Beispiel #1
0
func TestSimplifyTree(t *testing.T) {
	left := ast.NewTreeNode(ast.NewStringName("A"),
		ast.NewTreeNode(ast.NewStringName("B"), ast.NewContains(
			ast.NewTreeNode(ast.NewStringName("C"), ast.NewZAny()),
		)),
	)
	right := ast.NewTreeNode(ast.NewStringName("A"),
		ast.NewTreeNode(ast.NewStringName("B"), ast.NewContains(
			ast.NewTreeNode(ast.NewStringName("D"), ast.NewZAny()),
		)),
	)
	input := ast.NewAnd(left, right)
	expected := ast.NewTreeNode(ast.NewStringName("A"),
		ast.NewTreeNode(ast.NewStringName("B"), ast.NewAnd(
			ast.NewContains(
				ast.NewTreeNode(ast.NewStringName("C"), ast.NewZAny()),
			),
			ast.NewContains(
				ast.NewTreeNode(ast.NewStringName("D"), ast.NewZAny()),
			),
		)),
	)
	output := NewSimplifier(input.Grammar()).Simplify(input)
	t.Logf("%v", output)
	if !expected.Equal(output) {
		t.Fatalf("expected %v, but got %v", expected, output)
	}
}
Beispiel #2
0
func derivReturn(refs ast.RefLookup, p *ast.Pattern, patterns []*ast.Pattern) (*ast.Pattern, []*ast.Pattern) {
	typ := p.GetValue()
	switch v := typ.(type) {
	case *ast.Empty:
		return ast.NewNot(ast.NewZAny()), patterns
	case *ast.ZAny:
		return ast.NewZAny(), patterns
	case *ast.TreeNode:
		if Nullable(refs, patterns[0]) {
			return ast.NewEmpty(), patterns[1:]
		}
		return ast.NewNot(ast.NewZAny()), patterns[1:]
	case *ast.LeafNode:
		if Nullable(refs, patterns[0]) {
			return ast.NewEmpty(), patterns[1:]
		}
		return ast.NewNot(ast.NewZAny()), patterns[1:]
	case *ast.Concat:
		l, leftRest := derivReturn(refs, v.GetLeftPattern(), patterns)
		leftConcat := ast.NewConcat(l, v.GetRightPattern())
		if !Nullable(refs, v.GetLeftPattern()) {
			return leftConcat, leftRest
		}
		r, rightRest := derivReturn(refs, v.GetRightPattern(), leftRest)
		return ast.NewOr(leftConcat, r), rightRest
	case *ast.Or:
		l, leftRest := derivReturn(refs, v.GetLeftPattern(), patterns)
		r, rightRest := derivReturn(refs, v.GetRightPattern(), leftRest)
		return ast.NewOr(l, r), rightRest
	case *ast.And:
		l, leftRest := derivReturn(refs, v.GetLeftPattern(), patterns)
		r, rightRest := derivReturn(refs, v.GetRightPattern(), leftRest)
		return ast.NewAnd(l, r), rightRest
	case *ast.Interleave:
		l, leftRest := derivReturn(refs, v.GetLeftPattern(), patterns)
		r, rightRest := derivReturn(refs, v.GetRightPattern(), leftRest)
		return ast.NewOr(ast.NewInterleave(l, v.GetRightPattern()), ast.NewInterleave(r, v.GetLeftPattern())), rightRest
	case *ast.ZeroOrMore:
		c, rest := derivReturn(refs, v.GetPattern(), patterns)
		return ast.NewConcat(c, p), rest
	case *ast.Reference:
		return derivReturn(refs, refs[v.GetName()], patterns)
	case *ast.Not:
		c, rest := derivReturn(refs, v.GetPattern(), patterns)
		return ast.NewNot(c), rest
	case *ast.Contains:
		return derivReturn(refs, ast.NewConcat(ast.NewZAny(), ast.NewConcat(v.GetPattern(), ast.NewZAny())), patterns)
	case *ast.Optional:
		return derivReturn(refs, ast.NewOr(v.GetPattern(), ast.NewEmpty()), patterns)
	}
	panic(fmt.Sprintf("unknown pattern typ %T", typ))
}
Beispiel #3
0
func (this *nameToNumber) translate(context *context, p *ast.Pattern) (*ast.Pattern, error) {
	typ := p.GetValue()
	switch v := typ.(type) {
	case *ast.Empty, *ast.LeafNode, *ast.ZAny:
		return p, nil
	case *ast.TreeNode:
		return this.translateName(context, v.GetName(), v.GetPattern())
	case *ast.Concat:
		l, err1 := this.translate(context, v.GetLeftPattern())
		r, err2 := this.translate(context, v.GetRightPattern())
		return ast.NewConcat(l, r), anyErr(err1, err2)
	case *ast.Or:
		l, err1 := this.translate(context, v.GetLeftPattern())
		r, err2 := this.translate(context, v.GetRightPattern())
		return ast.NewOr(l, r), anyErr(err1, err2)
	case *ast.And:
		l, err1 := this.translate(context, v.GetLeftPattern())
		r, err2 := this.translate(context, v.GetRightPattern())
		return ast.NewAnd(l, r), anyErr(err1, err2)
	case *ast.ZeroOrMore:
		p, err := this.translate(context, v.GetPattern())
		return ast.NewZeroOrMore(p), err
	case *ast.Reference:
		c, ok := this.refs[v.GetName()]
		if !ok {
			this.refs[v.GetName()] = context
			return p, nil
		}
		if !c.Equal(context) {
			//TODO we could probably create a new reference here
			//  for every conflicting combination of msg x repeated x referece name
			return nil, &ErrDup{v.GetName(), c, context}
		}
		return p, nil
	case *ast.Not:
		p, err := this.translate(context, v.GetPattern())
		return ast.NewNot(p), err
	case *ast.Contains:
		p, err := this.translate(context, v.GetPattern())
		return ast.NewContains(p), err
	case *ast.Optional:
		p, err := this.translate(context, v.GetPattern())
		return ast.NewOptional(p), err
	case *ast.Interleave:
		l, err1 := this.translate(context, v.GetLeftPattern())
		r, err2 := this.translate(context, v.GetRightPattern())
		return ast.NewInterleave(l, r), anyErr(err1, err2)
	}
	panic(fmt.Sprintf("unknown pattern typ %T", typ))
}
Beispiel #4
0
func simplifyAnd(refs ast.RefLookup, p1, p2 *ast.Pattern, record bool) *ast.Pattern {
	if isNotZany(p1) || isNotZany(p2) {
		return emptyset
	}
	if isZany(p1) {
		return p2
	}
	if isZany(p2) {
		return p1
	}
	if isEmpty(p1) {
		if Nullable(refs, p2) {
			return ast.NewEmpty()
		} else {
			return emptyset
		}
	}
	if isEmpty(p2) {
		if Nullable(refs, p1) {
			return ast.NewEmpty()
		} else {
			return emptyset
		}
	}
	if p1.GetLeafNode() != nil && p2.GetLeafNode() != nil {
		expr1, err1 := compose.ConvertBuiltInIntoFunction(p1.GetLeafNode().GetExpr())
		expr2, err2 := compose.ConvertBuiltInIntoFunction(p2.GetLeafNode().GetExpr())
		if err1 == nil && err2 == nil {
			return ast.NewLeafNode(ast.NewFunction("and", expr1, expr2))
		}
	}
	left := getAnds(p1)
	right := getAnds(p2)
	list := append(left, right...)
	list = ast.Set(list)
	list = simplifyChildren(list, func(left, right *ast.Pattern) *ast.Pattern {
		return simplifyAnd(refs, left, right, record)
	}, record)
	ast.Sort(list)
	var p *ast.Pattern = list[0]
	for i := range list {
		if i == 0 {
			continue
		}
		p = ast.NewAnd(p, list[i])
	}
	return p
}
Beispiel #5
0
func TestSimplifyRecordLeaf2(t *testing.T) {
	input := ast.NewAnd(
		ast.NewContains(ast.NewTreeNode(ast.NewStringName("A"), ast.NewContains(ast.NewTreeNode(ast.NewStringName("B"), combinator.Value(funcs.Contains(funcs.StringVar(), funcs.StringConst("a"))))))),
		ast.NewContains(ast.NewTreeNode(ast.NewStringName("A"), ast.NewContains(ast.NewTreeNode(ast.NewStringName("B"), combinator.Value(funcs.Contains(funcs.StringVar(), funcs.StringConst("b"))))))),
	)
	t.Logf("input: %v", input)
	expected := ast.NewContains(ast.NewTreeNode(ast.NewStringName("A"), ast.NewContains(ast.NewTreeNode(ast.NewStringName("B"), combinator.Value(funcs.And(
		funcs.Contains(funcs.StringVar(), funcs.StringConst("a")),
		funcs.Contains(funcs.StringVar(), funcs.StringConst("b")),
	))))))
	output := NewSimplifier(input.Grammar()).OptimizeForRecord().Simplify(input)
	expected.Format()
	output.Format()
	t.Logf("%v", output)
	if !expected.Equal(output) {
		t.Fatalf("expected %v, but got %v", expected, output)
	}
}