class RDF::NQuads::Format

N-Quads format specification.

@example Obtaining an NQuads format class

RDF::Format.for(:nquads)     #=> RDF::NQuads::Format
RDF::Format.for("etc/doap.nq")
RDF::Format.for(file_name:      "etc/doap.nq")
RDF::Format.for(file_extension: "nq")
RDF::Format.for(content_type:   "application/n-quads")

@see www.w3.org/TR/n-quads/ @since 0.4.0

Public Class Methods

detect(sample) click to toggle source

Sample detection to see if it matches N-Quads (or N-Triples)

Use a text sample to detect the format of an input file. Sub-classes implement a matcher sufficient to detect probably format matches, including disambiguating between other similar formats.

@param [String] sample Beginning several bytes (about 1K) of input. @return [Boolean]

# File lib/rdf/nquads.rb, line 39
def self.detect(sample)
  sample.match?(%r(
    (?:\s*(?:<[^>]*>) | (?:_:\w+))                          # Subject
    \s*
    (?:\s*<[^>]*>)                                          # Predicate
    \s*
    (?:(?:<[^>]*>) | (?:_:\w+) | (?:"[^"\n]*"(?:^^|@\S+)?)) # Object
    \s*
    (?:\s*(?:<[^>]*>) | (?:_:\w+))                          # Graph Name
    \s*\.
  )x) && !(
    sample.match?(%r(@(base|prefix|keywords)|\{)) ||         # Not Turtle/N3/TriG
    sample.match?(%r(<(html|rdf))i)                          # Not HTML or XML
  )
end
name() click to toggle source

Human readable name for this format

# File lib/rdf/nquads.rb, line 56
def self.name; "N-Quads"; end