blob: 4d462d0a590ba62f104256d67b93178989a4716f [file] [log] [blame]
// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "foomatic_shell/grammar.h"
#include <memory>
#include <string>
#include <vector>
namespace foomatic_shell {
// Converts a script into a sequences of Tokens. See the struct Token defined
// in grammar.h.
class Scanner {
// Constructor. |data| is a reference to the input buffer. The input buffer
// must be constant and valid during the lifetime of this object.
explicit Scanner(const std::string& data);
Scanner(const Scanner&) = delete;
Scanner(Scanner&&) = delete;
// Parses the input given in the constructor and stores the resultant
// sequence in |tokens|. Returns true when succeed. Otherwise it stops
// on the first error and returns false. |tokens| must not be nullptr.
bool ParseWholeInput(std::vector<Token>* tokens);
// Returns the current position of the scanner as an iterator of the string
// given in the constructor. It is used to report a position of the error
// when the method ParseWholeInput(...) fails.
std::string::const_iterator GetPosition() const;
// Returns an error message if the call ParseWholeInput(...) failed.
// Returns an empty string if the call succeeded.
const std::string& GetMessage() const { return message_; }
bool ParseLiteralString(std::vector<Token>* tokens);
bool ParseExecutedString(std::vector<Token>* tokens);
bool ParseInterpretedString(std::vector<Token>* tokens);
bool ParseNativeString(std::vector<Token>* tokens);
class Input;
std::unique_ptr<Input> data_;
std::string message_;
} // namespace foomatic_shell