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bin/gems/nokogiri-1.18.3-x86_64-linux-gnu/ext/nokogiri/xml_node_set.c

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+#include <nokogiri.h>
+
+VALUE cNokogiriXmlNodeSet ;
+
+static ID decorate ;
+
+static void
+Check_Node_Set_Node_Type(VALUE node)
+{
+  if (!(rb_obj_is_kind_of(node, cNokogiriXmlNode) ||
+        rb_obj_is_kind_of(node, cNokogiriXmlNamespace))) {
+    rb_raise(rb_eArgError, "node must be a Nokogiri::XML::Node or Nokogiri::XML::Namespace");
+  }
+}
+
+
+static
+VALUE
+ruby_object_get(xmlNodePtr c_node)
+{
+  /* see xmlElementType in libxml2 tree.h */
+  switch (c_node->type) {
+    case XML_NAMESPACE_DECL:
+      /* _private is later in the namespace struct */
+      return (VALUE)(((xmlNsPtr)c_node)->_private);
+
+    case XML_DOCUMENT_NODE:
+    case XML_HTML_DOCUMENT_NODE:
+      /* in documents we use _private to store a tuple */
+      if (DOC_RUBY_OBJECT_TEST(((xmlDocPtr)c_node))) {
+        return DOC_RUBY_OBJECT((xmlDocPtr)c_node);
+      }
+      return (VALUE)NULL;
+
+    default:
+      return (VALUE)(c_node->_private);
+  }
+}
+
+
+static void
+xml_node_set_mark(void *data)
+{
+  xmlNodeSetPtr node_set = data;
+  VALUE rb_node;
+  int jnode;
+
+  for (jnode = 0; jnode < node_set->nodeNr; jnode++) {
+    rb_node = ruby_object_get(node_set->nodeTab[jnode]);
+    if (rb_node) {
+      rb_gc_mark(rb_node);
+    }
+  }
+}
+
+static void
+xml_node_set_deallocate(void *data)
+{
+  xmlNodeSetPtr node_set = data;
+  /*
+   * For reasons outlined in xml_namespace.c, here we reproduce xmlXPathFreeNodeSet() except for the
+   * offending call to xmlXPathNodeSetFreeNs().
+   */
+  if (node_set->nodeTab != NULL) {
+    xmlFree(node_set->nodeTab);
+  }
+
+  xmlFree(node_set);
+}
+
+static const rb_data_type_t xml_node_set_type = {
+  .wrap_struct_name = "xmlNodeSet",
+  .function = {
+    .dmark = xml_node_set_mark,
+    .dfree = xml_node_set_deallocate,
+  },
+  .flags = RUBY_TYPED_FREE_IMMEDIATELY,
+};
+
+static VALUE
+xml_node_set_allocate(VALUE klass)
+{
+  return TypedData_Wrap_Struct(klass, &xml_node_set_type, xmlXPathNodeSetCreate(NULL));
+}
+
+/* :nodoc: */
+static VALUE
+rb_xml_node_set_initialize_copy(VALUE rb_self, VALUE rb_other)
+{
+  xmlNodeSetPtr c_self, c_other;
+  VALUE rb_document;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);
+
+  xmlXPathNodeSetMerge(c_self, c_other);
+
+  rb_document = rb_iv_get(rb_other, "@document");
+  if (!NIL_P(rb_document)) {
+    rb_iv_set(rb_self, "@document", rb_document);
+    rb_funcall(rb_document, decorate, 1, rb_self);
+  }
+
+  return rb_self;
+}
+
+static void
+xpath_node_set_del(xmlNodeSetPtr cur, xmlNodePtr val)
+{
+  /*
+   * For reasons outlined in xml_namespace.c, here we reproduce xmlXPathNodeSetDel() except for the
+   * offending call to xmlXPathNodeSetFreeNs().
+   */
+  int i;
+
+  if (cur == NULL) { return; }
+  if (val == NULL) { return; }
+
+  /*
+   * find node in nodeTab
+   */
+  for (i = 0; i < cur->nodeNr; i++)
+    if (cur->nodeTab[i] == val) { break; }
+
+  if (i >= cur->nodeNr) {	/* not found */
+    return;
+  }
+  cur->nodeNr--;
+  for (; i < cur->nodeNr; i++) {
+    cur->nodeTab[i] = cur->nodeTab[i + 1];
+  }
+  cur->nodeTab[cur->nodeNr] = NULL;
+}
+
+/*
+ * call-seq:
+ *  length
+ *
+ * Get the length of the node set
+ */
+static VALUE
+length(VALUE rb_self)
+{
+  xmlNodeSetPtr c_self;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  return c_self ? INT2NUM(c_self->nodeNr) : INT2NUM(0);
+}
+
+/*
+ * call-seq:
+ *  push(node)
+ *
+ * Append +node+ to the NodeSet.
+ */
+static VALUE
+push(VALUE rb_self, VALUE rb_node)
+{
+  xmlNodeSetPtr c_self;
+  xmlNodePtr node;
+
+  Check_Node_Set_Node_Type(rb_node);
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  Noko_Node_Get_Struct(rb_node, xmlNode, node);
+
+  xmlXPathNodeSetAdd(c_self, node);
+
+  return rb_self;
+}
+
+/*
+ *  call-seq:
+ *    delete(node)
+ *
+ *  Delete +node+ from the Nodeset, if it is a member. Returns the deleted node
+ *  if found, otherwise returns nil.
+ */
+static VALUE
+delete (VALUE rb_self, VALUE rb_node)
+{
+  xmlNodeSetPtr c_self;
+  xmlNodePtr node;
+
+  Check_Node_Set_Node_Type(rb_node);
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  Noko_Node_Get_Struct(rb_node, xmlNode, node);
+
+  if (xmlXPathNodeSetContains(c_self, node)) {
+    xpath_node_set_del(c_self, node);
+    return rb_node;
+  }
+  return Qnil ;
+}
+
+
+/*
+ * call-seq:
+ *  &(node_set)
+ *
+ * Set Intersection — Returns a new NodeSet containing nodes common to the two NodeSets.
+ */
+static VALUE
+intersection(VALUE rb_self, VALUE rb_other)
+{
+  xmlNodeSetPtr c_self, c_other ;
+  xmlNodeSetPtr intersection;
+
+  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
+    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
+  }
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);
+
+  intersection = xmlXPathIntersection(c_self, c_other);
+  return noko_xml_node_set_wrap(intersection, rb_iv_get(rb_self, "@document"));
+}
+
+
+/*
+ * call-seq:
+ *  include?(node)
+ *
+ *  Returns true if any member of node set equals +node+.
+ */
+static VALUE
+include_eh(VALUE rb_self, VALUE rb_node)
+{
+  xmlNodeSetPtr c_self;
+  xmlNodePtr node;
+
+  Check_Node_Set_Node_Type(rb_node);
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  Noko_Node_Get_Struct(rb_node, xmlNode, node);
+
+  return (xmlXPathNodeSetContains(c_self, node) ? Qtrue : Qfalse);
+}
+
+
+/*
+ * call-seq:
+ *  |(node_set)
+ *
+ * Returns a new set built by merging the set and the elements of the given
+ * set.
+ */
+static VALUE
+rb_xml_node_set_union(VALUE rb_self, VALUE rb_other)
+{
+  xmlNodeSetPtr c_self, c_other;
+  xmlNodeSetPtr c_new_node_set;
+
+  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
+    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
+  }
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);
+
+  c_new_node_set = xmlXPathNodeSetMerge(NULL, c_self);
+  c_new_node_set = xmlXPathNodeSetMerge(c_new_node_set, c_other);
+
+  return noko_xml_node_set_wrap(c_new_node_set, rb_iv_get(rb_self, "@document"));
+}
+
+/*
+ * call-seq:
+ *  -(node_set)
+ *
+ *  Difference - returns a new NodeSet that is a copy of this NodeSet, removing
+ *  each item that also appears in +node_set+
+ */
+static VALUE
+minus(VALUE rb_self, VALUE rb_other)
+{
+  xmlNodeSetPtr c_self, c_other;
+  xmlNodeSetPtr new;
+  int j ;
+
+  if (!rb_obj_is_kind_of(rb_other, cNokogiriXmlNodeSet)) {
+    rb_raise(rb_eArgError, "node_set must be a Nokogiri::XML::NodeSet");
+  }
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+  TypedData_Get_Struct(rb_other, xmlNodeSet, &xml_node_set_type, c_other);
+
+  new = xmlXPathNodeSetMerge(NULL, c_self);
+  for (j = 0 ; j < c_other->nodeNr ; ++j) {
+    xpath_node_set_del(new, c_other->nodeTab[j]);
+  }
+
+  return noko_xml_node_set_wrap(new, rb_iv_get(rb_self, "@document"));
+}
+
+
+static VALUE
+index_at(VALUE rb_self, long offset)
+{
+  xmlNodeSetPtr c_self;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  if (offset >= c_self->nodeNr || abs((int)offset) > c_self->nodeNr) {
+    return Qnil;
+  }
+
+  if (offset < 0) { offset += c_self->nodeNr ; }
+
+  return noko_xml_node_wrap_node_set_result(c_self->nodeTab[offset], rb_self);
+}
+
+static VALUE
+subseq(VALUE rb_self, long beg, long len)
+{
+  long j;
+  xmlNodeSetPtr c_self;
+  xmlNodeSetPtr new_set ;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  if (beg > c_self->nodeNr) { return Qnil ; }
+  if (beg < 0 || len < 0) { return Qnil ; }
+
+  if ((beg + len) > c_self->nodeNr) {
+    len = c_self->nodeNr - beg ;
+  }
+
+  new_set = xmlXPathNodeSetCreate(NULL);
+  for (j = beg ; j < beg + len ; ++j) {
+    xmlXPathNodeSetAddUnique(new_set, c_self->nodeTab[j]);
+  }
+  return noko_xml_node_set_wrap(new_set, rb_iv_get(rb_self, "@document"));
+}
+
+/*
+ * call-seq:
+ *  [index] -> Node or nil
+ *  [start, length] -> NodeSet or nil
+ *  [range] -> NodeSet or nil
+ *  slice(index) -> Node or nil
+ *  slice(start, length) -> NodeSet or nil
+ *  slice(range) -> NodeSet or nil
+ *
+ * Element reference - returns the node at +index+, or returns a NodeSet
+ * containing nodes starting at +start+ and continuing for +length+ elements, or
+ * returns a NodeSet containing nodes specified by +range+. Negative +indices+
+ * count backward from the end of the +node_set+ (-1 is the last node). Returns
+ * nil if the +index+ (or +start+) are out of range.
+ */
+static VALUE
+slice(int argc, VALUE *argv, VALUE rb_self)
+{
+  VALUE arg ;
+  long beg, len ;
+  xmlNodeSetPtr c_self;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  if (argc == 2) {
+    beg = NUM2LONG(argv[0]);
+    len = NUM2LONG(argv[1]);
+    if (beg < 0) {
+      beg += c_self->nodeNr ;
+    }
+    return subseq(rb_self, beg, len);
+  }
+
+  if (argc != 1) {
+    rb_scan_args(argc, argv, "11", NULL, NULL);
+  }
+  arg = argv[0];
+
+  if (FIXNUM_P(arg)) {
+    return index_at(rb_self, FIX2LONG(arg));
+  }
+
+  /* if arg is Range */
+  switch (rb_range_beg_len(arg, &beg, &len, (long)c_self->nodeNr, 0)) {
+    case Qfalse:
+      break;
+    case Qnil:
+      return Qnil;
+    default:
+      return subseq(rb_self, beg, len);
+  }
+
+  return index_at(rb_self, NUM2LONG(arg));
+}
+
+
+/*
+ * call-seq:
+ *  to_a
+ *
+ * Return this list as an Array
+ */
+static VALUE
+to_array(VALUE rb_self)
+{
+  xmlNodeSetPtr c_self ;
+  VALUE list;
+  int i;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  list = rb_ary_new2(c_self->nodeNr);
+  for (i = 0; i < c_self->nodeNr; i++) {
+    VALUE elt = noko_xml_node_wrap_node_set_result(c_self->nodeTab[i], rb_self);
+    rb_ary_push(list, elt);
+  }
+
+  return list;
+}
+
+/*
+ *  call-seq:
+ *    unlink
+ *
+ * Unlink this NodeSet and all Node objects it contains from their current context.
+ */
+static VALUE
+unlink_nodeset(VALUE rb_self)
+{
+  xmlNodeSetPtr c_self;
+  int j, nodeNr ;
+
+  TypedData_Get_Struct(rb_self, xmlNodeSet, &xml_node_set_type, c_self);
+
+  nodeNr = c_self->nodeNr ;
+  for (j = 0 ; j < nodeNr ; j++) {
+    if (! NOKOGIRI_NAMESPACE_EH(c_self->nodeTab[j])) {
+      VALUE node ;
+      xmlNodePtr node_ptr;
+      node = noko_xml_node_wrap(Qnil, c_self->nodeTab[j]);
+      rb_funcall(node, rb_intern("unlink"), 0); /* modifies the C struct out from under the object */
+      Noko_Node_Get_Struct(node, xmlNode, node_ptr);
+      c_self->nodeTab[j] = node_ptr ;
+    }
+  }
+  return rb_self ;
+}
+
+
+VALUE
+noko_xml_node_set_wrap(xmlNodeSetPtr c_node_set, VALUE document)
+{
+  int j;
+  VALUE rb_node_set ;
+
+  if (c_node_set == NULL) {
+    rb_node_set = xml_node_set_allocate(cNokogiriXmlNodeSet);
+  } else {
+    rb_node_set = TypedData_Wrap_Struct(cNokogiriXmlNodeSet, &xml_node_set_type, c_node_set);
+  }
+
+  if (!NIL_P(document)) {
+    rb_iv_set(rb_node_set, "@document", document);
+    rb_funcall(document, decorate, 1, rb_node_set);
+  }
+
+  if (c_node_set) {
+    /* create ruby objects for all the results, so they'll be marked during the GC mark phase */
+    for (j = 0 ; j < c_node_set->nodeNr ; j++) {
+      noko_xml_node_wrap_node_set_result(c_node_set->nodeTab[j], rb_node_set);
+    }
+  }
+
+  return rb_node_set ;
+}
+
+
+VALUE
+noko_xml_node_wrap_node_set_result(xmlNodePtr node, VALUE node_set)
+{
+  if (NOKOGIRI_NAMESPACE_EH(node)) {
+    return noko_xml_namespace_wrap_xpath_copy((xmlNsPtr)node);
+  } else {
+    return noko_xml_node_wrap(Qnil, node);
+  }
+}
+
+
+xmlNodeSetPtr
+noko_xml_node_set_unwrap(VALUE rb_node_set)
+{
+  xmlNodeSetPtr c_node_set;
+  TypedData_Get_Struct(rb_node_set, xmlNodeSet, &xml_node_set_type, c_node_set);
+  return c_node_set;
+}
+
+
+void
+noko_init_xml_node_set(void)
+{
+  cNokogiriXmlNodeSet = rb_define_class_under(mNokogiriXml, "NodeSet", rb_cObject);
+
+  rb_define_alloc_func(cNokogiriXmlNodeSet, xml_node_set_allocate);
+
+  rb_define_method(cNokogiriXmlNodeSet, "&", intersection, 1);
+  rb_define_method(cNokogiriXmlNodeSet, "-", minus, 1);
+  rb_define_method(cNokogiriXmlNodeSet, "[]", slice, -1);
+  rb_define_method(cNokogiriXmlNodeSet, "delete", delete, 1);
+  rb_define_method(cNokogiriXmlNodeSet, "include?", include_eh, 1);
+  rb_define_method(cNokogiriXmlNodeSet, "length", length, 0);
+  rb_define_method(cNokogiriXmlNodeSet, "push", push, 1);
+  rb_define_method(cNokogiriXmlNodeSet, "slice", slice, -1);
+  rb_define_method(cNokogiriXmlNodeSet, "to_a", to_array, 0);
+  rb_define_method(cNokogiriXmlNodeSet, "unlink", unlink_nodeset, 0);
+  rb_define_method(cNokogiriXmlNodeSet, "|", rb_xml_node_set_union, 1);
+
+  rb_define_private_method(cNokogiriXmlNodeSet, "initialize_copy", rb_xml_node_set_initialize_copy, 1);
+
+  decorate = rb_intern("decorate");
+}