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Merge branch 'master' of https://git.scc.kit.edu/pse-typinferenz/typicalc
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commit
9acc8fed98
@ -35,7 +35,7 @@ public class Substitution {
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/**
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* @return the replacement type
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*/
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Type getType() {
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public Type getType() {
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return b;
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}
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@ -3,7 +3,7 @@ package edu.kit.typicalc.model;
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import edu.kit.typicalc.model.type.Type;
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import edu.kit.typicalc.model.type.TypeVariable;
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import java.util.Collections;
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import java.util.ArrayList;
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import java.util.List;
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/**
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@ -12,6 +12,10 @@ import java.util.List;
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* accessed right after instantiation (no additional initialization is required).
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*/
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public class TypeInferenceResult {
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private final List<Substitution> MGU;
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private final Type finalType;
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/**
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* Initializes a new TypeInferenceResult for the given substitutions (resulting from
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* the unification) and the given type variable belonging to the original lambda term
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@ -22,7 +26,39 @@ public class TypeInferenceResult {
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* @param typeVar the type variable belonging to the original lambda term
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*/
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protected TypeInferenceResult(List<Substitution> substitutions, TypeVariable typeVar) {
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// TODO
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MGU = new ArrayList<>(substitutions);
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findMGU();
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finalType = findFinalType(typeVar);
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}
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private void findMGU() {
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for (int i = 0; i < MGU.size(); i++) {
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Substitution applySub = MGU.get(i);
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for (int j = 0; j < MGU.size(); j++) {
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Substitution toSub = MGU.get(j);
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if (i == j) {
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continue;
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} else if (applySub.getVariable().equals(toSub.getVariable())) {
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throw new IllegalStateException(
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"MGU cannot be calculated for two substitutions with same Variable:\n"
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+ applySub.toString() + "\n"
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+ toSub.toString());
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}
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Substitution resultSub = new Substitution(toSub.getVariable(), toSub.getType().substitute(applySub));
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MGU.set(j, resultSub);
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}
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}
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}
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private Type findFinalType(TypeVariable typeVar) {
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for (Substitution substitution : MGU) {
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if (substitution.getVariable().equals(typeVar)) {
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return substitution.getType();
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}
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}
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throw new IllegalStateException("MGU has to contain substitution for original type variable: "
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+ typeVar.toString());
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}
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/**
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@ -32,8 +68,7 @@ public class TypeInferenceResult {
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* @return the most general unifier, null if there is no valid mgu
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*/
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protected List<Substitution> getMGU() {
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return Collections.emptyList();
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// TODO
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return MGU;
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}
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/**
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@ -44,7 +79,6 @@ public class TypeInferenceResult {
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* @return the final type of the lambda term, null if there is no valid type
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*/
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protected Type getType() {
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return null;
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// TODO
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return finalType;
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}
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}
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@ -1,5 +1,6 @@
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package edu.kit.typicalc.model.type;
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import edu.kit.typicalc.model.Substitution;
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import edu.kit.typicalc.model.UnificationError;
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import edu.kit.typicalc.util.Result;
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@ -15,13 +16,22 @@ public abstract class Type {
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public abstract boolean contains(Type x);
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/**
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* Substitutes a type Variable for a different type
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* Substitutes a type Variable for a different type.
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* @param a the type to replace
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* @param b the type to insert
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* @return a Type that is created by replacing a with b
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*/
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public abstract Type substitute(TypeVariable a, Type b);
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/**
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* Applies the given substitution to the type.
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* @param substitution the substitution to apply to the type
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* @return the substituted type
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*/
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public Type substitute(Substitution substitution) {
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return substitute(substitution.getVariable(), substitution.getType());
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}
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/**
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* Accepts a visitor
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* @param typeVisitor the visitor that wants to visit this
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@ -0,0 +1,4 @@
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package edu.kit.typicalc.model;
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class TypeInferenceResultTest {
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}
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