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// Copyright ©2020 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Ragel grammar definition derived from http://www.w3.org/TR/n-quads/#sec-grammar.
%%{
machine nquads;
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
;
BLANK_NODE_LABEL = (PN_CHARS_U | [0-9]) ((PN_CHARS | '.')* PN_CHARS)? ;
BLANK_NODE = '_:' BLANK_NODE_LABEL ;
ECHAR = ('\\' [tbnrf"'\\]) ;
UCHAR = ('\\u' xdigit {4}
| '\\U' xdigit {8})
;
STRING_LITERAL = (
0x00 .. 0x09
| 0x0b .. 0x0c
| 0x0e .. '!'
| '#' .. '['
| ']' .. 0x10ffff
| ECHAR
| UCHAR)*
;
STRING_LITERAL_QUOTE = '"' STRING_LITERAL '"' ;
IRI = (
'!' .. ';'
| '='
| '?' .. '['
| ']'
| '_'
| 'a' .. 'z'
| '~'
| 0x80 .. 0x10ffff
| UCHAR)*
;
IRIREF = '<' IRI >StartIRI %EndIRI '>' ;
LANGTAG = '@' [a-zA-Z]+ ('-' [a-zA-Z0-9]+)* ;
whitespace = [ \t] ;
literal = STRING_LITERAL_QUOTE ('^^' IRIREF | LANGTAG)? ;
subject = IRIREF | BLANK_NODE ;
predicate = IRIREF ;
object = IRIREF | BLANK_NODE | literal ;
graphLabel = IRIREF | BLANK_NODE ;
}%%
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