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refactor: parser cleanup
This commit is contained in:
Simon Michael
parent
27510b0106
commit
8fd94ef6f5
@ -3,151 +3,7 @@
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Parsers for standard ledger and timelog files.
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-}
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module Ledger.Parse
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where
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import Control.Monad.Error (ErrorT(..), MonadIO, liftIO, throwError, catchError)
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import Text.ParserCombinators.Parsec
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import Text.ParserCombinators.Parsec.Char
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import Text.ParserCombinators.Parsec.Combinator
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import System.Directory
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#if __GLASGOW_HASKELL__ <= 610
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import Prelude hiding (readFile, putStr, putStrLn, print, getContents)
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import System.IO.UTF8
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#endif
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import Ledger.Utils
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import Ledger.Types
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import Ledger.Dates
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import Ledger.AccountName (accountNameFromComponents,accountNameComponents)
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import Ledger.Amount
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import Ledger.Transaction
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import Ledger.Posting
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import Ledger.Journal
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import Ledger.Commodity (dollars,dollar,unknown)
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import System.FilePath(takeDirectory,combine)
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-- utils
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-- | Some context kept during parsing.
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data LedgerFileCtx = Ctx {
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ctxYear :: !(Maybe Integer) -- ^ the default year most recently specified with Y
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, ctxCommod :: !(Maybe String) -- ^ I don't know
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, ctxAccount :: ![String] -- ^ the current stack of "container" accounts specified by !account
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} deriving (Read, Show)
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emptyCtx :: LedgerFileCtx
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emptyCtx = Ctx { ctxYear = Nothing, ctxCommod = Nothing, ctxAccount = [] }
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-- containing accounts "nest" hierarchically
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pushParentAccount :: String -> GenParser tok LedgerFileCtx ()
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pushParentAccount parent = updateState addParentAccount
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where addParentAccount ctx0 = ctx0 { ctxAccount = normalize parent : ctxAccount ctx0 }
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normalize = (++ ":")
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popParentAccount :: GenParser tok LedgerFileCtx ()
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popParentAccount = do ctx0 <- getState
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case ctxAccount ctx0 of
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[] -> unexpected "End of account block with no beginning"
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(_:rest) -> setState $ ctx0 { ctxAccount = rest }
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getParentAccount :: GenParser tok LedgerFileCtx String
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getParentAccount = liftM (concat . reverse . ctxAccount) getState
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setYear :: Integer -> GenParser tok LedgerFileCtx ()
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setYear y = updateState (\ctx -> ctx{ctxYear=Just y})
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getYear :: GenParser tok LedgerFileCtx (Maybe Integer)
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getYear = liftM ctxYear getState
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-- let's get to it
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parseLedgerFile :: LocalTime -> FilePath -> ErrorT String IO Journal
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parseLedgerFile t "-" = liftIO getContents >>= parseLedger t "-"
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parseLedgerFile t f = liftIO (readFile f) >>= parseLedger t f
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-- | Parses the contents of a ledger file, or gives an error. Requires
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-- the current (local) time to calculate any unfinished timelog sessions,
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-- we pass it in for repeatability.
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parseLedger :: LocalTime -> FilePath -> String -> ErrorT String IO Journal
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parseLedger reftime inname intxt =
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case runParser ledgerFile emptyCtx inname intxt of
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Right m -> liftM (journalConvertTimeLog reftime) $ m `ap` return nulljournal
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Left err -> throwError $ show err
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ledgerFile :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerFile = do items <- many ledgerItem
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eof
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return $ liftM (foldr (.) id) $ sequence items
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where
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-- As all ledger line types can be distinguished by the first
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-- character, excepting transactions versus empty (blank or
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-- comment-only) lines, can use choice w/o try
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ledgerItem = choice [ ledgerDirective
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, liftM (return . addTransaction) ledgerTransaction
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, liftM (return . addModifierTransaction) ledgerModifierTransaction
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, liftM (return . addPeriodicTransaction) ledgerPeriodicTransaction
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, liftM (return . addHistoricalPrice) ledgerHistoricalPrice
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, ledgerDefaultYear
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, ledgerIgnoredPrice
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, ledgerTagDirective
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, ledgerEndTagDirective
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, emptyLine >> return (return id)
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, liftM (return . addTimeLogEntry) timelogentry
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]
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ledgerDirective :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerDirective = do char '!' <?> "directive"
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directive <- many nonspace
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case directive of
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"include" -> ledgerInclude
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"account" -> ledgerAccountBegin
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"end" -> ledgerAccountEnd
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_ -> mzero
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ledgerInclude :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerInclude = do many1 spacenonewline
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filename <- restofline
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outerState <- getState
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outerPos <- getPosition
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let inIncluded = show outerPos ++ " in included file " ++ show filename ++ ":\n"
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return $ do contents <- expandPath outerPos filename >>= readFileE outerPos
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case runParser ledgerFile outerState filename contents of
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Right l -> l `catchError` (throwError . (inIncluded ++))
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Left perr -> throwError $ inIncluded ++ show perr
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where readFileE outerPos filename = ErrorT $ liftM Right (readFile filename) `catch` leftError
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where leftError err = return $ Left $ currentPos ++ whileReading ++ show err
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currentPos = show outerPos
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whileReading = " reading " ++ show filename ++ ":\n"
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expandPath :: (MonadIO m) => SourcePos -> FilePath -> m FilePath
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expandPath pos fp = liftM mkRelative (expandHome fp)
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where
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mkRelative = combine (takeDirectory (sourceName pos))
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expandHome inname | "~/" `isPrefixOf` inname = do homedir <- liftIO getHomeDirectory
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return $ homedir ++ drop 1 inname
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| otherwise = return inname
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ledgerAccountBegin :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerAccountBegin = do many1 spacenonewline
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parent <- ledgeraccountname
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newline
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pushParentAccount parent
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return $ return id
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ledgerAccountEnd :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerAccountEnd = popParentAccount >> return (return id)
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-- parsers
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-- | Parse a Journal from either a ledger file or a timelog file.
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-- It tries first the timelog parser then the ledger parser; this means
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-- parse errors for ledgers are useful while those for timelogs are not.
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{-| Parse a ledger file. Here is the ledger grammar from the ledger 2.5 manual:
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Here is the ledger grammar from the ledger 2.5 manual:
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@
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The ledger file format is quite simple, but also very flexible. It supports
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@ -245,9 +101,147 @@ i, o, b, h
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timelog files.
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@
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See "Tests" for sample data.
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Here is the timelog grammar from timeclock.el 2.6:
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@
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A timelog contains data in the form of a single entry per line.
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Each entry has the form:
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CODE YYYY/MM/DD HH:MM:SS [COMMENT]
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CODE is one of: b, h, i, o or O. COMMENT is optional when the code is
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i, o or O. The meanings of the codes are:
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b Set the current time balance, or \"time debt\". Useful when
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archiving old log data, when a debt must be carried forward.
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The COMMENT here is the number of seconds of debt.
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h Set the required working time for the given day. This must
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be the first entry for that day. The COMMENT in this case is
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the number of hours in this workday. Floating point amounts
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are allowed.
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i Clock in. The COMMENT in this case should be the name of the
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project worked on.
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o Clock out. COMMENT is unnecessary, but can be used to provide
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a description of how the period went, for example.
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O Final clock out. Whatever project was being worked on, it is
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now finished. Useful for creating summary reports.
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@
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Example:
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i 2007/03/10 12:26:00 hledger
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o 2007/03/10 17:26:02
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-}
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module Ledger.Parse
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where
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import Control.Monad.Error (ErrorT(..), MonadIO, liftIO, throwError, catchError)
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import Text.ParserCombinators.Parsec
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import Text.ParserCombinators.Parsec.Char
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import Text.ParserCombinators.Parsec.Combinator
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import System.Directory
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#if __GLASGOW_HASKELL__ <= 610
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import Prelude hiding (readFile, putStr, putStrLn, print, getContents)
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import System.IO.UTF8
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#endif
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import Ledger.Utils
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import Ledger.Types
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import Ledger.Dates
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import Ledger.AccountName (accountNameFromComponents,accountNameComponents)
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import Ledger.Amount
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import Ledger.Transaction
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import Ledger.Posting
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import Ledger.Journal
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import Ledger.Commodity (dollars,dollar,unknown)
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import System.FilePath(takeDirectory,combine)
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-- | Some context kept during parsing.
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data LedgerFileCtx = Ctx {
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ctxYear :: !(Maybe Integer) -- ^ the default year most recently specified with Y
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, ctxCommod :: !(Maybe String) -- ^ I don't know
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, ctxAccount :: ![String] -- ^ the current stack of parent accounts specified by !account
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} deriving (Read, Show)
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emptyCtx :: LedgerFileCtx
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emptyCtx = Ctx { ctxYear = Nothing, ctxCommod = Nothing, ctxAccount = [] }
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setYear :: Integer -> GenParser tok LedgerFileCtx ()
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setYear y = updateState (\ctx -> ctx{ctxYear=Just y})
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getYear :: GenParser tok LedgerFileCtx (Maybe Integer)
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getYear = liftM ctxYear getState
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pushParentAccount :: String -> GenParser tok LedgerFileCtx ()
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pushParentAccount parent = updateState addParentAccount
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where addParentAccount ctx0 = ctx0 { ctxAccount = normalize parent : ctxAccount ctx0 }
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normalize = (++ ":")
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popParentAccount :: GenParser tok LedgerFileCtx ()
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popParentAccount = do ctx0 <- getState
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case ctxAccount ctx0 of
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[] -> unexpected "End of account block with no beginning"
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(_:rest) -> setState $ ctx0 { ctxAccount = rest }
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getParentAccount :: GenParser tok LedgerFileCtx String
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getParentAccount = liftM (concat . reverse . ctxAccount) getState
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expandPath :: (MonadIO m) => SourcePos -> FilePath -> m FilePath
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expandPath pos fp = liftM mkRelative (expandHome fp)
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where
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mkRelative = combine (takeDirectory (sourceName pos))
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expandHome inname | "~/" `isPrefixOf` inname = do homedir <- liftIO getHomeDirectory
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return $ homedir ++ drop 1 inname
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| otherwise = return inname
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-- let's get to it
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-- | Parses a ledger file or timelog file to a "Journal", or gives an
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-- error. Requires the current (local) time to calculate any unfinished
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-- timelog sessions, we pass it in for repeatability.
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parseLedgerFile :: LocalTime -> FilePath -> ErrorT String IO Journal
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parseLedgerFile t "-" = liftIO getContents >>= parseLedger t "-"
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parseLedgerFile t f = liftIO (readFile f) >>= parseLedger t f
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-- | Like parseLedgerFile, but parses a string. A file path is still
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-- provided to save in the resulting journal.
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parseLedger :: LocalTime -> FilePath -> String -> ErrorT String IO Journal
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parseLedger reftime inname intxt =
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case runParser ledgerFile emptyCtx inname intxt of
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Right m -> liftM (journalConvertTimeLog reftime) $ m `ap` return nulljournal
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Left err -> throwError $ show err -- XXX raises an uncaught exception if we have a parsec user error, eg from many ?
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-- parsers
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-- | Top-level journal parser. Returns a mighty composite, I/O performing,
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-- error-raising journal transformation, which should be applied to a
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-- journal to get the final result.
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ledgerFile :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerFile = do items <- many ledgerItem
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eof
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return $ liftM (foldr (.) id) $ sequence items
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where
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-- As all ledger line types can be distinguished by the first
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-- character, excepting transactions versus empty (blank or
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-- comment-only) lines, can use choice w/o try
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ledgerItem = choice [ ledgerExclamationDirective
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, liftM (return . addTransaction) ledgerTransaction
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, liftM (return . addModifierTransaction) ledgerModifierTransaction
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, liftM (return . addPeriodicTransaction) ledgerPeriodicTransaction
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, liftM (return . addHistoricalPrice) ledgerHistoricalPrice
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, ledgerDefaultYear
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, ledgerIgnoredPriceCommodity
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, ledgerTagDirective
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, ledgerEndTagDirective
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, emptyLine >> return (return id)
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, liftM (return . addTimeLogEntry) timelogentry
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]
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emptyLine :: GenParser Char st ()
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emptyLine = do many spacenonewline
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optional $ (char ';' <?> "comment") >> many (noneOf "\n")
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@ -270,6 +264,41 @@ ledgercommentline = do
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return s
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<?> "comment"
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ledgerExclamationDirective :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerExclamationDirective = do
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char '!' <?> "directive"
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directive <- many nonspace
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case directive of
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"include" -> ledgerInclude
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"account" -> ledgerAccountBegin
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"end" -> ledgerAccountEnd
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_ -> mzero
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ledgerInclude :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerInclude = do many1 spacenonewline
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filename <- restofline
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outerState <- getState
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outerPos <- getPosition
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let inIncluded = show outerPos ++ " in included file " ++ show filename ++ ":\n"
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return $ do contents <- expandPath outerPos filename >>= readFileE outerPos
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case runParser ledgerFile outerState filename contents of
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Right l -> l `catchError` (throwError . (inIncluded ++))
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Left perr -> throwError $ inIncluded ++ show perr
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where readFileE outerPos filename = ErrorT $ liftM Right (readFile filename) `catch` leftError
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where leftError err = return $ Left $ currentPos ++ whileReading ++ show err
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currentPos = show outerPos
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whileReading = " reading " ++ show filename ++ ":\n"
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ledgerAccountBegin :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerAccountBegin = do many1 spacenonewline
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parent <- ledgeraccountname
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newline
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pushParentAccount parent
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return $ return id
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ledgerAccountEnd :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerAccountEnd = popParentAccount >> return (return id)
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ledgerModifierTransaction :: GenParser Char LedgerFileCtx ModifierTransaction
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ledgerModifierTransaction = do
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char '=' <?> "modifier transaction"
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@ -298,8 +327,8 @@ ledgerHistoricalPrice = do
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restofline
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return $ HistoricalPrice date symbol price
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ledgerIgnoredPrice :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerIgnoredPrice = do
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ledgerIgnoredPriceCommodity :: GenParser Char LedgerFileCtx (ErrorT String IO (Journal -> Journal))
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ledgerIgnoredPriceCommodity = do
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char 'N' <?> "ignored-price commodity"
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many1 spacenonewline
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commoditysymbol
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@ -331,8 +360,8 @@ ledgerDefaultYear = do
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setYear y'
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return $ return id
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-- | Try to parse a ledger entry. If we successfully parse an entry, ensure it is balanced,
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-- and if we cannot, raise an error.
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-- | Try to parse a ledger entry. If we successfully parse an entry,
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-- check it can be balanced, and fail if not.
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ledgerTransaction :: GenParser Char LedgerFileCtx Transaction
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ledgerTransaction = do
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date <- ledgerdate <?> "transaction"
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@ -356,8 +385,8 @@ ledgerfulldate = do
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(y,m,d) <- ymd
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return $ fromGregorian (read y) (read m) (read d)
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-- | Match a partial M/D date in a ledger. Warning, this terminates the
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-- program if it finds a match when there is no default year specified.
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-- | Match a partial M/D date in a ledger, and also require that a default
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-- year directive was previously encountered.
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ledgerpartialdate :: GenParser Char LedgerFileCtx Day
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ledgerpartialdate = do
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(_,m,d) <- md
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@ -381,7 +410,7 @@ ledgerdatetime = do
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ledgereffectivedate :: Day -> GenParser Char LedgerFileCtx (Maybe Day)
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ledgereffectivedate actualdate = do
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char '='
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-- kludgily use actual date for default year
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-- kludgy way to use actual date for default year
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let withDefaultYear d p = do
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y <- getYear
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let (y',_,_) = toGregorian d in setYear y'
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@ -397,9 +426,9 @@ ledgerstatus = try (do { many1 spacenonewline; char '*' <?> "status"; return Tru
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ledgercode :: GenParser Char st String
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ledgercode = try (do { many1 spacenonewline; char '(' <?> "code"; code <- anyChar `manyTill` char ')'; return code } ) <|> return ""
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-- Complicated to handle intermixed comment lines.. please make me better.
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ledgerpostings :: GenParser Char LedgerFileCtx [Posting]
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ledgerpostings = do
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-- complicated to handle intermixed comment lines.. please make me better.
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ctx <- getState
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let parses p = isRight . parseWithCtx ctx p
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ls <- many1 $ try linebeginningwithspaces
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@ -427,15 +456,15 @@ ledgerposting = do
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newline
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return (Posting status account' amount comment ptype Nothing)
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-- Qualify with the parent account from parsing context
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-- qualify with the parent account from parsing context
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transactionaccountname :: GenParser Char LedgerFileCtx AccountName
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transactionaccountname = liftM2 (++) getParentAccount ledgeraccountname
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-- | Account names may have single spaces inside them, and are terminated
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-- by two or more spaces. They should have one or more components of at
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-- least one character, separated by the account separator char.
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ledgeraccountname :: GenParser Char st String
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-- | Parse an account name. Account names may have single spaces inside
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-- them, and are terminated by two or more spaces. They should have one or
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-- more components of at least one character, separated by the account
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-- separator char.
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ledgeraccountname :: GenParser Char st AccountName
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ledgeraccountname = do
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a <- many1 (nonspace <|> singlespace)
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let a' = striptrailingspace a
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@ -450,6 +479,8 @@ ledgeraccountname = do
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-- accountnamechar = notFollowedBy (oneOf "()[]") >> nonspace
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-- <?> "account name character (non-bracket, non-parenthesis, non-whitespace)"
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-- | Parse an amount, with an optional left or right currency symbol and
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-- optional price.
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postingamount :: GenParser Char st MixedAmount
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postingamount =
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try (do
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@ -512,7 +543,7 @@ priceamount =
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-- gawd.. trying to parse a ledger number without error:
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-- | parse a ledger-style numeric quantity and also return the number of
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-- | Parse a ledger-style numeric quantity and also return the number of
|
||||
-- digits to the right of the decimal point and whether thousands are
|
||||
-- separated by comma.
|
||||
amountquantity :: GenParser Char st (Double, Int, Bool)
|
||||
@ -551,42 +582,7 @@ numberpartsstartingwithpoint = do
|
||||
return ("",frac)
|
||||
|
||||
|
||||
{-| Parse a timelog entry. Here is the timelog grammar from timeclock.el 2.6:
|
||||
|
||||
@
|
||||
A timelog contains data in the form of a single entry per line.
|
||||
Each entry has the form:
|
||||
|
||||
CODE YYYY/MM/DD HH:MM:SS [COMMENT]
|
||||
|
||||
CODE is one of: b, h, i, o or O. COMMENT is optional when the code is
|
||||
i, o or O. The meanings of the codes are:
|
||||
|
||||
b Set the current time balance, or \"time debt\". Useful when
|
||||
archiving old log data, when a debt must be carried forward.
|
||||
The COMMENT here is the number of seconds of debt.
|
||||
|
||||
h Set the required working time for the given day. This must
|
||||
be the first entry for that day. The COMMENT in this case is
|
||||
the number of hours in this workday. Floating point amounts
|
||||
are allowed.
|
||||
|
||||
i Clock in. The COMMENT in this case should be the name of the
|
||||
project worked on.
|
||||
|
||||
o Clock out. COMMENT is unnecessary, but can be used to provide
|
||||
a description of how the period went, for example.
|
||||
|
||||
O Final clock out. Whatever project was being worked on, it is
|
||||
now finished. Useful for creating summary reports.
|
||||
@
|
||||
|
||||
Example:
|
||||
|
||||
i 2007/03/10 12:26:00 hledger
|
||||
o 2007/03/10 17:26:02
|
||||
|
||||
-}
|
||||
-- | Parse a timelog entry.
|
||||
timelogentry :: GenParser Char LedgerFileCtx TimeLogEntry
|
||||
timelogentry = do
|
||||
code <- oneOf "bhioO"
|
||||
@ -596,10 +592,8 @@ timelogentry = do
|
||||
return $ TimeLogEntry (read [code]) datetime (fromMaybe "" comment)
|
||||
|
||||
|
||||
-- misc parsing
|
||||
|
||||
-- | Parse a --display expression which is a simple date predicate, like
|
||||
-- "d>[DATE]" or "d<=[DATE]", and return a posting-matching predicate.
|
||||
-- | Parse a hledger display expression, which is a simple date test like
|
||||
-- "d>[DATE]" or "d<=[DATE]", and return a "Posting"-matching predicate.
|
||||
datedisplayexpr :: GenParser Char st (Posting -> Bool)
|
||||
datedisplayexpr = do
|
||||
char 'd'
|
||||
@ -660,8 +654,8 @@ tests_Parse = TestList [
|
||||
assertParseEqual (parseWithCtx emptyCtx postingamount " $1.")
|
||||
(Mixed [Amount Commodity {symbol="$",side=L,spaced=False,comma=False,precision=0} 1 Nothing])
|
||||
|
||||
,"ledgerIgnoredPrice" ~: do
|
||||
assertParse (parseWithCtx emptyCtx ledgerIgnoredPrice "N $\n")
|
||||
,"ledgerIgnoredPriceCommodity" ~: do
|
||||
assertParse (parseWithCtx emptyCtx ledgerIgnoredPriceCommodity "N $\n")
|
||||
|
||||
,"ledgerTagDirective" ~: do
|
||||
assertParse (parseWithCtx emptyCtx ledgerTagDirective "tag foo\n")
|
||||
|
||||
Loading…
Reference in New Issue
Block a user