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680 lines
21 KiB
680 lines
21 KiB
/*
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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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** $Id: tokenize.c 410099 2005-05-06 17:52:07Z staniek $
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*/
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#include "sqliteInt.h"
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#include "os.h"
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#include <ctype.h>
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#include <stdlib.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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char *zName; /* The keyword name */
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u8 tokenType; /* Token value for this keyword */
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u8 len; /* Length of this keyword */
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u8 iNext; /* Index in aKeywordTable[] of next with same hash */
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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 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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{ "ATTACH", TK_ATTACH, },
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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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{ "DATABASE", TK_DATABASE, },
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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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{ "DETACH", TK_DETACH, },
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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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/*
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** This is the hash table
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*/
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#define KEY_HASH_SIZE 101
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static u8 aiHashTable[KEY_HASH_SIZE];
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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 char *z, int n){
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int h, i;
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Keyword *p;
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static char needInit = 1;
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if( needInit ){
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/* Initialize the keyword hash table */
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sqliteOsEnterMutex();
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if( needInit ){
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int nk;
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nk = sizeof(aKeywordTable)/sizeof(aKeywordTable[0]);
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for(i=0; i<nk; i++){
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aKeywordTable[i].len = strlen(aKeywordTable[i].zName);
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h = sqliteHashNoCase(aKeywordTable[i].zName, aKeywordTable[i].len);
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h %= KEY_HASH_SIZE;
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aKeywordTable[i].iNext = aiHashTable[h];
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aiHashTable[h] = i+1;
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}
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needInit = 0;
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}
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sqliteOsLeaveMutex();
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}
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h = sqliteHashNoCase(z, n) % KEY_HASH_SIZE;
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for(i=aiHashTable[h]; i; i=p->iNext){
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p = &aKeywordTable[i-1];
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if( p->len==n && sqliteStrNICmp(p->zName, z, n)==0 ){
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return p->tokenType;
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}
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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 and
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** X&0x80==0 then isIdChar[X] will be 1. If X&0x80==0x80 then
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** X is always an identifier character. (Hence all UTF-8
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** characters can be part of an identifier). isIdChar[X] will
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** be 0 for every character in the lower 128 ASCII characters
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** that cannot be used as part of an identifier.
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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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};
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/*
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** Return the length of the token that begins at z[0].
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** Store the token type in *tokenType before returning.
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*/
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static int sqliteGetToken(const unsigned char *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]=='-' ){
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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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*tokenType = TK_LP;
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return 1;
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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 '"': {
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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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*tokenType = TK_DOT;
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return 1;
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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]=='.' && isdigit(z[i+1]) ){
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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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}
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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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}
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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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case '?': {
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*tokenType = TK_VARIABLE;
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return 1;
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}
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default: {
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if( (*z&0x80)==0 && !isIdChar[*z] ){
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break;
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}
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for(i=1; (z[i]&0x80)!=0 || isIdChar[z[i]]; i++){}
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*tokenType = sqliteKeywordCode((char*)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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/*
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** Run the parser on the given SQL string. The parser structure is
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** passed in. An SQLITE_ status code is returned. If an error occurs
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** and pzErrMsg!=NULL then an error message might be written into
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** memory obtained from malloc() and *pzErrMsg made to point to that
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** error message. Or maybe not.
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*/
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int sqliteRunParser(Parse *pParse, const char *zSql, char **pzErrMsg){
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int nErr = 0;
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int i;
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void *pEngine;
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int tokenType;
|
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int lastTokenParsed = -1;
|
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sqlite *db = pParse->db;
|
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extern void *sqliteParserAlloc(void*(*)(int));
|
|
extern void sqliteParserFree(void*, void(*)(void*));
|
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extern int sqliteParser(void*, int, Token, Parse*);
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|
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db->flags &= ~SQLITE_Interrupt;
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pParse->rc = SQLITE_OK;
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i = 0;
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pEngine = sqliteParserAlloc((void*(*)(int))malloc);
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if( pEngine==0 ){
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sqliteSetString(pzErrMsg, "out of memory", (char*)0);
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return 1;
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}
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pParse->sLastToken.dyn = 0;
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pParse->zTail = zSql;
|
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while( sqlite_malloc_failed==0 && zSql[i]!=0 ){
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assert( i>=0 );
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pParse->sLastToken.z = &zSql[i];
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assert( pParse->sLastToken.dyn==0 );
|
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pParse->sLastToken.n = sqliteGetToken((unsigned char*)&zSql[i], &tokenType);
|
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i += pParse->sLastToken.n;
|
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switch( tokenType ){
|
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case TK_SPACE:
|
|
case TK_COMMENT: {
|
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if( (db->flags & SQLITE_Interrupt)!=0 ){
|
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pParse->rc = SQLITE_INTERRUPT;
|
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sqliteSetString(pzErrMsg, "interrupt", (char*)0);
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goto abort_parse;
|
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}
|
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break;
|
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}
|
|
case TK_ILLEGAL: {
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sqliteSetNString(pzErrMsg, "unrecognized token: \"", -1,
|
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pParse->sLastToken.z, pParse->sLastToken.n, "\"", 1, 0);
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nErr++;
|
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goto abort_parse;
|
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}
|
|
case TK_SEMI: {
|
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pParse->zTail = &zSql[i];
|
|
/* Fall thru into the default case */
|
|
}
|
|
default: {
|
|
sqliteParser(pEngine, tokenType, pParse->sLastToken, pParse);
|
|
lastTokenParsed = tokenType;
|
|
if( pParse->rc!=SQLITE_OK ){
|
|
goto abort_parse;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
abort_parse:
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if( zSql[i]==0 && nErr==0 && pParse->rc==SQLITE_OK ){
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if( lastTokenParsed!=TK_SEMI ){
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sqliteParser(pEngine, TK_SEMI, pParse->sLastToken, pParse);
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pParse->zTail = &zSql[i];
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}
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|
sqliteParser(pEngine, 0, pParse->sLastToken, pParse);
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|
}
|
|
sqliteParserFree(pEngine, free);
|
|
if( pParse->rc!=SQLITE_OK && pParse->rc!=SQLITE_DONE && pParse->zErrMsg==0 ){
|
|
sqliteSetString(&pParse->zErrMsg, sqlite_error_string(pParse->rc),
|
|
(char*)0);
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|
}
|
|
if( pParse->zErrMsg ){
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|
if( pzErrMsg && *pzErrMsg==0 ){
|
|
*pzErrMsg = pParse->zErrMsg;
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|
}else{
|
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sqliteFree(pParse->zErrMsg);
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|
}
|
|
pParse->zErrMsg = 0;
|
|
if( !nErr ) nErr++;
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|
}
|
|
if( pParse->pVdbe && pParse->nErr>0 ){
|
|
sqliteVdbeDelete(pParse->pVdbe);
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|
pParse->pVdbe = 0;
|
|
}
|
|
if( pParse->pNewTable ){
|
|
sqliteDeleteTable(pParse->db, pParse->pNewTable);
|
|
pParse->pNewTable = 0;
|
|
}
|
|
if( pParse->pNewTrigger ){
|
|
sqliteDeleteTrigger(pParse->pNewTrigger);
|
|
pParse->pNewTrigger = 0;
|
|
}
|
|
if( nErr>0 && (pParse->rc==SQLITE_OK || pParse->rc==SQLITE_DONE) ){
|
|
pParse->rc = SQLITE_ERROR;
|
|
}
|
|
return nErr;
|
|
}
|
|
|
|
/*
|
|
** Token types used by the sqlite_complete() routine. See the header
|
|
** comments on that procedure for additional information.
|
|
*/
|
|
#define tkEXPLAIN 0
|
|
#define tkCREATE 1
|
|
#define tkTEMP 2
|
|
#define tkTRIGGER 3
|
|
#define tkEND 4
|
|
#define tkSEMI 5
|
|
#define tkWS 6
|
|
#define tkOTHER 7
|
|
|
|
/*
|
|
** Return TRUE if the given SQL string ends in a semicolon.
|
|
**
|
|
** Special handling is require for CREATE TRIGGER statements.
|
|
** Whenever the CREATE TRIGGER keywords are seen, the statement
|
|
** must end with ";END;".
|
|
**
|
|
** This implementation uses a state machine with 7 states:
|
|
**
|
|
** (0) START At the beginning or end of an SQL statement. This routine
|
|
** returns 1 if it ends in the START state and 0 if it ends
|
|
** in any other state.
|
|
**
|
|
** (1) EXPLAIN The keyword EXPLAIN has been seen at the beginning of
|
|
** a statement.
|
|
**
|
|
** (2) CREATE The keyword CREATE has been seen at the beginning of a
|
|
** statement, possibly preceeded by EXPLAIN and/or followed by
|
|
** TEMP or TEMPORARY
|
|
**
|
|
** (3) NORMAL We are in the middle of statement which ends with a single
|
|
** semicolon.
|
|
**
|
|
** (4) TRIGGER We are in the middle of a trigger definition that must be
|
|
** ended by a semicolon, the keyword END, and another semicolon.
|
|
**
|
|
** (5) SEMI We've seen the first semicolon in the ";END;" that occurs at
|
|
** the end of a trigger definition.
|
|
**
|
|
** (6) END We've seen the ";END" of the ";END;" that occurs at the end
|
|
** of a trigger difinition.
|
|
**
|
|
** Transitions between states above are determined by tokens extracted
|
|
** from the input. The following tokens are significant:
|
|
**
|
|
** (0) tkEXPLAIN The "explain" keyword.
|
|
** (1) tkCREATE The "create" keyword.
|
|
** (2) tkTEMP The "temp" or "temporary" keyword.
|
|
** (3) tkTRIGGER The "trigger" keyword.
|
|
** (4) tkEND The "end" keyword.
|
|
** (5) tkSEMI A semicolon.
|
|
** (6) tkWS Whitespace
|
|
** (7) tkOTHER Any other SQL token.
|
|
**
|
|
** Whitespace never causes a state transition and is always ignored.
|
|
*/
|
|
int sqlite_complete(const char *zSql){
|
|
u8 state = 0; /* Current state, using numbers defined in header comment */
|
|
u8 token; /* Value of the next token */
|
|
|
|
/* The following matrix defines the transition from one state to another
|
|
** according to what token is seen. trans[state][token] returns the
|
|
** next state.
|
|
*/
|
|
static const u8 trans[7][8] = {
|
|
/* Token: */
|
|
/* State: ** EXPLAIN CREATE TEMP TRIGGER END SEMI WS OTHER */
|
|
/* 0 START: */ { 1, 2, 3, 3, 3, 0, 0, 3, },
|
|
/* 1 EXPLAIN: */ { 3, 2, 3, 3, 3, 0, 1, 3, },
|
|
/* 2 CREATE: */ { 3, 3, 2, 4, 3, 0, 2, 3, },
|
|
/* 3 NORMAL: */ { 3, 3, 3, 3, 3, 0, 3, 3, },
|
|
/* 4 TRIGGER: */ { 4, 4, 4, 4, 4, 5, 4, 4, },
|
|
/* 5 SEMI: */ { 4, 4, 4, 4, 6, 5, 5, 4, },
|
|
/* 6 END: */ { 4, 4, 4, 4, 4, 0, 6, 4, },
|
|
};
|
|
|
|
while( *zSql ){
|
|
switch( *zSql ){
|
|
case ';': { /* A semicolon */
|
|
token = tkSEMI;
|
|
break;
|
|
}
|
|
case ' ':
|
|
case '\r':
|
|
case '\t':
|
|
case '\n':
|
|
case '\f': { /* White space is ignored */
|
|
token = tkWS;
|
|
break;
|
|
}
|
|
case '/': { /* C-style comments */
|
|
if( zSql[1]!='*' ){
|
|
token = tkOTHER;
|
|
break;
|
|
}
|
|
zSql += 2;
|
|
while( zSql[0] && (zSql[0]!='*' || zSql[1]!='/') ){ zSql++; }
|
|
if( zSql[0]==0 ) return 0;
|
|
zSql++;
|
|
token = tkWS;
|
|
break;
|
|
}
|
|
case '-': { /* SQL-style comments from "--" to end of line */
|
|
if( zSql[1]!='-' ){
|
|
token = tkOTHER;
|
|
break;
|
|
}
|
|
while( *zSql && *zSql!='\n' ){ zSql++; }
|
|
if( *zSql==0 ) return state==0;
|
|
token = tkWS;
|
|
break;
|
|
}
|
|
case '[': { /* Microsoft-style identifiers in [...] */
|
|
zSql++;
|
|
while( *zSql && *zSql!=']' ){ zSql++; }
|
|
if( *zSql==0 ) return 0;
|
|
token = tkOTHER;
|
|
break;
|
|
}
|
|
case '"': /* single- and double-quoted strings */
|
|
case '\'': {
|
|
int c = *zSql;
|
|
zSql++;
|
|
while( *zSql && *zSql!=c ){ zSql++; }
|
|
if( *zSql==0 ) return 0;
|
|
token = tkOTHER;
|
|
break;
|
|
}
|
|
default: {
|
|
if( isIdChar[(u8)*zSql] ){
|
|
/* Keywords and unquoted identifiers */
|
|
int nId;
|
|
for(nId=1; isIdChar[(u8)zSql[nId]]; nId++){}
|
|
switch( *zSql ){
|
|
case 'c': case 'C': {
|
|
if( nId==6 && sqliteStrNICmp(zSql, "create", 6)==0 ){
|
|
token = tkCREATE;
|
|
}else{
|
|
token = tkOTHER;
|
|
}
|
|
break;
|
|
}
|
|
case 't': case 'T': {
|
|
if( nId==7 && sqliteStrNICmp(zSql, "trigger", 7)==0 ){
|
|
token = tkTRIGGER;
|
|
}else if( nId==4 && sqliteStrNICmp(zSql, "temp", 4)==0 ){
|
|
token = tkTEMP;
|
|
}else if( nId==9 && sqliteStrNICmp(zSql, "temporary", 9)==0 ){
|
|
token = tkTEMP;
|
|
}else{
|
|
token = tkOTHER;
|
|
}
|
|
break;
|
|
}
|
|
case 'e': case 'E': {
|
|
if( nId==3 && sqliteStrNICmp(zSql, "end", 3)==0 ){
|
|
token = tkEND;
|
|
}else if( nId==7 && sqliteStrNICmp(zSql, "explain", 7)==0 ){
|
|
token = tkEXPLAIN;
|
|
}else{
|
|
token = tkOTHER;
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
token = tkOTHER;
|
|
break;
|
|
}
|
|
}
|
|
zSql += nId-1;
|
|
}else{
|
|
/* Operators and special symbols */
|
|
token = tkOTHER;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
state = trans[state][token];
|
|
zSql++;
|
|
}
|
|
return state==0;
|
|
}
|