commando/parse.go at master · wh64dev/commando · GitHub

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package commando

import (
	"fmt"
	"strconv"
	"strings"

	"github.com/wh64dev/commando/option"
)

func convertFullOption(opt option.OptionData, args []string) {
	for i, arg := range args {
		if strings.HasPrefix(arg, "--") {
			continue
		}

		if !strings.HasPrefix(arg, "-") {
			continue
		}

		for _, alias := range opt.Alias {
			if !strings.Contains(arg, alias) {
				continue
			}

			args[i] = fmt.Sprintf("--%s", opt.Name)
			break
		}
	}
}

func untagPrefix(arg string) string {
	var value = arg
	value = strings.TrimPrefix(value, "--")
	value = strings.TrimPrefix(value, "-")

	return value
}

func extractIndex(name string, args []string) (int, error) {
	for i, arg := range args {
		var ret = arg
		if !strings.HasPrefix(ret, "-") && !strings.HasPrefix(ret, "--") {
			continue
		}

		ret = untagPrefix(arg)
		if ret != name {
			continue
		}

		return i, nil
	}

	return -1, fmt.Errorf("option --%s is not defined", name)
}

func ParseString(n *CommandoNode, opt option.OptionData) (string, error) {
	if opt.Type != option.STRING {
		return "", fmt.Errorf("option --%s is not a string", opt.Name)
	}

	var args = n.Commando.args
	if opt.Alias != nil {
		convertFullOption(opt, args)
	}

	var index, err = extractIndex(opt.Name, args)
	if err != nil {
		return "", err
	}

	if index == -1 {
		return "", nil
	}

	if index+1 >= len(args) {
		return "", fmt.Errorf("option --%s value is not defined", opt.Name)
	}

	return n.Commando.args[index+1], nil
}

func ParseInt(n *CommandoNode, opt option.OptionData) (int64, error) {
	if opt.Type != option.INTEGER {
		return 0, fmt.Errorf("option --%s is not a integer", opt.Name)
	}

	var args = n.Commando.args
	if opt.Alias != nil {
		convertFullOption(opt, args)
	}

	var index, err = extractIndex(opt.Name, args)
	if err != nil {
		return 0, err
	}

	if index == -1 {
		return 0, nil
	}

	if index+1 >= len(args) {
		return 0, fmt.Errorf("option --%s value is not defined", opt.Name)
	}

	var arg = n.Commando.args[index+1]
	if strings.HasPrefix(arg, "-") || strings.HasPrefix(arg, "--") {
		return 0, fmt.Errorf("option --%s value is not defined", opt.Name)
	}

	return strconv.ParseInt(arg, 0, 64)
}

func ParseFloat(n *CommandoNode, opt option.OptionData) (float64, error) {
	if opt.Type != option.FLOAT {
		return 0, fmt.Errorf("--%s is not a string", opt.Name)
	}

	var args = n.Commando.args
	if opt.Alias != nil {
		convertFullOption(opt, args)
	}

	index, err := extractIndex(opt.Name, n.Commando.args)
	if err != nil {
		return 0, err
	}

	if index == -1 {
		return 0, nil
	}

	if index+1 >= len(n.Commando.args) {
		return 0, fmt.Errorf("option --%s value is not defined", opt.Name)
	}

	arg := n.Commando.args[index+1]
	if strings.HasPrefix(arg, "-") || strings.HasPrefix(arg, "--") {
		return 0, fmt.Errorf("option --%s value is not defined", opt.Name)
	}

	return strconv.ParseFloat(arg, 64)
}

func ParseBool(n *CommandoNode, opt option.OptionData) (bool, error) {
	if opt.Type != option.BOOLEAN {
		return false, fmt.Errorf("option --%s is not a bool", opt.Name)
	}

	var args = n.Commando.args
	if opt.Alias != nil {
		convertFullOption(opt, args)
	}

	index, err := extractIndex(opt.Name, n.Commando.args)
	if err != nil {
		return false, nil
	}

	if index+1 >= len(n.Commando.args) {
		return true, nil
	}

	var arg = n.Commando.args[index+1]
	if arg != "true" && arg != "false" && arg != "1" && arg != "0" {
		return true, nil
	}

	var parsed bool
	parsed, err = strconv.ParseBool(arg)
	if err != nil {
		return false, err
	}

	return parsed, nil
}