Difference between pages "Mathematical Extensions" and "Help:Assigning permissions"

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imported>Nicolas
 
(yiInRYSih)
 
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Currently the operators and basic predicates of the Event-B mathematical language supported by Rodin are fixed.
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We propose to extend Rodin to support user-defined data types and associated operators including
 
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inductive data types.  Users will be able to define operators of
 
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polymorphic type as well as parameterised predicate definitions.
 
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Details of the proposal may be found in this report : [http://deploy-eprints.ecs.soton.ac.uk/80 Proposals for Mathematical Extensions for Event-B]
 
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The proposal consists of considering three kinds of extension:
 
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# Extensions of set-theoretic expressions or predicates: example extensions of this kind consist of adding the transitive closure of relations or various ordered relations.
 
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# Extensions of the library of theorems for predicates and operators.
 
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# Extensions of the Set Theory itself through the definition of algebraic types such as  lists or ordered trees using new set constructors.
 
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== Towards a generic AST ==
 
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The following AST parts are to become generic, or at least parameterised:
 
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* Lexer
 
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* [[Constrained Dynamic Parser|Parser]]
 
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* Nodes ( Formula class hierarchy ): parameters needed for:
 
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** Type Solve (type rule needed to synthesize the type)
 
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** Type Check (type rule needed to verify constraints on children types)
 
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** WD (WD predicate)
 
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** PrettyPrint (tag image + notation (prefix, infix, postfix))
 
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** Visit Formula (getting children + visitor callback mechanism)
 
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** Rewrite Formula (associative formulæ have a specific flattening treatment)
 
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* Types (Type class hierarchy): parameters needed for:
 
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** Building the type expression (type rule needed)
 
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** PrettyPrint (set operator image)
 
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** getting Base / Source / Target type (type rule needed)
 
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* Formula Factory
 
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== Impact on other tools ==
 
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Impacted plug-ins (use a factory to build formulæ):
 
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* org.eventb.core
 
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* org.eventb.core.seqprover
 
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* org.eventb.pp
 
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* org.eventb.pptrans
 
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* org.eventb.ui
 
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[[Category:Design proposal]]
 

Revision as of 07:57, 10 August 2008

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