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fix hex float exponent parsing

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This commit is contained in:
Ilya Rezvov
2018-01-19 11:06:38 -08:00
parent 5c4ca137a5
commit 9d6bd7f097
1 changed files with 4 additions and 2 deletions
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src/Language/Wasm/Lexer.x
+4 -2
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@@ -41,7 +41,7 @@ $doublequote = \"
@float = @floatfrac | @scientificint | @scientificfloat
@hexfloatfrac = "0x" @hexnum "." (@hexnum)?
@hexexp = [Pp] $sign? @num
@hexscientificint = "0x" @hexnum @exp
@hexscientificint = "0x" @hexnum @hexexp
@hexscientificfloat = @hexfloatfrac @hexexp
@hexfloat = @hexfloatfrac | @hexscientificint | @hexscientificfloat
@nanhex = "nan:0x" @hexnum
@@ -134,7 +134,7 @@ parseDecFloat = token $ \(pos, _, s, _) len ->
parseHexFloat :: AlexAction Lexeme
parseHexFloat = token $ \(pos, _, s, _) len ->
let (sign, slen) = parseSign s in
let ('0' : 'x' : str) = filter (/= '_') $ takeChars len $ LBS.drop slen s in
let ('0' : 'x' : str) = filter (/= '_') $ takeChars (len - slen) $ LBS.drop slen s in
Lexeme pos $ TFloatLit $ readHexFloat str
startBlockComment :: AlexAction Lexeme
@@ -333,6 +333,8 @@ readHexFloat str =
where
readHexExp :: String -> Double
readHexExp [] = 1
readHexExp ('+' : rest) = readHexExp rest
readHexExp ('-' : rest) = negate $ readHexExp rest
readHexExp expStr = 2 * read expStr
readHexFrac :: String -> Double