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// Copyright 2019 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_ASH_COMPONENTS_STRING_MATCHING_TOKENIZED_STRING_CHAR_ITERATOR_H_
#define CHROMEOS_ASH_COMPONENTS_STRING_MATCHING_TOKENIZED_STRING_CHAR_ITERATOR_H_
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include "base/memory/raw_ref.h"
#include "chromeos/ash/components/string_matching/tokenized_string.h"
namespace base::i18n {
class UTF16CharIterator;
}
namespace ash::string_matching {
// An UTF16 char iterator for a TokenizedString.
class TokenizedStringCharIterator {
public:
struct State {
State();
State(size_t token_index, int char_index);
size_t token_index;
int32_t char_index;
};
// Requires |tokenized| out-lives this iterator.
explicit TokenizedStringCharIterator(const TokenizedString& tokenized);
TokenizedStringCharIterator(const TokenizedStringCharIterator&) = delete;
TokenizedStringCharIterator& operator=(const TokenizedStringCharIterator&) =
delete;
~TokenizedStringCharIterator();
// Advances to the next char. Returns false if there is no next char.
bool NextChar();
// Advances to the first char of the next token. Returns false if there is
// no next token.
bool NextToken();
// Returns the current char if there is one. Otherwise, returns 0.
int32_t Get() const;
// Returns the array index in original text of the tokenized string that is
// passed in constructor.
int32_t GetArrayPos() const;
// Returns the number of UTF16 code units for the current char.
size_t GetCharSize() const;
// Returns true if the current char is the first char of the current token.
bool IsFirstCharOfToken() const;
// Returns true if the current char is the second char of the current token.
bool IsSecondCharOfToken() const;
// Helpers to get and restore the iterator's state.
State GetState() const;
void SetState(const State& state);
// Returns true if the iterator is at the end.
bool end() const { return !current_token_iter_; }
private:
void CreateTokenCharIterator();
const raw_ref<const TokenizedString::Tokens> tokens_;
const raw_ref<const TokenizedString::Mappings> mappings_;
size_t current_token_;
std::unique_ptr<base::i18n::UTF16CharIterator> current_token_iter_;
};
} // namespace ash::string_matching
#endif // CHROMEOS_ASH_COMPONENTS_STRING_MATCHING_TOKENIZED_STRING_CHAR_ITERATOR_H_
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