Module: Taurus::XML

Defined in:
lib/taurus/xml.rb,
lib/taurus/xml/ffi.rb,
lib/taurus/xml/sax.rb,
lib/taurus/xml/c14n.rb,
lib/taurus/xml/css_to_xpath.rb

Defined Under Namespace

Modules: CssToXPath, FFI, SAX, Searchable Classes: Attr, CDATA, Comment, DocType, Document, DocumentFragment, Element, Error, Namespace, Node, NodeSet, ParseError, ParseOptions, ProcessingInstruction, Text, UseAfterFreeError, XPathError

Class Method Summary collapse

Class Method Details

.c14n_build_ns_pointer(inclusive_namespaces) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Builds a NULL-terminated const char** from a Ruby array of strings, suitable for passing to taurus_c14n_canonicalize_ex's inclusive_ns_prefixes argument. Returns [pointer, anchor] where anchor is the underlying MemoryPointer that the caller must keep alive (e.g. via local variable) for the duration of the FFI call.



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# File 'lib/taurus/xml/c14n.rb', line 12

def self.c14n_build_ns_pointer(inclusive_namespaces)
  return [nil, nil] if inclusive_namespaces.nil? || inclusive_namespaces.empty?
  strs = Array(inclusive_namespaces).map(&:to_s)
  ptr_size = ::FFI.type_size(:pointer)
  buffer = ::FFI::MemoryPointer.new(:pointer, strs.size + 1)
  anchors = strs.map { |s| ::FFI::MemoryPointer.from_string(s) }
  anchors.each_with_index { |p, i| buffer.put_pointer(i * ptr_size, p) }
  buffer.put_pointer(strs.size * ptr_size, nil)
  [buffer, anchors]
end