package parser

import (
	"fmt"
	"os"
	"strings"
)

var traceLevel = 0

const traceIndentPlaceholder = "\t"

func indentLevel() string {
	return strings.Repeat(traceIndentPlaceholder, traceLevel-1)
}

func tracePrint(fs string) {
	if os.Getenv("VERBOSE") != "" {
		fmt.Printf("%s%s\n", indentLevel(), fs)
	}
}

func indentInc() {
	traceLevel++
}

func indentDec() {
	traceLevel--
}

func trace(msg string) string {
	indentInc()
	tracePrint("BEGIN " + msg)
	return msg
}

func untrace(msg string) {
	tracePrint("END " + msg)
	indentDec()
}