String utils

string_u.gd

class_name StringU

static func invert_string(s:String)->String:
	var chars_pool = PoolStringArray()
	var length = s.length()
	chars_pool.resize(length)
	for i in length:
		chars_pool[i] = s[i]
	chars_pool.invert()
	return chars_pool.join("")

static func str_mult(s:String, times:int)->String:
	if not times: return ''
	var res = s
	for i in times-1:
		res+= s
	return res


static func snake2camel(string:String)->String:
	
	var result = PoolStringArray()
	var prev_is_underscore = false
	for ch in string:
		if ch=='_':
			prev_is_underscore = true
		else:
			if prev_is_underscore:
				result.append(ch.to_upper())
			else:
				result.append(ch)
			prev_is_underscore = false


	return result.join('')


static func snake2pascal(string:String)->String:
	var result = snake2camel(string)
	result[0] = result[0].to_upper()
	return result



static func camel2snake(string:String)->String:
	var result = PoolStringArray()
	for ch in string:
		if ch == ch.to_lower():
			result.append(ch)
		else:
			result.append('_'+ch.to_lower())

	return result.join('')


static func pascal2snake(string:String)->String:
	var result = PoolStringArray()
	for ch in string:
		if ch == ch.to_lower():
			result.append(ch)
		else:
			result.append('_'+ch.to_lower())
	result[0] = result[0][1]
	return result.join('')

# this one is better
static func pascal2snake(string:String)->String:
	var result = PoolStringArray()
	var recent_is_digit = true
	for ch in string:
		ch = ch as String

		if ch.is_valid_integer():
			recent_is_digit = true
			result.append(ch)
		else:
			if recent_is_digit:
				result.append(ch.to_lower())
			elif ch == ch.to_lower():
				result.append(ch)
			else:
				result.append('_'+ch.to_lower())
			
			recent_is_digit = false

	return result.join('')


#=============== not tested! =======================

static func split_strip(s:String, delim = " ")->PoolStringArray:
	var res: = PoolStringArray()
	res = s.split(delim, false)
	for i in range(res.size()):
		res[i] = res[i].strip_edges()
	return res

static func split_lstrip(s:String, delim = " ")->PoolStringArray:
	var res: = PoolStringArray()
	res = s.split(delim, false)
	for i in range(res.size()):
		res[i] = res[i].lstrip(" 	")
	return res


static func replace(s:String, start_idx:int, end_idx:int, with:String)->String:
	if end_idx<start_idx: return s
	
	var start = s.substr(0, start_idx)
	var end = s.substr(end_idx)
	var new:String = start+with+end
	return new