Export of internal Abseil changes.

--
70f43a482d7d4ae4a255f17ca02b0106653dd600 by Shaindel Schwartz <shaindel@google.com>:

Internal change

PiperOrigin-RevId: 201571193

--
93e6e9c2e683158be49d9dd1f5cb1a91d0c0f556 by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 201567108

--
fbd8ee94fbe9f2448e5adf5e88706f9c8216048f by Juemin Yang <jueminyang@google.com>:

str_format release

PiperOrigin-RevId: 201565129

--
387faa301555a8a888c4429df52734aa806dca46 by Abseil Team <absl-team@google.com>:

Adds a defaulted allocator parameter to the size_type constructor of InlinedVector

PiperOrigin-RevId: 201558711

--
39b15ea2c68d7129d70cbde7e71af900032595ec by Matt Calabrese <calabrese@google.com>:

Update the variant implementation to eliminate unnecessary checking on alternative access when the index is known or required to be correct.

PiperOrigin-RevId: 201529535

--
adab77f1f7bb363aa534297f22aae2b0f08889ea by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 201458388

--
a701dc0ba62e3cadf0de14203415b91df4ee8151 by Greg Falcon <gfalcon@google.com>:

Internal cleanup

PiperOrigin-RevId: 201394836

--
8a7191410b8f440fdfa27f722ff05e451502ab61 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 201369269
GitOrigin-RevId: 70f43a482d7d4ae4a255f17ca02b0106653dd600
Change-Id: I8ab073b30b4e27405a3b6da2c826bb4f3f0b9af6

1 files changed, 603 insertions, 0 deletions

diff --git a/absl/strings/str_format_test.cc b/absl/strings/str_format_test.cc
new file mode 100644
index 000000000000..fe742bf99533
--- /dev/null
+++ b/absl/strings/str_format_test.cc
@@ -0,0 +1,603 @@
+
+#include <cstdarg>
+#include <cstdint>
+#include <cstdio>
+#include <string>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace {
+using str_format_internal::FormatArgImpl;
+
+class FormatEntryPointTest : public ::testing::Test { };
+
+TEST_F(FormatEntryPointTest, Format) {
+  std::string sink;
+  EXPECT_TRUE(Format(&sink, "A format %d", 123));
+  EXPECT_EQ("A format 123", sink);
+  sink.clear();
+
+  ParsedFormat<'d'> pc("A format %d");
+  EXPECT_TRUE(Format(&sink, pc, 123));
+  EXPECT_EQ("A format 123", sink);
+}
+TEST_F(FormatEntryPointTest, UntypedFormat) {
+  constexpr const char* formats[] = {
+    "",
+    "a",
+    "%80d",
+#if !defined(_MSC_VER) && !defined(__ANDROID__)
+    // MSVC and Android don't support positional syntax.
+    "complicated multipart %% %1$d format %1$0999d",
+#endif  // _MSC_VER
+  };
+  for (const char* fmt : formats) {
+    std::string actual;
+    int i = 123;
+    FormatArgImpl arg_123(i);
+    absl::Span<const FormatArgImpl> args(&arg_123, 1);
+    UntypedFormatSpec format(fmt);
+
+    EXPECT_TRUE(FormatUntyped(&actual, format, args));
+    char buf[4096]{};
+    snprintf(buf, sizeof(buf), fmt, 123);
+    EXPECT_EQ(
+        str_format_internal::FormatPack(
+            str_format_internal::UntypedFormatSpecImpl::Extract(format), args),
+        buf);
+    EXPECT_EQ(actual, buf);
+  }
+  // The internal version works with a preparsed format.
+  ParsedFormat<'d'> pc("A format %d");
+  int i = 345;
+  FormatArg arg(i);
+  std::string out;
+  EXPECT_TRUE(str_format_internal::FormatUntyped(
+      &out, str_format_internal::UntypedFormatSpecImpl(&pc), {&arg, 1}));
+  EXPECT_EQ("A format 345", out);
+}
+
+TEST_F(FormatEntryPointTest, StringFormat) {
+  EXPECT_EQ("123", StrFormat("%d", 123));
+  constexpr absl::string_view view("=%d=", 4);
+  EXPECT_EQ("=123=", StrFormat(view, 123));
+}
+
+TEST_F(FormatEntryPointTest, AppendFormat) {
+  std::string s;
+  std::string& r = StrAppendFormat(&s, "%d", 123);
+  EXPECT_EQ(&s, &r);  // should be same object
+  EXPECT_EQ("123", r);
+}
+
+TEST_F(FormatEntryPointTest, AppendFormatFail) {
+  std::string s = "orig";
+
+  UntypedFormatSpec format(" more %d");
+  FormatArgImpl arg("not an int");
+
+  EXPECT_EQ("orig",
+            str_format_internal::AppendPack(
+                &s, str_format_internal::UntypedFormatSpecImpl::Extract(format),
+                {&arg, 1}));
+}
+
+
+TEST_F(FormatEntryPointTest, ManyArgs) {
+  EXPECT_EQ("24", StrFormat("%24$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+                            14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24));
+  EXPECT_EQ("60", StrFormat("%60$d", 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+                            14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
+                            27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
+                            40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
+                            53, 54, 55, 56, 57, 58, 59, 60));
+}
+
+TEST_F(FormatEntryPointTest, Preparsed) {
+  ParsedFormat<'d'> pc("%d");
+  EXPECT_EQ("123", StrFormat(pc, 123));
+  // rvalue ok?
+  EXPECT_EQ("123", StrFormat(ParsedFormat<'d'>("%d"), 123));
+  constexpr absl::string_view view("=%d=", 4);
+  EXPECT_EQ("=123=", StrFormat(ParsedFormat<'d'>(view), 123));
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCapture) {
+  int n = 0;
+  EXPECT_EQ("", StrFormat("%n", FormatCountCapture(&n)));
+  EXPECT_EQ(0, n);
+  EXPECT_EQ("123", StrFormat("%d%n", 123, FormatCountCapture(&n)));
+  EXPECT_EQ(3, n);
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureWrongType) {
+  // Should reject int*.
+  int n = 0;
+  UntypedFormatSpec format("%d%n");
+  int i = 123, *ip = &n;
+  FormatArgImpl args[2] = {FormatArgImpl(i), FormatArgImpl(ip)};
+
+  EXPECT_EQ("", str_format_internal::FormatPack(
+                    str_format_internal::UntypedFormatSpecImpl::Extract(format),
+                    absl::MakeSpan(args)));
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureMultiple) {
+  int n1 = 0;
+  int n2 = 0;
+  EXPECT_EQ("    1         2",
+            StrFormat("%5d%n%10d%n", 1, FormatCountCapture(&n1), 2,
+                      FormatCountCapture(&n2)));
+  EXPECT_EQ(5, n1);
+  EXPECT_EQ(15, n2);
+}
+
+TEST_F(FormatEntryPointTest, FormatCountCaptureExample) {
+  int n;
+  std::string s;
+  StrAppendFormat(&s, "%s: %n%s\n", "(1,1)", FormatCountCapture(&n), "(1,2)");
+  StrAppendFormat(&s, "%*s%s\n", n, "", "(2,2)");
+  EXPECT_EQ(7, n);
+  EXPECT_EQ(
+      "(1,1): (1,2)\n"
+      "       (2,2)\n",
+      s);
+}
+
+TEST_F(FormatEntryPointTest, Stream) {
+  const std::string formats[] = {
+    "",
+    "a",
+    "%80d",
+#if !defined(_MSC_VER) && !defined(__ANDROID__)
+    // MSVC doesn't support positional syntax.
+    "complicated multipart %% %1$d format %1$080d",
+#endif  // _MSC_VER
+  };
+  std::string buf(4096, '\0');
+  for (const auto& fmt : formats) {
+    const auto parsed = ParsedFormat<'d'>::NewAllowIgnored(fmt);
+    std::ostringstream oss;
+    oss << StreamFormat(*parsed, 123);
+    int fmt_result = snprintf(&*buf.begin(), buf.size(), fmt.c_str(), 123);
+    ASSERT_TRUE(oss) << fmt;
+    ASSERT_TRUE(fmt_result >= 0 && static_cast<size_t>(fmt_result) < buf.size())
+        << fmt_result;
+    EXPECT_EQ(buf.c_str(), oss.str());
+  }
+}
+
+TEST_F(FormatEntryPointTest, StreamOk) {
+  std::ostringstream oss;
+  oss << StreamFormat("hello %d", 123);
+  EXPECT_EQ("hello 123", oss.str());
+  EXPECT_TRUE(oss.good());
+}
+
+TEST_F(FormatEntryPointTest, StreamFail) {
+  std::ostringstream oss;
+  UntypedFormatSpec format("hello %d");
+  FormatArgImpl arg("non-numeric");
+  oss << str_format_internal::Streamable(
+      str_format_internal::UntypedFormatSpecImpl::Extract(format), {&arg, 1});
+  EXPECT_EQ("hello ", oss.str());  // partial write
+  EXPECT_TRUE(oss.fail());
+}
+
+std::string WithSnprintf(const char* fmt, ...) {
+  std::string buf;
+  buf.resize(128);
+  va_list va;
+  va_start(va, fmt);
+  int r = vsnprintf(&*buf.begin(), buf.size(), fmt, va);
+  va_end(va);
+  EXPECT_GE(r, 0);
+  EXPECT_LT(r, buf.size());
+  buf.resize(r);
+  return buf;
+}
+
+TEST_F(FormatEntryPointTest, FloatPrecisionArg) {
+  // Test that positional parameters for width and precision
+  // are indexed to precede the value.
+  // Also sanity check the same formats against snprintf.
+  EXPECT_EQ("0.1", StrFormat("%.1f", 0.1));
+  EXPECT_EQ("0.1", WithSnprintf("%.1f", 0.1));
+  EXPECT_EQ("  0.1", StrFormat("%*.1f", 5, 0.1));
+  EXPECT_EQ("  0.1", WithSnprintf("%*.1f", 5, 0.1));
+  EXPECT_EQ("0.1", StrFormat("%.*f", 1, 0.1));
+  EXPECT_EQ("0.1", WithSnprintf("%.*f", 1, 0.1));
+  EXPECT_EQ("  0.1", StrFormat("%*.*f", 5, 1, 0.1));
+  EXPECT_EQ("  0.1", WithSnprintf("%*.*f", 5, 1, 0.1));
+}
+namespace streamed_test {
+struct X {};
+std::ostream& operator<<(std::ostream& os, const X&) {
+  return os << "X";
+}
+}  // streamed_test
+
+TEST_F(FormatEntryPointTest, FormatStreamed) {
+  EXPECT_EQ("123", StrFormat("%s", FormatStreamed(123)));
+  EXPECT_EQ("  123", StrFormat("%5s", FormatStreamed(123)));
+  EXPECT_EQ("123  ", StrFormat("%-5s", FormatStreamed(123)));
+  EXPECT_EQ("X", StrFormat("%s", FormatStreamed(streamed_test::X())));
+  EXPECT_EQ("123", StrFormat("%s", FormatStreamed(StreamFormat("%d", 123))));
+}
+
+// Helper class that creates a temporary file and exposes a FILE* to it.
+// It will close the file on destruction.
+class TempFile {
+ public:
+  TempFile() : file_(std::tmpfile()) {}
+  ~TempFile() { std::fclose(file_); }
+
+  std::FILE* file() const { return file_; }
+
+  // Read the file into a std::string.
+  std::string ReadFile() {
+    std::fseek(file_, 0, SEEK_END);
+    int size = std::ftell(file_);
+    std::rewind(file_);
+    std::string str(2 * size, ' ');
+    int read_bytes = std::fread(&str[0], 1, str.size(), file_);
+    EXPECT_EQ(read_bytes, size);
+    str.resize(read_bytes);
+    EXPECT_TRUE(std::feof(file_));
+    return str;
+  }
+
+ private:
+  std::FILE* file_;
+};
+
+TEST_F(FormatEntryPointTest, FPrintF) {
+  TempFile tmp;
+  int result =
+      FPrintF(tmp.file(), "STRING: %s NUMBER: %010d", std::string("ABC"), -19);
+  EXPECT_EQ(result, 30);
+  EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
+}
+
+TEST_F(FormatEntryPointTest, FPrintFError) {
+  errno = 0;
+  int result = FPrintF(stdin, "ABC");
+  EXPECT_LT(result, 0);
+  EXPECT_EQ(errno, EBADF);
+}
+
+#if __GNUC__
+TEST_F(FormatEntryPointTest, FprintfTooLarge) {
+  std::FILE* f = std::fopen("/dev/null", "w");
+  int width = 2000000000;
+  errno = 0;
+  int result = FPrintF(f, "%*d %*d", width, 0, width, 0);
+  EXPECT_LT(result, 0);
+  EXPECT_EQ(errno, EFBIG);
+  std::fclose(f);
+}
+
+TEST_F(FormatEntryPointTest, PrintF) {
+  int stdout_tmp = dup(STDOUT_FILENO);
+
+  TempFile tmp;
+  std::fflush(stdout);
+  dup2(fileno(tmp.file()), STDOUT_FILENO);
+
+  int result = PrintF("STRING: %s NUMBER: %010d", std::string("ABC"), -19);
+
+  std::fflush(stdout);
+  dup2(stdout_tmp, STDOUT_FILENO);
+  close(stdout_tmp);
+
+  EXPECT_EQ(result, 30);
+  EXPECT_EQ(tmp.ReadFile(), "STRING: ABC NUMBER: -000000019");
+}
+#endif  // __GNUC__
+
+TEST_F(FormatEntryPointTest, SNPrintF) {
+  char buffer[16];
+  int result =
+      SNPrintF(buffer, sizeof(buffer), "STRING: %s", std::string("ABC"));
+  EXPECT_EQ(result, 11);
+  EXPECT_EQ(std::string(buffer), "STRING: ABC");
+
+  result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456);
+  EXPECT_EQ(result, 14);
+  EXPECT_EQ(std::string(buffer), "NUMBER: 123456");
+
+  result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 1234567);
+  EXPECT_EQ(result, 15);
+  EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+  result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 12345678);
+  EXPECT_EQ(result, 16);
+  EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+  result = SNPrintF(buffer, sizeof(buffer), "NUMBER: %d", 123456789);
+  EXPECT_EQ(result, 17);
+  EXPECT_EQ(std::string(buffer), "NUMBER: 1234567");
+
+  result = SNPrintF(nullptr, 0, "Just checking the %s of the output.", "size");
+  EXPECT_EQ(result, 37);
+}
+
+TEST(StrFormat, BehavesAsDocumented) {
+  std::string s = absl::StrFormat("%s, %d!", "Hello", 123);
+  EXPECT_EQ("Hello, 123!", s);
+  // The format of a replacement is
+  // '%'[position][flags][width['.'precision]][length_modifier][format]
+  EXPECT_EQ(absl::StrFormat("%1$+3.2Lf", 1.1), "+1.10");
+  // Text conversion:
+  //     "c" - Character.              Eg: 'a' -> "A", 20 -> " "
+  EXPECT_EQ(StrFormat("%c", 'a'), "a");
+  EXPECT_EQ(StrFormat("%c", 0x20), " ");
+  //           Formats char and integral types: int, long, uint64_t, etc.
+  EXPECT_EQ(StrFormat("%c", int{'a'}), "a");
+  EXPECT_EQ(StrFormat("%c", long{'a'}), "a");  // NOLINT
+  EXPECT_EQ(StrFormat("%c", uint64_t{'a'}), "a");
+  //     "s" - std::string                  Eg: "C" -> "C", std::string("C++") -> "C++"
+  //           Formats std::string, char*, string_view, and Cord.
+  EXPECT_EQ(StrFormat("%s", "C"), "C");
+  EXPECT_EQ(StrFormat("%s", std::string("C++")), "C++");
+  EXPECT_EQ(StrFormat("%s", string_view("view")), "view");
+  // Integral Conversion
+  //     These format integral types: char, int, long, uint64_t, etc.
+  EXPECT_EQ(StrFormat("%d", char{10}), "10");
+  EXPECT_EQ(StrFormat("%d", int{10}), "10");
+  EXPECT_EQ(StrFormat("%d", long{10}), "10");  // NOLINT
+  EXPECT_EQ(StrFormat("%d", uint64_t{10}), "10");
+  //     d,i - signed decimal          Eg: -10 -> "-10"
+  EXPECT_EQ(StrFormat("%d", -10), "-10");
+  EXPECT_EQ(StrFormat("%i", -10), "-10");
+  //      o  - octal                   Eg:  10 -> "12"
+  EXPECT_EQ(StrFormat("%o", 10), "12");
+  //      u  - unsigned decimal        Eg:  10 -> "10"
+  EXPECT_EQ(StrFormat("%u", 10), "10");
+  //     x/X - lower,upper case hex    Eg:  10 -> "a"/"A"
+  EXPECT_EQ(StrFormat("%x", 10), "a");
+  EXPECT_EQ(StrFormat("%X", 10), "A");
+  // Floating-point, with upper/lower-case output.
+  //     These format floating points types: float, double, long double, etc.
+  EXPECT_EQ(StrFormat("%.1f", float{1}), "1.0");
+  EXPECT_EQ(StrFormat("%.1f", double{1}), "1.0");
+  const long double long_double = 1.0;
+  EXPECT_EQ(StrFormat("%.1f", long_double), "1.0");
+  //     These also format integral types: char, int, long, uint64_t, etc.:
+  EXPECT_EQ(StrFormat("%.1f", char{1}), "1.0");
+  EXPECT_EQ(StrFormat("%.1f", int{1}), "1.0");
+  EXPECT_EQ(StrFormat("%.1f", long{1}), "1.0");  // NOLINT
+  EXPECT_EQ(StrFormat("%.1f", uint64_t{1}), "1.0");
+  //     f/F - decimal.                Eg: 123456789 -> "123456789.000000"
+  EXPECT_EQ(StrFormat("%f", 123456789), "123456789.000000");
+  EXPECT_EQ(StrFormat("%F", 123456789), "123456789.000000");
+  //     e/E - exponentiated           Eg: .01 -> "1.00000e-2"/"1.00000E-2"
+  EXPECT_EQ(StrFormat("%e", .01), "1.000000e-02");
+  EXPECT_EQ(StrFormat("%E", .01), "1.000000E-02");
+  //     g/G - exponentiate to fit     Eg: .01 -> "0.01", 1e10 ->"1e+10"/"1E+10"
+  EXPECT_EQ(StrFormat("%g", .01), "0.01");
+  EXPECT_EQ(StrFormat("%g", 1e10), "1e+10");
+  EXPECT_EQ(StrFormat("%G", 1e10), "1E+10");
+  //     a/A - lower,upper case hex    Eg: -3.0 -> "-0x1.8p+1"/"-0X1.8P+1"
+
+// On NDK r16, there is a regression in hexfloat formatting.
+#if !defined(__NDK_MAJOR__) || __NDK_MAJOR__ != 16
+  EXPECT_EQ(StrFormat("%.1a", -3.0), "-0x1.8p+1");  // .1 to fix MSVC output
+  EXPECT_EQ(StrFormat("%.1A", -3.0), "-0X1.8P+1");  // .1 to fix MSVC output
+#endif
+
+  // Other conversion
+  int64_t value = 0x7ffdeb6;
+  auto ptr_value = static_cast<uintptr_t>(value);
+  const int& something = *reinterpret_cast<const int*>(ptr_value);
+  EXPECT_EQ(StrFormat("%p", &something), StrFormat("0x%x", ptr_value));
+
+  // Output widths are supported, with optional flags.
+  EXPECT_EQ(StrFormat("%3d", 1), "  1");
+  EXPECT_EQ(StrFormat("%3d", 123456), "123456");
+  EXPECT_EQ(StrFormat("%06.2f", 1.234), "001.23");
+  EXPECT_EQ(StrFormat("%+d", 1), "+1");
+  EXPECT_EQ(StrFormat("% d", 1), " 1");
+  EXPECT_EQ(StrFormat("%-4d", -1), "-1  ");
+  EXPECT_EQ(StrFormat("%#o", 10), "012");
+  EXPECT_EQ(StrFormat("%#x", 15), "0xf");
+  EXPECT_EQ(StrFormat("%04d", 8), "0008");
+  // Posix positional substitution.
+  EXPECT_EQ(absl::StrFormat("%2$s, %3$s, %1$s!", "vici", "veni", "vidi"),
+            "veni, vidi, vici!");
+  // Length modifiers are ignored.
+  EXPECT_EQ(StrFormat("%hhd", int{1}), "1");
+  EXPECT_EQ(StrFormat("%hd", int{1}), "1");
+  EXPECT_EQ(StrFormat("%ld", int{1}), "1");
+  EXPECT_EQ(StrFormat("%lld", int{1}), "1");
+  EXPECT_EQ(StrFormat("%Ld", int{1}), "1");
+  EXPECT_EQ(StrFormat("%jd", int{1}), "1");
+  EXPECT_EQ(StrFormat("%zd", int{1}), "1");
+  EXPECT_EQ(StrFormat("%td", int{1}), "1");
+  EXPECT_EQ(StrFormat("%qd", int{1}), "1");
+}
+
+using str_format_internal::ExtendedParsedFormat;
+using str_format_internal::ParsedFormatBase;
+
+struct SummarizeConsumer {
+  std::string* out;
+  explicit SummarizeConsumer(std::string* out) : out(out) {}
+
+  bool Append(string_view s) {
+    *out += "[" + std::string(s) + "]";
+    return true;
+  }
+
+  bool ConvertOne(const str_format_internal::UnboundConversion& conv,
+                  string_view s) {
+    *out += "{";
+    *out += std::string(s);
+    *out += ":";
+    *out += std::to_string(conv.arg_position) + "$";
+    if (conv.width.is_from_arg()) {
+      *out += std::to_string(conv.width.get_from_arg()) + "$*";
+    }
+    if (conv.precision.is_from_arg()) {
+      *out += "." + std::to_string(conv.precision.get_from_arg()) + "$*";
+    }
+    *out += conv.conv.Char();
+    *out += "}";
+    return true;
+  }
+};
+
+std::string SummarizeParsedFormat(const ParsedFormatBase& pc) {
+  std::string out;
+  if (!pc.ProcessFormat(SummarizeConsumer(&out))) out += "!";
+  return out;
+}
+
+class ParsedFormatTest : public testing::Test {};
+
+TEST_F(ParsedFormatTest, SimpleChecked) {
+  EXPECT_EQ("[ABC]{d:1$d}[DEF]",
+            SummarizeParsedFormat(ParsedFormat<'d'>("ABC%dDEF")));
+  EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}",
+            SummarizeParsedFormat(ParsedFormat<'s', 'd', 'f'>("%sFFF%dZZZ%f")));
+  EXPECT_EQ("{s:1$s}[ ]{.*d:3$.2$*d}",
+            SummarizeParsedFormat(ParsedFormat<'s', '*', 'd'>("%s %.*d")));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedCorrect) {
+  auto f = ParsedFormat<'d'>::New("ABC%dDEF");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
+
+  std::string format = "%sFFF%dZZZ%f";
+  auto f2 = ParsedFormat<'s', 'd', 'f'>::New(format);
+
+  ASSERT_TRUE(f2);
+  EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+  f2 = ParsedFormat<'s', 'd', 'f'>::New("%s %d %f");
+
+  ASSERT_TRUE(f2);
+  EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+  auto star = ParsedFormat<'*', 'd'>::New("%*d");
+  ASSERT_TRUE(star);
+  EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
+
+  auto dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d");
+  ASSERT_TRUE(dollar);
+  EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
+  // with reuse
+  dollar = ParsedFormat<'d', 's'>::New("%2$s %1$d %1$d");
+  ASSERT_TRUE(dollar);
+  EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
+            SummarizeParsedFormat(*dollar));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedIgnoredArgs) {
+  EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC")));
+  EXPECT_FALSE((ParsedFormat<'d', 's'>::New("%dABC")));
+  EXPECT_FALSE((ParsedFormat<'d', 's'>::New("ABC%2$s")));
+  auto f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
+  f = ParsedFormat<'d', 's'>::NewAllowIgnored("%dABC");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
+  f = ParsedFormat<'d', 's'>::NewAllowIgnored("ABC%2$s");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedUnsupported) {
+  EXPECT_FALSE(ParsedFormat<'d'>::New("%1$d %1$x"));
+  EXPECT_FALSE(ParsedFormat<'x'>::New("%1$d %1$x"));
+}
+
+TEST_F(ParsedFormatTest, SimpleUncheckedIncorrect) {
+  EXPECT_FALSE(ParsedFormat<'d'>::New(""));
+
+  EXPECT_FALSE(ParsedFormat<'d'>::New("ABC%dDEF%d"));
+
+  std::string format = "%sFFF%dZZZ%f";
+  EXPECT_FALSE((ParsedFormat<'s', 'd', 'g'>::New(format)));
+}
+
+using str_format_internal::Conv;
+
+TEST_F(ParsedFormatTest, UncheckedCorrect) {
+  auto f = ExtendedParsedFormat<Conv::d>::New("ABC%dDEF");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]{d:1$d}[DEF]", SummarizeParsedFormat(*f));
+
+  std::string format = "%sFFF%dZZZ%f";
+  auto f2 =
+      ExtendedParsedFormat<Conv::string, Conv::d, Conv::floating>::New(format);
+
+  ASSERT_TRUE(f2);
+  EXPECT_EQ("{s:1$s}[FFF]{d:2$d}[ZZZ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+  f2 = ExtendedParsedFormat<Conv::string, Conv::d, Conv::floating>::New(
+      "%s %d %f");
+
+  ASSERT_TRUE(f2);
+  EXPECT_EQ("{s:1$s}[ ]{d:2$d}[ ]{f:3$f}", SummarizeParsedFormat(*f2));
+
+  auto star = ExtendedParsedFormat<Conv::star, Conv::d>::New("%*d");
+  ASSERT_TRUE(star);
+  EXPECT_EQ("{*d:2$1$*d}", SummarizeParsedFormat(*star));
+
+  auto dollar = ExtendedParsedFormat<Conv::d, Conv::s>::New("%2$s %1$d");
+  ASSERT_TRUE(dollar);
+  EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}", SummarizeParsedFormat(*dollar));
+  // with reuse
+  dollar = ExtendedParsedFormat<Conv::d, Conv::s>::New("%2$s %1$d %1$d");
+  ASSERT_TRUE(dollar);
+  EXPECT_EQ("{2$s:2$s}[ ]{1$d:1$d}[ ]{1$d:1$d}",
+            SummarizeParsedFormat(*dollar));
+}
+
+TEST_F(ParsedFormatTest, UncheckedIgnoredArgs) {
+  EXPECT_FALSE((ExtendedParsedFormat<Conv::d, Conv::s>::New("ABC")));
+  EXPECT_FALSE((ExtendedParsedFormat<Conv::d, Conv::s>::New("%dABC")));
+  EXPECT_FALSE((ExtendedParsedFormat<Conv::d, Conv::s>::New("ABC%2$s")));
+  auto f = ExtendedParsedFormat<Conv::d, Conv::s>::NewAllowIgnored("ABC");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]", SummarizeParsedFormat(*f));
+  f = ExtendedParsedFormat<Conv::d, Conv::s>::NewAllowIgnored("%dABC");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("{d:1$d}[ABC]", SummarizeParsedFormat(*f));
+  f = ExtendedParsedFormat<Conv::d, Conv::s>::NewAllowIgnored("ABC%2$s");
+  ASSERT_TRUE(f);
+  EXPECT_EQ("[ABC]{2$s:2$s}", SummarizeParsedFormat(*f));
+}
+
+TEST_F(ParsedFormatTest, UncheckedMultipleTypes) {
+  auto dx = ExtendedParsedFormat<Conv::d | Conv::x>::New("%1$d %1$x");
+  EXPECT_TRUE(dx);
+  EXPECT_EQ("{1$d:1$d}[ ]{1$x:1$x}", SummarizeParsedFormat(*dx));
+
+  dx = ExtendedParsedFormat<Conv::d | Conv::x>::New("%1$d");
+  EXPECT_TRUE(dx);
+  EXPECT_EQ("{1$d:1$d}", SummarizeParsedFormat(*dx));
+}
+
+TEST_F(ParsedFormatTest, UncheckedIncorrect) {
+  EXPECT_FALSE(ExtendedParsedFormat<Conv::d>::New(""));
+
+  EXPECT_FALSE(ExtendedParsedFormat<Conv::d>::New("ABC%dDEF%d"));
+
+  std::string format = "%sFFF%dZZZ%f";
+  EXPECT_FALSE((ExtendedParsedFormat<Conv::s, Conv::d, Conv::g>::New(format)));
+}
+
+TEST_F(ParsedFormatTest, RegressionMixPositional) {
+  EXPECT_FALSE((ExtendedParsedFormat<Conv::d, Conv::o>::New("%1$d %o")));
+}
+
+}  // namespace
+}  // namespace absl