| Portability | portable |
|---|---|
| Stability | experimental |
| Maintainer | Uwe Schmidt (uwe@fh-wedel.de) |
Text.XML.HXT.DTDValidation.XmlRE
Description
A module for regular expression matching, adapted for XML DTDs.
This module is based on the module RE.
- data RE a
- checkRE :: Show a => RE a -> String
- matches :: RE String -> XmlTrees -> RE String
- printRE :: Show a => RE a -> String
- re_unit :: RE a
- re_zero :: String -> RE a
- re_sym :: a -> RE a
- re_rep :: RE a -> RE a
- re_plus :: RE a -> RE a
- re_opt :: RE a -> RE a
- re_seq :: RE a -> RE a -> RE a
- re_alt :: RE a -> RE a -> RE a
- re_dot :: RE a
Documentation
checkRE :: Show a => RE a -> StringSource
Checks if an input matched a regular expression. The function should be called after matches.
Was the sentence used in matches in the language of the regular expression?
-> matches e s == s `in` L(e)?
- 1.parameter re : the derived regular expression
- returns : empty String if input matched the regular expression, otherwise an error message is returned
matches :: RE String -> XmlTrees -> RE StringSource
Derives a regular expression with respect to a list of elements.
- 1.parameter re : regular expression
- 2.parameter list : list of elements to which the regular expression is applied
- returns : the derived regular expression
printRE :: Show a => RE a -> StringSource
Constructs a string representation of a regular expression.
- 1.parameter re : a regular expression
- returns : the string representation of the regular expression
Constructs a regular expression for an empty sequence.
- returns : regular expression for an empty sequence
re_zero :: String -> RE aSource
Constructs a regular expression for an empty set.
- 1.parameter errMsg : error message
- returns : regular expression for an empty set
Constructs a regular expression for accepting a symbol
- 1.parameter sym : the symbol to be accepted
- returns : regular expression for accepting a symbol
Constructs an optional repetition (*) of a regular expression
- 1.parameter re_a : regular expression to be repeted
- returns : new regular expression
Constructs a repetition (+) of a regular expression
- 1.parameter re_a : regular expression to be repeted
- returns : new regular expression
Constructs an option (?) of a regular expression
- 1.parameter re_a : regular expression to be optional
- returns : new regular expression
re_seq :: RE a -> RE a -> RE aSource
Constructs a sequence (,) of two regular expressions
- 1.parameter re_a : first regular expression in sequence
- 2.parameter re_b : second regular expression in sequence
- returns : new regular expression