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/*-------------------------------------------------------------------------
*
* spell.h
*
* Declarations for ISpell dictionary
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
*
* src/include/tsearch/dicts/spell.h
*
*-------------------------------------------------------------------------
*/
#ifndef __SPELL_H__
#define __SPELL_H__
#include "regex/regex.h"
#include "tsearch/dicts/regis.h"
#include "tsearch/ts_public.h"
/*
* SPNode and SPNodeData are used to represent prefix tree (Trie) to store
* a words list.
*/
struct SPNode;
typedef struct
{
uint32 val:8,
isword:1,
/* Stores compound flags listed below */
compoundflag:4,
/* Reference to an entry of the AffixData field */
affix:19;
struct SPNode *node;
} SPNodeData;
/*
* Names of FF_ are correlated with Hunspell options in affix file
* http://hunspell.sourceforge.net/
*/
#define FF_COMPOUNDONLY 0x01
#define FF_COMPOUNDBEGIN 0x02
#define FF_COMPOUNDMIDDLE 0x04
#define FF_COMPOUNDLAST 0x08
#define FF_COMPOUNDFLAG ( FF_COMPOUNDBEGIN | FF_COMPOUNDMIDDLE | \
FF_COMPOUNDLAST )
#define FF_COMPOUNDFLAGMASK 0x0f
typedef struct SPNode
{
uint32 length;
SPNodeData data[FLEXIBLE_ARRAY_MEMBER];
} SPNode;
#define SPNHDRSZ (offsetof(SPNode,data))
/*
* Represents an entry in a words list.
*/
typedef struct spell_struct
{
union
{
/*
* flag is filled in by NIImportDictionary(). After
* NISortDictionary(), d is used instead of flag.
*/
char *flag;
/* d is used in mkSPNode() */
struct
{
/* Reference to an entry of the AffixData field */
int affix;
/* Length of the word */
int len;
} d;
} p;
char word[FLEXIBLE_ARRAY_MEMBER];
} SPELL;
#define SPELLHDRSZ (offsetof(SPELL, word))
/*
* If an affix uses a regex, we have to store that separately in a struct
* that won't move around when arrays of affixes are enlarged or sorted.
* This is so that it can be found to be cleaned up at context destruction.
*/
typedef struct aff_regex_struct
{
regex_t regex;
MemoryContextCallback mcallback;
} aff_regex_struct;
/*
* Represents an entry in an affix list.
*/
typedef struct aff_struct
{
char *flag;
/* FF_SUFFIX or FF_PREFIX */
uint32 type:1,
flagflags:7,
issimple:1,
isregis:1,
replen:14;
char *find;
char *repl;
union
{
aff_regex_struct *pregex;
Regis regis;
} reg;
} AFFIX;
/*
* affixes use dictionary flags too
*/
#define FF_COMPOUNDPERMITFLAG 0x10
#define FF_COMPOUNDFORBIDFLAG 0x20
#define FF_CROSSPRODUCT 0x40
/*
* Don't change the order of these. Initialization sorts by these,
* and expects prefixes to come first after sorting.
*/
#define FF_SUFFIX 1
#define FF_PREFIX 0
/*
* AffixNode and AffixNodeData are used to represent prefix tree (Trie) to store
* an affix list.
*/
struct AffixNode;
typedef struct
{
uint32 val:8,
naff:24;
AFFIX **aff;
struct AffixNode *node;
} AffixNodeData;
typedef struct AffixNode
{
uint32 isvoid:1,
length:31;
AffixNodeData data[FLEXIBLE_ARRAY_MEMBER];
} AffixNode;
#define ANHRDSZ (offsetof(AffixNode, data))
typedef struct
{
char *affix;
int len;
bool issuffix;
} CMPDAffix;
/*
* Type of encoding affix flags in Hunspell dictionaries
*/
typedef enum
{
FM_CHAR, /* one character (like ispell) */
FM_LONG, /* two characters */
FM_NUM /* number, >= 0 and < 65536 */
} FlagMode;
/*
* Structure to store Hunspell options. Flag representation depends on flag
* type. These flags are about support of compound words.
*/
typedef struct CompoundAffixFlag
{
union
{
/* Flag name if flagMode is FM_CHAR or FM_LONG */
char *s;
/* Flag name if flagMode is FM_NUM */
uint32 i;
} flag;
/* we don't have a bsearch_arg version, so, copy FlagMode */
FlagMode flagMode;
uint32 value;
} CompoundAffixFlag;
#define FLAGNUM_MAXSIZE (1 << 16)
typedef struct
{
int maffixes;
int naffixes;
AFFIX *Affix;
AffixNode *Suffix;
AffixNode *Prefix;
SPNode *Dictionary;
/* Array of sets of affixes */
char **AffixData;
int lenAffixData;
int nAffixData;
bool useFlagAliases;
CMPDAffix *CompoundAffix;
bool usecompound;
FlagMode flagMode;
/*
* All follow fields are actually needed only for initialization
*/
/* Array of Hunspell options in affix file */
CompoundAffixFlag *CompoundAffixFlags;
/* number of entries in CompoundAffixFlags array */
int nCompoundAffixFlag;
/* allocated length of CompoundAffixFlags array */
int mCompoundAffixFlag;
/*
* Remaining fields are only used during dictionary construction; they are
* set up by NIStartBuild and cleared by NIFinishBuild.
*/
MemoryContext buildCxt; /* temp context for construction */
/* Temporary array of all words in the dict file */
SPELL **Spell;
int nspell; /* number of valid entries in Spell array */
int mspell; /* allocated length of Spell array */
/* These are used to allocate "compact" data without palloc overhead */
char *firstfree; /* first free address (always maxaligned) */
size_t avail; /* free space remaining at firstfree */
} IspellDict;
extern TSLexeme *NINormalizeWord(IspellDict *Conf, char *word);
extern void NIStartBuild(IspellDict *Conf);
extern void NIImportAffixes(IspellDict *Conf, const char *filename);
extern void NIImportDictionary(IspellDict *Conf, const char *filename);
extern void NISortDictionary(IspellDict *Conf);
extern void NISortAffixes(IspellDict *Conf);
extern void NIFinishBuild(IspellDict *Conf);
#endif
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