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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.lucene.analysis.hunspell;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.lucene.codecs.CodecUtil;
import org.apache.lucene.store.ByteArrayDataOutput;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.util.ArrayUtil;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.BytesRefBuilder;
import org.apache.lucene.util.BytesRefHash;
import org.apache.lucene.util.CharsRef;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.IntsRef;
import org.apache.lucene.util.IntsRefBuilder;
import org.apache.lucene.util.OfflineSorter.ByteSequencesReader;
import org.apache.lucene.util.OfflineSorter.ByteSequencesWriter;
import org.apache.lucene.util.OfflineSorter;
import org.apache.lucene.util.automaton.CharacterRunAutomaton;
import org.apache.lucene.util.automaton.RegExp;
import org.apache.lucene.util.fst.Builder;
import org.apache.lucene.util.fst.CharSequenceOutputs;
import org.apache.lucene.util.fst.FST;
import org.apache.lucene.util.fst.IntSequenceOutputs;
import org.apache.lucene.util.fst.Outputs;
import org.apache.lucene.util.fst.Util;
/**
* In-memory structure for the dictionary (.dic) and affix (.aff)
* data of a hunspell dictionary.
*/
public class Dictionary {
static final char[] NOFLAGS = new char[0];
private static final String ALIAS_KEY = "AF";
private static final String MORPH_ALIAS_KEY = "AM";
private static final String PREFIX_KEY = "PFX";
private static final String SUFFIX_KEY = "SFX";
private static final String FLAG_KEY = "FLAG";
private static final String COMPLEXPREFIXES_KEY = "COMPLEXPREFIXES";
private static final String CIRCUMFIX_KEY = "CIRCUMFIX";
private static final String IGNORE_KEY = "IGNORE";
private static final String ICONV_KEY = "ICONV";
private static final String OCONV_KEY = "OCONV";
private static final String FULLSTRIP_KEY = "FULLSTRIP";
private static final String LANG_KEY = "LANG";
private static final String KEEPCASE_KEY = "KEEPCASE";
private static final String NEEDAFFIX_KEY = "NEEDAFFIX";
private static final String PSEUDOROOT_KEY = "PSEUDOROOT";
private static final String ONLYINCOMPOUND_KEY = "ONLYINCOMPOUND";
private static final String NUM_FLAG_TYPE = "num";
private static final String UTF8_FLAG_TYPE = "UTF-8";
private static final String LONG_FLAG_TYPE = "long";
// TODO: really for suffixes we should reverse the automaton and run them backwards
private static final String PREFIX_CONDITION_REGEX_PATTERN = "%s.*";
private static final String SUFFIX_CONDITION_REGEX_PATTERN = ".*%s";
FST prefixes;
FST suffixes;
// all condition checks used by prefixes and suffixes. these are typically re-used across
// many affix stripping rules. so these are deduplicated, to save RAM.
ArrayList patterns = new ArrayList<>();
// the entries in the .dic file, mapping to their set of flags.
// the fst output is the ordinal list for flagLookup
FST words;
// the list of unique flagsets (wordforms). theoretically huge, but practically
// small (e.g. for polish this is 756), otherwise humans wouldn't be able to deal with it either.
BytesRefHash flagLookup = new BytesRefHash();
// the list of unique strip affixes.
char[] stripData;
int[] stripOffsets;
// 8 bytes per affix
byte[] affixData = new byte[64];
private int currentAffix = 0;
private FlagParsingStrategy flagParsingStrategy = new SimpleFlagParsingStrategy(); // Default flag parsing strategy
// AF entries
private String[] aliases;
private int aliasCount = 0;
// AM entries
private String[] morphAliases;
private int morphAliasCount = 0;
// st: morphological entries (either directly, or aliased from AM)
private String[] stemExceptions = new String[8];
private int stemExceptionCount = 0;
// we set this during sorting, so we know to add an extra FST output.
// when set, some words have exceptional stems, and the last entry is a pointer to stemExceptions
boolean hasStemExceptions;
private final Path tempPath = getDefaultTempDir(); // TODO: make this configurable?
boolean ignoreCase;
boolean complexPrefixes;
boolean twoStageAffix; // if no affixes have continuation classes, no need to do 2-level affix stripping
int circumfix = -1; // circumfix flag, or -1 if one is not defined
int keepcase = -1; // keepcase flag, or -1 if one is not defined
int needaffix = -1; // needaffix flag, or -1 if one is not defined
int onlyincompound = -1; // onlyincompound flag, or -1 if one is not defined
// ignored characters (dictionary, affix, inputs)
private char[] ignore;
// FSTs used for ICONV/OCONV, output ord pointing to replacement text
FST iconv;
FST oconv;
boolean needsInputCleaning;
boolean needsOutputCleaning;
// true if we can strip suffixes "down to nothing"
boolean fullStrip;
// language declaration of the dictionary
String language;
// true if case algorithms should use alternate (Turkish/Azeri) mapping
boolean alternateCasing;
/**
* Creates a new Dictionary containing the information read from the provided InputStreams to hunspell affix
* and dictionary files.
* You have to close the provided InputStreams yourself.
*
* @param tempDir Directory to use for offline sorting
* @param tempFileNamePrefix prefix to use to generate temp file names
* @param affix InputStream for reading the hunspell affix file (won't be closed).
* @param dictionary InputStream for reading the hunspell dictionary file (won't be closed).
* @throws IOException Can be thrown while reading from the InputStreams
* @throws ParseException Can be thrown if the content of the files does not meet expected formats
*/
public Dictionary(Directory tempDir, String tempFileNamePrefix, InputStream affix, InputStream dictionary) throws IOException, ParseException {
this(tempDir, tempFileNamePrefix, affix, Collections.singletonList(dictionary), false);
}
/**
* Creates a new Dictionary containing the information read from the provided InputStreams to hunspell affix
* and dictionary files.
* You have to close the provided InputStreams yourself.
*
* @param tempDir Directory to use for offline sorting
* @param tempFileNamePrefix prefix to use to generate temp file names
* @param affix InputStream for reading the hunspell affix file (won't be closed).
* @param dictionaries InputStream for reading the hunspell dictionary files (won't be closed).
* @throws IOException Can be thrown while reading from the InputStreams
* @throws ParseException Can be thrown if the content of the files does not meet expected formats
*/
public Dictionary(Directory tempDir, String tempFileNamePrefix, InputStream affix, List dictionaries, boolean ignoreCase) throws IOException, ParseException {
this.ignoreCase = ignoreCase;
this.needsInputCleaning = ignoreCase;
this.needsOutputCleaning = false; // set if we have an OCONV
flagLookup.add(new BytesRef()); // no flags -> ord 0
Path aff = Files.createTempFile(tempPath, "affix", "aff");
OutputStream out = new BufferedOutputStream(Files.newOutputStream(aff));
InputStream aff1 = null;
InputStream aff2 = null;
boolean success = false;
try {
// copy contents of affix stream to temp file
final byte [] buffer = new byte [1024 * 8];
int len;
while ((len = affix.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
out.close();
// pass 1: get encoding
aff1 = new BufferedInputStream(Files.newInputStream(aff));
String encoding = getDictionaryEncoding(aff1);
// pass 2: parse affixes
CharsetDecoder decoder = getJavaEncoding(encoding);
aff2 = new BufferedInputStream(Files.newInputStream(aff));
readAffixFile(aff2, decoder);
// read dictionary entries
IntSequenceOutputs o = IntSequenceOutputs.getSingleton();
Builder b = new Builder<>(FST.INPUT_TYPE.BYTE4, o);
readDictionaryFiles(tempDir, tempFileNamePrefix, dictionaries, decoder, b);
words = b.finish();
aliases = null; // no longer needed
morphAliases = null; // no longer needed
success = true;
} finally {
IOUtils.closeWhileHandlingException(out, aff1, aff2);
if (success) {
Files.delete(aff);
} else {
IOUtils.deleteFilesIgnoringExceptions(aff);
}
}
}
/**
* Looks up Hunspell word forms from the dictionary
*/
IntsRef lookupWord(char word[], int offset, int length) {
return lookup(words, word, offset, length);
}
// only for testing
IntsRef lookupPrefix(char word[], int offset, int length) {
return lookup(prefixes, word, offset, length);
}
// only for testing
IntsRef lookupSuffix(char word[], int offset, int length) {
return lookup(suffixes, word, offset, length);
}
IntsRef lookup(FST fst, char word[], int offset, int length) {
if (fst == null) {
return null;
}
final FST.BytesReader bytesReader = fst.getBytesReader();
final FST.Arc arc = fst.getFirstArc(new FST.Arc());
// Accumulate output as we go
final IntsRef NO_OUTPUT = fst.outputs.getNoOutput();
IntsRef output = NO_OUTPUT;
int l = offset + length;
try {
for (int i = offset, cp = 0; i < l; i += Character.charCount(cp)) {
cp = Character.codePointAt(word, i, l);
if (fst.findTargetArc(cp, arc, arc, bytesReader) == null) {
return null;
} else if (arc.output() != NO_OUTPUT) {
output = fst.outputs.add(output, arc.output());
}
}
if (fst.findTargetArc(FST.END_LABEL, arc, arc, bytesReader) == null) {
return null;
} else if (arc.output() != NO_OUTPUT) {
return fst.outputs.add(output, arc.output());
} else {
return output;
}
} catch (IOException bogus) {
throw new RuntimeException(bogus);
}
}
/**
* Reads the affix file through the provided InputStream, building up the prefix and suffix maps
*
* @param affixStream InputStream to read the content of the affix file from
* @param decoder CharsetDecoder to decode the content of the file
* @throws IOException Can be thrown while reading from the InputStream
*/
private void readAffixFile(InputStream affixStream, CharsetDecoder decoder) throws IOException, ParseException {
TreeMap> prefixes = new TreeMap<>();
TreeMap> suffixes = new TreeMap<>();
Map seenPatterns = new HashMap<>();
// zero condition -> 0 ord
seenPatterns.put(".*", 0);
patterns.add(null);
// zero strip -> 0 ord
Map seenStrips = new LinkedHashMap<>();
seenStrips.put("", 0);
LineNumberReader reader = new LineNumberReader(new InputStreamReader(affixStream, decoder));
String line = null;
while ((line = reader.readLine()) != null) {
// ignore any BOM marker on first line
if (reader.getLineNumber() == 1 && line.startsWith("\uFEFF")) {
line = line.substring(1);
}
if (line.startsWith(ALIAS_KEY)) {
parseAlias(line);
} else if (line.startsWith(MORPH_ALIAS_KEY)) {
parseMorphAlias(line);
} else if (line.startsWith(PREFIX_KEY)) {
parseAffix(prefixes, line, reader, PREFIX_CONDITION_REGEX_PATTERN, seenPatterns, seenStrips);
} else if (line.startsWith(SUFFIX_KEY)) {
parseAffix(suffixes, line, reader, SUFFIX_CONDITION_REGEX_PATTERN, seenPatterns, seenStrips);
} else if (line.startsWith(FLAG_KEY)) {
// Assume that the FLAG line comes before any prefix or suffixes
// Store the strategy so it can be used when parsing the dic file
flagParsingStrategy = getFlagParsingStrategy(line);
} else if (line.equals(COMPLEXPREFIXES_KEY)) {
complexPrefixes = true; // 2-stage prefix+1-stage suffix instead of 2-stage suffix+1-stage prefix
} else if (line.startsWith(CIRCUMFIX_KEY)) {
String parts[] = line.split("\\s+");
if (parts.length != 2) {
throw new ParseException("Illegal CIRCUMFIX declaration", reader.getLineNumber());
}
circumfix = flagParsingStrategy.parseFlag(parts[1]);
} else if (line.startsWith(KEEPCASE_KEY)) {
String parts[] = line.split("\\s+");
if (parts.length != 2) {
throw new ParseException("Illegal KEEPCASE declaration", reader.getLineNumber());
}
keepcase = flagParsingStrategy.parseFlag(parts[1]);
} else if (line.startsWith(NEEDAFFIX_KEY) || line.startsWith(PSEUDOROOT_KEY)) {
String parts[] = line.split("\\s+");
if (parts.length != 2) {
throw new ParseException("Illegal NEEDAFFIX declaration", reader.getLineNumber());
}
needaffix = flagParsingStrategy.parseFlag(parts[1]);
} else if (line.startsWith(ONLYINCOMPOUND_KEY)) {
String parts[] = line.split("\\s+");
if (parts.length != 2) {
throw new ParseException("Illegal ONLYINCOMPOUND declaration", reader.getLineNumber());
}
onlyincompound = flagParsingStrategy.parseFlag(parts[1]);
} else if (line.startsWith(IGNORE_KEY)) {
String parts[] = line.split("\\s+");
if (parts.length != 2) {
throw new ParseException("Illegal IGNORE declaration", reader.getLineNumber());
}
ignore = parts[1].toCharArray();
Arrays.sort(ignore);
needsInputCleaning = true;
} else if (line.startsWith(ICONV_KEY) || line.startsWith(OCONV_KEY)) {
String parts[] = line.split("\\s+");
String type = parts[0];
if (parts.length != 2) {
throw new ParseException("Illegal " + type + " declaration", reader.getLineNumber());
}
int num = Integer.parseInt(parts[1]);
FST res = parseConversions(reader, num);
if (type.equals("ICONV")) {
iconv = res;
needsInputCleaning |= iconv != null;
} else {
oconv = res;
needsOutputCleaning |= oconv != null;
}
} else if (line.startsWith(FULLSTRIP_KEY)) {
fullStrip = true;
} else if (line.startsWith(LANG_KEY)) {
language = line.substring(LANG_KEY.length()).trim();
alternateCasing = "tr_TR".equals(language) || "az_AZ".equals(language);
}
}
this.prefixes = affixFST(prefixes);
this.suffixes = affixFST(suffixes);
int totalChars = 0;
for (String strip : seenStrips.keySet()) {
totalChars += strip.length();
}
stripData = new char[totalChars];
stripOffsets = new int[seenStrips.size()+1];
int currentOffset = 0;
int currentIndex = 0;
for (String strip : seenStrips.keySet()) {
stripOffsets[currentIndex++] = currentOffset;
strip.getChars(0, strip.length(), stripData, currentOffset);
currentOffset += strip.length();
}
assert currentIndex == seenStrips.size();
stripOffsets[currentIndex] = currentOffset;
}
private FST affixFST(TreeMap> affixes) throws IOException {
IntSequenceOutputs outputs = IntSequenceOutputs.getSingleton();
Builder builder = new Builder<>(FST.INPUT_TYPE.BYTE4, outputs);
IntsRefBuilder scratch = new IntsRefBuilder();
for (Map.Entry> entry : affixes.entrySet()) {
Util.toUTF32(entry.getKey(), scratch);
List entries = entry.getValue();
IntsRef output = new IntsRef(entries.size());
for (Integer c : entries) {
output.ints[output.length++] = c;
}
builder.add(scratch.get(), output);
}
return builder.finish();
}
static String escapeDash(String re) {
// we have to be careful, even though dash doesn't have a special meaning,
// some dictionaries already escape it (e.g. pt_PT), so we don't want to nullify it
StringBuilder escaped = new StringBuilder();
for (int i = 0; i < re.length(); i++) {
char c = re.charAt(i);
if (c == '-') {
escaped.append("\\-");
} else {
escaped.append(c);
if (c == '\\' && i + 1 < re.length()) {
escaped.append(re.charAt(i+1));
i++;
}
}
}
return escaped.toString();
}
/**
* Parses a specific affix rule putting the result into the provided affix map
*
* @param affixes Map where the result of the parsing will be put
* @param header Header line of the affix rule
* @param reader BufferedReader to read the content of the rule from
* @param conditionPattern {@link String#format(String, Object...)} pattern to be used to generate the condition regex
* pattern
* @param seenPatterns map from condition -> index of patterns, for deduplication.
* @throws IOException Can be thrown while reading the rule
*/
private void parseAffix(TreeMap> affixes,
String header,
LineNumberReader reader,
String conditionPattern,
Map seenPatterns,
Map seenStrips) throws IOException, ParseException {
BytesRefBuilder scratch = new BytesRefBuilder();
StringBuilder sb = new StringBuilder();
String args[] = header.split("\\s+");
boolean crossProduct = args[2].equals("Y");
boolean isSuffix = conditionPattern == SUFFIX_CONDITION_REGEX_PATTERN;
int numLines = Integer.parseInt(args[3]);
affixData = ArrayUtil.grow(affixData, (currentAffix << 3) + (numLines << 3));
ByteArrayDataOutput affixWriter = new ByteArrayDataOutput(affixData, currentAffix << 3, numLines << 3);
for (int i = 0; i < numLines; i++) {
assert affixWriter.getPosition() == currentAffix << 3;
String line = reader.readLine();
String ruleArgs[] = line.split("\\s+");
// from the manpage: PFX flag stripping prefix [condition [morphological_fields...]]
// condition is optional
if (ruleArgs.length < 4) {
throw new ParseException("The affix file contains a rule with less than four elements: " + line, reader.getLineNumber());
}
char flag = flagParsingStrategy.parseFlag(ruleArgs[1]);
String strip = ruleArgs[2].equals("0") ? "" : ruleArgs[2];
String affixArg = ruleArgs[3];
char appendFlags[] = null;
// first: parse continuation classes out of affix
int flagSep = affixArg.lastIndexOf('/');
if (flagSep != -1) {
String flagPart = affixArg.substring(flagSep + 1);
affixArg = affixArg.substring(0, flagSep);
if (aliasCount > 0) {
flagPart = getAliasValue(Integer.parseInt(flagPart));
}
appendFlags = flagParsingStrategy.parseFlags(flagPart);
Arrays.sort(appendFlags);
twoStageAffix = true;
}
// zero affix -> empty string
if ("0".equals(affixArg)) {
affixArg = "";
}
String condition = ruleArgs.length > 4 ? ruleArgs[4] : ".";
// at least the gascon affix file has this issue
if (condition.startsWith("[") && condition.indexOf(']') == -1) {
condition = condition + "]";
}
// "dash hasn't got special meaning" (we must escape it)
if (condition.indexOf('-') >= 0) {
condition = escapeDash(condition);
}
final String regex;
if (".".equals(condition)) {
regex = ".*"; // Zero condition is indicated by dot
} else if (condition.equals(strip)) {
regex = ".*"; // TODO: optimize this better:
// if we remove 'strip' from condition, we don't have to append 'strip' to check it...!
// but this is complicated...
} else {
regex = String.format(Locale.ROOT, conditionPattern, condition);
}
// deduplicate patterns
Integer patternIndex = seenPatterns.get(regex);
if (patternIndex == null) {
patternIndex = patterns.size();
if (patternIndex > Short.MAX_VALUE) {
throw new UnsupportedOperationException("Too many patterns, please report this to [email protected]");
}
seenPatterns.put(regex, patternIndex);
CharacterRunAutomaton pattern = new CharacterRunAutomaton(new RegExp(regex, RegExp.NONE).toAutomaton());
patterns.add(pattern);
}
Integer stripOrd = seenStrips.get(strip);
if (stripOrd == null) {
stripOrd = seenStrips.size();
seenStrips.put(strip, stripOrd);
if (stripOrd > Character.MAX_VALUE) {
throw new UnsupportedOperationException("Too many unique strips, please report this to [email protected]");
}
}
if (appendFlags == null) {
appendFlags = NOFLAGS;
}
encodeFlags(scratch, appendFlags);
int appendFlagsOrd = flagLookup.add(scratch.get());
if (appendFlagsOrd < 0) {
// already exists in our hash
appendFlagsOrd = (-appendFlagsOrd)-1;
} else if (appendFlagsOrd > Short.MAX_VALUE) {
// this limit is probably flexible, but it's a good sanity check too
throw new UnsupportedOperationException("Too many unique append flags, please report this to [email protected]");
}
affixWriter.writeShort((short)flag);
affixWriter.writeShort((short)stripOrd.intValue());
// encode crossProduct into patternIndex
int patternOrd = patternIndex.intValue() << 1 | (crossProduct ? 1 : 0);
affixWriter.writeShort((short)patternOrd);
affixWriter.writeShort((short)appendFlagsOrd);
if (needsInputCleaning) {
CharSequence cleaned = cleanInput(affixArg, sb);
affixArg = cleaned.toString();
}
if (isSuffix) {
affixArg = new StringBuilder(affixArg).reverse().toString();
}
List list = affixes.get(affixArg);
if (list == null) {
list = new ArrayList<>();
affixes.put(affixArg, list);
}
list.add(currentAffix);
currentAffix++;
}
}
private FST parseConversions(LineNumberReader reader, int num) throws IOException, ParseException {
Map mappings = new TreeMap<>();
for (int i = 0; i < num; i++) {
String line = reader.readLine();
String parts[] = line.split("\\s+");
if (parts.length != 3) {
throw new ParseException("invalid syntax: " + line, reader.getLineNumber());
}
if (mappings.put(parts[1], parts[2]) != null) {
throw new IllegalStateException("duplicate mapping specified for: " + parts[1]);
}
}
Outputs outputs = CharSequenceOutputs.getSingleton();
Builder builder = new Builder<>(FST.INPUT_TYPE.BYTE2, outputs);
IntsRefBuilder scratchInts = new IntsRefBuilder();
for (Map.Entry entry : mappings.entrySet()) {
Util.toUTF16(entry.getKey(), scratchInts);
builder.add(scratchInts.get(), new CharsRef(entry.getValue()));
}
return builder.finish();
}
/** pattern accepts optional BOM + SET + any whitespace */
final static Pattern ENCODING_PATTERN = Pattern.compile("^(\u00EF\u00BB\u00BF)?SET\\s+");
/**
* Parses the encoding specified in the affix file readable through the provided InputStream
*
* @param affix InputStream for reading the affix file
* @return Encoding specified in the affix file
* @throws IOException Can be thrown while reading from the InputStream
* @throws ParseException Thrown if the first non-empty non-comment line read from the file does not adhere to the format {@code SET }
*/
static String getDictionaryEncoding(InputStream affix) throws IOException, ParseException {
final StringBuilder encoding = new StringBuilder();
for (;;) {
encoding.setLength(0);
int ch;
while ((ch = affix.read()) >= 0) {
if (ch == '\n') {
break;
}
if (ch != '\r') {
encoding.append((char)ch);
}
}
if (
encoding.length() == 0 || encoding.charAt(0) == '#' ||
// this test only at the end as ineffective but would allow lines only containing spaces:
encoding.toString().trim().length() == 0
) {
if (ch < 0) {
throw new ParseException("Unexpected end of affix file.", 0);
}
continue;
}
Matcher matcher = ENCODING_PATTERN.matcher(encoding);
if (matcher.find()) {
int last = matcher.end();
return encoding.substring(last).trim();
}
}
}
static final Map CHARSET_ALIASES;
static {
Map m = new HashMap<>();
m.put("microsoft-cp1251", "windows-1251");
m.put("TIS620-2533", "TIS-620");
CHARSET_ALIASES = Collections.unmodifiableMap(m);
}
/**
* Retrieves the CharsetDecoder for the given encoding. Note, This isn't perfect as I think ISCII-DEVANAGARI and
* MICROSOFT-CP1251 etc are allowed...
*
* @param encoding Encoding to retrieve the CharsetDecoder for
* @return CharSetDecoder for the given encoding
*/
private CharsetDecoder getJavaEncoding(String encoding) {
if ("ISO8859-14".equals(encoding)) {
return new ISO8859_14Decoder();
}
String canon = CHARSET_ALIASES.get(encoding);
if (canon != null) {
encoding = canon;
}
Charset charset = Charset.forName(encoding);
return charset.newDecoder().onMalformedInput(CodingErrorAction.REPLACE);
}
/**
* Determines the appropriate {@link FlagParsingStrategy} based on the FLAG definition line taken from the affix file
*
* @param flagLine Line containing the flag information
* @return FlagParsingStrategy that handles parsing flags in the way specified in the FLAG definition
*/
static FlagParsingStrategy getFlagParsingStrategy(String flagLine) {
String parts[] = flagLine.split("\\s+");
if (parts.length != 2) {
throw new IllegalArgumentException("Illegal FLAG specification: " + flagLine);
}
String flagType = parts[1];
if (NUM_FLAG_TYPE.equals(flagType)) {
return new NumFlagParsingStrategy();
} else if (UTF8_FLAG_TYPE.equals(flagType)) {
return new SimpleFlagParsingStrategy();
} else if (LONG_FLAG_TYPE.equals(flagType)) {
return new DoubleASCIIFlagParsingStrategy();
}
throw new IllegalArgumentException("Unknown flag type: " + flagType);
}
final char FLAG_SEPARATOR = 0x1f; // flag separator after escaping
final char MORPH_SEPARATOR = 0x1e; // separator for boundary of entry (may be followed by morph data)
String unescapeEntry(String entry) {
StringBuilder sb = new StringBuilder();
int end = morphBoundary(entry);
for (int i = 0; i < end; i++) {
char ch = entry.charAt(i);
if (ch == '\\' && i+1 < entry.length()) {
sb.append(entry.charAt(i+1));
i++;
} else if (ch == '/') {
sb.append(FLAG_SEPARATOR);
} else if (ch == MORPH_SEPARATOR || ch == FLAG_SEPARATOR) {
// BINARY EXECUTABLES EMBEDDED IN ZULU DICTIONARIES!!!!!!!
} else {
sb.append(ch);
}
}
sb.append(MORPH_SEPARATOR);
if (end < entry.length()) {
for (int i = end; i < entry.length(); i++) {
char c = entry.charAt(i);
if (c == FLAG_SEPARATOR || c == MORPH_SEPARATOR) {
// BINARY EXECUTABLES EMBEDDED IN ZULU DICTIONARIES!!!!!!!
} else {
sb.append(c);
}
}
}
return sb.toString();
}
static int morphBoundary(String line) {
int end = indexOfSpaceOrTab(line, 0);
if (end == -1) {
return line.length();
}
while (end >= 0 && end < line.length()) {
if (line.charAt(end) == '\t' ||
end+3 < line.length() &&
Character.isLetter(line.charAt(end+1)) &&
Character.isLetter(line.charAt(end+2)) &&
line.charAt(end+3) == ':') {
break;
}
end = indexOfSpaceOrTab(line, end+1);
}
if (end == -1) {
return line.length();
}
return end;
}
static int indexOfSpaceOrTab(String text, int start) {
int pos1 = text.indexOf('\t', start);
int pos2 = text.indexOf(' ', start);
if (pos1 >= 0 && pos2 >= 0) {
return Math.min(pos1, pos2);
} else {
return Math.max(pos1, pos2);
}
}
/**
* Reads the dictionary file through the provided InputStreams, building up the words map
*
* @param dictionaries InputStreams to read the dictionary file through
* @param decoder CharsetDecoder used to decode the contents of the file
* @throws IOException Can be thrown while reading from the file
*/
private void readDictionaryFiles(Directory tempDir, String tempFileNamePrefix, List dictionaries, CharsetDecoder decoder, Builder words) throws IOException {
BytesRefBuilder flagsScratch = new BytesRefBuilder();
IntsRefBuilder scratchInts = new IntsRefBuilder();
StringBuilder sb = new StringBuilder();
IndexOutput unsorted = tempDir.createTempOutput(tempFileNamePrefix, "dat", IOContext.DEFAULT);
try (ByteSequencesWriter writer = new ByteSequencesWriter(unsorted)) {
for (InputStream dictionary : dictionaries) {
BufferedReader lines = new BufferedReader(new InputStreamReader(dictionary, decoder));
String line = lines.readLine(); // first line is number of entries (approximately, sometimes)
while ((line = lines.readLine()) != null) {
// wild and unpredictable code comment rules
if (line.isEmpty() || line.charAt(0) == '/' || line.charAt(0) == '#' || line.charAt(0) == '\t') {
continue;
}
line = unescapeEntry(line);
// if we havent seen any stem exceptions, try to parse one
if (hasStemExceptions == false) {
int morphStart = line.indexOf(MORPH_SEPARATOR);
if (morphStart >= 0 && morphStart < line.length()) {
hasStemExceptions = parseStemException(line.substring(morphStart+1)) != null;
}
}
if (needsInputCleaning) {
int flagSep = line.indexOf(FLAG_SEPARATOR);
if (flagSep == -1) {
flagSep = line.indexOf(MORPH_SEPARATOR);
}
if (flagSep == -1) {
CharSequence cleansed = cleanInput(line, sb);
writer.write(cleansed.toString().getBytes(StandardCharsets.UTF_8));
} else {
String text = line.substring(0, flagSep);
CharSequence cleansed = cleanInput(text, sb);
if (cleansed != sb) {
sb.setLength(0);
sb.append(cleansed);
}
sb.append(line.substring(flagSep));
writer.write(sb.toString().getBytes(StandardCharsets.UTF_8));
}
} else {
writer.write(line.getBytes(StandardCharsets.UTF_8));
}
}
}
CodecUtil.writeFooter(unsorted);
}
OfflineSorter sorter = new OfflineSorter(tempDir, tempFileNamePrefix, new Comparator() {
BytesRef scratch1 = new BytesRef();
BytesRef scratch2 = new BytesRef();
@Override
public int compare(BytesRef o1, BytesRef o2) {
scratch1.bytes = o1.bytes;
scratch1.offset = o1.offset;
scratch1.length = o1.length;
for (int i = scratch1.length - 1; i >= 0; i--) {
if (scratch1.bytes[scratch1.offset + i] == FLAG_SEPARATOR || scratch1.bytes[scratch1.offset + i] == MORPH_SEPARATOR) {
scratch1.length = i;
break;
}
}
scratch2.bytes = o2.bytes;
scratch2.offset = o2.offset;
scratch2.length = o2.length;
for (int i = scratch2.length - 1; i >= 0; i--) {
if (scratch2.bytes[scratch2.offset + i] == FLAG_SEPARATOR || scratch2.bytes[scratch2.offset + i] == MORPH_SEPARATOR) {
scratch2.length = i;
break;
}
}
int cmp = scratch1.compareTo(scratch2);
if (cmp == 0) {
// tie break on whole row
return o1.compareTo(o2);
} else {
return cmp;
}
}
});
String sorted;
boolean success = false;
try {
sorted = sorter.sort(unsorted.getName());
success = true;
} finally {
if (success) {
tempDir.deleteFile(unsorted.getName());
} else {
IOUtils.deleteFilesIgnoringExceptions(tempDir, unsorted.getName());
}
}
boolean success2 = false;
try (ByteSequencesReader reader = new ByteSequencesReader(tempDir.openChecksumInput(sorted, IOContext.READONCE), sorted)) {
// TODO: the flags themselves can be double-chars (long) or also numeric
// either way the trick is to encode them as char... but they must be parsed differently
String currentEntry = null;
IntsRefBuilder currentOrds = new IntsRefBuilder();
while (true) {
BytesRef scratch = reader.next();
if (scratch == null) {
break;
}
String line = scratch.utf8ToString();
String entry;
char wordForm[];
int end;
int flagSep = line.indexOf(FLAG_SEPARATOR);
if (flagSep == -1) {
wordForm = NOFLAGS;
end = line.indexOf(MORPH_SEPARATOR);
entry = line.substring(0, end);
} else {
end = line.indexOf(MORPH_SEPARATOR);
String flagPart = line.substring(flagSep + 1, end);
if (aliasCount > 0) {
flagPart = getAliasValue(Integer.parseInt(flagPart));
}
wordForm = flagParsingStrategy.parseFlags(flagPart);
Arrays.sort(wordForm);
entry = line.substring(0, flagSep);
}
// we possibly have morphological data
int stemExceptionID = 0;
if (hasStemExceptions && end+1 < line.length()) {
String stemException = parseStemException(line.substring(end+1));
if (stemException != null) {
stemExceptions = ArrayUtil.grow(stemExceptions, stemExceptionCount+1);
stemExceptionID = stemExceptionCount+1; // we use '0' to indicate no exception for the form
stemExceptions[stemExceptionCount++] = stemException;
}
}
int cmp = currentEntry == null ? 1 : entry.compareTo(currentEntry);
if (cmp < 0) {
throw new IllegalArgumentException("out of order: " + entry + " < " + currentEntry);
} else {
encodeFlags(flagsScratch, wordForm);
int ord = flagLookup.add(flagsScratch.get());
if (ord < 0) {
// already exists in our hash
ord = (-ord)-1;
}
// finalize current entry, and switch "current" if necessary
if (cmp > 0 && currentEntry != null) {
Util.toUTF32(currentEntry, scratchInts);
words.add(scratchInts.get(), currentOrds.get());
}
// swap current
if (cmp > 0 || currentEntry == null) {
currentEntry = entry;
currentOrds = new IntsRefBuilder(); // must be this way
}
if (hasStemExceptions) {
currentOrds.append(ord);
currentOrds.append(stemExceptionID);
} else {
currentOrds.append(ord);
}
}
}
// finalize last entry
Util.toUTF32(currentEntry, scratchInts);
words.add(scratchInts.get(), currentOrds.get());
success2 = true;
} finally {
if (success2) {
tempDir.deleteFile(sorted);
} else {
IOUtils.deleteFilesIgnoringExceptions(tempDir, sorted);
}
}
}
static char[] decodeFlags(BytesRef b) {
if (b.length == 0) {
return CharsRef.EMPTY_CHARS;
}
int len = b.length >>> 1;
char flags[] = new char[len];
int upto = 0;
int end = b.offset + b.length;
for (int i = b.offset; i < end; i += 2) {
flags[upto++] = (char)((b.bytes[i] << 8) | (b.bytes[i+1] & 0xff));
}
return flags;
}
static void encodeFlags(BytesRefBuilder b, char flags[]) {
int len = flags.length << 1;
b.grow(len);
b.clear();
for (int i = 0; i < flags.length; i++) {
int flag = flags[i];
b.append((byte) ((flag >> 8) & 0xff));
b.append((byte) (flag & 0xff));
}
}
private void parseAlias(String line) {
String ruleArgs[] = line.split("\\s+");
if (aliases == null) {
//first line should be the aliases count
final int count = Integer.parseInt(ruleArgs[1]);
aliases = new String[count];
} else {
// an alias can map to no flags
String aliasValue = ruleArgs.length == 1 ? "" : ruleArgs[1];
aliases[aliasCount++] = aliasValue;
}
}
private String getAliasValue(int id) {
try {
return aliases[id - 1];
} catch (IndexOutOfBoundsException ex) {
throw new IllegalArgumentException("Bad flag alias number:" + id, ex);
}
}
String getStemException(int id) {
return stemExceptions[id-1];
}
private void parseMorphAlias(String line) {
if (morphAliases == null) {
//first line should be the aliases count
final int count = Integer.parseInt(line.substring(3));
morphAliases = new String[count];
} else {
String arg = line.substring(2); // leave the space
morphAliases[morphAliasCount++] = arg;
}
}
private String parseStemException(String morphData) {
// first see if it's an alias
if (morphAliasCount > 0) {
try {
int alias = Integer.parseInt(morphData.trim());
morphData = morphAliases[alias-1];
} catch (NumberFormatException e) {
// fine
}
}
// try to parse morph entry
int index = morphData.indexOf(" st:");
if (index < 0) {
index = morphData.indexOf("\tst:");
}
if (index >= 0) {
int endIndex = indexOfSpaceOrTab(morphData, index+1);
if (endIndex < 0) {
endIndex = morphData.length();
}
return morphData.substring(index+4, endIndex);
}
return null;
}
/**
* Abstraction of the process of parsing flags taken from the affix and dic files
*/
static abstract class FlagParsingStrategy {
/**
* Parses the given String into a single flag
*
* @param rawFlag String to parse into a flag
* @return Parsed flag
*/
char parseFlag(String rawFlag) {
char flags[] = parseFlags(rawFlag);
if (flags.length != 1) {
throw new IllegalArgumentException("expected only one flag, got: " + rawFlag);
}
return flags[0];
}
/**
* Parses the given String into multiple flags
*
* @param rawFlags String to parse into flags
* @return Parsed flags
*/
abstract char[] parseFlags(String rawFlags);
}
/**
* Simple implementation of {@link FlagParsingStrategy} that treats the chars in each String as a individual flags.
* Can be used with both the ASCII and UTF-8 flag types.
*/
private static class SimpleFlagParsingStrategy extends FlagParsingStrategy {
@Override
public char[] parseFlags(String rawFlags) {
return rawFlags.toCharArray();
}
}
/**
* Implementation of {@link FlagParsingStrategy} that assumes each flag is encoded in its numerical form. In the case
* of multiple flags, each number is separated by a comma.
*/
private static class NumFlagParsingStrategy extends FlagParsingStrategy {
@Override
public char[] parseFlags(String rawFlags) {
String[] rawFlagParts = rawFlags.trim().split(",");
char[] flags = new char[rawFlagParts.length];
int upto = 0;
for (int i = 0; i < rawFlagParts.length; i++) {
// note, removing the trailing X/leading I for nepali... what is the rule here?!
String replacement = rawFlagParts[i].replaceAll("[^0-9]", "");
// note, ignoring empty flags (this happens in danish, for example)
if (replacement.isEmpty()) {
continue;
}
flags[upto++] = (char) Integer.parseInt(replacement);
}
if (upto < flags.length) {
flags = ArrayUtil.copyOfSubArray(flags, 0, upto);
}
return flags;
}
}
/**
* Implementation of {@link FlagParsingStrategy} that assumes each flag is encoded as two ASCII characters whose codes
* must be combined into a single character.
*/
private static class DoubleASCIIFlagParsingStrategy extends FlagParsingStrategy {
@Override
public char[] parseFlags(String rawFlags) {
if (rawFlags.length() == 0) {
return new char[0];
}
StringBuilder builder = new StringBuilder();
if (rawFlags.length() % 2 == 1) {
throw new IllegalArgumentException("Invalid flags (should be even number of characters): " + rawFlags);
}
for (int i = 0; i < rawFlags.length(); i+=2) {
char f1 = rawFlags.charAt(i);
char f2 = rawFlags.charAt(i+1);
if (f1 >= 256 || f2 >= 256) {
throw new IllegalArgumentException("Invalid flags (LONG flags must be double ASCII): " + rawFlags);
}
char combined = (char) (f1 << 8 | f2);
builder.append(combined);
}
char flags[] = new char[builder.length()];
builder.getChars(0, builder.length(), flags, 0);
return flags;
}
}
static boolean hasFlag(char flags[], char flag) {
return Arrays.binarySearch(flags, flag) >= 0;
}
CharSequence cleanInput(CharSequence input, StringBuilder reuse) {
reuse.setLength(0);
for (int i = 0; i < input.length(); i++) {
char ch = input.charAt(i);
if (ignore != null && Arrays.binarySearch(ignore, ch) >= 0) {
continue;
}
if (ignoreCase && iconv == null) {
// if we have no input conversion mappings, do this on-the-fly
ch = caseFold(ch);
}
reuse.append(ch);
}
if (iconv != null) {
try {
applyMappings(iconv, reuse);
} catch (IOException bogus) {
throw new RuntimeException(bogus);
}
if (ignoreCase) {
for (int i = 0; i < reuse.length(); i++) {
reuse.setCharAt(i, caseFold(reuse.charAt(i)));
}
}
}
return reuse;
}
/** folds single character (according to LANG if present) */
char caseFold(char c) {
if (alternateCasing) {
if (c == 'I') {
return 'ı';
} else if (c == 'İ') {
return 'i';
} else {
return Character.toLowerCase(c);
}
} else {
return Character.toLowerCase(c);
}
}
// TODO: this could be more efficient!
static void applyMappings(FST fst, StringBuilder sb) throws IOException {
final FST.BytesReader bytesReader = fst.getBytesReader();
final FST.Arc firstArc = fst.getFirstArc(new FST.Arc());
final CharsRef NO_OUTPUT = fst.outputs.getNoOutput();
// temporary stuff
final FST.Arc arc = new FST.Arc<>();
int longestMatch;
CharsRef longestOutput;
for (int i = 0; i < sb.length(); i++) {
arc.copyFrom(firstArc);
CharsRef output = NO_OUTPUT;
longestMatch = -1;
longestOutput = null;
for (int j = i; j < sb.length(); j++) {
char ch = sb.charAt(j);
if (fst.findTargetArc(ch, arc, arc, bytesReader) == null) {
break;
} else {
output = fst.outputs.add(output, arc.output());
}
if (arc.isFinal()) {
longestOutput = fst.outputs.add(output, arc.nextFinalOutput());
longestMatch = j;
}
}
if (longestMatch >= 0) {
sb.delete(i, longestMatch+1);
sb.insert(i, longestOutput);
i += (longestOutput.length - 1);
}
}
}
/** Returns true if this dictionary was constructed with the {@code ignoreCase} option */
public boolean getIgnoreCase() {
return ignoreCase;
}
private static Path DEFAULT_TEMP_DIR;
/** Used by test framework */
public static void setDefaultTempDir(Path tempDir) {
DEFAULT_TEMP_DIR = tempDir;
}
/**
* Returns the default temporary directory. By default, java.io.tmpdir. If not accessible
* or not available, an IOException is thrown
*/
synchronized static Path getDefaultTempDir() throws IOException {
if (DEFAULT_TEMP_DIR == null) {
// Lazy init
String tempDirPath = System.getProperty("java.io.tmpdir");
if (tempDirPath == null) {
throw new IOException("Java has no temporary folder property (java.io.tmpdir)?");
}
Path tempDirectory = Paths.get(tempDirPath);
if (Files.isWritable(tempDirectory) == false) {
throw new IOException("Java's temporary folder not present or writeable?: "
+ tempDirectory.toAbsolutePath());
}
DEFAULT_TEMP_DIR = tempDirectory;
}
return DEFAULT_TEMP_DIR;
}
}
