Text.XML.HaXml.Xtract.Lex

HaXml-1.20.2: Utilities for manipulating XML documents

Text.XML.HaXml.Xtract.Lex

Description

This is another hand-written lexer, this time for the Xtract command-language. The entry point is lexXtract. You don't normally need to use this module directly - the lexer is called automatically by the parser. (We only expose this interface for debugging purposes.)

The Xtract command language is very like the XPath specification.

Synopsis

- lexXtract :: (String -> String) -> String -> [Token]
- data Posn = Pn Int
- data TokenT
  - = Symbol String
  - | TokString String
  - | TokNum Integer
- type Token = Either String (Posn, TokenT)

# Documentation

lexXtract :: (String -> String) -> String -> [Token]

First argument is a transformer for pattern strings, e.g. map toLower, but only applying to parts of the pattern not in quotation marks. (Needed to canonicalise HTML where tags are case-insensitive, but attribute values are case sensitive.)

data Posn

Constructors

Pn Int |

Instances

Eq Posn |
Show Posn |

data TokenT

Constructors

Symbol String |
TokString String |
TokNum Integer |

Instances

Eq TokenT |
Show TokenT |

type Token = Either String (Posn, TokenT)