base-4.7.0.0: Basic libraries

Copyright	(c) The University of Glasgow 2002
License	BSD-style (see the file libraries/base/LICENSE)
Maintainer	libraries@haskell.org
Stability	provisional
Portability	non-portable (uses Text.ParserCombinators.ReadP)
Safe Haskell	Trustworthy
Language	Haskell2010

Text.Read.Lex

Description

The cut-down Haskell lexer, used by Text.Read

Synopsis

Documentation

data Lexeme Source

Haskell lexemes.

Constructors

Char Char	Character literal
String String	String literal, with escapes interpreted
Punc String	Punctuation or reserved symbol, e.g. `(`, `::`
Ident String	Haskell identifier, e.g. `foo`, `Baz`
Symbol String	Haskell symbol, e.g. `>>`, `:%`
Number Number	Since: 4.6.0.0
EOF

Instances

Eq Lexeme
Read Lexeme
Show Lexeme

data Number Source

Since: 4.7.0.0

Instances

Eq Number
Show Number

numberToInteger ∷ Number → Maybe Integer Source

Since: 4.5.1.0

numberToFixed ∷ Integer → Number → Maybe (Integer, Integer) Source

Since: 4.7.0.0

numberToRational ∷ Number → Rational Source

Since: 4.6.0.0

numberToRangedRational ∷ (Int, Int) → Number → Maybe Rational Source

Since: 4.5.1.0

lex ∷ ReadP Lexeme Source

expect ∷ Lexeme → ReadP () Source

Since: 4.7.0.0

hsLex ∷ ReadP String Source

Haskell lexer: returns the lexed string, rather than the lexeme

lexChar ∷ ReadP Char Source

readIntP ∷ Num a ⇒ a → (Char → Bool) → (Char → Int) → ReadP a Source

readOctP ∷ (Eq a, Num a) ⇒ ReadP a Source

readDecP ∷ (Eq a, Num a) ⇒ ReadP a Source

readHexP ∷ (Eq a, Num a) ⇒ ReadP a Source