extensions.rb in sxp-1.2.1

- old
+ new

@@ -53,15 +53,31 @@
 
 ##
 # Extensions for Ruby's `String` class.
 class String
   ##
-  # Returns the SXP representation of this object.
+  # Returns the SXP representation of this object. Uses SPARQL-like escaping.
   #
   # @return [String]
   def to_sxp(**options)
-    inspect
+    buffer = ""
+    each_char do |u|
+      buffer << case u.ord
+      when (0x00..0x07) then sprintf("\\u%04X", u.ord)
+      when (0x08)       then '\b'
+      when (0x09)       then '\t'
+      when (0x0A)       then '\n'
+      when (0x0C)       then '\f'
+      when (0x0D)       then '\r'
+      when (0x0E..0x1F) then sprintf("\\u%04X", u.ord)
+      when (0x22)       then '\"'
+      when (0x5C)       then '\\\\'
+      when (0x7F)       then sprintf("\\u%04X", u.ord)
+      else u.chr
+      end
+    end
+    '"' + buffer + '"'
   end
 end
 
 ##
 # Extensions for Ruby's `Symbol` class.
@@ -227,11 +243,11 @@
     end
   end
 
   class RDF::URI
     ##
-    # Returns the SXP representation of this a URI. Uses Lexical representation, if set, otherwise, any PName match, otherwise, the relativized version of the URI if a base_uri is given, otherwise just the URI.
+    # Returns the SXP representation of this URI. Uses Lexical representation, if set, otherwise, any PName match, otherwise, the relativized version of the URI if a base_uri is given, otherwise just the URI.
     #
     # @param [Hash{Symbol => RDF::URI}] prefixes(nil)
     # @param [RDF::URI] base_uri(nil)
     # @return [String]
     def to_sxp(prefixes: nil, base_uri: nil, **options)
@@ -266,10 +282,10 @@
       case datatype
       when RDF::XSD.boolean, RDF::XSD.integer, RDF::XSD.double, RDF::XSD.decimal, RDF::XSD.time
         # Retain stated lexical form if possible
         valid? ? to_s : object.to_sxp(**options)
       else
-        text = value.dump
+        text = value.to_sxp
         text << "@#{language}" if self.has_language?
         text << "^^#{datatype.to_sxp(**options)}" if self.has_datatype?
         text
       end
     end