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User:Zzo38/Proposal for more-notation

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Revision as of 20:33, 27 August 2011

This document is proposal for more-notation in Haskell.


1 Syntax

Anywhere that a more-notation is allowed (see Uses), you can use the syntax:

  • more [(name_of_enumeration)] more_name {parameters}
  • name_of_enumeration: A name of any type which is an enumeration. It can be another one using more-notation, but it must be able to fully determine it before this more-notation can be fully determined.
  • more_name: A capitalized name. It uses the same namespace as constructors, so you are not allowed to have a constructor of the same name (although it is OK to have types of the that name).
  • parameters: Optional lowercased names. These names are in local scope, and may already exist in this scope, although they do not have to.

A more-declaration is a module-level declaration of this syntax:

  • [ numeric_literal | (enumeration_constructor) ] more_name {parameters} = contents { | contents } ;

2 Semantics

3 Uses

3.1 Do-blocks

3.2 Case alternatives

3.3 Datatype declarations

3.4 Fields in record syntax

3.5 Lists

4 Combining with Template Haskell

4.1 Uses in quotations

4.2 Manipulation in splices