public static IFeatureStructSyntax NewMutable(FeatureSystem featSys, FeatureStruct fs)
{
return(new FeatureStructBuilder(featSys, fs.DeepClone(), true));
}
public static IFeatureStructSyntax NewMutable(FeatureSystem featSys)
{
return(new FeatureStructBuilder(featSys, true));
}
public static IFeatureStructSyntax New(FeatureSystem featSys)
{
return(new FeatureStructBuilder(featSys));
}
private void TestBinaryOperation <TResult>(IEqualityComparer <TResult> comparer, Func <FeatureStruct, FeatureStruct, TResult> resultsSelector,
Func <FeatureStruct, FeatureStruct, VariableBindings, TResult> varResultsSelector, params Func <FeatureSystem, TResult>[] expectedSelectors)
{
// simple
var featSys = new FeatureSystem
{
new SymbolicFeature("a", new FeatureSymbol("a1"), new FeatureSymbol("a2"), new FeatureSymbol("a3")),
new SymbolicFeature("b", new FeatureSymbol("b1"), new FeatureSymbol("b2"), new FeatureSymbol("b3")),
new SymbolicFeature("c", new FeatureSymbol("c1"), new FeatureSymbol("c2"), new FeatureSymbol("c3"))
};
featSys.Freeze();
FeatureStruct fs1 = FeatureStruct.NewMutable(featSys).Symbol("a1").Symbol("b1").Value;
FeatureStruct fs2 = FeatureStruct.NewMutable(featSys).Symbol("a2").Symbol("c2").Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[0](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Symbol("a1", "a2").Symbol("b1").Symbol("c2").Value;
fs2 = FeatureStruct.NewMutable(featSys).Symbol("a2").Symbol("c2").Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[1](featSys)).Using(comparer));
// complex
featSys = new FeatureSystem
{
new ComplexFeature("cx1"),
new SymbolicFeature("a", new FeatureSymbol("a1"), new FeatureSymbol("a2"), new FeatureSymbol("a3")),
new ComplexFeature("cx2"),
new SymbolicFeature("b", new FeatureSymbol("b1"), new FeatureSymbol("b2"), new FeatureSymbol("b3")),
new ComplexFeature("cx3"),
new SymbolicFeature("c", new FeatureSymbol("c1"), new FeatureSymbol("c2"), new FeatureSymbol("c3")),
new ComplexFeature("cx4"),
new SymbolicFeature("d", new FeatureSymbol("d1"), new FeatureSymbol("d2"), new FeatureSymbol("d3"))
};
featSys.Freeze();
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a1"))
.Feature("cx2").EqualTo(cx2 => cx2.Symbol("b1"))
.Feature("cx4").EqualTo(cx4 => cx4.Symbol("d1")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a2"))
.Feature("cx3").EqualTo(cx2 => cx2.Symbol("c2"))
.Feature("cx4").EqualTo(cx4 => cx4.Symbol("d2", "d3")).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[2](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a1", "a2"))
.Feature("cx2").EqualTo(cx2 => cx2.Symbol("b1"))
.Feature("cx4").EqualTo(cx4 => cx4.Symbol("d1")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a2"))
.Feature("cx3").EqualTo(cx2 => cx2.Symbol("c2"))
.Feature("cx4").EqualTo(cx4 => cx4.Symbol("d1", "d2")).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[3](featSys)).Using(comparer));
// re-entrant
featSys = new FeatureSystem
{
new ComplexFeature("cx1"),
new SymbolicFeature("a", new FeatureSymbol("a1"), new FeatureSymbol("a2"), new FeatureSymbol("a3"), new FeatureSymbol("a4")),
new ComplexFeature("cx2")
};
featSys.Freeze();
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1"))
.Feature("cx2").ReferringTo(1).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(cx2 => cx2.Symbol("a2")).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[4](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a1", "a2")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(1, cx2 => cx2.Symbol("a1", "a3"))
.Feature("cx1").ReferringTo(1).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[5](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a1", "a2")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(cx2 => cx2.Symbol(1, "a1", "a3"))
.Feature("cx1").EqualTo(cx1 => cx1.Feature("a").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[6](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1"))
.Feature("cx2").ReferringTo(1).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(1, cx2 => cx2.Symbol("a1", "a2"))
.Feature("cx1").ReferringTo(1).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[7](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1", "a2"))
.Feature("cx2").ReferringTo(1).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(1, cx2 => cx2.Symbol("a2", "a3", "a4"))
.Feature("cx1").ReferringTo(1).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[8](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol(1, "a1", "a2"))
.Feature("cx2").EqualTo(cx2 => cx2.Feature("a").ReferringTo(1)).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(cx2 => cx2.Symbol(1, "a2", "a3", "a4"))
.Feature("cx1").EqualTo(cx1 => cx1.Feature("a").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[9](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a1", "a2")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(1, cx2 => cx2.Symbol("a3"))
.Feature("cx1").ReferringTo(1).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[10](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1"))
.Feature("cx2").ReferringTo(1).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx2").EqualTo(1, cx2 => cx2.Symbol("a2", "a3", "a4"))
.Feature("cx1").ReferringTo(1).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[11](featSys)).Using(comparer));
// cyclic
featSys = new FeatureSystem
{
new ComplexFeature("cx1"),
new SymbolicFeature("a", new FeatureSymbol("a1"), new FeatureSymbol("a2"), new FeatureSymbol("a3")),
new SymbolicFeature("b", new FeatureSymbol("b1"), new FeatureSymbol("b2"), new FeatureSymbol("b3")),
new SymbolicFeature("c", new FeatureSymbol("c1"), new FeatureSymbol("c2"), new FeatureSymbol("c3")),
new ComplexFeature("cx2")
};
featSys.Freeze();
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1
.Symbol("a1").Symbol("b1")).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Feature("cx2").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[12](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a1", "a2").Feature("cx2").ReferringTo(1)).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1
.Symbol("a2").Symbol("b2")).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[13](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1
.Symbol("a1", "a2").Symbol("b1").Feature("cx2").EqualTo(cx2 => cx2.Symbol("c1"))).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Feature("cx2").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[14](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(cx1 => cx1
.Symbol("a1").Symbol("b1").Feature("cx2").EqualTo(cx2 => cx2.Symbol("c1", "c2"))).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Symbol("c2").Feature("cx2").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[15](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a1").Symbol("b1").Symbol("c1").Feature("cx2").ReferringTo(1)).Value;
fs2 = FeatureStruct.NewMutable(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Symbol("c2").Feature("cx2").ReferringTo(1)).Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[16](featSys)).Using(comparer));
// variable
featSys = new FeatureSystem
{
new SymbolicFeature("a", new FeatureSymbol("a+", "+"), new FeatureSymbol("a-", "-")),
new SymbolicFeature("b", new FeatureSymbol("b+", "+"), new FeatureSymbol("b-", "-"))
};
featSys.Freeze();
fs1 = FeatureStruct.NewMutable(featSys)
.Feature("a").EqualToVariable("var1")
.Symbol("b-").Value;
fs2 = FeatureStruct.NewMutable(featSys)
.Feature("a").Not.EqualToVariable("var1")
.Symbol("b-").Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[17](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys)
.Feature("a").EqualToVariable("var1")
.Symbol("b-").Value;
fs2 = FeatureStruct.NewMutable(featSys)
.Symbol("a+")
.Symbol("b-").Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[18](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys)
.Symbol("a+")
.Symbol("b-").Value;
fs2 = FeatureStruct.NewMutable(featSys)
.Feature("a").Not.EqualToVariable("var1")
.Symbol("b-").Value;
Assert.That(resultsSelector(fs1, fs2), Is.EqualTo(expectedSelectors[19](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys)
.Symbol("a+")
.Symbol("b-").Value;
fs2 = FeatureStruct.NewMutable(featSys)
.Feature("a").Not.EqualToVariable("var1")
.Symbol("b-").Value;
var varBindings = new VariableBindings();
varBindings["var1"] = new SymbolicFeatureValue(featSys.GetSymbol("a-"));
Assert.That(varResultsSelector(fs1, fs2, varBindings), Is.EqualTo(expectedSelectors[20](featSys)).Using(comparer));
fs1 = FeatureStruct.NewMutable(featSys)
.Symbol("a+")
.Symbol("b-").Value;
fs2 = FeatureStruct.NewMutable(featSys)
.Feature("a").Not.EqualToVariable("var1")
.Symbol("b-").Value;
varBindings = new VariableBindings();
varBindings["var1"] = new SymbolicFeatureValue(featSys.GetSymbol("a+"));
Assert.That(varResultsSelector(fs1, fs2, varBindings), Is.EqualTo(expectedSelectors[21](featSys)).Using(comparer));
}
public void Unify()
{
Func <FeatureStruct, FeatureStruct, FeatureStruct> resultsSelector = (fs1, fs2) =>
{
FeatureStruct res;
return(fs1.Unify(fs2, out res) ? res : null);
};
Func <FeatureStruct, FeatureStruct, VariableBindings, FeatureStruct> varResultsSelector = (fs1, fs2, varBindings) =>
{
FeatureStruct res;
return(fs1.Unify(fs2, varBindings, out res) ? res : null);
};
TestBinaryOperation(FreezableEqualityComparer <FeatureStruct> .Default, resultsSelector, varResultsSelector,
// simple
featSys => null,
featSys => FeatureStruct.New(featSys).Symbol("a2").Symbol("b1").Symbol("c2").Value,
// complex
featSys => null,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol("a2"))
.Feature("cx2").EqualTo(cx2 => cx2.Symbol("b1"))
.Feature("cx3").EqualTo(cx2 => cx2.Symbol("c2"))
.Feature("cx4").EqualTo(cx4 => cx4.Symbol("d1")).Value,
// re-entrant
featSys => null,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1"))
.Feature("cx2").ReferringTo(1).Value,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol(1, "a1"))
.Feature("cx2").EqualTo(cx2 => cx2.Feature("a").ReferringTo(1)).Value,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a1"))
.Feature("cx2").ReferringTo(1).Value,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(1, cx1 => cx1.Symbol("a2"))
.Feature("cx2").ReferringTo(1).Value,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(cx1 => cx1.Symbol(1, "a2"))
.Feature("cx2").EqualTo(cx2 => cx2.Feature("a").ReferringTo(1)).Value,
featSys => null,
featSys => null,
// cyclic
featSys => null,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Symbol("b2").Feature("cx2").ReferringTo(1)).Value,
featSys => FeatureStruct.New(featSys).Feature("cx1").EqualTo(1, cx1 => cx1
.Symbol("a2").Symbol("b1").Symbol("c1").Feature("cx2").ReferringTo(1)).Value,
featSys => null,
featSys => null,
// variable
featSys => null,
featSys => FeatureStruct.New(featSys).Symbol("a+").Symbol("b-").Value,
featSys => FeatureStruct.New(featSys).Symbol("a+").Symbol("b-").Value,
featSys => FeatureStruct.New(featSys).Symbol("a+").Symbol("b-").Value,
featSys => null);
var featureSystem = new FeatureSystem
{
new ComplexFeature("a"),
new SymbolicFeature("b", new FeatureSymbol("c")),
new ComplexFeature("d"),
new SymbolicFeature("e", new FeatureSymbol("f")),
new ComplexFeature("g"),
new SymbolicFeature("h", new FeatureSymbol("j"))
};
FeatureStruct featStruct1 = FeatureStruct.New(featureSystem)
.Feature("a").EqualTo(a => a
.Feature("b").EqualTo("c"))
.Feature("d").EqualTo(1, d => d
.Feature("e").EqualTo("f"))
.Feature("g").ReferringTo(1).Value;
FeatureStruct featStruct2 = FeatureStruct.New(featureSystem)
.Feature("a").EqualTo(1, a => a
.Feature("b").EqualTo("c"))
.Feature("d").ReferringTo(1)
.Feature("g").EqualTo(g => g
.Feature("h").EqualTo("j")).Value;
FeatureStruct result;
Assert.IsTrue(featStruct1.Unify(featStruct2, out result));
featureSystem = new FeatureSystem
{
new ComplexFeature("a"),
new SymbolicFeature("b", new FeatureSymbol("c")),
new ComplexFeature("d"),
new SymbolicFeature("e", new FeatureSymbol("f")),
new ComplexFeature("g"),
new SymbolicFeature("h", new FeatureSymbol("j")),
new ComplexFeature("i")
};
featStruct1 = FeatureStruct.New(featureSystem)
.Feature("a").EqualTo(1, a => a
.Feature("b").EqualTo("c"))
.Feature("d").EqualTo(2, d => d
.Feature("e").EqualTo("f"))
.Feature("g").ReferringTo(2)
.Feature("i").ReferringTo(1).Value;
featStruct2 = FeatureStruct.New(featureSystem)
.Feature("a").EqualTo(1, a => a
.Feature("b").EqualTo("c"))
.Feature("d").EqualTo(g => g
.Feature("h").EqualTo("j"))
.Feature("g").ReferringTo(1).Value;
Assert.That(featStruct1.Unify(featStruct2, out result), Is.True);
Assert.That(result, Is.EqualTo(FeatureStruct.New(featureSystem)
.Feature("a").EqualTo(1, a => a
.Feature("b").EqualTo("c")
.Feature("e").EqualTo("f")
.Feature("h").EqualTo("j"))
.Feature("d").ReferringTo(1)
.Feature("g").ReferringTo(1)
.Feature("i").ReferringTo(1).Value).Using(FreezableEqualityComparer <FeatureStruct> .Default));
}
public static IFeatureStructSyntax New(FeatureSystem featSys, FeatureStruct fs)
{
return(new FeatureStructBuilder(featSys, fs.Clone()));
}