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IndefiniteArticle.java
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114 lines (95 loc) · 3.58 KB
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/*
* IndefiniteArticle.java v1.0.0, 20/1/2012
*
* @author: Philip Manavopoulos (@manavo)
*
* (The MIT License)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.manavo.libraries;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IndefiniteArticle {
public static String get(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";
} else {
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 == word.toUpperCase()) {
if ("aedhilmnorsx".indexOf(lowercaseWord.substring(0, 1)) >= 0) {
return "an";
} else {
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";
}
}