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Lexer.x
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Lexer.x
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{
module Language.JavaScript.Parser.Lexer
( Token(..)
, AlexPosn(..)
, 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
$alpha = [a-zA-Z] -- alphabetic characters
$digit = 0-9
$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-\xffff]
$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 ' \" \\]
@sq_escapes = \\ ( \\ | ' | r | n | x )
@dq_escapes = \\ ( \\ | \" | r | n | x )
@string_parts = $string_chars | \\ $digit | $ls | $ps
@stringCharsSingleQuote = @string_parts | @sq_escapes | $dq
@stringCharsDoubleQuote = @string_parts | @dq_escapes | $sq
-- Character values < 0x20.
$low_unprintable = [\x00-\x1f]
-- LineContinuation :: \ LineTerminatorSequence
@LineContinuation = [\\] @LineTerminatorSequence
$short_str_char = [^ \n \r ' \" \\]
-- {Hex Digit} = {Digit} + [ABCDEF] + [abcdef]
@HexDigit = $digit | [a-fA-F]
-- {Oct Digit} = {Digit} + [01234567]
@OctDigit = $digit | [0-7]
-- {RegExp Chars} = {Letter}+{Digit}+['^']+['$']+['*']+['+']+['?']+['{']+['}']+['|']+['-']+['.']+[',']+['#']+['[']+[']']+['_']+['<']+['>']
-- $RegExpChars = [$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
-- $white_char = [\ \f\v\t\r\n]
-- 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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x1d6a\x1d6a0-\x1d6a5\x1d6a8-\x1d6af\x1d6b-\x1d6b\x1d6b0-\x1d6bf\x1d6c-\x1d6c\x1d6c0-\x1d6c0\x1d6c2-\x1d6cf\x1d6d-\x1d6d\x1d6d0-\x1d6da\x1d6dc-\x1d6df\x1d6e-\x1d6e\x1d6e0-\x1d6ef\x1d6f-\x1d6f\x1d6f0-\x1d6fa\x1d6fc-\x1d6ff\x1d70-\x1d70\x1d700-\x1d70f\x1d71-\x1d71\x1d710-\x1d714\x1d716-\x1d71f\x1d72-\x1d72\x1d720-\x1d72f\x1d73-\x1d73\x1d730-\x1d734\x1d736-\x1d73f\x1d74-\x1d74\x1d740-\x1d74e\x1d75-\x1d75\x1d750-\x1d75f\x1d76-\x1d76\x1d760-\x1d76e\x1d77-\x1d77\x1d770-\x1d77f\x1d78-\x1d78\x1d780-\x1d788\x1d78a-\x1d78f\x1d79-\x1d79\x1d790-\x1d79f\x1d7a-\x1d7a\x1d7a0-\x1d7a8\x1d7aa-\x1d7af\x1d7b-\x1d7b\x1d7b0-\x1d7bf\x1d7c-\x1d7c\x1d7c0-\x1d7c2\x1d7c4-\x1d7cb\x1d7d-\x1dbf\x1e00-\x1f15\x1f18-\x1f1d\x1f20-\x1f45\x1f48-\x1f4d\x1f50-\x1f57\x1f59-\x1f59\x1f5b-\x1f5b\x1f5d-\x1f5d\x1f5f-\x1f7d\x1f80-\x1fb4\x1fb6-\x1fbc\x1fbe-\x1fbe\x1fc2-\x1fc4\x1fc6-\x1fcc\x1fd0-\x1fd3\x1fd6-\x1fdb\x1fe0-\x1fec\x1ff2-\x1ff4\x1ff6-\x1ffc\x20000-\x20000\x2071-\x2071\x207f-\x207f\x2090-\x209c\x2102-\x2102\x2107-\x2107\x210a-\x2113\x2115-\x2115\x2119-\x211d\x2124-\x2124\x2126-\x2126\x2128-\x2128\x212a-\x212d\x212f-\x2139\x213c-\x213f\x2145-\x2149\x214e-\x214e\x2160-\x2188\x2a6d6-\x2a6d6\x2a700-\x2a700\x2b734-\x2b734\x2b740-\x2b740\x2b81d-\x2b81d\x2c00-\x2c2e\x2c30-\x2c5e\x2c60-\x2ce4\x2ceb-\x2cee\x2d00-\x2d25\x2d30-\x2d65\x2d6f-\x2d6f\x2d80-\x2d96\x2da0-\x2da6\x2da8-\x2dae\x2db0-\x2db6\x2db8-\x2dbe\x2dc0-\x2dc6\x2dc8-\x2dce\x2dd0-\x2dd6\x2dd8-\x2dde\x2e2f-\x2e2f\x2f800-\x2fa1d\x3005-\x3007\x3021-\x3029\x3031-\x3035\x3038-\x303c\x3041-\x3096\x309d-\x309f\x30a1-\x30fa\x30fc-\x30ff\x3105-\x312d\x3131-\x318e\x31a0-\x31ba\x31f0-\x31ff\x3400-\x3400\x4db5-\x4db5\x4e00-\x4e00\x9fcb-\x9fcb\xa000-\xa48c\xa4d0-\xa4fd\xa500-\xa60c\xa610-\xa61f\xa62a-\xa62b\xa640-\xa66e\xa67f-\xa697\xa6a0-\xa6ef\xa717-\xa71f\xa722-\xa788\xa78b-\xa78e\xa790-\xa791\xa7a0-\xa7a9\xa7fa-\xa801\xa803-\xa805\xa807-\xa80a\xa80c-\xa822\xa840-\xa873\xa882-\xa8b3\xa8f2-\xa8f7\xa8fb-\xa8fb\xa90a-\xa925\xa930-\xa946\xa960-\xa97c\xa984-\xa9b2\xa9cf-\xa9cf\xaa00-\xaa28\xaa40-\xaa42\xaa44-\xaa4b\xaa60-\xaa76\xaa7a-\xaa7a\xaa80-\xaaaf\xaab1-\xaab1\xaab5-\xaab6\xaab9-\xaabd\xaac0-\xaac0\xaac2-\xaac2\xaadb-\xaadd\xab01-\xab06\xab09-\xab0e\xab11-\xab16\xab20-\xab26\xab28-\xab2e\xabc0-\xabe2\xac00-\xac00\xd7a3-\xd7a3\xd7b0-\xd7c6\xd7cb-\xd7fb\xf900-\xfa2d\xfa30-\xfa6d\xfa70-\xfad9\xfb00-\xfb06\xfb13-\xfb17\xfb1d-\xfb1d\xfb1f-\xfb28\xfb2a-\xfb36\xfb38-\xfb3c\xfb3e-\xfb3e\xfb40-\xfb41\xfb43-\xfb44\xfb46-\xfbb1\xfbd3-\xfd3d\xfd50-\xfd8f\xfd92-\xfdc7\xfdf0-\xfdfb\xfe70-\xfe74\xfe76-\xfefc\xff21-\xff3a\xff41-\xff5a\xff66-\xffbe\xffc2-\xffc7\xffca-\xffcf\xffd2-\xffd7]
-- UnicodeCombiningMark
-- any character in the Unicode categories “Non-spacing mark (Mn)” or “Combining spacing mark (Mc)”
$UnicodeCombiningMark = [\x300-\x36f\x483-\x487\x591-\x5bd\x5bf-\x5bf\x5c1-\x5c2\x5c4-\x5c5\x5c7-\x5c7\x610-\x61a\x64b-\x65f\x670-\x670\x6d6-\x6dc\x6df-\x6e4\x6e7-\x6e8\x6ea-\x6ed\x711-\x711\x730-\x74a\x7a6-\x7b0\x7eb-\x7f3\x816-\x819\x81b-\x823\x825-\x827\x829-\x82d\x859-\x85b\x900-\x903\x93a-\x93c\x93e-\x94f\x951-\x957\x962-\x963\x981-\x983\x9bc-\x9bc\x9be-\x9c4\x9c7-\x9c8\x9cb-\x9cd\x9d7-\x9d7\x9e2-\x9e3\xa01-\xa03\xa3c-\xa3c\xa3e-\xa42\xa47-\xa48\xa4b-\xa4d\xa51-\xa51\xa70-\xa71\xa75-\xa75\xa81-\xa83\xabc-\xabc\xabe-\xac5\xac7-\xac9\xacb-\xacd\xae2-\xae3\xb01-\xb03\xb3c-\xb3c\xb3e-\xb44\xb47-\xb48\xb4b-\xb4d\xb56-\xb57\xb62-\xb63\xb82-\xb82\xbbe-\xbc2\xbc6-\xbc8\xbca-\xbcd\xbd7-\xbd7\xc01-\xc03\xc3e-\xc44\xc46-\xc48\xc4a-\xc4d\xc55-\xc56\xc62-\xc63\xc82-\xc83\xcbc-\xcbc\xcbe-\xcc4\xcc6-\xcc8\xcca-\xccd\xcd5-\xcd6\xce2-\xce3\xd02-\xd03\xd3e-\xd44\xd46-\xd48\xd4a-\xd4d\xd57-\xd57\xd62-\xd63\xd82-\xd83\xdca-\xdca\xdcf-\xdd4\xdd6-\xdd6\xdd8-\xddf\xdf2-\xdf3\xe31-\xe31\xe34-\xe3a\xe47-\xe4e\xeb1-\xeb1\xeb4-\xeb9\xebb-\xebc\xec8-\xecd\xf18-\xf19\xf35-\xf35\xf37-\xf37\xf39-\xf39\xf3e-\xf3f\xf71-\xf84\xf86-\xf87\xf8d-\xf97\xf99-\xfbc\xfc6-\xfc6\x101fd-\x101fd\x102b-\x103e\x1056-\x1059\x105e-\x1060\x1062-\x1064\x1067-\x106d\x1071-\x1074\x1082-\x108d\x108f-\x108f\x109a-\x109d\x10a01-\x10a03\x10a05-\x10a06\x10a0c-\x10a0f\x10a38-\x10a3a\x10a3f-\x10a3f\x11000-\x11002\x11038-\x11046\x11080-\x11082\x110b0-\x110ba\x135d-\x135f\x1712-\x1714\x1732-\x1734\x1752-\x1753\x1772-\x1773\x17b6-\x17d3\x17dd-\x17dd\x180b-\x180d\x18a9-\x18a9\x1920-\x192b\x1930-\x193b\x19b0-\x19c0\x19c8-\x19c9\x1a17-\x1a1b\x1a55-\x1a5e\x1a60-\x1a7c\x1a7f-\x1a7f\x1b00-\x1b04\x1b34-\x1b44\x1b6b-\x1b73\x1b80-\x1b82\x1ba1-\x1baa\x1be6-\x1bf3\x1c24-\x1c37\x1cd0-\x1cd2\x1cd4-\x1ce8\x1ced-\x1ced\x1cf2-\x1cf2\x1d165-\x1d169\x1d16d-\x1d172\x1d17b-\x1d182\x1d185-\x1d18b\x1d1aa-\x1d1ad\x1d242-\x1d244\x1dc0-\x1de6\x1dfc-\x1dff\x20d0-\x20dc\x20e1-\x20e1\x20e5-\x20f0\x2cef-\x2cf1\x2d7f-\x2d7f\x2de0-\x2dff\x302a-\x302f\x3099-\x309a\xa66f-\xa66f\xa67c-\xa67d\xa6f0-\xa6f1\xa802-\xa802\xa806-\xa806\xa80b-\xa80b\xa823-\xa827\xa880-\xa881\xa8b4-\xa8c4\xa8e0-\xa8f1\xa926-\xa92d\xa947-\xa953\xa980-\xa983\xa9b3-\xa9c0\xaa29-\xaa36\xaa43-\xaa43\xaa4c-\xaa4d\xaa7b-\xaa7b\xaab0-\xaab0\xaab2-\xaab4\xaab7-\xaab8\xaabe-\xaabf\xaac1-\xaac1\xabe3-\xabea\xabec-\xabed\xe0100-\xe01ef\xfb1e-\xfb1e\xfe00-\xfe0f]
-- 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
<reg,divide> $white_char+ { adapt (mkString wsToken) }
-- Skip one line comment
<reg,divide> "//"($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
-- <reg,divide> "/*"($any_char)*"*/" ;
-- <reg,divide> "/*" (($MultiLineNotAsteriskChar)*| ("*")+ ($MultiLineNotForwardSlashOrAsteriskChar) )* ("*")+ "/" ;
<reg,divide> "/*" (($MultiLineNotAsteriskChar)*| ("*")+ ($MultiLineNotForwardSlashOrAsteriskChar) )* ("*")+ "/" { adapt (mkString commentToken) }
-- Identifier = {ID Head}{ID Tail}*
-- <reg,divide> @IDHead(@IDTail)* { \loc len str -> keywordOrIdent (take len str) loc }
<reg,divide> @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} )* ''
<reg,divide> $dq (@stringCharsDoubleQuote *) $dq
| $sq (@stringCharsSingleQuote *) $sq { adapt (mkString stringToken) }
-- HexIntegerLiteral = '0x' {Hex Digit}+
<reg,divide> ("0x"|"0X") @HexDigit+ { adapt (mkString hexIntegerToken) }
-- OctalLiteral = '0' {Octal Digit}+
<reg,divide> ("0") @OctDigit+ { adapt (mkString octalToken) }
-- RegExp = '/' ({RegExp Chars} | '\' {Non Terminator})+ '/' ( 'g' | 'i' | 'm' )*
-- <reg> "/" ($RegExpChars | "\" $NonTerminator)+ "/" ("g"|"i"|"m")* { mkString regExToken }
<reg> "/"
("\" $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}+
-- <reg,divide> $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 }
<reg,divide> "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
<bof> {
@eol_pattern ;
-- @eol_pattern { endOfLine lexToken }
-- @eol_pattern { endOfLine alexMonadScan }
}
-- / or /= only allowed in state 1
<divide> {
"/=" { adapt (mkString assignToken)}
"/" { adapt (symbolToken DivToken)}
}
<reg,divide> {
";" { 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 StrictEqToken)}
"==" { adapt (symbolToken EqToken)}
"*=" | "%=" | "+=" | "-=" | "<<=" | ">>=" | ">>>=" | "&=" | "^=" | "|="
{ adapt (mkString assignToken)}
"=" { 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 DotToken)}
"[" { adapt (symbolToken LeftBracketToken)}
"]" { adapt (symbolToken RightBracketToken)}
"{" { adapt (symbolToken LeftCurlyToken)}
"}" { adapt (symbolToken RightCurlyToken)}
"(" { adapt (symbolToken LeftParenToken)}
")" { adapt (symbolToken RightParenToken)}
"@*/" { adapt (symbolToken CondcommentEndToken)}
}
{
{-
-- 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 = do
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 ws@(WsToken sp tl cmt) =
if any (== '\n') tl
then cont $ AutoSemiToken sp tl cmt
else lexLoop
maybeAutoSemi _ = lexLoop
toCommentAnnotation :: [Token] -> [CommentAnnotation]
toCommentAnnotation [] = [NoComment]
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 = do return (EOFToken tokenPosnEmpty [])
tailToken :: Alex Token
tailToken = do 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 -> Token)
keywords :: Map.Map String (TokenPosn -> String -> [CommentAnnotation] -> Token)
keywords = Map.fromList keywordNames
-- keywordNames :: [(String, TokenPosn -> String -> Token)]
keywordNames :: [(String, TokenPosn -> String -> [CommentAnnotation] -> Token)]
keywordNames =
[ ( "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
, ( "false", FalseToken ) -- boolean literal
, ( "finally", FinallyToken )
, ( "for", ForToken )
, ( "function", FunctionToken )
, ( "if", IfToken )
, ( "in", InToken )
, ( "instanceof", InstanceofToken )
, ( "new", NewToken )
, ( "null", NullToken ) -- null literal
, ( "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
, ( "export", FutureToken )
, ( "extends", FutureToken )
, ( "import", FutureToken )
, ( "super", FutureToken )
-- Strict mode FutureReservedWords
, ( "implements", FutureToken )
, ( "interface", FutureToken )
, ( "let", 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
-- Set emacs mode
-- Local Variables:
-- mode:haskell
-- End: