/* * Copyright (C) 2012 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 LATINIME_TERMINAL_ATTRIBUTES_H #define LATINIME_TERMINAL_ATTRIBUTES_H #include "binary_format.h" namespace latinime { /** * This class encapsulates information about a terminal that allows to * retrieve local node attributes like the list of shortcuts without * exposing the format structure to the client. */ class TerminalAttributes { public: class ShortcutIterator { const uint8_t *const mDict; int mPos; bool mHasNextShortcutTarget; public: ShortcutIterator(const uint8_t *dict, const int pos, const uint8_t flags) : mDict(dict), mPos(pos), mHasNextShortcutTarget(0 != (flags & BinaryFormat::FLAG_HAS_SHORTCUT_TARGETS)) { } inline bool hasNextShortcutTarget() const { return mHasNextShortcutTarget; } // Gets the shortcut target itself as a uint16_t string. For parameters and return value // see BinaryFormat::getWordAtAddress. // TODO: make the output an uint32_t* to handle the whole unicode range. inline int getNextShortcutTarget(const int maxDepth, uint16_t *outWord, int *outFreq) { const int shortcutFlags = BinaryFormat::getFlagsAndForwardPointer(mDict, &mPos); mHasNextShortcutTarget = 0 != (shortcutFlags & BinaryFormat::FLAG_ATTRIBUTE_HAS_NEXT); unsigned int i; for (i = 0; i < MAX_WORD_LENGTH_INTERNAL; ++i) { const int codePoint = BinaryFormat::getCodePointAndForwardPointer(mDict, &mPos); if (NOT_A_CODE_POINT == codePoint) break; outWord[i] = (uint16_t)codePoint; } *outFreq = BinaryFormat::getAttributeFrequencyFromFlags(shortcutFlags); return i; } }; TerminalAttributes(const uint8_t *const dict, const uint8_t flags, const int pos) : mDict(dict), mFlags(flags), mStartPos(pos) { } inline ShortcutIterator getShortcutIterator() const { // The size of the shortcuts is stored here so that the whole shortcut chunk can be // skipped quickly, so we ignore it. return ShortcutIterator(mDict, mStartPos + BinaryFormat::SHORTCUT_LIST_SIZE_SIZE, mFlags); } bool isBlacklistedOrNotAWord() const { return mFlags & (BinaryFormat::FLAG_IS_BLACKLISTED | BinaryFormat::FLAG_IS_NOT_A_WORD); } private: DISALLOW_IMPLICIT_CONSTRUCTORS(TerminalAttributes); const uint8_t *const mDict; const uint8_t mFlags; const int mStartPos; }; } // namespace latinime #endif // LATINIME_TERMINAL_ATTRIBUTES_H