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Edit File : plugin_ftparser.h \| Size : 7.65 KB
/* Copyright (c) 2005 MySQL AB, 2009 Sun Microsystems, Inc. Use is subject to license terms. 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 St, Fifth Floor, Boston, MA 02110-1335 USA / #ifndef _my_plugin_ftparser_h #define _my_plugin_ftparser_h #include "plugin.h" #ifdef __cplusplus extern "C" { #endif /************************************************************************ API for Full-text parser plugin. (MYSQL_FTPARSER_PLUGIN) / #define MYSQL_FTPARSER_INTERFACE_VERSION 0x0100 / Parsing modes. Set in MYSQL_FTPARSER_PARAM::mode / enum enum_ftparser_mode { / Fast and simple mode. This mode is used for indexing, and natural language queries. The parser is expected to return only those words that go into the index. Stopwords or too short/long words should not be returned. The 'boolean_info' argument of mysql_add_word() does not have to be set. / MYSQL_FTPARSER_SIMPLE_MODE= 0, / Parse with stopwords mode. This mode is used in boolean searches for "phrase matching." The parser is not allowed to ignore words in this mode. Every word should be returned, including stopwords and words that are too short or long. The 'boolean_info' argument of mysql_add_word() does not have to be set. / MYSQL_FTPARSER_WITH_STOPWORDS= 1, / Parse in boolean mode. This mode is used to parse a boolean query string. The parser should provide a valid MYSQL_FTPARSER_BOOLEAN_INFO structure in the 'boolean_info' argument to mysql_add_word(). Usually that means that the parser should recognize boolean operators in the parsing stream and set appropriate fields in MYSQL_FTPARSER_BOOLEAN_INFO structure accordingly. As for MYSQL_FTPARSER_WITH_STOPWORDS mode, no word should be ignored. Instead, use FT_TOKEN_STOPWORD for the token type of such a word. / MYSQL_FTPARSER_FULL_BOOLEAN_INFO= 2 }; / Token types for boolean mode searching (used for the type member of MYSQL_FTPARSER_BOOLEAN_INFO struct) FT_TOKEN_EOF: End of data. FT_TOKEN_WORD: Regular word. FT_TOKEN_LEFT_PAREN: Left parenthesis (start of group/sub-expression). FT_TOKEN_RIGHT_PAREN: Right parenthesis (end of group/sub-expression). FT_TOKEN_STOPWORD: Stopword. / enum enum_ft_token_type { FT_TOKEN_EOF= 0, FT_TOKEN_WORD= 1, FT_TOKEN_LEFT_PAREN= 2, FT_TOKEN_RIGHT_PAREN= 3, FT_TOKEN_STOPWORD= 4 }; / This structure is used in boolean search mode only. It conveys boolean-mode metadata to the MySQL search engine for every word in the search query. A valid instance of this structure must be filled in by the plugin parser and passed as an argument in the call to mysql_add_word (the callback function in the MYSQL_FTPARSER_PARAM structure) when a query is parsed in boolean mode. type: The token type. Should be one of the enum_ft_token_type values. yesno: Whether the word must be present for a match to occur: >0 Must be present <0 Must not be present 0 Neither; the word is optional but its presence increases the relevance With the default settings of the ft_boolean_syntax system variable, >0 corresponds to the '+' operator, <0 corresponds to the '-' operator, and 0 means neither operator was used. weight_adjust: A weighting factor that determines how much a match for the word counts. Positive values increase, negative - decrease the relative word's importance in the query. wasign: The sign of the word's weight in the query. If it's non-negative the match for the word will increase document relevance, if it's negative - decrease (the word becomes a "noise word", the less of it the better). trunc: Corresponds to the '' operator in the default setting of the ft_boolean_syntax system variable. / typedef struct st_mysql_ftparser_boolean_info { enum enum_ft_token_type type; int yesno; int weight_adjust; char wasign; char trunc; /* These are parser state and must be removed. / char prev; char quot; } MYSQL_FTPARSER_BOOLEAN_INFO; /* The following flag means that buffer with a string (document, word) may be overwritten by the caller before the end of the parsing (that is before st_mysql_ftparser::deinit() call). If one needs the string to survive between two successive calls of the parsing function, she needs to save a copy of it. The flag may be set by MySQL before calling st_mysql_ftparser::parse(), or it may be set by a plugin before calling st_mysql_ftparser_param::mysql_parse() or st_mysql_ftparser_param::mysql_add_word(). / #define MYSQL_FTFLAGS_NEED_COPY 1 / An argument of the full-text parser plugin. This structure is filled in by MySQL server and passed to the parsing function of the plugin as an in/out parameter. mysql_parse: A pointer to the built-in parser implementation of the server. It's set by the server and can be used by the parser plugin to invoke the MySQL default parser. If plugin's role is to extract textual data from .doc, .pdf or .xml content, it might extract plaintext from the content, and then pass the text to the default MySQL parser to be parsed. mysql_add_word: A server callback to add a new word. When parsing a document, the server sets this to point at a function that adds the word to MySQL full-text index. When parsing a search query, this function will add the new word to the list of words to search for. The boolean_info argument can be NULL for all cases except when mode is MYSQL_FTPARSER_FULL_BOOLEAN_INFO. A plugin can replace this callback to post-process every parsed word before passing it to the original mysql_add_word function. ftparser_state: A generic pointer. The plugin can set it to point to information to be used internally for its own purposes. mysql_ftparam: This is set by the server. It is used by MySQL functions called via mysql_parse() and mysql_add_word() callback. The plugin should not modify it. cs: Information about the character set of the document or query string. doc: A pointer to the document or query string to be parsed. length: Length of the document or query string, in bytes. flags: See MYSQL_FTFLAGS_* constants above. mode: The parsing mode. With boolean operators, with stopwords, or nothing. See enum_ftparser_mode above. / typedef struct st_mysql_ftparser_param { int (mysql_parse)(struct st_mysql_ftparser_param , const char doc, int doc_len); int (mysql_add_word)(struct st_mysql_ftparser_param , const char word, int word_len, MYSQL_FTPARSER_BOOLEAN_INFO boolean_info); void ftparser_state; void mysql_ftparam; const struct charset_info_st cs; const char doc; int length; unsigned int flags; enum enum_ftparser_mode mode; } MYSQL_FTPARSER_PARAM; /* Full-text parser descriptor. interface_version is, e.g., MYSQL_FTPARSER_INTERFACE_VERSION. The parsing, initialization, and deinitialization functions are invoked per SQL statement for which the parser is used. / struct st_mysql_ftparser { int interface_version; int (parse)(MYSQL_FTPARSER_PARAM param); int (init)(MYSQL_FTPARSER_PARAM param); int (deinit)(MYSQL_FTPARSER_PARAM *param); }; #ifdef __cplusplus } #endif #endif Back

Edit File : plugin_ftparser.h | Size : 7.65 KB

/* Copyright (c) 2005 MySQL AB, 2009 Sun Microsystems, Inc.
   Use is subject to license terms.

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 St, Fifth Floor, Boston, MA 02110-1335  USA */

#ifndef _my_plugin_ftparser_h
#define _my_plugin_ftparser_h
#include "plugin.h"

#ifdef __cplusplus
extern "C" {
#endif

/*************************************************************************
  API for Full-text parser plugin. (MYSQL_FTPARSER_PLUGIN)
*/

#define MYSQL_FTPARSER_INTERFACE_VERSION 0x0100

/* Parsing modes. Set in  MYSQL_FTPARSER_PARAM::mode */
enum enum_ftparser_mode
{
/*
  Fast and simple mode.  This mode is used for indexing, and natural
  language queries.

The parser is expected to return only those words that go into the
  index. Stopwords or too short/long words should not be returned. The
  'boolean_info' argument of mysql_add_word() does not have to be set.
*/
  MYSQL_FTPARSER_SIMPLE_MODE= 0,

/*
  Parse with stopwords mode.  This mode is used in boolean searches for
  "phrase matching."

The parser is not allowed to ignore words in this mode.  Every word
  should be returned, including stopwords and words that are too short
  or long.  The 'boolean_info' argument of mysql_add_word() does not
  have to be set.
*/
  MYSQL_FTPARSER_WITH_STOPWORDS= 1,

/*
  Parse in boolean mode.  This mode is used to parse a boolean query string.

The parser should provide a valid MYSQL_FTPARSER_BOOLEAN_INFO
  structure in the 'boolean_info' argument to mysql_add_word().
  Usually that means that the parser should recognize boolean operators
  in the parsing stream and set appropriate fields in
  MYSQL_FTPARSER_BOOLEAN_INFO structure accordingly.  As for
  MYSQL_FTPARSER_WITH_STOPWORDS mode, no word should be ignored.
  Instead, use FT_TOKEN_STOPWORD for the token type of such a word.
*/
  MYSQL_FTPARSER_FULL_BOOLEAN_INFO= 2
};

/*
  Token types for boolean mode searching (used for the type member of
  MYSQL_FTPARSER_BOOLEAN_INFO struct)

FT_TOKEN_EOF: End of data.
  FT_TOKEN_WORD: Regular word.
  FT_TOKEN_LEFT_PAREN: Left parenthesis (start of group/sub-expression).
  FT_TOKEN_RIGHT_PAREN: Right parenthesis (end of group/sub-expression).
  FT_TOKEN_STOPWORD: Stopword.
*/

enum enum_ft_token_type
{
  FT_TOKEN_EOF= 0,
  FT_TOKEN_WORD= 1,
  FT_TOKEN_LEFT_PAREN= 2,
  FT_TOKEN_RIGHT_PAREN= 3,
  FT_TOKEN_STOPWORD= 4
};

/*
  This structure is used in boolean search mode only. It conveys
  boolean-mode metadata to the MySQL search engine for every word in
  the search query. A valid instance of this structure must be filled
  in by the plugin parser and passed as an argument in the call to
  mysql_add_word (the callback function in the MYSQL_FTPARSER_PARAM
  structure) when a query is parsed in boolean mode.

type: The token type.  Should be one of the enum_ft_token_type values.

yesno: Whether the word must be present for a match to occur:
    >0 Must be present
    <0 Must not be present
    0  Neither; the word is optional but its presence increases the relevance
  With the default settings of the ft_boolean_syntax system variable,
  >0 corresponds to the '+' operator, <0 corresponds to the '-' operator,
  and 0 means neither operator was used.

weight_adjust: A weighting factor that determines how much a match
  for the word counts.  Positive values increase, negative - decrease the
  relative word's importance in the query.

wasign: The sign of the word's weight in the query. If it's non-negative
  the match for the word will increase document relevance, if it's
  negative - decrease (the word becomes a "noise word", the less of it the
  better).

trunc: Corresponds to the '*' operator in the default setting of the
  ft_boolean_syntax system variable.
*/

typedef struct st_mysql_ftparser_boolean_info
{
  enum enum_ft_token_type type;
  int yesno;
  int weight_adjust;
  char wasign;
  char trunc;
  /* These are parser state and must be removed. */
  char prev;
  char *quot;
} MYSQL_FTPARSER_BOOLEAN_INFO;

/*
  The following flag means that buffer with a string (document, word)
  may be overwritten by the caller before the end of the parsing (that is
  before st_mysql_ftparser::deinit() call). If one needs the string
  to survive between two successive calls of the parsing function, she
  needs to save a copy of it. The flag may be set by MySQL before calling
  st_mysql_ftparser::parse(), or it may be set by a plugin before calling
  st_mysql_ftparser_param::mysql_parse() or
  st_mysql_ftparser_param::mysql_add_word().
*/
#define MYSQL_FTFLAGS_NEED_COPY 1

/*
  An argument of the full-text parser plugin. This structure is
  filled in by MySQL server and passed to the parsing function of the
  plugin as an in/out parameter.

mysql_parse: A pointer to the built-in parser implementation of the
  server. It's set by the server and can be used by the parser plugin
  to invoke the MySQL default parser.  If plugin's role is to extract
  textual data from .doc, .pdf or .xml content, it might extract
  plaintext from the content, and then pass the text to the default
  MySQL parser to be parsed.

mysql_add_word: A server callback to add a new word.  When parsing
  a document, the server sets this to point at a function that adds
  the word to MySQL full-text index.  When parsing a search query,
  this function will add the new word to the list of words to search
  for.  The boolean_info argument can be NULL for all cases except
  when mode is MYSQL_FTPARSER_FULL_BOOLEAN_INFO. A plugin can replace this
  callback to post-process every parsed word before passing it to the original
  mysql_add_word function.

ftparser_state: A generic pointer. The plugin can set it to point
  to information to be used internally for its own purposes.

mysql_ftparam: This is set by the server.  It is used by MySQL functions
  called via mysql_parse() and mysql_add_word() callback.  The plugin
  should not modify it.

cs: Information about the character set of the document or query string.

doc: A pointer to the document or query string to be parsed.

length: Length of the document or query string, in bytes.

flags: See MYSQL_FTFLAGS_* constants above.

mode: The parsing mode.  With boolean operators, with stopwords, or
  nothing.  See  enum_ftparser_mode above.
*/

typedef struct st_mysql_ftparser_param
{
  int (*mysql_parse)(struct st_mysql_ftparser_param *,
                     const char *doc, int doc_len);
  int (*mysql_add_word)(struct st_mysql_ftparser_param *,
                        const char *word, int word_len,
                        MYSQL_FTPARSER_BOOLEAN_INFO *boolean_info);
  void *ftparser_state;
  void *mysql_ftparam;
  const struct charset_info_st *cs;
  const char *doc;
  int length;
  unsigned int flags;
  enum enum_ftparser_mode mode;
} MYSQL_FTPARSER_PARAM;

/*
  Full-text parser descriptor.

interface_version is, e.g., MYSQL_FTPARSER_INTERFACE_VERSION.
  The parsing, initialization, and deinitialization functions are
  invoked per SQL statement for which the parser is used.
*/

struct st_mysql_ftparser
{
  int interface_version;
  int (*parse)(MYSQL_FTPARSER_PARAM *param);
  int (*init)(MYSQL_FTPARSER_PARAM *param);
  int (*deinit)(MYSQL_FTPARSER_PARAM *param);
};

#ifdef __cplusplus
}
#endif

#endif

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