From 08119c361d1181b3e8f1abb429236e488a664753 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Tue, 13 Aug 2013 15:42:54 -0400 Subject: Imported Upstream version 2.2.1 --- src/test_spellfix.c | 2830 --------------------------------------------------- 1 file changed, 2830 deletions(-) delete mode 100644 src/test_spellfix.c (limited to 'src/test_spellfix.c') diff --git a/src/test_spellfix.c b/src/test_spellfix.c deleted file mode 100644 index 3f21d73..0000000 --- a/src/test_spellfix.c +++ /dev/null @@ -1,2830 +0,0 @@ -/* -** 2012 April 10 -** -** The author disclaims copyright to this source code. In place of -** a legal notice, here is a blessing: -** -** May you do good and not evil. -** May you find forgiveness for yourself and forgive others. -** May you share freely, never taking more than you give. -** -************************************************************************* -** -** This module implements the spellfix1 VIRTUAL TABLE that can be used -** to search a large vocabulary for close matches. See separate -** documentation files (spellfix1.wiki and editdist3.wiki) for details. -*/ -#if SQLITE_CORE -# include "sqliteInt.h" -#else -# include -# include -# include -# include "sqlite3ext.h" - SQLITE_EXTENSION_INIT1 -#endif /* !SQLITE_CORE */ -#include - -/* -** Character classes for ASCII characters: -** -** 0 '' Silent letters: H W -** 1 'A' Any vowel: A E I O U (Y) -** 2 'B' A bilabeal stop or fricative: B F P V W -** 3 'C' Other fricatives or back stops: C G J K Q S X Z -** 4 'D' Alveolar stops: D T -** 5 'H' Letter H at the beginning of a word -** 6 'L' Glide: L -** 7 'R' Semivowel: R -** 8 'M' Nasals: M N -** 9 'Y' Letter Y at the beginning of a word. -** 10 '9' Digits: 0 1 2 3 4 5 6 7 8 9 -** 11 ' ' White space -** 12 '?' Other. -*/ -#define CCLASS_SILENT 0 -#define CCLASS_VOWEL 1 -#define CCLASS_B 2 -#define CCLASS_C 3 -#define CCLASS_D 4 -#define CCLASS_H 5 -#define CCLASS_L 6 -#define CCLASS_R 7 -#define CCLASS_M 8 -#define CCLASS_Y 9 -#define CCLASS_DIGIT 10 -#define CCLASS_SPACE 11 -#define CCLASS_OTHER 12 - -/* -** The following table gives the character class for non-initial ASCII -** characters. -*/ -static const unsigned char midClass[] = { - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_SPACE, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_SPACE, /* */ CCLASS_SPACE, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_SPACE, - /* ! */ CCLASS_OTHER, /* " */ CCLASS_OTHER, /* # */ CCLASS_OTHER, - /* $ */ CCLASS_OTHER, /* % */ CCLASS_OTHER, /* & */ CCLASS_OTHER, - /* ' */ CCLASS_SILENT, /* ( */ CCLASS_OTHER, /* ) */ CCLASS_OTHER, - /* * */ CCLASS_OTHER, /* + */ CCLASS_OTHER, /* , */ CCLASS_OTHER, - /* - */ CCLASS_OTHER, /* . */ CCLASS_OTHER, /* / */ CCLASS_OTHER, - /* 0 */ CCLASS_DIGIT, /* 1 */ CCLASS_DIGIT, /* 2 */ CCLASS_DIGIT, - /* 3 */ CCLASS_DIGIT, /* 4 */ CCLASS_DIGIT, /* 5 */ CCLASS_DIGIT, - /* 6 */ CCLASS_DIGIT, /* 7 */ CCLASS_DIGIT, /* 8 */ CCLASS_DIGIT, - /* 9 */ CCLASS_DIGIT, /* : */ CCLASS_OTHER, /* ; */ CCLASS_OTHER, - /* < */ CCLASS_OTHER, /* = */ CCLASS_OTHER, /* > */ CCLASS_OTHER, - /* ? */ CCLASS_OTHER, /* @ */ CCLASS_OTHER, /* A */ CCLASS_VOWEL, - /* B */ CCLASS_B, /* C */ CCLASS_C, /* D */ CCLASS_D, - /* E */ CCLASS_VOWEL, /* F */ CCLASS_B, /* G */ CCLASS_C, - /* H */ CCLASS_SILENT, /* I */ CCLASS_VOWEL, /* J */ CCLASS_C, - /* K */ CCLASS_C, /* L */ CCLASS_L, /* M */ CCLASS_M, - /* N */ CCLASS_M, /* O */ CCLASS_VOWEL, /* P */ CCLASS_B, - /* Q */ CCLASS_C, /* R */ CCLASS_R, /* S */ CCLASS_C, - /* T */ CCLASS_D, /* U */ CCLASS_VOWEL, /* V */ CCLASS_B, - /* W */ CCLASS_B, /* X */ CCLASS_C, /* Y */ CCLASS_VOWEL, - /* Z */ CCLASS_C, /* [ */ CCLASS_OTHER, /* \ */ CCLASS_OTHER, - /* ] */ CCLASS_OTHER, /* ^ */ CCLASS_OTHER, /* _ */ CCLASS_OTHER, - /* ` */ CCLASS_OTHER, /* a */ CCLASS_VOWEL, /* b */ CCLASS_B, - /* c */ CCLASS_C, /* d */ CCLASS_D, /* e */ CCLASS_VOWEL, - /* f */ CCLASS_B, /* g */ CCLASS_C, /* h */ CCLASS_SILENT, - /* i */ CCLASS_VOWEL, /* j */ CCLASS_C, /* k */ CCLASS_C, - /* l */ CCLASS_L, /* m */ CCLASS_M, /* n */ CCLASS_M, - /* o */ CCLASS_VOWEL, /* p */ CCLASS_B, /* q */ CCLASS_C, - /* r */ CCLASS_R, /* s */ CCLASS_C, /* t */ CCLASS_D, - /* u */ CCLASS_VOWEL, /* v */ CCLASS_B, /* w */ CCLASS_B, - /* x */ CCLASS_C, /* y */ CCLASS_VOWEL, /* z */ CCLASS_C, - /* { */ CCLASS_OTHER, /* | */ CCLASS_OTHER, /* } */ CCLASS_OTHER, - /* ~ */ CCLASS_OTHER, /* */ CCLASS_OTHER, -}; -/* -** This tables gives the character class for ASCII characters that form the -** initial character of a word. The only difference from midClass is with -** the letters H, W, and Y. -*/ -static const unsigned char initClass[] = { - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_SPACE, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_SPACE, /* */ CCLASS_SPACE, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, - /* */ CCLASS_OTHER, /* */ CCLASS_OTHER, /* */ CCLASS_SPACE, - /* ! */ CCLASS_OTHER, /* " */ CCLASS_OTHER, /* # */ CCLASS_OTHER, - /* $ */ CCLASS_OTHER, /* % */ CCLASS_OTHER, /* & */ CCLASS_OTHER, - /* ' */ CCLASS_OTHER, /* ( */ CCLASS_OTHER, /* ) */ CCLASS_OTHER, - /* * */ CCLASS_OTHER, /* + */ CCLASS_OTHER, /* , */ CCLASS_OTHER, - /* - */ CCLASS_OTHER, /* . */ CCLASS_OTHER, /* / */ CCLASS_OTHER, - /* 0 */ CCLASS_DIGIT, /* 1 */ CCLASS_DIGIT, /* 2 */ CCLASS_DIGIT, - /* 3 */ CCLASS_DIGIT, /* 4 */ CCLASS_DIGIT, /* 5 */ CCLASS_DIGIT, - /* 6 */ CCLASS_DIGIT, /* 7 */ CCLASS_DIGIT, /* 8 */ CCLASS_DIGIT, - /* 9 */ CCLASS_DIGIT, /* : */ CCLASS_OTHER, /* ; */ CCLASS_OTHER, - /* < */ CCLASS_OTHER, /* = */ CCLASS_OTHER, /* > */ CCLASS_OTHER, - /* ? */ CCLASS_OTHER, /* @ */ CCLASS_OTHER, /* A */ CCLASS_VOWEL, - /* B */ CCLASS_B, /* C */ CCLASS_C, /* D */ CCLASS_D, - /* E */ CCLASS_VOWEL, /* F */ CCLASS_B, /* G */ CCLASS_C, - /* H */ CCLASS_SILENT, /* I */ CCLASS_VOWEL, /* J */ CCLASS_C, - /* K */ CCLASS_C, /* L */ CCLASS_L, /* M */ CCLASS_M, - /* N */ CCLASS_M, /* O */ CCLASS_VOWEL, /* P */ CCLASS_B, - /* Q */ CCLASS_C, /* R */ CCLASS_R, /* S */ CCLASS_C, - /* T */ CCLASS_D, /* U */ CCLASS_VOWEL, /* V */ CCLASS_B, - /* W */ CCLASS_B, /* X */ CCLASS_C, /* Y */ CCLASS_Y, - /* Z */ CCLASS_C, /* [ */ CCLASS_OTHER, /* \ */ CCLASS_OTHER, - /* ] */ CCLASS_OTHER, /* ^ */ CCLASS_OTHER, /* _ */ CCLASS_OTHER, - /* ` */ CCLASS_OTHER, /* a */ CCLASS_VOWEL, /* b */ CCLASS_B, - /* c */ CCLASS_C, /* d */ CCLASS_D, /* e */ CCLASS_VOWEL, - /* f */ CCLASS_B, /* g */ CCLASS_C, /* h */ CCLASS_SILENT, - /* i */ CCLASS_VOWEL, /* j */ CCLASS_C, /* k */ CCLASS_C, - /* l */ CCLASS_L, /* m */ CCLASS_M, /* n */ CCLASS_M, - /* o */ CCLASS_VOWEL, /* p */ CCLASS_B, /* q */ CCLASS_C, - /* r */ CCLASS_R, /* s */ CCLASS_C, /* t */ CCLASS_D, - /* u */ CCLASS_VOWEL, /* v */ CCLASS_B, /* w */ CCLASS_B, - /* x */ CCLASS_C, /* y */ CCLASS_Y, /* z */ CCLASS_C, - /* { */ CCLASS_OTHER, /* | */ CCLASS_OTHER, /* } */ CCLASS_OTHER, - /* ~ */ CCLASS_OTHER, /* */ CCLASS_OTHER, -}; - -/* -** Mapping from the character class number (0-13) to a symbol for each -** character class. Note that initClass[] can be used to map the class -** symbol back into the class number. -*/ -static const unsigned char className[] = ".ABCDHLRMY9 ?"; - -/* -** Generate a "phonetic hash" from a string of ASCII characters -** in zIn[0..nIn-1]. -** -** * Map characters by character class as defined above. -** * Omit double-letters -** * Omit vowels beside R and L -** * Omit T when followed by CH -** * Omit W when followed by R -** * Omit D when followed by J or G -** * Omit K in KN or G in GN at the beginning of a word -** -** Space to hold the result is obtained from sqlite3_malloc() -** -** Return NULL if memory allocation fails. -*/ -static unsigned char *phoneticHash(const unsigned char *zIn, int nIn){ - unsigned char *zOut = sqlite3_malloc( nIn + 1 ); - int i; - int nOut = 0; - char cPrev = 0x77; - char cPrevX = 0x77; - const unsigned char *aClass = initClass; - - if( zOut==0 ) return 0; - if( nIn>2 ){ - switch( zIn[0] ){ - case 'g': - case 'k': { - if( zIn[1]=='n' ){ zIn++; nIn--; } - break; - } - } - } - for(i=0; i=0 ); - if( nOut==0 || c!=zOut[nOut-1] ) zOut[nOut++] = c; - } - zOut[nOut] = 0; - return zOut; -} - -/* -** This is an SQL function wrapper around phoneticHash(). See -** the description of phoneticHash() for additional information. -*/ -static void phoneticHashSqlFunc( - sqlite3_context *context, - int argc, - sqlite3_value **argv -){ - const unsigned char *zIn; - unsigned char *zOut; - - zIn = sqlite3_value_text(argv[0]); - if( zIn==0 ) return; - zOut = phoneticHash(zIn, sqlite3_value_bytes(argv[0])); - if( zOut==0 ){ - sqlite3_result_error_nomem(context); - }else{ - sqlite3_result_text(context, (char*)zOut, -1, sqlite3_free); - } -} - -/* -** Return the character class number for a character given its -** context. -*/ -static char characterClass(char cPrev, char c){ - return cPrev==0 ? initClass[c&0x7f] : midClass[c&0x7f]; -} - -/* -** Return the cost of inserting or deleting character c immediately -** following character cPrev. If cPrev==0, that means c is the first -** character of the word. -*/ -static int insertOrDeleteCost(char cPrev, char c, char cNext){ - char classC = characterClass(cPrev, c); - char classCprev; - - if( classC==CCLASS_SILENT ){ - /* Insert or delete "silent" characters such as H or W */ - return 1; - } - if( cPrev==c ){ - /* Repeated characters, or miss a repeat */ - return 10; - } - if( classC==CCLASS_VOWEL && (cPrev=='r' || cNext=='r') ){ - return 20; /* Insert a vowel before or after 'r' */ - } - classCprev = characterClass(cPrev, cPrev); - if( classC==classCprev ){ - if( classC==CCLASS_VOWEL ){ - /* Remove or add a new vowel to a vowel cluster */ - return 15; - }else{ - /* Remove or add a consonant not in the same class */ - return 50; - } - } - - /* any other character insertion or deletion */ - return 100; -} - -/* -** Divide the insertion cost by this factor when appending to the -** end of the word. -*/ -#define FINAL_INS_COST_DIV 4 - -/* -** Return the cost of substituting cTo in place of cFrom assuming -** the previous character is cPrev. If cPrev==0 then cTo is the first -** character of the word. -*/ -static int substituteCost(char cPrev, char cFrom, char cTo){ - char classFrom, classTo; - if( cFrom==cTo ){ - /* Exact match */ - return 0; - } - if( cFrom==(cTo^0x20) && ((cTo>='A' && cTo<='Z') || (cTo>='a' && cTo<='z')) ){ - /* differ only in case */ - return 0; - } - classFrom = characterClass(cPrev, cFrom); - classTo = characterClass(cPrev, cTo); - if( classFrom==classTo ){ - /* Same character class */ - return 40; - } - if( classFrom>=CCLASS_B && classFrom<=CCLASS_Y - && classTo>=CCLASS_B && classTo<=CCLASS_Y ){ - /* Convert from one consonant to another, but in a different class */ - return 75; - } - /* Any other subsitution */ - return 100; -} - -/* -** Given two strings zA and zB which are pure ASCII, return the cost -** of transforming zA into zB. If zA ends with '*' assume that it is -** a prefix of zB and give only minimal penalty for extra characters -** on the end of zB. -** -** Smaller numbers mean a closer match. -** -** Negative values indicate an error: -** -1 One of the inputs is NULL -** -2 Non-ASCII characters on input -** -3 Unable to allocate memory -** -** If pnMatch is not NULL, then *pnMatch is set to the number of bytes -** of zB that matched the pattern in zA. If zA does not end with a '*', -** then this value is always the number of bytes in zB (i.e. strlen(zB)). -** If zA does end in a '*', then it is the number of bytes in the prefix -** of zB that was deemed to match zA. -*/ -static int editdist1(const char *zA, const char *zB, int *pnMatch){ - int nA, nB; /* Number of characters in zA[] and zB[] */ - int xA, xB; /* Loop counters for zA[] and zB[] */ - char cA, cB; /* Current character of zA and zB */ - char cAprev, cBprev; /* Previous character of zA and zB */ - char cAnext, cBnext; /* Next character in zA and zB */ - int d; /* North-west cost value */ - int dc = 0; /* North-west character value */ - int res; /* Final result */ - int *m; /* The cost matrix */ - char *cx; /* Corresponding character values */ - int *toFree = 0; /* Malloced space */ - int mStack[60+15]; /* Stack space to use if not too much is needed */ - int nMatch = 0; - - /* Early out if either input is NULL */ - if( zA==0 || zB==0 ) return -1; - - /* Skip any common prefix */ - while( zA[0] && zA[0]==zB[0] ){ dc = zA[0]; zA++; zB++; nMatch++; } - if( pnMatch ) *pnMatch = nMatch; - if( zA[0]==0 && zB[0]==0 ) return 0; - -#if 0 - printf("A=\"%s\" B=\"%s\" dc=%c\n", zA, zB, dc?dc:' '); -#endif - - /* Verify input strings and measure their lengths */ - for(nA=0; zA[nA]; nA++){ - if( zA[nA]&0x80 ) return -2; - } - for(nB=0; zB[nB]; nB++){ - if( zB[nB]&0x80 ) return -2; - } - - /* Special processing if either string is empty */ - if( nA==0 ){ - cBprev = dc; - for(xB=res=0; (cB = zB[xB])!=0; xB++){ - res += insertOrDeleteCost(cBprev, cB, zB[xB+1])/FINAL_INS_COST_DIV; - cBprev = cB; - } - return res; - } - if( nB==0 ){ - cAprev = dc; - for(xA=res=0; (cA = zA[xA])!=0; xA++){ - res += insertOrDeleteCost(cAprev, cA, zA[xA+1]); - cAprev = cA; - } - return res; - } - - /* A is a prefix of B */ - if( zA[0]=='*' && zA[1]==0 ) return 0; - - /* Allocate and initialize the Wagner matrix */ - if( nB<(sizeof(mStack)*4)/(sizeof(mStack[0])*5) ){ - m = mStack; - }else{ - m = toFree = sqlite3_malloc( (nB+1)*5*sizeof(m[0])/4 ); - if( m==0 ) return -3; - } - cx = (char*)&m[nB+1]; - - /* Compute the Wagner edit distance */ - m[0] = 0; - cx[0] = dc; - cBprev = dc; - for(xB=1; xB<=nB; xB++){ - cBnext = zB[xB]; - cB = zB[xB-1]; - cx[xB] = cB; - m[xB] = m[xB-1] + insertOrDeleteCost(cBprev, cB, cBnext); - cBprev = cB; - } - cAprev = dc; - for(xA=1; xA<=nA; xA++){ - int lastA = (xA==nA); - cA = zA[xA-1]; - cAnext = zA[xA]; - if( cA=='*' && lastA ) break; - d = m[0]; - dc = cx[0]; - m[0] = d + insertOrDeleteCost(cAprev, cA, cAnext); - cBprev = 0; - for(xB=1; xB<=nB; xB++){ - int totalCost, insCost, delCost, subCost, ncx; - cB = zB[xB-1]; - cBnext = zB[xB]; - - /* Cost to insert cB */ - insCost = insertOrDeleteCost(cx[xB-1], cB, cBnext); - if( lastA ) insCost /= FINAL_INS_COST_DIV; - - /* Cost to delete cA */ - delCost = insertOrDeleteCost(cx[xB], cA, cBnext); - - /* Cost to substitute cA->cB */ - subCost = substituteCost(cx[xB-1], cA, cB); - - /* Best cost */ - totalCost = insCost + m[xB-1]; - ncx = cB; - if( (delCost + m[xB])nLang; i++){ - EditDist3Cost *pCost, *pNext; - pCost = p->a[i].pCost; - while( pCost ){ - pNext = pCost->pNext; - sqlite3_free(pCost); - pCost = pNext; - } - } - sqlite3_free(p->a); - memset(p, 0, sizeof(*p)); -} -static void editDist3ConfigDelete(void *pIn){ - EditDist3Config *p = (EditDist3Config*)pIn; - editDist3ConfigClear(p); - sqlite3_free(p); -} - -/* -** Load all edit-distance weights from a table. -*/ -static int editDist3ConfigLoad( - EditDist3Config *p, /* The edit distance configuration to load */ - sqlite3 *db, /* Load from this database */ - const char *zTable /* Name of the table from which to load */ -){ - sqlite3_stmt *pStmt; - int rc, rc2; - char *zSql; - int iLangPrev = -9999; - EditDist3Lang *pLang = 0; - - zSql = sqlite3_mprintf("SELECT iLang, cFrom, cTo, iCost" - " FROM \"%w\" WHERE iLang>=0 ORDER BY iLang", zTable); - if( zSql==0 ) return SQLITE_NOMEM; - rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0); - sqlite3_free(zSql); - if( rc ) return rc; - editDist3ConfigClear(p); - while( sqlite3_step(pStmt)==SQLITE_ROW ){ - int iLang = sqlite3_column_int(pStmt, 0); - const char *zFrom = (const char*)sqlite3_column_text(pStmt, 1); - int nFrom = zFrom ? sqlite3_column_bytes(pStmt, 1) : 0; - const char *zTo = (const char*)sqlite3_column_text(pStmt, 2); - int nTo = zTo ? sqlite3_column_bytes(pStmt, 2) : 0; - int iCost = sqlite3_column_int(pStmt, 3); - - assert( zFrom!=0 || nFrom==0 ); - assert( zTo!=0 || nTo==0 ); - if( nFrom>100 || nTo>100 ) continue; - if( iCost<0 ) continue; - if( pLang==0 || iLang!=iLangPrev ){ - EditDist3Lang *pNew; - pNew = sqlite3_realloc(p->a, (p->nLang+1)*sizeof(p->a[0])); - if( pNew==0 ){ rc = SQLITE_NOMEM; break; } - p->a = pNew; - pLang = &p->a[p->nLang]; - p->nLang++; - pLang->iLang = iLang; - pLang->iInsCost = 100; - pLang->iDelCost = 100; - pLang->iSubCost = 150; - pLang->pCost = 0; - iLangPrev = iLang; - } - if( nFrom==1 && zFrom[0]=='?' && nTo==0 ){ - pLang->iDelCost = iCost; - }else if( nFrom==0 && nTo==1 && zTo[0]=='?' ){ - pLang->iInsCost = iCost; - }else if( nFrom==1 && nTo==1 && zFrom[0]=='?' && zTo[0]=='?' ){ - pLang->iSubCost = iCost; - }else{ - EditDist3Cost *pCost; - int nExtra = nFrom + nTo - 4; - if( nExtra<0 ) nExtra = 0; - pCost = sqlite3_malloc( sizeof(*pCost) + nExtra ); - if( pCost==0 ){ rc = SQLITE_NOMEM; break; } - pCost->nFrom = nFrom; - pCost->nTo = nTo; - pCost->iCost = iCost; - memcpy(pCost->a, zFrom, nFrom); - memcpy(pCost->a + nFrom, zTo, nTo); - pCost->pNext = pLang->pCost; - pLang->pCost = pCost; - } - } - rc2 = sqlite3_finalize(pStmt); - if( rc==SQLITE_OK ) rc = rc2; - return rc; -} - -/* -** Return the length (in bytes) of a utf-8 character. Or return a maximum -** of N. -*/ -static int utf8Len(unsigned char c, int N){ - int len = 1; - if( c>0x7f ){ - if( (c&0xe0)==0xc0 ){ - len = 2; - }else if( (c&0xf0)==0xe0 ){ - len = 3; - }else{ - len = 4; - } - } - if( len>N ) len = N; - return len; -} - -/* -** Return TRUE (non-zero) of the To side of the given cost matches -** the given string. -*/ -static int matchTo(EditDist3Cost *p, const char *z, int n){ - if( p->nTo>n ) return 0; - if( memcmp(p->a+p->nFrom, z, p->nTo)!=0 ) return 0; - return 1; -} - -/* -** Return TRUE (non-zero) of the To side of the given cost matches -** the given string. -*/ -static int matchFrom(EditDist3Cost *p, const char *z, int n){ - assert( p->nFrom<=n ); - if( memcmp(p->a, z, p->nFrom)!=0 ) return 0; - return 1; -} - -/* -** Return TRUE (non-zero) of the next FROM character and the next TO -** character are the same. -*/ -static int matchFromTo( - EditDist3FromString *pStr, /* Left hand string */ - int n1, /* Index of comparison character on the left */ - const char *z2, /* Right-handl comparison character */ - int n2 /* Bytes remaining in z2[] */ -){ - int b1 = pStr->a[n1].nByte; - if( b1>n2 ) return 0; - if( memcmp(pStr->z+n1, z2, b1)!=0 ) return 0; - return 1; -} - -/* -** Delete an EditDist3FromString objecct -*/ -static void editDist3FromStringDelete(EditDist3FromString *p){ - int i; - if( p ){ - for(i=0; in; i++){ - sqlite3_free(p->a[i].apDel); - sqlite3_free(p->a[i].apSubst); - } - sqlite3_free(p); - } -} - -/* -** Create a EditDist3FromString object. -*/ -static EditDist3FromString *editDist3FromStringNew( - const EditDist3Lang *pLang, - const char *z, - int n -){ - EditDist3FromString *pStr; - EditDist3Cost *p; - int i; - - if( z==0 ) return 0; - if( n<0 ) n = (int)strlen(z); - pStr = sqlite3_malloc( sizeof(*pStr) + sizeof(pStr->a[0])*n + n + 1 ); - if( pStr==0 ) return 0; - pStr->a = (EditDist3From*)&pStr[1]; - memset(pStr->a, 0, sizeof(pStr->a[0])*n); - pStr->n = n; - pStr->z = (char*)&pStr->a[n]; - memcpy(pStr->z, z, n+1); - if( n && z[n-1]=='*' ){ - pStr->isPrefix = 1; - n--; - pStr->n--; - pStr->z[n] = 0; - }else{ - pStr->isPrefix = 0; - } - - for(i=0; ia[i]; - memset(pFrom, 0, sizeof(*pFrom)); - pFrom->nByte = utf8Len((unsigned char)z[i], n-i); - for(p=pLang->pCost; p; p=p->pNext){ - EditDist3Cost **apNew; - if( i+p->nFrom>n ) continue; - if( matchFrom(p, z+i, n-i)==0 ) continue; - if( p->nTo==0 ){ - apNew = sqlite3_realloc(pFrom->apDel, - sizeof(*apNew)*(pFrom->nDel+1)); - if( apNew==0 ) break; - pFrom->apDel = apNew; - apNew[pFrom->nDel++] = p; - }else{ - apNew = sqlite3_realloc(pFrom->apSubst, - sizeof(*apNew)*(pFrom->nSubst+1)); - if( apNew==0 ) break; - pFrom->apSubst = apNew; - apNew[pFrom->nSubst++] = p; - } - } - if( p ){ - editDist3FromStringDelete(pStr); - pStr = 0; - break; - } - } - return pStr; -} - -/* -** Update entry m[i] such that it is the minimum of its current value -** and m[j]+iCost. -** -** If the iCost is 1,000,000 or greater, then consider the cost to be -** infinite and skip the update. -*/ -static void updateCost( - unsigned int *m, - int i, - int j, - int iCost -){ - assert( iCost>=0 ); - if( iCost<10000 ){ - unsigned int b = m[j] + iCost; - if( bpCost; p; p=p->pNext){ - EditDist3Cost **apNew; - if( p->nFrom>0 ) continue; - if( i2+p->nTo>n2 ) continue; - if( matchTo(p, z2+i2, n2-i2)==0 ) continue; - a2[i2].nIns++; - apNew = sqlite3_realloc(a2[i2].apIns, sizeof(*apNew)*a2[i2].nIns); - if( apNew==0 ){ - res = -1; /* Out of memory */ - goto editDist3Abort; - } - a2[i2].apIns = apNew; - a2[i2].apIns[a2[i2].nIns-1] = p; - } - } - - /* Prepare to compute the minimum edit distance */ - szRow = f.n+1; - memset(m, 0x01, (n2+1)*szRow*sizeof(m[0])); - m[0] = 0; - - /* First fill in the top-row of the matrix with FROM deletion costs */ - for(i1=0; i1iDelCost); - for(k=0; knFrom, i1, p->iCost); - } - } - - /* Fill in all subsequent rows, top-to-bottom, left-to-right */ - for(i2=0; i2iInsCost); - for(k=0; knTo), rxp, p->iCost); - } - for(i1=0; i1iDelCost); - for(k=0; knFrom, cxp, p->iCost); - } - updateCost(m, cx, cxu, pLang->iInsCost); - if( matchFromTo(&f, i1, z2+i2, n2-i2) ){ - updateCost(m, cx, cxd, 0); - } - updateCost(m, cx, cxd, pLang->iSubCost); - for(k=0; knFrom+szRow*p->nTo, cxd, p->iCost); - } - } - } - } - -#if 0 /* Enable for debugging */ - printf(" ^"); - for(i1=0; i19999 ) printf(" ****"); - else printf(" %4d", v); - } - printf("\n"); - for(i2=0; i29999 ) printf(" ****"); - else printf(" %4d", v); - } - printf("\n"); - } -#endif - - /* Free memory allocations and return the result */ - res = (int)m[szRow*(n2+1)-1]; - n = n2; - if( f.isPrefix ){ - for(i2=1; i2<=n2; i2++){ - int b = m[szRow*i2-1]; - if( b<=res ){ - res = b; - n = i2 - 1; - } - } - } - if( pnMatch ){ - int nExtra = 0; - for(k=0; knLang; i++){ - if( pConfig->a[i].iLang==iLang ) return &pConfig->a[i]; - } - return &editDist3Lang; -} - -/* -** Function: editdist3(A,B,iLang) -** editdist3(tablename) -** -** Return the cost of transforming string A into string B using edit -** weights for iLang. -** -** The second form loads edit weights into memory from a table. -*/ -static void editDist3SqlFunc( - sqlite3_context *context, - int argc, - sqlite3_value **argv -){ - EditDist3Config *pConfig = (EditDist3Config*)sqlite3_user_data(context); - sqlite3 *db = sqlite3_context_db_handle(context); - int rc; - if( argc==1 ){ - const char *zTable = (const char*)sqlite3_value_text(argv[0]); - rc = editDist3ConfigLoad(pConfig, db, zTable); - if( rc ) sqlite3_result_error_code(context, rc); - }else{ - const char *zA = (const char*)sqlite3_value_text(argv[0]); - const char *zB = (const char*)sqlite3_value_text(argv[1]); - int nA = sqlite3_value_bytes(argv[0]); - int nB = sqlite3_value_bytes(argv[1]); - int iLang = argc==3 ? sqlite3_value_int(argv[2]) : 0; - const EditDist3Lang *pLang = editDist3FindLang(pConfig, iLang); - EditDist3FromString *pFrom; - int dist; - - pFrom = editDist3FromStringNew(pLang, zA, nA); - if( pFrom==0 ){ - sqlite3_result_error_nomem(context); - return; - } - dist = editDist3Core(pFrom, zB, nB, pLang, 0); - editDist3FromStringDelete(pFrom); - if( dist==(-1) ){ - sqlite3_result_error_nomem(context); - }else{ - sqlite3_result_int(context, dist); - } - } -} - -/* -** Register the editDist3 function with SQLite -*/ -static int editDist3Install(sqlite3 *db){ - int rc; - EditDist3Config *pConfig = sqlite3_malloc( sizeof(*pConfig) ); - if( pConfig==0 ) return SQLITE_NOMEM; - memset(pConfig, 0, sizeof(*pConfig)); - rc = sqlite3_create_function_v2(db, "editdist3", - 2, SQLITE_UTF8, pConfig, editDist3SqlFunc, 0, 0, 0); - if( rc==SQLITE_OK ){ - rc = sqlite3_create_function_v2(db, "editdist3", - 3, SQLITE_UTF8, pConfig, editDist3SqlFunc, 0, 0, 0); - } - if( rc==SQLITE_OK ){ - rc = sqlite3_create_function_v2(db, "editdist3", - 1, SQLITE_UTF8, pConfig, editDist3SqlFunc, 0, 0, - editDist3ConfigDelete); - }else{ - sqlite3_free(pConfig); - } - return rc; -} -/* End configurable cost unicode edit distance routines -****************************************************************************** -****************************************************************************** -** Begin transliterate unicode-to-ascii implementation -*/ - -#if !SQLITE_AMALGAMATION -/* -** This lookup table is used to help decode the first byte of -** a multi-byte UTF8 character. -*/ -static const unsigned char sqlite3Utf8Trans1[] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, - 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x00, 0x01, 0x02, 0x03, 0x00, 0x01, 0x00, 0x00, -}; -#endif - -/* -** Return the value of the first UTF-8 character in the string. -*/ -static int utf8Read(const unsigned char *z, int n, int *pSize){ - int c, i; - - /* All callers to this routine (in the current implementation) - ** always have n>0. */ - if( NEVER(n==0) ){ - c = i = 0; - }else{ - c = z[0]; - i = 1; - if( c>=0xc0 ){ - c = sqlite3Utf8Trans1[c-0xc0]; - while( i0 ){ - c = utf8Read(zIn, nIn, &sz); - zIn += sz; - nIn -= sz; - if( c<=127 ){ - zOut[nOut++] = c; - }else{ - int xTop, xBtm, x; - xTop = sizeof(translit)/sizeof(translit[0]) - 1; - xBtm = 0; - while( xTop>=xBtm ){ - x = (xTop + xBtm)/2; - if( translit[x].cFrom==c ){ - zOut[nOut++] = translit[x].cTo0; - if( translit[x].cTo1 ){ - zOut[nOut++] = translit[x].cTo1; - /* Add an extra "ch" after the "sh" for Щ and щ */ - if( c==0x0429 || c== 0x0449 ){ - zOut[nOut++] = 'c'; - zOut[nOut++] = 'h'; - } - } - c = 0; - break; - }else if( translit[x].cFrom>c ){ - xTop = x-1; - }else{ - xBtm = x+1; - } - } - if( c ) zOut[nOut++] = '?'; - } - } - zOut[nOut] = 0; - return zOut; -} - -/* -** Return the number of characters in the shortest prefix of the input -** string that transliterates to an ASCII string nTrans bytes or longer. -** Or, if the transliteration of the input string is less than nTrans -** bytes in size, return the number of characters in the input string. -*/ -static int translen_to_charlen(const char *zIn, int nIn, int nTrans){ - int i, c, sz, nOut; - int nChar; - - i = nOut = 0; - for(nChar=0; i=128 ){ - int xTop, xBtm, x; - xTop = sizeof(translit)/sizeof(translit[0]) - 1; - xBtm = 0; - while( xTop>=xBtm ){ - x = (xTop + xBtm)/2; - if( translit[x].cFrom==c ){ - if( translit[x].cTo1 ) nOut++; - if( c==0x0429 || c== 0x0449 ) nOut += 2; - break; - }else if( translit[x].cFrom>c ){ - xTop = x-1; - }else{ - xBtm = x+1; - } - } - } - } - - return nChar; -} - - -/* -** spellfix1_translit(X) -** -** Convert a string that contains non-ASCII Roman characters into -** pure ASCII. -*/ -static void transliterateSqlFunc( - sqlite3_context *context, - int argc, - sqlite3_value **argv -){ - const unsigned char *zIn = sqlite3_value_text(argv[0]); - int nIn = sqlite3_value_bytes(argv[0]); - unsigned char *zOut = transliterate(zIn, nIn); - if( zOut==0 ){ - sqlite3_result_error_nomem(context); - }else{ - sqlite3_result_text(context, (char*)zOut, -1, sqlite3_free); - } -} - -/* -** spellfix1_scriptcode(X) -** -** Try to determine the dominant script used by the word X and return -** its ISO 15924 numeric code. -** -** The current implementation only understands the following scripts: -** -** 215 (Latin) -** 220 (Cyrillic) -** 200 (Greek) -** -** This routine will return 998 if the input X contains characters from -** two or more of the above scripts or 999 if X contains no characters -** from any of the above scripts. -*/ -static void scriptCodeSqlFunc( - sqlite3_context *context, - int argc, - sqlite3_value **argv -){ - const unsigned char *zIn = sqlite3_value_text(argv[0]); - int nIn = sqlite3_value_bytes(argv[0]); - int c, sz; - int scriptMask = 0; - int res; -# define SCRIPT_LATIN 0x0001 -# define SCRIPT_CYRILLIC 0x0002 -# define SCRIPT_GREEK 0x0004 - - while( nIn>0 ){ - c = utf8Read(zIn, nIn, &sz); - zIn += sz; - nIn -= sz; - if( c<0x02af ){ - scriptMask |= SCRIPT_LATIN; - }else if( c>=0x0400 && c<=0x04ff ){ - scriptMask |= SCRIPT_CYRILLIC; - }else if( c>=0x0386 && c<=0x03ce ){ - scriptMask |= SCRIPT_GREEK; - } - } - switch( scriptMask ){ - case 0: res = 999; break; - case SCRIPT_LATIN: res = 215; break; - case SCRIPT_CYRILLIC: res = 220; break; - case SCRIPT_GREEK: res = 200; break; - default: res = 998; break; - } - sqlite3_result_int(context, res); -} - -/* End transliterate -****************************************************************************** -****************************************************************************** -** Begin spellfix1 virtual table. -*/ - -/* Maximum length of a phonehash used for querying the shadow table */ -#define SPELLFIX_MX_HASH 8 - -/* Maximum number of hash strings to examine per query */ -#define SPELLFIX_MX_RUN 1 - -typedef struct spellfix1_vtab spellfix1_vtab; -typedef struct spellfix1_cursor spellfix1_cursor; - -/* Fuzzy-search virtual table object */ -struct spellfix1_vtab { - sqlite3_vtab base; /* Base class - must be first */ - sqlite3 *db; /* Database connection */ - char *zDbName; /* Name of database holding this table */ - char *zTableName; /* Name of the virtual table */ - char *zCostTable; /* Table holding edit-distance cost numbers */ - EditDist3Config *pConfig3; /* Parsed edit distance costs */ -}; - -/* Fuzzy-search cursor object */ -struct spellfix1_cursor { - sqlite3_vtab_cursor base; /* Base class - must be first */ - spellfix1_vtab *pVTab; /* The table to which this cursor belongs */ - char *zPattern; /* rhs of MATCH clause */ - int nRow; /* Number of rows of content */ - int nAlloc; /* Number of allocated rows */ - int iRow; /* Current row of content */ - int iLang; /* Value of the langid= constraint */ - int iTop; /* Value of the top= constraint */ - int iScope; /* Value of the scope= constraint */ - int nSearch; /* Number of vocabulary items checked */ - sqlite3_stmt *pFullScan; /* Shadow query for a full table scan */ - struct spellfix1_row { /* For each row of content */ - sqlite3_int64 iRowid; /* Rowid for this row */ - char *zWord; /* Text for this row */ - int iRank; /* Rank for this row */ - int iDistance; /* Distance from pattern for this row */ - int iScore; /* Score for sorting */ - int iMatchlen; /* Value of matchlen column (or -1) */ - char zHash[SPELLFIX_MX_HASH]; /* the phonehash used for this match */ - } *a; -}; - -/* -** Construct one or more SQL statements from the format string given -** and then evaluate those statements. The success code is written -** into *pRc. -** -** If *pRc is initially non-zero then this routine is a no-op. -*/ -static void spellfix1DbExec( - int *pRc, /* Success code */ - sqlite3 *db, /* Database in which to run SQL */ - const char *zFormat, /* Format string for SQL */ - ... /* Arguments to the format string */ -){ - va_list ap; - char *zSql; - if( *pRc ) return; - va_start(ap, zFormat); - zSql = sqlite3_vmprintf(zFormat, ap); - va_end(ap); - if( zSql==0 ){ - *pRc = SQLITE_NOMEM; - }else{ - *pRc = sqlite3_exec(db, zSql, 0, 0, 0); - sqlite3_free(zSql); - } -} - -/* -** xDisconnect/xDestroy method for the fuzzy-search module. -*/ -static int spellfix1Uninit(int isDestroy, sqlite3_vtab *pVTab){ - spellfix1_vtab *p = (spellfix1_vtab*)pVTab; - int rc = SQLITE_OK; - if( isDestroy ){ - sqlite3 *db = p->db; - spellfix1DbExec(&rc, db, "DROP TABLE IF EXISTS \"%w\".\"%w_vocab\"", - p->zDbName, p->zTableName); - } - if( rc==SQLITE_OK ){ - sqlite3_free(p->zTableName); - editDist3ConfigDelete(p->pConfig3); - sqlite3_free(p->zCostTable); - sqlite3_free(p); - } - return rc; -} -static int spellfix1Disconnect(sqlite3_vtab *pVTab){ - return spellfix1Uninit(0, pVTab); -} -static int spellfix1Destroy(sqlite3_vtab *pVTab){ - return spellfix1Uninit(1, pVTab); -} - -/* -** Make a copy of a string. Remove leading and trailing whitespace -** and dequote it. -*/ -static char *spellfix1Dequote(const char *zIn){ - char *zOut; - int i, j; - char c; - while( isspace(zIn[0]) ) zIn++; - zOut = sqlite3_mprintf("%s", zIn); - if( zOut==0 ) return 0; - i = (int)strlen(zOut); -#if 0 /* The parser will never leave spaces at the end */ - while( i>0 && isspace(zOut[i-1]) ){ i--; } -#endif - zOut[i] = 0; - c = zOut[0]; - if( c=='\'' || c=='"' ){ - for(i=1, j=0; ALWAYS(zOut[i]); i++){ - zOut[j++] = zOut[i]; - if( zOut[i]==c ){ - if( zOut[i+1]==c ){ - i++; - }else{ - zOut[j-1] = 0; - break; - } - } - } - } - return zOut; -} - - -/* -** xConnect/xCreate method for the spellfix1 module. Arguments are: -** -** argv[0] -> module name ("spellfix1") -** argv[1] -> database name -** argv[2] -> table name -** argv[3].. -> optional arguments (i.e. "edit_cost_table" parameter) -*/ -static int spellfix1Init( - int isCreate, - sqlite3 *db, - void *pAux, - int argc, const char *const*argv, - sqlite3_vtab **ppVTab, - char **pzErr -){ - spellfix1_vtab *pNew = 0; - const char *zModule = argv[0]; - const char *zDbName = argv[1]; - const char *zTableName = argv[2]; - int nDbName; - int rc = SQLITE_OK; - int i; - - nDbName = (int)strlen(zDbName); - pNew = sqlite3_malloc( sizeof(*pNew) + nDbName + 1); - if( pNew==0 ){ - rc = SQLITE_NOMEM; - }else{ - memset(pNew, 0, sizeof(*pNew)); - pNew->zDbName = (char*)&pNew[1]; - memcpy(pNew->zDbName, zDbName, nDbName+1); - pNew->zTableName = sqlite3_mprintf("%s", zTableName); - pNew->db = db; - if( pNew->zTableName==0 ){ - rc = SQLITE_NOMEM; - }else{ - rc = sqlite3_declare_vtab(db, - "CREATE TABLE x(word,rank,distance,langid, " - "score, matchlen, phonehash HIDDEN, " - "top HIDDEN, scope HIDDEN, srchcnt HIDDEN, " - "soundslike HIDDEN, command HIDDEN)" - ); -#define SPELLFIX_COL_WORD 0 -#define SPELLFIX_COL_RANK 1 -#define SPELLFIX_COL_DISTANCE 2 -#define SPELLFIX_COL_LANGID 3 -#define SPELLFIX_COL_SCORE 4 -#define SPELLFIX_COL_MATCHLEN 5 -#define SPELLFIX_COL_PHONEHASH 6 -#define SPELLFIX_COL_TOP 7 -#define SPELLFIX_COL_SCOPE 8 -#define SPELLFIX_COL_SRCHCNT 9 -#define SPELLFIX_COL_SOUNDSLIKE 10 -#define SPELLFIX_COL_COMMAND 11 - } - if( rc==SQLITE_OK && isCreate ){ - sqlite3_uint64 r; - spellfix1DbExec(&rc, db, - "CREATE TABLE IF NOT EXISTS \"%w\".\"%w_vocab\"(\n" - " id INTEGER PRIMARY KEY,\n" - " rank INT,\n" - " langid INT,\n" - " word TEXT,\n" - " k1 TEXT,\n" - " k2 TEXT\n" - ");\n", - zDbName, zTableName - ); - sqlite3_randomness(sizeof(r), &r); - spellfix1DbExec(&rc, db, - "CREATE INDEX IF NOT EXISTS \"%w\".\"%w_index_%llx\" " - "ON \"%w_vocab\"(langid,k2);", - zDbName, zModule, r, zTableName - ); - } - for(i=3; rc==SQLITE_OK && ibase); - }else{ - *ppVTab = (sqlite3_vtab *)pNew; - } - return rc; -} - -/* -** The xConnect and xCreate methods -*/ -static int spellfix1Connect( - sqlite3 *db, - void *pAux, - int argc, const char *const*argv, - sqlite3_vtab **ppVTab, - char **pzErr -){ - return spellfix1Init(0, db, pAux, argc, argv, ppVTab, pzErr); -} -static int spellfix1Create( - sqlite3 *db, - void *pAux, - int argc, const char *const*argv, - sqlite3_vtab **ppVTab, - char **pzErr -){ - return spellfix1Init(1, db, pAux, argc, argv, ppVTab, pzErr); -} - -/* -** Clear all of the content from a cursor. -*/ -static void spellfix1ResetCursor(spellfix1_cursor *pCur){ - int i; - for(i=0; inRow; i++){ - sqlite3_free(pCur->a[i].zWord); - } - pCur->nRow = 0; - pCur->iRow = 0; - pCur->nSearch = 0; - if( pCur->pFullScan ){ - sqlite3_finalize(pCur->pFullScan); - pCur->pFullScan = 0; - } -} - -/* -** Resize the cursor to hold up to N rows of content -*/ -static void spellfix1ResizeCursor(spellfix1_cursor *pCur, int N){ - struct spellfix1_row *aNew; - assert( N>=pCur->nRow ); - aNew = sqlite3_realloc(pCur->a, sizeof(pCur->a[0])*N); - if( aNew==0 && N>0 ){ - spellfix1ResetCursor(pCur); - sqlite3_free(pCur->a); - pCur->nAlloc = 0; - pCur->a = 0; - }else{ - pCur->nAlloc = N; - pCur->a = aNew; - } -} - - -/* -** Close a fuzzy-search cursor. -*/ -static int spellfix1Close(sqlite3_vtab_cursor *cur){ - spellfix1_cursor *pCur = (spellfix1_cursor *)cur; - spellfix1ResetCursor(pCur); - spellfix1ResizeCursor(pCur, 0); - sqlite3_free(pCur->zPattern); - sqlite3_free(pCur); - return SQLITE_OK; -} - -/* -** Search for terms of these forms: -** -** (A) word MATCH $str -** (B) langid == $langid -** (C) top = $top -** (D) scope = $scope -** (E) distance < $distance -** (F) distance <= $distance -** -** The plan number is a bit mask formed with these bits: -** -** 0x01 (A) is found -** 0x02 (B) is found -** 0x04 (C) is found -** 0x08 (D) is found -** 0x10 (E) is found -** 0x20 (F) is found -** -** filter.argv[*] values contains $str, $langid, $top, and $scope, -** if specified and in that order. -*/ -static int spellfix1BestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){ - int iPlan = 0; - int iLangTerm = -1; - int iTopTerm = -1; - int iScopeTerm = -1; - int iDistTerm = -1; - int i; - const struct sqlite3_index_constraint *pConstraint; - pConstraint = pIdxInfo->aConstraint; - for(i=0; inConstraint; i++, pConstraint++){ - if( pConstraint->usable==0 ) continue; - - /* Terms of the form: word MATCH $str */ - if( (iPlan & 1)==0 - && pConstraint->iColumn==SPELLFIX_COL_WORD - && pConstraint->op==SQLITE_INDEX_CONSTRAINT_MATCH - ){ - iPlan |= 1; - pIdxInfo->aConstraintUsage[i].argvIndex = 1; - pIdxInfo->aConstraintUsage[i].omit = 1; - } - - /* Terms of the form: langid = $langid */ - if( (iPlan & 2)==0 - && pConstraint->iColumn==SPELLFIX_COL_LANGID - && pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ - ){ - iPlan |= 2; - iLangTerm = i; - } - - /* Terms of the form: top = $top */ - if( (iPlan & 4)==0 - && pConstraint->iColumn==SPELLFIX_COL_TOP - && pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ - ){ - iPlan |= 4; - iTopTerm = i; - } - - /* Terms of the form: scope = $scope */ - if( (iPlan & 8)==0 - && pConstraint->iColumn==SPELLFIX_COL_SCOPE - && pConstraint->op==SQLITE_INDEX_CONSTRAINT_EQ - ){ - iPlan |= 8; - iScopeTerm = i; - } - - /* Terms of the form: distance < $dist or distance <= $dist */ - if( (iPlan & (16|32))==0 - && pConstraint->iColumn==SPELLFIX_COL_DISTANCE - && (pConstraint->op==SQLITE_INDEX_CONSTRAINT_LT - || pConstraint->op==SQLITE_INDEX_CONSTRAINT_LE) - ){ - iPlan |= pConstraint->op==SQLITE_INDEX_CONSTRAINT_LT ? 16 : 32; - iDistTerm = i; - } - } - if( iPlan&1 ){ - int idx = 2; - pIdxInfo->idxNum = iPlan; - if( pIdxInfo->nOrderBy==1 - && pIdxInfo->aOrderBy[0].iColumn==SPELLFIX_COL_SCORE - && pIdxInfo->aOrderBy[0].desc==0 - ){ - pIdxInfo->orderByConsumed = 1; /* Default order by iScore */ - } - if( iPlan&2 ){ - pIdxInfo->aConstraintUsage[iLangTerm].argvIndex = idx++; - pIdxInfo->aConstraintUsage[iLangTerm].omit = 1; - } - if( iPlan&4 ){ - pIdxInfo->aConstraintUsage[iTopTerm].argvIndex = idx++; - pIdxInfo->aConstraintUsage[iTopTerm].omit = 1; - } - if( iPlan&8 ){ - pIdxInfo->aConstraintUsage[iScopeTerm].argvIndex = idx++; - pIdxInfo->aConstraintUsage[iScopeTerm].omit = 1; - } - if( iPlan&(16|32) ){ - pIdxInfo->aConstraintUsage[iDistTerm].argvIndex = idx++; - pIdxInfo->aConstraintUsage[iDistTerm].omit = 1; - } - pIdxInfo->estimatedCost = (double)10000; - }else{ - pIdxInfo->idxNum = 0; - pIdxInfo->estimatedCost = (double)10000000; - } - return SQLITE_OK; -} - -/* -** Open a new fuzzy-search cursor. -*/ -static int spellfix1Open(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){ - spellfix1_vtab *p = (spellfix1_vtab*)pVTab; - spellfix1_cursor *pCur; - pCur = sqlite3_malloc( sizeof(*pCur) ); - if( pCur==0 ) return SQLITE_NOMEM; - memset(pCur, 0, sizeof(*pCur)); - pCur->pVTab = p; - *ppCursor = &pCur->base; - return SQLITE_OK; -} - -/* -** Adjust a distance measurement by the words rank in order to show -** preference to common words. -*/ -static int spellfix1Score(int iDistance, int iRank){ - int iLog2; - for(iLog2=0; iRank>0; iLog2++, iRank>>=1){} - return iDistance + 32 - iLog2; -} - -/* -** Compare two spellfix1_row objects for sorting purposes in qsort() such -** that they sort in order of increasing distance. -*/ -static int spellfix1RowCompare(const void *A, const void *B){ - const struct spellfix1_row *a = (const struct spellfix1_row*)A; - const struct spellfix1_row *b = (const struct spellfix1_row*)B; - return a->iScore - b->iScore; -} - -/* -** A structure used to pass information from spellfix1FilterForMatch() -** into spellfix1RunQuery(). -*/ -typedef struct MatchQuery { - spellfix1_cursor *pCur; /* The cursor being queried */ - sqlite3_stmt *pStmt; /* shadow table query statment */ - char zHash[SPELLFIX_MX_HASH]; /* The current phonehash for zPattern */ - const char *zPattern; /* Transliterated input string */ - int nPattern; /* Length of zPattern */ - EditDist3FromString *pMatchStr3; /* Original unicode string */ - EditDist3Config *pConfig3; /* Edit-distance cost coefficients */ - const EditDist3Lang *pLang; /* The selected language coefficients */ - int iLang; /* The language id */ - int iScope; /* Default scope */ - int iMaxDist; /* Maximum allowed edit distance, or -1 */ - int rc; /* Error code */ - int nRun; /* Number of prior runs for the same zPattern */ - char azPrior[SPELLFIX_MX_RUN][SPELLFIX_MX_HASH]; /* Prior hashes */ -} MatchQuery; - -/* -** Run a query looking for the best matches against zPattern using -** zHash as the character class seed hash. -*/ -static void spellfix1RunQuery(MatchQuery *p, const char *zQuery, int nQuery){ - const char *zK1; - const char *zWord; - int iDist; - int iRank; - int iScore; - int iWorst = 0; - int idx; - int idxWorst = -1; - int i; - int iScope = p->iScope; - spellfix1_cursor *pCur = p->pCur; - sqlite3_stmt *pStmt = p->pStmt; - char zHash1[SPELLFIX_MX_HASH]; - char zHash2[SPELLFIX_MX_HASH]; - char *zClass; - int nClass; - int rc; - - if( pCur->a==0 || p->rc ) return; /* Prior memory allocation failure */ - zClass = (char*)phoneticHash((unsigned char*)zQuery, nQuery); - if( zClass==0 ){ - p->rc = SQLITE_NOMEM; - return; - } - nClass = (int)strlen(zClass); - if( nClass>SPELLFIX_MX_HASH-2 ){ - nClass = SPELLFIX_MX_HASH-2; - zClass[nClass] = 0; - } - if( nClass<=iScope ){ - if( nClass>2 ){ - iScope = nClass-1; - }else{ - iScope = nClass; - } - } - memcpy(zHash1, zClass, iScope); - sqlite3_free(zClass); - zHash1[iScope] = 0; - memcpy(zHash2, zHash1, iScope); - zHash2[iScope] = 'Z'; - zHash2[iScope+1] = 0; -#if SPELLFIX_MX_RUN>1 - for(i=0; inRun; i++){ - if( strcmp(p->azPrior[i], zHash1)==0 ) return; - } -#endif - assert( p->nRunazPrior[p->nRun++], zHash1, iScope+1); - if( sqlite3_bind_text(pStmt, 1, zHash1, -1, SQLITE_STATIC)==SQLITE_NOMEM - || sqlite3_bind_text(pStmt, 2, zHash2, -1, SQLITE_STATIC)==SQLITE_NOMEM - ){ - p->rc = SQLITE_NOMEM; - return; - } -#if SPELLFIX_MX_RUN>1 - for(i=0; inRow; i++){ - if( pCur->a[i].iScore>iWorst ){ - iWorst = pCur->a[i].iScore; - idxWorst = i; - } - } -#endif - while( sqlite3_step(pStmt)==SQLITE_ROW ){ - int iMatchlen = -1; - iRank = sqlite3_column_int(pStmt, 2); - if( p->pMatchStr3 ){ - int nWord = sqlite3_column_bytes(pStmt, 1); - zWord = (const char*)sqlite3_column_text(pStmt, 1); - iDist = editDist3Core(p->pMatchStr3, zWord, nWord, p->pLang, &iMatchlen); - }else{ - zK1 = (const char*)sqlite3_column_text(pStmt, 3); - if( zK1==0 ) continue; - iDist = editdist1(p->zPattern, zK1, 0); - } - if( iDist<0 ){ - p->rc = SQLITE_NOMEM; - break; - } - pCur->nSearch++; - iScore = spellfix1Score(iDist,iRank); - if( p->iMaxDist>=0 ){ - if( iDist>p->iMaxDist ) continue; - if( pCur->nRow>=pCur->nAlloc-1 ){ - spellfix1ResizeCursor(pCur, pCur->nAlloc*2 + 10); - if( pCur->a==0 ) break; - } - idx = pCur->nRow; - }else if( pCur->nRownAlloc ){ - idx = pCur->nRow; - }else if( iScorea[idx].zWord); - }else{ - continue; - } - pCur->a[idx].zWord = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1)); - if( pCur->a[idx].zWord==0 ){ - p->rc = SQLITE_NOMEM; - break; - } - pCur->a[idx].iRowid = sqlite3_column_int64(pStmt, 0); - pCur->a[idx].iRank = iRank; - pCur->a[idx].iDistance = iDist; - pCur->a[idx].iScore = iScore; - pCur->a[idx].iMatchlen = iMatchlen; - memcpy(pCur->a[idx].zHash, zHash1, iScope+1); - if( pCur->nRownAlloc ) pCur->nRow++; - if( pCur->nRow==pCur->nAlloc ){ - iWorst = pCur->a[0].iScore; - idxWorst = 0; - for(i=1; inRow; i++){ - iScore = pCur->a[i].iScore; - if( iWorstrc = rc; -} - -/* -** This version of the xFilter method work if the MATCH term is present -** and we are doing a scan. -*/ -static int spellfix1FilterForMatch( - spellfix1_cursor *pCur, - int idxNum, - int argc, - sqlite3_value **argv -){ - const unsigned char *zMatchThis; /* RHS of the MATCH operator */ - EditDist3FromString *pMatchStr3 = 0; /* zMatchThis as an editdist string */ - char *zPattern; /* Transliteration of zMatchThis */ - int nPattern; /* Length of zPattern */ - int iLimit = 20; /* Max number of rows of output */ - int iScope = 3; /* Use this many characters of zClass */ - int iLang = 0; /* Language code */ - char *zSql; /* SQL of shadow table query */ - sqlite3_stmt *pStmt = 0; /* Shadow table query */ - int rc; /* Result code */ - int idx = 1; /* Next available filter parameter */ - spellfix1_vtab *p = pCur->pVTab; /* The virtual table that owns pCur */ - MatchQuery x; /* For passing info to RunQuery() */ - - /* Load the cost table if we have not already done so */ - if( p->zCostTable!=0 && p->pConfig3==0 ){ - p->pConfig3 = sqlite3_malloc( sizeof(p->pConfig3[0]) ); - if( p->pConfig3==0 ) return SQLITE_NOMEM; - memset(p->pConfig3, 0, sizeof(p->pConfig3[0])); - rc = editDist3ConfigLoad(p->pConfig3, p->db, p->zCostTable); - if( rc ) return rc; - } - memset(&x, 0, sizeof(x)); - x.iScope = 3; /* Default scope if none specified by "WHERE scope=N" */ - x.iMaxDist = -1; /* Maximum allowed edit distance */ - - if( idxNum&2 ){ - iLang = sqlite3_value_int(argv[idx++]); - } - if( idxNum&4 ){ - iLimit = sqlite3_value_int(argv[idx++]); - if( iLimit<1 ) iLimit = 1; - } - if( idxNum&8 ){ - x.iScope = sqlite3_value_int(argv[idx++]); - if( x.iScope<1 ) x.iScope = 1; - if( x.iScope>SPELLFIX_MX_HASH-2 ) x.iScope = SPELLFIX_MX_HASH-2; - } - if( idxNum&(16|32) ){ - x.iMaxDist = sqlite3_value_int(argv[idx++]); - if( idxNum&16 ) x.iMaxDist--; - if( x.iMaxDist<0 ) x.iMaxDist = 0; - } - spellfix1ResetCursor(pCur); - spellfix1ResizeCursor(pCur, iLimit); - zMatchThis = sqlite3_value_text(argv[0]); - if( zMatchThis==0 ) return SQLITE_OK; - if( p->pConfig3 ){ - x.pLang = editDist3FindLang(p->pConfig3, iLang); - pMatchStr3 = editDist3FromStringNew(x.pLang, (const char*)zMatchThis, -1); - if( pMatchStr3==0 ){ - x.rc = SQLITE_NOMEM; - goto filter_exit; - } - }else{ - x.pLang = 0; - } - zPattern = (char*)transliterate(zMatchThis, sqlite3_value_bytes(argv[0])); - sqlite3_free(pCur->zPattern); - pCur->zPattern = zPattern; - if( zPattern==0 ){ - x.rc = SQLITE_NOMEM; - goto filter_exit; - } - nPattern = (int)strlen(zPattern); - if( zPattern[nPattern-1]=='*' ) nPattern--; - zSql = sqlite3_mprintf( - "SELECT id, word, rank, k1" - " FROM \"%w\".\"%w_vocab\"" - " WHERE langid=%d AND k2>=?1 AND k2zDbName, p->zTableName, iLang - ); - if( zSql==0 ){ - x.rc = SQLITE_NOMEM; - pStmt = 0; - goto filter_exit; - } - rc = sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0); - sqlite3_free(zSql); - pCur->iLang = iLang; - x.pCur = pCur; - x.pStmt = pStmt; - x.zPattern = zPattern; - x.nPattern = nPattern; - x.pMatchStr3 = pMatchStr3; - x.iLang = iLang; - x.rc = rc; - x.pConfig3 = p->pConfig3; - if( x.rc==SQLITE_OK ){ - spellfix1RunQuery(&x, zPattern, nPattern); - } - - if( pCur->a ){ - qsort(pCur->a, pCur->nRow, sizeof(pCur->a[0]), spellfix1RowCompare); - pCur->iTop = iLimit; - pCur->iScope = iScope; - }else{ - x.rc = SQLITE_NOMEM; - } - -filter_exit: - sqlite3_finalize(pStmt); - editDist3FromStringDelete(pMatchStr3); - return x.rc; -} - -/* -** This version of xFilter handles a full-table scan case -*/ -static int spellfix1FilterForFullScan( - spellfix1_cursor *pCur, - int idxNum, - int argc, - sqlite3_value **argv -){ - int rc; - char *zSql; - spellfix1_vtab *pVTab = pCur->pVTab; - spellfix1ResetCursor(pCur); - zSql = sqlite3_mprintf( - "SELECT word, rank, NULL, langid, id FROM \"%w\".\"%w_vocab\"", - pVTab->zDbName, pVTab->zTableName); - if( zSql==0 ) return SQLITE_NOMEM; - rc = sqlite3_prepare_v2(pVTab->db, zSql, -1, &pCur->pFullScan, 0); - sqlite3_free(zSql); - pCur->nRow = pCur->iRow = 0; - if( rc==SQLITE_OK ){ - rc = sqlite3_step(pCur->pFullScan); - if( rc==SQLITE_ROW ){ pCur->iRow = -1; rc = SQLITE_OK; } - if( rc==SQLITE_DONE ){ rc = SQLITE_OK; } - }else{ - pCur->iRow = 0; - } - return rc; -} - - -/* -** Called to "rewind" a cursor back to the beginning so that -** it starts its output over again. Always called at least once -** prior to any spellfix1Column, spellfix1Rowid, or spellfix1Eof call. -*/ -static int spellfix1Filter( - sqlite3_vtab_cursor *cur, - int idxNum, const char *idxStr, - int argc, sqlite3_value **argv -){ - spellfix1_cursor *pCur = (spellfix1_cursor *)cur; - int rc; - if( idxNum & 1 ){ - rc = spellfix1FilterForMatch(pCur, idxNum, argc, argv); - }else{ - rc = spellfix1FilterForFullScan(pCur, idxNum, argc, argv); - } - return rc; -} - - -/* -** Advance a cursor to its next row of output -*/ -static int spellfix1Next(sqlite3_vtab_cursor *cur){ - spellfix1_cursor *pCur = (spellfix1_cursor *)cur; - int rc = SQLITE_OK; - if( pCur->iRow < pCur->nRow ){ - if( pCur->pFullScan ){ - rc = sqlite3_step(pCur->pFullScan); - if( rc!=SQLITE_ROW ) pCur->iRow = pCur->nRow; - if( rc==SQLITE_ROW || rc==SQLITE_DONE ) rc = SQLITE_OK; - }else{ - pCur->iRow++; - } - } - return rc; -} - -/* -** Return TRUE if we are at the end-of-file -*/ -static int spellfix1Eof(sqlite3_vtab_cursor *cur){ - spellfix1_cursor *pCur = (spellfix1_cursor *)cur; - return pCur->iRow>=pCur->nRow; -} - -/* -** Return columns from the current row. -*/ -static int spellfix1Column( - sqlite3_vtab_cursor *cur, - sqlite3_context *ctx, - int i -){ - spellfix1_cursor *pCur = (spellfix1_cursor*)cur; - if( pCur->pFullScan ){ - if( i<=SPELLFIX_COL_LANGID ){ - sqlite3_result_value(ctx, sqlite3_column_value(pCur->pFullScan, i)); - }else{ - sqlite3_result_null(ctx); - } - return SQLITE_OK; - } - switch( i ){ - case SPELLFIX_COL_WORD: { - sqlite3_result_text(ctx, pCur->a[pCur->iRow].zWord, -1, SQLITE_STATIC); - break; - } - case SPELLFIX_COL_RANK: { - sqlite3_result_int(ctx, pCur->a[pCur->iRow].iRank); - break; - } - case SPELLFIX_COL_DISTANCE: { - sqlite3_result_int(ctx, pCur->a[pCur->iRow].iDistance); - break; - } - case SPELLFIX_COL_LANGID: { - sqlite3_result_int(ctx, pCur->iLang); - break; - } - case SPELLFIX_COL_SCORE: { - sqlite3_result_int(ctx, pCur->a[pCur->iRow].iScore); - break; - } - case SPELLFIX_COL_MATCHLEN: { - int iMatchlen = pCur->a[pCur->iRow].iMatchlen; - if( iMatchlen<0 ){ - int nPattern = (int)strlen(pCur->zPattern); - char *zWord = pCur->a[pCur->iRow].zWord; - int nWord = (int)strlen(zWord); - - if( nPattern>0 && pCur->zPattern[nPattern-1]=='*' ){ - char *zTranslit; - int res; - zTranslit = (char *)transliterate((unsigned char *)zWord, nWord); - if( !zTranslit ) return SQLITE_NOMEM; - res = editdist1(pCur->zPattern, zTranslit, &iMatchlen); - sqlite3_free(zTranslit); - if( res<0 ) return SQLITE_NOMEM; - iMatchlen = translen_to_charlen(zWord, nWord, iMatchlen); - }else{ - iMatchlen = utf8Charlen(zWord, nWord); - } - } - - sqlite3_result_int(ctx, iMatchlen); - break; - } - case SPELLFIX_COL_PHONEHASH: { - sqlite3_result_text(ctx, pCur->a[pCur->iRow].zHash, -1, SQLITE_STATIC); - break; - } - case SPELLFIX_COL_TOP: { - sqlite3_result_int(ctx, pCur->iTop); - break; - } - case SPELLFIX_COL_SCOPE: { - sqlite3_result_int(ctx, pCur->iScope); - break; - } - case SPELLFIX_COL_SRCHCNT: { - sqlite3_result_int(ctx, pCur->nSearch); - break; - } - default: { - sqlite3_result_null(ctx); - break; - } - } - return SQLITE_OK; -} - -/* -** The rowid. -*/ -static int spellfix1Rowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){ - spellfix1_cursor *pCur = (spellfix1_cursor*)cur; - if( pCur->pFullScan ){ - *pRowid = sqlite3_column_int64(pCur->pFullScan, 4); - }else{ - *pRowid = pCur->a[pCur->iRow].iRowid; - } - return SQLITE_OK; -} - -/* -** The xUpdate() method. -*/ -static int spellfix1Update( - sqlite3_vtab *pVTab, - int argc, - sqlite3_value **argv, - sqlite_int64 *pRowid -){ - int rc = SQLITE_OK; - sqlite3_int64 rowid, newRowid; - spellfix1_vtab *p = (spellfix1_vtab*)pVTab; - sqlite3 *db = p->db; - - if( argc==1 ){ - /* A delete operation on the rowid given by argv[0] */ - rowid = *pRowid = sqlite3_value_int64(argv[0]); - spellfix1DbExec(&rc, db, "DELETE FROM \"%w\".\"%w_vocab\" " - " WHERE id=%lld", - p->zDbName, p->zTableName, rowid); - }else{ - const unsigned char *zWord = sqlite3_value_text(argv[SPELLFIX_COL_WORD+2]); - int nWord = sqlite3_value_bytes(argv[SPELLFIX_COL_WORD+2]); - int iLang = sqlite3_value_int(argv[SPELLFIX_COL_LANGID+2]); - int iRank = sqlite3_value_int(argv[SPELLFIX_COL_RANK+2]); - const unsigned char *zSoundslike = - sqlite3_value_text(argv[SPELLFIX_COL_SOUNDSLIKE+2]); - int nSoundslike = sqlite3_value_bytes(argv[SPELLFIX_COL_SOUNDSLIKE+2]); - char *zK1, *zK2; - int i; - char c; - - if( zWord==0 ){ - /* Inserts of the form: INSERT INTO table(command) VALUES('xyzzy'); - ** cause zWord to be NULL, so we look at the "command" column to see - ** what special actions to take */ - const char *zCmd = - (const char*)sqlite3_value_text(argv[SPELLFIX_COL_COMMAND+2]); - if( zCmd==0 ){ - pVTab->zErrMsg = sqlite3_mprintf("%s.word may not be NULL", - p->zTableName); - return SQLITE_CONSTRAINT; - } - if( strcmp(zCmd,"reset")==0 ){ - /* Reset the edit cost table (if there is one). */ - editDist3ConfigDelete(p->pConfig3); - p->pConfig3 = 0; - return SQLITE_OK; - } - pVTab->zErrMsg = sqlite3_mprintf("unknown value for %s.command: \"%w\"", - p->zTableName, zCmd); - return SQLITE_ERROR; - } - if( iRank<1 ) iRank = 1; - if( zSoundslike ){ - zK1 = (char*)transliterate(zSoundslike, nSoundslike); - }else{ - zK1 = (char*)transliterate(zWord, nWord); - } - if( zK1==0 ) return SQLITE_NOMEM; - for(i=0; (c = zK1[i])!=0; i++){ - if( c>='A' && c<='Z' ) zK1[i] += 'a' - 'A'; - } - zK2 = (char*)phoneticHash((const unsigned char*)zK1, i); - if( zK2==0 ){ - sqlite3_free(zK1); - return SQLITE_NOMEM; - } - if( sqlite3_value_type(argv[0])==SQLITE_NULL ){ - spellfix1DbExec(&rc, db, - "INSERT INTO \"%w\".\"%w_vocab\"(rank,langid,word,k1,k2) " - "VALUES(%d,%d,%Q,%Q,%Q)", - p->zDbName, p->zTableName, - iRank, iLang, zWord, zK1, zK2 - ); - *pRowid = sqlite3_last_insert_rowid(db); - }else{ - rowid = sqlite3_value_int64(argv[0]); - newRowid = *pRowid = sqlite3_value_int64(argv[1]); - spellfix1DbExec(&rc, db, - "UPDATE \"%w\".\"%w_vocab\" SET id=%lld, rank=%d, langid=%d," - " word=%Q, k1=%Q, k2=%Q WHERE id=%lld", - p->zDbName, p->zTableName, newRowid, iRank, iLang, - zWord, zK1, zK2, rowid - ); - } - sqlite3_free(zK1); - sqlite3_free(zK2); - } - return rc; -} - -/* -** Rename the spellfix1 table. -*/ -static int spellfix1Rename(sqlite3_vtab *pVTab, const char *zNew){ - spellfix1_vtab *p = (spellfix1_vtab*)pVTab; - sqlite3 *db = p->db; - int rc = SQLITE_OK; - char *zNewName = sqlite3_mprintf("%s", zNew); - if( zNewName==0 ){ - return SQLITE_NOMEM; - } - spellfix1DbExec(&rc, db, - "ALTER TABLE \"%w\".\"%w_vocab\" RENAME TO \"%w_vocab\"", - p->zDbName, p->zTableName, zNewName - ); - if( rc==SQLITE_OK ){ - sqlite3_free(p->zTableName); - p->zTableName = zNewName; - }else{ - sqlite3_free(zNewName); - } - return rc; -} - - -/* -** A virtual table module that provides fuzzy search. -*/ -static sqlite3_module spellfix1Module = { - 0, /* iVersion */ - spellfix1Create, /* xCreate - handle CREATE VIRTUAL TABLE */ - spellfix1Connect, /* xConnect - reconnected to an existing table */ - spellfix1BestIndex, /* xBestIndex - figure out how to do a query */ - spellfix1Disconnect, /* xDisconnect - close a connection */ - spellfix1Destroy, /* xDestroy - handle DROP TABLE */ - spellfix1Open, /* xOpen - open a cursor */ - spellfix1Close, /* xClose - close a cursor */ - spellfix1Filter, /* xFilter - configure scan constraints */ - spellfix1Next, /* xNext - advance a cursor */ - spellfix1Eof, /* xEof - check for end of scan */ - spellfix1Column, /* xColumn - read data */ - spellfix1Rowid, /* xRowid - read data */ - spellfix1Update, /* xUpdate */ - 0, /* xBegin */ - 0, /* xSync */ - 0, /* xCommit */ - 0, /* xRollback */ - 0, /* xFindMethod */ - spellfix1Rename, /* xRename */ -}; - -/* -** Register the various functions and the virtual table. -*/ -static int spellfix1Register(sqlite3 *db){ - int rc = SQLITE_OK; - int i; - rc = sqlite3_create_function(db, "spellfix1_translit", 1, SQLITE_UTF8, 0, - transliterateSqlFunc, 0, 0); - if( rc==SQLITE_OK ){ - rc = sqlite3_create_function(db, "spellfix1_editdist", 2, SQLITE_UTF8, 0, - editdistSqlFunc, 0, 0); - } - if( rc==SQLITE_OK ){ - rc = sqlite3_create_function(db, "spellfix1_phonehash", 1, SQLITE_UTF8, 0, - phoneticHashSqlFunc, 0, 0); - } - if( rc==SQLITE_OK ){ - rc = sqlite3_create_function(db, "spellfix1_scriptcode", 1, SQLITE_UTF8, 0, - scriptCodeSqlFunc, 0, 0); - } - if( rc==SQLITE_OK ){ - rc = sqlite3_create_module(db, "spellfix1", &spellfix1Module, 0); - } - if( rc==SQLITE_OK ){ - rc = editDist3Install(db); - } - - /* Verify sanity of the translit[] table */ - for(i=0; i