package main

import (
	"fmt"
	"regexp"
	"strconv"
)

func isName(s string) bool {
	reg := regexp.MustCompile(`^"[A-Za-z]\w*$`)
	return reg.MatchString(s)
}

func toName(s string) string {
	if !isName(s) {
		panic(fmt.Errorf("name: %s (%s)", errInvalidName, s))
	}
	return s[1:]
}

func isNumber(s string) bool {
	if s != "" && s[0] == '"' {
		s = s[1:]
	}
	_, err := strconv.ParseFloat(s, 64)
	return err == nil
}

func toNumber(s string) float64 {
	if s != "" && s[0] == '"' {
		s = s[1:]
	}
	val, err := strconv.ParseFloat(s, 64)
	if err != nil {
		panic(fmt.Errorf("number: %s (%s)", errInvalidNumber, s))
	}
	return val
}

func isWord(s string) bool {
	return s != "" && s[0] == '"'
}

func isList(s string) bool {
	return s != "" && s[0] == '['
}

func isBool(s string) bool {
	if s != "" && s[0] == '"' {
		s = s[1:]
	}
	_, err := strconv.ParseBool(s)
	return err == nil
}

func toBool(s string) bool {
	if s != "" && s[0] == '"' {
		s = s[1:]
	}
	val, err := strconv.ParseBool(s)
	if err != nil {
		panic(fmt.Errorf("bool: %s (%s)", errInvalidBool, s))
	}
	return val
}

func isEmpty(s string) bool {
	return s == `"` || s == "[ ]"
}

func isValue(s string) bool {
	return isNumber(s) || isWord(s) || isList(s) || isBool(s)
}

func opIsName(val1 value) value {
	return value{val: strconv.FormatBool(isName(val1.val))}
}

func opIsNumber(val1 value) value {
	return value{val: strconv.FormatBool(isNumber(val1.val))}
}

func opIsWord(val1 value) value {
	return value{val: strconv.FormatBool(isWord(val1.val))}
}

func opIsList(val1 value) value {
	return value{val: strconv.FormatBool(isList(val1.val))}
}

func opIsBool(val1 value) value {
	return value{val: strconv.FormatBool(isBool(val1.val))}
}

func opIsEmpty(val1 value) value {
	return value{val: strconv.FormatBool(isEmpty(val1.val))}
}