mirror of
https://github.com/simonmichael/hledger.git
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132 lines
3.7 KiB
Haskell
132 lines
3.7 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE TypeFamilies #-}
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module Hledger.Utils.Parse (
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SimpleStringParser,
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SimpleTextParser,
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TextParser,
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JournalParser,
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ErroringJournalParser,
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choice',
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choiceInState,
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surroundedBy,
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parsewith,
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parsewithString,
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parseWithState,
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parseWithState',
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fromparse,
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parseerror,
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showDateParseError,
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nonspace,
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isNonNewlineSpace,
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spacenonewline,
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restofline,
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eolof,
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-- * re-exports
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CustomErr
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)
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where
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import Control.Monad.Except (ExceptT)
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import Control.Monad.State.Strict (StateT, evalStateT)
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import Data.Char
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import Data.Functor.Identity (Identity(..))
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import Data.List
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import Data.Text (Text)
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import Text.Megaparsec
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import Text.Megaparsec.Char
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import Text.Megaparsec.Custom
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import Text.Printf
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import Hledger.Data.Types
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import Hledger.Utils.UTF8IOCompat (error')
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-- | A parser of string to some type.
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type SimpleStringParser a = Parsec CustomErr String a
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-- | A parser of strict text to some type.
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type SimpleTextParser = Parsec CustomErr Text -- XXX an "a" argument breaks the CsvRulesParser declaration somehow
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-- | A parser of text that runs in some monad.
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type TextParser m a = ParsecT CustomErr Text m a
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-- | A parser of text that runs in some monad, keeping a Journal as state.
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type JournalParser m a = StateT Journal (ParsecT CustomErr Text m) a
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-- | A parser of text that runs in some monad, keeping a Journal as
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-- state, that can throw an exception to end parsing, preventing
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-- further parser backtracking.
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type ErroringJournalParser m a =
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StateT Journal (ParsecT CustomErr Text (ExceptT FinalParseError m)) a
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-- | Backtracking choice, use this when alternatives share a prefix.
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-- Consumes no input if all choices fail.
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choice' :: [TextParser m a] -> TextParser m a
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choice' = choice . map try
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-- | Backtracking choice, use this when alternatives share a prefix.
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-- Consumes no input if all choices fail.
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choiceInState :: [StateT s (ParsecT CustomErr Text m) a] -> StateT s (ParsecT CustomErr Text m) a
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choiceInState = choice . map try
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surroundedBy :: Applicative m => m openclose -> m a -> m a
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surroundedBy p = between p p
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parsewith :: Parsec e Text a -> Text -> Either (ParseErrorBundle Text e) a
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parsewith p = runParser p ""
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parsewithString
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:: Parsec e String a -> String -> Either (ParseErrorBundle String e) a
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parsewithString p = runParser p ""
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-- | Run a stateful parser with some initial state on a text.
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-- See also: runTextParser, runJournalParser.
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parseWithState
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:: Monad m
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=> st
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-> StateT st (ParsecT CustomErr Text m) a
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-> Text
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-> m (Either (ParseErrorBundle Text CustomErr) a)
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parseWithState ctx p s = runParserT (evalStateT p ctx) "" s
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parseWithState'
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:: (Stream s)
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=> st
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-> StateT st (ParsecT e s Identity) a
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-> s
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-> (Either (ParseErrorBundle s e) a)
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parseWithState' ctx p s = runParser (evalStateT p ctx) "" s
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fromparse
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:: (Show t, Show (Token t), Show e) => Either (ParseErrorBundle t e) a -> a
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fromparse = either parseerror id
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parseerror :: (Show t, Show (Token t), Show e) => ParseErrorBundle t e -> a
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parseerror e = error' $ showParseError e
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showParseError
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:: (Show t, Show (Token t), Show e)
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=> ParseErrorBundle t e -> String
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showParseError e = "parse error at " ++ show e
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showDateParseError
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:: (Show t, Show (Token t), Show e) => ParseErrorBundle t e -> String
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showDateParseError e = printf "date parse error (%s)" (intercalate ", " $ tail $ lines $ show e)
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nonspace :: TextParser m Char
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nonspace = satisfy (not . isSpace)
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isNonNewlineSpace :: Char -> Bool
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isNonNewlineSpace c = c /= '\n' && isSpace c
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spacenonewline :: (Stream s, Char ~ Token s) => ParsecT CustomErr s m Char
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spacenonewline = satisfy isNonNewlineSpace
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restofline :: TextParser m String
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restofline = anySingle `manyTill` newline
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eolof :: TextParser m ()
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eolof = (newline >> return ()) <|> eof
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