tree.c   [plain text]


/* -----------------------------------------------------------------------------
 * See the LICENSE file for information on copyright, usage and redistribution
 * of SWIG, and the README file for authors - http://www.swig.org/release.html.
 *
 * tree.c
 *
 * This file provides some general purpose functions for manipulating
 * parse trees.
 * ----------------------------------------------------------------------------- */

char cvsroot_tree_c[] = "$Id: tree.c 11080 2009-01-24 13:15:51Z bhy $";

#include "swig.h"
#include <stdarg.h>
#include <assert.h>

/* -----------------------------------------------------------------------------
 * Swig_print_tags()
 *
 * Dump the tag structure of a parse tree to standard output
 * ----------------------------------------------------------------------------- */

void Swig_print_tags(DOH *obj, DOH *root) {
  DOH *croot, *newroot;
  DOH *cobj;

  if (!root)
    croot = NewStringEmpty();
  else
    croot = root;

  while (obj) {
    Printf(stdout, "%s . %s (%s:%d)\n", croot, nodeType(obj), Getfile(obj), Getline(obj));
    cobj = firstChild(obj);
    if (cobj) {
      newroot = NewStringf("%s . %s", croot, nodeType(obj));
      Swig_print_tags(cobj, newroot);
      Delete(newroot);
    }
    obj = nextSibling(obj);
  }
  if (!root)
    Delete(croot);
}

static int indent_level = 0;

static void print_indent(int l) {
  int i;
  for (i = 0; i < indent_level; i++) {
    fputc(' ', stdout);
  }
  if (l) {
    fputc('|', stdout);
    fputc(' ', stdout);
  }
}


/* -----------------------------------------------------------------------------
 * Swig_print_node(Node *n)
 * ----------------------------------------------------------------------------- */

void Swig_print_node(Node *obj) {
  Iterator ki;
  Node *cobj;

  print_indent(0);
  Printf(stdout, "+++ %s ----------------------------------------\n", nodeType(obj));
  ki = First(obj);
  while (ki.key) {
    String *k = ki.key;
    if ((Cmp(k, "nodeType") == 0) || (Cmp(k, "firstChild") == 0) || (Cmp(k, "lastChild") == 0) ||
	(Cmp(k, "parentNode") == 0) || (Cmp(k, "nextSibling") == 0) || (Cmp(k, "previousSibling") == 0) || (*(Char(k)) == '$')) {
      /* Do nothing */
    } else if (Cmp(k, "parms") == 0) {
      print_indent(2);
      Printf(stdout, "%-12s - %s\n", k, ParmList_protostr(Getattr(obj, k)));
    } else {
      DOH *o;
      char *trunc = "";
      print_indent(2);
      if (DohIsString(Getattr(obj, k))) {
	o = Str(Getattr(obj, k));
	if (Len(o) > 80) {
	  trunc = "...";
	}
	Printf(stdout, "%-12s - \"%(escape)-0.80s%s\"\n", k, o, trunc);
	Delete(o);
      } else {
	Printf(stdout, "%-12s - 0x%x\n", k, Getattr(obj, k));
      }
    }
    ki = Next(ki);
  }
  cobj = firstChild(obj);
  if (cobj) {
    indent_level += 6;
    Printf(stdout, "\n");
    Swig_print_tree(cobj);
    indent_level -= 6;
  } else {
    print_indent(1);
    Printf(stdout, "\n");
  }
}

/* -----------------------------------------------------------------------------
 * Swig_print_tree()
 *
 * Dump the tree structure of a parse tree to standard output
 * ----------------------------------------------------------------------------- */

void Swig_print_tree(DOH *obj) {
  while (obj) {
    Swig_print_node(obj);
    obj = nextSibling(obj);
  }
}

/* -----------------------------------------------------------------------------
 * appendChild()
 *
 * Appends a new child to a node
 * ----------------------------------------------------------------------------- */

void appendChild(Node *node, Node *chd) {
  Node *lc;

  if (!chd)
    return;

  lc = lastChild(node);
  if (!lc) {
    set_firstChild(node, chd);
  } else {
    set_nextSibling(lc, chd);
    set_previousSibling(chd, lc);
  }
  while (chd) {
    lc = chd;
    set_parentNode(chd, node);
    chd = nextSibling(chd);
  }
  set_lastChild(node, lc);
}

/* -----------------------------------------------------------------------------
 * prependChild()
 *
 * Prepends a new child to a node
 * ----------------------------------------------------------------------------- */

void prependChild(Node *node, Node *chd) {
  Node *fc;

  if (!chd)
    return;

  fc = firstChild(node);
  if (fc) {
    set_nextSibling(chd, fc);
    set_previousSibling(fc, chd);
  }
  set_firstChild(node, chd);
  while (chd) {
    set_parentNode(chd, node);
    chd = nextSibling(chd);
  }
}

/* -----------------------------------------------------------------------------
 * removeNode()
 *
 * Removes a node from the parse tree.  Detaches it from its parent's child list.
 * ----------------------------------------------------------------------------- */

void removeNode(Node *n) {
  Node *parent;
  Node *prev;
  Node *next;

  parent = parentNode(n);
  if (!parent) return;

  prev = previousSibling(n);
  next = nextSibling(n);
  if (prev) {
    set_nextSibling(prev, next);
  } else {
    if (parent) {
      set_firstChild(parent, next);
    }
  }
  if (next) {
    set_previousSibling(next, prev);
  } else {
    if (parent) {
      set_lastChild(parent, prev);
    }
  }

  /* Delete attributes */
  Delattr(n,"parentNode");
  Delattr(n,"nextSibling");
  Delattr(n,"prevSibling");
}

/* -----------------------------------------------------------------------------
 * copyNode()
 *
 * Copies a node, but only copies simple attributes (no lists, hashes).
 * ----------------------------------------------------------------------------- */

Node *copyNode(Node *n) {
  Iterator ki;
  Node *c = NewHash();
  for (ki = First(n); ki.key; ki = Next(ki)) {
    if (DohIsString(ki.item)) {
      Setattr(c, ki.key, Copy(ki.item));
    }
  }
  Setfile(c, Getfile(n));
  Setline(c, Getline(n));
  return c;
}

/* -----------------------------------------------------------------------------
 * checkAttribute()
 * ----------------------------------------------------------------------------- */

int checkAttribute(Node *n, const_String_or_char_ptr name, const_String_or_char_ptr value) {
  String *v = Getattr(n, name);
  return v ? Equal(v, value) : 0;
}

/* -----------------------------------------------------------------------------
 * Swig_require()
 * ns   - namespace for the view name for saving any attributes under
 * n    - node
 * ...  - list of attribute names of type char*
 * This method checks that the attribute names exist in the node n and asserts if
 * not. Assert will only occur unless the attribute is optional. An attribute is
 * optional if it is prefixed by ?, eg "?value". If the attribute name is prefixed
 * by * or ?, eg "*value" then a copy of the attribute is saved. The saved
 * attributes will be restored on a subsequent call to Swig_restore(). All the
 * saved attributes are saved in the view namespace (prefixed by ns).
 * This function can be called more than once with different namespaces.
 * ----------------------------------------------------------------------------- */

void Swig_require(const char *ns, Node *n, ...) {
  va_list ap;
  char *name;
  DOH *obj;

  va_start(ap, n);
  name = va_arg(ap, char *);
  while (name) {
    int newref = 0;
    int opt = 0;
    if (*name == '*') {
      newref = 1;
      name++;
    } else if (*name == '?') {
      newref = 1;
      opt = 1;
      name++;
    }
    obj = Getattr(n, name);
    if (!opt && !obj) {
      Printf(stderr, "%s:%d. Fatal error (Swig_require).  Missing attribute '%s' in node '%s'.\n", Getfile(n), Getline(n), name, nodeType(n));
      assert(obj);
    }
    if (!obj)
      obj = DohNone;
    if (newref) {
      /* Save a copy of the attribute */
      Setattr(n, NewStringf("%s:%s", ns, name), obj);
    }
    name = va_arg(ap, char *);
  }
  va_end(ap);

  /* Save the view */
  {
    String *view = Getattr(n, "view");
    if (view) {
      if (Strcmp(view, ns) != 0) {
	Setattr(n, NewStringf("%s:view", ns), view);
	Setattr(n, "view", ns);
      }
    } else {
      Setattr(n, "view", ns);
    }
  }
}


/* -----------------------------------------------------------------------------
 * Swig_save()
 * Same as Swig_require(), but all attribute names are optional and all attributes
 * are saved, ie behaves as if all the attribute names were prefixed by ?.
 * ----------------------------------------------------------------------------- */

void Swig_save(const char *ns, Node *n, ...) {
  va_list ap;
  char *name;
  DOH *obj;

  va_start(ap, n);
  name = va_arg(ap, char *);
  while (name) {
    if (*name == '*') {
      name++;
    } else if (*name == '?') {
      name++;
    }
    obj = Getattr(n, name);
    if (!obj)
      obj = DohNone;

    /* Save a copy of the attribute */
    if (Setattr(n, NewStringf("%s:%s", ns, name), obj)) {
      Printf(stderr, "Swig_save('%s','%s'): Warning, attribute '%s' was already saved.\n", ns, nodeType(n), name);
    }
    name = va_arg(ap, char *);
  }
  va_end(ap);

  /* Save the view */
  {
    String *view = Getattr(n, "view");
    if (view) {
      if (Strcmp(view, ns) != 0) {
	Setattr(n, NewStringf("%s:view", ns), view);
	Setattr(n, "view", ns);
      }
    } else {
      Setattr(n, "view", ns);
    }
  }
}

/* -----------------------------------------------------------------------------
 * Swig_restore()
 * Restores attributes saved by a previous call to Swig_require() or Swig_save().
 * ----------------------------------------------------------------------------- */

void Swig_restore(Node *n) {
  String *temp;
  int len;
  List *l;
  String *ns;
  Iterator ki;

  ns = Getattr(n, "view");
  assert(ns);

  l = NewList();

  temp = NewStringf("%s:", ns);
  len = Len(temp);

  for (ki = First(n); ki.key; ki = Next(ki)) {
    if (Strncmp(temp, ki.key, len) == 0) {
      Append(l, ki.key);
    }
  }
  for (ki = First(l); ki.item; ki = Next(ki)) {
    DOH *obj = Getattr(n, ki.item);
    Setattr(n, Char(ki.item) + len, obj);
    Delattr(n, ki.item);
  }
  Delete(l);
  Delete(temp);
}