Golang Value.Class方法代码示例

func formatOneLine(v otto.Value, limit int, seen map[otto.Value]bool) (string, error) {
	if limit == 0 {
		return "...", nil
	}

	switch {
	case v.IsBoolean(), v.IsNull(), v.IsNumber(), v.IsUndefined():
		return v.String(), nil
	case v.IsString():
		return fmt.Sprintf("%q", v.String()), nil
	case v.IsFunction():
		n, err := v.Object().Get("name")
		if err != nil {
			return "", err
		}
		if n.IsUndefined() {
			return "function", nil
		}
		return fmt.Sprintf("function %s", n.String()), nil
	case v.IsObject():
		switch v.Class() {
		case "Array":
			return formatArrayOneLine(v, limit, seen)
		default:
			return formatObjectOneLine(v, limit, seen)
		}
	default:
		return "", fmt.Errorf("couldn't format type %s", v.Class())
	}
}

// Converts an Otto value to a Go value. Handles all JSON-compatible types.
func ottoToGo(value otto.Value) (interface{}, error) {
	if value.IsBoolean() {
		return value.ToBoolean()
	} else if value.IsNull() || value.IsUndefined() {
		return nil, nil
	} else if value.IsNumber() {
		return value.ToFloat()
	} else if value.IsString() {
		return value.ToString()
	} else {
		switch value.Class() {
		case "Array":
			return ottoToGoArray(value.Object())
		}
	}
	return nil, fmt.Errorf("Unsupported Otto value: %v", value)
}

func buildIteratorFromValue(val otto.Value, ts graph.TripleStore) graph.Iterator {
	if val.IsNull() || val.IsUndefined() {
		return ts.GetNodesAllIterator()
	}
	if val.IsPrimitive() {
		thing, _ := val.Export()
		switch v := thing.(type) {
		case string:
			it := ts.MakeFixed()
			it.AddValue(ts.GetIdFor(v))
			return it
		default:
			glog.Errorln("Trying to build unknown primitive value.")
		}
	}
	switch val.Class() {
	case "Object":
		return buildIteratorTree(val.Object(), ts)
	case "Array":
		// Had better be an array of strings
		strings := makeListOfStringsFromArrayValue(val.Object())
		it := ts.MakeFixed()
		for _, x := range strings {
			it.AddValue(ts.GetIdFor(x))
		}
		return it
	case "Number":
		fallthrough
	case "Boolean":
		fallthrough
	case "Date":
		fallthrough
	case "String":
		it := ts.MakeFixed()
		str, _ := val.ToString()
		it.AddValue(ts.GetIdFor(str))
		return it
	default:
		glog.Errorln("Trying to handle unsupported Javascript value.")
		return graph.NewNullIterator()
	}
}

func buildIteratorFromValue(val otto.Value, qs graph.QuadStore) graph.Iterator {
	if val.IsNull() || val.IsUndefined() {
		return qs.NodesAllIterator()
	}
	if val.IsPrimitive() {
		thing, _ := val.Export()
		switch v := thing.(type) {
		case string:
			it := qs.FixedIterator()
			it.Add(qs.ValueOf(v))
			return it
		default:
			glog.Errorln("Trying to build unknown primitive value.")
		}
	}
	switch val.Class() {
	case "Object":
		return buildIteratorTree(val.Object(), qs)
	case "Array":
		// Had better be an array of strings
		strings := stringsFrom(val.Object())
		it := qs.FixedIterator()
		for _, x := range strings {
			it.Add(qs.ValueOf(x))
		}
		return it
	case "Number":
		fallthrough
	case "Boolean":
		fallthrough
	case "Date":
		fallthrough
	case "String":
		it := qs.FixedIterator()
		it.Add(qs.ValueOf(val.String()))
		return it
	default:
		glog.Errorln("Trying to handle unsupported Javascript value.")
		return iterator.NewNull()
	}
}

func buildPathFromValue(val otto.Value) (out []interface{}) {
	if val.IsNull() || val.IsUndefined() {
		return nil
	}
	if val.IsPrimitive() {
		thing, _ := val.Export()
		switch v := thing.(type) {
		case string:
			out = append(out, v)
			return
		default:
			clog.Errorf("Trying to build unknown primitive value.")
		}
	}
	switch val.Class() {
	case "Object":
		out = append(out, buildPathFromObject(val.Object()))
		return
	case "Array":
		// Had better be an array of strings
		for _, x := range stringsFrom(val.Object()) {
			out = append(out, x)
		}
		return
	case "Number":
		fallthrough
	case "Boolean":
		fallthrough
	case "Date":
		fallthrough
	case "String":
		out = append(out, val.String())
		return
	default:
		clog.Errorf("Trying to handle unsupported Javascript value.")
		return nil
	}
}

func formatIndent(v otto.Value, width, indent, limit, level, additional int, seen map[otto.Value]bool) (string, error) {
	if limit == 0 {
		return "...", nil
	}

	switch {
	case v.IsBoolean(), v.IsNull(), v.IsNumber(), v.IsUndefined():
		return v.String(), nil
	case v.IsString():
		return fmt.Sprintf("%q", v.String()), nil
	case v.IsFunction():
		n, err := v.Object().Get("name")
		if err != nil {
			return "", err
		}
		if n.IsUndefined() {
			return "function", nil
		}
		return fmt.Sprintf("function %s", n.String()), nil
	case v.IsObject():
		if d, err := formatOneLine(v, limit, seen); err != nil {
			return "", err
		} else if level*indent+additional+len(d) <= width {
			return d, nil
		}

		switch v.Class() {
		case "Array":
			return formatArray(v, width, indent, limit, level, seen)
		default:
			return formatObject(v, width, indent, limit, level, seen)
		}
	default:
		return "", fmt.Errorf("couldn't format type %s", v.Class())
	}
}

func isOttoArray(value otto.Value) bool {
	return value.Class() == "Array" || value.Class() == "GoArray"
}