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lex.fsl
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// Copyright (c) Microsoft Corporation. All Rights Reserved. See License.txt in the project root for license information.
{
module internal FSharp.Compiler.Lexer
//------------------------------------------------------------------------
// The Lexer. Some of the complication arises from the fact it is
// reused by the Visual Studio mode to do partial lexing reporting
// whitespace etc.
//-----------------------------------------------------------------------
open System
open System.Globalization
open System.Text
open Internal.Utilities
open Internal.Utilities.Library
open Internal.Utilities.Library.Extras
open Internal.Utilities.Text.Lexing
open FSharp.Compiler
open FSharp.Compiler.AbstractIL
open FSharp.Compiler.DiagnosticsLogger
open FSharp.Compiler.Features
open FSharp.Compiler.IO
open FSharp.Compiler.Lexhelp
open FSharp.Compiler.ParseHelpers
open FSharp.Compiler.Parser
open FSharp.Compiler.Syntax
open FSharp.Compiler.Text
open FSharp.Compiler.Text.Range
module Ranges =
/// Whether valid as signed int8 when a minus sign is prepended, compares true to 0x80
let isInt8BadMax x = 1 <<< 7 = x
/// Whether valid as signed int16 when a minus sign is prepended, compares true to 0x8000
let isInt16BadMax x = 1 <<< 15 = x
/// Whether valid as signed int32 when a minus sign is prepended, compares as string against "2147483648".
let isInt32BadMax = let max = string(1UL <<< 31) in fun s -> max = s
/// Whether valid as signed int64 when a minus sign is prepended, compares as string against "9223372036854775808".
let isInt64BadMax = let max = string(1UL <<< 63) in fun s -> max = s
/// Get string from lexbuf
let lexeme (lexbuf : UnicodeLexing.Lexbuf) = UnicodeLexing.Lexbuf.LexemeString lexbuf
/// Trim n chars from both sides of lexbuf, return string
let lexemeTrimBoth (lexbuf : UnicodeLexing.Lexbuf) (n:int) (m:int) =
let s = lexbuf.LexemeView
s.Slice(n, s.Length - (n+m)).ToString()
/// Trim n chars from the right of lexbuf, return string
let lexemeTrimRight lexbuf n = lexemeTrimBoth lexbuf 0 n
/// Trim n chars from the left of lexbuf, return string
let lexemeTrimLeft lexbuf n = lexemeTrimBoth lexbuf n 0
/// Throw a lexing error with a message
let fail args (lexbuf:UnicodeLexing.Lexbuf) msg dflt =
let m = lexbuf.LexemeRange
args.diagnosticsLogger.ErrorR(Error(msg,m))
dflt
//--------------------------
// Integer parsing
// Parsing integers is common in bootstrap runs (parsing
// the parser tables, no doubt). So this is an optimized
// version of the F# core library parsing code with the call to "Trim"
// removed, which appears in profiling runs as a small but significant cost.
let getSign32 (s:string) (p:byref<int>) l =
if (l >= p + 1 && s.[p] = '-')
then p <- p + 1; -1
else 1
let isOXB c =
let c = Char.ToLowerInvariant c
c = 'x' || c = 'o' || c = 'b'
let is0OXB (s:string) p l =
l >= p + 2 && s.[p] = '0' && isOXB s.[p+1]
let get0OXB (s:string) (p:byref<int>) l =
if is0OXB s p l
then let r = Char.ToLowerInvariant s.[p+1] in p <- p + 2; r
else 'd'
let formatError() = raise (new System.FormatException(SR.GetString("bad format string")))
let parseBinaryUInt64 (s:string) =
Convert.ToUInt64(s, 2)
let parseOctalUInt64 (s:string) =
Convert.ToUInt64(s, 8)
let removeUnderscores (s:string) =
s.Replace("_", "")
let parseInt32 (s:string) =
let s = removeUnderscores s
let l = s.Length
let mutable p = 0
let sign = getSign32 s &p l
let specifier = get0OXB s &p l
match Char.ToLower(specifier,CultureInfo.InvariantCulture) with
| 'x' -> sign * (int32 (Convert.ToUInt32(UInt64.Parse(s.Substring(p), NumberStyles.AllowHexSpecifier,CultureInfo.InvariantCulture))))
| 'b' -> sign * (int32 (Convert.ToUInt32(parseBinaryUInt64 (s.Substring(p)))))
| 'o' -> sign * (int32 (Convert.ToUInt32(parseOctalUInt64 (s.Substring(p)))))
| _ -> Int32.Parse(s, NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture)
let lexemeTrimRightToInt32 args lexbuf n =
try parseInt32 (lexemeTrimRight lexbuf n)
with _ -> fail args lexbuf (FSComp.SR.lexOutsideIntegerRange()) 0
//--------------------------
// Checks
let checkExprOp (lexbuf:UnicodeLexing.Lexbuf) =
if lexbuf.LexemeContains ':' then
deprecatedWithError (FSComp.SR.lexCharNotAllowedInOperatorNames(":")) lexbuf.LexemeRange
if lexbuf.LexemeContains '$' then
deprecatedWithError (FSComp.SR.lexCharNotAllowedInOperatorNames("$")) lexbuf.LexemeRange
let unexpectedChar lexbuf =
LEX_FAILURE (FSComp.SR.lexUnexpectedChar(lexeme lexbuf))
/// Arbitrary value
[<Literal>]
let StringCapacity = 100
let startString args (lexbuf: UnicodeLexing.Lexbuf) =
let buf = ByteBuffer.Create StringCapacity
let m = lexbuf.LexemeRange
let startp = lexbuf.StartPos
let fin =
LexerStringFinisher (fun buf kind context cont ->
// Adjust the start-of-token mark back to the true start of the token
lexbuf.StartPos <- startp
let isPart = context.HasFlag(LexerStringFinisherContext.InterpolatedPart)
let isVerbatim = context.HasFlag(LexerStringFinisherContext.Verbatim)
let isTripleQuote = context.HasFlag(LexerStringFinisherContext.TripleQuote)
if kind.IsByteString then
let synByteStringKind = if isVerbatim then SynByteStringKind.Verbatim else SynByteStringKind.Regular
if kind.IsInterpolated then
fail args lexbuf (FSComp.SR.lexByteStringMayNotBeInterpolated()) ()
BYTEARRAY (Lexhelp.stringBufferAsBytes buf, synByteStringKind, cont)
elif Lexhelp.stringBufferIsBytes buf then
BYTEARRAY (Lexhelp.stringBufferAsBytes buf, synByteStringKind, cont)
else
fail args lexbuf (FSComp.SR.lexByteArrayCannotEncode()) ()
BYTEARRAY (Lexhelp.stringBufferAsBytes buf, synByteStringKind, cont)
elif kind.IsInterpolated then
let s = Lexhelp.stringBufferAsString buf
if kind.IsInterpolatedFirst then
let synStringKind =
if isTripleQuote then
SynStringKind.TripleQuote
elif isVerbatim then
SynStringKind.Verbatim
else
SynStringKind.Regular
if isPart then
INTERP_STRING_BEGIN_PART (s, synStringKind, cont)
else
INTERP_STRING_BEGIN_END (s, synStringKind, cont)
else
if isPart then
INTERP_STRING_PART (s, cont)
else
INTERP_STRING_END (s, cont)
else
let s = Lexhelp.stringBufferAsString buf
let synStringKind =
if isVerbatim then
SynStringKind.Verbatim
elif isTripleQuote then
SynStringKind.TripleQuote
else
SynStringKind.Regular
STRING (s, synStringKind, cont))
buf,fin,m
// Utility functions for processing XML documentation
let trySaveXmlDoc (lexbuf: LexBuffer<char>) (buff: (range * StringBuilder) option) =
match buff with
| None -> ()
| Some (start, sb) ->
let xmlCommentLineRange = mkFileIndexRange start.FileIndex start.Start (posOfLexPosition lexbuf.StartPos)
LexbufLocalXmlDocStore.SaveXmlDocLine (lexbuf, sb.ToString(), xmlCommentLineRange)
let tryAppendXmlDoc (buff: (range * StringBuilder) option) (s:string) =
match buff with
| None -> ()
| Some (_, sb) -> ignore(sb.Append s)
// Utilities for parsing #if/#else/#endif
let shouldStartLine args lexbuf (m:range) err tok =
if (m.StartColumn <> 0) then fail args lexbuf err tok
else tok
let shouldStartFile args lexbuf (m:range) err tok =
if (m.StartColumn <> 0 || m.StartLine <> 1) then fail args lexbuf err tok
else tok
let evalIfDefExpression startPos reportLibraryOnlyFeatures langVersion args (lookup:string->bool) (lexed:string) =
let lexbuf = LexBuffer<char>.FromChars (reportLibraryOnlyFeatures, langVersion, lexed.ToCharArray ())
lexbuf.StartPos <- startPos
lexbuf.EndPos <- startPos
let tokenStream = FSharp.Compiler.PPLexer.tokenstream args
let expr = FSharp.Compiler.PPParser.start tokenStream lexbuf
(LexerIfdefEval lookup expr), expr
let evalFloat args lexbuf =
try
float32(removeUnderscores (lexemeTrimRight lexbuf 1))
with _ ->
fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0.0f
}
let letter = '\Lu' | '\Ll' | '\Lt' | '\Lm' | '\Lo' | '\Nl'
let surrogateChar = '\Cs'
let digit = '\Nd'
let hex = ['0'-'9'] | ['A'-'F'] | ['a'-'f']
let truewhite = [' ']
let offwhite = ['\t']
let anywhite = truewhite | offwhite
let anychar = [^'\n''\r']
let anystring = anychar*
let op_char = '!'|'$'|'%'|'&'|'*'|'+'|'-'|'.'|'/'|'<'|'='|'>'|'?'|'@'|'^'|'|'|'~'|':'
let ignored_op_char = '.' | '$' | '?'
let separator = '_'
let xinteger =
( '0' ('x'| 'X') hex ((hex | separator)* hex)?
| '0' ('o'| 'O') (['0'-'7']) (((['0'-'7']) | separator)* (['0'-'7']))?
| '0' ('b'| 'B') (['0'-'1']) (((['0'-'1']) | separator)* (['0'-'1']))?)
let integer = digit ((digit | separator)* digit)?
let int8 = integer 'y'
let uint8 = (xinteger | integer) 'u' 'y'
let int16 = integer 's'
let uint16 = (xinteger | integer) 'u' 's'
let int = integer
let int32 = integer 'l'
let uint32 = (xinteger | integer) 'u'
let uint32l = (xinteger | integer) 'u' 'l'
let nativeint = (xinteger | integer) 'n'
let unativeint = (xinteger | integer) 'u' 'n'
let int64 = (xinteger | integer) 'L'
let uint64 = (xinteger | integer) ('u' | 'U') 'L'
let xint8 = xinteger 'y'
let xint16 = xinteger 's'
let xint = xinteger
let xint32 = xinteger 'l'
let floatp = digit ((digit | separator)* digit)? '.' (digit ((digit | separator)* digit)?)?
let floate = digit ((digit | separator)* digit)? ('.' (digit ((digit | separator)* digit)?)? )? ('e'| 'E') ['+' '-']? digit ((digit | separator)* digit)?
let float = floatp | floate
let bignum = integer ('I' | 'N' | 'Z' | 'Q' | 'R' | 'G')
let ieee64 = float
let ieee32 = float ('f' | 'F')
let ieee32_dotless_no_exponent = integer ('f' | 'F')
let decimal = (float | integer) ('m' | 'M')
let xieee32 = xinteger 'l' 'f'
let xieee64 = xinteger 'L' 'F'
let escape_char = ('\\' ( '\\' | "\"" | '\'' | 'a' | 'f' | 'v' | 'n' | 't' | 'b' | 'r'))
let char = '\'' ( [^'\\''\n''\r''\t''\b'] | escape_char) '\''
let trigraph = '\\' digit digit digit
let hexGraphShort = '\\' 'x' hex hex
let unicodeGraphShort = '\\' 'u' hex hex hex hex
let unicodeGraphLong = '\\' 'U' hex hex hex hex hex hex hex hex
let newline = ('\n' | '\r' '\n')
let connecting_char = '\Pc'
let combining_char = '\Mn' | '\Mc'
let formatting_char = '\Cf'
let ident_start_char =
letter | '_'
let ident_char =
letter
| connecting_char
| combining_char
| formatting_char
| digit
| ['\'']
let ident = ident_start_char ident_char*
rule token args skip = parse
| ident
{ Keywords.KeywordOrIdentifierToken args lexbuf (lexeme lexbuf) }
| "do!"
{ DO_BANG }
| "yield!"
{ YIELD_BANG(true) }
| "return!"
{ YIELD_BANG(false) }
| "match!"
{ MATCH_BANG }
| "and!"
{ AND_BANG(false) }
| "while!"
{ WHILE_BANG }
| ident '!'
{ let tok = Keywords.KeywordOrIdentifierToken args lexbuf (lexemeTrimRight lexbuf 1)
match tok with
| LET _ -> BINDER (lexemeTrimRight lexbuf 1)
| _ -> fail args lexbuf (FSComp.SR.lexIdentEndInMarkReserved("!")) (Keywords.KeywordOrIdentifierToken args lexbuf (lexeme lexbuf)) }
| ident ('#')
{ fail args lexbuf (FSComp.SR.lexIdentEndInMarkReserved("#")) (Keywords.KeywordOrIdentifierToken args lexbuf (lexeme lexbuf)) }
| int8
{ let n = lexemeTrimRightToInt32 args lexbuf 1
// Allow <max_int+1> to parse as min_int. Allowed only because we parse '-' as an operator.
if Ranges.isInt8BadMax n then INT8(SByte.MinValue, true (* 'true' = 'bad'*) )
else if n > int SByte.MaxValue || n < int SByte.MinValue then fail args lexbuf (FSComp.SR.lexOutsideEightBitSigned()) (INT8(0y, false))
else INT8(sbyte n, false) }
| xint8
{ let n = lexemeTrimRightToInt32 args lexbuf 1
if n > int Byte.MaxValue || n < 0 then fail args lexbuf (FSComp.SR.lexOutsideEightBitSignedHex()) (INT8(0y, false))
else INT8(sbyte(byte(n)), false) }
| uint8
{ let n = lexemeTrimRightToInt32 args lexbuf 2
if n > int Byte.MaxValue || n < 0 then fail args lexbuf (FSComp.SR.lexOutsideEightBitUnsigned()) (UINT8(0uy))
else UINT8(byte n) }
| int16
{ let n = lexemeTrimRightToInt32 args lexbuf 1
// Allow <max_int+1> to parse as min_int. Allowed only because we parse '-' as an operator.
if Ranges.isInt16BadMax n then INT16(Int16.MinValue, true (* 'true' = 'bad'*) )
else if n > int Int16.MaxValue || n < int Int16.MinValue then fail args lexbuf (FSComp.SR.lexOutsideSixteenBitSigned()) (INT16(0s, false))
else INT16(int16 n, false) }
| xint16
{ let n = lexemeTrimRightToInt32 args lexbuf 1
if n > int UInt16.MaxValue || n < 0 then fail args lexbuf (FSComp.SR.lexOutsideSixteenBitSigned()) (INT16(0s,false))
else INT16(int16(uint16(n)), false) }
| uint16
{ let n = lexemeTrimRightToInt32 args lexbuf 2
if n > int UInt16.MaxValue || n < 0 then fail args lexbuf (FSComp.SR.lexOutsideSixteenBitUnsigned()) (UINT16(0us))
else UINT16(uint16 n) }
| int '.' '.'
{ let s = removeUnderscores (lexemeTrimRight lexbuf 2)
// Allow <max_int+1> to parse as min_int. Allowed only because we parse '-' as an operator.
if Ranges.isInt32BadMax s then INT32_DOT_DOT(Int32.MinValue, true (* 'true' = 'bad'*) ) else
let n = try int32 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitSigned()) 0
INT32_DOT_DOT(n, false)
}
| xint
| int
{ let s = removeUnderscores (lexeme lexbuf)
// Allow <max_int+1> to parse as min_int. Allowed only because we parse '-' as an operator.
if Ranges.isInt32BadMax s then INT32(Int32.MinValue, true (* 'true' = 'bad'*) ) else
let n =
try int32 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitSigned()) 0
INT32(n, false)
}
| xint32
| int32
{ let s = removeUnderscores (lexemeTrimRight lexbuf 1)
// Allow <max_int+1> to parse as min_int. Allowed only because we parse '-' as an operator.
if Ranges.isInt32BadMax s then INT32(Int32.MinValue, true (* 'true' = 'bad'*) ) else
let n =
try int32 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitSigned()) 0
INT32(n, false)
}
| uint32
{
let s = removeUnderscores (lexemeTrimRight lexbuf 1)
let n =
try int64 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitUnsigned()) 0L
if n > int64 UInt32.MaxValue || n < 0L then fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitUnsigned()) (UINT32(0u)) else
UINT32(uint32 (uint64 n)) }
| uint32l
{
let s = removeUnderscores (lexemeTrimRight lexbuf 2)
let n =
try int64 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitUnsigned()) 0L
if n > int64 UInt32.MaxValue || n < 0L then fail args lexbuf (FSComp.SR.lexOutsideThirtyTwoBitUnsigned()) (UINT32(0u)) else
UINT32(uint32 (uint64 n)) }
| int64
{ let s = removeUnderscores (lexemeTrimRight lexbuf 1)
// Allow <max_int+1> to parse as min_int. Stupid but allowed because we parse '-' as an operator.
if Ranges.isInt64BadMax s then INT64(Int64.MinValue, true (* 'true' = 'bad'*) ) else
let n =
try int64 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideSixtyFourBitSigned()) 0L
INT64(n,false)
}
| uint64
{ let s = removeUnderscores (lexemeTrimRight lexbuf 2)
let n =
try uint64 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideSixtyFourBitUnsigned()) 0UL
UINT64(n) }
| nativeint
{ let s = removeUnderscores (lexemeTrimRight lexbuf 1)
// Allow <max_nativeint+1> to parse as min_nativeint. Stupid but allowed because we parse '-' as an operator.
if Ranges.isInt64BadMax s then NATIVEINT(Int64.MinValue, true) else
let n =
try int64 s with _ -> fail args lexbuf (FSComp.SR.lexOutsideNativeSigned()) 0L
NATIVEINT(n,false)
}
| unativeint
{ try
UNATIVEINT(uint64 (removeUnderscores (lexemeTrimRight lexbuf 2)))
with _ -> fail args lexbuf (FSComp.SR.lexOutsideNativeUnsigned()) (UNATIVEINT(0UL)) }
| ieee32
{ IEEE32 (evalFloat args lexbuf) }
| ieee32_dotless_no_exponent
{ if lexbuf.SupportsFeature LanguageFeature.DotlessFloat32Literal then
IEEE32 (evalFloat args lexbuf)
else
fail args lexbuf (FSComp.SR.lexInvalidFloat()) (IEEE32 0.0f)
}
| ieee64
{ IEEE64 (try float(lexeme lexbuf) with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0.0) }
| decimal
{ try
let s = removeUnderscores (lexemeTrimRight lexbuf 1)
// This implements a range check for decimal literals
let d = System.Decimal.Parse(s,System.Globalization.NumberStyles.AllowExponent ||| System.Globalization.NumberStyles.Number,System.Globalization.CultureInfo.InvariantCulture)
DECIMAL d
with
e -> fail args lexbuf (FSComp.SR.lexOusideDecimal()) (DECIMAL (decimal 0))
}
| xieee32
{
let s = removeUnderscores (lexemeTrimRight lexbuf 2)
// Even though the intermediate step is an int64, display the "invalid float" message, since it will be less confusing to the user
let n64 = (try (int64 s) with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0L)
if n64 > 0xFFFFFFFFL || n64 < 0L then fail args lexbuf (FSComp.SR.lexOusideThirtyTwoBitFloat()) (IEEE32 0.0f) else
IEEE32 (System.BitConverter.ToSingle(System.BitConverter.GetBytes(int32 (uint32 (uint64 n64))),0)) }
| xieee64
{
let n64 = (try int64 (removeUnderscores (lexemeTrimRight lexbuf 2)) with _ -> fail args lexbuf (FSComp.SR.lexInvalidFloat()) 0L)
IEEE64 (System.BitConverter.Int64BitsToDouble(n64)) }
| bignum
{ let s = lexeme lexbuf
BIGNUM (removeUnderscores (lexemeTrimRight lexbuf 1), s.[s.Length-1..s.Length-1]) }
| (int | xint | float) ident_char+
{ fail args lexbuf (FSComp.SR.lexInvalidNumericLiteral()) (INT32(0,false)) }
| char
{ let s = lexeme lexbuf
CHAR (if s.[1] = '\\' then escape s.[2] else s.[1]) }
| char 'B'
{ let s = lexeme lexbuf
let x = int32 (if s.[1] = '\\' then escape s.[2] else s.[1])
if x < 0 || x > 127 then
fail args lexbuf (FSComp.SR.lexInvalidByteLiteral()) (UINT8(byte 0))
else
UINT8 (byte(x)) }
| '\'' trigraph '\''
{ let s = lexeme lexbuf
let c = trigraph s.[2] s.[3] s.[4]
let x = int32 c
if x < 0 || x > 255 then
fail args lexbuf (FSComp.SR.lexInvalidCharLiteral()) (CHAR c)
else
CHAR c }
| '\'' trigraph '\'' 'B'
{ let s = lexeme lexbuf
let x = int32 (trigraph s.[2] s.[3] s.[4])
if x < 0 || x > 255 then
fail args lexbuf (FSComp.SR.lexInvalidByteLiteral()) (UINT8(byte 0))
else
UINT8 (byte(x)) }
| '\'' unicodeGraphShort '\'' 'B'
{ let x = int32 (unicodeGraphShort (lexemeTrimBoth lexbuf 3 2))
if x < 0 || x > 127 then
fail args lexbuf (FSComp.SR.lexInvalidByteLiteral()) (UINT8(byte 0))
else
UINT8 (byte(x)) }
| '\'' hexGraphShort '\'' { CHAR (char (int32 (hexGraphShort (lexemeTrimBoth lexbuf 3 1)))) }
| '\'' unicodeGraphShort '\'' { CHAR (char (int32 (unicodeGraphShort (lexemeTrimBoth lexbuf 3 1)))) }
| '\'' unicodeGraphLong '\''
{ match unicodeGraphLong (lexemeTrimBoth lexbuf 3 1) with
| SingleChar(c) -> CHAR (char c)
| _ -> fail args lexbuf (FSComp.SR.lexThisUnicodeOnlyInStringLiterals()) (CHAR (char 0)) }
| "(*IF-FSHARP"
{ if lexbuf.SupportsFeature LanguageFeature.MLCompatRevisions then
mlCompatWarning (FSComp.SR.lexIndentOffForML()) lexbuf.LexemeRange
if not skip then COMMENT (LexCont.Token (args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| "(*F#"
{ if not skip then COMMENT (LexCont.Token (args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| "ENDIF-FSHARP*)"
{ if not skip then COMMENT (LexCont.Token (args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| "F#*)"
{ if not skip then COMMENT (LexCont.Token (args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| "(*)"
{ LPAREN_STAR_RPAREN }
| "(*"
{ let m = lexbuf.LexemeRange
if not skip then COMMENT (LexCont.Comment(args.ifdefStack, args.stringNest, 1, m))
else comment (1,m,args) skip lexbuf }
| "(*IF-CAML*)" | "(*IF-OCAML*)"
{ let m = lexbuf.LexemeRange
if not skip then COMMENT (LexCont.MLOnly(args.ifdefStack, args.stringNest, m))
else mlOnly m args skip lexbuf }
| '"'
{ let buf, fin, m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| (_, LexerStringStyle.TripleQuote, _) :: _ -> ()
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexSingleQuoteInSingleQuote(), m))
| [] -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.SingleQuote, LexerStringKind.String, m))
else singleQuoteString (buf, fin, m, LexerStringKind.String, args) skip lexbuf }
| '$' '"' '"' '"'
{ let buf, fin, m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexTripleQuoteInTripleQuote(), m))
| [] -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.TripleQuote, LexerStringKind.InterpolatedStringFirst, m))
else tripleQuoteString (buf, fin, m, LexerStringKind.InterpolatedStringFirst, args) skip lexbuf }
| '$' '"'
{ let buf,fin,m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| (_, LexerStringStyle.TripleQuote, _) :: _ -> ()
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexSingleQuoteInSingleQuote(), m))
| _ -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.SingleQuote, LexerStringKind.InterpolatedStringFirst, m))
else singleQuoteString (buf, fin, m, LexerStringKind.InterpolatedStringFirst, args) skip lexbuf }
| '"' '"' '"'
{ let buf, fin, m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexTripleQuoteInTripleQuote(), m))
| _ -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.TripleQuote, LexerStringKind.String, m))
else tripleQuoteString (buf, fin, m, LexerStringKind.String, args) skip lexbuf }
| '@' '"'
{ let buf, fin, m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| (_, LexerStringStyle.TripleQuote, _) :: _ -> ()
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexSingleQuoteInSingleQuote(), m))
| _ -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.Verbatim, LexerStringKind.String, m))
else verbatimString (buf, fin, m, LexerStringKind.String, args) skip lexbuf }
| ("$@" | "@$") '"'
{ let buf, fin, m = startString args lexbuf
// Single quote in triple quote ok, others disallowed
match args.stringNest with
| (_, LexerStringStyle.TripleQuote, _) :: _ -> ()
| _ :: rest ->
args.stringNest <- rest
errorR(Error(FSComp.SR.lexSingleQuoteInSingleQuote(), m))
| _ -> ()
if not skip then STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, LexerStringStyle.Verbatim, LexerStringKind.InterpolatedStringFirst, m))
else verbatimString (buf, fin, m, LexerStringKind.InterpolatedStringFirst, args) skip lexbuf }
| truewhite+
{ if skip then token args skip lexbuf
else WHITESPACE (LexCont.Token(args.ifdefStack, args.stringNest)) }
| offwhite+
{ if args.indentationSyntaxStatus.Status then errorR(Error(FSComp.SR.lexTabsNotAllowed(), lexbuf.LexemeRange))
if not skip then WHITESPACE (LexCont.Token(args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| "////" op_char*
{ // 4+ slash are 1-line comments, online 3 slash are XmlDoc
let m = lexbuf.LexemeRange
LexbufLocalXmlDocStore.AddGrabPointDelayed(lexbuf)
if not skip then LINE_COMMENT (LexCont.SingleLineComment(args.ifdefStack, args.stringNest, 1, m))
else singleLineComment (None,1,m,m,args) skip lexbuf }
| "///" op_char*
{ // Match exactly 3 slash, 4+ slash caught by preceding rule
let m = lexbuf.LexemeRange
let doc = lexemeTrimLeft lexbuf 3
let sb = (new StringBuilder(100)).Append(doc)
if not skip then LINE_COMMENT (LexCont.SingleLineComment(args.ifdefStack, args.stringNest, 1, m))
else singleLineComment (Some (m, sb),1,m,m,args) skip lexbuf }
| "//" op_char*
{ // Need to read all operator symbols too, otherwise it might be parsed by a rule below
let m = lexbuf.LexemeRange
LexbufLocalXmlDocStore.AddGrabPointDelayed(lexbuf)
if not skip then LINE_COMMENT (LexCont.SingleLineComment(args.ifdefStack, args.stringNest, 1, m))
else singleLineComment (None,1,m,m,args) skip lexbuf }
| newline
{ newline lexbuf
if not skip then WHITESPACE (LexCont.Token(args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| '`' '`' ([^'`' '\n' '\r' '\t'] | '`' [^'`''\n' '\r' '\t']) + '`' '`'
{ Keywords.IdentifierToken args lexbuf (lexemeTrimBoth lexbuf 2 2) }
| ('#' anywhite* | "#line" anywhite+ ) digit+ anywhite* ('@'? "\"" [^'\n''\r''"']+ '"')? anywhite* newline
{ let pos = lexbuf.EndPos
if skip then
let s = lexeme lexbuf
let rec parseLeadingDirective n =
match s.[n] with
| c when c >= 'a' && c <= 'z' -> parseLeadingDirective (n+1)
| _ -> parseLeadingWhitespace n // goto the next state
and parseLeadingWhitespace n =
match s.[n] with
| ' ' | '\t' -> parseLeadingWhitespace (n+1)
| _ -> parseLineNumber n n // goto the next state
and parseLineNumber start n =
match s.[n] with
| c when c >= '0' && c <= '9' -> parseLineNumber start (n+1)
| _ ->
let text = String.sub s start (n-start)
let lineNumber =
try
int32 text
with err ->
errorR(Error(FSComp.SR.lexInvalidLineNumber(text), lexbuf.LexemeRange))
0
lineNumber, parseWhitespaceBeforeFile n // goto the next state
and parseWhitespaceBeforeFile n =
match s.[n] with
| ' ' | '\t' | '@' -> parseWhitespaceBeforeFile (n+1)
| '"' -> Some (parseFile (n+1) (n+1))
| _ -> None
and parseFile start n =
match s.[n] with
| '"' -> String.sub s start (n-start)
| _ -> parseFile start (n+1)
// Call the parser
let line, file = parseLeadingDirective 1
// Construct the new position
if args.applyLineDirectives then
lexbuf.EndPos <- pos.ApplyLineDirective((match file with Some f -> FileIndex.fileIndexOfFile f | None -> pos.FileIndex), line)
else
// add a newline when we don't apply a directive since we consumed a newline getting here
newline lexbuf
token args skip lexbuf
else
// add a newline when we don't apply a directive since we consumed a newline getting here
newline lexbuf
HASH_LINE (LexCont.Token (args.ifdefStack, args.stringNest))
}
| "<@" { checkExprOp lexbuf; LQUOTE ("<@ @>", false) }
| "<@@" { checkExprOp lexbuf; LQUOTE ("<@@ @@>", true) }
| "@>" { checkExprOp lexbuf; RQUOTE ("<@ @>", false) }
| "@@>" { checkExprOp lexbuf; RQUOTE ("<@@ @@>", true) }
| '#' { HASH }
| '&' { AMP }
| "&&" { AMP_AMP }
| "||" { BAR_BAR }
| '\'' { QUOTE }
| '(' { LPAREN }
| ')' { RPAREN }
| '*' { STAR }
| ',' { COMMA }
| "->" { RARROW }
| "?" { QMARK }
| "??" { QMARK_QMARK }
| ".." { DOT_DOT }
| "..^" { DOT_DOT_HAT }
| "." { DOT }
| ":" { COLON }
| "::" { COLON_COLON }
| ":>" { COLON_GREATER }
| "@>." { RQUOTE_DOT ("<@ @>",false) }
| "@@>." { RQUOTE_DOT ("<@@ @@>",true) }
| ">|]" { GREATER_BAR_RBRACK }
| ":?>" { COLON_QMARK_GREATER }
| ":?" { COLON_QMARK }
| ":=" { COLON_EQUALS }
| ";;" { SEMICOLON_SEMICOLON }
| ";" { SEMICOLON }
| "<-" { LARROW }
| "=" { EQUALS }
| "[" { LBRACK }
| "[|" { LBRACK_BAR }
| "{|" { LBRACE_BAR }
| "<" { LESS false }
| ">" { GREATER false }
| "[<" { LBRACK_LESS }
| "]" { RBRACK }
| "|]" { BAR_RBRACK }
| "|}" { BAR_RBRACE }
| ">]" { GREATER_RBRACK }
| "{"
{
match args.stringNest with
| [] -> ()
| (counter, style, m) :: rest ->
// Note, we do not update the 'm', any incomplete-interpolation error
// will be reported w.r.t. the first '{'
args.stringNest <- (counter + 1, style, m) :: rest
// To continue token-by-token lexing may involve picking up the new args.stringNes
let cont = LexCont.Token(args.ifdefStack, args.stringNest)
LBRACE cont
}
| "|" { BAR }
| "}"
{
// We encounter a '}' in the expression token stream. First check if we're in an interpolated string expression
// and continue the string if necessary
match args.stringNest with
| (1, style, _) :: rest ->
args.stringNest <- rest
let buf, fin, m = startString args lexbuf
if not skip then
STRING_TEXT (LexCont.String(args.ifdefStack, args.stringNest, style, LexerStringKind.InterpolatedStringPart, m))
else
match style with
| LexerStringStyle.Verbatim -> verbatimString (buf, fin, m, LexerStringKind.InterpolatedStringPart, args) skip lexbuf
| LexerStringStyle.SingleQuote -> singleQuoteString (buf, fin, m, LexerStringKind.InterpolatedStringPart, args) skip lexbuf
| LexerStringStyle.TripleQuote -> tripleQuoteString (buf, fin, m, LexerStringKind.InterpolatedStringPart, args) skip lexbuf
| (counter, style, m) :: rest ->
// Note, we do not update the 'm', any incomplete-interpolation error
// will be reported w.r.t. the first '{'
args.stringNest <- (counter - 1, style, m) :: rest
let cont = LexCont.Token(args.ifdefStack, args.stringNest)
RBRACE cont
| _ ->
let cont = LexCont.Token(args.ifdefStack, args.stringNest)
RBRACE cont
}
| "$" { DOLLAR }
| "%" { PERCENT_OP("%") }
| "%%" { PERCENT_OP("%%") }
| "-" { MINUS }
| "~" { RESERVED }
| "`" { RESERVED }
| ignored_op_char* '*' '*' op_char* { checkExprOp lexbuf; INFIX_STAR_STAR_OP(lexeme lexbuf) }
| ignored_op_char* ('*' | '/'|'%') op_char* { checkExprOp lexbuf; INFIX_STAR_DIV_MOD_OP(lexeme lexbuf) }
| ignored_op_char* ('+'|'-') op_char* { checkExprOp lexbuf; PLUS_MINUS_OP(lexeme lexbuf) }
| ignored_op_char* ('@'|'^') op_char* { checkExprOp lexbuf; INFIX_AT_HAT_OP(lexeme lexbuf) }
| ignored_op_char* ('=' | "!=" | '<' | '>' | '$') op_char* { checkExprOp lexbuf; INFIX_COMPARE_OP(lexeme lexbuf) }
| ignored_op_char* ('&') op_char* { checkExprOp lexbuf; INFIX_AMP_OP(lexeme lexbuf) }
| ignored_op_char* '|' op_char* { checkExprOp lexbuf; INFIX_BAR_OP(lexeme lexbuf) }
| ignored_op_char* ('!' | '~' ) op_char* { checkExprOp lexbuf; PREFIX_OP(lexeme lexbuf) }
| ".[]" | ".[]<-" | ".[,]<-" | ".[,,]<-" | ".[,,,]<-" | ".[,,,]" | ".[,,]" | ".[,]" | ".[..]" | ".[..,..]" | ".[..,..,..]" | ".[..,..,..,..]"
| ".()" | ".()<-" { FUNKY_OPERATOR_NAME(lexeme lexbuf) }
| "#!" op_char*
{ // Treat shebangs like regular comments, but they are only allowed at the start of a file
let m = lexbuf.LexemeRange
let tok = LINE_COMMENT (LexCont.SingleLineComment(args.ifdefStack, args.stringNest, 1, m))
let tok = shouldStartFile args lexbuf m (0,FSComp.SR.lexHashBangMustBeFirstInFile()) tok
if not skip then tok else singleLineComment (None,1,m,m,args) skip lexbuf }
| "#light" anywhite*
| ("#indent" | "#light") anywhite+ "\"on\""
{ if args.indentationSyntaxStatus.ExplicitlySet && args.indentationSyntaxStatus.WarnOnMultipleTokens then
let s = lexeme lexbuf
warning(Error((0, sprintf "%s should only be set once in an F# source file." s), lexbuf.LexemeRange))
// TODO: where should this go? (abelb)
//warning(Error((0,"#light should only occur as the first non-comment text in an F# source file."), lexbuf.LexemeRange))
args.indentationSyntaxStatus.Status <- true
if not skip then HASH_LIGHT (LexCont.Token(args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| ("#indent" | "#light") anywhite+ "\"off\""
{ args.indentationSyntaxStatus.Status <- false
if lexbuf.SupportsFeature LanguageFeature.MLCompatRevisions then
mlCompatError (FSComp.SR.mlCompatLightOffNoLongerSupported()) lexbuf.LexemeRange
else
mlCompatWarning (FSComp.SR.lexIndentOffForML()) lexbuf.LexemeRange
if not skip then HASH_LIGHT (LexCont.Token (args.ifdefStack, args.stringNest))
else token args skip lexbuf }
| anywhite* "#if" anywhite+ anystring
{ let m = lexbuf.LexemeRange
let lookup id = List.contains id args.conditionalDefines
let lexed = lexeme lexbuf
let isTrue, expr = evalIfDefExpression lexbuf.StartPos lexbuf.ReportLibraryOnlyFeatures lexbuf.LanguageVersion args lookup lexed
args.ifdefStack <- (IfDefIf,m) :: args.ifdefStack
LexbufIfdefStore.SaveIfHash(lexbuf, lexed, expr, m)
// Get the token; make sure it starts at zero position & return
let cont, f =
if isTrue then
let cont = LexCont.EndLine(args.ifdefStack, args.stringNest, LexerEndlineContinuation.Token)
let f = endline LexerEndlineContinuation.Token args skip
cont, f
else
let cont = LexCont.EndLine(args.ifdefStack, args.stringNest, LexerEndlineContinuation.Skip(0, m))
let f = endline (LexerEndlineContinuation.Skip(0, m)) args skip
cont, f
let tok = shouldStartLine args lexbuf m (FSComp.SR.lexHashIfMustBeFirst()) (HASH_IF(m,lexed,cont))
if not skip then tok else f lexbuf }
| anywhite* "#else" anywhite* ("//" [^'\n''\r']*)?
{ let lexed = (lexeme lexbuf)
match args.ifdefStack with
| [] -> LEX_FAILURE (FSComp.SR.lexHashElseNoMatchingIf())
| (IfDefElse,_) :: _rest -> LEX_FAILURE (FSComp.SR.lexHashEndifRequiredForElse())
| (IfDefIf,_) :: rest ->
let m = lexbuf.LexemeRange
args.ifdefStack <- (IfDefElse,m) :: rest
LexbufIfdefStore.SaveElseHash(lexbuf, lexed, m)
let tok = HASH_ELSE(m, lexed, LexCont.EndLine(args.ifdefStack, args.stringNest, LexerEndlineContinuation.Skip(0, m)))
let tok = shouldStartLine args lexbuf m (FSComp.SR.lexHashElseMustBeFirst()) tok
if not skip then tok else endline (LexerEndlineContinuation.Skip(0, m)) args skip lexbuf }
| anywhite* "#endif" anywhite* ("//" [^'\n''\r']*)?