Sweden-Number/dlls/msi/tokenize.c

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/*
** 2001 September 15
**
** 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.
**
*************************************************************************
2011-08-02 22:20:32 +02:00
** A tokenizer for SQL
**
** 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 <ctype.h>
#include <stdarg.h>
#include <stdlib.h>
#include "windef.h"
#include "winbase.h"
#include "query.h"
#include "sql.tab.h"
/*
** All the keywords of the SQL language are stored as in a hash
** table composed of instances of the following structure.
*/
typedef struct Keyword Keyword;
struct Keyword {
const WCHAR *name; /* The keyword name */
unsigned int len;
int tokenType; /* The token value for this keyword */
};
#define MAX_TOKEN_LEN 11
/*
** These are the keywords
** They MUST be in alphabetical order
*/
#define X(str) str, ARRAY_SIZE(str) - 1
static const Keyword aKeywordTable[] = {
{ X(L"ADD"), TK_ADD },
{ X(L"ALTER"), TK_ALTER },
{ X(L"AND"), TK_AND },
{ X(L"BY"), TK_BY },
{ X(L"CHAR"), TK_CHAR },
{ X(L"CHARACTER"), TK_CHAR },
{ X(L"CREATE"), TK_CREATE },
{ X(L"DELETE"), TK_DELETE },
{ X(L"DISTINCT"), TK_DISTINCT },
{ X(L"DROP"), TK_DROP },
{ X(L"FREE"), TK_FREE },
{ X(L"FROM"), TK_FROM },
{ X(L"HOLD"), TK_HOLD },
{ X(L"INSERT"), TK_INSERT },
{ X(L"INT"), TK_INT },
{ X(L"INTEGER"), TK_INT },
{ X(L"INTO"), TK_INTO },
{ X(L"IS"), TK_IS },
{ X(L"KEY"), TK_KEY },
{ X(L"LIKE"), TK_LIKE },
{ X(L"LOCALIZABLE"), TK_LOCALIZABLE },
{ X(L"LONG"), TK_LONG },
{ X(L"LONGCHAR"), TK_LONGCHAR },
{ X(L"NOT"), TK_NOT },
{ X(L"NULL"), TK_NULL },
{ X(L"OBJECT"), TK_OBJECT },
{ X(L"OR"), TK_OR },
{ X(L"ORDER"), TK_ORDER },
{ X(L"PRIMARY"), TK_PRIMARY },
{ X(L"SELECT"), TK_SELECT },
{ X(L"SET"), TK_SET },
{ X(L"SHORT"), TK_SHORT },
{ X(L"TABLE"), TK_TABLE },
{ X(L"TEMPORARY"), TK_TEMPORARY },
{ X(L"UPDATE"), TK_UPDATE },
{ X(L"VALUES"), TK_VALUES },
{ X(L"WHERE"), TK_WHERE },
};
#undef X
/*
** Comparison function for binary search.
*/
static int __cdecl compKeyword(const void *m1, const void *m2){
const Keyword *k1 = m1, *k2 = m2;
int ret, len = min( k1->len, k2->len );
if ((ret = wcsnicmp( k1->name, k2->name, len ))) return ret;
if (k1->len < k2->len) return -1;
else if (k1->len > k2->len) return 1;
return 0;
}
/*
** This function looks up an identifier to determine if it is a
** keyword. If it is a keyword, the token code of that keyword is
** returned. If the input is not a keyword, TK_ID is returned.
*/
static int sqliteKeywordCode(const WCHAR *z, int n){
Keyword key, *r;
if( n>MAX_TOKEN_LEN )
return TK_ID;
key.tokenType = 0;
key.name = z;
key.len = n;
r = bsearch( &key, aKeywordTable, ARRAY_SIZE(aKeywordTable), sizeof(Keyword), compKeyword );
if( r )
return r->tokenType;
return TK_ID;
}
/*
** If X is a character that can be used in an identifier then
** isIdChar[X] will be 1. Otherwise isIdChar[X] will be 0.
**
** In this implementation, an identifier can be a string of
** alphabetic characters, digits, and "_" plus any character
** with the high-order bit set. The latter rule means that
** any sequence of UTF-8 characters or characters taken from
** an extended ISO8859 character set can form an identifier.
*/
static const char isIdChar[] = {
/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, /* 2x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 3x */
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 4x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 5x */
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, /* 7x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 8x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 9x */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Ax */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Bx */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Cx */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Dx */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Ex */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Fx */
};
/*
** WCHAR safe version of isdigit()
*/
static inline int isDigit(WCHAR c)
{
return c >= '0' && c <= '9';
}
/*
** WCHAR safe version of isspace(), except '\r'
*/
static inline int isSpace(WCHAR c)
{
return c == ' ' || c == '\t' || c == '\n' || c == '\f';
}
/*
** Return the length of the token that begins at z[0]. Return
** -1 if the token is (or might be) incomplete. Store the token
** type in *tokenType before returning.
*/
int sqliteGetToken(const WCHAR *z, int *tokenType, int *skip){
int i;
*skip = 0;
switch( *z ){
case ' ': case '\t': case '\n': case '\f':
for(i=1; isSpace(z[i]); i++){}
*tokenType = TK_SPACE;
return i;
case '-':
if( z[1]==0 ) return -1;
*tokenType = TK_MINUS;
return 1;
case '(':
*tokenType = TK_LP;
return 1;
case ')':
*tokenType = TK_RP;
return 1;
case '*':
*tokenType = TK_STAR;
return 1;
case '=':
*tokenType = TK_EQ;
return 1;
case '<':
if( z[1]=='=' ){
*tokenType = TK_LE;
return 2;
}else if( z[1]=='>' ){
*tokenType = TK_NE;
return 2;
}else{
*tokenType = TK_LT;
return 1;
}
case '>':
if( z[1]=='=' ){
*tokenType = TK_GE;
return 2;
}else{
*tokenType = TK_GT;
return 1;
}
case '!':
if( z[1]!='=' ){
*tokenType = TK_ILLEGAL;
return 2;
}else{
*tokenType = TK_NE;
return 2;
}
case '?':
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*tokenType = TK_WILDCARD;
return 1;
case ',':
*tokenType = TK_COMMA;
return 1;
case '`': case '\'': {
int delim = z[0];
for(i=1; z[i]; i++){
if( z[i]==delim )
break;
}
if( z[i] ) i++;
if( delim == '`' )
*tokenType = TK_ID;
else
*tokenType = TK_STRING;
return i;
}
case '.':
if( !isDigit(z[1]) ){
*tokenType = TK_DOT;
return 1;
}
/* Fall through */
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
*tokenType = TK_INTEGER;
for(i=1; isDigit(z[i]); i++){}
return i;
case '[':
for(i=1; z[i] && z[i-1]!=']'; i++){}
*tokenType = TK_ID;
return i;
default:
if( !isIdChar[*z] ){
break;
}
for(i=1; isIdChar[z[i]]; i++){}
*tokenType = sqliteKeywordCode(z, i);
if( *tokenType == TK_ID && z[i] == '`' ) *skip = 1;
return i;
}
*tokenType = TK_ILLEGAL;
return 1;
}