380 lines
9.5 KiB
C
380 lines
9.5 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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** An 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 "winbase.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include "wine/debug.h"
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#include "winnls.h"
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#include "query.h"
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#include "y.tab.h"
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WINE_DEFAULT_DEBUG_CHANNEL(msi);
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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 char *zName; /* The keyword name */
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int tokenType; /* The token value for this keyword */
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};
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/*
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** These are the keywords
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*/
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static const Keyword aKeywordTable[] = {
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{ "ABORT", TK_ABORT },
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{ "AFTER", TK_AFTER },
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{ "ALL", TK_ALL },
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{ "AND", TK_AND },
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{ "AS", TK_AS },
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{ "ASC", TK_ASC },
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{ "BEFORE", TK_BEFORE },
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{ "BEGIN", TK_BEGIN },
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{ "BETWEEN", TK_BETWEEN },
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{ "BY", TK_BY },
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{ "CASCADE", TK_CASCADE },
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{ "CASE", TK_CASE },
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{ "CHECK", TK_CHECK },
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{ "CLUSTER", TK_CLUSTER },
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{ "COLLATE", TK_COLLATE },
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{ "COMMIT", TK_COMMIT },
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{ "CONFLICT", TK_CONFLICT },
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{ "CONSTRAINT", TK_CONSTRAINT },
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{ "COPY", TK_COPY },
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{ "CREATE", TK_CREATE },
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{ "CROSS", TK_JOIN_KW },
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{ "DEFAULT", TK_DEFAULT },
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{ "DEFERRED", TK_DEFERRED },
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{ "DEFERRABLE", TK_DEFERRABLE },
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{ "DELETE", TK_DELETE },
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{ "DELIMITERS", TK_DELIMITERS },
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{ "DESC", TK_DESC },
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{ "DISTINCT", TK_DISTINCT },
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{ "DROP", TK_DROP },
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{ "END", TK_END },
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{ "EACH", TK_EACH },
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{ "ELSE", TK_ELSE },
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{ "EXCEPT", TK_EXCEPT },
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{ "EXPLAIN", TK_EXPLAIN },
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{ "FAIL", TK_FAIL },
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{ "FOR", TK_FOR },
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{ "FOREIGN", TK_FOREIGN },
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{ "FROM", TK_FROM },
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{ "FULL", TK_JOIN_KW },
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{ "GLOB", TK_GLOB },
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{ "GROUP", TK_GROUP },
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{ "HAVING", TK_HAVING },
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{ "IGNORE", TK_IGNORE },
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{ "IMMEDIATE", TK_IMMEDIATE },
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{ "IN", TK_IN },
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{ "INDEX", TK_INDEX },
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{ "INITIALLY", TK_INITIALLY },
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{ "INNER", TK_JOIN_KW },
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{ "INSERT", TK_INSERT },
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{ "INSTEAD", TK_INSTEAD },
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{ "INTERSECT", TK_INTERSECT },
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{ "INTO", TK_INTO },
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{ "IS", TK_IS },
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{ "ISNULL", TK_ISNULL },
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{ "JOIN", TK_JOIN },
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{ "KEY", TK_KEY },
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{ "LEFT", TK_JOIN_KW },
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{ "LIKE", TK_LIKE },
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{ "LIMIT", TK_LIMIT },
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{ "MATCH", TK_MATCH },
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{ "NATURAL", TK_JOIN_KW },
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{ "NOT", TK_NOT },
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{ "NOTNULL", TK_NOTNULL },
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{ "NULL", TK_NULL },
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{ "OF", TK_OF },
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{ "OFFSET", TK_OFFSET },
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{ "ON", TK_ON },
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{ "OR", TK_OR },
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{ "ORDER", TK_ORDER },
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{ "OUTER", TK_JOIN_KW },
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{ "PRAGMA", TK_PRAGMA },
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{ "PRIMARY", TK_PRIMARY },
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{ "RAISE", TK_RAISE },
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{ "REFERENCES", TK_REFERENCES },
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{ "REPLACE", TK_REPLACE },
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{ "RESTRICT", TK_RESTRICT },
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{ "RIGHT", TK_JOIN_KW },
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{ "ROLLBACK", TK_ROLLBACK },
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{ "ROW", TK_ROW },
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{ "SELECT", TK_SELECT },
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{ "SET", TK_SET },
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{ "STATEMENT", TK_STATEMENT },
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{ "TABLE", TK_TABLE },
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{ "TEMP", TK_TEMP },
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{ "TEMPORARY", TK_TEMP },
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{ "THEN", TK_THEN },
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{ "TRANSACTION", TK_TRANSACTION },
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{ "TRIGGER", TK_TRIGGER },
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{ "UNION", TK_UNION },
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{ "UNIQUE", TK_UNIQUE },
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{ "UPDATE", TK_UPDATE },
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{ "USING", TK_USING },
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{ "VACUUM", TK_VACUUM },
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{ "VALUES", TK_VALUES },
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{ "VIEW", TK_VIEW },
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{ "WHEN", TK_WHEN },
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{ "WHERE", TK_WHERE },
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};
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#define KEYWORD_COUNT ( sizeof aKeywordTable/sizeof (Keyword) )
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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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int sqliteKeywordCode(const WCHAR *z, int n){
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int i, len;
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char buffer[0x10];
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len = WideCharToMultiByte( CP_ACP, 0, z, n, buffer, sizeof buffer, NULL, NULL );
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for(i=0; i<KEYWORD_COUNT; i++)
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{
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if(memcmp(buffer, aKeywordTable[i].zName, len))
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continue;
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if(strlen(aKeywordTable[i].zName) == len )
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return aKeywordTable[i].tokenType;
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}
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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, 0, 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, 0, 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){
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int i;
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switch( *z ){
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case ' ': case '\t': case '\n': case '\f': case '\r': {
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for(i=1; isspace(z[i]); i++){}
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*tokenType = TK_SPACE;
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return i;
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}
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case '-': {
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if( z[1]==0 ) return -1;
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if( z[1]=='-' ){
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for(i=2; z[i] && z[i]!='\n'; i++){}
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*tokenType = TK_COMMENT;
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return i;
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}
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*tokenType = TK_MINUS;
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return 1;
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}
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case '(': {
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if( z[1]=='+' && z[2]==')' ){
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*tokenType = TK_ORACLE_OUTER_JOIN;
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return 3;
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}else{
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*tokenType = TK_LP;
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return 1;
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}
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}
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case ')': {
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*tokenType = TK_RP;
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return 1;
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}
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case ';': {
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*tokenType = TK_SEMI;
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return 1;
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}
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case '+': {
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*tokenType = TK_PLUS;
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return 1;
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}
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case '*': {
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*tokenType = TK_STAR;
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return 1;
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}
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case '/': {
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if( z[1]!='*' || z[2]==0 ){
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*tokenType = TK_SLASH;
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return 1;
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}
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for(i=3; z[i] && (z[i]!='/' || z[i-1]!='*'); i++){}
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if( z[i] ) i++;
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*tokenType = TK_COMMENT;
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return i;
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}
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case '%': {
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*tokenType = TK_REM;
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return 1;
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}
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case '=': {
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*tokenType = TK_EQ;
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return 1 + (z[1]=='=');
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}
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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 if( z[1]=='<' ){
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*tokenType = TK_LSHIFT;
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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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}
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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 if( z[1]=='>' ){
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*tokenType = TK_RSHIFT;
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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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}
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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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}
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case '|': {
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if( z[1]!='|' ){
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*tokenType = TK_BITOR;
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return 1;
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}else{
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*tokenType = TK_CONCAT;
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return 2;
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}
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}
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case ',': {
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*tokenType = TK_COMMA;
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return 1;
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}
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case '&': {
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*tokenType = TK_BITAND;
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return 1;
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}
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case '~': {
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*tokenType = TK_BITNOT;
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return 1;
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}
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case '`': 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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if( z[i+1]==delim ){
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i++;
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}else{
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break;
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}
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}
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}
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if( z[i] ) i++;
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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 thru into the next case */
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}
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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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if( z[i]=='.' ){
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i++;
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while( isdigit(z[i]) ){ i++; }
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*tokenType = TK_FLOAT;
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}
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if( (z[i]=='e' || z[i]=='E') &&
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( isdigit(z[i+1])
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|| ((z[i+1]=='+' || z[i+1]=='-') && isdigit(z[i+2]))
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)
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){
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i += 2;
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while( isdigit(z[i]) ){ i++; }
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*tokenType = TK_FLOAT;
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}else if( z[0]=='.' ){
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*tokenType = TK_FLOAT;
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}
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return i;
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}
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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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}
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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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return i;
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}
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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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