Class: LibXML::XML::Reader

Inherits:
Object
  • Object
show all
Defined in:
ext/libxml/ruby_xml_reader.c,
lib/libxml/reader.rb,
ext/libxml/ruby_xml_reader.c

Overview

The XML::Reader class provides a simpler, alternative way of parsing an XML document in contrast to XML::Parser or XML::SaxParser. A XML::Reader instance acts like a cursor going forward in a document stream, stopping at each node it encounters. To advance to the next node, simply cadd XML::Reader#read.

The XML::Reader API closely matches the DOM Core specification and supports namespaces, xml:base, entity handling and DTDs.

To summarize, XML::Reader provides a far simpler API to use versus XML::SaxParser and is more memory efficient than using XML::Parser to create a DOM tree.

Example:

parser = XML::Reader.string("<foo><bar>1</bar><bar>2</bar><bar>3</bar></foo>")
reader.read
assert_equal('foo', reader.name)
assert_equal(nil, reader.value)

3.times do |i|
  reader.read
  assert_equal(XML::Reader::TYPE_ELEMENT, reader.node_type)
  assert_equal('bar', reader.name)
  reader.read
  assert_equal(XML::Reader::TYPE_TEXT, reader.node_type)
  assert_equal((i + 1).to_s, reader.value)
  reader.read
  assert_equal(XML::Reader::TYPE_END_ELEMENT, reader.node_type)
end

You can also parse documents (see XML::Reader.document), strings (see XML::Parser.string) and io objects (see XML::Parser.io).

For a more in depth tutorial, albeit in C, see xmlsoft.org/xmlreader.html.

Constant Summary collapse

LOADDTD =

Constants

INT2FIX(XML_PARSER_LOADDTD)
DEFAULTATTRS = 
INT2FIX(XML_PARSER_DEFAULTATTRS)
VALIDATE = 
INT2FIX(XML_PARSER_VALIDATE)
SUBST_ENTITIES = 
INT2FIX(XML_PARSER_SUBST_ENTITIES)
SEVERITY_VALIDITY_WARNING = 
INT2FIX(XML_PARSER_SEVERITY_VALIDITY_WARNING)
SEVERITY_VALIDITY_ERROR = 
INT2FIX(XML_PARSER_SEVERITY_VALIDITY_ERROR)
SEVERITY_WARNING = 
INT2FIX(XML_PARSER_SEVERITY_WARNING)
SEVERITY_ERROR = 
INT2FIX(XML_PARSER_SEVERITY_ERROR)
TYPE_NONE = 
INT2FIX(XML_READER_TYPE_NONE)
TYPE_ELEMENT = 
INT2FIX(XML_READER_TYPE_ELEMENT)
TYPE_ATTRIBUTE = 
INT2FIX(XML_READER_TYPE_ATTRIBUTE)
TYPE_TEXT = 
INT2FIX(XML_READER_TYPE_TEXT)
TYPE_CDATA = 
INT2FIX(XML_READER_TYPE_CDATA)
TYPE_ENTITY_REFERENCE = 
INT2FIX(XML_READER_TYPE_ENTITY_REFERENCE)
TYPE_ENTITY = 
INT2FIX(XML_READER_TYPE_ENTITY)
TYPE_PROCESSING_INSTRUCTION = 
INT2FIX(XML_READER_TYPE_PROCESSING_INSTRUCTION)
TYPE_COMMENT = 
INT2FIX(XML_READER_TYPE_COMMENT)
TYPE_DOCUMENT = 
INT2FIX(XML_READER_TYPE_DOCUMENT)
TYPE_DOCUMENT_TYPE = 
INT2FIX(XML_READER_TYPE_DOCUMENT_TYPE)
TYPE_DOCUMENT_FRAGMENT = 
INT2FIX(XML_READER_TYPE_DOCUMENT_FRAGMENT)
TYPE_NOTATION = 
INT2FIX(XML_READER_TYPE_NOTATION)
TYPE_WHITESPACE = 
INT2FIX(XML_READER_TYPE_WHITESPACE)
TYPE_SIGNIFICANT_WHITESPACE = 
INT2FIX(XML_READER_TYPE_SIGNIFICANT_WHITESPACE)
TYPE_END_ELEMENT = 
INT2FIX(XML_READER_TYPE_END_ELEMENT)
TYPE_END_ENTITY = 
INT2FIX(XML_READER_TYPE_END_ENTITY)
TYPE_XML_DECLARATION = 
INT2FIX(XML_READER_TYPE_XML_DECLARATION)
MODE_INITIAL =

Read states

INT2FIX(XML_TEXTREADER_MODE_INITIAL)
MODE_INTERACTIVE = 
INT2FIX(XML_TEXTREADER_MODE_INTERACTIVE)
MODE_ERROR = 
INT2FIX(XML_TEXTREADER_MODE_ERROR)
MODE_EOF = 
INT2FIX(XML_TEXTREADER_MODE_EOF)
MODE_CLOSED = 
INT2FIX(XML_TEXTREADER_MODE_CLOSED)
MODE_READING = 
INT2FIX(XML_TEXTREADER_MODE_READING)

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.data(string, options = nil) ⇒ Object 



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# File 'lib/libxml/reader.rb', line 21

def self.data(string, options = nil)
  warn("XML::Reader.data is deprecated.  Use XML::Reader.string instead")
  self.string(string, options)
end

.XML::Reader.document(doc) ⇒ XML::Reader

Create an new reader for the specified document.

Returns:



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# File 'ext/libxml/ruby_xml_reader.c', line 76

VALUE rxml_reader_document(VALUE klass, VALUE doc)
{
  xmlDocPtr xdoc;
  xmlTextReaderPtr xreader;

  Data_Get_Struct(doc, xmlDoc, xdoc);

  xreader = xmlReaderWalker(xdoc);

  if (xreader == NULL)
    rxml_raise(&xmlLastError);

  return rxml_reader_wrap(xreader);
}

.XML::Reader.file(path) ⇒ XML::Reader .XML::Reader.file(path, : encoding) ⇒ XML::Encoding::UTF_8

Creates a new reader by parsing the specified file or uri.

You may provide an optional hash table to control how the parsing is performed. Valid options are:

encoding - The document encoding, defaults to nil. Valid values
           are the encoding constants defined on XML::Encoding.
options - Controls the execution of the parser, defaults to 0.
          Valid values are the constants defined on
          XML::Parser::Options.  Mutliple options can be combined
          by using Bitwise OR (|).

Overloads:



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# File 'ext/libxml/ruby_xml_reader.c', line 108

static VALUE rxml_reader_file(int argc, VALUE *argv, VALUE klass)
{
  xmlTextReaderPtr xreader;
  VALUE path;
  VALUE options;

  const char *xencoding = NULL;
  int xoptions = 0;

  rb_scan_args(argc, argv, "11", &path, &options);
  Check_Type(path, T_STRING);

  if (!NIL_P(options))
  {
    VALUE encoding = Qnil;
    VALUE parserOptions = Qnil;

    Check_Type(options, T_HASH);

    encoding = rb_hash_aref(options, BASE_URI_SYMBOL);
    xencoding = NIL_P(encoding) ? NULL : xmlGetCharEncodingName(NUM2INT(encoding));

    parserOptions = rb_hash_aref(options, OPTIONS_SYMBOL);
    xoptions = NIL_P(parserOptions) ? 0 : NUM2INT(parserOptions);
  }

  xreader = xmlReaderForFile(StringValueCStr(path), xencoding, xoptions);

  if (xreader == NULL)
    rxml_raise(&xmlLastError);

  return rxml_reader_wrap(xreader);
}

.XML::Reader.io(io) ⇒ XML::Reader .XML::Reader.io(io, : encoding) ⇒ XML::Encoding::UTF_8

Creates a new reader by parsing the specified io object.

You may provide an optional hash table to control how the parsing is performed. Valid options are:

base_uri - The base url for the parsed document.
encoding - The document encoding, defaults to nil. Valid values
           are the encoding constants defined on XML::Encoding.
options - Controls the execution of the parser, defaults to 0.
          Valid values are the constants defined on
          XML::Parser::Options.  Mutliple options can be combined
          by using Bitwise OR (|).

Overloads:



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# File 'ext/libxml/ruby_xml_reader.c', line 160

static VALUE rxml_reader_io(int argc, VALUE *argv, VALUE klass)
{
  xmlTextReaderPtr xreader;
  VALUE result;
  VALUE io;
  VALUE options;
  char *xbaseurl = NULL;
  const char *xencoding = NULL;
  int xoptions = 0;

  rb_scan_args(argc, argv, "11", &io, &options);

  if (!NIL_P(options))
  {
    VALUE baseurl = Qnil;
    VALUE encoding = Qnil;
    VALUE parserOptions = Qnil;

    Check_Type(options, T_HASH);

    baseurl = rb_hash_aref(options, BASE_URI_SYMBOL);
    xbaseurl = NIL_P(baseurl) ? NULL : StringValueCStr(baseurl);

    encoding = rb_hash_aref(options, ENCODING_SYMBOL);
    xencoding = NIL_P(encoding) ? NULL : xmlGetCharEncodingName(NUM2INT(encoding));

    parserOptions = rb_hash_aref(options, OPTIONS_SYMBOL);
    xoptions = NIL_P(parserOptions) ? 0 : NUM2INT(parserOptions);
  }
  
  xreader = xmlReaderForIO((xmlInputReadCallback) rxml_read_callback, NULL,
                           (void *) io, 
                           xbaseurl, xencoding, xoptions);

  if (xreader == NULL)
    rxml_raise(&xmlLastError);

  result = rxml_reader_wrap(xreader);

  /* Attach io object to parser so it won't get freed.*/
  rb_ivar_set(result, IO_ATTR, io);

  return result;
}

.XML::Reader.string(io) ⇒ XML::Reader .XML::Reader.string(io, : encoding) ⇒ XML::Encoding::UTF_8

Creates a new reader by parsing the specified string.

You may provide an optional hash table to control how the parsing is performed. Valid options are:

base_uri - The base url for the parsed document.
encoding - The document encoding, defaults to nil. Valid values
           are the encoding constants defined on XML::Encoding.
options - Controls the execution of the parser, defaults to 0.
          Valid values are the constants defined on
          XML::Parser::Options.  Mutliple options can be combined
          by using Bitwise OR (|).

Overloads:



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# File 'ext/libxml/ruby_xml_reader.c', line 223

static VALUE rxml_reader_string(int argc, VALUE *argv, VALUE klass)
{
  xmlTextReaderPtr xreader;
  VALUE string;
  VALUE options;
  char *xbaseurl = NULL;
  const char *xencoding = NULL;
  int xoptions = 0;

  rb_scan_args(argc, argv, "11", &string, &options);
  Check_Type(string, T_STRING);

  if (!NIL_P(options))
  {
    VALUE baseurl = Qnil;
    VALUE encoding = Qnil;
    VALUE parserOptions = Qnil;

    Check_Type(options, T_HASH);

    baseurl = rb_hash_aref(options, BASE_URI_SYMBOL);
    xbaseurl = NIL_P(baseurl) ? NULL : StringValueCStr(baseurl);

    encoding = rb_hash_aref(options, ENCODING_SYMBOL);
    xencoding = NIL_P(encoding) ? NULL : xmlGetCharEncodingName(NUM2INT(encoding));
      
    parserOptions = rb_hash_aref(options, OPTIONS_SYMBOL);
    xoptions = NIL_P(parserOptions) ? 0 : NUM2INT(parserOptions);
  }
  
  xreader = xmlReaderForMemory(StringValueCStr(string), RSTRING_LEN(string), 
                               xbaseurl, xencoding, xoptions);

  if (xreader == NULL)
    rxml_raise(&xmlLastError);

  return rxml_reader_wrap(xreader);
}

.walker(doc) ⇒ Object

:enddoc:



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# File 'lib/libxml/reader.rb', line 16

def self.walker(doc)
  warn("XML::Reader.walker is deprecated.  Use XML::Reader.document instead")
  self.document(doc)
end

Instance Method Details

#[](key) ⇒ Object

Provide the value of the attribute with the specified index (if key is an integer) or with the specified name (if key is a string) relative to the containing element, as a string.



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# File 'ext/libxml/ruby_xml_reader.c', line 746

static VALUE rxml_reader_attribute(VALUE self, VALUE key)
{
  xmlTextReaderPtr reader;
  xmlChar *attr;

  reader = rxml_text_reader_get(self);

  if (TYPE(key) == T_FIXNUM)
  {
    attr = xmlTextReaderGetAttributeNo(reader, FIX2INT(key));
  }
  else
  {
    attr = xmlTextReaderGetAttribute(reader, (const xmlChar *) StringValueCStr(key));
  }
  return (attr == NULL ? Qnil : rb_str_new2((const char*)attr));
}

#attribute_count ⇒ Object

Provide the number of attributes of the current node.



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# File 'ext/libxml/ruby_xml_reader.c', line 574

static VALUE rxml_reader_attr_count(VALUE self)
{
  return INT2FIX(xmlTextReaderAttributeCount(rxml_text_reader_get(self)));
}

#base_uri ⇒ Object

Determine the base URI of the node.



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# File 'ext/libxml/ruby_xml_reader.c', line 611

static VALUE rxml_reader_base_uri(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstBaseUri(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#byte_consumed ⇒ Object

This method provides the current index of the parser used by the reader, relative to the start of the current entity.



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# File 'ext/libxml/ruby_xml_reader.c', line 818

static VALUE
rxml_reader_byte_consumed(VALUE self)
{
  return INT2NUM(xmlTextReaderByteConsumed(rxml_text_reader_get(self)));
}

#close ⇒ Object

This method releases any resources allocated by the current instance changes the state to Closed and close any underlying input.



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# File 'ext/libxml/ruby_xml_reader.c', line 269

static VALUE rxml_reader_close(VALUE self)
{
  return INT2FIX(xmlTextReaderClose(rxml_text_reader_get(self)));
}

#column_number ⇒ Numeric

Provide the column number of the current parsing point.

Returns:

  • (Numeric) 


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# File 'ext/libxml/ruby_xml_reader.c', line 832

static VALUE
rxml_reader_column_number(VALUE self)
{
  return INT2NUM(xmlTextReaderGetParserColumnNumber(rxml_text_reader_get(self)));
}

#default? ⇒ Boolean

Return whether an Attribute node was generated from the default value defined in the DTD or schema.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 858

static VALUE rxml_reader_default(VALUE self)
{
  return xmlTextReaderIsDefault(rxml_text_reader_get(self)) ? Qtrue : Qfalse;
}

#depth ⇒ Object

Get the depth of the node in the tree.



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# File 'ext/libxml/ruby_xml_reader.c', line 659

static VALUE rxml_reader_depth(VALUE self)
{
  return INT2FIX(xmlTextReaderDepth(rxml_text_reader_get(self)));
}

#empty_element? ⇒ Boolean

Check if the current node is empty.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 882

static VALUE rxml_reader_empty_element(VALUE self)
{
  return xmlTextReaderIsEmptyElement(rxml_text_reader_get(self)) ? Qtrue
      : Qfalse;
}

#encoding ⇒ XML::Encoding::UTF_8

Returns the encoding of the document being read. Note you first have to read data from the reader for encoding to return a value

reader = XML::Reader.file(XML_FILE)
assert_nil(reader.encoding)
reader.read
assert_equal(XML::Encoding::UTF_8, reader.encoding)

In addition, libxml always appears to return nil for the encoding when parsing strings.

Returns:



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# File 'ext/libxml/ruby_xml_reader.c', line 595

static VALUE rxml_reader_encoding(VALUE self)
{
  xmlTextReaderPtr xreader = rxml_text_reader_get(self);
  const xmlChar *xencoding = xmlTextReaderConstEncoding(xreader);
  if (xencoding)
    return INT2NUM(xmlParseCharEncoding(xencoding));
  else
    return INT2NUM(XML_CHAR_ENCODING_NONE);
}

#expand ⇒ Object

Read the contents of the current node and the full subtree. It then makes the subtree available until the next read call.

Return an XML::Node object, or nil in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 787

static VALUE rxml_reader_expand(VALUE self)
{
  xmlNodePtr node;
  xmlDocPtr doc;
  xmlTextReaderPtr reader = rxml_text_reader_get(self);
  node = xmlTextReaderExpand(reader);

  if (!node)
    return Qnil;

  /* Okay this is tricky.  By accessing the returned node, we
   take ownership of the reader's document.  Thus we need to
   tell the reader to not free it.  Otherwise it will be
   freed twice - once when the Ruby document wrapper goes
   out of scope and once when the reader goes out of scope. */

  xmlTextReaderPreserve(reader);
  doc = xmlTextReaderCurrentDoc(reader);
  rxml_document_wrap(doc);

  return rxml_node_wrap(node);
}

#has_attributes? ⇒ Boolean

Get whether the node has attributes.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 721

static VALUE rxml_reader_has_attributes(VALUE self)
{
  return xmlTextReaderHasAttributes(rxml_text_reader_get(self)) ? Qtrue
      : Qfalse;
}

#has_value? ⇒ Boolean

Get whether the node can have a text value.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 733

static VALUE rxml_reader_has_value(VALUE self)
{
  return xmlTextReaderHasValue(rxml_text_reader_get(self)) ? Qtrue : Qfalse;
}

#line_number ⇒ Numeric

Provide the line number of the current parsing point.

Returns:

  • (Numeric) 


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# File 'ext/libxml/ruby_xml_reader.c', line 844

static VALUE
rxml_reader_line_number(VALUE self)
{
  return INT2NUM(xmlTextReaderGetParserLineNumber(rxml_text_reader_get(self)));
}

#local_name ⇒ Object

Return the local name of the node.



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# File 'ext/libxml/ruby_xml_reader.c', line 562

static VALUE rxml_reader_local_name(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstLocalName(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#lookup_namespace(prefix) ⇒ Object

Resolve a namespace prefix in the scope of the current element. To return the default namespace, specify nil as prefix.



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# File 'ext/libxml/ruby_xml_reader.c', line 771

static VALUE rxml_reader_lookup_namespace(VALUE self, VALUE prefix)
{
  const xmlChar *result = xmlTextReaderLookupNamespace(rxml_text_reader_get(
      self), (const xmlChar *) StringValueCStr(prefix));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#move_to_attribute(val) ⇒ Object

Move the position of the current instance to the attribute with the specified index (if val is an integer) or name (if val is a string) relative to the containing element.



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# File 'ext/libxml/ruby_xml_reader.c', line 282

static VALUE rxml_reader_move_to_attr(VALUE self, VALUE val)
{
  xmlTextReaderPtr xreader;
  int ret;

  xreader = rxml_text_reader_get(self);

  if (TYPE(val) == T_FIXNUM)
  {
    ret = xmlTextReaderMoveToAttributeNo(xreader, FIX2INT(val));
  }
  else
  {
    ret = xmlTextReaderMoveToAttribute(xreader,
        (const xmlChar *) StringValueCStr(val));
  }

  return INT2FIX(ret);
}

#move_to_element ⇒ Object

Move the position of the current instance to the node that contains the current attribute node.



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# File 'ext/libxml/ruby_xml_reader.c', line 333

static VALUE rxml_reader_move_to_element(VALUE self)
{
  return INT2FIX(xmlTextReaderMoveToElement(rxml_text_reader_get(self)));
}

#move_to_first_attribute ⇒ Object

Move the position of the current instance to the first attribute associated with the current node.



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# File 'ext/libxml/ruby_xml_reader.c', line 309

static VALUE rxml_reader_move_to_first_attr(VALUE self)
{
  return INT2FIX(xmlTextReaderMoveToFirstAttribute(rxml_text_reader_get(self)));
}

#move_to_next_attribute ⇒ Object

Move the position of the current instance to the next attribute associated with the current node.



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# File 'ext/libxml/ruby_xml_reader.c', line 321

static VALUE rxml_reader_move_to_next_attr(VALUE self)
{
  return INT2FIX(xmlTextReaderMoveToNextAttribute(rxml_text_reader_get(self)));
}

#name ⇒ Object

Return the qualified name of the node.



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# File 'ext/libxml/ruby_xml_reader.c', line 550

static VALUE rxml_reader_name(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstName(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#namespace_declaration? ⇒ Boolean

Determine whether the current node is a namespace declaration rather than a regular attribute.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 870

static VALUE rxml_reader_namespace_declaration(VALUE self)
{
  return xmlTextReaderIsNamespaceDecl(rxml_text_reader_get(self)) ? Qtrue
      : Qfalse;
}

#namespace_uri ⇒ Object

Determine the namespace URI of the node.



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# File 'ext/libxml/ruby_xml_reader.c', line 623

static VALUE rxml_reader_namespace_uri(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstNamespaceUri(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#next ⇒ Object

Skip to the node following the current one in document order while avoiding the subtree if any.



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# File 'ext/libxml/ruby_xml_reader.c', line 345

static VALUE rxml_reader_next(VALUE self)
{
  return INT2FIX(xmlTextReaderNext(rxml_text_reader_get(self)));
}

#next_sibling ⇒ Object

Skip to the node following the current one in document order while avoiding the subtree if any. Currently implemented only for Readers built on a document.



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# File 'ext/libxml/ruby_xml_reader.c', line 358

static VALUE rxml_reader_next_sibling(VALUE self)
{
  return INT2FIX(xmlTextReaderNextSibling(rxml_text_reader_get(self)));
}

#node ⇒ XML::Node

Returns the reader’s current node. It will return nil if Reader#read has not yet been called. WARNING - Using this method is dangerous because the the node may be destroyed on the next #read.

Returns:



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# File 'ext/libxml/ruby_xml_reader.c', line 372

static VALUE rxml_reader_node(VALUE self)
{
  xmlTextReaderPtr xreader = rxml_text_reader_get(self);
  xmlNodePtr xnode = xmlTextReaderCurrentNode(xreader);
  return xnode ? rxml_node_wrap(xnode) : Qnil;
}

#node_type ⇒ Object

Get the node type of the current node. Reference: dotgnu.org/pnetlib-doc/System/Xml/XmlNodeType.html



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# File 'ext/libxml/ruby_xml_reader.c', line 386

static VALUE rxml_reader_node_type(VALUE self)
{
  return INT2FIX(xmlTextReaderNodeType(rxml_text_reader_get(self)));
}

#normalization ⇒ Object

The value indicating whether to normalize white space and attribute values. Since attribute value and end of line normalizations are a MUST in the XML specification only the value true is accepted. The broken bahaviour of accepting out of range character entities like &#0; is of course not supported either.

Return 1 or -1 in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 403

static VALUE rxml_reader_normalization(VALUE self)
{
  return INT2FIX(xmlTextReaderNormalization(rxml_text_reader_get(self)));
}

#prefix ⇒ Object

Get a shorthand reference to the namespace associated with the node.



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# File 'ext/libxml/ruby_xml_reader.c', line 647

static VALUE rxml_reader_prefix(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstPrefix(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#quote_char ⇒ String

Get the quotation mark character used to enclose the value of an attribute, as an integer value (and -1 in case of error).

Returns:

  • (String) 


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# File 'ext/libxml/ruby_xml_reader.c', line 671

static VALUE rxml_reader_quote_char(VALUE self)
{
  return INT2FIX(xmlTextReaderQuoteChar(rxml_text_reader_get(self)));
}

#read ⇒ Object

Causes the reader to move to the next node in the stream, exposing its properties.

Returns true if a node was successfully read or false if there are no more nodes to read. On errors, an exception is raised.



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# File 'ext/libxml/ruby_xml_reader.c', line 416

static VALUE rxml_reader_read(VALUE self)
{
  int result = xmlTextReaderRead(rxml_text_reader_get(self));
  switch(result)
  {
    case -1:
      rxml_raise(&xmlLastError);
      return Qnil;
      break;
    case 0:
      return Qfalse;
    case 1:
      return Qtrue;
    default:
      rb_raise(rb_eRuntimeError,
               "xmlTextReaderRead did not return -1, 0 or 1.  Return value was: %d", result);
  }
}

#read_attribute_value ⇒ Object

Parse an attribute value into one or more Text and EntityReference nodes.

Return 1 in case of success, 0 if the reader was not positionned on an attribute node or all the attribute values have been read, or -1 in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 445

static VALUE rxml_reader_read_attr_value(VALUE self)
{
  return INT2FIX(xmlTextReaderReadAttributeValue(rxml_text_reader_get(self)));
}

#read_inner_xml ⇒ Object

Read the contents of the current node, including child nodes and markup.

Return a string containing the XML content, or nil if the current node is neither an element nor attribute, or has no child nodes.



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# File 'ext/libxml/ruby_xml_reader.c', line 459

static VALUE rxml_reader_read_inner_xml(VALUE self)
{
  const xmlChar *result = xmlTextReaderReadInnerXml(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#read_outer_xml ⇒ Object

Read the contents of the current node, including child nodes and markup.

Return a string containing the XML content, or nil if the current node is neither an element nor attribute, or has no child nodes.



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# File 'ext/libxml/ruby_xml_reader.c', line 474

static VALUE rxml_reader_read_outer_xml(VALUE self)
{
  const xmlChar *result = xmlTextReaderReadOuterXml(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#read_state ⇒ Object

Get the read state of the reader.



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# File 'ext/libxml/ruby_xml_reader.c', line 486

static VALUE rxml_reader_read_state(VALUE self)
{
  return INT2FIX(xmlTextReaderReadState(rxml_text_reader_get(self)));
}

#read_string ⇒ String

Read the contents of an element or a text node as a string.

Return a string containing the contents of the Element or Text node, or nil if the reader is positioned on any other type of node.

Returns:

  • (String) 


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# File 'ext/libxml/ruby_xml_reader.c', line 500

static VALUE rxml_reader_read_string(VALUE self)
{
  const xmlChar *result = xmlTextReaderReadString(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#relax_ng_validate(rng) ⇒ Object

Use RelaxNG to validate the document as it is processed. Activation is only possible before the first read. If rng is nil, the RelaxNG validation is desactivated.

Return 0 in case the RelaxNG validation could be (des)activated and -1 in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 517

static VALUE rxml_reader_relax_ng_validate(VALUE self, VALUE rng)
{
  char *xrng = NIL_P(rng) ? NULL : StringValueCStr(rng);
  return INT2FIX(xmlTextReaderRelaxNGValidate(rxml_text_reader_get(self), xrng));
}

#reset_error_handler ⇒ Object 



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# File 'lib/libxml/reader.rb', line 4

def reset_error_handler
  warn('reset_error_handler is deprecated.  Use Error.reset_handler instead')
  Error.reset_handler
end

#schema_validate(schema) ⇒ Object

Use W3C XSD schema to validate the document as it is processed. Activation is only possible before the first read. If schema is nil, then XML Schema validation is desactivated.

Return 0 in case the schemas validation could be (de)activated and -1 in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 535

static VALUE
rxml_reader_schema_validate(VALUE self, VALUE xsd)
{
  char *xxsd = NIL_P(xsd) ? NULL : StringValueCStr(xsd);
  int status = xmlTextReaderSchemaValidate(rxml_text_reader_get(self), xxsd);
  return INT2FIX(status);
}

#set_error_handler(&block) ⇒ Object 



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# File 'lib/libxml/reader.rb', line 9

def set_error_handler(&block)
  warn('set_error_handler is deprecated.  Use Error.set_handler instead')
  Error.set_handler(&block)
end

#standalone ⇒ Object

Determine the standalone status of the document being read.

Return 1 if the document was declared to be standalone, 0 if it was declared to be not standalone, or -1 if the document did not specify its standalone status or in case of error.



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# File 'ext/libxml/ruby_xml_reader.c', line 686

static VALUE rxml_reader_standalone(VALUE self)
{
  return INT2FIX(xmlTextReaderStandalone(rxml_text_reader_get(self)));
}

#valid? ⇒ Boolean

Retrieve the validity status from the parser context.

Returns:

  • (Boolean) 


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# File 'ext/libxml/ruby_xml_reader.c', line 894

static VALUE rxml_reader_valid(VALUE self)
{
  return xmlTextReaderIsValid(rxml_text_reader_get(self)) ? Qtrue : Qfalse;
}

#value ⇒ Object

Provide the text value of the node if present.



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# File 'ext/libxml/ruby_xml_reader.c', line 635

static VALUE rxml_reader_value(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstValue(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#xml_lang ⇒ Object

Get the xml:lang scope within which the node resides.



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# File 'ext/libxml/ruby_xml_reader.c', line 697

static VALUE rxml_reader_xml_lang(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstXmlLang(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}

#xml_version ⇒ Object

Determine the XML version of the document being read.



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# File 'ext/libxml/ruby_xml_reader.c', line 709

static VALUE rxml_reader_xml_version(VALUE self)
{
  const xmlChar *result = xmlTextReaderConstXmlVersion(rxml_text_reader_get(self));
  return (result == NULL ? Qnil : rb_str_new2((const char*)result));
}