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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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
*
* http://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.
*/
#ifndef ART_CMDLINE_CMDLINE_TYPE_PARSER_H_
#define ART_CMDLINE_CMDLINE_TYPE_PARSER_H_
#include "cmdline_parse_result.h"
namespace art {
// Base class for user-defined CmdlineType<T> specializations.
//
// Not strictly necessary, but if the specializations fail to Define all of these functions
// the compilation will fail.
template <typename T>
struct CmdlineTypeParser {
// Return value of parsing attempts. Represents a Success(T value) or an Error(int code)
using Result = CmdlineParseResult<T>;
// Parse a single value for an argument definition out of the wildcard component.
//
// e.g. if the argument definition was "foo:_", and the user-provided input was "foo:bar",
// then args is "bar".
Result Parse(const std::string& args ATTRIBUTE_UNUSED) {
assert(false);
return Result::Failure("Missing type specialization and/or value map");
}
// Parse a value and append it into the existing value so far, for argument
// definitions which are marked with AppendValues().
//
// The value is parsed out of the wildcard component as in Parse.
//
// If the initial value does not exist yet, a default value is created by
// value-initializing with 'T()'.
Result ParseAndAppend(const std::string& args ATTRIBUTE_UNUSED,
T& existing_value ATTRIBUTE_UNUSED) {
assert(false);
return Result::Failure("Missing type specialization and/or value map");
}
// Runtime type name of T, so that we can print more useful error messages.
static const char* Name() { assert(false); return "UnspecializedType"; }
// Whether or not your type can parse argument definitions defined without a "_"
// e.g. -Xenable-profiler just mutates the existing profiler struct in-place
// so it doesn't need to do any parsing other than token recognition.
//
// If this is false, then either the argument definition has a _, from which the parsing
// happens, or the tokens get mapped to a value list/map from which a 1:1 matching occurs.
//
// This should almost *always* be false!
static constexpr bool kCanParseBlankless = false;
protected:
// Don't accidentally initialize instances of this directly; they will assert at runtime.
CmdlineTypeParser() = default;
};
} // namespace art
#endif // ART_CMDLINE_CMDLINE_TYPE_PARSER_H_
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