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