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misc.go
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// Copyright 2016 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package parser
import (
"bytes"
"strings"
"github.com/pingcap/tidb/util/charset"
"github.com/pingcap/tidb/util/hack"
)
func isLetter(ch rune) bool {
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
}
func isDigit(ch rune) bool {
return (ch >= '0' && ch <= '9')
}
func isIdentChar(ch rune) bool {
return isLetter(ch) || isDigit(ch) || ch == '_' || ch == '$' || isIdentExtend(ch)
}
func isIdentExtend(ch rune) bool {
return ch >= 0x80 && ch <= '\uffff'
}
func isIdentFirstChar(ch rune) bool {
return isLetter(ch) || ch == '_'
}
func isASCII(ch rune) bool {
return ch >= 0 && ch <= 0177
}
type trieNode struct {
childs [256]*trieNode
token int
fn func(s *Scanner) (int, Pos, string)
}
var ruleTable trieNode
func initTokenByte(c byte, tok int) {
if ruleTable.childs[c] == nil {
ruleTable.childs[c] = &trieNode{}
}
ruleTable.childs[c].token = tok
}
func initTokenString(str string, tok int) {
node := &ruleTable
for _, c := range str {
if node.childs[c] == nil {
node.childs[c] = &trieNode{}
}
node = node.childs[c]
}
node.token = tok
}
func initTokenFunc(str string, fn func(s *Scanner) (int, Pos, string)) {
for i := 0; i < len(str); i++ {
c := str[i]
if ruleTable.childs[c] == nil {
ruleTable.childs[c] = &trieNode{}
}
ruleTable.childs[c].fn = fn
}
return
}
func init() {
// invalid is a special token defined in parser.y, when parser meet
// this token, it will throw an error.
// set root trie node's token to invalid, so when input match nothing
// in the trie, invalid will be the default return token.
ruleTable.token = invalid
initTokenByte('*', int('*'))
initTokenByte('/', int('/'))
initTokenByte('+', int('+'))
initTokenByte('>', int('>'))
initTokenByte('<', int('<'))
initTokenByte('(', int('('))
initTokenByte(')', int(')'))
initTokenByte(';', int(';'))
initTokenByte(',', int(','))
initTokenByte('&', int('&'))
initTokenByte('%', int('%'))
initTokenByte(':', int(':'))
initTokenByte('|', int('|'))
initTokenByte('!', int('!'))
initTokenByte('^', int('^'))
initTokenByte('~', int('~'))
initTokenByte('\\', int('\\'))
initTokenByte('?', placeholder)
initTokenByte('=', eq)
initTokenString("||", oror)
initTokenString("&&", andand)
initTokenString("&^", andnot)
initTokenString(":=", assignmentEq)
initTokenString("<=>", nulleq)
initTokenString(">=", ge)
initTokenString("<=", le)
initTokenString("!=", neq)
initTokenString("<>", neqSynonym)
initTokenString("<<", lsh)
initTokenString(">>", rsh)
initTokenFunc("@", startWithAt)
initTokenFunc("/", startWithSlash)
initTokenFunc("-", startWithDash)
initTokenFunc("#", startWithSharp)
initTokenFunc("Xx", startWithXx)
initTokenFunc("x", startWithXx)
initTokenFunc("b", startWithb)
initTokenFunc(".", startWithDot)
initTokenFunc("_$ABCDEFGHIJKLMNOPQRSTUVWYZacdefghijklmnopqrstuvwyz", scanIdentifier)
initTokenFunc("`", scanQuotedIdent)
initTokenFunc("0123456789", startWithNumber)
initTokenFunc("'\"", startString)
}
var tokenMap = map[string]int{
"ABS": abs,
"ACOS": acos,
"ADD": add,
"ADDDATE": addDate,
"ADDTIME": addTime,
"ADMIN": admin,
"AES_DECRYPT": aesDecrypt,
"AES_ENCRYPT": aesEncrypt,
"AFTER": after,
"ALL": all,
"ALTER": alter,
"ANALYZE": analyze,
"AND": and,
"ANY": any,
"AS": as,
"ASC": asc,
"ASIN": asin,
"ASCII": ascii,
"ATAN": atan,
"ATAN2": atan2,
"AUTO_INCREMENT": autoIncrement,
"AVG": avg,
"AVG_ROW_LENGTH": avgRowLength,
"BEGIN": begin,
"BETWEEN": between,
"BIN": bin,
"BINLOG": binlog,
"BOTH": both,
"BTREE": btree,
"BY": by,
"BYTE": byteType,
"CASE": caseKwd,
"CAST": cast,
"CEIL": ceil,
"CEILING": ceiling,
"CHANGE": change,
"CHARACTER": character,
"CHARSET": charsetKwd,
"CHECK": check,
"CHECKSUM": checksum,
"COALESCE": coalesce,
"COLLATE": collate,
"COLLATION": collation,
"COLUMN": column,
"COLUMNS": columns,
"COMMENT": comment,
"COMMIT": commit,
"COMMITTED": committed,
"COMPACT": compact,
"COMPRESSED": compressed,
"COMPRESSION": compression,
"CONCAT": concat,
"CONCAT_WS": concatWs,
"CONVERT_TZ": convertTz,
"CONNECTION": connection,
"CONNECTION_ID": connectionID,
"CONSTRAINT": constraint,
"CONSISTENT": consistent,
"CONVERT": convert,
"COS": cos,
"COT": cot,
"COUNT": count,
"CREATE": create,
"CROSS": cross,
"CURDATE": curDate,
"UTC_DATE": utcDate,
"UTC_TIMESTAMP": utcTimestamp,
"CURRENT_DATE": currentDate,
"CURTIME": curTime,
"CURRENT_TIME": currentTime,
"CURRENT_USER": currentUser,
"DATA": data,
"DATABASE": database,
"DATABASES": databases,
"DATEDIFF": datediff,
"DATE_ADD": dateAdd,
"DATE_FORMAT": dateFormat,
"DATE_SUB": dateSub,
"DAY": day,
"DAYNAME": dayname,
"DAYOFMONTH": dayofmonth,
"DAYOFWEEK": dayofweek,
"DAYOFYEAR": dayofyear,
"DDL": ddl,
"DEALLOCATE": deallocate,
"DEGREES": degrees,
"DEFAULT": defaultKwd,
"DELAYED": delayed,
"DELAY_KEY_WRITE": delayKeyWrite,
"DELETE": deleteKwd,
"DESC": desc,
"DESCRIBE": describe,
"DISABLE": disable,
"DISTINCT": distinct,
"DIV": div,
"DO": do,
"DROP": drop,
"DUAL": dual,
"DUPLICATE": duplicate,
"DYNAMIC": dynamic,
"FROM_DAYS": fromDays,
"ELSE": elseKwd,
"ELT": elt,
"ENABLE": enable,
"ENCLOSED": enclosed,
"END": end,
"ENGINE": engine,
"ENGINES": engines,
"ENUM": enum,
"ESCAPE": escape,
"ESCAPED": escaped,
"EVENTS": events,
"EXECUTE": execute,
"EXISTS": exists,
"EXP": exp,
"EXPLAIN": explain,
"EXPORT_SET": exportSet,
"EXTRACT": extract,
"FALSE": falseKwd,
"FIELD": fieldKwd,
"FIELDS": fields,
"FIND_IN_SET": findInSet,
"FIRST": first,
"FIXED": fixed,
"FOREIGN": foreign,
"FOR": forKwd,
"FORCE": force,
"FORMAT": format,
"FOUND_ROWS": foundRows,
"FROM": from,
"FROM_BASE64": fromBase64,
"FROM_UNIXTIME": fromUnixTime,
"FULL": full,
"FULLTEXT": fulltext,
"FUNCTION": function,
"FLOOR": floor,
"FLUSH": flush,
"GET_LOCK": getLock,
"GLOBAL": global,
"GRANT": grant,
"GRANTS": grants,
"GREATEST": greatest,
"GROUP": group,
"GROUP_CONCAT": groupConcat,
"HASH": hash,
"HAVING": having,
"HIGH_PRIORITY": highPriority,
"HOUR": hour,
"HEX": hex,
"UNHEX": unhex,
"IDENTIFIED": identified,
"IGNORE": ignore,
"IF": ifKwd,
"IFNULL": ifNull,
"IN": in,
"INDEX": index,
"INDEXES": indexes,
"INFILE": infile,
"INNER": inner,
"INSERT": insert,
"INSERT_FUNC": insertFunc,
"INSTR": instr,
"INTERVAL": interval,
"INTO": into,
"IS": is,
"ISNULL": isNull,
"ISOLATION": isolation,
"JOIN": join,
"KEY": key,
"KEY_BLOCK_SIZE": keyBlockSize,
"KEYS": keys,
"LAST_INSERT_ID": lastInsertID,
"LEADING": leading,
"LEAST": least,
"LEFT": left,
"LENGTH": length,
"LESS": less,
"LEVEL": level,
"LIKE": like,
"LIMIT": limit,
"LINES": lines,
"LN": ln,
"LOAD": load,
"LOAD_FILE": loadFile,
"LOCAL": local,
"LOCATE": locate,
"LOCK": lock,
"LOG": log,
"LOG2": log2,
"LOG10": log10,
"LOWER": lower,
"LCASE": lcase,
"LOW_PRIORITY": lowPriority,
"LPAD": lpad,
"LTRIM": ltrim,
"MAKEDATE": makeDate,
"MAKETIME": makeTime,
"MAKE_SET": makeSet,
"MAX": max,
"MAXVALUE": maxValue,
"MAX_ROWS": maxRows,
"MICROSECOND": microsecond,
"MID": mid,
"MIN": min,
"MINUTE": minute,
"MIN_ROWS": minRows,
"MOD": mod,
"MODE": mode,
"MODIFY": modify,
"MONTH": month,
"MONTHNAME": monthname,
"NAMES": names,
"NATIONAL": national,
"NOT": not,
"NO_WRITE_TO_BINLOG": noWriteToBinLog,
"NULL": null,
"NULLIF": nullIf,
"OCT": oct,
"OCTET_LENGTH": octetLength,
"OFFSET": offset,
"ON": on,
"ONLY": only,
"OPTION": option,
"OR": or,
"ORD": ord,
"ORDER": order,
"OUTER": outer,
"PASSWORD": password,
"PERIOD_ADD": periodAdd,
"PERIOD_DIFF": periodDiff,
"PI": pi,
"POSITION": position,
"POW": pow,
"POWER": power,
"PREPARE": prepare,
"PRIMARY": primary,
"PRIVILEGES": privileges,
"PROCEDURE": procedure,
"PROCESSLIST": processlist,
"QUARTER": quarter,
"QUICK": quick,
"RADIANS": radians,
"QUERY": query,
"QUOTE": quote,
"RANGE": rangeKwd,
"RAND": rand,
"READ": read,
"REDUNDANT": redundant,
"REFERENCES": references,
"REGEXP": regexpKwd,
"RELEASE_LOCK": releaseLock,
"RENAME": rename,
"REPEAT": repeat,
"REPEATABLE": repeatable,
"REPLACE": replace,
"REVOKE": revoke,
"RIGHT": right,
"RLIKE": rlike,
"ROLLBACK": rollback,
"ROUND": round,
"ROW": row,
"ROW_FORMAT": rowFormat,
"RTRIM": rtrim,
"REVERSE": reverse,
"SCHEMA": schema,
"SCHEMAS": schemas,
"SEC_TO_TIME": secToTime,
"SECOND": second,
"SELECT": selectKwd,
"SERIALIZABLE": serializable,
"SESSION": session,
"SET": set,
"SHARE": share,
"SHOW": show,
"SLEEP": sleep,
"SIGN": sign,
"SIGNED": signed,
"SIN": sin,
"SNAPSHOT": snapshot,
"SOME": some,
"SPACE": space,
"SQRT": sqrt,
"START": start,
"STARTING": starting,
"STATS_PERSISTENT": statsPersistent,
"STATUS": status,
"SUBDATE": subDate,
"SUBTIME": subTime,
"STRCMP": strcmp,
"STR_TO_DATE": strToDate,
"SUBSTR": substring,
"SUBSTRING": substring,
"SUBSTRING_INDEX": substringIndex,
"SUM": sum,
"SYSDATE": sysDate,
"TIDB": tidb,
"TABLE": tableKwd,
"TABLES": tables,
"TAN": tan,
"TERMINATED": terminated,
"TIMEDIFF": timediff,
"TIME_FORMAT": timeFormat,
"TIME_TO_SEC": timeToSec,
"TIMESTAMPADD": timestampAdd,
"TIMESTAMPDIFF": timestampDiff,
"THAN": than,
"THEN": then,
"TO": to,
"TO_DAYS": toDays,
"TO_SECONDS": toSeconds,
"TRAILING": trailing,
"TRANSACTION": transaction,
"TRIGGERS": triggers,
"TRIM": trim,
"TRUE": trueKwd,
"TRUNCATE": truncate,
"UNCOMMITTED": uncommitted,
"UNKNOWN": unknown,
"UNION": union,
"UNIQUE": unique,
"UNLOCK": unlock,
"UNSIGNED": unsigned,
"UNIX_TIMESTAMP": unixTimestamp,
"UPDATE": update,
"UPPER": upper,
"UCASE": ucase,
"UTC_TIME": utcTime,
"USE": use,
"USER": user,
"USING": using,
"VALUE": value,
"VALUES": values,
"VARIABLES": variables,
"VERSION": version,
"VIEW": view,
"WARNINGS": warnings,
"WEEK": week,
"WEEKDAY": weekday,
"WEEKOFYEAR": weekofyear,
"WHEN": when,
"WHERE": where,
"WITH": with,
"WRITE": write,
"XOR": xor,
"YEARWEEK": yearweek,
"ZEROFILL": zerofill,
"SQL_CALC_FOUND_ROWS": calcFoundRows,
"SQL_CACHE": sqlCache,
"SQL_NO_CACHE": sqlNoCache,
"CURRENT_TIMESTAMP": currentTs,
"LOCALTIME": localTime,
"LOCALTIMESTAMP": localTs,
"NOW": now,
"TINY": tinyIntType,
"TINYINT": tinyIntType,
"SMALLINT": smallIntType,
"MEDIUMINT": mediumIntType,
"INT": intType,
"INTEGER": integerType,
"BIGINT": bigIntType,
"BIT": bitType,
"DECIMAL": decimalType,
"NUMERIC": numericType,
"FLOAT": floatType,
"DOUBLE": doubleType,
"PRECISION": precisionType,
"REAL": realType,
"DATE": dateType,
"TIME": timeType,
"DATETIME": datetimeType,
"TIMESTAMP": timestampType,
"YEAR": yearType,
"CHAR": charType,
"VARCHAR": varcharType,
"BINARY": binaryType,
"VARBINARY": varbinaryType,
"TINYBLOB": tinyblobType,
"BLOB": blobType,
"MEDIUMBLOB": mediumblobType,
"LONGBLOB": longblobType,
"TINYTEXT": tinytextType,
"TEXT": textType,
"MEDIUMTEXT": mediumtextType,
"LONGTEXT": longtextType,
"BOOL": boolType,
"BOOLEAN": booleanType,
"SECOND_MICROSECOND": secondMicrosecond,
"MINUTE_MICROSECOND": minuteMicrosecond,
"MINUTE_SECOND": minuteSecond,
"HOUR_MICROSECOND": hourMicrosecond,
"HOUR_SECOND": hourSecond,
"HOUR_MINUTE": hourMinute,
"DAY_MICROSECOND": dayMicrosecond,
"DAY_SECOND": daySecond,
"DAY_MINUTE": dayMinute,
"DAY_HOUR": dayHour,
"YEAR_MONTH": yearMonth,
"RESTRICT": restrict,
"CASCADE": cascade,
"NO": no,
"ACTION": action,
"PARTITION": partition,
"PARTITIONS": partitions,
"RPAD": rpad,
"BIT_LENGTH": bitLength,
"CHAR_FUNC": charFunc,
"CHAR_LENGTH": charLength,
"CHARACTER_LENGTH": charLength,
"CONV": conv,
"BIT_XOR": bitXor,
"BENCHMARK": benchmark,
"COERCIBILITY": coercibility,
"ROW_COUNT": rowCount,
"SESSION_USER": sessionUser,
"SYSTEM_USER": systemUser,
"CRC32": crc32,
"ASYMMETRIC_DECRYPT": asymmetricDecrypt,
"ASYMMETRIC_DERIVE": asymmetricDerive,
"ASYMMETRIC_ENCRYPT": asymmetricEncrypt,
"ASYMMETRIC_SIGN": asymmetricSign,
"ASYMMETRIC_VERIFY": asymmetricVerify,
"COMPRESS": compress,
"CREATE_ASYMMETRIC_PRIV_KEY": createAsymmetricPrivKey,
"CREATE_ASYMMETRIC_PUB_KEY": createAsymmetricPubKey,
"CREATE_DH_PARAMETERS": createDHParameters,
"CREATE_DIGEST": createDigest,
"DECODE": decode,
"DES_DECRYPT": desDecrypt,
"DES_ENCRYPT": desEncrypt,
"ENCODE": encode,
"ENCRYPT": encrypt,
"MD5": md5,
"OLD_PASSWORD": oldPassword,
"RANDOM_BYTES": randomBytes,
"SHA1": sha1,
"SHA": sha,
"SHA2": sha2,
"UNCOMPRESS": uncompress,
"UNCOMPRESSED_LENGTH": uncompressedLength,
"VALIDATE_PASSWORD_STRENGTH": validatePasswordStrength,
"ANY_VALUE": anyValue,
"INET_ATON": inetAton,
"INET_NTOA": inetNtoa,
"INET6_ATON": inet6Aton,
"INET6_NTOA": inet6Ntoa,
"IS_FREE_LOCK": isFreeLock,
"IS_IPV4": isIPv4,
"IS_IPV4_COMPAT": isIPv4Compat,
"IS_IPV4_MAPPED": isIPv4Mapped,
"IS_IPV6": isIPv6,
"IS_USED_LOCK": isUsedLock,
"MASTER_POS_WAIT": masterPosWait,
"NAME_CONST": nameConst,
"RELEASE_ALL_LOCKS": releaseAllLocks,
"UUID": uuid,
"UUID_SHORT": uuidShort,
"KILL": kill,
}
func isTokenIdentifier(s string, buf *bytes.Buffer) int {
buf.Reset()
buf.Grow(len(s))
data := buf.Bytes()[:len(s)]
for i := 0; i < len(s); i++ {
if s[i] >= 'a' && s[i] <= 'z' {
data[i] = s[i] + 'A' - 'a'
} else {
data[i] = s[i]
}
}
tok := tokenMap[hack.String(data)]
return tok
}
func handleIdent(lval *yySymType) int {
s := lval.ident
// A character string literal may have an optional character set introducer and COLLATE clause:
// [_charset_name]'string' [COLLATE collation_name]
// See https://dev.mysql.com/doc/refman/5.7/en/charset-literal.html
if !strings.HasPrefix(s, "_") {
return identifier
}
cs, _, err := charset.GetCharsetInfo(s[1:])
if err != nil {
return identifier
}
lval.item = cs
return underscoreCS
}