strings.hpp

#pragma once
 
#include <algorithm>
#include <cctype>
#include <string_view>
 
namespace delpi {

inline bool ichar_equals(const char a, const char b) noexcept {
  return std::tolower(static_cast<unsigned char>(a)) == std::tolower(static_cast<unsigned char>(b));
}

inline bool ieq(std::string_view a, std::string_view b) { return std::ranges::equal(a, b, ichar_equals); }

inline std::string_view nextToken(std::string_view &line) noexcept {
  // Skip leading whitespace
  std::size_t i = 0;
  while (i < line.size() && std::isspace(line[i])) ++i;
  if (i == line.size()) {
    line = {};
    return {};
  }
  line.remove_prefix(i);
 
  // Find end of token
  std::size_t j = 0;
  while (j < line.size() && !std::isspace(line[j])) ++j;
 
  const std::string_view tok = line.substr(0, j);
  line.remove_prefix(j);
  return tok;
}

inline std::string_view peakNextToken(const std::string_view line) noexcept {
  // Skip leading whitespace
  std::size_t i = 0;
  while (i < line.size() && std::isspace(line[i])) ++i;
  if (i >= line.size()) return {};
 
  // Find end of token
  std::size_t j = i + 1;
  while (j < line.size() && !std::isspace(line[j])) ++j;
  return line.substr(i, j - i);
}

inline std::string_view trim(const std::string_view str) noexcept {
  std::size_t start = 0, end = str.size() - 1;
  while (start < str.size() && std::isspace(str[start])) ++start;
  while (end > start && std::isspace(str[end])) --end;
  return str.substr(start, end - start + 1);
}
 
}  // namespace delpi