{ {-# LANGUAGE CPP #-} {-# OPTIONS_GHC -funbox-strict-fields #-} #if __GLASGOW_HASKELL__ >= 800 -- Alex generates code with these warnings so we'll just ignore them. {-# OPTIONS_GHC -Wno-unused-matches #-} {-# OPTIONS_GHC -Wno-unused-imports #-} #endif module Language.JavaScript.Parser.Lexer ( Token (..) , Alex , lexCont , alexError , runAlex , alexTestTokeniser ) where import Language.JavaScript.Parser.LexerUtils import Language.JavaScript.Parser.ParserMonad import Language.JavaScript.Parser.SrcLocation import Language.JavaScript.Parser.Token import qualified Data.Map as Map } -- %wrapper "basic" -- %wrapper "monad" %wrapper "monadUserState" -- %wrapper "monad-bytestring" -- character sets $lf = \n -- line feed $cr = \r -- carriage return $ht = \t -- horizontal tab $sq = ' -- single quote $dq = \" -- double quote $digit = 0-9 -- digits $oct_digit = [0-7] $hex_digit = [0-9a-fA-F] $alpha = [a-zA-Z] -- alphabetic characters $non_zero_digit = 1-9 $ident_letter = [a-zA-Z_] @eol_pattern = $lf | $cr $lf | $cr $lf $ls = \x2028 $ps = \x2029 @LineTerminatorSequence = $lf | $cr | $ls | $ps | $cr $lf $any_char = [\x00-\xff] $any_unicode_char = [\x00-\x10ffff] $eol_char = [\x000A\x000D\x2028\x2029] -- any end of line character -- $eol_char = [$lf $cr] -- any end of line character $not_eol_char = ~$eol_char -- anything but an end of line character -- From GOLD Parser -- {ID Head} = {Letter} + [_] + [$] @IDHead = $alpha | [_] | [\$] -- {ID Tail} = {Alphanumeric} + [_] + [$] @IDTail = $alpha | $digit | [_] | [\$] -- {String Chars1} = {Printable} + {HT} - ["\] -- {String Chars2} = {Printable} + {HT} - [\''] -- $StringCharsDoubleQuote = [$printable $ht] # [$dq \\] -- $StringCharsSingleQuote = [$printable $ht] # [$sq \\] $string_chars = [^ \n \r ' \" \\] -- See e.g. http://es5.github.io/x7.html#x7.8.4 (Table 4) @sq_escapes = \\ ( \\ | ' | \" | \s | \- | b | f | n | r | t | v | 0 | x ) @dq_escapes = \\ ( \\ | ' | \" | \s | \- | b | f | n | r | t | v | 0 | x ) @unicode_escape = \\ u $hex_digit{4} @string_parts = $string_chars | \\ $digit | $ls | $ps @non_escape_char = \\ [^ \n \\ ] @stringCharsSingleQuote = @string_parts | @sq_escapes | @unicode_escape | $dq | @non_escape_char @stringCharsDoubleQuote = @string_parts | @dq_escapes | @unicode_escape | $sq | @non_escape_char -- Character values < 0x20. $low_unprintable = [\x00-\x1f] -- LineContinuation :: \ LineTerminatorSequence @LineContinuation = [\\] @LineTerminatorSequence -- {RegExp Chars} = {Letter}+{Digit}+['^']+['$']+['*']+['+']+['?']+['{']+['}']+['|']+['-']+['.']+[',']+['#']+['[']+[']']+['_']+['<']+['>'] -- $RegExpChars = [$alpha $digit \^\$\*\+\?\{\}\|\-\.\,\#\[\]\_\<\>] -- $RegExpChars = [$printable] # [\\] -- {Non Terminator} = {String Chars1} - {CR} - {LF} -- $NonTerminator = $StringCharsDoubleQuote # [$cr $lf] $regNonTerminator = [$printable] # [$cr $lf] $reg_char_class_chars = [^ $cr $lf \[ \] ] @reg_char_class_escapes = \\ ( \[ | \] ) @regCharClass = \[ ($reg_char_class_chars | @reg_char_class_escapes)* \] -- ~ (LineTerminator | MUL | BSLASH | DIV) $RegExpFirstChar = [$printable] # [ $cr $lf \* \\ \/] -- ~ ( LineTerminator | BSLASH | DIV ) $RegExpChars = [$printable] # [ $cr $lf \\ \/] $MultiLineNotAsteriskChar = [$any_unicode_char] # [\*] $MultiLineNotForwardSlashOrAsteriskChar = [$any_unicode_char] # [\* \/] -- See http://blog.stevenlevithan.com/archives/javascript-regex-and-unicode -- * \u0009 — Tab — \t -- * \u000a — Line feed — \n — (newline character) -- * \u000b — Vertical tab — \v -- * \u000c — Form feed — \f -- * \u000d — Carriage return — \r — (newline character) -- * \u0020 — Space -- * \u00a0 — No-break space -- * \u1680 — Ogham space mark -- * \u180e — Mongolian vowel separator -- * \u2000 — En quad -- * \u2001 — Em quad -- * \u2002 — En space -- * \u2003 — Em space -- * \u2004 — Three-per-em space -- * \u2005 — Four-per-em space -- * \u2006 — Six-per-em space -- * \u2007 — Figure space -- * \u2008 — Punctuation space -- * \u2009 — Thin space -- * \u200a — Hair space -- * \u2028 — Line separator — (newline character) -- * \u2029 — Paragraph separator — (newline character) -- * \u202f — Narrow no-break space -- * \u205f — Medium mathematical space -- * \u3000 — Ideographic space -- Note: from edition 5 the BOM (\xfeff) is also considered whitespace $white_char = [\x0009\x000a\x000b\x000c\x000d\x0020\x00a0\x1680\x180e\x2000\x2001\x2002\x2003\x2004\x2005\x2006\x2007\x2008\x2009\x200a\x2028\x2029\x202f\x205f\x3000\xfeff] -- Identifier characters -- UnicodeLetter -- any character in the Unicode categories “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, -- “Titlecase letter (Lt)”, “Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)”. -- http://www.fileformat.info/info/unicode/category/Lu/list.htm etc, see unicode/doit.sh $UnicodeLetter = 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-- UnicodeCombiningMark -- any character in the Unicode categories “Non-spacing mark (Mn)” or “Combining spacing mark (Mc)” $UnicodeCombiningMark = 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-- UnicodeDigit -- any character in the Unicode category “Decimal number (Nd)” $UnicodeDigit = [\x30-\x39\x660-\x669\x6f0-\x6f9\x7c0-\x7c9\x966-\x96f\x9e6-\x9ef\xa66-\xa6f\xae6-\xaef\xb66-\xb6f\xbe6-\xbef\xc66-\xc6f\xce6-\xcef\xd66-\xd6f\xe50-\xe59\xed0-\xed9\xf20-\xf29\x1040-\x1049\x104a0-\x104a9\x1090-\x1099\x11066-\x1106f\x17e0-\x17e9\x1810-\x1819\x1946-\x194f\x19d0-\x19d9\x1a80-\x1a89\x1a90-\x1a99\x1b50-\x1b59\x1bb0-\x1bb9\x1c40-\x1c49\x1c50-\x1c59\x1d7ce-\x1d7ff\xa620-\xa629\xa8d0-\xa8d9\xa900-\xa909\xa9d0-\xa9d9\xaa50-\xaa59\xabf0-\xabf9] -- UnicodeConnectorPunctuation -- any character in the Unicode category “Connector punctuation (Pc)” $UnicodeConnectorPunctuation = [\x5f-\x5f\x203f-\x2040\x2054-\x2054\xfe33-\xfe34\xfe4d-\xfe4f] -- UnicodeEscapeSequence :: -- u HexDigit HexDigit HexDigit HexDigit $HexDigit = [0-9a-fA-F] @UnicodeEscapeSequence = u $HexDigit $HexDigit $HexDigit $HexDigit -- IdentifierStart :: -- UnicodeLetter -- $ -- _ -- \ UnicodeEscapeSequence @IdentifierStart = $UnicodeLetter | [\$] | [_] | [\\] @UnicodeEscapeSequence -- IdentifierPart :: -- IdentifierStart -- UnicodeCombiningMark -- UnicodeDigit -- UnicodeConnectorPunctuation -- \ UnicodeEscapeSequence $ZWNJ = [\x200c] $ZWJ = [\x200d] @IdentifierPart = @IdentifierStart | $UnicodeCombiningMark | $UnicodeDigit | UnicodeConnectorPunctuation [\\] @UnicodeEscapeSequence | $ZWNJ | $ZWJ -- ! ------------------------------------------------- Terminals tokens :- -- State: 0 is regex allowed, 1 is / or /= allowed <0> () ; -- { registerStates lexToken reg divide } -- Skip Whitespace $white_char+ { adapt (mkString wsToken) } -- Skip one line comment "//"($not_eol_char)* { adapt (mkString commentToken) } -- --------------------------------------------------------------------- -- Comment definition from the ECMAScript spec, ver 3 -- MultiLineComment :: -- /* MultiLineCommentChars(opt) */ -- MultiLineCommentChars :: -- MultiLineNotAsteriskChar MultiLineCommentChars(opt) -- * PostAsteriskCommentChars(opt) -- PostAsteriskCommentChars :: -- MultiLineNotForwardSlashOrAsteriskChar MultiLineCommentChars(opt) -- * PostAsteriskCommentChars(opt) -- MultiLineNotAsteriskChar :: -- SourceCharacter but not asterisk * -- MultiLineNotForwardSlashOrAsteriskChar :: -- SourceCharacter but not forward-slash / or asterisk * -- Skip multi-line comments. Note: may not nest -- "/*"($any_char)*"*/" ; -- "/*" (($MultiLineNotAsteriskChar)*| ("*")+ ($MultiLineNotForwardSlashOrAsteriskChar) )* ("*")+ "/" ; "/*" (($MultiLineNotAsteriskChar)*| ("*")+ ($MultiLineNotForwardSlashOrAsteriskChar) )* ("*")+ "/" { adapt (mkString commentToken) } -- Identifier = {ID Head}{ID Tail}* -- @IDHead(@IDTail)* { \loc len str -> keywordOrIdent (take len str) loc } @IdentifierStart(@IdentifierPart)* { \ap@(loc,_,_,str) len -> keywordOrIdent (take len str) (toTokenPosn loc) } -- ECMA-262 : Section 7.8.4 String Literals -- StringLiteral = '"' ( {String Chars1} | '\' {Printable} )* '"' -- | '' ( {String Chars2} | '\' {Printable} )* '' $dq (@stringCharsDoubleQuote *) $dq | $sq (@stringCharsSingleQuote *) $sq { adapt (mkString stringToken) } -- HexIntegerLiteral = '0x' {Hex Digit}+ ("0x"|"0X") $hex_digit+ { adapt (mkString hexIntegerToken) } -- OctalLiteral = '0' {Octal Digit}+ ("0") $oct_digit+ { adapt (mkString octalToken) } -- RegExp = '/' ({RegExp Chars} | '\' {Non Terminator})+ '/' ( 'g' | 'i' | 'm' )* "/" ("\" $regNonTerminator | @regCharClass | $RegExpFirstChar) ("\" $regNonTerminator | @regCharClass | $RegExpChars)* "/" ("g"|"i"|"m")* { adapt (mkString regExToken) } -- TODO: Work in SignedInteger -- DecimalLiteral= {Non Zero Digits}+ '.' {Digit}* ('e' | 'E' ) {Non Zero Digits}+ {Digit}* -- | {Non Zero Digits}+ '.' {Digit}* -- | '0' '.' {Digit}+ ('e' | 'E' ) {Non Zero Digits}+ {Digit}* -- | {Non Zero Digits}+ {Digit}* -- | '0' -- | '0' '.' {Digit}+ -- $non_zero_digit $digit* "." $digit* ("e"|"E") ("+"|"-")? $non_zero_digit+ $digit* -- | $non_zero_digit $digit* "." $digit* -- | "0." $digit+ ("e"|"E") ("+"|"-")? $non_zero_digit+ $digit* -- | $non_zero_digit+ $digit* -- | "0" -- | "0." $digit+ { mkString decimalToken } "0" "." $digit* ("e"|"E") ("+"|"-")? $digit+ | $non_zero_digit $digit* "." $digit* ("e"|"E") ("+"|"-")? $digit+ | "." $digit+ ("e"|"E") ("+"|"-")? $digit+ | "0" ("e"|"E") ("+"|"-")? $digit+ | $non_zero_digit $digit* ("e"|"E") ("+"|"-")? $digit+ -- ++FOO++ | "0" "." $digit* | $non_zero_digit $digit* "." $digit* | "." $digit+ | "0" | $non_zero_digit $digit* { adapt (mkString decimalToken) } -- beginning of file { @eol_pattern ; -- @eol_pattern { endOfLine lexToken } -- @eol_pattern { endOfLine alexMonadScan } } -- / or /= only allowed in state 1 { "/=" { adapt (symbolToken DivideAssignToken) } "/" { adapt (symbolToken DivToken) } } { ";" { adapt (symbolToken SemiColonToken) } "," { adapt (symbolToken CommaToken) } "?" { adapt (symbolToken HookToken) } ":" { adapt (symbolToken ColonToken) } "||" { adapt (symbolToken OrToken) } "&&" { adapt (symbolToken AndToken) } "|" { adapt (symbolToken BitwiseOrToken) } "^" { adapt (symbolToken BitwiseXorToken) } "&" { adapt (symbolToken BitwiseAndToken) } "=>" { adapt (symbolToken ArrowToken) } "===" { adapt (symbolToken StrictEqToken) } "==" { adapt (symbolToken EqToken) } "*=" { adapt (symbolToken TimesAssignToken) } "%=" { adapt (symbolToken ModAssignToken) } "+=" { adapt (symbolToken PlusAssignToken) } "-=" { adapt (symbolToken MinusAssignToken) } "<<=" { adapt (symbolToken LshAssignToken) } ">>=" { adapt (symbolToken RshAssignToken) } ">>>=" { adapt (symbolToken UrshAssignToken) } "&=" { adapt (symbolToken AndAssignToken) } "^=" { adapt (symbolToken XorAssignToken) } "|=" { adapt (symbolToken OrAssignToken) } "=" { adapt (symbolToken SimpleAssignToken) } "!==" { adapt (symbolToken StrictNeToken) } "!=" { adapt (symbolToken NeToken) } "<<" { adapt (symbolToken LshToken) } "<=" { adapt (symbolToken LeToken) } "<" { adapt (symbolToken LtToken) } ">>>" { adapt (symbolToken UrshToken) } ">>" { adapt (symbolToken RshToken) } ">=" { adapt (symbolToken GeToken) } ">" { adapt (symbolToken GtToken) } "++" { adapt (symbolToken IncrementToken) } "--" { adapt (symbolToken DecrementToken) } "+" { adapt (symbolToken PlusToken) } "-" { adapt (symbolToken MinusToken) } "*" { adapt (symbolToken MulToken) } "%" { adapt (symbolToken ModToken) } "!" { adapt (symbolToken NotToken) } "~" { adapt (symbolToken BitwiseNotToken) } "..." { adapt (symbolToken SpreadToken) } "." { adapt (symbolToken DotToken) } "[" { adapt (symbolToken LeftBracketToken) } "]" { adapt (symbolToken RightBracketToken) } "{" { adapt (symbolToken LeftCurlyToken) } "}" { adapt (symbolToken RightCurlyToken) } "(" { adapt (symbolToken LeftParenToken) } ")" { adapt (symbolToken RightParenToken) } } { {- -- The next function select between the two lex input states, as called for in -- secion 7 of ECMAScript Language Specification, Edition 3, 24 March 2000. The method is inspired by the lexer in http://jint.codeplex.com/ -} classifyToken :: Token -> Int classifyToken aToken = case aToken of IdentifierToken {} -> divide NullToken {} -> divide TrueToken {} -> divide FalseToken {} -> divide ThisToken {} -> divide OctalToken {} -> divide DecimalToken {} -> divide HexIntegerToken {} -> divide StringToken {} -> divide RightCurlyToken {} -> divide RightParenToken {} -> divide RightBracketToken {} -> divide _other -> reg lexToken :: Alex Token lexToken = do inp <- alexGetInput lt <- getLastToken case lt of TailToken {} -> alexEOF _other -> case alexScan inp (classifyToken lt) of AlexEOF -> do tok <- tailToken setLastToken tok return tok AlexError (pos,_,_,_) -> alexError ("lexical error @ line " ++ show (getLineNum(pos)) ++ " and column " ++ show (getColumnNum(pos))) AlexSkip inp' _len -> do alexSetInput inp' lexToken AlexToken inp' len action -> do alexSetInput inp' tok <- action inp len setLastToken tok return tok -- For tesing. alexTestTokeniser :: String -> Either String [Token] alexTestTokeniser input = runAlex input $ loop [] where loop acc = do tok <- lexToken case tok of EOFToken {} -> return $ case acc of [] -> [] (TailToken{}:xs) -> reverse xs xs -> reverse xs _ -> loop (tok:acc) -- This is called by the Happy parser. lexCont :: (Token -> Alex a) -> Alex a lexCont cont = lexLoop where lexLoop = do tok <- lexToken case tok of CommentToken {} -> do addComment tok lexLoop WsToken {} -> do addComment tok ltok <- getLastToken case ltok of BreakToken {} -> maybeAutoSemi tok ContinueToken {} -> maybeAutoSemi tok ReturnToken {} -> maybeAutoSemi tok _otherwise -> lexLoop _other -> do cs <- getComment let tok' = tok{ tokenComment=(toCommentAnnotation cs) } setComment [] cont tok' -- If the token is a WsToken and it contains a newline, convert it to an -- AutoSemiToken and call the continuation, otherwise, just lexLoop. maybeAutoSemi (WsToken sp tl cmt) = if any (== '\n') tl then cont $ AutoSemiToken sp tl cmt else lexLoop maybeAutoSemi _ = lexLoop toCommentAnnotation :: [Token] -> [CommentAnnotation] toCommentAnnotation [] = [] toCommentAnnotation xs = reverse $ map go xs where go tok@(CommentToken {}) = (CommentA (tokenSpan tok) (tokenLiteral tok)) go tok@(WsToken {}) = (WhiteSpace (tokenSpan tok) (tokenLiteral tok)) go _ = error "toCommentAnnotation" -- --------------------------------------------------------------------- getLineNum :: AlexPosn -> Int getLineNum (AlexPn _offset lineNum _colNum) = lineNum getColumnNum :: AlexPosn -> Int getColumnNum (AlexPn _offset _lineNum colNum) = colNum -- --------------------------------------------------------------------- getLastToken :: Alex Token getLastToken = Alex $ \s@AlexState{alex_ust=ust} -> Right (s, previousToken ust) setLastToken :: Token -> Alex () setLastToken (WsToken {}) = Alex $ \s -> Right (s, ()) setLastToken tok = Alex $ \s -> Right (s{alex_ust=(alex_ust s){previousToken=tok}}, ()) getComment :: Alex [Token] getComment = Alex $ \s@AlexState{alex_ust=ust} -> Right (s, comment ust) addComment :: Token -> Alex () addComment c = Alex $ \s -> Right (s{alex_ust=(alex_ust s){comment=c:( comment (alex_ust s) )}}, ()) setComment :: [Token] -> Alex () setComment cs = Alex $ \s -> Right (s{alex_ust=(alex_ust s){comment=cs }}, ()) alexEOF :: Alex Token alexEOF = return (EOFToken tokenPosnEmpty []) tailToken :: Alex Token tailToken = return (TailToken tokenPosnEmpty []) adapt :: (TokenPosn -> Int -> String -> Alex Token) -> AlexInput -> Int -> Alex Token adapt f ((AlexPn offset line col),_,_,inp) len = f (TokenPn offset line col) len inp toTokenPosn :: AlexPosn -> TokenPosn toTokenPosn (AlexPn offset line col) = (TokenPn offset line col) -- --------------------------------------------------------------------- -- a keyword or an identifier (the syntax overlaps) keywordOrIdent :: String -> TokenPosn -> Alex Token keywordOrIdent str location = return $ case Map.lookup str keywords of Just symbol -> symbol location str [] Nothing -> IdentifierToken location str [] -- mapping from strings to keywords keywords :: Map.Map String (TokenPosn -> String -> [CommentAnnotation] -> Token) keywords = Map.fromList keywordNames keywordNames :: [(String, TokenPosn -> String -> [CommentAnnotation] -> Token)] keywordNames = [ ( "as", AsToken ) , ( "break", BreakToken ) , ( "case", CaseToken ) , ( "catch", CatchToken ) , ( "const", ConstToken ) -- not a keyword, nominally a future reserved word, but actually in use , ( "continue", ContinueToken ) , ( "debugger", DebuggerToken ) , ( "default", DefaultToken ) , ( "delete", DeleteToken ) , ( "do", DoToken ) , ( "else", ElseToken ) , ( "enum", EnumToken ) -- not a keyword, nominally a future reserved word, but actually in use , ( "export", ExportToken ) , ( "false", FalseToken ) -- boolean literal , ( "finally", FinallyToken ) , ( "for", ForToken ) , ( "function", FunctionToken ) , ( "from", FromToken ) , ( "if", IfToken ) , ( "import", ImportToken ) , ( "in", InToken ) , ( "instanceof", InstanceofToken ) , ( "let", LetToken ) , ( "new", NewToken ) , ( "null", NullToken ) -- null literal , ( "of", OfToken ) , ( "return", ReturnToken ) , ( "switch", SwitchToken ) , ( "this", ThisToken ) , ( "throw", ThrowToken ) , ( "true", TrueToken ) , ( "try", TryToken ) , ( "typeof", TypeofToken ) , ( "var", VarToken ) , ( "void", VoidToken ) , ( "while", WhileToken ) , ( "with", WithToken ) -- TODO: no idea if these are reserved or not, but they are needed -- handled in parser, in the Identifier rule , ( "get", GetToken ) , ( "set", SetToken ) {- Come from Table 6 of ECMASCRIPT 5.1, Attributes of a Named Accessor Property Also include Enumerable Configurable Table 7 includes Value -} -- Future Reserved Words , ( "class", FutureToken ) -- ( "code", FutureToken ) **** not any more -- ( "const", FutureToken ) **** an actual token, used in productions -- enum **** an actual token, used in productions , ( "extends", FutureToken ) , ( "super", FutureToken ) -- Strict mode FutureReservedWords , ( "implements", FutureToken ) , ( "interface", FutureToken ) -- ( "mode", FutureToken ) **** not any more -- ( "of", FutureToken ) **** not any more -- ( "one", FutureToken ) **** not any more -- ( "or", FutureToken ) **** not any more , ( "package", FutureToken ) , ( "private", FutureToken ) , ( "protected", FutureToken ) , ( "public", FutureToken ) , ( "static", FutureToken ) -- ( "strict", FutureToken ) *** not any more , ( "yield", FutureToken) ] } -- -- Edition 5.1 of ECMASCRIPT -- 7.6.1.1 Keywords -- The following tokens are ECMAScript keywords and may not be used as Identifiers in ECMAScript programs. -- Syntax -- Keyword :: one of -- break -- case -- catch -- continue -- debugger -- default -- delete -- do -- else -- finally -- for -- function -- if -- in -- instanceof -- new -- return -- switch -- this -- throw -- try -- typeof -- var -- void -- while -- with -- 7.6.1.2 Future Reserved Words -- The following words are used as keywords in proposed extensions and -- are therefore reserved to allow for the possibility of future adoption -- of those extensions. -- Syntax -- FutureReservedWord :: one of -- class -- const -- enum -- export -- extends -- import -- super -- The following tokens are also considered to be FutureReservedWords -- when they occur within strict mode code (see 10.1.1). The occurrence -- of any of these tokens within strict mode code in any context where -- the occurrence of a FutureReservedWord would produce an error must -- also produce an equivalent error: -- implements -- interface -- let -- package -- private -- protected -- public -- static -- yield