LANGDIR => LANG_DIR.

Author: gkellogg

README.md

@@ -497,7 +497,7 @@ see <https://unlicense.org/> or the accompanying {file:UNLICENSE} file.
 [SPARQL doc]:       https://ruby-rdf.github.io/sparql
 [RDF 1.0]:          https://www.w3.org/TR/2004/REC-rdf-concepts-20040210/
 [RDF 1.1]:          https://www.w3.org/TR/rdf11-concepts/
-[RDF 1.1]:          https://www.w3.org/TR/rdf12-concepts/
+[RDF 1.2]:          https://www.w3.org/TR/rdf12-concepts/
 [SPARQL 1.1]:       https://www.w3.org/TR/sparql11-query/
 [RDF.rb]:           https://ruby-rdf.github.io/
 [RDF::DO]:          https://ruby-rdf.github.io/rdf-do

etc/n-triples.ebnf

@@ -3,14 +3,14 @@ triple            ::= subject predicate object '.'
 subject           ::= IRIREF | BLANK_NODE_LABEL | quotedTriple
 predicate         ::= IRIREF
 object            ::= IRIREF | BLANK_NODE_LABEL | literal | quotedTriple
-literal           ::= STRING_LITERAL_QUOTE ('^^' IRIREF | LANGDIR )?
+literal           ::= STRING_LITERAL_QUOTE ('^^' IRIREF | LANG_DIR )?
 quotedTriple      ::= '<<' subject predicate object '>>'
 
 @terminals
 
 IRIREF            ::=  '<' ([^#x00-#x20<>"{}|^`\] | UCHAR)* '>'
 BLANK_NODE_LABEL  ::= '_:' ( PN_CHARS_U | [0-9] ) ((PN_CHARS|'.')* PN_CHARS)?
-LANGDIR           ::= "@" [a-zA-Z]+ ( "-" [a-zA-Z0-9]+ )* ('--' [a-zA-Z]+)?`
+LANG_DIR          ::= "@" [a-zA-Z]+ ( "-" [a-zA-Z0-9]+ )* ('--' [a-zA-Z]+)?`
 STRING_LITERAL_QUOTE ::= '"' ( [^#x22#x5C#xA#xD] | ECHAR | UCHAR )* '"'
 UCHAR             ::= ( "\u" HEX HEX HEX HEX )
                     | ( "\U" HEX HEX HEX HEX HEX HEX HEX HEX )

lib/rdf/ntriples/reader.rb

@@ -67,7 +67,7 @@ class Reader < RDF::Reader
 
     IRIREF               = /<((?:#{IRI_RANGE}|#{UCHAR})*)>/.freeze
     BLANK_NODE_LABEL     = /_:((?:[0-9]|#{PN_CHARS_U})(?:(?:#{PN_CHARS}|\.)*#{PN_CHARS})?)/.freeze
-    LANGDIR              = /@([a-zA-Z]+(?:-[a-zA-Z0-9]+)*(?:--[a-zA-Z]+)?)/.freeze
+    LANG_DIR             = /@([a-zA-Z]+(?:-[a-zA-Z0-9]+)*(?:--[a-zA-Z]+)?)/.freeze
     STRING_LITERAL_QUOTE = /"((?:[^\"\\\n\r]|#{ECHAR}|#{UCHAR})*)"/.freeze
 
     ST_START              = /^<</.freeze
@@ -78,7 +78,7 @@ class Reader < RDF::Reader
     NODEID                = /^#{BLANK_NODE_LABEL}/.freeze
     URIREF                = /^#{IRIREF}/.freeze
     LITERAL_PLAIN         = /^#{STRING_LITERAL_QUOTE}/.freeze
-    LITERAL_WITH_LANGUAGE = /^#{STRING_LITERAL_QUOTE}#{LANGDIR}/.freeze
+    LITERAL_WITH_LANGUAGE = /^#{STRING_LITERAL_QUOTE}#{LANG_DIR}/.freeze
     LITERAL_WITH_DATATYPE = /^#{STRING_LITERAL_QUOTE}\^\^#{IRIREF}/.freeze
     DATATYPE_URI          = /^\^\^#{IRIREF}/.freeze
     LITERAL               = Regexp.union(LITERAL_WITH_LANGUAGE, LITERAL_WITH_DATATYPE, LITERAL_PLAIN).freeze
@@ -88,7 +88,7 @@ class Reader < RDF::Reader
     END_OF_STATEMENT      = /^\s*\.\s*(?:#.*)?$/.freeze
 
     # LANGTAG is deprecated
-    LANGTAG               = LANGDIR
+    LANGTAG               = LANG_DIR
 
     ##
     # Reconstructs an RDF value from its serialized N-Triples
@@ -294,7 +294,7 @@ def read_literal
       if literal_str = match(LITERAL_PLAIN)
         literal_str = self.class.unescape(literal_str)
         literal = case
-          when lang_dir = match(LANGDIR)
+          when lang_dir = match(LANG_DIR)
             language, direction = lang_dir.split('--')
             RDF::Literal.new(literal_str, language: language, direction: direction)
           when datatype = match(/^(\^\^)/) # FIXME