flag_field.go

/*
 * Copyright (C) 2017-2018 Alibaba Group Holding Limited
 */
package cli

import (
	"github.com/aliyun/aliyun-cli/i18n"
	"fmt"
)

type Field struct {
	//
	// appear in `--flag key1=value1, key2=value2`
	// if Key assigned with "", it can used with `--flag value1 value2`
	Key string

	//
	// if Required is true, this field must be assigned
	Required bool

	//
	// if Repeatable is true, this field can appear multiply times, eg: "--flag key1=value1 key2=value2"
	Repeatable bool

	//
	// if field not appear, use this value, not used with Required
	DefaultValue string

	//
	// Message show
	Short *i18n.Text

	assigned bool
	value string
	values []string
}

func (f *Field) assign(v string) {
	f.assigned = true
	f.value = v
	f.values = append(f.values, v)
}

func (f *Field) getValue() (string, bool) {
	if f.assigned {
		return f.value, true
	} else if f.DefaultValue != "" {
		return f.DefaultValue, false
	} else {
		return "", false
	}
}

func (f *Field) check() error {
	if f.Required && !f.assigned {
		if f.Key != "" {
			return fmt.Errorf("%s= required", f.Key)
		} else {
			return fmt.Errorf("value required")
		}
	}
	if !f.Repeatable && len(f.values) > 1 {
		if f.Key != "" {
			return fmt.Errorf("%s= duplicated", f.Key)
		} else {
			return fmt.Errorf("value duplicated")
		}
	}
	return nil
}