goruby/goruby

package evaluator

import (
    "fmt"
    "go/token"

    "github.com/goruby/goruby/ast"
)

func wrapStack(err error, node, root ast.Node, file *token.File) error {
    return &stackError{
        underlyingError: err,
        node:            node,
        root:            root,
        file:            file,
    }
}

type stackError struct {
    underlyingError error
    node            ast.Node
    root            ast.Node
    file            *token.File
}

func (s *stackError) Cause() error {
    return s.underlyingError
}

func (s *stackError) Error() string {
    return s.underlyingError.Error()
}

func (s *stackError) buildStack() {
    path, ok := ast.Path(s.root, s.node)
    if !ok {
        return
    }
    for elem := path.Front(); elem != nil; elem = elem.Next() {
        n := elem.Value.(ast.Node)
        pos := s.file.Position(token.Pos(n.Pos()))
        fmt.Println(pos.String())
        fmt.Printf("Node: %#v\n", n)
        // ast.Print(nil, n)
    }
}