Add copyright license information.

[homepage.git] / lib / sgml2xml.rb

diff --git a/lib/sgml2xml.rb b/lib/sgml2xml.rb
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+++ b/lib/sgml2xml.rb
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+# Nick's web site: sgml2xml filter.  Convert SGML tag soup to XML.
+#
+# Copyright © 2018 Nick Bowler
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+class SGMLToXMLFilter < Nanoc::Filter
+    identifier :sgml2xml
+    requires 'nokogiri'
+
+    def run(content, params = {})
+        doc = Nokogiri::HTML(content)
+        doc.internal_subset.remove
+        return doc.to_xml(:save_with =>
+            Nokogiri::XML::Node::SaveOptions::FORMAT |
+            Nokogiri::XML::Node::SaveOptions::AS_XML )
+    end
+end