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18 package org.apache.commons.codec.language.bm;
19
20 import java.util.ArrayList;
21 import java.util.Arrays;
22 import java.util.Collections;
23 import java.util.Comparator;
24 import java.util.EnumMap;
25 import java.util.HashMap;
26 import java.util.HashSet;
27 import java.util.List;
28 import java.util.Map;
29 import java.util.Scanner;
30 import java.util.Set;
31 import java.util.regex.Matcher;
32 import java.util.regex.Pattern;
33
34 import org.apache.commons.codec.Resources;
35 import org.apache.commons.codec.language.bm.Languages.LanguageSet;
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85 public class Rule {
86
87 public static final class Phoneme implements PhonemeExpr {
88
89 public static final Comparator<Phoneme> COMPARATOR = (o1, o2) -> {
90 final int o1Length = o1.phonemeText.length();
91 final int o2Length = o2.phonemeText.length();
92 for (int i = 0; i < o1Length; i++) {
93 if (i >= o2Length) {
94 return +1;
95 }
96 final int c = o1.phonemeText.charAt(i) - o2.phonemeText.charAt(i);
97 if (c != 0) {
98 return c;
99 }
100 }
101
102 if (o1Length < o2Length) {
103 return -1;
104 }
105
106 return 0;
107 };
108 private final StringBuilder phonemeText;
109
110 private final Languages.LanguageSet languages;
111
112 public Phoneme(final CharSequence phonemeText, final Languages.LanguageSet languages) {
113 this.phonemeText = new StringBuilder(phonemeText);
114 this.languages = languages;
115 }
116
117 public Phoneme(final Phoneme phonemeLeft, final Phoneme phonemeRight) {
118 this(phonemeLeft.phonemeText, phonemeLeft.languages);
119 this.phonemeText.append(phonemeRight.phonemeText);
120 }
121
122 public Phoneme(final Phoneme phonemeLeft, final Phoneme phonemeRight, final Languages.LanguageSet languages) {
123 this(phonemeLeft.phonemeText, languages);
124 this.phonemeText.append(phonemeRight.phonemeText);
125 }
126
127 public Phoneme append(final CharSequence str) {
128 this.phonemeText.append(str);
129 return this;
130 }
131
132 public Languages.LanguageSet getLanguages() {
133 return this.languages;
134 }
135
136 @Override
137 public Iterable<Phoneme> getPhonemes() {
138 return Collections.singleton(this);
139 }
140
141 public CharSequence getPhonemeText() {
142 return this.phonemeText;
143 }
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151
152 @Deprecated
153 public Phoneme join(final Phoneme right) {
154 return new Phoneme(this.phonemeText.toString() + right.phonemeText.toString(),
155 this.languages.restrictTo(right.languages));
156 }
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165 public Phoneme mergeWithLanguage(final LanguageSet lang) {
166 return new Phoneme(this.phonemeText.toString(), this.languages.merge(lang));
167 }
168
169 @Override
170 public String toString() {
171 return phonemeText.toString() + "[" + languages + "]";
172 }
173 }
174
175 public interface PhonemeExpr {
176 Iterable<Phoneme> getPhonemes();
177 }
178
179 public static final class PhonemeList implements PhonemeExpr {
180
181 private final List<Phoneme> phonemes;
182
183 public PhonemeList(final List<Phoneme> phonemes) {
184 this.phonemes = phonemes;
185 }
186
187 @Override
188 public List<Phoneme> getPhonemes() {
189 return this.phonemes;
190 }
191 }
192
193
194
195
196 public interface RPattern {
197 boolean isMatch(CharSequence input);
198 }
199
200 public static final RPattern ALL_STRINGS_RMATCHER = input -> true;
201
202 public static final String ALL = "ALL";
203
204 private static final String DOUBLE_QUOTE = "\"";
205
206 private static final String HASH_INCLUDE = "#include";
207
208 private static final int HASH_INCLUDE_LENGTH = HASH_INCLUDE.length();
209
210 private static final Map<NameType, Map<RuleType, Map<String, Map<String, List<Rule>>>>> RULES =
211 new EnumMap<>(NameType.class);
212
213 static {
214 for (final NameType s : NameType.values()) {
215 final Map<RuleType, Map<String, Map<String, List<Rule>>>> rts =
216 new EnumMap<>(RuleType.class);
217
218 for (final RuleType rt : RuleType.values()) {
219 final Map<String, Map<String, List<Rule>>> rs = new HashMap<>();
220
221 final Languages ls = Languages.getInstance(s);
222 ls.getLanguages().forEach(l -> {
223 try (final Scanner scanner = createScanner(s, rt, l)) {
224 rs.put(l, parseRules(scanner, createResourceName(s, rt, l)));
225 } catch (final IllegalStateException e) {
226 throw new IllegalStateException("Problem processing " + createResourceName(s, rt, l), e);
227 }
228 });
229 if (!rt.equals(RuleType.RULES)) {
230 try (final Scanner scanner = createScanner(s, rt, "common")) {
231 rs.put("common", parseRules(scanner, createResourceName(s, rt, "common")));
232 }
233 }
234
235 rts.put(rt, Collections.unmodifiableMap(rs));
236 }
237
238 RULES.put(s, Collections.unmodifiableMap(rts));
239 }
240 }
241
242 private static boolean contains(final CharSequence chars, final char input) {
243 return chars.chars().anyMatch(c -> c == input);
244 }
245
246 private static String createResourceName(final NameType nameType, final RuleType rt, final String lang) {
247 return String.format("org/apache/commons/codec/language/bm/%s_%s_%s.txt",
248 nameType.getName(), rt.getName(), lang);
249 }
250
251 @SuppressWarnings("resource")
252 private static Scanner createScanner(final NameType nameType, final RuleType rt, final String lang) {
253 final String resName = createResourceName(nameType, rt, lang);
254 return new Scanner(Resources.getInputStream(resName), ResourceConstants.ENCODING);
255 }
256
257 @SuppressWarnings("resource")
258 private static Scanner createScanner(final String lang) {
259 final String resName = String.format("org/apache/commons/codec/language/bm/%s.txt", lang);
260 return new Scanner(Resources.getInputStream(resName), ResourceConstants.ENCODING);
261 }
262
263 private static boolean endsWith(final CharSequence input, final CharSequence suffix) {
264 final int suffixLength = suffix.length();
265 final int inputLength = input.length();
266
267 if (suffixLength > inputLength) {
268 return false;
269 }
270 for (int i = inputLength - 1, j = suffixLength - 1; j >= 0; i--, j--) {
271 if (input.charAt(i) != suffix.charAt(j)) {
272 return false;
273 }
274 }
275 return true;
276 }
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289 public static List<Rule> getInstance(final NameType nameType, final RuleType rt,
290 final Languages.LanguageSet langs) {
291 final Map<String, List<Rule>> ruleMap = getInstanceMap(nameType, rt, langs);
292 final List<Rule> allRules = new ArrayList<>();
293 ruleMap.values().forEach(rules -> allRules.addAll(rules));
294 return allRules;
295 }
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308 public static List<Rule> getInstance(final NameType nameType, final RuleType rt, final String lang) {
309 return getInstance(nameType, rt, LanguageSet.from(new HashSet<>(Arrays.asList(lang))));
310 }
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324 public static Map<String, List<Rule>> getInstanceMap(final NameType nameType, final RuleType rt,
325 final Languages.LanguageSet langs) {
326 return langs.isSingleton() ? getInstanceMap(nameType, rt, langs.getAny()) :
327 getInstanceMap(nameType, rt, Languages.ANY);
328 }
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342 public static Map<String, List<Rule>> getInstanceMap(final NameType nameType, final RuleType rt,
343 final String lang) {
344 final Map<String, List<Rule>> rules = RULES.get(nameType).get(rt).get(lang);
345
346 if (rules == null) {
347 throw new IllegalArgumentException(String.format("No rules found for %s, %s, %s.",
348 nameType.getName(), rt.getName(), lang));
349 }
350
351 return rules;
352 }
353
354 private static Phoneme parsePhoneme(final String ph) {
355 final int open = ph.indexOf("[");
356 if (open >= 0) {
357 if (!ph.endsWith("]")) {
358 throw new IllegalArgumentException("Phoneme expression contains a '[' but does not end in ']'");
359 }
360 final String before = ph.substring(0, open);
361 final String in = ph.substring(open + 1, ph.length() - 1);
362 final Set<String> langs = new HashSet<>(Arrays.asList(in.split("[+]")));
363
364 return new Phoneme(before, Languages.LanguageSet.from(langs));
365 }
366 return new Phoneme(ph, Languages.ANY_LANGUAGE);
367 }
368
369 private static PhonemeExpr parsePhonemeExpr(final String ph) {
370 if (ph.startsWith("(")) {
371 if (!ph.endsWith(")")) {
372 throw new IllegalArgumentException("Phoneme starts with '(' so must end with ')'");
373 }
374
375 final List<Phoneme> phs = new ArrayList<>();
376 final String body = ph.substring(1, ph.length() - 1);
377 for (final String part : body.split("[|]")) {
378 phs.add(parsePhoneme(part));
379 }
380 if (body.startsWith("|") || body.endsWith("|")) {
381 phs.add(new Phoneme("", Languages.ANY_LANGUAGE));
382 }
383
384 return new PhonemeList(phs);
385 }
386 return parsePhoneme(ph);
387 }
388
389 private static Map<String, List<Rule>> parseRules(final Scanner scanner, final String location) {
390 final Map<String, List<Rule>> lines = new HashMap<>();
391 int currentLine = 0;
392
393 boolean inMultilineComment = false;
394 while (scanner.hasNextLine()) {
395 currentLine++;
396 final String rawLine = scanner.nextLine();
397 String line = rawLine;
398
399 if (inMultilineComment) {
400 if (line.endsWith(ResourceConstants.EXT_CMT_END)) {
401 inMultilineComment = false;
402 }
403 } else if (line.startsWith(ResourceConstants.EXT_CMT_START)) {
404 inMultilineComment = true;
405 } else {
406
407 final int cmtI = line.indexOf(ResourceConstants.CMT);
408 if (cmtI >= 0) {
409 line = line.substring(0, cmtI);
410 }
411
412
413 line = line.trim();
414
415 if (line.isEmpty()) {
416 continue;
417 }
418
419 if (line.startsWith(HASH_INCLUDE)) {
420
421 final String incl = line.substring(HASH_INCLUDE_LENGTH).trim();
422 if (incl.contains(" ")) {
423 throw new IllegalArgumentException("Malformed import statement '" + rawLine + "' in " +
424 location);
425 }
426 try (final Scanner hashIncludeScanner = createScanner(incl)) {
427 lines.putAll(parseRules(hashIncludeScanner, location + "->" + incl));
428 }
429 } else {
430
431 final String[] parts = line.split("\\s+");
432 if (parts.length != 4) {
433 throw new IllegalArgumentException("Malformed rule statement split into " + parts.length +
434 " parts: " + rawLine + " in " + location);
435 }
436 try {
437 final String pat = stripQuotes(parts[0]);
438 final String lCon = stripQuotes(parts[1]);
439 final String rCon = stripQuotes(parts[2]);
440 final PhonemeExpr ph = parsePhonemeExpr(stripQuotes(parts[3]));
441 final int cLine = currentLine;
442 final Rule r = new Rule(pat, lCon, rCon, ph) {
443 private final int myLine = cLine;
444 private final String loc = location;
445
446 @Override
447 public String toString() {
448 final StringBuilder sb = new StringBuilder();
449 sb.append("Rule");
450 sb.append("{line=").append(myLine);
451 sb.append(", loc='").append(loc).append('\'');
452 sb.append(", pat='").append(pat).append('\'');
453 sb.append(", lcon='").append(lCon).append('\'');
454 sb.append(", rcon='").append(rCon).append('\'');
455 sb.append('}');
456 return sb.toString();
457 }
458 };
459 final String patternKey = r.pattern.substring(0, 1);
460 final List<Rule> rules = lines.computeIfAbsent(patternKey, k -> new ArrayList<>());
461 rules.add(r);
462 } catch (final IllegalArgumentException e) {
463 throw new IllegalStateException("Problem parsing line '" + currentLine + "' in " +
464 location, e);
465 }
466 }
467 }
468 }
469
470 return lines;
471 }
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480 private static RPattern pattern(final String regex) {
481 final boolean startsWith = regex.startsWith("^");
482 final boolean endsWith = regex.endsWith("$");
483 final String content = regex.substring(startsWith ? 1 : 0, endsWith ? regex.length() - 1 : regex.length());
484 final boolean boxes = content.contains("[");
485
486 if (!boxes) {
487 if (startsWith && endsWith) {
488
489 if (content.isEmpty()) {
490
491 return input -> input.length() == 0;
492 }
493 return input -> input.equals(content);
494 }
495 if ((startsWith || endsWith) && content.isEmpty()) {
496
497 return ALL_STRINGS_RMATCHER;
498 }
499 if (startsWith) {
500
501 return input -> startsWith(input, content);
502 }
503 if (endsWith) {
504
505 return input -> endsWith(input, content);
506 }
507 } else {
508 final boolean startsWithBox = content.startsWith("[");
509 final boolean endsWithBox = content.endsWith("]");
510
511 if (startsWithBox && endsWithBox) {
512 String boxContent = content.substring(1, content.length() - 1);
513 if (!boxContent.contains("[")) {
514
515 final boolean negate = boxContent.startsWith("^");
516 if (negate) {
517 boxContent = boxContent.substring(1);
518 }
519 final String bContent = boxContent;
520 final boolean shouldMatch = !negate;
521
522 if (startsWith && endsWith) {
523
524 return input -> input.length() == 1 && contains(bContent, input.charAt(0)) == shouldMatch;
525 }
526 if (startsWith) {
527
528 return input -> input.length() > 0 && contains(bContent, input.charAt(0)) == shouldMatch;
529 }
530 if (endsWith) {
531
532 return input -> input.length() > 0 &&
533 contains(bContent, input.charAt(input.length() - 1)) == shouldMatch;
534 }
535 }
536 }
537 }
538
539 return new RPattern() {
540 final Pattern pattern = Pattern.compile(regex);
541
542 @Override
543 public boolean isMatch(final CharSequence input) {
544 final Matcher matcher = pattern.matcher(input);
545 return matcher.find();
546 }
547 };
548 }
549
550 private static boolean startsWith(final CharSequence input, final CharSequence prefix) {
551 if (prefix.length() > input.length()) {
552 return false;
553 }
554 for (int i = 0; i < prefix.length(); i++) {
555 if (input.charAt(i) != prefix.charAt(i)) {
556 return false;
557 }
558 }
559 return true;
560 }
561
562 private static String stripQuotes(String str) {
563 if (str.startsWith(DOUBLE_QUOTE)) {
564 str = str.substring(1);
565 }
566
567 if (str.endsWith(DOUBLE_QUOTE)) {
568 str = str.substring(0, str.length() - 1);
569 }
570
571 return str;
572 }
573
574 private final RPattern lContext;
575
576 private final String pattern;
577
578 private final PhonemeExpr phoneme;
579
580 private final RPattern rContext;
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594 public Rule(final String pattern, final String lContext, final String rContext, final PhonemeExpr phoneme) {
595 this.pattern = pattern;
596 this.lContext = pattern(lContext + "$");
597 this.rContext = pattern("^" + rContext);
598 this.phoneme = phoneme;
599 }
600
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606 public RPattern getLContext() {
607 return this.lContext;
608 }
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615 public String getPattern() {
616 return this.pattern;
617 }
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623
624 public PhonemeExpr getPhoneme() {
625 return this.phoneme;
626 }
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633 public RPattern getRContext() {
634 return this.rContext;
635 }
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648 public boolean patternAndContextMatches(final CharSequence input, final int i) {
649 if (i < 0) {
650 throw new IndexOutOfBoundsException("Can not match pattern at negative indexes");
651 }
652
653 final int patternLength = this.pattern.length();
654 final int ipl = i + patternLength;
655
656 if (ipl > input.length()) {
657
658 return false;
659 }
660
661
662
663 if (!input.subSequence(i, ipl).equals(this.pattern)) {
664 return false;
665 }
666 if (!this.rContext.isMatch(input.subSequence(ipl, input.length()))) {
667 return false;
668 }
669 return this.lContext.isMatch(input.subSequence(0, i));
670 }
671 }