Class: Nokogiri::HTML4::Document

Inherits:
XML::Document show all
Defined in:
lib/nokogiri/html4/document.rb,
ext/nokogiri/html4_document.c

Direct Known Subclasses

Nokogiri::HTML5::Document

Constant Summary

Constants inherited from XML::Document

XML::Document::NCNAME_CHAR, XML::Document::NCNAME_RE, XML::Document::NCNAME_START_CHAR

Constants inherited from XML::Node

XML::Node::ATTRIBUTE_DECL, XML::Node::ATTRIBUTE_NODE, XML::Node::CDATA_SECTION_NODE, XML::Node::COMMENT_NODE, XML::Node::DECONSTRUCT_KEYS, XML::Node::DECONSTRUCT_METHODS, XML::Node::DOCB_DOCUMENT_NODE, XML::Node::DOCUMENT_FRAG_NODE, XML::Node::DOCUMENT_NODE, XML::Node::DOCUMENT_TYPE_NODE, XML::Node::DTD_NODE, XML::Node::ELEMENT_DECL, XML::Node::ELEMENT_NODE, XML::Node::ENTITY_DECL, XML::Node::ENTITY_NODE, XML::Node::ENTITY_REF_NODE, XML::Node::HTML_DOCUMENT_NODE, XML::Node::NAMESPACE_DECL, XML::Node::NOTATION_NODE, XML::Node::PI_NODE, XML::Node::TEXT_NODE, XML::Node::XINCLUDE_END, XML::Node::XINCLUDE_START

Constants included from ClassResolver

ClassResolver::VALID_NAMESPACES

Constants included from XML::Searchable

XML::Searchable::LOOKS_LIKE_XPATH

Constants included from XML::PP::Node

XML::PP::Node::COLLECTIONS

Instance Attribute Summary

Attributes inherited from XML::Document

#errors, #namespace_inheritance

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from XML::Document

#add_child, #canonicalize, #collect_namespaces, #create_cdata, #create_comment, #create_element, #create_entity, #create_text_node, #deconstruct_keys, #decorate, #decorators, #document, #dup, #encoding, #encoding=, #initialize, #name, #namespaces, #remove_namespaces!, #root, #root=, #slop!, #url, #validate, #version

Methods inherited from XML::Node

#<<, #<=>, #==, #[], #[]=, #accept, #add_child, #add_class, #add_namespace_definition, #add_next_sibling, #add_previous_sibling, #after, #ancestors, #append_class, #attribute, #attribute_nodes, #attribute_with_ns, #attributes, #before, #blank?, #canonicalize, #cdata?, #child, #children, #children=, #classes, #comment?, #content, #content=, #create_external_subset, #create_internal_subset, #css_path, #deconstruct_keys, #decorate!, #default_namespace=, #description, #do_xinclude, #document, #document?, #dup, #each, #element?, #element_children, #encode_special_chars, #external_subset, #first_element_child, #fragment?, #html?, #initialize, #inner_html, #inner_html=, #internal_subset, #key?, #keys, #kwattr_add, #kwattr_append, #kwattr_remove, #kwattr_values, #lang, #lang=, #last_element_child, #line, #line=, #matches?, #namespace, #namespace=, #namespace_definitions, #namespace_scopes, #namespaced_key?, #namespaces, #native_content=, #next_element, #next_sibling, #node_name, #node_name=, #node_type, #parent, #parent=, #parse, #path, #pointer_id, #prepend_child, #previous_element, #previous_sibling, #processing_instruction?, #read_only?, #remove_attribute, #remove_class, #replace, #swap, #text?, #to_html, #to_s, #to_xhtml, #to_xml, #traverse, #unlink, #value?, #values, #wrap, #write_html_to, #write_to, #write_xhtml_to, #write_xml_to, #xml?

Methods included from ClassResolver

#related_class

Methods included from XML::Searchable

#>, #at, #at_css, #at_xpath, #css, #search, #xpath

Methods included from XML::PP::Node

#inspect, #pretty_print

Methods included from Nokogiri::HTML5::Node

#inner_html, #write_to

Constructor Details

This class inherits a constructor from Nokogiri::XML::Document

Class Method Details

.new ⇒ Object

Create a new document



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
 
# File 'ext/nokogiri/html4_document.c', line 14

static VALUE
rb_html_document_s_new(int argc, VALUE *argv, VALUE klass)
{
  VALUE uri, external_id, rest, rb_doc;
  htmlDocPtr doc;

  rb_scan_args(argc, argv, "0*", &rest);
  uri = rb_ary_entry(rest, (long)0);
  external_id = rb_ary_entry(rest, (long)1);

  doc = htmlNewDoc(
          RTEST(uri) ? (const xmlChar *)StringValueCStr(uri) : NULL,
          RTEST(external_id) ? (const xmlChar *)StringValueCStr(external_id) : NULL
        );
  rb_doc = noko_xml_document_wrap_with_init_args(klass, doc, argc, argv);
  return rb_doc ;
}

.parse(string_or_io, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML) {|options| ... } ⇒ Object

Parse HTML. string_or_io may be a String, or any object that responds to read and close such as an IO, or StringIO. url is resource where this document is located. encoding is the encoding that should be used when processing the document. options is a number that sets options in the parser, such as Nokogiri::XML::ParseOptions::RECOVER. See the constants in Nokogiri::XML::ParseOptions.

Yields:

  • (options) 


172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
 
# File 'lib/nokogiri/html4/document.rb', line 172

def parse(string_or_io, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML)
  options = Nokogiri::XML::ParseOptions.new(options) if Integer === options
  yield options if block_given?

  url ||= string_or_io.respond_to?(:path) ? string_or_io.path : nil

  if string_or_io.respond_to?(:encoding)
    unless string_or_io.encoding == Encoding::ASCII_8BIT
      encoding ||= string_or_io.encoding.name
    end
  end

  if string_or_io.respond_to?(:read)
    if string_or_io.is_a?(Pathname)
      # resolve the Pathname to the file and open it as an IO object, see #2110
      string_or_io = string_or_io.expand_path.open
      url ||= string_or_io.path
    end

    unless encoding
      string_or_io = EncodingReader.new(string_or_io)
      begin
        return read_io(string_or_io, url, encoding, options.to_i)
      rescue EncodingReader::EncodingFound => e
        encoding = e.found_encoding
      end
    end
    return read_io(string_or_io, url, encoding, options.to_i)
  end

  # read_memory pukes on empty docs
  if string_or_io.nil? || string_or_io.empty?
    return encoding ? new.tap { |i| i.encoding = encoding } : new
  end

  encoding ||= EncodingReader.detect_encoding(string_or_io)

  read_memory(string_or_io, url, encoding, options.to_i)
end

.read_io(io, url, encoding, options) ⇒ Object

Read the HTML document from io with given url, encoding, and options. See Nokogiri::HTML4.parse



39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
 
# File 'ext/nokogiri/html4_document.c', line 39

static VALUE
rb_html_document_s_read_io(VALUE klass, VALUE rb_io, VALUE rb_url, VALUE rb_encoding, VALUE rb_options)
{
  VALUE rb_doc;
  VALUE rb_error_list = rb_ary_new();
  htmlDocPtr c_doc;
  const char *c_url = NIL_P(rb_url) ? NULL : StringValueCStr(rb_url);
  const char *c_encoding = NIL_P(rb_encoding) ? NULL : StringValueCStr(rb_encoding);
  int options = NUM2INT(rb_options);

  xmlSetStructuredErrorFunc((void *)rb_error_list, Nokogiri_error_array_pusher);

  c_doc = htmlReadIO(noko_io_read, noko_io_close, (void *)rb_io, c_url, c_encoding, options);

  xmlSetStructuredErrorFunc(NULL, NULL);

  /*
   * If EncodingFound has occurred in EncodingReader, make sure to do
   * a cleanup and propagate the error.
   */
  if (rb_respond_to(rb_io, id_encoding_found)) {
    VALUE encoding_found = rb_funcall(rb_io, id_encoding_found, 0);
    if (!NIL_P(encoding_found)) {
      xmlFreeDoc(c_doc);
      rb_exc_raise(encoding_found);
    }
  }

  if ((c_doc == NULL) || (!(options & XML_PARSE_RECOVER) && (RARRAY_LEN(rb_error_list) > 0))) {
    VALUE rb_error ;

    xmlFreeDoc(c_doc);

    rb_error = rb_ary_entry(rb_error_list, 0);
    if (rb_error == Qnil) {
      rb_raise(rb_eRuntimeError, "Could not parse document");
    } else {
      VALUE exception_message = rb_funcall(rb_error, id_to_s, 0);
      exception_message = rb_str_concat(rb_str_new2("Parser without recover option encountered error or warning: "),
                                        exception_message);
      rb_exc_raise(rb_class_new_instance(1, &exception_message, cNokogiriXmlSyntaxError));
    }

    return Qnil;
  }

  rb_doc = noko_xml_document_wrap(klass, c_doc);
  rb_iv_set(rb_doc, "@errors", rb_error_list);
  return rb_doc;
}

.read_memory(string, url, encoding, options) ⇒ Object

Read the HTML document contained in string with given url, encoding, and options. See Nokogiri::HTML4.parse



97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
 
# File 'ext/nokogiri/html4_document.c', line 97

static VALUE
rb_html_document_s_read_memory(VALUE klass, VALUE rb_html, VALUE rb_url, VALUE rb_encoding, VALUE rb_options)
{
  VALUE rb_doc;
  VALUE rb_error_list = rb_ary_new();
  htmlDocPtr c_doc;
  const char *c_buffer = StringValuePtr(rb_html);
  const char *c_url = NIL_P(rb_url) ? NULL : StringValueCStr(rb_url);
  const char *c_encoding = NIL_P(rb_encoding) ? NULL : StringValueCStr(rb_encoding);
  int html_len = (int)RSTRING_LEN(rb_html);
  int options = NUM2INT(rb_options);

  xmlSetStructuredErrorFunc((void *)rb_error_list, Nokogiri_error_array_pusher);

  c_doc = htmlReadMemory(c_buffer, html_len, c_url, c_encoding, options);

  xmlSetStructuredErrorFunc(NULL, NULL);

  if ((c_doc == NULL) || (!(options & XML_PARSE_RECOVER) && (RARRAY_LEN(rb_error_list) > 0))) {
    VALUE rb_error ;

    xmlFreeDoc(c_doc);

    rb_error = rb_ary_entry(rb_error_list, 0);
    if (rb_error == Qnil) {
      rb_raise(rb_eRuntimeError, "Could not parse document");
    } else {
      VALUE exception_message = rb_funcall(rb_error, id_to_s, 0);
      exception_message = rb_str_concat(rb_str_new2("Parser without recover option encountered error or warning: "),
                                        exception_message);
      rb_exc_raise(rb_class_new_instance(1, &exception_message, cNokogiriXmlSyntaxError));
    }

    return Qnil;
  }

  rb_doc = noko_xml_document_wrap(klass, c_doc);
  rb_iv_set(rb_doc, "@errors", rb_error_list);
  return rb_doc;
}

Instance Method Details

#fragment(tags = nil) ⇒ Object

Create a Nokogiri::XML::DocumentFragment from tags



149
150
151
 
# File 'lib/nokogiri/html4/document.rb', line 149

def fragment(tags = nil)
  DocumentFragment.new(self, tags, root)
end

#meta_encoding ⇒ Object

Get the meta tag encoding for this document. If there is no meta tag, then nil is returned.



12
13
14
15
16
17
18
 
# File 'lib/nokogiri/html4/document.rb', line 12

def meta_encoding
  if (meta = at_xpath("//meta[@charset]"))
    meta[:charset]
  elsif (meta = meta_content_type)
    meta["content"][/charset\s*=\s*([\w-]+)/i, 1]
  end
end

#meta_encoding=(encoding) ⇒ Object

Set the meta tag encoding for this document.

If an meta encoding tag is already present, its content is replaced with the given text.

Otherwise, this method tries to create one at an appropriate place supplying head and/or html elements as necessary, which is inside a head element if any, and before any text node or content element (typically <body>) if any.

The result when trying to set an encoding that is different from the document encoding is undefined.

Beware in CRuby, that libxml2 automatically inserts a meta tag into a head element.



36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/nokogiri/html4/document.rb', line 36

def meta_encoding=(encoding)
  if (meta = meta_content_type)
    meta["content"] = format("text/html; charset=%s", encoding)
    encoding
  elsif (meta = at_xpath("//meta[@charset]"))
    meta["charset"] = encoding
  else
    meta = XML::Node.new("meta", self)
    if (dtd = internal_subset) && dtd.html5_dtd?
      meta["charset"] = encoding
    else
      meta["http-equiv"] = "Content-Type"
      meta["content"] = format("text/html; charset=%s", encoding)
    end

    if (head = at_xpath("//head"))
      head.prepend_child(meta)
    else
      set_metadata_element(meta)
    end
    encoding
  end
end

#serialize(options = {}) ⇒ Object

Serialize Node using options. Save options can also be set using a block.

See also Nokogiri::XML::Node::SaveOptions and Node@Serialization+and+Generating+Output.

These two statements are equivalent:

node.serialize(:encoding => 'UTF-8', :save_with => FORMAT | AS_XML)

or

node.serialize(:encoding => 'UTF-8') do |config|
  config.format.as_xml
end



142
143
144
145
 
# File 'lib/nokogiri/html4/document.rb', line 142

def serialize(options = {})
  options[:save_with] ||= XML::Node::SaveOptions::DEFAULT_HTML
  super
end

#title ⇒ Object

Get the title string of this document. Return nil if there is no title tag.



70
71
72
 
# File 'lib/nokogiri/html4/document.rb', line 70

def title
  (title = at_xpath("//title")) && title.inner_text
end

#title=(text) ⇒ Object

Set the title string of this document.

If a title element is already present, its content is replaced with the given text.

Otherwise, this method tries to create one at an appropriate place supplying head and/or html elements as necessary, which is inside a head element if any, right after a meta encoding/charset tag if any, and before any text node or content element (typically <body>) if any.



85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/nokogiri/html4/document.rb', line 85

def title=(text)
  tnode = XML::Text.new(text, self)
  if (title = at_xpath("//title"))
    title.children = tnode
    return text
  end

  title = XML::Node.new("title", self) << tnode
  if (head = at_xpath("//head"))
    head << title
  elsif (meta = (at_xpath("//meta[@charset]") || meta_content_type))
    # better put after charset declaration
    meta.add_next_sibling(title)
  else
    set_metadata_element(title)
  end
end

#type ⇒ Object

The type for this document



144
145
146
147
148
149
 
# File 'ext/nokogiri/html4_document.c', line 144

static VALUE
rb_html_document_type(VALUE self)
{
  htmlDocPtr doc = noko_xml_document_unwrap(self);
  return INT2NUM(doc->type);
}

#xpath_doctype ⇒ Object

:call-seq:

xpath_doctype() → Nokogiri::CSS::XPathVisitor::DoctypeConfig
Returns

The document type which determines CSS-to-XPath translation.

See XPathVisitor for more information.



159
160
161
 
# File 'lib/nokogiri/html4/document.rb', line 159

def xpath_doctype
  Nokogiri::CSS::XPathVisitor::DoctypeConfig::HTML4
end