func (this *Mem) newCallTree(parentPatterns int, node *ifExprs) (*CallNode, error) {
if node.ret != nil {
ps := node.ret
zippedPatterns, zipper := zip(ps)
zipperIndex := this.zis.add(zipper)
stackElement := stackElm{
parentPatterns: parentPatterns,
childrenZipper: zipperIndex,
}
stackIndex := this.stackElms.add(stackElement)
zippedPatternIndex := this.patterns.add(zippedPatterns)
return &CallNode{
child: zippedPatternIndex,
stackIndex: stackIndex,
}, nil
}
then, err := this.newCallTree(parentPatterns, node.then)
if err != nil {
return nil, err
}
els, err := this.newCallTree(parentPatterns, node.els)
if err != nil {
return nil, err
}
f, err := compose.NewBoolFunc(node.cond)
if err != nil {
return nil, err
}
return &CallNode{
cond: f,
then: then,
els: els,
}, nil
}
//EvalName evaluates a name expression given a name value.
func EvalName(nameExpr *ast.NameExpr, name parser.Value) bool {
f := NameToFunc(nameExpr)
b, err := compose.NewBoolFunc(f)
if err != nil {
panic(err)
}
v, err := b.Eval(name)
if err != nil {
panic(err)
}
return v
}
func (this *ifExprs) eval(label parser.Value) ([]*ast.Pattern, error) {
if this.ret != nil {
return this.ret, nil
}
f, err := compose.NewBoolFunc(this.cond)
if err != nil {
return nil, err
}
cond, err := f.Eval(label)
if err != nil {
return nil, err
}
if cond {
return this.then.eval(label)
}
return this.els.eval(label)
}
func TestNoEqualError(t *testing.T) {
exprStr := Sprint(StringEq(ElemStrings(NewListOfString([]String{StringVar()}), IntConst(3)), StringConst("0123456789")))
t.Logf(exprStr)
e, err := parser.NewParser().ParseExpr(exprStr)
if err != nil {
t.Fatal(err)
}
b, err := compose.NewBool(e)
if err != nil {
t.Fatal(err)
}
f, err := compose.NewBoolFunc(b)
if err != nil {
t.Fatal(err)
}
if v, err := f.Eval(debug.NewStringValue("0")); err != nil {
t.Fatal(err)
} else if v {
t.Fatalf("expected false")
}
}
func derivCall(refs ast.RefLookup, p *ast.Pattern, label parser.Value) ([]*ast.Pattern, error) {
typ := p.GetValue()
switch v := typ.(type) {
case *ast.Empty:
return []*ast.Pattern{}, nil
case *ast.ZAny:
return []*ast.Pattern{}, nil
case *ast.TreeNode:
b := nameexpr.NameToFunc(v.GetName())
f, err := compose.NewBoolFunc(b)
if err != nil {
return nil, err
}
eval, err := f.Eval(label)
if err != nil {
return nil, err
}
if eval {
return []*ast.Pattern{v.GetPattern()}, nil
}
return []*ast.Pattern{ast.NewNot(ast.NewZAny())}, nil
case *ast.LeafNode:
b, err := compose.NewBool(v.GetExpr())
if err != nil {
return nil, err
}
f, err := compose.NewBoolFunc(b)
if err != nil {
return nil, err
}
eval, err := f.Eval(label)
if err != nil {
return nil, err
}
if eval {
return []*ast.Pattern{ast.NewEmpty()}, nil
}
return []*ast.Pattern{ast.NewNot(ast.NewZAny())}, nil
case *ast.Concat:
l, err := derivCall(refs, v.GetLeftPattern(), label)
if err != nil {
return nil, err
}
if !Nullable(refs, v.GetLeftPattern()) {
return l, nil
}
r, err := derivCall(refs, v.GetRightPattern(), label)
if err != nil {
return nil, err
}
return append(l, r...), nil
case *ast.Or:
return derivCall2(refs, v.GetLeftPattern(), v.GetRightPattern(), label)
case *ast.And:
return derivCall2(refs, v.GetLeftPattern(), v.GetRightPattern(), label)
case *ast.Interleave:
return derivCall2(refs, v.GetLeftPattern(), v.GetRightPattern(), label)
case *ast.ZeroOrMore:
return derivCall(refs, v.GetPattern(), label)
case *ast.Reference:
return derivCall(refs, refs[v.GetName()], label)
case *ast.Not:
return derivCall(refs, v.GetPattern(), label)
case *ast.Contains:
return derivCall(refs, ast.NewConcat(ast.NewZAny(), ast.NewConcat(v.GetPattern(), ast.NewZAny())), label)
case *ast.Optional:
return derivCall(refs, ast.NewOr(v.GetPattern(), ast.NewEmpty()), label)
}
panic(fmt.Sprintf("unknown pattern typ %T", typ))
}