Module "ReadNumeric.curry"

Library with some functions for reading and converting numeric tokens.

Author: Michael Hanus, Frank Huch

Version: September 2006

Functions:
readHex | readInt | readNat | readOct

readInt  :: String -> Maybe (Int,String)              Read a (possibly negative) integer as a first token in a string.

readNat  :: String -> Maybe (Int,String)              Read a natural number as a first token in a string.

readHex  :: String -> Maybe (Int,String)              Read a hexadecimal number as a first token in a string.

readOct  :: String -> Maybe (Int,String)              Read an octal number as a first token in a string.

Read a (possibly negative) integer as a first token in a string. The string might contain leadings blanks and the integer is read up to the first non-digit. If the string does not start with an integer token, Nothing is returned, otherwise the result is (Just (v,s)) where v is the value of the integer and s is the remaing string without the integer token.

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readNat :: String -> Maybe (Int,String)   

Read a natural number as a first token in a string. The string might contain leadings blanks and the number is read up to the first non-digit. If the string does not start with a natural number token, Nothing is returned, otherwise the result is (Just (v,s)) where v is the value of the number and s is the remaing string without the number token.

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readHex :: String -> Maybe (Int,String)   

Read a hexadecimal number as a first token in a string. The string might contain leadings blanks and the number is read up to the first non-hexadecimal digit. If the string does not start with a hexadecimal number token, Nothing is returned, otherwise the result is (Just (v,s)) where v is the value of the number and s is the remaing string without the number token.

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readOct :: String -> Maybe (Int,String)   

Read an octal number as a first token in a string. The string might contain leadings blanks and the number is read up to the first non-octal digit. If the string does not start with an octal number token, Nothing is returned, otherwise the result is (Just (v,s)) where v is the value of the number and s is the remaing string without the number token.

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