wytp.proof.util

Class DeltaProof.State

java.lang.Object

wytp.proof.util.AbstractProof.AbstractState<DeltaProof.State>

wytp.proof.util.DeltaProof.State

All Implemented Interfaces:

Proof.State

Enclosing class:

DeltaProof

public static class DeltaProof.State
extends AbstractProof.AbstractState<DeltaProof.State>

Field Summary

Fields inherited from class wytp.proof.util.AbstractProof.AbstractState

children, dependencies, parent, proof, rule

Constructor Summary

Constructors

Constructor and Description
State(DeltaProof proof, Formula axiom)

Method Summary

Modifier and Type	Method and Description
Formula	allocate(Formula truth) Ensure a given formula is properly allocated into this state.
Proof.Delta	getDelta() Return the list of formulae introduced by this step.
Proof.Delta	getDelta(Proof.State ancestor) Return the list of formulae introduced by this step.
TypeInferer.Environment	getTypeEnvironment() Get the typing environment at this state in a given proof.
DeltaProof.State	infer(Proof.Rule rule, Formula truth, Formula... dependencies) Infer a new fact from one or more existing facts.
boolean	isKnown(Formula truth) Determine whether a given truth is known or not.
Proof.State	refine(Proof.Rule rule, WyalFile.VariableDeclaration variable, WyalFile.Type type, Formula... dependencies) Refine the type of a given variable in this state.
DeltaProof.State[]	split(Formula.Disjunct disjunct) Apply a simple proof step which splits a given disjunct into several sub-states.
DeltaProof.State	subsume(Proof.Rule rule, Formula from, Formula to, Formula... deps) Subume one formula with one or more formulae.

Methods inherited from class wytp.proof.util.AbstractProof.AbstractState

applyBypass, getChild, getDependencies, getParent, getProof, getRule, numberOfChildren

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

State

public State(DeltaProof proof,
             Formula axiom)

Method Detail

getDelta

public Proof.Delta getDelta()

Return the list of formulae introduced by this step.

Returns:

getDelta

public Proof.Delta getDelta(Proof.State ancestor)

Return the list of formulae introduced by this step.

Returns:

isKnown

public boolean isKnown(Formula truth)

Determine whether a given truth is known or not.

Parameters:

truth -

Returns:

getTypeEnvironment

public TypeInferer.Environment getTypeEnvironment()

Description copied from interface: Proof.State

Get the typing environment at this state in a given proof. The type environment gives the current type for all declared variables. The environment is not static as the type of a given variable can be refined at any given state as more facts become known.

Returns:

subsume

public DeltaProof.State subsume(Proof.Rule rule,
                                Formula from,
                                Formula to,
                                Formula... deps)

Subume one formula with one or more formulae. This implication is that latter "cover" the former. The former is no longer active, though it remains a known truth. The new formula are active.

Parameters:

from -

to -

Returns:

infer

public DeltaProof.State infer(Proof.Rule rule,
                              Formula truth,
                              Formula... dependencies)

Description copied from interface: Proof.State

Infer a new fact from one or more existing facts.

Returns:

split

public DeltaProof.State[] split(Formula.Disjunct disjunct)

Description copied from interface: Proof.State

Apply a simple proof step which splits a given disjunct into several sub-states.

Returns:

refine

public Proof.State refine(Proof.Rule rule,
                          WyalFile.VariableDeclaration variable,
                          WyalFile.Type type,
                          Formula... dependencies)

Description copied from interface: Proof.State

Refine the type of a given variable in this state. That is, make the type more precise at this point.

Parameters:

rule - The rule which is causing this particular refinement.

variable - The variable whose type is being refined.

type - The type which this variable is refined with.

dependencies - The immediate dependencies needed to establish this refinement.

Returns:

allocate

public Formula allocate(Formula truth)

Description copied from interface: Proof.State

Ensure a given formula is properly allocated into this state.

Returns: