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| -rw-r--r-- | storage/innobase/fts/fts0pars.y | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/storage/innobase/fts/fts0pars.y b/storage/innobase/fts/fts0pars.y new file mode 100644 index 00000000..deebc79e --- /dev/null +++ b/storage/innobase/fts/fts0pars.y @@ -0,0 +1,293 @@ +/***************************************************************************** + +Copyright (c) 2007, 2014, Oracle and/or its affiliates. All rights reserved. + +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; version 2 of the License. + +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., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA + +*****************************************************************************/ + +/** + * @file fts/fts0pars.y + * FTS parser: input file for the GNU Bison parser generator + * + * Created 2007/5/9 Sunny Bains + */ + +%{ +#include "ha_prototypes.h" +#include "mem0mem.h" +#include "fts0ast.h" +#include "fts0blex.h" +#include "fts0tlex.h" +#include "fts0pars.h" +#include <my_sys.h> + +extern int fts_lexer(YYSTYPE*, fts_lexer_t*); +extern int fts_blexer(YYSTYPE*, yyscan_t); +extern int fts_tlexer(YYSTYPE*, yyscan_t); + + + +extern int ftserror(const char* p); + +/* Required for reentrant parser */ +#define ftslex fts_lexer + +#define YYERROR_VERBOSE + +/* For passing an argument to yyparse() */ +#define YYPARSE_PARAM state +#define YYLEX_PARAM ((fts_ast_state_t*) state)->lexer + + +typedef int (*fts_scanner)(YYSTYPE* val, yyscan_t yyscanner); + +struct fts_lexer_struct { + fts_scanner scanner; + void* yyscanner; +}; + +%} + +%union { + int oper; + fts_ast_string_t* token; + fts_ast_node_t* node; +}; + +/* Enable re-entrant parser */ +%pure_parser + +%token<oper> FTS_OPER +%token<token> FTS_TEXT FTS_TERM FTS_NUMB + +%type<node> prefix term text expr sub_expr expr_lst query + +%nonassoc '+' '-' '~' '<' '>' + +%% + +query : expr_lst { + $$ = $1; + ((fts_ast_state_t*) state)->root = $$; + } + ; + +expr_lst: /* Empty */ { + $$ = NULL; + } + + | expr_lst expr { + $$ = $1; + + if (!$$) { + $$ = fts_ast_create_node_list(state, $2); + } else { + fts_ast_add_node($$, $2); + } + } + + | expr_lst sub_expr { + $$ = $1; + $$ = fts_ast_create_node_list(state, $1); + + if (!$$) { + $$ = $2; + } else { + fts_ast_add_node($$, $2); + } + } + ; + +sub_expr: '(' expr_lst ')' { + $$ = $2; + + if ($$) { + $$ = fts_ast_create_node_subexp_list(state, $$); + } + } + + | prefix '(' expr_lst ')' { + $$ = fts_ast_create_node_list(state, $1); + + if ($3) { + fts_ast_add_node($$, + fts_ast_create_node_subexp_list(state, $3)); + } + } + ; + +expr : term { + $$ = $1; + } + + | text { + $$ = $1; + } + + | term '*' { + fts_ast_term_set_wildcard($1); + } + + | text '@' FTS_NUMB { + fts_ast_text_set_distance($1, fts_ast_string_to_ul($3, 10)); + fts_ast_string_free($3); + } + + | prefix term '*' { + $$ = fts_ast_create_node_list(state, $1); + fts_ast_add_node($$, $2); + fts_ast_term_set_wildcard($2); + } + + | prefix term { + $$ = fts_ast_create_node_list(state, $1); + fts_ast_add_node($$, $2); + } + + | prefix text '@' FTS_NUMB { + $$ = fts_ast_create_node_list(state, $1); + fts_ast_add_node($$, $2); + fts_ast_text_set_distance($2, fts_ast_string_to_ul($4, 10)); + fts_ast_string_free($4); + } + + | prefix text { + $$ = fts_ast_create_node_list(state, $1); + fts_ast_add_node($$, $2); + } + ; + +prefix : '-' { + $$ = fts_ast_create_node_oper(state, FTS_IGNORE); + } + + | '+' { + $$ = fts_ast_create_node_oper(state, FTS_EXIST); + } + + | '~' { + $$ = fts_ast_create_node_oper(state, FTS_NEGATE); + } + + | '<' { + $$ = fts_ast_create_node_oper(state, FTS_DECR_RATING); + } + + | '>' { + $$ = fts_ast_create_node_oper(state, FTS_INCR_RATING); + } + ; + +term : FTS_TERM { + $$ = fts_ast_create_node_term(state, $1); + fts_ast_string_free($1); + } + + | FTS_NUMB { + $$ = fts_ast_create_node_term(state, $1); + fts_ast_string_free($1); + } + + /* Ignore leading '*' */ + | '*' term { + $$ = $2; + } + ; + +text : FTS_TEXT { + $$ = fts_ast_create_node_text(state, $1); + fts_ast_string_free($1); + } + ; +%% + +/******************************************************************** +*/ +int +ftserror( +/*=====*/ + const char* p) +{ + fprintf(stderr, "%s\n", p); + return(0); +} + +/******************************************************************** +Create a fts_lexer_t instance.*/ +fts_lexer_t* +fts_lexer_create( +/*=============*/ + ibool boolean_mode, + const byte* query, + ulint query_len) +{ + fts_lexer_t* fts_lexer = static_cast<fts_lexer_t*>( + ut_malloc_nokey(sizeof(fts_lexer_t))); + + if (boolean_mode) { + fts0blex_init(&fts_lexer->yyscanner); + fts0b_scan_bytes((char*) query, (int) query_len, fts_lexer->yyscanner); + fts_lexer->scanner = fts_blexer; + /* FIXME: Debugging */ + /* fts0bset_debug(1 , fts_lexer->yyscanner); */ + } else { + fts0tlex_init(&fts_lexer->yyscanner); + fts0t_scan_bytes((char*) query, (int) query_len, fts_lexer->yyscanner); + fts_lexer->scanner = fts_tlexer; + } + + return(fts_lexer); +} + +/******************************************************************** +Free an fts_lexer_t instance.*/ +void + +fts_lexer_free( +/*===========*/ + fts_lexer_t* fts_lexer) +{ + if (fts_lexer->scanner == fts_blexer) { + fts0blex_destroy(fts_lexer->yyscanner); + } else { + fts0tlex_destroy(fts_lexer->yyscanner); + } + + ut_free(fts_lexer); +} + +/******************************************************************** +Call the appropaiate scanner.*/ +int +fts_lexer( +/*======*/ + YYSTYPE* val, + fts_lexer_t* fts_lexer) +{ + fts_scanner func_ptr; + + func_ptr = fts_lexer->scanner; + + return(func_ptr(val, fts_lexer->yyscanner)); +} + +/******************************************************************** +Parse the query.*/ +int +fts_parse( +/*======*/ + fts_ast_state_t* state) +{ + return(ftsparse(state)); +} |