is_number.cpp

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// Copyright (c) 2024 anabrid GmbH
// Contact: https://www.anabrid.com/licensing/
//
// SPDX-License-Identifier: MIT OR GPL-2.0-or-later
 
#include "utils/is_number.h"
#include <charconv>
 
bool utils::is_number(const std::string::const_iterator &start, const std::string::const_iterator &end) {
  std::string::const_iterator it = start;
  while (it != end && std::isdigit(*it))
    ++it;
  return it == end;
}
 
bool utils::is_number(const std::string_view::const_iterator &start, const std::string_view::const_iterator &end) {
  std::string_view::const_iterator it = start;
  while (it != end && std::isdigit(*it))
    ++it;
  return it == end;
}
 
std::optional<int> utils::view_to_number(std::string_view view) {
  int result;
  auto [ptr, ec] = std::from_chars(view.data(), view.data() + view.size(), result);
 
  if (ec == std::errc{} && ptr == view.data() + view.size()) {
    return result;
  }
  return std::nullopt; // Conversion failed
}