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Filename : spell.h
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/*-------------------------------------------------------------------------
 *
 * spell.h
 *
 * Declarations for ISpell dictionary
 *
 * Portions Copyright (c) 1996-2012, 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"

/*
 * Max length of a flag name. Names longer than this will be truncated
 * to the maximum.
 */
#define MAXFLAGLEN 16

struct SPNode;

typedef struct
{
	uint32		val:8,
				isword:1,
				compoundflag:4,
				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_DICTFLAGMASK		0x0f

typedef struct SPNode
{
	uint32		length;
	SPNodeData	data[1];
} SPNode;

#define SPNHDRSZ	(offsetof(SPNode,data))


typedef struct spell_struct
{
	union
	{
		/*
		 * flag is filled in by NIImportDictionary. After NISortDictionary, d
		 * is valid and flag is invalid.
		 */
		char		flag[MAXFLAGLEN];
		struct
		{
			int			affix;
			int			len;
		}			d;
	}			p;
	char		word[1];		/* variable length, null-terminated */
} SPELL;

#define SPELLHDRSZ	(offsetof(SPELL, word))

typedef struct aff_struct
{
	uint32		flag:8,
				type:1,
				flagflags:7,
				issimple:1,
				isregis:1,
				replen:14;
	char	   *find;
	char	   *repl;
	union
	{
		regex_t		regex;
		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

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[1];
} AffixNode;

#define ANHRDSZ		   (offsetof(AffixNode, data))

typedef struct
{
	char	   *affix;
	int			len;
	bool		issuffix;
} CMPDAffix;

typedef struct
{
	int			maffixes;
	int			naffixes;
	AFFIX	   *Affix;

	AffixNode  *Suffix;
	AffixNode  *Prefix;

	SPNode	   *Dictionary;
	char	  **AffixData;
	int			lenAffixData;
	int			nAffixData;

	CMPDAffix  *CompoundAffix;

	unsigned char flagval[256];
	bool		usecompound;

	/*
	 * 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