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Overview
Comment:Added TRIM, LTRIM, and RTRIM functions. (CVS 3698)
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SHA1:6fe13eeade4fc7099fbda1e6520640927c08debc
User & Date: drh 2007-03-17 17:52:42
Context
2007-03-17
18:22
Add documentation of the REPLACE, TRIM, LTRIM, and RTRIM functions. (CVS 3699) check-in: d42c9636 user: drh tags: trunk
17:52
Added TRIM, LTRIM, and RTRIM functions. (CVS 3698) check-in: 6fe13eea user: drh tags: trunk
13:27
First cut at an implementation of the REPLACE() function. We might yet make this a compile-time option or move it into a separate source file. (CVS 3697) check-in: c2fe746e user: drh tags: trunk
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Changes to src/func.c.

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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.137 2007/03/17 13:27:55 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
/* #include <math.h> */
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................

  assert( argc==3 );
  if( sqlite3_value_type(argv[0])==SQLITE_NULL ||
      sqlite3_value_type(argv[1])==SQLITE_NULL ||
      sqlite3_value_type(argv[2])==SQLITE_NULL ){
    return;
  }
  nStr = sqlite3_value_bytes(argv[0]);
  zStr = sqlite3_value_text(argv[0]);
  nPattern = sqlite3_value_bytes(argv[1]);
  zPattern = sqlite3_value_text(argv[1]);
  nRep = sqlite3_value_bytes(argv[2]);
  zRep = sqlite3_value_text(argv[2]);

  if( nPattern>=nRep ){
    nOut = nStr;
  }else{
    nOut = (nStr/nPattern + 1)*nRep;
  }
  zOut = sqlite3_malloc(nOut+1);
  if( zOut==0 ) return;
................................................................................
  memcpy(&zOut[j], &zStr[i], nStr-i);
  j += nStr - i;
  assert( j<=nOut );
  zOut[j] = 0;
  sqlite3_result_text(context, (char*)zOut, j, sqlite3_free);
}



















































#ifdef SQLITE_SOUNDEX
/*
** Compute the soundex encoding of a word.
*/
static void soundexFunc(
  sqlite3_context *context,
................................................................................
    ** the only difference between the two being that the sense of the
    ** comparison is inverted. For the max() aggregate, the
    ** sqlite3_user_data() function returns (void *)-1. For min() it
    ** returns (void *)db, where db is the sqlite3* database pointer.
    ** Therefore the next statement sets variable 'max' to 1 for the max()
    ** aggregate, or 0 for min().
    */
    max = ((sqlite3_user_data(context)==(void *)-1)?1:0);
    cmp = sqlite3MemCompare(pBest, pArg, pColl);
    if( (max && cmp<0) || (!max && cmp>0) ){
      sqlite3VdbeMemCopy(pBest, pArg);
    }
  }else{
    sqlite3VdbeMemCopy(pBest, pArg);
  }
................................................................................
** functions.  This should be the only routine in this file with
** external linkage.
*/
void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
  static const struct {
     char *zName;
     signed char nArg;
     u8 argType;           /* 0: none.  1: db  2: (-1) */
     u8 eTextRep;          /* 1: UTF-16.  0: UTF-8 */
     u8 needCollSeq;
     void (*xFunc)(sqlite3_context*,int,sqlite3_value **);
  } aFuncs[] = {
    { "min",               -1, 0, SQLITE_UTF8,    1, minmaxFunc },
    { "min",                0, 0, SQLITE_UTF8,    1, 0          },
    { "max",               -1, 2, SQLITE_UTF8,    1, minmaxFunc },
    { "max",                0, 2, SQLITE_UTF8,    1, 0          },
    { "typeof",             1, 0, SQLITE_UTF8,    0, typeofFunc },
    { "length",             1, 0, SQLITE_UTF8,    0, lengthFunc },
    { "substr",             3, 0, SQLITE_UTF8,    0, substrFunc },
#ifndef SQLITE_OMIT_UTF16
    { "substr",             3, 0, SQLITE_UTF16LE, 0, sqlite3utf16Substr },
#endif
    { "abs",                1, 0, SQLITE_UTF8,    0, absFunc    },
................................................................................
    { "hex",                1, 0, SQLITE_UTF8,    0, hexFunc    },
    { "ifnull",             2, 0, SQLITE_UTF8,    1, ifnullFunc },
    { "random",            -1, 0, SQLITE_UTF8,    0, randomFunc },
    { "randomblob",         1, 0, SQLITE_UTF8,    0, randomBlob },
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 1, SQLITE_UTF8,    0, last_insert_rowid },
    { "changes",            0, 1, SQLITE_UTF8,    0, changes           },
    { "total_changes",      0, 1, SQLITE_UTF8,    0, total_changes     },
    { "replace",            3, 0, SQLITE_UTF8,    0, replaceFunc       },






#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8, 0, soundexFunc},
#endif
#ifndef SQLITE_OMIT_LOAD_EXTENSION
    { "load_extension",     1, 1, SQLITE_UTF8,    0, loadExt },
    { "load_extension",     2, 1, SQLITE_UTF8,    0, loadExt },
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0, SQLITE_UTF8, 0, randStr    },
    { "test_destructor",       1, 1, SQLITE_UTF8, 0, test_destructor},
    { "test_destructor_count", 0, 0, SQLITE_UTF8, 0, test_destructor_count},
    { "test_auxdata",         -1, 0, SQLITE_UTF8, 0, test_auxdata},
    { "test_error",            1, 0, SQLITE_UTF8, 0, test_error},
#endif
  };
  static const struct {
    char *zName;
................................................................................
    signed char nArg;
    u8 argType;
    u8 needCollSeq;
    void (*xStep)(sqlite3_context*,int,sqlite3_value**);
    void (*xFinalize)(sqlite3_context*);
  } aAggs[] = {
    { "min",    1, 0, 1, minmaxStep,   minMaxFinalize },
    { "max",    1, 2, 1, minmaxStep,   minMaxFinalize },
    { "sum",    1, 0, 0, sumStep,      sumFinalize    },
    { "total",  1, 0, 0, sumStep,      totalFinalize    },
    { "avg",    1, 0, 0, sumStep,      avgFinalize    },
    { "count",  0, 0, 0, countStep,    countFinalize  },
    { "count",  1, 0, 0, countStep,    countFinalize  },
  };
  int i;

  for(i=0; i<sizeof(aFuncs)/sizeof(aFuncs[0]); i++){
    void *pArg = 0;
    switch( aFuncs[i].argType ){

      case 1: pArg = db; break;

      case 2: pArg = (void *)(-1); break;
    }
    sqlite3CreateFunc(db, aFuncs[i].zName, aFuncs[i].nArg,
        aFuncs[i].eTextRep, pArg, aFuncs[i].xFunc, 0, 0);
    if( aFuncs[i].needCollSeq ){
      FuncDef *pFunc = sqlite3FindFunction(db, aFuncs[i].zName, 
          strlen(aFuncs[i].zName), aFuncs[i].nArg, aFuncs[i].eTextRep, 0);
      if( pFunc && aFuncs[i].needCollSeq ){
................................................................................
#ifndef SQLITE_OMIT_ALTERTABLE
  sqlite3AlterFunctions(db);
#endif
#ifndef SQLITE_OMIT_PARSER
  sqlite3AttachFunctions(db);
#endif
  for(i=0; i<sizeof(aAggs)/sizeof(aAggs[0]); i++){
    void *pArg = 0;
    switch( aAggs[i].argType ){
      case 1: pArg = db; break;
      case 2: pArg = (void *)(-1); break;
    }
    sqlite3CreateFunc(db, aAggs[i].zName, aAggs[i].nArg, SQLITE_UTF8, 
        pArg, 0, aAggs[i].xStep, aAggs[i].xFinalize);
    if( aAggs[i].needCollSeq ){
      FuncDef *pFunc = sqlite3FindFunction( db, aAggs[i].zName,
          strlen(aAggs[i].zName), aAggs[i].nArg, SQLITE_UTF8, 0);
      if( pFunc && aAggs[i].needCollSeq ){
        pFunc->needCollSeq = 1;







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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.138 2007/03/17 17:52:42 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
/* #include <math.h> */
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................

  assert( argc==3 );
  if( sqlite3_value_type(argv[0])==SQLITE_NULL ||
      sqlite3_value_type(argv[1])==SQLITE_NULL ||
      sqlite3_value_type(argv[2])==SQLITE_NULL ){
    return;
  }

  zStr = sqlite3_value_text(argv[0]);
  nStr = sqlite3_value_bytes(argv[0]);
  zPattern = sqlite3_value_text(argv[1]);
  nPattern = sqlite3_value_bytes(argv[1]);
  zRep = sqlite3_value_text(argv[2]);
  nRep = sqlite3_value_bytes(argv[2]);
  if( nPattern>=nRep ){
    nOut = nStr;
  }else{
    nOut = (nStr/nPattern + 1)*nRep;
  }
  zOut = sqlite3_malloc(nOut+1);
  if( zOut==0 ) return;
................................................................................
  memcpy(&zOut[j], &zStr[i], nStr-i);
  j += nStr - i;
  assert( j<=nOut );
  zOut[j] = 0;
  sqlite3_result_text(context, (char*)zOut, j, sqlite3_free);
}

/*
** Implementation of the TRIM(), LTRIM(), and RTRIM() functions.
** The userdata is 0x1 for left trim, 0x2 for right trim, 0x3 for both.
*/
static void trimFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  const unsigned char *zIn;         /* Input string */
  const unsigned char *zCharSet;    /* Set of characters to trim */
  int nIn;                          /* Number of bytes in input */
  int flags;
  int i;
  unsigned char cFirst, cNext;
  if( sqlite3_value_type(argv[0])==SQLITE_NULL ){
    return;
  }
  zIn = sqlite3_value_text(argv[0]);
  nIn = sqlite3_value_bytes(argv[0]);
  if( argc==1 ){
    static const unsigned char zSpace[] = " ";
    zCharSet = zSpace;
  }else if( sqlite3_value_type(argv[1])==SQLITE_NULL ){
    return;
  }else{
    zCharSet = sqlite3_value_text(argv[1]);
  }
  cFirst = zCharSet[0];
  if( cFirst ){
    flags = (int)sqlite3_user_data(context);
    if( flags & 1 ){
      for(; nIn>0; nIn--, zIn++){
        if( cFirst==zIn[0] ) continue;
        for(i=1; zCharSet[i] && zCharSet[i]!=zIn[0]; i++){}
        if( zCharSet[i]==0 ) break;
      }
    }
    if( flags & 2 ){
      for(; nIn>0; nIn--){
        cNext = zIn[nIn-1];
        if( cFirst==cNext ) continue;
        for(i=1; zCharSet[i] && zCharSet[i]!=cNext; i++){}
        if( zCharSet[i]==0 ) break;
      }
    }
  }
  sqlite3_result_text(context, (char*)zIn, nIn, SQLITE_TRANSIENT);
}

#ifdef SQLITE_SOUNDEX
/*
** Compute the soundex encoding of a word.
*/
static void soundexFunc(
  sqlite3_context *context,
................................................................................
    ** the only difference between the two being that the sense of the
    ** comparison is inverted. For the max() aggregate, the
    ** sqlite3_user_data() function returns (void *)-1. For min() it
    ** returns (void *)db, where db is the sqlite3* database pointer.
    ** Therefore the next statement sets variable 'max' to 1 for the max()
    ** aggregate, or 0 for min().
    */
    max = sqlite3_user_data(context)!=0;
    cmp = sqlite3MemCompare(pBest, pArg, pColl);
    if( (max && cmp<0) || (!max && cmp>0) ){
      sqlite3VdbeMemCopy(pBest, pArg);
    }
  }else{
    sqlite3VdbeMemCopy(pBest, pArg);
  }
................................................................................
** functions.  This should be the only routine in this file with
** external linkage.
*/
void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
  static const struct {
     char *zName;
     signed char nArg;
     u8 argType;           /* ff: db   1: 0, 2: 1, 3: 2,...  N:  N-1. */
     u8 eTextRep;          /* 1: UTF-16.  0: UTF-8 */
     u8 needCollSeq;
     void (*xFunc)(sqlite3_context*,int,sqlite3_value **);
  } aFuncs[] = {
    { "min",               -1, 0, SQLITE_UTF8,    1, minmaxFunc },
    { "min",                0, 0, SQLITE_UTF8,    1, 0          },
    { "max",               -1, 1, SQLITE_UTF8,    1, minmaxFunc },
    { "max",                0, 1, SQLITE_UTF8,    1, 0          },
    { "typeof",             1, 0, SQLITE_UTF8,    0, typeofFunc },
    { "length",             1, 0, SQLITE_UTF8,    0, lengthFunc },
    { "substr",             3, 0, SQLITE_UTF8,    0, substrFunc },
#ifndef SQLITE_OMIT_UTF16
    { "substr",             3, 0, SQLITE_UTF16LE, 0, sqlite3utf16Substr },
#endif
    { "abs",                1, 0, SQLITE_UTF8,    0, absFunc    },
................................................................................
    { "hex",                1, 0, SQLITE_UTF8,    0, hexFunc    },
    { "ifnull",             2, 0, SQLITE_UTF8,    1, ifnullFunc },
    { "random",            -1, 0, SQLITE_UTF8,    0, randomFunc },
    { "randomblob",         1, 0, SQLITE_UTF8,    0, randomBlob },
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 0xff, SQLITE_UTF8, 0, last_insert_rowid },
    { "changes",            0, 0xff, SQLITE_UTF8, 0, changes           },
    { "total_changes",      0, 0xff, SQLITE_UTF8, 0, total_changes     },
    { "replace",            3, 0, SQLITE_UTF8,    0, replaceFunc       },
    { "ltrim",              1, 1, SQLITE_UTF8,    0, trimFunc          },
    { "ltrim",              2, 1, SQLITE_UTF8,    0, trimFunc          },
    { "rtrim",              1, 2, SQLITE_UTF8,    0, trimFunc          },
    { "rtrim",              2, 2, SQLITE_UTF8,    0, trimFunc          },
    { "trim",               1, 3, SQLITE_UTF8,    0, trimFunc          },
    { "trim",               2, 3, SQLITE_UTF8,    0, trimFunc          },
#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8,    0, soundexFunc},
#endif
#ifndef SQLITE_OMIT_LOAD_EXTENSION
    { "load_extension",     1, 0xff, SQLITE_UTF8, 0, loadExt },
    { "load_extension",     2, 0xff, SQLITE_UTF8, 0, loadExt },
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0,    SQLITE_UTF8, 0, randStr    },
    { "test_destructor",       1, 0xff, SQLITE_UTF8, 0, test_destructor},
    { "test_destructor_count", 0, 0,    SQLITE_UTF8, 0, test_destructor_count},
    { "test_auxdata",         -1, 0,    SQLITE_UTF8, 0, test_auxdata},
    { "test_error",            1, 0,    SQLITE_UTF8, 0, test_error},
#endif
  };
  static const struct {
    char *zName;
................................................................................
    signed char nArg;
    u8 argType;
    u8 needCollSeq;
    void (*xStep)(sqlite3_context*,int,sqlite3_value**);
    void (*xFinalize)(sqlite3_context*);
  } aAggs[] = {
    { "min",    1, 0, 1, minmaxStep,   minMaxFinalize },
    { "max",    1, 1, 1, minmaxStep,   minMaxFinalize },
    { "sum",    1, 0, 0, sumStep,      sumFinalize    },
    { "total",  1, 0, 0, sumStep,      totalFinalize    },
    { "avg",    1, 0, 0, sumStep,      avgFinalize    },
    { "count",  0, 0, 0, countStep,    countFinalize  },
    { "count",  1, 0, 0, countStep,    countFinalize  },
  };
  int i;

  for(i=0; i<sizeof(aFuncs)/sizeof(aFuncs[0]); i++){
    void *pArg;
    u8 argType = aFuncs[i].argType;
    if( argType==0xff ){
      pArg = db;
    }else{
      pArg = (void*)(int)argType;
    }
    sqlite3CreateFunc(db, aFuncs[i].zName, aFuncs[i].nArg,
        aFuncs[i].eTextRep, pArg, aFuncs[i].xFunc, 0, 0);
    if( aFuncs[i].needCollSeq ){
      FuncDef *pFunc = sqlite3FindFunction(db, aFuncs[i].zName, 
          strlen(aFuncs[i].zName), aFuncs[i].nArg, aFuncs[i].eTextRep, 0);
      if( pFunc && aFuncs[i].needCollSeq ){
................................................................................
#ifndef SQLITE_OMIT_ALTERTABLE
  sqlite3AlterFunctions(db);
#endif
#ifndef SQLITE_OMIT_PARSER
  sqlite3AttachFunctions(db);
#endif
  for(i=0; i<sizeof(aAggs)/sizeof(aAggs[0]); i++){

    void *pArg = (void*)(int)aAggs[i].argType;



    sqlite3CreateFunc(db, aAggs[i].zName, aAggs[i].nArg, SQLITE_UTF8, 
        pArg, 0, aAggs[i].xStep, aAggs[i].xFinalize);
    if( aAggs[i].needCollSeq ){
      FuncDef *pFunc = sqlite3FindFunction( db, aAggs[i].zName,
          strlen(aAggs[i].zName), aAggs[i].nArg, SQLITE_UTF8, 0);
      if( pFunc && aAggs[i].needCollSeq ){
        pFunc->needCollSeq = 1;

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#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing built-in functions.
#
# $Id: func.test,v 1.58 2007/03/17 13:27:56 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Create a table to work with.
#
do_test func-0.0 {
................................................................................
    DROP TABLE t4;
  }
} {}

# Test that the auxdata API for scalar functions works. This test uses
# a special user-defined function only available in test builds,
# test_auxdata(). Function test_auxdata() takes any number of arguments.
btree_breakpoint
do_test func-13.1 {
  execsql {
    SELECT test_auxdata('hello world');
  }
} {0}

do_test func-13.2 {
................................................................................
} {{This is the larger-main test string}}
do_test func-21.8 {
  execsql {
    SELECT replace("aaaaaaa", "a", "0123456789");
  }
} {0123456789012345678901234567890123456789012345678901234567890123456789}




















































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#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing built-in functions.
#
# $Id: func.test,v 1.59 2007/03/17 17:52:42 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Create a table to work with.
#
do_test func-0.0 {
................................................................................
    DROP TABLE t4;
  }
} {}

# Test that the auxdata API for scalar functions works. This test uses
# a special user-defined function only available in test builds,
# test_auxdata(). Function test_auxdata() takes any number of arguments.

do_test func-13.1 {
  execsql {
    SELECT test_auxdata('hello world');
  }
} {0}

do_test func-13.2 {
................................................................................
} {{This is the larger-main test string}}
do_test func-21.8 {
  execsql {
    SELECT replace("aaaaaaa", "a", "0123456789");
  }
} {0123456789012345678901234567890123456789012345678901234567890123456789}

# Tests for the TRIM, LTRIM and RTRIM functions.
#
do_test func-22.1 {
  catchsql {SELECT trim(1,2,3)}
} {1 {wrong number of arguments to function trim()}}
do_test func-22.2 {
  catchsql {SELECT ltrim(1,2,3)}
} {1 {wrong number of arguments to function ltrim()}}
do_test func-22.3 {
  catchsql {SELECT rtrim(1,2,3)}
} {1 {wrong number of arguments to function rtrim()}}
do_test func-22.4 {
  execsql {SELECT trim('  hi  ');}
} {hi}
do_test func-22.5 {
  execsql {SELECT ltrim('  hi  ');}
} {{hi  }}
do_test func-22.6 {
  execsql {SELECT rtrim('  hi  ');}
} {{  hi}}
do_test func-22.7 {
  execsql {SELECT trim('  hi  ','xyz');}
} {{  hi  }}
do_test func-22.8 {
  execsql {SELECT ltrim('  hi  ','xyz');}
} {{  hi  }}
do_test func-22.9 {
  execsql {SELECT rtrim('  hi  ','xyz');}
} {{  hi  }}
do_test func-22.10 {
  execsql {SELECT trim('xyxzy  hi  zzzy','xyz');}
} {{  hi  }}
do_test func-22.11 {
  execsql {SELECT ltrim('xyxzy  hi  zzzy','xyz');}
} {{  hi  zzzy}}
do_test func-22.12 {
  execsql {SELECT rtrim('xyxzy  hi  zzzy','xyz');}
} {{xyxzy  hi  }}
do_test func-22.13 {
  execsql {SELECT trim('  hi  ','');}
} {{  hi  }}
do_test func-22.20 {
  execsql {SELECT typeof(trim(NULL));}
} {null}
do_test func-22.21 {
  execsql {SELECT typeof(trim(NULL,'xyz'));}
} {null}
do_test func-22.22 {
  execsql {SELECT typeof(trim('hello',NULL));}
} {null}

finish_test