// evaluates lambdas
func (scope *Scope) lambda(tree *ast.Tree, args []*ast.Tree) *ast.Tree {
sc := scope.childScope()
if len(tree.Sub[0].Sub) >= len(args) {
sc.Scope = append(sc.Scope, &variable.Var{
Var: "self",
Tree: ast.CopyTree(tree, new(ast.Tree)),
})
//return nil
for i := 0; i < len(tree.Sub[0].Sub); i++ {
// populate scope
sc.Scope = append(sc.Scope, &variable.Var{
Var: tree.Sub[0].Sub[i].Val.Var,
Tree: scope.eval(args[i]),
})
}
tr := sc.eval(tree.Sub[1])
if tr != nil {
return tr
} else {
return tree.Sub[1]
}
} else {
errorf("lambda: arg number incorrect")
return nil
}
}
func (scope *Scope) evalVar(tree *ast.Tree) *ast.Tree {
t := ((*variable.Scope)(scope)).GetName(tree.Val.Var)
if t != nil && t.Tree != nil {
return ast.CopyTree(t.Tree, new(ast.Tree))
} else {
return nil
}
}