ah-string-utils.cc

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/*
                          Aleph_w
 
  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2026 Leandro Rabindranath Leon
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
 
//
// Created by lrleon on 23/04/24.
//
# include <gtest/gtest.h>
 
# include <cmath>
# include <cstdlib>
# include <limits>
# include <random>
# include <sstream>
# include <stdexcept>
# include <vector>
 
# include <ah-string-utils.H>
 
using namespace std;
using namespace testing;
using namespace Aleph;
 
static DynList<string> reference_split_string(const string & s, const string & delim)
{
  DynList<string> ret;
  if (s.empty())
    return ret;
 
  if (delim.empty())
    {
      ret.append(s);
      return ret;
    }
 
  string token;
  for (char c : s)
    if (delim.find(c) == string::npos)
      token.push_back(c);
    else if (not token.empty())
      {
        ret.append(token);
        token.clear();
      }
 
  if (not token.empty())
    ret.append(token);
 
  return ret;
}
 
static void expect_tokens_eq(const DynList<string> & expected,
                             const DynList<string> & got)
{
  ASSERT_EQ(got.size(), expected.size());
  for (size_t i = 0; i < expected.size(); ++i)
    EXPECT_EQ(got.nth(i), expected.nth(i));
}
 
static void expect_tokens_eq(const DynList<string> & expected,
                             const Array<string> & got)
{
  ASSERT_EQ(got.size(), expected.size());
  for (size_t i = 0; i < expected.size(); ++i)
    EXPECT_EQ(got[i], expected.nth(i));
}
 
TEST(util, concat)
{
  string s1 = "hello";
  string s2 = "world";
  string blank = " ";
  string s3 = "!";
  string s = concat(s1, blank, s2, s3);
  ASSERT_EQ(s, "hello world!");
}
 
TEST(StringUtils, vector_to_string)
{
  vector<int> v = {1, 2, 3};
  EXPECT_EQ(Aleph::to_string(v), "1, 2, 3");
  vector<int> e;
  EXPECT_EQ(Aleph::to_string(e), "");
}
 
TEST(StringUtils, array_to_string)
{
  Array<int> a;
  EXPECT_EQ(Aleph::to_string(a), "");
  a.append(1);
  EXPECT_EQ(Aleph::to_string(a), "1");
  a.append(2);
  a.append(3);
  EXPECT_EQ(Aleph::to_string(a), "1, 2, 3");
}
 
TEST(StringUtils, trim_variants)
{
  {
    string s = "\t  abc  \n";
    EXPECT_EQ(trim(s), "abc");
    EXPECT_EQ(s, "\t  abc  \n");
  }
 
  {
    string s = "\t  abc  \n";
    EXPECT_EQ(trim_in_place(s), "abc");
    EXPECT_EQ(s, "abc");
  }
 
  {
    string s = "";
    EXPECT_EQ(trim(s), "");
    EXPECT_EQ(trim_in_place(s), "");
  }
}
 
TEST(StringUtils, contains_string_view)
{
  EXPECT_TRUE(contains("hello world", "world"));
  EXPECT_FALSE(contains("hello", "xyz"));
  EXPECT_TRUE(contains("", ""));
}
 
TEST(StringUtils, double_formatting)
{
  EXPECT_EQ(Aleph::to_string(1.5, 2), "1.50");
  EXPECT_EQ(Aleph::to_string(1.0, 0), "1");
  auto s = to_str(1.0 / 3.0);
  EXPECT_FALSE(s.empty());
}
 
TEST(StringUtils, case_conversion_ascii)
{
  EXPECT_EQ(Aleph::tolower("HeLLo"), "hello");
  EXPECT_EQ(Aleph::toupper("HeLLo"), "HELLO");
 
  string s = "HeLLo";
  EXPECT_EQ(mutable_tolower(s), "hello");
  EXPECT_EQ(s, "hello");
  EXPECT_EQ(mutable_toupper(s), "HELLO");
  EXPECT_EQ(s, "HELLO");
}
 
TEST(StringUtils, case_conversion_non_ascii_does_not_crash)
{
  string s;
  s.push_back(static_cast<char>(0xFF));
  s.push_back('A');
  auto lower = Aleph::to_lower(s);
  ASSERT_EQ(lower.size(), 2u);
  EXPECT_EQ(lower[1], 'a');
}
 
TEST(StringUtils, only_alpha_and_removals)
{
  EXPECT_EQ(only_alpha("A-bC_9"), "abc9");
  // Exercise each preserved range and its boundary characters: digits 0-9 and
  // lowercase a-z are kept verbatim, uppercase A-Z is lowercased, everything
  // else is dropped.
  EXPECT_EQ(only_alpha("Hello, World! 123"), "helloworld123");
  EXPECT_EQ(only_alpha("0123456789"), "0123456789");
  EXPECT_EQ(only_alpha("AZaz"), "azaz");
  EXPECT_EQ(only_alpha("@#$%^&*()"), "");
  EXPECT_EQ(only_alpha(""), "");
  EXPECT_EQ(remove_spaces(" a\tb\nc "), "abc");
  EXPECT_EQ(remove_symbols("a-b_c", "-_"), "abc");
  EXPECT_EQ(remove_symbols("", "-_"), "");
}
 
TEST(StringUtils, join_dynlist)
{
  DynList<int> l;
  EXPECT_EQ(join(l, ","), "");
  l.append(1);
  l.append(2);
  l.append(3);
  EXPECT_EQ(join(l, ","), "1,2,3");
  EXPECT_EQ(join(l, " - "), "1 - 2 - 3");
}
 
TEST(StringUtils, numeric_parsers)
{
  EXPECT_TRUE(is_long("0"));
  EXPECT_TRUE(is_long("-10"));
  EXPECT_FALSE(is_long(""));
  EXPECT_FALSE(is_long("10x"));
 
  EXPECT_TRUE(is_size_t("0"));
  EXPECT_TRUE(is_size_t("10"));
  EXPECT_FALSE(is_size_t("-1"));
  EXPECT_FALSE(is_size_t(""));
  EXPECT_FALSE(is_size_t("10x"));
 
  EXPECT_TRUE(is_double("0"));
  EXPECT_TRUE(is_double("-1.25"));
  EXPECT_TRUE(is_double("1e3"));
  EXPECT_FALSE(is_double(""));
  EXPECT_FALSE(is_double("1.2x"));
  EXPECT_FALSE(is_double("1e309"));
 
  EXPECT_TRUE(is_float("0"));
  EXPECT_TRUE(is_float("-1.25"));
  EXPECT_FALSE(is_float(""));
  EXPECT_FALSE(is_float("1.2x"));
}
 
TEST(StringUtils, prefix_and_remove_prefix)
{
  EXPECT_TRUE(is_prefix("foobar", "foo"));
  EXPECT_FALSE(is_prefix("foo", "foobar"));
 
  string s = "prefix_value";
  EXPECT_EQ(remove_prefix(s, "prefix_"), "value");
  EXPECT_EQ(s, "value");
}
 
TEST(StringUtils, to_name)
{
  EXPECT_EQ(to_name(""), "");
  EXPECT_EQ(to_name("hello"), "Hello");
  EXPECT_EQ(to_name("Hello"), "Hello");
}
 
TEST(StringUtils, split_camel_case)
{
  {
    auto parts = split_camel_case("");
    EXPECT_TRUE(parts.is_empty());
  }
 
  {
    auto parts = split_camel_case("camelCaseString");
    ASSERT_EQ(parts.size(), 3u);
    EXPECT_EQ(parts.nth(0), "camel");
    EXPECT_EQ(parts.nth(1), "Case");
    EXPECT_EQ(parts.nth(2), "String");
  }
}
 
TEST(StringUtils, split_and_split_string)
{
  {
    auto v = split("a,b,,c", ',');
    ASSERT_EQ(v.size(), 4u);
    EXPECT_EQ(v[0], "a");
    EXPECT_EQ(v[1], "b");
    EXPECT_EQ(v[2], "");
    EXPECT_EQ(v[3], "c");
  }
 
  {
    auto l = split_to_list("a--b---c", "-");
    ASSERT_EQ(l.size(), 3u);
    EXPECT_EQ(l.nth(0), "a");
    EXPECT_EQ(l.nth(1), "b");
    EXPECT_EQ(l.nth(2), "c");
  }
 
  {
    auto l = split_to_list("a b-c__d", " _-");
    ASSERT_EQ(l.size(), 4u);
    EXPECT_EQ(l.nth(0), "a");
    EXPECT_EQ(l.nth(1), "b");
    EXPECT_EQ(l.nth(2), "c");
    EXPECT_EQ(l.nth(3), "d");
  }
 
  {
    auto l = split_to_list("abc", "");
    ASSERT_EQ(l.size(), 1u);
    EXPECT_EQ(l.nth(0), "abc");
  }
}
 
TEST(StringUtilsCritical, split_string_edge_cases)
{
  {
    auto out = split_to_list("", ",");
    EXPECT_TRUE(out.is_empty());
  }
 
  {
    auto out = split_to_list(",,,,", ",");
    EXPECT_TRUE(out.is_empty());
  }
 
  {
    auto expected = reference_split_string(",a,,b,,,c,", ",");
    auto list_out = split_to_list(",a,,b,,,c,", ",");
    auto array_out = split_to_array(",a,,b,,,c,", ",");
    expect_tokens_eq(expected, list_out);
    expect_tokens_eq(expected, array_out);
  }
 
  {
    auto expected = reference_split_string("alpha||beta,gamma;;;delta", "|,;");
    auto list_out = split_to_list("alpha||beta,gamma;;;delta", "|,;");
    auto array_out = split_to_array("alpha||beta,gamma;;;delta", "|,;");
    expect_tokens_eq(expected, list_out);
    expect_tokens_eq(expected, array_out);
  }
 
  {
    auto expected = reference_split_string("  keep   everything  ", "");
    auto list_out = split_to_list("  keep   everything  ", "");
    auto array_out = split_to_array("  keep   everything  ", "");
    expect_tokens_eq(expected, list_out);
    expect_tokens_eq(expected, array_out);
  }
}
 
TEST(StringUtils, pascal_case)
{
  EXPECT_EQ(to_Pascalcase("hello_world"), "HelloWorld");
  EXPECT_EQ(to_Pascalcase("alreadyPascal"), "AlreadyPascal");
}
 
TEST(StringUtils, split_pos)
{
  string s = "abcd";
  EXPECT_EQ(split_pos(s, 0), (pair<string, string>("", "abcd")));
  EXPECT_EQ(split_pos(s, 2), (pair<string, string>("ab", "cd")));
  EXPECT_EQ(split_pos(s, 4), (pair<string, string>("abcd", "")));
  EXPECT_THROW(split_pos(s, 5), range_error);
}
 
TEST(StringUtils, split_n)
{
  EXPECT_THROW(split_n("abc", 0), range_error);
  EXPECT_THROW(split_n("abc", 4), range_error);
 
  auto l = split_n("abcdef", 4);
  ASSERT_EQ(l.size(), 4u);
  EXPECT_EQ(l.nth(0), "a");
  EXPECT_EQ(l.nth(1), "b");
  EXPECT_EQ(l.nth(2), "c");
  EXPECT_EQ(l.nth(3), "def");
}
 
TEST(StringUtils, complete_rows)
{
  DynList<DynList<int>> m;
  DynList<int> r1; r1.append(1); r1.append(2);
  DynList<int> r2; r2.append(3);
  m.append(r1);
  m.append(r2);
 
  auto out = complete_rows(m);
  ASSERT_EQ(out.size(), 2u);
  ASSERT_EQ(out.nth(0).size(), 2u);
  ASSERT_EQ(out.nth(1).size(), 2u);
  EXPECT_EQ(out.nth(1).nth(0), 3);
  EXPECT_EQ(out.nth(1).nth(1), 0);
}
 
TEST(StringUtils, format_string_no_underflow)
{
  DynList<DynList<string>> mat;
  DynList<string> r1; r1.append("abcd"); r1.append("x");
  DynList<string> r2; r2.append("ab"); r2.append("xyz");
  mat.append(r1);
  mat.append(r2);
 
  DynList<size_t> lens; lens.append(2); lens.append(1);
  auto formatted = Aleph::format_string(lens, mat);
  ASSERT_EQ(formatted.size(), 2u);
  ASSERT_EQ(formatted.nth(0).size(), 2u);
}
 
TEST(StringUtils, format_string_csv)
{
  DynList<DynList<string>> mat;
  DynList<string> r1; r1.append("a"); r1.append("b"); r1.append("c");
  mat.append(r1);
  auto csv = format_string_csv(mat);
  ASSERT_EQ(csv.size(), 1u);
  EXPECT_EQ(csv.nth(0).nth(0), "a,");
  EXPECT_EQ(csv.nth(0).nth(1), "b,");
  EXPECT_EQ(csv.nth(0).nth(2), "c");
}
 
TEST(StringUtils, text_wrapping_and_shift)
{
  const string text = "one two three four five";
  auto j = justify_text(text, 10, 2);
  EXPECT_TRUE(contains(j, "  "));
 
  auto a = align_text_to_left(text, 10, 1);
  EXPECT_TRUE(contains(a, " one"));
 
  auto shifted = shift_lines_to_left("a\nb", 3);
  EXPECT_EQ(shifted, "   a\n   b");
}
 
TEST(StringUtils, build_pars_list_variadic)
{
  EXPECT_EQ(::Aleph::build_pars_list(1), "1");
  EXPECT_EQ(::Aleph::build_pars_list(1, 2, 3), "1, 2, 3");
}
 
TEST(StringUtils, build_pars_list_container)
{
  DynList<int> l;
  EXPECT_EQ(::Aleph::build_pars_list(l), "");
  l.append(1);
  l.append(2);
  l.append(3);
  EXPECT_EQ(::Aleph::build_pars_list(l), "1,2,3");
  EXPECT_EQ(::Aleph::build_pars_list(l, " | "), "1 | 2 | 3");
}
 
TEST(StringUtils, fill_string)
{
  string s = "secret";
  fill_string(s, 'x');
  EXPECT_EQ(s, "xxxxxx");
 
  string e;
  fill_string(e, 'x');
  EXPECT_TRUE(e.empty());
}
 
TEST(StringUtils, split_to_array)
{
  auto a = split_to_array("a b-c__d", " _-");
  ASSERT_EQ(a.size(), 4u);
  EXPECT_EQ(a[0], "a");
  EXPECT_EQ(a[1], "b");
  EXPECT_EQ(a[2], "c");
  EXPECT_EQ(a[3], "d");
}
 
TEST(StringUtils, format_string_computed_lens)
{
  DynList<DynList<string>> mat;
  DynList<string> r1; r1.append("abcd"); r1.append("x");
  DynList<string> r2; r2.append("ab"); r2.append("xyz");
  mat.append(r1);
  mat.append(r2);
 
  auto formatted = Aleph::format_string(mat);
  ASSERT_EQ(formatted.size(), 2u);
  ASSERT_EQ(formatted.nth(0).size(), 2u);
  ASSERT_EQ(formatted.nth(1).size(), 2u);
}
 
TEST(StringUtilsCritical, format_string_exact_alignment_and_stream_output)
{
  DynList<DynList<string>> mat;
  DynList<string> r1; r1.append("id"); r1.append("value");
  DynList<string> r2; r2.append("7"); r2.append("abc");
  DynList<string> r3; r3.append("42"); r3.append("x");
  mat.append(r1);
  mat.append(r2);
  mat.append(r3);
 
  auto by_max = Aleph::format_string(mat);
  ASSERT_EQ(by_max.size(), 3u);
  EXPECT_EQ(by_max.nth(0).nth(0), "id ");
  EXPECT_EQ(by_max.nth(0).nth(1), "value ");
  EXPECT_EQ(by_max.nth(1).nth(0), " 7 ");
  EXPECT_EQ(by_max.nth(1).nth(1), "  abc ");
  EXPECT_EQ(by_max.nth(2).nth(0), "42 ");
  EXPECT_EQ(by_max.nth(2).nth(1), "    x ");
 
  DynList<size_t> lens;
  lens.append(3);
  lens.append(6);
  auto by_lens = Aleph::format_string(lens, mat);
  ASSERT_EQ(by_lens.size(), 3u);
  EXPECT_EQ(by_lens.nth(0).nth(0), " id ");
  EXPECT_EQ(by_lens.nth(0).nth(1), " value ");
  EXPECT_EQ(by_lens.nth(1).nth(0), "  7 ");
  EXPECT_EQ(by_lens.nth(1).nth(1), "   abc ");
  EXPECT_EQ(by_lens.nth(2).nth(0), " 42 ");
  EXPECT_EQ(by_lens.nth(2).nth(1), "     x ");
 
  std::ostringstream out;
  Aleph::format_string(out, lens, mat);
  EXPECT_EQ(out.str(), " id  value \n  7    abc \n 42      x \n");
}
 
TEST(StringUtils, to_string_matrix_and_lines)
{
  DynList<DynList<string>> mat;
  DynList<string> r1; r1.append("a"); r1.append("b");
  DynList<string> r2; r2.append("c"); r2.append("d");
  mat.append(r1);
  mat.append(r2);
  auto s = Aleph::to_string(mat);
  EXPECT_TRUE(contains(s, "a"));
  EXPECT_TRUE(contains(s, "d"));
 
  DynList<string> lines;
  lines.append("x");
  lines.append("y");
  EXPECT_EQ(Aleph::to_string(lines), "x\ny");
}
 
TEST(StringUtilsCritical, justify_text_exact_wrapping_and_margins)
{
  const auto justified = justify_text("a bb c ddd e", 7, 2);
  EXPECT_EQ(justified, "  a  bb c\n  ddd e");
 
  auto lines = split_text_into_lines(justified);
  ASSERT_EQ(lines.size(), 2u);
  EXPECT_EQ(lines.nth(0).size(), 9u); // width + margin
  EXPECT_EQ(lines.nth(1), "  ddd e");
 
  EXPECT_EQ(justify_text("encyclopedia x", 5), "encyclopedia\nx");
  EXPECT_EQ(justify_text("  one\t two\nthree  ", 6), "one\ntwo\nthree");
}
 
TEST(StringUtilsCritical, numeric_parsing_strictness)
{
  EXPECT_TRUE(is_double("0"));
  EXPECT_TRUE(is_double("-1.25"));
  EXPECT_TRUE(is_double("6.022e23"));
  EXPECT_TRUE(is_double("  +3.5"));
 
  EXPECT_FALSE(is_double(""));
  EXPECT_FALSE(is_double("1.2x"));
  EXPECT_FALSE(is_double("3.14 "));
  EXPECT_FALSE(is_double("1e309"));
  EXPECT_FALSE(is_double("1e-5000"));
  EXPECT_FALSE(is_double("nan"));
  EXPECT_FALSE(is_double("inf"));
 
  EXPECT_DOUBLE_EQ(safe_atof("0"), 0.0);
  EXPECT_NEAR(safe_atof("-1.25e2"), -125.0, 1e-12);
  EXPECT_NEAR(safe_atof("  +3.5"), 3.5, 1e-12);
 
  EXPECT_THROW(safe_atof(""), runtime_error);
  EXPECT_THROW(safe_atof("abc"), runtime_error);
  EXPECT_THROW(safe_atof("1.2x"), runtime_error);
  EXPECT_THROW(safe_atof("3.5 "), runtime_error);
  EXPECT_THROW(safe_atof("1e309"), runtime_error);
  EXPECT_THROW(safe_atof("1e-5000"), runtime_error);
  EXPECT_THROW(safe_atof("nan"), runtime_error);
  EXPECT_THROW(safe_atof("inf"), runtime_error);
}
 
TEST(StringUtils, split_text_into_words_and_lines)
{
  auto w = split_text_into_words("  a\t b\n c  ");
  ASSERT_EQ(w.size(), 3u);
  EXPECT_EQ(w.nth(0), "a");
  EXPECT_EQ(w.nth(1), "b");
  EXPECT_EQ(w.nth(2), "c");
 
  auto l = split_text_into_lines("a\nb\n");
  ASSERT_EQ(l.size(), 2u);
  EXPECT_EQ(l.nth(0), "a");
  EXPECT_EQ(l.nth(1), "b");
}
 
TEST(StringUtils, justify_and_align_except_first)
{
  const string text = "one two three four five";
  auto j = justify_line_except_first(text, 10, 4);
  EXPECT_TRUE(contains(j, "one"));
  EXPECT_TRUE(contains(j, "\n"));
 
  auto a = align_text_to_left_except_first(text, 10, 3);
  EXPECT_TRUE(contains(a, "one"));
  EXPECT_TRUE(contains(a, "\n"));
}
 
TEST(StringUtils, numeric_boundaries)
{
  const auto max_st = std::numeric_limits<size_t>::max();
  EXPECT_TRUE(is_size_t(::std::to_string(max_st)));
  EXPECT_FALSE(is_size_t(::std::to_string(max_st) + "0"));
 
  const auto max_l = std::numeric_limits<long>::max();
  const auto min_l = std::numeric_limits<long>::min();
  EXPECT_TRUE(is_long(::std::to_string(max_l)));
  EXPECT_TRUE(is_long(::std::to_string(min_l)));
  EXPECT_FALSE(is_long(::std::to_string(max_l) + "0"));
}
 
static int stress_multiplier()
{
  const char *v = std::getenv("ALEPH_STRESS");
  if (v == nullptr or *v == '\0')
    return 1;
 
  char *end = nullptr;
  const long m = std::strtol(v, &end, 10);
  if (end == v or *end != '\0')
    return 1;
 
  if (m < 1)
    return 1;
 
  if (m > 50)
    return 50;
 
  return int(m);
}
 
static string random_string(std::mt19937 & rng, size_t len)
{
  std::uniform_int_distribution<int> byte_dist(0, 255);
  string s;
  s.reserve(len);
  for (size_t i = 0; i < len; ++i)
    s.push_back(static_cast<char>(byte_dist(rng)));
  return s;
}
 
static string random_ascii_token(std::mt19937 & rng, size_t len)
{
  static constexpr char alphabet[] =
    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  std::uniform_int_distribution<int> pick(0, int(sizeof(alphabet) - 2));
  string s;
  s.reserve(len);
  for (size_t i = 0; i < len; ++i)
    s.push_back(alphabet[pick(rng)]);
  return s;
}
 
TEST(StringUtilsStress, split_pos_recomposes)
{
  std::mt19937 rng(12345);
  for (int iter = 0; iter < 2000*stress_multiplier(); ++iter)
    {
      const auto s = random_ascii_token(rng, size_t(iter % 64));
      for (size_t pos = 0; pos <= s.size(); ++pos)
        {
          auto p = split_pos(s, pos);
          EXPECT_EQ(p.first + p.second, s);
          EXPECT_EQ(p.first.size(), pos);
        }
    }
}
 
TEST(StringUtilsStress, split_n_recomposes)
{
  std::mt19937 rng(54321);
  for (int iter = 0; iter < 1500*stress_multiplier(); ++iter)
    {
      const auto s = random_ascii_token(rng, 1 + size_t(iter % 128));
      const size_t n = 1 + (size_t(iter) % std::min<size_t>(16, s.size()));
      auto parts = split_n(s, n);
      ASSERT_EQ(parts.size(), n);
      string recomposed;
      parts.for_each([&](const string &x) { recomposed += x; });
      EXPECT_EQ(recomposed, s);
 
      const size_t base = s.size() / n;
      for (size_t i = 0; i + 1 < n; ++i)
        EXPECT_EQ(parts.nth(i).size(), base);
    }
}
 
TEST(StringUtilsStress, split_string_tokens_have_no_delims)
{
  std::mt19937 rng(999);
  static const string delims = " _-";
  for (int iter = 0; iter < 2000*stress_multiplier(); ++iter)
    {
      string s;
      const size_t tokens = 1 + (size_t(iter) % 12);
      for (size_t i = 0; i < tokens; ++i)
        {
          if (i)
            s.push_back(delims[size_t(iter + int(i)) % delims.size()]);
          s += random_ascii_token(rng, 1 + (size_t(iter + int(i)) % 10));
        }
 
      auto out = split_to_list(s, delims);
      ASSERT_FALSE(out.is_empty());
      out.for_each([&](const string &t)
      {
        EXPECT_FALSE(t.empty());
        for (char c : delims)
          EXPECT_EQ(t.find(c), string::npos);
      });
    }
}
 
TEST(StringUtilsStress, split_string_matches_reference_parser)
{
  std::mt19937 rng(1337);
  static const string delim_pool = " ,;|/_-\t\n";
  static const string token_pool =
      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 
  std::uniform_int_distribution<int> delim_size_dist(0, 4);
  std::uniform_int_distribution<int> delim_pick(0, int(delim_pool.size() - 1));
  std::uniform_int_distribution<int> token_pick(0, int(token_pool.size() - 1));
  std::uniform_int_distribution<int> text_len_dist(0, 128);
  std::bernoulli_distribution use_delim(0.30);
 
  for (int iter = 0; iter < 2000*stress_multiplier(); ++iter)
    {
      string delims;
      const int dsz = delim_size_dist(rng);
      for (int i = 0; i < dsz; ++i)
        delims.push_back(delim_pool[size_t(delim_pick(rng))]);
 
      string text;
      const int len = text_len_dist(rng);
      text.reserve(size_t(len));
      for (int i = 0; i < len; ++i)
        if (not delims.empty() and use_delim(rng))
          text.push_back(delims[size_t(delim_pick(rng)) % delims.size()]);
        else
          text.push_back(token_pool[size_t(token_pick(rng))]);
 
      const auto expected = reference_split_string(text, delims);
      const auto list_out = split_to_list(text, delims);
      const auto array_out = split_to_array(text, delims);
 
      expect_tokens_eq(expected, list_out);
      expect_tokens_eq(expected, array_out);
    }
}
 
TEST(StringUtilsStress, case_conversion_no_crash_and_preserves_length)
{
  std::mt19937 rng(2024);
  for (int iter = 0; iter < 3000*stress_multiplier(); ++iter)
    {
      auto s = random_string(rng, size_t(iter % 128));
      auto lo = Aleph::to_lower(s);
      auto up = Aleph::to_upper(s);
      EXPECT_EQ(lo.size(), s.size());
      EXPECT_EQ(up.size(), s.size());
    }
}
 
TEST(StringUtilsStress, build_pars_list_round_trip_for_ints)
{
  std::mt19937 rng(77);
  std::uniform_int_distribution<int> dist(-100000, 100000);
 
  for (int iter = 0; iter < 2000*stress_multiplier(); ++iter)
    {
      const int a = dist(rng);
      const int b = dist(rng);
      const int c = dist(rng);
 
      const auto got = ::Aleph::build_pars_list(a, b, c);
      const auto expected = ::std::to_string(a) + ", " + ::std::to_string(b) + ", " + ::std::to_string(c);
      EXPECT_EQ(got, expected);
    }
}