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# File 'lib/jekyll-rdfa.rb', line 9
def generate(site)
require 'fileutils'
require 'json'
require 'json/ld'
require 'rdf'
require 'rdf/turtle'
require 'rdf/rdfa'
converter = site.getConverterImpl(Jekyll::Converters::Markdown)
graph = RDF::Graph.new
site.posts.each do |post|
html = converter.convert(post.content)
attribs = {}
attribs[:vocab] = post.data["vocab"] if post.data.member? "vocab"
needs_typeof = false
if post.data.member? "resource"
attribs[:resource] = post.data["resource"]
needs_typeof = true
end
if post.data.member? "about"
attribs[:about] = post.data["about"]
needs_typeof = true
end
if post.data.member? "typeof" and needs_typeof
attribs[:typeof] = post.data["typeof"]
end
if post.data.member? "prefix"
prefixes = post.data["prefix"]
.to_a.map { |key, value| "#{key}: #{value}" }
.join " "
attribs[:prefix] = prefixes
end
unless attribs.empty?
markup = attribs
.to_a
.map { |key, value| " #{key}='#{value}'"}
.join ""
html = "<div#{markup}>#{html}</div>"
end
count = 0
RDF::Reader.for(:rdfa).new(html) do |reader|
reader.each_statement do |statement|
graph << statement
count += 1
end
end
end
dirname = "_linked-data"
FileUtils.mkpath(dirname) unless File.exists?(dirname)
File.open("#{dirname}/posts.ttl", 'w') do |file|
file.write(graph.to_ttl)
end
site.static_files << Jekyll::StaticFile.new(
site, "_linked-data", "", "posts.ttl"
)
File.open("#{dirname}/posts.json", 'w') do |file|
file.write(graph.dump(:jsonld, standard_prefixes: true))
end
site.static_files << Jekyll::StaticFile.new(
site, "_linked-data", "", "posts.json"
)
end
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