Module
Text.Parsing.Parser.Token
- Package
- purescript-parsing
- Repository
- purescript-contrib/purescript-parsing
Functions for working with streams of tokens.
#LanguageDef Source
type LanguageDef = GenLanguageDef String Identity
#GenLanguageDef Source
newtype GenLanguageDef s m
The GenLanguageDef
type is a record that contains all parameterizable
features of the "Text.Parsec.Token" module. The module Text.Parsec.Language
contains some default definitions.
Constructors
LanguageDef { caseSensitive :: Boolean, commentEnd :: String, commentLine :: String, commentStart :: String, identLetter :: ParserT s m Char, identStart :: ParserT s m Char, nestedComments :: Boolean, opLetter :: ParserT s m Char, opStart :: ParserT s m Char, reservedNames :: Array String, reservedOpNames :: Array String }
#unGenLanguageDef Source
unGenLanguageDef :: forall m s. GenLanguageDef s m -> { caseSensitive :: Boolean, commentEnd :: String, commentLine :: String, commentStart :: String, identLetter :: ParserT s m Char, identStart :: ParserT s m Char, nestedComments :: Boolean, opLetter :: ParserT s m Char, opStart :: ParserT s m Char, reservedNames :: Array String, reservedOpNames :: Array String }
#TokenParser Source
type TokenParser = GenTokenParser String Identity
#GenTokenParser Source
type GenTokenParser s m = { angles :: forall a. ParserT s m a -> ParserT s m a, braces :: forall a. ParserT s m a -> ParserT s m a, brackets :: forall a. ParserT s m a -> ParserT s m a, charLiteral :: ParserT s m Char, colon :: ParserT s m String, comma :: ParserT s m String, commaSep :: forall a. ParserT s m a -> ParserT s m (List a), commaSep1 :: forall a. ParserT s m a -> ParserT s m (List a), decimal :: ParserT s m Int, dot :: ParserT s m String, float :: ParserT s m Number, hexadecimal :: ParserT s m Int, identifier :: ParserT s m String, integer :: ParserT s m Int, lexeme :: forall a. ParserT s m a -> ParserT s m a, natural :: ParserT s m Int, naturalOrFloat :: ParserT s m (Either Int Number), octal :: ParserT s m Int, operator :: ParserT s m String, parens :: forall a. ParserT s m a -> ParserT s m a, reserved :: String -> ParserT s m Unit, reservedOp :: String -> ParserT s m Unit, semi :: ParserT s m String, semiSep :: forall a. ParserT s m a -> ParserT s m (List a), semiSep1 :: forall a. ParserT s m a -> ParserT s m (List a), stringLiteral :: ParserT s m String, symbol :: String -> ParserT s m String, whiteSpace :: ParserT s m Unit }
The type of the record that holds lexical parsers that work on
s
streams over a monad m
.
#makeTokenParser Source
makeTokenParser :: forall m. Monad m => GenLanguageDef String m -> GenTokenParser String m
The expression makeTokenParser language
creates a GenTokenParser
record that contains lexical parsers that are
defined using the definitions in the language
record.
The use of this function is quite stylized - one imports the
appropiate language definition and selects the lexical parsers that
are needed from the resulting GenTokenParser
.
module Main where
import Text.Parsing.Parser.Language (haskellDef)
import Text.Parsing.Parser.Token (makeTokenParser)
-- The parser
expr = parens expr
<|> identifier
<|> ...
-- The lexer
tokenParser = makeTokenParser haskellDef
parens = tokenParser.parens
braces = tokenParser.braces
identifier = tokenParser.identifier
reserved = tokenParser.reserved
...