cmahon / interactive-brokers Goto Github PK
View Code? Open in Web Editor NEWInteractive Brokers API
License: BSD 3-Clause "New" or "Revised" License
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status / direction of library
I noticed that Builder.hs only provides 2 functions, one for futures & one for market orders.
Is this library also geared to be used for stock securities, or will it simply only target forex & currencies?
The readme says it's a work in progress. Is there any plans to finish the library?
I am curious if i should implement my own library; it seems I'm interested in different features.
use Lazy ByteString for output of builder.
Another thing I would suggest is to use lazy bytestring for output of Builders. All builders produces lazy bytestring by default. And writing lazy bytestring maybe more efficient since it may uses vector writes. pipes-network 0.6.4 have lazy bytestring write support.
Parser suggestions
-- These are merely suggestions, I have not tested them
parseEmptyField :: Parser ()
parseEmptyField = char sepC *> return () -- no need to call (string "")
-- avoid (s == "") and read . eg:
parseIntField' :: Parser Int -- shouldn't this be Parser (Maybe Int)?
parseIntField' = (parseEmptyField *> return 0) <|> parseIntField
-- avoid using String. eg:
parseMaybeEmpty :: Parser a -> Parser (Maybe a)
-- This will NEVER fail, which is similar to your implementation.
-- remove last "return Nothing" to allow it to fail.
parseMaybeEmpty parser = mconcat $
[ (parseEmptyField *> return Nothing)
, Just <$> parser
, return Nothing
]
-- combine boolean parsers
parseBool :: Parser Bool
parseBool = mconcat $ parseField <$>
[ char '1' <|> stringCI "true" *> return True
, char '0' <|> stringCI "false" *> return False
]
Using Text or Bytestring instead of String for textual fields
Use Scientific to represent numerical value
Other than "why-not":
- "double" from attoparsec actually parse bytestring into Scientific, then converts it to Double.
- "scientific" from attoparsec internally handles sign/unsigned parsing, and it can represents signed/unsigned Integer and Floating point number. You can probably simplify a lot of parser.
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