Create quads hierarchy

* Move nquads into quad.
* Create cquads simplified parser in quad.
* Move Triple (renamed Quad) to quad.

Also made sure mongo actually implements BulkLoader.

quad/cquads/cquads.rl

@@ -0,0 +1,106 @@
+// Copyright 2014 The Cayley Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Ragel gramar definition derived from http://www.w3.org/TR/n-quads/#sec-grammar.
+
+%%{
+	machine quads;
+
+	alphtype rune;
+
+	PN_CHARS_BASE           = [A-Za-z]
+							| 0x00c0 .. 0x00d6
+							| 0x00d8 .. 0x00f6
+							| 0x00f8 .. 0x02ff
+							| 0x0370 .. 0x037d
+							| 0x037f .. 0x1fff
+							| 0x200c .. 0x200d
+							| 0x2070 .. 0x218f
+							| 0x2c00 .. 0x2fef
+							| 0x3001 .. 0xd7ff
+							| 0xf900 .. 0xfdcf
+							| 0xfdf0 .. 0xfffd
+							| 0x10000 .. 0xeffff
+							;
+
+	PN_CHARS_U              = PN_CHARS_BASE | '_' | ':' ;
+
+	PN_CHARS                = PN_CHARS_U
+							| '-'
+							| [0-9]
+							| 0xb7
+							| 0x0300 .. 0x036f
+							| 0x203f .. 0x2040
+							;
+
+	ECHAR                   = ('\\' [tbnrf"'\\]) %Escape ;
+
+	UCHAR                   = ('\\u' xdigit {4}
+							| '\\U' xdigit {8}) %Escape
+							;
+
+	BLANK_NODE_LABEL        = '_:' (PN_CHARS_U | [0-9]) ((PN_CHARS | '.')* PN_CHARS)? ;
+
+	STRING_LITERAL          = (
+							  '!'
+							| '#' .. '['
+							| ']' .. 0x7e
+							| 0x80 .. 0x10ffff
+							| ECHAR
+							| UCHAR)+ - ('_:' | any* '.' | '#' any*)
+							;
+
+	STRING_LITERAL_QUOTE    = '"' (
+							  0x00 .. 0x09
+							| 0x0b .. 0x0c
+							| 0x0e .. '!'
+							| '#' .. '['
+							| ']' .. 0x10ffff
+							| ECHAR
+							| UCHAR)*
+							  '"'
+							;
+
+	IRIREF                  = '<' (
+							  '!' .. ';'
+							| '='
+							| '?' .. '['
+							| ']'
+							| '_'
+							| 'a' .. 'z'
+							| '~'
+							| 0x80 .. 0x10ffff
+							| UCHAR)*
+							  '>'
+							;
+
+	LANGTAG                 = '@' [a-zA-Z]+ ('-' [a-zA-Z0-9]+)* ;
+
+	whitespace              = [ \t] ;
+
+	literal                 = STRING_LITERAL | STRING_LITERAL_QUOTE % Quote | STRING_LITERAL_QUOTE ('^^' IRIREF | LANGTAG) ;
+
+	subject                 = (literal | BLANK_NODE_LABEL) ;
+	predicate               = literal ;
+	object                  = (literal | BLANK_NODE_LABEL) ;
+	graphLabel              = (literal | BLANK_NODE_LABEL) ;
+
+	statement := (
+					whitespace*  subject    >StartSubject   %SetSubject
+					whitespace+  predicate  >StartPredicate %SetPredicate
+					whitespace+  object     >StartObject    %SetObject
+					(whitespace+ graphLabel >StartLabel     %SetLabel)?
+					whitespace*  '.' whitespace* ('#' any*)? >Comment
+				 ) %Return @!Error ;
+}%%