Export of internal Abseil changes

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0b3113ff8d252be11c35d8a77cdb23cc03e993d2 by Benjamin Barenblat <bbaren@google.com>:

Correct Apache license headers

These files have always been licensed under the Apache license (per the
repository LICENSE), but they lacked headers to locally indicate that
fact. Add the appropriate headers.

PiperOrigin-RevId: 310223650

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4f92b0819781279c02b48bcfce4c10d547e35a49 by Greg Falcon <gfalcon@google.com>:

Internal change

PiperOrigin-RevId: 310223203

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378cab69ce3290d20b48d839daa988c3e63ed031 by Matthew Brown <matthewbr@google.com>:

Internal Change

PiperOrigin-RevId: 310180198

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93a1851be0f3726f7435cef56afaa1b8664f40e7 by Gennadiy Rozental <rogeeff@google.com>:

Internal change

PiperOrigin-RevId: 310003669

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fbee3221cb1f8717fdf34e1cc0ea248a7719227a by Gennadiy Rozental <rogeeff@google.com>:

Make 4 argument version of ParseFrom interface private in CommandLineFlag. Instroduce 2 argument version of this interface.

PiperOrigin-RevId: 309995363
GitOrigin-RevId: 0b3113ff8d252be11c35d8a77cdb23cc03e993d2
Change-Id: Ibfdf948d3d081f5630ce7ebff992ab85c75cecba

4 files changed, 70 insertions, 38 deletions

diff --git a/absl/flags/internal/commandlineflag.cc b/absl/flags/internal/commandlineflag.cc
index f1e50d01ec8d..c919fa1be8a7 100644
--- a/absl/flags/internal/commandlineflag.cc
+++ b/absl/flags/internal/commandlineflag.cc
@@ -23,6 +23,11 @@ FlagStateInterface::~FlagStateInterface() {}
 
 bool CommandLineFlag::IsRetired() const { return false; }
 
+bool CommandLineFlag::ParseFrom(absl::string_view value, std::string* error) {
+  return ParseFrom(value, flags_internal::SET_FLAGS_VALUE,
+                   flags_internal::kProgrammaticChange, error);
+}
+
 FlagFastTypeId PrivateHandleInterface::TypeId(const CommandLineFlag& flag) {
   return flag.TypeId();
 }
@@ -42,6 +47,14 @@ void PrivateHandleInterface::CheckDefaultValueParsingRoundtrip(
   flag.CheckDefaultValueParsingRoundtrip();
 }
 
+bool PrivateHandleInterface::ParseFrom(CommandLineFlag* flag,
+                                       absl::string_view value,
+                                       flags_internal::FlagSettingMode set_mode,
+                                       flags_internal::ValueSource source,
+                                       std::string* error) {
+  return flag->ParseFrom(value, set_mode, source, error);
+}
+
 }  // namespace flags_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
diff --git a/absl/flags/internal/commandlineflag.h b/absl/flags/internal/commandlineflag.h
index f60204dd6256..af5e05d59984 100644
--- a/absl/flags/internal/commandlineflag.h
+++ b/absl/flags/internal/commandlineflag.h
@@ -140,6 +140,17 @@ class CommandLineFlag {
 
   // Sets the value of the flag based on specified string `value`. If the flag
   // was successfully set to new value, it returns true. Otherwise, sets `error`
+  // to indicate the error, leaves the flag unchanged, and returns false.
+  bool ParseFrom(absl::string_view value, std::string* error);
+
+ protected:
+  ~CommandLineFlag() = default;
+
+ private:
+  friend class PrivateHandleInterface;
+
+  // Sets the value of the flag based on specified string `value`. If the flag
+  // was successfully set to new value, it returns true. Otherwise, sets `error`
   // to indicate the error, leaves the flag unchanged, and returns false. There
   // are three ways to set the flag's value:
   //  * Update the current flag value
@@ -151,12 +162,6 @@ class CommandLineFlag {
                          flags_internal::ValueSource source,
                          std::string* error) = 0;
 
- protected:
-  ~CommandLineFlag() = default;
-
- private:
-  friend class PrivateHandleInterface;
-
   // Returns id of the flag's value type.
   virtual FlagFastTypeId TypeId() const = 0;
 
@@ -168,7 +173,6 @@ class CommandLineFlag {
   // the dst based on the current flag's value.
   virtual void Read(void* dst) const = 0;
 
-  // Interfaces to operate on validators.
   // Validates supplied value usign validator or parseflag routine
   virtual bool ValidateInputValue(absl::string_view value) const = 0;
 
@@ -194,6 +198,10 @@ class PrivateHandleInterface {
 
   // Access to CommandLineFlag::CheckDefaultValueParsingRoundtrip.
   static void CheckDefaultValueParsingRoundtrip(const CommandLineFlag& flag);
+
+  static bool ParseFrom(CommandLineFlag* flag, absl::string_view value,
+                        flags_internal::FlagSettingMode set_mode,
+                        flags_internal::ValueSource source, std::string* error);
 };
 
 // This macro is the "source of truth" for the list of supported flag built-in
diff --git a/absl/flags/internal/commandlineflag_test.cc b/absl/flags/internal/commandlineflag_test.cc
index c31679f95e7a..4aeb3bf4dd3c 100644
--- a/absl/flags/internal/commandlineflag_test.cc
+++ b/absl/flags/internal/commandlineflag_test.cc
@@ -122,49 +122,53 @@ TEST_F(CommandLineFlagTest, TestParseFromCurrentValue) {
   auto* flag_01 = flags::FindCommandLineFlag("int_flag");
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(flag_01->ParseFrom("11", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "11", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(flag_01->ParseFrom("-123", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "-123", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(!flag_01->ParseFrom("xyz", flags::SET_FLAGS_VALUE,
-                                  flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(!flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
   EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(!flag_01->ParseFrom("A1", flags::SET_FLAGS_VALUE,
-                                  flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(!flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "A1", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
   EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(flag_01->ParseFrom("0x10", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "0x10", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
   EXPECT_FALSE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(flag_01->ParseFrom("011", flags::SET_FLAGS_VALUE,
-                                 flags::kCommandLine, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "011", flags::SET_FLAGS_VALUE, flags::kCommandLine, &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
   EXPECT_TRUE(flag_01->IsSpecifiedOnCommandLine());
 
-  EXPECT_TRUE(!flag_01->ParseFrom("", flags::SET_FLAGS_VALUE,
-                                  flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(!flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, &err));
   EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
 
   auto* flag_02 = flags::FindCommandLineFlag("string_flag");
-  EXPECT_TRUE(flag_02->ParseFrom("xyz", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_02, "xyz", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
 
-  EXPECT_TRUE(flag_02->ParseFrom("", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_02, "", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange, &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
 }
 
@@ -175,14 +179,16 @@ TEST_F(CommandLineFlagTest, TestParseFromDefaultValue) {
 
   auto* flag_01 = flags::FindCommandLineFlag("int_flag");
 
-  EXPECT_TRUE(flag_01->ParseFrom("111", flags::SET_FLAGS_DEFAULT,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "111", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(flag_01->DefaultValue(), "111");
 
   auto* flag_02 = flags::FindCommandLineFlag("string_flag");
 
-  EXPECT_TRUE(flag_02->ParseFrom("abc", flags::SET_FLAGS_DEFAULT,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_02, "abc", flags::SET_FLAGS_DEFAULT, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(flag_02->DefaultValue(), "abc");
 }
 
@@ -193,22 +199,26 @@ TEST_F(CommandLineFlagTest, TestParseFromIfDefault) {
 
   auto* flag_01 = flags::FindCommandLineFlag("int_flag");
 
-  EXPECT_TRUE(flag_01->ParseFrom("22", flags::SET_FLAG_IF_DEFAULT,
-                                 flags::kProgrammaticChange, &err))
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "22", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+      &err))
       << err;
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
 
-  EXPECT_TRUE(flag_01->ParseFrom("33", flags::SET_FLAG_IF_DEFAULT,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
   // EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
 
   // Reset back to default value
-  EXPECT_TRUE(flag_01->ParseFrom("201", flags::SET_FLAGS_VALUE,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "201", flags::SET_FLAGS_VALUE, flags::kProgrammaticChange,
+      &err));
 
-  EXPECT_TRUE(flag_01->ParseFrom("33", flags::SET_FLAG_IF_DEFAULT,
-                                 flags::kProgrammaticChange, &err));
+  EXPECT_TRUE(flags::PrivateHandleInterface::ParseFrom(
+      flag_01, "33", flags::SET_FLAG_IF_DEFAULT, flags::kProgrammaticChange,
+      &err));
   EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
   // EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
 }
diff --git a/absl/flags/internal/type_erased.cc b/absl/flags/internal/type_erased.cc
index 5038625be761..adeb7a1541ab 100644
--- a/absl/flags/internal/type_erased.cc
+++ b/absl/flags/internal/type_erased.cc
@@ -56,7 +56,8 @@ bool SetCommandLineOptionWithMode(absl::string_view name,
   if (!flag || flag->IsRetired()) return false;
 
   std::string error;
-  if (!flag->ParseFrom(value, set_mode, kProgrammaticChange, &error)) {
+  if (!flags_internal::PrivateHandleInterface::ParseFrom(
+          flag, value, set_mode, kProgrammaticChange, &error)) {
     // Errors here are all of the form: the provided name was a recognized
     // flag, but the value was invalid (bad type, or validation failed).
     flags_internal::ReportUsageError(error, false);