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/*
* 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 bjc.inflexion;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* General utils for dealing with english.
*
* @author student
*/
public class EnglishUtils {
/**
* Pick an indefinite article ('a' or 'an') for a phrase.
*
* @param phrase
* The phrase to pick an article for.
* @return The article to use for the phrase.
*/
public static String pickIndefinite(String phrase) {
Pattern pattern;
Matcher matcher;
String word, lowercaseWord;
if (phrase.length() == 0) {
return "a";
}
// Getting the first word
pattern = Pattern.compile("(\\w+)\\s*.*");
matcher = pattern.matcher(phrase);
if (matcher.matches() == true) {
word = matcher.group(1);
} else {
return "an";
}
lowercaseWord = word.toLowerCase();
// Specific start of words that should be preceded by 'an'
String[] altCases = {
"euler", "heir", "honest", "hono"
};
for (String altCase : altCases) {
if (lowercaseWord.startsWith(altCase) == true) {
return "an";
}
}
if (lowercaseWord.startsWith("hour") == true
&& lowercaseWord.startsWith("houri") == false) {
return "an";
}
// Single letter word which should be preceded by 'an'
if (lowercaseWord.length() == 1) {
if ("aedhilmnorsx".indexOf(lowercaseWord) >= 0) {
return "an";
}
return "a";
}
// Capital words which should likely be preceded by 'an'
if (word.matches(
"(?!FJO|[HLMNS]Y.|RY[EO]|SQU|(F[LR]?|[HL]|MN?|N|RH?|S[CHKLMNPTVW]?|X(YL)?)[AEIOU])[FHLMNRSX][A-Z]")) {
return "an";
}
// Special cases where a word that begins with a vowel should be preceded by 'a'
String[] regexes = {
"^e[uw]", "^onc?e\\b", "^uni([^nmd]|mo)", "^u[bcfhjkqrst][aeiou]"
};
for (String regex : regexes) {
if (lowercaseWord.matches(regex + ".*") == true) {
return "a";
}
}
// Special capital words (UK, UN)
if (word.matches("^U[NK][AIEO].*") == true) {
return "a";
} else if (word.equals(word.toUpperCase())) {
if ("aedhilmnorsx".indexOf(lowercaseWord.substring(0, 1)) >= 0) {
return "an";
}
return "a";
}
// Basic method of words that begin with a vowel being preceded by 'an'
if ("aeiou".indexOf(lowercaseWord.substring(0, 1)) >= 0) {
return "an";
}
// Instances where y followed by specific letters is preceded by 'an'
if (lowercaseWord.matches("^y(b[lor]|cl[ea]|fere|gg|p[ios]|rou|tt).*")) {
return "an";
}
return "a";
}
}
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