#include "ml_string.h"


// Replace a substring with a replacement string in a source string
void replace_substring(std::string &src, const std::string &substr, const std::string &replacement) {
	size_t i = 0;
	for (i = src.find(substr, i); i != std::string::npos; i = src.find(substr, i)) {
		src.replace(i, substr.size(), replacement);
		i += replacement.size();
	}
}


// Returns true if where contains regex
bool regexp_search(const std::string &where, const std::string &regex_str) {
	// online tester https://www.regextester.com/97722
	std::regex regex(regex_str);
	std::smatch match;

	if (std::regex_search(where, match, regex)) {
		// std::cout << "matches for '" << where << "'\n";
		// std::cout << "Prefix: '" << match.prefix() << "'\n";
		// for (size_t i = 0; i < match.size(); ++i)
		// 	std::cout << i << ": " << match[i] << '\n';
		// std::cout << "Suffix: '" << match.suffix() << "\'\n\n";

		return true;
	}
	return false;
}

std::string string_padd(const std::string &str, int pad_len, char fill_char, bool from_right) {
	int str_len = str.length();

	if (str_len == pad_len)
		return str;
	else if (str_len > pad_len) {
		return (from_right ? str.substr(0, pad_len) : str.substr(str_len - pad_len, std::string::npos));
	}

	if (from_right)
		return str + std::string(pad_len - str.size(), fill_char);
	else
		return std::string(pad_len - str.size(), fill_char) + str;
}