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287 lines
9.6 KiB
C
287 lines
9.6 KiB
C
/*
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** 2001 September 15
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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** A tokenizer for SQL
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**
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** This file contains C code that splits an SQL input string up into
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** individual tokens and sends those tokens one-by-one over to the
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** parser for analysis.
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*/
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#include "msipriv.h"
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#include "sql.tab.h"
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/*
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** All the keywords of the SQL language are stored as in a hash
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** table composed of instances of the following structure.
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*/
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typedef struct Keyword Keyword;
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struct Keyword {
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const WCHAR *name; /* The keyword name */
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unsigned int len;
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int tokenType; /* The token value for this keyword */
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};
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#define MAX_TOKEN_LEN 11
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static const WCHAR addW[] = {'A','D','D'};
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static const WCHAR alterW[] = {'A','L','T','E','R'};
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static const WCHAR andW[] = {'A','N','D'};
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static const WCHAR byW[] = {'B','Y'};
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static const WCHAR charW[] = {'C','H','A','R'};
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static const WCHAR characterW[] = {'C','H','A','R','A','C','T','E','R'};
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static const WCHAR createW[] = {'C','R','E','A','T','E'};
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static const WCHAR deleteW[] = {'D','E','L','E','T','E'};
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static const WCHAR distinctW[] = {'D','I','S','T','I','N','C','T'};
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static const WCHAR dropW[] = {'D','R','O','P'};
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static const WCHAR freeW[] = {'F','R','E','E'};
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static const WCHAR fromW[] = {'F','R','O','M'};
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static const WCHAR holdW[] = {'H','O','L','D'};
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static const WCHAR insertW[] = {'I','N','S','E','R','T'};
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static const WCHAR intW[] = {'I','N','T'};
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static const WCHAR integerW[] = {'I','N','T','E','G','E','R'};
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static const WCHAR intoW[] = {'I','N','T','O'};
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static const WCHAR isW[] = {'I','S'};
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static const WCHAR keyW[] = {'K','E','Y'};
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static const WCHAR likeW[] = {'L','I','K','E'};
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static const WCHAR localizableW[] = {'L','O','C','A','L','I','Z','A','B','L','E'};
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static const WCHAR longW[] = {'L','O','N','G'};
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static const WCHAR longcharW[] = {'L','O','N','G','C','H','A','R'};
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static const WCHAR notW[] = {'N','O','T'};
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static const WCHAR nullW[] = {'N','U','L','L'};
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static const WCHAR objectW[] = {'O','B','J','E','C','T'};
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static const WCHAR orW[] = {'O','R'};
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static const WCHAR orderW[] = {'O','R','D','E','R'};
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static const WCHAR primaryW[] = {'P','R','I','M','A','R','Y'};
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static const WCHAR selectW[] = {'S','E','L','E','C','T'};
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static const WCHAR setW[] = {'S','E','T'};
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static const WCHAR shortW[] = {'S','H','O','R','T'};
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static const WCHAR tableW[] = {'T','A','B','L','E'};
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static const WCHAR temporaryW[] = {'T','E','M','P','O','R','A','R','Y'};
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static const WCHAR updateW[] = {'U','P','D','A','T','E'};
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static const WCHAR valuesW[] = {'V','A','L','U','E','S'};
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static const WCHAR whereW[] = {'W','H','E','R','E'};
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#define ARRAY_SIZE(array) (sizeof(array)/sizeof((array)[0]))
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/*
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** These are the keywords
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** They MUST be in alphabetical order
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*/
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static const Keyword aKeywordTable[] = {
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{ addW, ARRAY_SIZE(addW), TK_ADD },
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{ alterW, ARRAY_SIZE(alterW), TK_ALTER },
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{ andW, ARRAY_SIZE(andW), TK_AND },
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{ byW, ARRAY_SIZE(byW), TK_BY },
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{ charW, ARRAY_SIZE(charW), TK_CHAR },
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{ characterW, ARRAY_SIZE(characterW), TK_CHAR },
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{ createW, ARRAY_SIZE(createW), TK_CREATE },
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{ deleteW, ARRAY_SIZE(deleteW), TK_DELETE },
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{ distinctW, ARRAY_SIZE(distinctW), TK_DISTINCT },
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{ dropW, ARRAY_SIZE(dropW), TK_DROP },
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{ freeW, ARRAY_SIZE(freeW), TK_FREE },
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{ fromW, ARRAY_SIZE(fromW), TK_FROM },
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{ holdW, ARRAY_SIZE(holdW), TK_HOLD },
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{ insertW, ARRAY_SIZE(insertW), TK_INSERT },
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{ intW, ARRAY_SIZE(intW), TK_INT },
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{ integerW, ARRAY_SIZE(integerW), TK_INT },
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{ intoW, ARRAY_SIZE(intoW), TK_INTO },
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{ isW, ARRAY_SIZE(isW), TK_IS },
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{ keyW, ARRAY_SIZE(keyW), TK_KEY },
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{ likeW, ARRAY_SIZE(likeW), TK_LIKE },
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{ localizableW, ARRAY_SIZE(localizableW), TK_LOCALIZABLE },
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{ longW, ARRAY_SIZE(longW), TK_LONG },
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{ longcharW, ARRAY_SIZE(longcharW), TK_LONGCHAR },
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{ notW, ARRAY_SIZE(notW), TK_NOT },
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{ nullW, ARRAY_SIZE(nullW), TK_NULL },
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{ objectW, ARRAY_SIZE(objectW), TK_OBJECT },
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{ orW, ARRAY_SIZE(orW), TK_OR },
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{ orderW, ARRAY_SIZE(orderW), TK_ORDER },
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{ primaryW, ARRAY_SIZE(primaryW), TK_PRIMARY },
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{ selectW, ARRAY_SIZE(selectW), TK_SELECT },
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{ setW, ARRAY_SIZE(setW), TK_SET },
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{ shortW, ARRAY_SIZE(shortW), TK_SHORT },
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{ tableW, ARRAY_SIZE(tableW), TK_TABLE },
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{ temporaryW, ARRAY_SIZE(temporaryW), TK_TEMPORARY },
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{ updateW, ARRAY_SIZE(updateW), TK_UPDATE },
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{ valuesW, ARRAY_SIZE(valuesW), TK_VALUES },
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{ whereW, ARRAY_SIZE(whereW), TK_WHERE },
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};
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/*
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** Comparison function for binary search.
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*/
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static int compKeyword(const void *m1, const void *m2){
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const Keyword *k1 = m1, *k2 = m2;
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int ret, len = min( k1->len, k2->len );
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if ((ret = memicmpW( k1->name, k2->name, len ))) return ret;
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if (k1->len < k2->len) return -1;
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else if (k1->len > k2->len) return 1;
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return 0;
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}
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/*
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** This function looks up an identifier to determine if it is a
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** keyword. If it is a keyword, the token code of that keyword is
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** returned. If the input is not a keyword, TK_ID is returned.
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*/
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static int sqliteKeywordCode(const WCHAR *z, int n){
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Keyword key, *r;
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if( n>MAX_TOKEN_LEN )
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return TK_ID;
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key.tokenType = 0;
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key.name = z;
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key.len = n;
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r = bsearch( &key, aKeywordTable, ARRAY_SIZE(aKeywordTable), sizeof(Keyword), compKeyword );
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if( r )
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return r->tokenType;
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return TK_ID;
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}
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/*
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** If X is a character that can be used in an identifier then
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** isIdChar[X] will be 1. Otherwise isIdChar[X] will be 0.
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**
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** In this implementation, an identifier can be a string of
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** alphabetic characters, digits, and "_" plus any character
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** with the high-order bit set. The latter rule means that
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** any sequence of UTF-8 characters or characters taken from
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** an extended ISO8859 character set can form an identifier.
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*/
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static const char isIdChar[] = {
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/* x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF */
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0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 1x */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, /* 2x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 3x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 4x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 5x */
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0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, /* 7x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 8x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 9x */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Ax */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Bx */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Cx */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Dx */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Ex */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* Fx */
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};
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/*
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** Return the length of the token that begins at z[0]. Return
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** -1 if the token is (or might be) incomplete. Store the token
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** type in *tokenType before returning.
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*/
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int sqliteGetToken(const WCHAR *z, int *tokenType, int *skip){
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int i;
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*skip = 0;
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switch( *z ){
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case ' ': case '\t': case '\n': case '\f':
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for(i=1; isspace(z[i]) && z[i] != '\r'; i++){}
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*tokenType = TK_SPACE;
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return i;
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case '-':
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if( z[1]==0 ) return -1;
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*tokenType = TK_MINUS;
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return 1;
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case '(':
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*tokenType = TK_LP;
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return 1;
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case ')':
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*tokenType = TK_RP;
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return 1;
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case '*':
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*tokenType = TK_STAR;
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return 1;
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case '=':
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*tokenType = TK_EQ;
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return 1;
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case '<':
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if( z[1]=='=' ){
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*tokenType = TK_LE;
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return 2;
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}else if( z[1]=='>' ){
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*tokenType = TK_NE;
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return 2;
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}else{
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*tokenType = TK_LT;
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return 1;
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}
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case '>':
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if( z[1]=='=' ){
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*tokenType = TK_GE;
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return 2;
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}else{
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*tokenType = TK_GT;
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return 1;
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}
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case '!':
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if( z[1]!='=' ){
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*tokenType = TK_ILLEGAL;
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return 2;
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}else{
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*tokenType = TK_NE;
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return 2;
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}
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case '?':
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*tokenType = TK_WILDCARD;
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return 1;
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case ',':
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*tokenType = TK_COMMA;
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return 1;
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case '`': case '\'': {
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int delim = z[0];
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for(i=1; z[i]; i++){
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if( z[i]==delim )
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break;
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}
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if( z[i] ) i++;
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if( delim == '`' )
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*tokenType = TK_ID;
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else
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*tokenType = TK_STRING;
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return i;
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}
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case '.':
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if( !isdigit(z[1]) ){
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*tokenType = TK_DOT;
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return 1;
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}
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/* Fall through */
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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*tokenType = TK_INTEGER;
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for(i=1; isdigit(z[i]); i++){}
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return i;
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case '[':
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for(i=1; z[i] && z[i-1]!=']'; i++){}
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*tokenType = TK_ID;
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return i;
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default:
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if( !isIdChar[*z] ){
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break;
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}
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for(i=1; isIdChar[z[i]]; i++){}
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*tokenType = sqliteKeywordCode(z, i);
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if( *tokenType == TK_ID && z[i] == '`' ) *skip = 1;
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return i;
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}
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*tokenType = TK_ILLEGAL;
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return 1;
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}
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