/*
 * Copyright (C) 2009 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.
 */

package com.android.inputmethod.latin;

import android.content.Context;

import com.android.inputmethod.keyboard.Keyboard;
import com.android.inputmethod.keyboard.ProximityInfo;

import java.util.LinkedList;

/**
 * Base class for an in-memory dictionary that can grow dynamically and can
 * be searched for suggestions and valid words.
 */
public class ExpandableDictionary extends Dictionary {
    /**
     * There is difference between what java and native code can handle.
     * It uses 32 because Java stack overflows when greater value is used.
     */
    protected static final int MAX_WORD_LENGTH = 32;

    // Bigram frequency is a fixed point number with 1 meaning 1.2 and 255 meaning 1.8.
    protected static final int BIGRAM_MAX_FREQUENCY = 255;

    private Context mContext;
    private char[] mWordBuilder = new char[MAX_WORD_LENGTH];
    private int mDicTypeId;
    private int mMaxDepth;
    private int mInputLength;

    private boolean mRequiresReload;

    private boolean mUpdatingDictionary;

    // Use this lock before touching mUpdatingDictionary & mRequiresDownload
    private Object mUpdatingLock = new Object();

    private static class Node {
        Node() {}
        char mCode;
        int mFrequency;
        boolean mTerminal;
        Node mParent;
        NodeArray mChildren;
        LinkedList<NextWord> mNGrams; // Supports ngram
    }

    private static class NodeArray {
        Node[] mData;
        int mLength = 0;
        private static final int INCREMENT = 2;

        NodeArray() {
            mData = new Node[INCREMENT];
        }

        void add(Node n) {
            if (mLength + 1 > mData.length) {
                Node[] tempData = new Node[mLength + INCREMENT];
                if (mLength > 0) {
                    System.arraycopy(mData, 0, tempData, 0, mLength);
                }
                mData = tempData;
            }
            mData[mLength++] = n;
        }
    }

    private static class NextWord {
        public final Node mWord;
        private int mFrequency;

        public NextWord(Node word, int frequency) {
            mWord = word;
            mFrequency = frequency;
        }

        public int getFrequency() {
            return mFrequency;
        }

        public int setFrequency(int freq) {
            mFrequency = freq;
            return mFrequency;
        }

        public int addFrequency(int add) {
            mFrequency += add;
            if (mFrequency > BIGRAM_MAX_FREQUENCY) mFrequency = BIGRAM_MAX_FREQUENCY;
            return mFrequency;
        }
    }

    private NodeArray mRoots;

    private int[][] mCodes;

    public ExpandableDictionary(Context context, int dicTypeId) {
        mContext = context;
        clearDictionary();
        mCodes = new int[MAX_WORD_LENGTH][];
        mDicTypeId = dicTypeId;
    }

    public void loadDictionary() {
        synchronized (mUpdatingLock) {
            startDictionaryLoadingTaskLocked();
        }
    }

    public void startDictionaryLoadingTaskLocked() {
        if (!mUpdatingDictionary) {
            mUpdatingDictionary = true;
            mRequiresReload = false;
            new LoadDictionaryTask().start();
        }
    }

    public void setRequiresReload(boolean reload) {
        synchronized (mUpdatingLock) {
            mRequiresReload = reload;
        }
    }

    public boolean getRequiresReload() {
        return mRequiresReload;
    }

    /** Override to load your dictionary here, on a background thread. */
    public void loadDictionaryAsync() {
        // empty base implementation
    }

    public Context getContext() {
        return mContext;
    }

    public int getMaxWordLength() {
        return MAX_WORD_LENGTH;
    }

    public void addWord(String word, int frequency) {
        addWordRec(mRoots, word, 0, frequency, null);
    }

    private void addWordRec(NodeArray children, final String word, final int depth,
            final int frequency, Node parentNode) {
        final int wordLength = word.length();
        if (wordLength <= depth) return;
        final char c = word.charAt(depth);
        // Does children have the current character?
        final int childrenLength = children.mLength;
        Node childNode = null;
        for (int i = 0; i < childrenLength; i++) {
            final Node node = children.mData[i];
            if (node.mCode == c) {
                childNode = node;
                break;
            }
        }
        if (childNode == null) {
            childNode = new Node();
            childNode.mCode = c;
            childNode.mParent = parentNode;
            children.add(childNode);
        }
        if (wordLength == depth + 1) {
            // Terminate this word
            childNode.mTerminal = true;
            childNode.mFrequency = Math.max(frequency, childNode.mFrequency);
            if (childNode.mFrequency > 255) childNode.mFrequency = 255;
            return;
        }
        if (childNode.mChildren == null) {
            childNode.mChildren = new NodeArray();
        }
        addWordRec(childNode.mChildren, word, depth + 1, frequency, childNode);
    }

    @Override
    public void getWords(final WordComposer codes, final WordCallback callback,
            final ProximityInfo proximityInfo) {
        synchronized (mUpdatingLock) {
            // If we need to update, start off a background task
            if (mRequiresReload) startDictionaryLoadingTaskLocked();
            // Currently updating contacts, don't return any results.
            if (mUpdatingDictionary) return;
        }
        getWordsInner(codes, callback, proximityInfo);
    }

    protected final void getWordsInner(final WordComposer codes, final WordCallback callback,
            @SuppressWarnings("unused") final ProximityInfo proximityInfo) {
        mInputLength = codes.size();
        if (mCodes.length < mInputLength) mCodes = new int[mInputLength][];
        // Cache the codes so that we don't have to lookup an array list
        for (int i = 0; i < mInputLength; i++) {
            mCodes[i] = codes.getCodesAt(i);
        }
        mMaxDepth = mInputLength * 3;
        getWordsRec(mRoots, codes, mWordBuilder, 0, false, 1, 0, -1, callback);
        for (int i = 0; i < mInputLength; i++) {
            getWordsRec(mRoots, codes, mWordBuilder, 0, false, 1, 0, i, callback);
        }
    }

    @Override
    public synchronized boolean isValidWord(CharSequence word) {
        synchronized (mUpdatingLock) {
            // If we need to update, start off a background task
            if (mRequiresReload) startDictionaryLoadingTaskLocked();
            if (mUpdatingDictionary) return false;
        }
        return getWordFrequency(word) > -1;
    }

    /**
     * Returns the word's frequency or -1 if not found
     */
    protected int getWordFrequency(CharSequence word) {
        // Case-sensitive search
        Node node = searchNode(mRoots, word, 0, word.length());
        return (node == null) ? -1 : node.mFrequency;
    }

    private static int computeSkippedWordFinalFreq(int freq, int snr, int inputLength) {
        // The computation itself makes sense for >= 2, but the == 2 case returns 0
        // anyway so we may as well test against 3 instead and return the constant
        if (inputLength >= 3) {
            return (freq * snr * (inputLength - 2)) / (inputLength - 1);
        } else {
            return 0;
        }
    }

    /**
     * Recursively traverse the tree for words that match the input. Input consists of
     * a list of arrays. Each item in the list is one input character position. An input
     * character is actually an array of multiple possible candidates. This function is not
     * optimized for speed, assuming that the user dictionary will only be a few hundred words in
     * size.
     * @param roots node whose children have to be search for matches
     * @param codes the input character codes
     * @param word the word being composed as a possible match
     * @param depth the depth of traversal - the length of the word being composed thus far
     * @param completion whether the traversal is now in completion mode - meaning that we've
     * exhausted the input and we're looking for all possible suffixes.
     * @param snr current weight of the word being formed
     * @param inputIndex position in the input characters. This can be off from the depth in
     * case we skip over some punctuations such as apostrophe in the traversal. That is, if you type
     * "wouldve", it could be matching "would've", so the depth will be one more than the
     * inputIndex
     * @param callback the callback class for adding a word
     */
    // TODO: Share this routine with the native code for BinaryDictionary
    protected void getWordsRec(NodeArray roots, final WordComposer codes, final char[] word,
            final int depth, final boolean completion, int snr, int inputIndex, int skipPos,
            WordCallback callback) {
        final int count = roots.mLength;
        final int codeSize = mInputLength;
        // Optimization: Prune out words that are too long compared to how much was typed.
        if (depth > mMaxDepth) {
            return;
        }
        final int[] currentChars;
        if (codeSize <= inputIndex) {
            currentChars = null;
        } else {
            currentChars = mCodes[inputIndex];
        }

        for (int i = 0; i < count; i++) {
            final Node node = roots.mData[i];
            final char c = node.mCode;
            final char lowerC = toLowerCase(c);
            final boolean terminal = node.mTerminal;
            final NodeArray children = node.mChildren;
            final int freq = node.mFrequency;
            if (completion || currentChars == null) {
                word[depth] = c;
                if (terminal) {
                    final int finalFreq;
                    if (skipPos < 0) {
                        finalFreq = freq * snr;
                    } else {
                        finalFreq = computeSkippedWordFinalFreq(freq, snr, mInputLength);
                    }
                    if (!callback.addWord(word, 0, depth + 1, finalFreq, mDicTypeId,
                            DataType.UNIGRAM)) {
                        return;
                    }
                }
                if (children != null) {
                    getWordsRec(children, codes, word, depth + 1, true, snr, inputIndex,
                            skipPos, callback);
                }
            } else if ((c == Keyboard.CODE_SINGLE_QUOTE
                    && currentChars[0] != Keyboard.CODE_SINGLE_QUOTE) || depth == skipPos) {
                // Skip the ' and continue deeper
                word[depth] = c;
                if (children != null) {
                    getWordsRec(children, codes, word, depth + 1, completion, snr, inputIndex,
                            skipPos, callback);
                }
            } else {
                // Don't use alternatives if we're looking for missing characters
                final int alternativesSize = skipPos >= 0? 1 : currentChars.length;
                for (int j = 0; j < alternativesSize; j++) {
                    final int addedAttenuation = (j > 0 ? 1 : 2);
                    final int currentChar = currentChars[j];
                    if (currentChar == -1) {
                        break;
                    }
                    if (currentChar == lowerC || currentChar == c) {
                        word[depth] = c;

                        if (codeSize == inputIndex + 1) {
                            if (terminal) {
                                if (INCLUDE_TYPED_WORD_IF_VALID
                                        || !same(word, depth + 1, codes.getTypedWord())) {
                                    final int finalFreq;
                                    if (skipPos < 0) {
                                        finalFreq = freq * snr * addedAttenuation
                                                * FULL_WORD_SCORE_MULTIPLIER;
                                    } else {
                                        finalFreq = computeSkippedWordFinalFreq(freq,
                                                snr * addedAttenuation, mInputLength);
                                    }
                                    callback.addWord(word, 0, depth + 1, finalFreq, mDicTypeId,
                                            DataType.UNIGRAM);
                                }
                            }
                            if (children != null) {
                                getWordsRec(children, codes, word, depth + 1,
                                        true, snr * addedAttenuation, inputIndex + 1,
                                        skipPos, callback);
                            }
                        } else if (children != null) {
                            getWordsRec(children, codes, word, depth + 1,
                                    false, snr * addedAttenuation, inputIndex + 1,
                                    skipPos, callback);
                        }
                    }
                }
            }
        }
    }

    protected int setBigram(String word1, String word2, int frequency) {
        return addOrSetBigram(word1, word2, frequency, false);
    }

    protected int addBigram(String word1, String word2, int frequency) {
        return addOrSetBigram(word1, word2, frequency, true);
    }

    /**
     * Adds bigrams to the in-memory trie structure that is being used to retrieve any word
     * @param frequency frequency for this bigram
     * @param addFrequency if true, it adds to current frequency, else it overwrites the old value
     * @return returns the final frequency
     */
    private int addOrSetBigram(String word1, String word2, int frequency, boolean addFrequency) {
        // We don't want results to be different according to case of the looked up left hand side
        // word. We do want however to return the correct case for the right hand side.
        // So we want to squash the case of the left hand side, and preserve that of the right
        // hand side word.
        Node firstWord = searchWord(mRoots, word1.toLowerCase(), 0, null);
        Node secondWord = searchWord(mRoots, word2, 0, null);
        LinkedList<NextWord> bigram = firstWord.mNGrams;
        if (bigram == null || bigram.size() == 0) {
            firstWord.mNGrams = new LinkedList<NextWord>();
            bigram = firstWord.mNGrams;
        } else {
            for (NextWord nw : bigram) {
                if (nw.mWord == secondWord) {
                    if (addFrequency) {
                        return nw.addFrequency(frequency);
                    } else {
                        return nw.setFrequency(frequency);
                    }
                }
            }
        }
        firstWord.mNGrams.add(new NextWord(secondWord, frequency));
        return frequency;
    }

    /**
     * Searches for the word and add the word if it does not exist.
     * @return Returns the terminal node of the word we are searching for.
     */
    private Node searchWord(NodeArray children, String word, int depth, Node parentNode) {
        final int wordLength = word.length();
        final char c = word.charAt(depth);
        // Does children have the current character?
        final int childrenLength = children.mLength;
        Node childNode = null;
        for (int i = 0; i < childrenLength; i++) {
            final Node node = children.mData[i];
            if (node.mCode == c) {
                childNode = node;
                break;
            }
        }
        if (childNode == null) {
            childNode = new Node();
            childNode.mCode = c;
            childNode.mParent = parentNode;
            children.add(childNode);
        }
        if (wordLength == depth + 1) {
            // Terminate this word
            childNode.mTerminal = true;
            return childNode;
        }
        if (childNode.mChildren == null) {
            childNode.mChildren = new NodeArray();
        }
        return searchWord(childNode.mChildren, word, depth + 1, childNode);
    }

    // @VisibleForTesting
    boolean reloadDictionaryIfRequired() {
        synchronized (mUpdatingLock) {
            // If we need to update, start off a background task
            if (mRequiresReload) startDictionaryLoadingTaskLocked();
            // Currently updating contacts, don't return any results.
            return mUpdatingDictionary;
        }
    }

    private void runBigramReverseLookUp(final CharSequence previousWord,
            final WordCallback callback) {
        // Search for the lowercase version of the word only, because that's where bigrams
        // store their sons.
        Node prevWord = searchNode(mRoots, previousWord.toString().toLowerCase(), 0,
                previousWord.length());
        if (prevWord != null && prevWord.mNGrams != null) {
            reverseLookUp(prevWord.mNGrams, callback);
        }
    }

    @Override
    public void getBigrams(final WordComposer codes, final CharSequence previousWord,
            final WordCallback callback) {
        if (!reloadDictionaryIfRequired()) {
            runBigramReverseLookUp(previousWord, callback);
        }
    }

    /**
     * Used for testing purposes and in the spell checker
     * This function will wait for loading from database to be done
     */
    void waitForDictionaryLoading() {
        while (mUpdatingDictionary) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                //
            }
        }
    }

    protected final void blockingReloadDictionaryIfRequired() {
        reloadDictionaryIfRequired();
        waitForDictionaryLoading();
    }

    // Local to reverseLookUp, but do not allocate each time.
    private final char[] mLookedUpString = new char[MAX_WORD_LENGTH];

    /**
     * reverseLookUp retrieves the full word given a list of terminal nodes and adds those words
     * through callback.
     * @param terminalNodes list of terminal nodes we want to add
     */
    private void reverseLookUp(LinkedList<NextWord> terminalNodes,
            final WordCallback callback) {
        Node node;
        int freq;
        for (NextWord nextWord : terminalNodes) {
            node = nextWord.mWord;
            freq = nextWord.getFrequency();
            int index = MAX_WORD_LENGTH;
            do {
                --index;
                mLookedUpString[index] = node.mCode;
                node = node.mParent;
            } while (node != null);

            callback.addWord(mLookedUpString, index, MAX_WORD_LENGTH - index, freq, mDicTypeId,
                    DataType.BIGRAM);
        }
    }

    /**
     * Recursively search for the terminal node of the word.
     *
     * One iteration takes the full word to search for and the current index of the recursion.
     *
     * @param children the node of the trie to search under.
     * @param word the word to search for. Only read [offset..length] so there may be trailing chars
     * @param offset the index in {@code word} this recursion should operate on.
     * @param length the length of the input word.
     * @return Returns the terminal node of the word if the word exists
     */
    private Node searchNode(final NodeArray children, final CharSequence word, final int offset,
            final int length) {
        final int count = children.mLength;
        final char currentChar = word.charAt(offset);
        for (int j = 0; j < count; j++) {
            final Node node = children.mData[j];
            if (node.mCode == currentChar) {
                if (offset == length - 1) {
                    if (node.mTerminal) {
                        return node;
                    }
                } else {
                    if (node.mChildren != null) {
                        Node returnNode = searchNode(node.mChildren, word, offset + 1, length);
                        if (returnNode != null) return returnNode;
                    }
                }
            }
        }
        return null;
    }

    protected void clearDictionary() {
        mRoots = new NodeArray();
    }

    private class LoadDictionaryTask extends Thread {
        LoadDictionaryTask() {}
        @Override
        public void run() {
            loadDictionaryAsync();
            synchronized (mUpdatingLock) {
                mUpdatingDictionary = false;
            }
        }
    }

    private static char toLowerCase(char c) {
        char baseChar = c;
        if (c < BASE_CHARS.length) {
            baseChar = BASE_CHARS[c];
        }
        if (baseChar >= 'A' && baseChar <= 'Z') {
            return (char)(baseChar | 32);
        } else if (baseChar > 127) {
            return Character.toLowerCase(baseChar);
        }
        return baseChar;
    }

    /**
     * Table mapping most combined Latin, Greek, and Cyrillic characters
     * to their base characters.  If c is in range, BASE_CHARS[c] == c
     * if c is not a combined character, or the base character if it
     * is combined.
     */
    private static final char BASE_CHARS[] = {
        0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 
        0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f, 
        0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 
        0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f, 
        0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 
        0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f, 
        0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 
        0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f, 
        0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 
        0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f, 
        0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 
        0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f, 
        0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 
        0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f, 
        0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 
        0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f, 
        0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087, 
        0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f, 
        0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097, 
        0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f, 
        0x0020, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7, 
        0x0020, 0x00a9, 0x0061, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x0020, 
        0x00b0, 0x00b1, 0x0032, 0x0033, 0x0020, 0x03bc, 0x00b6, 0x00b7, 
        0x0020, 0x0031, 0x006f, 0x00bb, 0x0031, 0x0031, 0x0033, 0x00bf, 
        0x0041, 0x0041, 0x0041, 0x0041, 0x0041, 0x0041, 0x00c6, 0x0043, 
        0x0045, 0x0045, 0x0045, 0x0045, 0x0049, 0x0049, 0x0049, 0x0049, 
        0x00d0, 0x004e, 0x004f, 0x004f, 0x004f, 0x004f, 0x004f, 0x00d7, 
        0x004f, 0x0055, 0x0055, 0x0055, 0x0055, 0x0059, 0x00de, 0x0073, // Manually changed d8 to 4f
                                                                        // Manually changed df to 73
        0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x0061, 0x00e6, 0x0063, 
        0x0065, 0x0065, 0x0065, 0x0065, 0x0069, 0x0069, 0x0069, 0x0069, 
        0x00f0, 0x006e, 0x006f, 0x006f, 0x006f, 0x006f, 0x006f, 0x00f7, 
        0x006f, 0x0075, 0x0075, 0x0075, 0x0075, 0x0079, 0x00fe, 0x0079, // Manually changed f8 to 6f
        0x0041, 0x0061, 0x0041, 0x0061, 0x0041, 0x0061, 0x0043, 0x0063, 
        0x0043, 0x0063, 0x0043, 0x0063, 0x0043, 0x0063, 0x0044, 0x0064, 
        0x0110, 0x0111, 0x0045, 0x0065, 0x0045, 0x0065, 0x0045, 0x0065, 
        0x0045, 0x0065, 0x0045, 0x0065, 0x0047, 0x0067, 0x0047, 0x0067, 
        0x0047, 0x0067, 0x0047, 0x0067, 0x0048, 0x0068, 0x0126, 0x0127, 
        0x0049, 0x0069, 0x0049, 0x0069, 0x0049, 0x0069, 0x0049, 0x0069, 
        0x0049, 0x0131, 0x0049, 0x0069, 0x004a, 0x006a, 0x004b, 0x006b, 
        0x0138, 0x004c, 0x006c, 0x004c, 0x006c, 0x004c, 0x006c, 0x004c, 
        0x006c, 0x0141, 0x0142, 0x004e, 0x006e, 0x004e, 0x006e, 0x004e, 
        0x006e, 0x02bc, 0x014a, 0x014b, 0x004f, 0x006f, 0x004f, 0x006f, 
        0x004f, 0x006f, 0x0152, 0x0153, 0x0052, 0x0072, 0x0052, 0x0072, 
        0x0052, 0x0072, 0x0053, 0x0073, 0x0053, 0x0073, 0x0053, 0x0073, 
        0x0053, 0x0073, 0x0054, 0x0074, 0x0054, 0x0074, 0x0166, 0x0167, 
        0x0055, 0x0075, 0x0055, 0x0075, 0x0055, 0x0075, 0x0055, 0x0075, 
        0x0055, 0x0075, 0x0055, 0x0075, 0x0057, 0x0077, 0x0059, 0x0079, 
        0x0059, 0x005a, 0x007a, 0x005a, 0x007a, 0x005a, 0x007a, 0x0073, 
        0x0180, 0x0181, 0x0182, 0x0183, 0x0184, 0x0185, 0x0186, 0x0187, 
        0x0188, 0x0189, 0x018a, 0x018b, 0x018c, 0x018d, 0x018e, 0x018f, 
        0x0190, 0x0191, 0x0192, 0x0193, 0x0194, 0x0195, 0x0196, 0x0197, 
        0x0198, 0x0199, 0x019a, 0x019b, 0x019c, 0x019d, 0x019e, 0x019f, 
        0x004f, 0x006f, 0x01a2, 0x01a3, 0x01a4, 0x01a5, 0x01a6, 0x01a7, 
        0x01a8, 0x01a9, 0x01aa, 0x01ab, 0x01ac, 0x01ad, 0x01ae, 0x0055, 
        0x0075, 0x01b1, 0x01b2, 0x01b3, 0x01b4, 0x01b5, 0x01b6, 0x01b7, 
        0x01b8, 0x01b9, 0x01ba, 0x01bb, 0x01bc, 0x01bd, 0x01be, 0x01bf, 
        0x01c0, 0x01c1, 0x01c2, 0x01c3, 0x0044, 0x0044, 0x0064, 0x004c, 
        0x004c, 0x006c, 0x004e, 0x004e, 0x006e, 0x0041, 0x0061, 0x0049, 
        0x0069, 0x004f, 0x006f, 0x0055, 0x0075, 0x00dc, 0x00fc, 0x00dc, 
        0x00fc, 0x00dc, 0x00fc, 0x00dc, 0x00fc, 0x01dd, 0x00c4, 0x00e4, 
        0x0226, 0x0227, 0x00c6, 0x00e6, 0x01e4, 0x01e5, 0x0047, 0x0067, 
        0x004b, 0x006b, 0x004f, 0x006f, 0x01ea, 0x01eb, 0x01b7, 0x0292, 
        0x006a, 0x0044, 0x0044, 0x0064, 0x0047, 0x0067, 0x01f6, 0x01f7, 
        0x004e, 0x006e, 0x00c5, 0x00e5, 0x00c6, 0x00e6, 0x00d8, 0x00f8, 
        0x0041, 0x0061, 0x0041, 0x0061, 0x0045, 0x0065, 0x0045, 0x0065, 
        0x0049, 0x0069, 0x0049, 0x0069, 0x004f, 0x006f, 0x004f, 0x006f, 
        0x0052, 0x0072, 0x0052, 0x0072, 0x0055, 0x0075, 0x0055, 0x0075, 
        0x0053, 0x0073, 0x0054, 0x0074, 0x021c, 0x021d, 0x0048, 0x0068, 
        0x0220, 0x0221, 0x0222, 0x0223, 0x0224, 0x0225, 0x0041, 0x0061, 
        0x0045, 0x0065, 0x00d6, 0x00f6, 0x00d5, 0x00f5, 0x004f, 0x006f, 
        0x022e, 0x022f, 0x0059, 0x0079, 0x0234, 0x0235, 0x0236, 0x0237, 
        0x0238, 0x0239, 0x023a, 0x023b, 0x023c, 0x023d, 0x023e, 0x023f, 
        0x0240, 0x0241, 0x0242, 0x0243, 0x0244, 0x0245, 0x0246, 0x0247, 
        0x0248, 0x0249, 0x024a, 0x024b, 0x024c, 0x024d, 0x024e, 0x024f, 
        0x0250, 0x0251, 0x0252, 0x0253, 0x0254, 0x0255, 0x0256, 0x0257, 
        0x0258, 0x0259, 0x025a, 0x025b, 0x025c, 0x025d, 0x025e, 0x025f, 
        0x0260, 0x0261, 0x0262, 0x0263, 0x0264, 0x0265, 0x0266, 0x0267, 
        0x0268, 0x0269, 0x026a, 0x026b, 0x026c, 0x026d, 0x026e, 0x026f, 
        0x0270, 0x0271, 0x0272, 0x0273, 0x0274, 0x0275, 0x0276, 0x0277, 
        0x0278, 0x0279, 0x027a, 0x027b, 0x027c, 0x027d, 0x027e, 0x027f, 
        0x0280, 0x0281, 0x0282, 0x0283, 0x0284, 0x0285, 0x0286, 0x0287, 
        0x0288, 0x0289, 0x028a, 0x028b, 0x028c, 0x028d, 0x028e, 0x028f, 
        0x0290, 0x0291, 0x0292, 0x0293, 0x0294, 0x0295, 0x0296, 0x0297, 
        0x0298, 0x0299, 0x029a, 0x029b, 0x029c, 0x029d, 0x029e, 0x029f, 
        0x02a0, 0x02a1, 0x02a2, 0x02a3, 0x02a4, 0x02a5, 0x02a6, 0x02a7, 
        0x02a8, 0x02a9, 0x02aa, 0x02ab, 0x02ac, 0x02ad, 0x02ae, 0x02af, 
        0x0068, 0x0266, 0x006a, 0x0072, 0x0279, 0x027b, 0x0281, 0x0077, 
        0x0079, 0x02b9, 0x02ba, 0x02bb, 0x02bc, 0x02bd, 0x02be, 0x02bf, 
        0x02c0, 0x02c1, 0x02c2, 0x02c3, 0x02c4, 0x02c5, 0x02c6, 0x02c7, 
        0x02c8, 0x02c9, 0x02ca, 0x02cb, 0x02cc, 0x02cd, 0x02ce, 0x02cf, 
        0x02d0, 0x02d1, 0x02d2, 0x02d3, 0x02d4, 0x02d5, 0x02d6, 0x02d7, 
        0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x0020, 0x02de, 0x02df, 
        0x0263, 0x006c, 0x0073, 0x0078, 0x0295, 0x02e5, 0x02e6, 0x02e7, 
        0x02e8, 0x02e9, 0x02ea, 0x02eb, 0x02ec, 0x02ed, 0x02ee, 0x02ef, 
        0x02f0, 0x02f1, 0x02f2, 0x02f3, 0x02f4, 0x02f5, 0x02f6, 0x02f7, 
        0x02f8, 0x02f9, 0x02fa, 0x02fb, 0x02fc, 0x02fd, 0x02fe, 0x02ff, 
        0x0300, 0x0301, 0x0302, 0x0303, 0x0304, 0x0305, 0x0306, 0x0307, 
        0x0308, 0x0309, 0x030a, 0x030b, 0x030c, 0x030d, 0x030e, 0x030f, 
        0x0310, 0x0311, 0x0312, 0x0313, 0x0314, 0x0315, 0x0316, 0x0317, 
        0x0318, 0x0319, 0x031a, 0x031b, 0x031c, 0x031d, 0x031e, 0x031f, 
        0x0320, 0x0321, 0x0322, 0x0323, 0x0324, 0x0325, 0x0326, 0x0327, 
        0x0328, 0x0329, 0x032a, 0x032b, 0x032c, 0x032d, 0x032e, 0x032f, 
        0x0330, 0x0331, 0x0332, 0x0333, 0x0334, 0x0335, 0x0336, 0x0337, 
        0x0338, 0x0339, 0x033a, 0x033b, 0x033c, 0x033d, 0x033e, 0x033f, 
        0x0300, 0x0301, 0x0342, 0x0313, 0x0308, 0x0345, 0x0346, 0x0347, 
        0x0348, 0x0349, 0x034a, 0x034b, 0x034c, 0x034d, 0x034e, 0x034f, 
        0x0350, 0x0351, 0x0352, 0x0353, 0x0354, 0x0355, 0x0356, 0x0357, 
        0x0358, 0x0359, 0x035a, 0x035b, 0x035c, 0x035d, 0x035e, 0x035f, 
        0x0360, 0x0361, 0x0362, 0x0363, 0x0364, 0x0365, 0x0366, 0x0367, 
        0x0368, 0x0369, 0x036a, 0x036b, 0x036c, 0x036d, 0x036e, 0x036f, 
        0x0370, 0x0371, 0x0372, 0x0373, 0x02b9, 0x0375, 0x0376, 0x0377, 
        0x0378, 0x0379, 0x0020, 0x037b, 0x037c, 0x037d, 0x003b, 0x037f, 
        0x0380, 0x0381, 0x0382, 0x0383, 0x0020, 0x00a8, 0x0391, 0x00b7, 
        0x0395, 0x0397, 0x0399, 0x038b, 0x039f, 0x038d, 0x03a5, 0x03a9, 
        0x03ca, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396, 0x0397, 
        0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e, 0x039f, 
        0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7, 
        0x03a8, 0x03a9, 0x0399, 0x03a5, 0x03b1, 0x03b5, 0x03b7, 0x03b9, 
        0x03cb, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7, 
        0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf, 
        0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6, 0x03c7, 
        0x03c8, 0x03c9, 0x03b9, 0x03c5, 0x03bf, 0x03c5, 0x03c9, 0x03cf, 
        0x03b2, 0x03b8, 0x03a5, 0x03d2, 0x03d2, 0x03c6, 0x03c0, 0x03d7, 
        0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df, 
        0x03e0, 0x03e1, 0x03e2, 0x03e3, 0x03e4, 0x03e5, 0x03e6, 0x03e7, 
        0x03e8, 0x03e9, 0x03ea, 0x03eb, 0x03ec, 0x03ed, 0x03ee, 0x03ef, 
        0x03ba, 0x03c1, 0x03c2, 0x03f3, 0x0398, 0x03b5, 0x03f6, 0x03f7, 
        0x03f8, 0x03a3, 0x03fa, 0x03fb, 0x03fc, 0x03fd, 0x03fe, 0x03ff, 
        0x0415, 0x0415, 0x0402, 0x0413, 0x0404, 0x0405, 0x0406, 0x0406, 
        0x0408, 0x0409, 0x040a, 0x040b, 0x041a, 0x0418, 0x0423, 0x040f, 
        0x0410, 0x0411, 0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417, 
        0x0418, 0x0418, 0x041a, 0x041b, 0x041c, 0x041d, 0x041e, 0x041f, 
        0x0420, 0x0421, 0x0422, 0x0423, 0x0424, 0x0425, 0x0426, 0x0427, 
        0x0428, 0x0429, 0x042a, 0x042b, 0x042c, 0x042d, 0x042e, 0x042f, 
        0x0430, 0x0431, 0x0432, 0x0433, 0x0434, 0x0435, 0x0436, 0x0437, 
        0x0438, 0x0438, 0x043a, 0x043b, 0x043c, 0x043d, 0x043e, 0x043f, 
        0x0440, 0x0441, 0x0442, 0x0443, 0x0444, 0x0445, 0x0446, 0x0447, 
        0x0448, 0x0449, 0x044a, 0x044b, 0x044c, 0x044d, 0x044e, 0x044f, 
        0x0435, 0x0435, 0x0452, 0x0433, 0x0454, 0x0455, 0x0456, 0x0456, 
        0x0458, 0x0459, 0x045a, 0x045b, 0x043a, 0x0438, 0x0443, 0x045f, 
        0x0460, 0x0461, 0x0462, 0x0463, 0x0464, 0x0465, 0x0466, 0x0467, 
        0x0468, 0x0469, 0x046a, 0x046b, 0x046c, 0x046d, 0x046e, 0x046f, 
        0x0470, 0x0471, 0x0472, 0x0473, 0x0474, 0x0475, 0x0474, 0x0475, 
        0x0478, 0x0479, 0x047a, 0x047b, 0x047c, 0x047d, 0x047e, 0x047f, 
        0x0480, 0x0481, 0x0482, 0x0483, 0x0484, 0x0485, 0x0486, 0x0487, 
        0x0488, 0x0489, 0x048a, 0x048b, 0x048c, 0x048d, 0x048e, 0x048f, 
        0x0490, 0x0491, 0x0492, 0x0493, 0x0494, 0x0495, 0x0496, 0x0497, 
        0x0498, 0x0499, 0x049a, 0x049b, 0x049c, 0x049d, 0x049e, 0x049f, 
        0x04a0, 0x04a1, 0x04a2, 0x04a3, 0x04a4, 0x04a5, 0x04a6, 0x04a7, 
        0x04a8, 0x04a9, 0x04aa, 0x04ab, 0x04ac, 0x04ad, 0x04ae, 0x04af, 
        0x04b0, 0x04b1, 0x04b2, 0x04b3, 0x04b4, 0x04b5, 0x04b6, 0x04b7, 
        0x04b8, 0x04b9, 0x04ba, 0x04bb, 0x04bc, 0x04bd, 0x04be, 0x04bf, 
        0x04c0, 0x0416, 0x0436, 0x04c3, 0x04c4, 0x04c5, 0x04c6, 0x04c7, 
        0x04c8, 0x04c9, 0x04ca, 0x04cb, 0x04cc, 0x04cd, 0x04ce, 0x04cf, 
        0x0410, 0x0430, 0x0410, 0x0430, 0x04d4, 0x04d5, 0x0415, 0x0435, 
        0x04d8, 0x04d9, 0x04d8, 0x04d9, 0x0416, 0x0436, 0x0417, 0x0437, 
        0x04e0, 0x04e1, 0x0418, 0x0438, 0x0418, 0x0438, 0x041e, 0x043e, 
        0x04e8, 0x04e9, 0x04e8, 0x04e9, 0x042d, 0x044d, 0x0423, 0x0443, 
        0x0423, 0x0443, 0x0423, 0x0443, 0x0427, 0x0447, 0x04f6, 0x04f7, 
        0x042b, 0x044b, 0x04fa, 0x04fb, 0x04fc, 0x04fd, 0x04fe, 0x04ff, 
    };

    // generated with:
    // cat UnicodeData.txt | perl -e 'while (<>) { @foo = split(/;/); $foo[5] =~ s/<.*> //; $base[hex($foo[0])] = hex($foo[5]);} for ($i = 0; $i < 0x500; $i += 8) { for ($j = $i; $j < $i + 8; $j++) { printf("0x%04x, ", $base[$j] ? $base[$j] : $j)}; print "\n"; }'

}