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lexer.go
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888 lines (846 loc) · 17.8 KB
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package parser
import (
"strings"
"unicode"
)
// TokenType represents the type of a token.
type TokenType int
const (
TokenEOF TokenType = iota
TokenError
TokenIdent
TokenNumber
TokenString
TokenNationalString
TokenBinary
TokenStar
TokenComma
TokenDot
TokenLParen
TokenRParen
TokenLBracket
TokenRBracket
TokenSemicolon
TokenEquals
TokenLessThan
TokenGreaterThan
TokenPlus
TokenMinus
TokenSlash
TokenModulo
// Keywords
TokenSelect
TokenFrom
TokenWhere
TokenAnd
TokenOr
TokenAs
TokenOption
TokenAll
TokenDistinct
TokenPrint
TokenThrow
TokenAlter
TokenTable
TokenDrop
TokenIndex
TokenRevert
TokenWith
TokenCookie
TokenDatabase
TokenScoped
TokenCredential
TokenTop
TokenPercent
TokenTies
TokenInto
TokenGroup
TokenBy
TokenHaving
TokenOrder
TokenAsc
TokenDesc
TokenUnion
TokenExcept
TokenIntersect
TokenCross
TokenJoin
TokenInner
TokenLeft
TokenRight
TokenFull
TokenOuter
TokenOn
TokenRollup
TokenCube
TokenNotEqual
TokenLessOrEqual
TokenGreaterOrEqual
TokenNot
TokenLBrace
TokenRBrace
TokenLeftShift
TokenRightShift
TokenPipe // |
TokenDoublePipe // ||
TokenConcatEquals // ||=
TokenBitwiseAnd // &
TokenPlusEquals // +=
TokenMinusEquals // -=
TokenStarEquals // *=
TokenSlashEquals // /=
TokenModuloEquals // %=
TokenAndEquals // &=
TokenOrEquals // |=
TokenXorEquals // ^=
TokenCaret // ^
// DML Keywords
TokenInsert
TokenUpdate
TokenDelete
TokenSet
TokenValues
TokenDefault
TokenNull
TokenIs
TokenIn
TokenLike
TokenBetween
TokenEscape
TokenExec
TokenExecute
TokenOver
// DDL Keywords
TokenCreate
TokenView
TokenSchema
TokenProcedure
TokenFunction
TokenTrigger
TokenAuthorization
// Control flow keywords
TokenDeclare
TokenIf
TokenElse
TokenCase
TokenWhen
TokenThen
TokenWhile
TokenBegin
TokenEnd
TokenReturn
TokenBreak
TokenContinue
TokenGoto
TokenTry
TokenCatch
// Additional keywords
TokenCurrent
TokenOf
TokenCursor
TokenOpenRowset
TokenHoldlock
TokenNowait
TokenFast
TokenMaxdop
// Security keywords
TokenGrant
TokenRevoke
TokenDeny
TokenTo
TokenPublic
// Transaction keywords
TokenCommit
TokenRollback
TokenSave
TokenTransaction
TokenTran
TokenWork
// Additional keywords
TokenWaitfor
TokenDelay
TokenTime
TokenMaster
TokenKey
TokenEncryption
TokenPassword
TokenLabel
TokenRaiserror
TokenReadtext
TokenWritetext
TokenUpdatetext
TokenTruncate
TokenColon
TokenColonColon
TokenMove
TokenConversation
TokenGet
TokenUse
TokenKill
TokenCheckpoint
TokenReconfigure
TokenOverride
TokenShutdown
TokenSetuser
TokenLineno
TokenStatusonly
TokenNoreset
TokenSend
TokenMessage
TokenTyp
TokenReceive
TokenLogin
TokenAdd
TokenUser
TokenCaller
TokenNoRevert
TokenExternal
TokenLanguage
TokenRestore
TokenBackup
TokenFilestream
TokenReturns
TokenClose
TokenOpen
TokenSymmetric
TokenStats
TokenJob
TokenQuery
TokenNotification
TokenSubscription
TokenDecryption
TokenAsymmetric
TokenCertificate
TokenDbcc
)
// Token represents a lexical token.
type Token struct {
Type TokenType
Literal string
Pos int
}
// Lexer tokenizes T-SQL input.
type Lexer struct {
input string
pos int
readPos int
ch byte
}
// NewLexer creates a new Lexer for the given input.
func NewLexer(input string) *Lexer {
// Skip UTF-8 BOM if present
if len(input) >= 3 && input[0] == 0xEF && input[1] == 0xBB && input[2] == 0xBF {
input = input[3:]
}
l := &Lexer{input: input}
l.readChar()
return l
}
func (l *Lexer) readChar() {
if l.readPos >= len(l.input) {
l.ch = 0
} else {
l.ch = l.input[l.readPos]
}
l.pos = l.readPos
l.readPos++
}
func (l *Lexer) peekChar() byte {
if l.readPos >= len(l.input) {
return 0
}
return l.input[l.readPos]
}
// NextToken returns the next token from the input.
func (l *Lexer) NextToken() Token {
l.skipWhitespaceAndComments()
tok := Token{Pos: l.pos}
switch l.ch {
case 0:
tok.Type = TokenEOF
tok.Literal = ""
case '*':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenStarEquals
tok.Literal = "*="
l.readChar()
} else {
tok.Type = TokenStar
tok.Literal = "*"
l.readChar()
}
case ',':
tok.Type = TokenComma
tok.Literal = ","
l.readChar()
case '.':
tok.Type = TokenDot
tok.Literal = "."
l.readChar()
case '(':
tok.Type = TokenLParen
tok.Literal = "("
l.readChar()
case ')':
tok.Type = TokenRParen
tok.Literal = ")"
l.readChar()
case '[':
tok = l.readBracketedIdentifier()
case ']':
tok.Type = TokenRBracket
tok.Literal = "]"
l.readChar()
case ';':
tok.Type = TokenSemicolon
tok.Literal = ";"
l.readChar()
case ':':
if l.peekChar() == ':' {
l.readChar()
tok.Type = TokenColonColon
tok.Literal = "::"
l.readChar()
} else {
tok.Type = TokenColon
tok.Literal = ":"
l.readChar()
}
case '=':
tok.Type = TokenEquals
tok.Literal = "="
l.readChar()
case '<':
if l.peekChar() == '>' {
l.readChar()
tok.Type = TokenNotEqual
tok.Literal = "<>"
l.readChar()
} else if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenLessOrEqual
tok.Literal = "<="
l.readChar()
} else if l.peekChar() == '<' {
l.readChar()
tok.Type = TokenLeftShift
tok.Literal = "<<"
l.readChar()
} else {
tok.Type = TokenLessThan
tok.Literal = "<"
l.readChar()
}
case '>':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenGreaterOrEqual
tok.Literal = ">="
l.readChar()
} else if l.peekChar() == '>' {
l.readChar()
tok.Type = TokenRightShift
tok.Literal = ">>"
l.readChar()
} else {
tok.Type = TokenGreaterThan
tok.Literal = ">"
l.readChar()
}
case '{':
tok.Type = TokenLBrace
tok.Literal = "{"
l.readChar()
case '}':
tok.Type = TokenRBrace
tok.Literal = "}"
l.readChar()
case '+':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenPlusEquals
tok.Literal = "+="
l.readChar()
} else {
tok.Type = TokenPlus
tok.Literal = "+"
l.readChar()
}
case '-':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenMinusEquals
tok.Literal = "-="
l.readChar()
} else {
tok.Type = TokenMinus
tok.Literal = "-"
l.readChar()
}
case '/':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenSlashEquals
tok.Literal = "/="
l.readChar()
} else {
tok.Type = TokenSlash
tok.Literal = "/"
l.readChar()
}
case '%':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenModuloEquals
tok.Literal = "%="
l.readChar()
} else {
tok.Type = TokenModulo
tok.Literal = "%"
l.readChar()
}
case '|':
if l.peekChar() == '|' {
l.readChar() // consume first |
if l.peekChar() == '=' {
l.readChar() // consume second |
tok.Type = TokenConcatEquals
tok.Literal = "||="
l.readChar() // consume =
} else {
tok.Type = TokenDoublePipe
tok.Literal = "||"
l.readChar() // consume second |
}
} else if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenOrEquals
tok.Literal = "|="
l.readChar()
} else {
tok.Type = TokenPipe
tok.Literal = "|"
l.readChar()
}
case '&':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenAndEquals
tok.Literal = "&="
l.readChar()
} else {
tok.Type = TokenBitwiseAnd
tok.Literal = "&"
l.readChar()
}
case '^':
if l.peekChar() == '=' {
l.readChar()
tok.Type = TokenXorEquals
tok.Literal = "^="
l.readChar()
} else {
tok.Type = TokenCaret
tok.Literal = "^"
l.readChar()
}
case '\'':
tok = l.readString()
default:
// Handle $ only if followed by a letter (for pseudo-columns like $ROWGUID)
if l.ch == '$' && isLetter(l.peekChar()) {
tok = l.readIdentifier()
} else if isLetter(l.ch) || l.ch == '_' || l.ch == '@' || l.ch == '#' {
tok = l.readIdentifier()
} else if isDigit(l.ch) {
tok = l.readNumber()
} else {
tok.Type = TokenError
tok.Literal = string(l.ch)
l.readChar()
}
}
return tok
}
// isWhitespace checks if the current position contains whitespace.
// T-SQL treats many control characters and Unicode spaces as whitespace.
func (l *Lexer) isWhitespace() bool {
if l.ch == 0 {
return false
}
// ASCII whitespace and control characters (0x01-0x20 range, excluding 0x00)
// T-SQL treats most ASCII control characters as whitespace
if l.ch <= 0x20 {
return true
}
// Check for multi-byte UTF-8 whitespace sequences
if l.ch >= 0x80 {
// Try to decode rune at current position
r, _ := l.peekRune()
// unicode.IsSpace covers most whitespace, but T-SQL also treats
// Zero Width Space (U+200B) as whitespace
return unicode.IsSpace(r) || r == 0x200B
}
return false
}
// peekRune returns the rune at the current position without advancing.
func (l *Lexer) peekRune() (rune, int) {
if l.pos >= len(l.input) {
return 0, 0
}
// Fast path for ASCII
if l.input[l.pos] < 0x80 {
return rune(l.input[l.pos]), 1
}
// Decode UTF-8
r, size := decodeRuneAt(l.input, l.pos)
return r, size
}
// decodeRuneAt decodes a UTF-8 rune at the given position.
func decodeRuneAt(s string, pos int) (rune, int) {
if pos >= len(s) {
return 0, 0
}
b := s[pos]
if b < 0x80 {
return rune(b), 1
}
// 2-byte sequence
if b&0xE0 == 0xC0 && pos+1 < len(s) {
return rune(b&0x1F)<<6 | rune(s[pos+1]&0x3F), 2
}
// 3-byte sequence
if b&0xF0 == 0xE0 && pos+2 < len(s) {
return rune(b&0x0F)<<12 | rune(s[pos+1]&0x3F)<<6 | rune(s[pos+2]&0x3F), 3
}
// 4-byte sequence
if b&0xF8 == 0xF0 && pos+3 < len(s) {
return rune(b&0x07)<<18 | rune(s[pos+1]&0x3F)<<12 | rune(s[pos+2]&0x3F)<<6 | rune(s[pos+3]&0x3F), 4
}
return rune(b), 1
}
// skipWhitespaceChar advances past one whitespace character (which may be multi-byte).
func (l *Lexer) skipWhitespaceChar() {
if l.ch < 0x80 {
l.readChar()
return
}
// Multi-byte UTF-8: advance by rune size
_, size := l.peekRune()
for i := 0; i < size; i++ {
l.readChar()
}
}
func (l *Lexer) skipWhitespaceAndComments() {
for {
// Skip whitespace (including Unicode whitespace)
for l.ch != 0 && l.isWhitespace() {
l.skipWhitespaceChar()
}
// Skip line comments (-- ...)
if l.ch == '-' && l.peekChar() == '-' {
for l.ch != 0 && l.ch != '\n' {
l.readChar()
}
continue
}
// Skip block comments (/* ... */)
if l.ch == '/' && l.peekChar() == '*' {
l.readChar() // skip /
l.readChar() // skip *
for l.ch != 0 {
if l.ch == '*' && l.peekChar() == '/' {
l.readChar() // skip *
l.readChar() // skip /
break
}
l.readChar()
}
continue
}
break
}
}
func (l *Lexer) readIdentifier() Token {
startPos := l.pos
for isLetter(l.ch) || isDigit(l.ch) || l.ch == '_' || l.ch == '@' || l.ch == '#' || l.ch == '$' {
l.readChar()
}
literal := l.input[startPos:l.pos]
// Handle N'...' national string literals
if (literal == "N" || literal == "n") && l.ch == '\'' {
return l.readNationalString(startPos)
}
return Token{
Type: lookupKeyword(literal),
Literal: literal,
Pos: startPos,
}
}
func (l *Lexer) readBracketedIdentifier() Token {
startPos := l.pos
l.readChar() // skip opening [
for l.ch != 0 && l.ch != ']' {
l.readChar()
}
if l.ch == ']' {
l.readChar() // skip closing ]
}
return Token{
Type: TokenIdent,
Literal: l.input[startPos:l.pos],
Pos: startPos,
}
}
func (l *Lexer) readString() Token {
startPos := l.pos
l.readChar() // skip opening quote
for l.ch != 0 {
if l.ch == '\'' {
if l.peekChar() == '\'' {
// Escaped quote
l.readChar()
l.readChar()
continue
}
break
}
l.readChar()
}
if l.ch == '\'' {
l.readChar() // skip closing quote
}
return Token{
Type: TokenString,
Literal: l.input[startPos:l.pos],
Pos: startPos,
}
}
func (l *Lexer) readNationalString(startPos int) Token {
// startPos already points to 'N', now we're at the opening quote
l.readChar() // skip opening quote
for l.ch != 0 {
if l.ch == '\'' {
if l.peekChar() == '\'' {
// Escaped quote
l.readChar()
l.readChar()
continue
}
break
}
l.readChar()
}
if l.ch == '\'' {
l.readChar() // skip closing quote
}
return Token{
Type: TokenNationalString,
Literal: l.input[startPos:l.pos],
Pos: startPos,
}
}
func (l *Lexer) readNumber() Token {
startPos := l.pos
// Check for binary literal (0x...)
if l.ch == '0' && (l.peekChar() == 'x' || l.peekChar() == 'X') {
l.readChar() // consume 0
l.readChar() // consume x
for isHexDigit(l.ch) {
l.readChar()
}
return Token{
Type: TokenBinary,
Literal: l.input[startPos:l.pos],
Pos: startPos,
}
}
for isDigit(l.ch) {
l.readChar()
}
// Handle decimal point
if l.ch == '.' && isDigit(l.peekChar()) {
l.readChar()
for isDigit(l.ch) {
l.readChar()
}
}
return Token{
Type: TokenNumber,
Literal: l.input[startPos:l.pos],
Pos: startPos,
}
}
func isHexDigit(ch byte) bool {
return (ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F')
}
func isLetter(ch byte) bool {
// Only ASCII letters - don't treat UTF-8 leading bytes as letters
return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
}
func isDigit(ch byte) bool {
return ch >= '0' && ch <= '9'
}
var keywords = map[string]TokenType{
"SELECT": TokenSelect,
"FROM": TokenFrom,
"WHERE": TokenWhere,
"AND": TokenAnd,
"OR": TokenOr,
"AS": TokenAs,
"OPTION": TokenOption,
"ALL": TokenAll,
"DISTINCT": TokenDistinct,
"PRINT": TokenPrint,
"THROW": TokenThrow,
"ALTER": TokenAlter,
"TABLE": TokenTable,
"DROP": TokenDrop,
"INDEX": TokenIndex,
"REVERT": TokenRevert,
"WITH": TokenWith,
"COOKIE": TokenCookie,
"DATABASE": TokenDatabase,
"SCOPED": TokenScoped,
"CREDENTIAL": TokenCredential,
"TOP": TokenTop,
"PERCENT": TokenPercent,
"TIES": TokenTies,
"INTO": TokenInto,
"GROUP": TokenGroup,
"BY": TokenBy,
"HAVING": TokenHaving,
"ORDER": TokenOrder,
"ASC": TokenAsc,
"DESC": TokenDesc,
"UNION": TokenUnion,
"EXCEPT": TokenExcept,
"INTERSECT": TokenIntersect,
"CROSS": TokenCross,
"JOIN": TokenJoin,
"INNER": TokenInner,
"LEFT": TokenLeft,
"RIGHT": TokenRight,
"FULL": TokenFull,
"OUTER": TokenOuter,
"ON": TokenOn,
"ROLLUP": TokenRollup,
"CUBE": TokenCube,
"NOT": TokenNot,
"INSERT": TokenInsert,
"UPDATE": TokenUpdate,
"DELETE": TokenDelete,
"SET": TokenSet,
"VALUES": TokenValues,
"DEFAULT": TokenDefault,
"NULL": TokenNull,
"IS": TokenIs,
"IN": TokenIn,
"LIKE": TokenLike,
"BETWEEN": TokenBetween,
"ESCAPE": TokenEscape,
"EXEC": TokenExec,
"EXECUTE": TokenExecute,
"OVER": TokenOver,
"CREATE": TokenCreate,
"VIEW": TokenView,
"SCHEMA": TokenSchema,
"PROCEDURE": TokenProcedure,
"PROC": TokenProcedure,
"FUNCTION": TokenFunction,
"TRIGGER": TokenTrigger,
"AUTHORIZATION": TokenAuthorization,
"DECLARE": TokenDeclare,
"IF": TokenIf,
"ELSE": TokenElse,
"CASE": TokenCase,
"WHEN": TokenWhen,
"THEN": TokenThen,
"WHILE": TokenWhile,
"BEGIN": TokenBegin,
"END": TokenEnd,
"RETURN": TokenReturn,
"BREAK": TokenBreak,
"CONTINUE": TokenContinue,
"GOTO": TokenGoto,
"TRY": TokenTry,
"CATCH": TokenCatch,
"CURRENT": TokenCurrent,
"OF": TokenOf,
"CURSOR": TokenCursor,
"OPENROWSET": TokenOpenRowset,
"HOLDLOCK": TokenHoldlock,
"NOWAIT": TokenNowait,
"FAST": TokenFast,
"MAXDOP": TokenMaxdop,
"GRANT": TokenGrant,
"REVOKE": TokenRevoke,
"DENY": TokenDeny,
"TO": TokenTo,
"PUBLIC": TokenPublic,
"COMMIT": TokenCommit,
"ROLLBACK": TokenRollback,
"SAVE": TokenSave,
"TRANSACTION": TokenTransaction,
"TRAN": TokenTran,
"WORK": TokenWork,
"WAITFOR": TokenWaitfor,
"DELAY": TokenDelay,
"TIME": TokenTime,
"MASTER": TokenMaster,
"KEY": TokenKey,
"ENCRYPTION": TokenEncryption,
"PASSWORD": TokenPassword,
"RAISERROR": TokenRaiserror,
"READTEXT": TokenReadtext,
"WRITETEXT": TokenWritetext,
"UPDATETEXT": TokenUpdatetext,
"TRUNCATE": TokenTruncate,
"MOVE": TokenMove,
"CONVERSATION": TokenConversation,
"GET": TokenGet,
"USE": TokenUse,
"KILL": TokenKill,
"CHECKPOINT": TokenCheckpoint,
"RECONFIGURE": TokenReconfigure,
"OVERRIDE": TokenOverride,
"SHUTDOWN": TokenShutdown,
"SETUSER": TokenSetuser,
"LINENO": TokenLineno,
"STATUSONLY": TokenStatusonly,
"NORESET": TokenNoreset,
"SEND": TokenSend,
"MESSAGE": TokenMessage,
"TYPE": TokenTyp,
"RECEIVE": TokenReceive,
"LOGIN": TokenLogin,
"ADD": TokenAdd,
"USER": TokenUser,
"CALLER": TokenCaller,
"NOREVERT": TokenNoRevert,
"EXTERNAL": TokenExternal,
"LANGUAGE": TokenLanguage,
"RESTORE": TokenRestore,
"BACKUP": TokenBackup,
"FILESTREAM": TokenFilestream,
"RETURNS": TokenReturns,
"CLOSE": TokenClose,
"OPEN": TokenOpen,
"SYMMETRIC": TokenSymmetric,
"STATS": TokenStats,
"JOB": TokenJob,
"QUERY": TokenQuery,
"NOTIFICATION": TokenNotification,
"SUBSCRIPTION": TokenSubscription,
"DECRYPTION": TokenDecryption,
"ASYMMETRIC": TokenAsymmetric,
"CERTIFICATE": TokenCertificate,
"DBCC": TokenDbcc,
}
func lookupKeyword(ident string) TokenType {
if tok, ok := keywords[strings.ToUpper(ident)]; ok {
return tok
}
return TokenIdent
}