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/*
* Copyright (C) 2015 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.
*/
/**
* An implementation of Liang's hyphenation algorithm.
*/
#include <memory>
#include <unordered_map>
#ifndef MINIKIN_HYPHENATOR_H
#define MINIKIN_HYPHENATOR_H
namespace android {
class Trie {
public:
std::vector<uint8_t> result;
std::unordered_map<uint16_t, Trie> succ;
};
class Hyphenator {
public:
// Note: this will also require a locale, for proper case folding behavior
static Hyphenator* load(const uint16_t* patternData, size_t size);
// Compute the hyphenation of a word, storing the hyphenation in result vector. Each
// entry in the vector is a "hyphen edit" to be applied at the corresponding code unit
// offset in the word. Currently 0 means no hyphen and 1 means insert hyphen and break,
// but this will be expanded to other edits for nonstandard hyphenation.
// Example: word is "hyphen", result is [0 0 1 0 0 0], corresponding to "hy-phen".
void hyphenate(std::vector<uint8_t>* result, const uint16_t* word, size_t len);
private:
void addPattern(const uint16_t* pattern, size_t size);
void hyphenateSoft(std::vector<uint8_t>* result, const uint16_t* word, size_t len);
// TODO: these should become parameters, as they might vary by locale, screen size, and
// possibly explicit user control.
static const int MIN_PREFIX = 2;
static const int MIN_SUFFIX = 3;
Trie root;
};
} // namespace android
#endif // MINIKIN_HYPHENATOR_H
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