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Add new ANTLR parser for RSP queries

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This parser actually supports way more than is needed for RSP proper,
as mt-daapd was piggybacking on the RSP queries for its smart playlists.

As I don't have (yet?) the RSP specs, better safe than sorry here. This
will be revisited at some point. Or not.
This commit is contained in:
Julien BLACHE
2009-06-04 15:45:22 +02:00
parent 272d8bca04
commit f9d9964914
7 changed files with 931 additions and 2 deletions
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148
src/RSP.g Normal file
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/*
* Copyright (C) 2009 Julien BLACHE <jb@jblache.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
grammar RSP;
options {
output = AST;
ASTLabelType = pANTLR3_BASE_TREE;
language = C;
}
query : expr NEWLINE? EOF -> expr
;
expr : aexpr (OR^ aexpr)*
;
aexpr : crit (AND^ crit)*
;
crit : LPAR expr RPAR -> expr
| strcrit
| intcrit
| datecrit
;
strcrit : FIELD strop STR -> ^(strop FIELD STR)
| FIELD NOT strop STR -> ^(NOT ^(strop FIELD STR))
;
strop : EQUAL
| INCLUDES
| STARTSW
| ENDSW
;
intcrit : FIELD intop INT -> ^(intop FIELD INT)
| FIELD NOT intop INT -> ^(NOT ^(intop FIELD INT))
;
intop : EQUAL
| LESS
| GREATER
| LTE
| GTE
;
datecrit: FIELD dateop datespec -> ^(dateop FIELD datespec)
;
dateop : BEFORE
| AFTER
;
datespec: dateref
| INT dateintval dateop dateref -> ^(dateop dateref INT dateintval)
;
dateref : DATE
| TODAY
;
dateintval
: DAY
| WEEK
| MONTH
| YEAR
;
QUOTE : '"';
LPAR : '(';
RPAR : ')';
AND : 'and';
OR : 'or';
NOT : '!';
/* Both string & int */
EQUAL : '=';
/* String */
INCLUDES: 'includes';
STARTSW : 'startswith';
ENDSW : 'endswith';
/* Int */
GREATER : '>';
LESS : '<';
GTE : '>=';
LTE : '<=';
/* Date */
BEFORE : 'before';
AFTER : 'after';
DAY : 'day' | 'days';
WEEK : 'week' | 'weeks';
MONTH : 'month' | 'months';
YEAR : 'year' | 'years';
TODAY : 'today';
NEWLINE : '\r'? '\n';
WS : (' ' | '\t') { $channel = HIDDEN; };
FIELD : 'a'..'z' ('a'..'z' | '_')* 'a'..'z';
INT : DIGIT19 DIGIT09*;
/* YYYY-MM-DD */
DATE : DIGIT19 DIGIT09 DIGIT09 DIGIT09 '-' ('0' DIGIT19 | '1' '0'..'2') '-' ('0' DIGIT19 | '1'..'2' DIGIT09 | '3' '0'..'1');
/*
Unescaping adapted from (ported to the C runtime)
<http://stackoverflow.com/questions/504402/how-to-handle-escape-sequences-in-string-literals-in-antlr-3>
*/
STR
@init{ pANTLR3_STRING unesc = GETTEXT()->factory->newRaw(GETTEXT()->factory); }
: QUOTE ( reg = ~('\\' | '"') { unesc->addc(unesc, reg); }
| esc = ESCAPED { unesc->appendS(unesc, GETTEXT()); } )+ QUOTE { SETTEXT(unesc); }
;
fragment
ESCAPED : '\\'
( '\\' { SETTEXT(GETTEXT()->factory->newStr8(GETTEXT()->factory, (pANTLR3_UINT8)"\\")); }
| '"' { SETTEXT(GETTEXT()->factory->newStr8(GETTEXT()->factory, (pANTLR3_UINT8)"\"")); }
)
;
fragment
DIGIT09 : '0'..'9';
fragment
DIGIT19 : '1'..'9';