1 files changed, 108 insertions, 0 deletions
diff --git a/absl/flags/internal/type_erased.cc b/absl/flags/internal/type_erased.cc
new file mode 100644
index 00000000..6b91b261
--- /dev/null
+++ b/absl/flags/internal/type_erased.cc
@@ -0,0 +1,108 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/type_erased.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/flags/config.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+inline namespace lts_2019_08_08 {
+namespace flags_internal {
+
+bool GetCommandLineOption(absl::string_view name, std::string* value) {
+  if (name.empty()) return false;
+  assert(value);
+
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag == nullptr || flag->IsRetired()) {
+    return false;
+  }
+
+  *value = flag->CurrentValue();
+  return true;
+}
+
+bool GetCommandLineFlagInfo(absl::string_view name,
+                            CommandLineFlagInfo* OUTPUT) {
+  if (name.empty()) return false;
+
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag == nullptr || flag->IsRetired()) {
+    return false;
+  }
+
+  assert(OUTPUT);
+  FillCommandLineFlagInfo(flag, OUTPUT);
+  return true;
+}
+
+CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name) {
+  CommandLineFlagInfo info;
+  if (!GetCommandLineFlagInfo(name, &info)) {
+    ABSL_INTERNAL_LOG(FATAL, absl::StrCat("Flag '", name, "' does not exist"));
+  }
+  return info;
+}
+
+// --------------------------------------------------------------------
+
+bool SetCommandLineOption(absl::string_view name, absl::string_view value) {
+  return SetCommandLineOptionWithMode(name, value,
+                                      flags_internal::SET_FLAGS_VALUE);
+}
+
+bool SetCommandLineOptionWithMode(absl::string_view name,
+                                  absl::string_view value,
+                                  FlagSettingMode set_mode) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+
+  if (!flag || flag->IsRetired()) return false;
+
+  std::string error;
+  if (!flag->SetFromString(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);
+    return false;
+  }
+
+  return true;
+}
+
+// --------------------------------------------------------------------
+
+bool IsValidFlagValue(absl::string_view name, absl::string_view value) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+
+  return flag != nullptr &&
+         (flag->IsRetired() || flag->ValidateInputValue(value));
+}
+
+// --------------------------------------------------------------------
+
+bool SpecifiedOnCommandLine(absl::string_view name) {
+  CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+  if (flag != nullptr && !flag->IsRetired()) {
+    return flag->IsSpecifiedOnCommandLine();
+  }
+  return false;
+}
+
+}  // namespace flags_internal
+}  // inline namespace lts_2019_08_08
+}  // namespace absl