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502 lines
18 KiB
C
502 lines
18 KiB
C
/*
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** Compile and run this standalone program in order to generate code that
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** implements a function that will translate alphabetic identifiers into
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** parser token codes.
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*/
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#include <stdio.h>
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#include <string.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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char *zTokenType; /* Token value for this keyword */
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int mask; /* Code this keyword if non-zero */
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int id; /* Unique ID for this record */
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int hash; /* Hash on the keyword */
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int offset; /* Offset to start of name string */
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int len; /* Length of this keyword, not counting final \000 */
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int prefix; /* Number of characters in prefix */
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int iNext; /* Index in aKeywordTable[] of next with same hash */
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int substrId; /* Id to another keyword this keyword is embedded in */
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int substrOffset; /* Offset into substrId for start of this keyword */
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};
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/*
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** Define masks used to determine which keywords are allowed
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*/
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#ifdef SQLITE_OMIT_ALTERTABLE
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# define ALTER 0
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#else
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# define ALTER 0x00000001
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#endif
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#define ALWAYS 0x00000002
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#ifdef SQLITE_OMIT_ANALYZE
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# define ANALYZE 0
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#else
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# define ANALYZE 0x00000004
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#endif
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#ifdef SQLITE_OMIT_ATTACH
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# define ATTACH 0
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#else
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# define ATTACH 0x00000008
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#endif
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#ifdef SQLITE_OMIT_AUTOINCREMENT
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# define AUTOINCR 0
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#else
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# define AUTOINCR 0x00000010
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#endif
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#ifdef SQLITE_OMIT_CAST
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# define CAST 0
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#else
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# define CAST 0x00000020
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#endif
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#ifdef SQLITE_OMIT_COMPOUND_SELECT
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# define COMPOUND 0
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#else
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# define COMPOUND 0x00000040
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#endif
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#ifdef SQLITE_OMIT_CONFLICT_CLAUSE
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# define CONFLICT 0
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#else
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# define CONFLICT 0x00000080
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#endif
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#ifdef SQLITE_OMIT_EXPLAIN
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# define EXPLAIN 0
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#else
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# define EXPLAIN 0x00000100
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#endif
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#ifdef SQLITE_OMIT_FOREIGN_KEY
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# define FKEY 0
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#else
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# define FKEY 0x00000200
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#endif
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#ifdef SQLITE_OMIT_PRAGMA
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# define PRAGMA 0
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#else
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# define PRAGMA 0x00000400
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#endif
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#ifdef SQLITE_OMIT_REINDEX
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# define REINDEX 0
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#else
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# define REINDEX 0x00000800
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#endif
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#ifdef SQLITE_OMIT_SUBQUERY
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# define SUBQUERY 0
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#else
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# define SUBQUERY 0x00001000
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#endif
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#ifdef SQLITE_OMIT_TRIGGER
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# define TRIGGER 0
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#else
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# define TRIGGER 0x00002000
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#endif
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#ifdef SQLITE_OMIT_VACUUM
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# define VACUUM 0
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#else
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# define VACUUM 0x00004000
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#endif
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#ifdef SQLITE_OMIT_VIEW
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# define VIEW 0
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#else
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# define VIEW 0x00008000
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#endif
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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", CONFLICT|TRIGGER },
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{ "ADD", "TK_ADD", ALTER },
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{ "AFTER", "TK_AFTER", TRIGGER },
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{ "ALL", "TK_ALL", ALWAYS },
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{ "ALTER", "TK_ALTER", ALTER },
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{ "ANALYZE", "TK_ANALYZE", ANALYZE },
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{ "AND", "TK_AND", ALWAYS },
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{ "AS", "TK_AS", ALWAYS },
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{ "ASC", "TK_ASC", ALWAYS },
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{ "ATTACH", "TK_ATTACH", ATTACH },
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{ "AUTOINCREMENT", "TK_AUTOINCR", AUTOINCR },
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{ "BEFORE", "TK_BEFORE", TRIGGER },
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{ "BEGIN", "TK_BEGIN", ALWAYS },
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{ "BETWEEN", "TK_BETWEEN", ALWAYS },
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{ "BY", "TK_BY", ALWAYS },
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{ "CASCADE", "TK_CASCADE", FKEY },
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{ "CASE", "TK_CASE", ALWAYS },
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{ "CAST", "TK_CAST", CAST },
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{ "CHECK", "TK_CHECK", ALWAYS },
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{ "COLLATE", "TK_COLLATE", ALWAYS },
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{ "COLUMN", "TK_COLUMNKW", ALTER },
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{ "COMMIT", "TK_COMMIT", ALWAYS },
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{ "CONFLICT", "TK_CONFLICT", CONFLICT },
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{ "CONSTRAINT", "TK_CONSTRAINT", ALWAYS },
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{ "CREATE", "TK_CREATE", ALWAYS },
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{ "CROSS", "TK_JOIN_KW", ALWAYS },
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{ "CURRENT_DATE", "TK_CTIME_KW", ALWAYS },
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{ "CURRENT_TIME", "TK_CTIME_KW", ALWAYS },
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{ "CURRENT_TIMESTAMP","TK_CTIME_KW", ALWAYS },
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{ "DATABASE", "TK_DATABASE", ATTACH },
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{ "DEFAULT", "TK_DEFAULT", ALWAYS },
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{ "DEFERRED", "TK_DEFERRED", ALWAYS },
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{ "DEFERRABLE", "TK_DEFERRABLE", FKEY },
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{ "DELETE", "TK_DELETE", ALWAYS },
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{ "DESC", "TK_DESC", ALWAYS },
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{ "DETACH", "TK_DETACH", ATTACH },
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{ "DISTINCT", "TK_DISTINCT", ALWAYS },
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{ "DROP", "TK_DROP", ALWAYS },
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{ "END", "TK_END", ALWAYS },
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{ "EACH", "TK_EACH", TRIGGER },
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{ "ELSE", "TK_ELSE", ALWAYS },
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{ "ESCAPE", "TK_ESCAPE", ALWAYS },
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{ "EXCEPT", "TK_EXCEPT", COMPOUND },
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{ "EXCLUSIVE", "TK_EXCLUSIVE", ALWAYS },
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{ "EXISTS", "TK_EXISTS", SUBQUERY },
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{ "EXPLAIN", "TK_EXPLAIN", EXPLAIN },
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{ "FAIL", "TK_FAIL", CONFLICT|TRIGGER },
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{ "FOR", "TK_FOR", TRIGGER },
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{ "FOREIGN", "TK_FOREIGN", FKEY },
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{ "FROM", "TK_FROM", ALWAYS },
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{ "FULL", "TK_JOIN_KW", ALWAYS },
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{ "GLOB", "TK_LIKE_KW", ALWAYS },
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{ "GROUP", "TK_GROUP", ALWAYS },
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{ "HAVING", "TK_HAVING", ALWAYS },
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{ "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER },
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{ "IMMEDIATE", "TK_IMMEDIATE", ALWAYS },
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{ "IN", "TK_IN", ALWAYS },
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{ "INDEX", "TK_INDEX", ALWAYS },
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{ "INITIALLY", "TK_INITIALLY", FKEY },
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{ "INNER", "TK_JOIN_KW", ALWAYS },
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{ "INSERT", "TK_INSERT", ALWAYS },
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{ "INSTEAD", "TK_INSTEAD", TRIGGER },
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{ "INTERSECT", "TK_INTERSECT", COMPOUND },
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{ "INTO", "TK_INTO", ALWAYS },
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{ "IS", "TK_IS", ALWAYS },
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{ "ISNULL", "TK_ISNULL", ALWAYS },
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{ "JOIN", "TK_JOIN", ALWAYS },
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{ "KEY", "TK_KEY", ALWAYS },
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{ "LEFT", "TK_JOIN_KW", ALWAYS },
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{ "LIKE", "TK_LIKE_KW", ALWAYS },
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{ "LIMIT", "TK_LIMIT", ALWAYS },
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{ "MATCH", "TK_MATCH", ALWAYS },
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{ "NATURAL", "TK_JOIN_KW", ALWAYS },
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{ "NOT", "TK_NOT", ALWAYS },
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{ "NOTNULL", "TK_NOTNULL", ALWAYS },
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{ "NULL", "TK_NULL", ALWAYS },
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{ "OF", "TK_OF", ALWAYS },
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{ "OFFSET", "TK_OFFSET", ALWAYS },
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{ "ON", "TK_ON", ALWAYS },
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{ "OR", "TK_OR", ALWAYS },
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{ "ORDER", "TK_ORDER", ALWAYS },
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{ "OUTER", "TK_JOIN_KW", ALWAYS },
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{ "PRAGMA", "TK_PRAGMA", PRAGMA },
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{ "PRIMARY", "TK_PRIMARY", ALWAYS },
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{ "RAISE", "TK_RAISE", TRIGGER },
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{ "REFERENCES", "TK_REFERENCES", FKEY },
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{ "REGEXP", "TK_LIKE_KW", ALWAYS },
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{ "REINDEX", "TK_REINDEX", REINDEX },
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{ "RENAME", "TK_RENAME", ALTER },
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{ "REPLACE", "TK_REPLACE", CONFLICT },
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{ "RESTRICT", "TK_RESTRICT", FKEY },
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{ "RIGHT", "TK_JOIN_KW", ALWAYS },
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{ "ROLLBACK", "TK_ROLLBACK", ALWAYS },
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{ "ROW", "TK_ROW", TRIGGER },
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{ "SELECT", "TK_SELECT", ALWAYS },
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{ "SET", "TK_SET", ALWAYS },
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{ "STATEMENT", "TK_STATEMENT", TRIGGER },
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{ "TABLE", "TK_TABLE", ALWAYS },
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{ "TEMP", "TK_TEMP", ALWAYS },
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{ "TEMPORARY", "TK_TEMP", ALWAYS },
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{ "THEN", "TK_THEN", ALWAYS },
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{ "TO", "TK_TO", ALTER },
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{ "TRANSACTION", "TK_TRANSACTION", ALWAYS },
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{ "TRIGGER", "TK_TRIGGER", TRIGGER },
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{ "UNION", "TK_UNION", COMPOUND },
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{ "UNIQUE", "TK_UNIQUE", ALWAYS },
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{ "UPDATE", "TK_UPDATE", ALWAYS },
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{ "USING", "TK_USING", ALWAYS },
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{ "VACUUM", "TK_VACUUM", VACUUM },
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{ "VALUES", "TK_VALUES", ALWAYS },
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{ "VIEW", "TK_VIEW", VIEW },
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{ "WHEN", "TK_WHEN", ALWAYS },
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{ "WHERE", "TK_WHERE", ALWAYS },
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};
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/* Number of keywords */
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static int NKEYWORD = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));
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/* An array to map all upper-case characters into their corresponding
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** lower-case character.
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*/
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const unsigned char sqlite3UpperToLower[] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
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18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
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36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
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54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 97, 98, 99,100,101,102,103,
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104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,
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122, 91, 92, 93, 94, 95, 96, 97, 98, 99,100,101,102,103,104,105,106,107,
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108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,
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126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
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144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,
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162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,
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180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,
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198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,
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216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,
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234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,
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252,253,254,255
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};
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#define UpperToLower sqlite3UpperToLower
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/*
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** Comparision function for two Keyword records
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*/
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static int keywordCompare1(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = pA->len - pB->len;
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if( n==0 ){
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n = strcmp(pA->zName, pB->zName);
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}
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return n;
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}
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static int keywordCompare2(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = strcmp(pA->zName, pB->zName);
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return n;
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}
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static int keywordCompare3(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = pA->offset - pB->offset;
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return n;
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}
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/*
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** Return a KeywordTable entry with the given id
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*/
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static Keyword *findById(int id){
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int i;
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for(i=0; i<NKEYWORD; i++){
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if( aKeywordTable[i].id==id ) break;
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}
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return &aKeywordTable[i];
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}
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/*
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** This routine does the work. The generated code is printed on standard
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** output.
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*/
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int main(int argc, char **argv){
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int i, j, k, h;
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int bestSize, bestCount;
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int count;
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int nChar;
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int aHash[1000]; /* 1000 is much bigger than NKEYWORD */
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/* Remove entries from the list of keywords that have mask==0 */
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for(i=j=0; i<NKEYWORD; i++){
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if( aKeywordTable[i].mask==0 ) continue;
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if( j<i ){
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aKeywordTable[j] = aKeywordTable[i];
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}
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j++;
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}
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NKEYWORD = j;
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/* Fill in the lengths of strings and hashes for all entries. */
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for(i=0; i<NKEYWORD; i++){
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Keyword *p = &aKeywordTable[i];
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p->len = strlen(p->zName);
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p->hash = (UpperToLower[p->zName[0]]*4) ^
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(UpperToLower[p->zName[p->len-1]]*3) ^ p->len;
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p->id = i+1;
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}
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/* Sort the table from shortest to longest keyword */
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qsort(aKeywordTable, NKEYWORD, sizeof(aKeywordTable[0]), keywordCompare1);
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/* Look for short keywords embedded in longer keywords */
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for(i=NKEYWORD-2; i>=0; i--){
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Keyword *p = &aKeywordTable[i];
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for(j=NKEYWORD-1; j>i && p->substrId==0; j--){
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Keyword *pOther = &aKeywordTable[j];
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if( pOther->substrId ) continue;
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if( pOther->len<=p->len ) continue;
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for(k=0; k<=pOther->len-p->len; k++){
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if( memcmp(p->zName, &pOther->zName[k], p->len)==0 ){
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p->substrId = pOther->id;
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p->substrOffset = k;
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break;
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}
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}
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}
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}
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/* Sort the table into alphabetical order */
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qsort(aKeywordTable, NKEYWORD, sizeof(aKeywordTable[0]), keywordCompare2);
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/* Fill in the offset for all entries */
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nChar = 0;
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for(i=0; i<NKEYWORD; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->offset>0 || p->substrId ) continue;
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p->offset = nChar;
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nChar += p->len;
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for(k=p->len-1; k>=1; k--){
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for(j=i+1; j<NKEYWORD; j++){
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Keyword *pOther = &aKeywordTable[j];
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if( pOther->offset>0 || pOther->substrId ) continue;
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if( pOther->len<=k ) continue;
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if( memcmp(&p->zName[p->len-k], pOther->zName, k)==0 ){
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p = pOther;
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p->offset = nChar - k;
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nChar = p->offset + p->len;
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p->zName += k;
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p->len -= k;
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p->prefix = k;
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j = i;
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k = p->len;
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}
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}
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}
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}
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for(i=0; i<NKEYWORD; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->substrId ){
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p->offset = findById(p->substrId)->offset + p->substrOffset;
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}
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}
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/* Sort the table by offset */
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qsort(aKeywordTable, NKEYWORD, sizeof(aKeywordTable[0]), keywordCompare3);
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/* Figure out how big to make the hash table in order to minimize the
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** number of collisions */
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bestSize = NKEYWORD;
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bestCount = NKEYWORD*NKEYWORD;
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for(i=NKEYWORD/2; i<=2*NKEYWORD; i++){
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for(j=0; j<i; j++) aHash[j] = 0;
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for(j=0; j<NKEYWORD; j++){
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h = aKeywordTable[j].hash % i;
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aHash[h] *= 2;
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aHash[h]++;
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}
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for(j=count=0; j<i; j++) count += aHash[j];
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if( count<bestCount ){
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bestCount = count;
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bestSize = i;
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}
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}
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/* Compute the hash */
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for(i=0; i<bestSize; i++) aHash[i] = 0;
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for(i=0; i<NKEYWORD; i++){
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h = aKeywordTable[i].hash % bestSize;
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aKeywordTable[i].iNext = aHash[h];
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aHash[h] = i+1;
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}
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/* Begin generating code */
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printf("/* Hash score: %d */\n", bestCount);
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printf("static int keywordCode(const char *z, int n){\n");
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printf(" static const char zText[%d] =\n", nChar+1);
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for(i=j=0; i<NKEYWORD; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->substrId ) continue;
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if( j==0 ) printf(" \"");
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printf("%s", p->zName);
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j += p->len;
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if( j>60 ){
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printf("\"\n");
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j = 0;
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}
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}
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printf("%s;\n", j>0 ? "\"" : " ");
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printf(" static const unsigned char aHash[%d] = {\n", bestSize);
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for(i=j=0; i<bestSize; i++){
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if( j==0 ) printf(" ");
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printf(" %3d,", aHash[i]);
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j++;
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if( j>12 ){
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printf("\n");
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j = 0;
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}
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}
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printf("%s };\n", j==0 ? "" : "\n");
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printf(" static const unsigned char aNext[%d] = {\n", NKEYWORD);
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for(i=j=0; i<NKEYWORD; i++){
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if( j==0 ) printf(" ");
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printf(" %3d,", aKeywordTable[i].iNext);
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j++;
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if( j>12 ){
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printf("\n");
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j = 0;
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}
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}
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printf("%s };\n", j==0 ? "" : "\n");
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printf(" static const unsigned char aLen[%d] = {\n", NKEYWORD);
|
|
for(i=j=0; i<NKEYWORD; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aKeywordTable[i].len+aKeywordTable[i].prefix);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned short int aOffset[%d] = {\n", NKEYWORD);
|
|
for(i=j=0; i<NKEYWORD; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aKeywordTable[i].offset);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned char aCode[%d] = {\n", NKEYWORD);
|
|
for(i=j=0; i<NKEYWORD; i++){
|
|
char *zToken = aKeywordTable[i].zTokenType;
|
|
if( j==0 ) printf(" ");
|
|
printf("%s,%*s", zToken, (int)(14-strlen(zToken)), "");
|
|
j++;
|
|
if( j>=5 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" int h, i;\n");
|
|
printf(" if( n<2 ) return TK_ID;\n");
|
|
printf(" h = ((sqlite3UpperToLower[((unsigned char*)z)[0]]*4) ^\n"
|
|
" (sqlite3UpperToLower[((unsigned char*)z)[n-1]]*3) ^\n"
|
|
" n) %% %d;\n", bestSize);
|
|
printf(" for(i=((int)aHash[h])-1; i>=0; i=((int)aNext[i])-1){\n");
|
|
printf(" if( aLen[i]==n &&"
|
|
" sqlite3StrNICmp(&zText[aOffset[i]],z,n)==0 ){\n");
|
|
printf(" return aCode[i];\n");
|
|
printf(" }\n");
|
|
printf(" }\n");
|
|
printf(" return TK_ID;\n");
|
|
printf("}\n");
|
|
printf("int sqlite3KeywordCode(const char *z, int n){\n");
|
|
printf(" return keywordCode(z, n);\n");
|
|
printf("}\n");
|
|
|
|
return 0;
|
|
}
|