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Overview
Comment:Demonstrate a much faster sqlite3GetToken() routine by using a lookup table to map initial token characters into a character class. This check-in does not work for EBCDIC. More optimization needed.
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Timelines: family | ancestors | descendants | both | tokenizer-char-class
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SHA1: 9115baa1919584dc8ca25bbff54d3b65748a9631
User & Date: drh 2016-02-08 02:30:50.194
Context
2016-02-08
03:23
Faster keywordCode() implementation by taking advantage of the fact that the input is always pure ASCII alphabetic and underscore and that the keyword table is always upper-case. (check-in: ff406b9701 user: drh tags: tokenizer-char-class)
02:30
Demonstrate a much faster sqlite3GetToken() routine by using a lookup table to map initial token characters into a character class. This check-in does not work for EBCDIC. More optimization needed. (check-in: 9115baa191 user: drh tags: tokenizer-char-class)
2016-02-07
00:08
Add the sourcetest target to Makefile.msc. (check-in: ab269e7205 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/tokenize.c.
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** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
*/
#include "sqliteInt.h"
#include <stdlib.h>



















































/*
** The charMap() macro maps alphabetic characters into their
** lower-case ASCII equivalent.  On ASCII machines, this is just
** an upper-to-lower case map.  On EBCDIC machines we also need
** to adjust the encoding.  Only alphabetic characters and underscores
** need to be translated.
*/








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** This file contains C code that splits an SQL input string up into
** individual tokens and sends those tokens one-by-one over to the
** parser for analysis.
*/
#include "sqliteInt.h"
#include <stdlib.h>

/* Character classes for tokenizing */
#define CC_X          0    /* The letter 'x' or 'X'.  Start of x'01234fed' */
#define CC_KYWD       1    /* Alphabetics or '_'.  Usable in a keyword */
#define CC_ID         2    /* unicode characters usable in IDs */
#define CC_DIGIT      3    /* Digits */
#define CC_DOLLAR     4    /* '$' */
#define CC_VARALPHA   5    /* '@', '#', ':'.  Alphabetic SQL variables */
#define CC_VARNUM     6    /* '?'.  Numeric SQL variables */
#define CC_SPACE      7    /* Space characters */
#define CC_QUOTE      8    /* '"', '\'', or '`'.  String literals, quoted ids */
#define CC_QUOTE2     9    /* '['.   [...] style quoted ids */
#define CC_PIPE      10    /* '|'.   Bitwise OR or concatenate */
#define CC_MINUS     11    /* '-'.  Minus or SQL-style comment */
#define CC_LT        12    /* '<'.  Part of < or <= or <> */
#define CC_GT        13    /* '>'.  Part of > or >= */
#define CC_EQ        14    /* '='.  Part of = or == */
#define CC_BANG      15    /* '!'.  Part of != */
#define CC_SLASH     16    /* '/'.  / or c-style comment */
#define CC_LP        17    /* '(' */
#define CC_RP        18    /* ')' */
#define CC_SEMI      19    /* ';' */
#define CC_PLUS      20    /* '+' */
#define CC_STAR      21    /* '*' */
#define CC_PERCENT   22    /* '%' */
#define CC_COMMA     23    /* ',' */
#define CC_AND       24    /* '&' */
#define CC_TILDA     25    /* '~' */
#define CC_DOT       26    /* '.' */
#define CC_ILLEGAL   27    /* Illegal character */

static const unsigned char aiClass[] = {
/*         x0  x1  x2  x3  x4  x5  x6  x7  x8  x9  xa  xb  xc  xd  xe  xf */
/* 0x */   27, 27, 27, 27, 27, 27, 27, 27, 27,  7,  7, 27,  7,  7, 27, 27,
/* 1x */   27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
/* 2x */    7, 15,  8,  5,  4, 22, 24,  8, 17, 18, 21, 20, 23, 11, 26, 16,
/* 3x */    3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  5, 19, 12, 14, 13,  6,
/* 4x */    5,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
/* 5x */    1,  1,  1,  1,  1,  1,  1,  1,  0,  1,  1,  9, 27, 27, 27,  1,
/* 6x */    8,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
/* 7x */    1,  1,  1,  1,  1,  1,  1,  1,  0,  1,  1, 27, 10, 27, 25, 27,
/* 8x */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* 9x */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Ax */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Bx */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Cx */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Dx */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Ex */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
/* Fx */    2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2
};

/*
** The charMap() macro maps alphabetic characters into their
** lower-case ASCII equivalent.  On ASCII machines, this is just
** an upper-to-lower case map.  On EBCDIC machines we also need
** to adjust the encoding.  Only alphabetic characters and underscores
** need to be translated.
*/
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/*
** Return the length of the token that begins at z[0]. 
** Store the token type in *tokenType before returning.
*/
int sqlite3GetToken(const unsigned char *z, int *tokenType){
  int i, c;
  switch( *z ){
    case ' ': case '\t': case '\n': case '\f': case '\r': {
      testcase( z[0]==' ' );
      testcase( z[0]=='\t' );
      testcase( z[0]=='\n' );
      testcase( z[0]=='\f' );
      testcase( z[0]=='\r' );
      for(i=1; sqlite3Isspace(z[i]); i++){}
      *tokenType = TK_SPACE;
      return i;
    }
    case '-': {
      if( z[1]=='-' ){
        for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
        *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
        return i;
      }
      *tokenType = TK_MINUS;
      return 1;
    }
    case '(': {
      *tokenType = TK_LP;
      return 1;
    }
    case ')': {
      *tokenType = TK_RP;
      return 1;
    }
    case ';': {
      *tokenType = TK_SEMI;
      return 1;
    }
    case '+': {
      *tokenType = TK_PLUS;
      return 1;
    }
    case '*': {
      *tokenType = TK_STAR;
      return 1;
    }
    case '/': {
      if( z[1]!='*' || z[2]==0 ){
        *tokenType = TK_SLASH;
        return 1;
      }
      for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
      if( c ) i++;
      *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
      return i;
    }
    case '%': {
      *tokenType = TK_REM;
      return 1;
    }
    case '=': {
      *tokenType = TK_EQ;
      return 1 + (z[1]=='=');
    }
    case '<': {
      if( (c=z[1])=='=' ){
        *tokenType = TK_LE;
        return 2;
      }else if( c=='>' ){
        *tokenType = TK_NE;
        return 2;
      }else if( c=='<' ){
        *tokenType = TK_LSHIFT;
        return 2;
      }else{
        *tokenType = TK_LT;
        return 1;
      }
    }
    case '>': {
      if( (c=z[1])=='=' ){
        *tokenType = TK_GE;
        return 2;
      }else if( c=='>' ){
        *tokenType = TK_RSHIFT;
        return 2;
      }else{
        *tokenType = TK_GT;
        return 1;
      }
    }
    case '!': {
      if( z[1]!='=' ){
        *tokenType = TK_ILLEGAL;
        return 2;
      }else{
        *tokenType = TK_NE;
        return 2;
      }
    }
    case '|': {
      if( z[1]!='|' ){
        *tokenType = TK_BITOR;
        return 1;
      }else{
        *tokenType = TK_CONCAT;
        return 2;
      }
    }
    case ',': {
      *tokenType = TK_COMMA;
      return 1;
    }
    case '&': {
      *tokenType = TK_BITAND;
      return 1;
    }
    case '~': {
      *tokenType = TK_BITNOT;
      return 1;
    }
    case '`':
    case '\'':
    case '"': {
      int delim = z[0];
      testcase( delim=='`' );
      testcase( delim=='\'' );
      testcase( delim=='"' );
      for(i=1; (c=z[i])!=0; i++){
        if( c==delim ){
          if( z[i+1]==delim ){








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/*
** Return the length of the token that begins at z[0]. 
** Store the token type in *tokenType before returning.
*/
int sqlite3GetToken(const unsigned char *z, int *tokenType){
  int i, c;
  switch( aiClass[*z] ){
    case CC_SPACE: {
      testcase( z[0]==' ' );
      testcase( z[0]=='\t' );
      testcase( z[0]=='\n' );
      testcase( z[0]=='\f' );
      testcase( z[0]=='\r' );
      for(i=1; sqlite3Isspace(z[i]); i++){}
      *tokenType = TK_SPACE;
      return i;
    }
    case CC_MINUS: {
      if( z[1]=='-' ){
        for(i=2; (c=z[i])!=0 && c!='\n'; i++){}
        *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
        return i;
      }
      *tokenType = TK_MINUS;
      return 1;
    }
    case CC_LP: {
      *tokenType = TK_LP;
      return 1;
    }
    case CC_RP: {
      *tokenType = TK_RP;
      return 1;
    }
    case CC_SEMI: {
      *tokenType = TK_SEMI;
      return 1;
    }
    case CC_PLUS: {
      *tokenType = TK_PLUS;
      return 1;
    }
    case CC_STAR: {
      *tokenType = TK_STAR;
      return 1;
    }
    case CC_SLASH: {
      if( z[1]!='*' || z[2]==0 ){
        *tokenType = TK_SLASH;
        return 1;
      }
      for(i=3, c=z[2]; (c!='*' || z[i]!='/') && (c=z[i])!=0; i++){}
      if( c ) i++;
      *tokenType = TK_SPACE;   /* IMP: R-22934-25134 */
      return i;
    }
    case CC_PERCENT: {
      *tokenType = TK_REM;
      return 1;
    }
    case CC_EQ: {
      *tokenType = TK_EQ;
      return 1 + (z[1]=='=');
    }
    case CC_LT: {
      if( (c=z[1])=='=' ){
        *tokenType = TK_LE;
        return 2;
      }else if( c=='>' ){
        *tokenType = TK_NE;
        return 2;
      }else if( c=='<' ){
        *tokenType = TK_LSHIFT;
        return 2;
      }else{
        *tokenType = TK_LT;
        return 1;
      }
    }
    case CC_GT: {
      if( (c=z[1])=='=' ){
        *tokenType = TK_GE;
        return 2;
      }else if( c=='>' ){
        *tokenType = TK_RSHIFT;
        return 2;
      }else{
        *tokenType = TK_GT;
        return 1;
      }
    }
    case CC_BANG: {
      if( z[1]!='=' ){
        *tokenType = TK_ILLEGAL;
        return 2;
      }else{
        *tokenType = TK_NE;
        return 2;
      }
    }
    case CC_PIPE: {
      if( z[1]!='|' ){
        *tokenType = TK_BITOR;
        return 1;
      }else{
        *tokenType = TK_CONCAT;
        return 2;
      }
    }
    case CC_COMMA: {
      *tokenType = TK_COMMA;
      return 1;
    }
    case CC_AND: {
      *tokenType = TK_BITAND;
      return 1;
    }
    case CC_TILDA: {
      *tokenType = TK_BITNOT;
      return 1;
    }
    case CC_QUOTE: {


      int delim = z[0];
      testcase( delim=='`' );
      testcase( delim=='\'' );
      testcase( delim=='"' );
      for(i=1; (c=z[i])!=0; i++){
        if( c==delim ){
          if( z[i+1]==delim ){
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        *tokenType = TK_ID;
        return i+1;
      }else{
        *tokenType = TK_ILLEGAL;
        return i;
      }
    }
    case '.': {
#ifndef SQLITE_OMIT_FLOATING_POINT
      if( !sqlite3Isdigit(z[1]) )
#endif
      {
        *tokenType = TK_DOT;
        return 1;
      }
      /* If the next character is a digit, this is a floating point
      ** number that begins with ".".  Fall thru into the next case */
    }
    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9': {
      testcase( z[0]=='0' );  testcase( z[0]=='1' );  testcase( z[0]=='2' );
      testcase( z[0]=='3' );  testcase( z[0]=='4' );  testcase( z[0]=='5' );
      testcase( z[0]=='6' );  testcase( z[0]=='7' );  testcase( z[0]=='8' );
      testcase( z[0]=='9' );
      *tokenType = TK_INTEGER;
#ifndef SQLITE_OMIT_HEX_INTEGER
      if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){








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        *tokenType = TK_ID;
        return i+1;
      }else{
        *tokenType = TK_ILLEGAL;
        return i;
      }
    }
    case CC_DOT: {
#ifndef SQLITE_OMIT_FLOATING_POINT
      if( !sqlite3Isdigit(z[1]) )
#endif
      {
        *tokenType = TK_DOT;
        return 1;
      }
      /* If the next character is a digit, this is a floating point
      ** number that begins with ".".  Fall thru into the next case */
    }
    case CC_DIGIT: {

      testcase( z[0]=='0' );  testcase( z[0]=='1' );  testcase( z[0]=='2' );
      testcase( z[0]=='3' );  testcase( z[0]=='4' );  testcase( z[0]=='5' );
      testcase( z[0]=='6' );  testcase( z[0]=='7' );  testcase( z[0]=='8' );
      testcase( z[0]=='9' );
      *tokenType = TK_INTEGER;
#ifndef SQLITE_OMIT_HEX_INTEGER
      if( z[0]=='0' && (z[1]=='x' || z[1]=='X') && sqlite3Isxdigit(z[2]) ){
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#endif
      while( IdChar(z[i]) ){
        *tokenType = TK_ILLEGAL;
        i++;
      }
      return i;
    }
    case '[': {
      for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
      *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
      return i;
    }
    case '?': {
      *tokenType = TK_VARIABLE;
      for(i=1; sqlite3Isdigit(z[i]); i++){}
      return i;
    }
#ifndef SQLITE_OMIT_TCL_VARIABLE
    case '$':
#endif
    case '@':  /* For compatibility with MS SQL Server */
    case '#':
    case ':': {
      int n = 0;
      testcase( z[0]=='$' );  testcase( z[0]=='@' );
      testcase( z[0]==':' );  testcase( z[0]=='#' );
      *tokenType = TK_VARIABLE;
      for(i=1; (c=z[i])!=0; i++){
        if( IdChar(c) ){
          n++;








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#endif
      while( IdChar(z[i]) ){
        *tokenType = TK_ILLEGAL;
        i++;
      }
      return i;
    }
    case CC_QUOTE2: {
      for(i=1, c=z[0]; c!=']' && (c=z[i])!=0; i++){}
      *tokenType = c==']' ? TK_ID : TK_ILLEGAL;
      return i;
    }
    case CC_VARNUM: {
      *tokenType = TK_VARIABLE;
      for(i=1; sqlite3Isdigit(z[i]); i++){}
      return i;
    }

    case CC_DOLLAR:


    case CC_VARALPHA: {

      int n = 0;
      testcase( z[0]=='$' );  testcase( z[0]=='@' );
      testcase( z[0]==':' );  testcase( z[0]=='#' );
      *tokenType = TK_VARIABLE;
      for(i=1; (c=z[i])!=0; i++){
        if( IdChar(c) ){
          n++;
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          break;
        }
      }
      if( n==0 ) *tokenType = TK_ILLEGAL;
      return i;
    }
#ifndef SQLITE_OMIT_BLOB_LITERAL
    case 'x': case 'X': {
      testcase( z[0]=='x' ); testcase( z[0]=='X' );
      if( z[1]=='\'' ){
        *tokenType = TK_BLOB;
        for(i=2; sqlite3Isxdigit(z[i]); i++){}
        if( z[i]!='\'' || i%2 ){
          *tokenType = TK_ILLEGAL;
          while( z[i] && z[i]!='\'' ){ i++; }
        }
        if( z[i] ) i++;
        return i;
      }
      /* Otherwise fall through to the next case */

    }
#endif
    default: {
      if( !IdChar(*z) ){
        break;
      }
      for(i=1; IdChar(z[i]); i++){}

      *tokenType = TK_ID;
      return keywordCode((char*)z, i, tokenType);
    }



  }

  *tokenType = TK_ILLEGAL;
  return 1;





}

/*
** Run the parser on the given SQL string.  The parser structure is
** passed in.  An SQLITE_ status code is returned.  If an error occurs
** then an and attempt is made to write an error message into 
** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that








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          break;
        }
      }
      if( n==0 ) *tokenType = TK_ILLEGAL;
      return i;
    }
#ifndef SQLITE_OMIT_BLOB_LITERAL
    case CC_X: {
      testcase( z[0]=='x' ); testcase( z[0]=='X' );
      if( z[1]=='\'' ){
        *tokenType = TK_BLOB;
        for(i=2; sqlite3Isxdigit(z[i]); i++){}
        if( z[i]!='\'' || i%2 ){
          *tokenType = TK_ILLEGAL;
          while( z[i] && z[i]!='\'' ){ i++; }
        }
        if( z[i] ) i++;
        return i;
      }
      i = 1;
      break;
    }
#endif
    case CC_KYWD: {



      for(i=1; aiClass[z[i]]<=CC_KYWD; i++){}
      if( aiClass[z[i]]<=CC_DOLLAR ){ i++; break; }
      *tokenType = TK_ID;
      return keywordCode((char*)z, i, tokenType);
    }
    case CC_ID: {
      i = 1;
      break;
    }
    default: {
      *tokenType = TK_ILLEGAL;
      return 1;
    }
  }
  while( aiClass[z[i]]<=CC_DOLLAR ){ i++; }
  *tokenType = TK_ID;
  return i;
}

/*
** Run the parser on the given SQL string.  The parser structure is
** passed in.  An SQLITE_ status code is returned.  If an error occurs
** then an and attempt is made to write an error message into 
** memory obtained from sqlite3_malloc() and to make *pzErrMsg point to that
︙︙