Class: Nokogiri::XML::Schema

Inherits:
Object
  • Object
show all
Defined in:
lib/nokogiri/xml/schema.rb,
ext/nokogiri/xml_schema.c

Overview

Nokogiri::XML::Schema is used for validating XML against a schema (usually from an xsd file).

Synopsis

Validate an XML document against a Schema. Loop over the errors that are returned and print them out:

xsd = Nokogiri::XML::Schema(File.read(PO_SCHEMA_FILE))
doc = Nokogiri::XML(File.read(PO_XML_FILE))

xsd.validate(doc).each do |error|
  puts error.message
end

The list of errors are Nokogiri::XML::SyntaxError objects.

NOTE: As of v1.11.0, Schema treats inputs as UNTRUSTED by default, and so external entities are not resolved from the network (‘http://` or `ftp://`). Previously, parsing treated documents as “trusted” by default which was counter to Nokogiri’s “untrusted by default” security policy. If a document is trusted, then the caller may turn off the NONET option via the ParseOptions to re-enable external entity resolution over a network connection.

Direct Known Subclasses

RelaxNG

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#errors ⇒ Object

Errors while parsing the schema file



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# File 'lib/nokogiri/xml/schema.rb', line 39

def errors
  @errors
end

#parse_options ⇒ Object

The Nokogiri::XML::ParseOptions used to parse the schema



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# File 'lib/nokogiri/xml/schema.rb', line 41

def parse_options
  @parse_options
end

Class Method Details

.from_document(document) ⇒ Object

Create a new schema parsed from the document.

Parameters

  • document: Nokogiri::XML::Document to be parsed

Returns

Nokogiri::XML::Schema



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# File 'ext/nokogiri/xml_schema.c', line 205

static VALUE
rb_xml_schema_s_from_document(int argc, VALUE *argv, VALUE klass)
{
  VALUE rb_document;
  VALUE rb_parse_options;
  VALUE rb_schema;
  xmlDocPtr c_document;
  xmlSchemaParserCtxtPtr c_parser_context;
  int defensive_copy_p = 0;

  rb_scan_args(argc, argv, "11", &rb_document, &rb_parse_options);

  if (!rb_obj_is_kind_of(rb_document, cNokogiriXmlNode)) {
    rb_raise(rb_eTypeError,
             "expected parameter to be a Nokogiri::XML::Document, received %"PRIsVALUE,
             rb_obj_class(rb_document));
  }

  if (!rb_obj_is_kind_of(rb_document, cNokogiriXmlDocument)) {
    xmlNodePtr deprecated_node_type_arg;
    // TODO: deprecate allowing Node
    NOKO_WARN_DEPRECATION("Passing a Node as the first parameter to Schema.from_document is deprecated. Please pass a Document instead. This will become an error in a future release of Nokogiri.");
    Noko_Node_Get_Struct(rb_document, xmlNode, deprecated_node_type_arg);
    c_document = deprecated_node_type_arg->doc;
  } else {
    c_document = noko_xml_document_unwrap(rb_document);
  }

  if (noko_xml_document_has_wrapped_blank_nodes_p(c_document)) {
    // see https://github.com/sparklemotion/nokogiri/pull/2001
    c_document = xmlCopyDoc(c_document, 1);
    defensive_copy_p = 1;
  }

  c_parser_context = xmlSchemaNewDocParserCtxt(c_document);
  rb_schema = xml_schema_parse_schema(klass, c_parser_context, rb_parse_options);

  if (defensive_copy_p) {
    xmlFreeDoc(c_document);
    c_document = NULL;
  }

  return rb_schema;
}

.new(string_or_io, options = ParseOptions::DEFAULT_SCHEMA) ⇒ Object

Create a new Nokogiri::XML::Schema object using a string_or_io object.



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# File 'lib/nokogiri/xml/schema.rb', line 46

def self.new(string_or_io, options = ParseOptions::DEFAULT_SCHEMA)
  from_document(Nokogiri::XML(string_or_io), options)
end

.read_memory(string) ⇒ Object

Create a new schema parsed from the contents of string

Parameters

  • string: String containing XML to be parsed as a schema

Returns

Nokogiri::XML::Schema



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# File 'ext/nokogiri/xml_schema.c', line 177

static VALUE
read_memory(int argc, VALUE *argv, VALUE klass)
{
  VALUE rb_content;
  VALUE rb_parse_options;
  xmlSchemaParserCtxtPtr c_parser_context;

  rb_scan_args(argc, argv, "11", &rb_content, &rb_parse_options);

  c_parser_context = xmlSchemaNewMemParserCtxt(
                       (const char *)StringValuePtr(rb_content),
                       (int)RSTRING_LEN(rb_content)
                     );

  return xml_schema_parse_schema(klass, c_parser_context, rb_parse_options);
}

Instance Method Details

#valid?(thing) ⇒ Boolean

Returns true if thing is a valid Nokogiri::XML::Document or file.

Returns:

  • (Boolean) 


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# File 'lib/nokogiri/xml/schema.rb', line 68

def valid?(thing)
  validate(thing).empty?
end

#validate(thing) ⇒ Object

Validate thing against this schema. thing can be a Nokogiri::XML::Document object, or a filename. An Array of Nokogiri::XML::SyntaxError objects found while validating the thing is returned.



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# File 'lib/nokogiri/xml/schema.rb', line 55

def validate(thing)
  if thing.is_a?(Nokogiri::XML::Document)
    validate_document(thing)
  elsif File.file?(thing)
    validate_file(thing)
  else
    raise ArgumentError, "Must provide Nokogiri::Xml::Document or the name of an existing file"
  end
end