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135 lines
3.3 KiB
C++
135 lines
3.3 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_I18N_CHAR_ITERATOR_H_
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#define BASE_I18N_CHAR_ITERATOR_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <string>
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#include "base/i18n/base_i18n_export.h"
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#include "base/macros.h"
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#include "base/strings/string16.h"
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#include "build/build_config.h"
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// The CharIterator classes iterate through the characters in UTF8 and
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// UTF16 strings. Example usage:
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//
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// UTF8CharIterator iter(&str);
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// while (!iter.end()) {
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// VLOG(1) << iter.get();
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// iter.Advance();
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// }
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#if defined(OS_WIN)
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typedef unsigned char uint8_t;
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#endif
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namespace base {
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namespace i18n {
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class BASE_I18N_EXPORT UTF8CharIterator {
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public:
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// Requires |str| to live as long as the UTF8CharIterator does.
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explicit UTF8CharIterator(const std::string* str);
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~UTF8CharIterator();
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// Return the starting array index of the current character within the
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// string.
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int32_t array_pos() const { return array_pos_; }
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// Return the logical index of the current character, independent of the
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// number of bytes each character takes.
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int32_t char_pos() const { return char_pos_; }
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// Return the current char.
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int32_t get() const { return char_; }
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// Returns true if we're at the end of the string.
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bool end() const { return array_pos_ == len_; }
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// Advance to the next actual character. Returns false if we're at the
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// end of the string.
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bool Advance();
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private:
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// The string we're iterating over.
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const uint8_t* str_;
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// The length of the encoded string.
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int32_t len_;
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// Array index.
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int32_t array_pos_;
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// The next array index.
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int32_t next_pos_;
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// Character index.
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int32_t char_pos_;
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// The current character.
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int32_t char_;
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DISALLOW_COPY_AND_ASSIGN(UTF8CharIterator);
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};
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class BASE_I18N_EXPORT UTF16CharIterator {
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public:
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// Requires |str| to live as long as the UTF16CharIterator does.
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explicit UTF16CharIterator(const string16* str);
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UTF16CharIterator(const char16* str, size_t str_len);
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~UTF16CharIterator();
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// Return the starting array index of the current character within the
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// string.
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int32_t array_pos() const { return array_pos_; }
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// Return the logical index of the current character, independent of the
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// number of codewords each character takes.
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int32_t char_pos() const { return char_pos_; }
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// Return the current char.
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int32_t get() const { return char_; }
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// Returns true if we're at the end of the string.
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bool end() const { return array_pos_ == len_; }
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// Advance to the next actual character. Returns false if we're at the
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// end of the string.
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bool Advance();
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private:
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// Fills in the current character we found and advances to the next
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// character, updating all flags as necessary.
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void ReadChar();
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// The string we're iterating over.
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const char16* str_;
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// The length of the encoded string.
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int32_t len_;
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// Array index.
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int32_t array_pos_;
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// The next array index.
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int32_t next_pos_;
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// Character index.
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int32_t char_pos_;
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// The current character.
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int32_t char_;
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DISALLOW_COPY_AND_ASSIGN(UTF16CharIterator);
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};
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} // namespace i18n
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} // namespace base
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#endif // BASE_I18N_CHAR_ITERATOR_H_
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