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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_COMPONENTS_ONC_VARIABLE_EXPANDER_H_
#define CHROMEOS_COMPONENTS_ONC_VARIABLE_EXPANDER_H_
#include <string>
#include "base/component_export.h"
#include "base/containers/flat_map.h"
namespace base {
class Value;
}
namespace chromeos {
// Expands variables in a string or base::Value. Allows setting which variables
// to expand and the corresponding values. Also supports substrings with given
// zero-based position or position/count, e.g. if the variable name is
// "machine_name" and the value is "chromebook", then the this class expands
// "${machine_name}" to "chromebook",
// "${machine_name,6}" to "book" (position 6 of "chromebook" to end) and
// "${machine_name,2,4}" to "rome" (4 characters from position 2).
// Sample usage:
// std::string str = "I run ${machine_name,0,6} on my ${machine_name}";
// VariableExpander expander({{"machine_name", "chromebook"}});
// expander.ExpandString(&str);
// // str is now "I run chrome on my chromebook"
class COMPONENT_EXPORT(CHROMEOS_ONC) VariableExpander {
public:
// Takes a map of variables to values.
explicit VariableExpander(base::flat_map<std::string, std::string> variables);
VariableExpander(const VariableExpander&) = delete;
VariableExpander& operator=(const VariableExpander&) = delete;
~VariableExpander();
// Expands all variables in |str|. Returns true if no error has occurred.
// Returns false if at least one variable was malformed and could not be
// expanded (the good ones are still expanded).
bool ExpandString(std::string* str) const;
// Calls ExpandString on every string contained in |value|. Recursively
// handles all hierarchy levels. Returns true if no error has occurred.
// Returns false if at least one variable was malformed and could not be
// expanded (the good ones are still expanded).
bool ExpandValue(base::Value* value) const;
private:
// Maps variable -> value.
const base::flat_map<std::string, std::string> variables_;
};
} // namespace chromeos
#endif // CHROMEOS_COMPONENTS_ONC_VARIABLE_EXPANDER_H_
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