) return NULL;
+/*
+ u = new ASTDoublyLinkedBase;
+ *u = *t;
+*/
+ u = (ASTDoublyLinkedBase *)this->shallowCopy();
+ u->_up = NULL; /* set by calling invocation */
+ u->_left = NULL;
+ u->_right = t->_right->dup();
+ u->_down = t->_down->dup();
+ if ( u->_right!=NULL ) ((ASTDoublyLinkedBase *)u->_right)->_left = u;
+ if ( u->_down!=NULL ) ((ASTDoublyLinkedBase *)u->_down)->_up = u;
+ return u;
+}
+
+/*
+ * Set the 'up', and 'left' pointers of all nodes in 't'.
+ * Initial call is double_link(your_tree, NULL, NULL).
+ */
+void
+ASTDoublyLinkedBase::double_link(ASTBase *left, ASTBase *up)
+{
+ ASTDoublyLinkedBase *t = this;
+
+ t->_left = (ASTDoublyLinkedBase *) left;
+ t->_up = (ASTDoublyLinkedBase *) up;
+ if (t->_down != NULL)
+ ((ASTDoublyLinkedBase *)t->_down)->double_link(NULL, t);
+ if (t->_right != NULL)
+ ((ASTDoublyLinkedBase *)t->_right)->double_link(t, up);
+}
+
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