59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Copyright 2014 Google LLC. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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//
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// Flag validation help functions.
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#ifndef APP_VALIDATE_FLAG_H_
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#define APP_VALIDATE_FLAG_H_
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#include <string>
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#include "packager/base/strings/stringprintf.h"
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namespace shaka {
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/// Format and print error message.
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/// @param error_message specifies the error message.
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void PrintError(const std::string& error_message);
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/// Format and print warning message.
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/// @param warning_message specifies the warning message.
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void PrintWarning(const std::string& warning_message);
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/// Validate a flag against the given condition.
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/// @param flag_name is the name of the flag.
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/// @param flag_value is the value of the flag.
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/// @param condition,optional determines how the flag should be validated. If
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/// condition is true and optional is false, then this flag is required
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// and cannot be empty; If condition is false, then this flag should
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// not be set.
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/// @param label specifies the label associated with the condition. It is used
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/// to generate the error message on validation failure.
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/// @return true on success, false otherwise.
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template <class FlagType>
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bool ValidateFlag(const char* flag_name,
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const FlagType& flag_value,
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bool condition,
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bool optional,
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const char* label) {
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if (flag_value.empty()) {
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if (!optional && condition) {
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PrintError(
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base::StringPrintf("--%s is required if %s.", flag_name, label));
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return false;
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}
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} else if (!condition) {
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PrintError(base::StringPrintf(
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"--%s should be specified only if %s.", flag_name, label));
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return false;
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}
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return true;
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}
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} // namespace shaka
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#endif // APP_VALIDATE_FLAG_H_
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