001/* 002 * Portions of this software was developed by employees of the National Institute 003 * of Standards and Technology (NIST), an agency of the Federal Government and is 004 * being made available as a public service. Pursuant to title 17 United States 005 * Code Section 105, works of NIST employees are not subject to copyright 006 * protection in the United States. This software may be subject to foreign 007 * copyright. Permission in the United States and in foreign countries, to the 008 * extent that NIST may hold copyright, to use, copy, modify, create derivative 009 * works, and distribute this software and its documentation without fee is hereby 010 * granted on a non-exclusive basis, provided that this notice and disclaimer 011 * of warranty appears in all copies. 012 * 013 * THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER 014 * EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY WARRANTY 015 * THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED WARRANTIES OF 016 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND FREEDOM FROM 017 * INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL CONFORM TO THE 018 * SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR FREE. IN NO EVENT 019 * SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, DIRECT, 020 * INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT OF, RESULTING FROM, 021 * OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR NOT BASED UPON WARRANTY, 022 * CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT INJURY WAS SUSTAINED BY PERSONS OR 023 * PROPERTY OR OTHERWISE, AND WHETHER OR NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT 024 * OF THE RESULTS OF, OR USE OF, THE SOFTWARE OR SERVICES PROVIDED HEREUNDER. 025 */ 026 027package gov.nist.secauto.metaschema.core.util; 028 029import java.util.function.Function; 030import java.util.regex.Matcher; 031import java.util.regex.Pattern; 032 033import edu.umd.cs.findbugs.annotations.NonNull; 034 035public final class ReplacementScanner { 036 private ReplacementScanner() { 037 // disable construction 038 } 039 040 /** 041 * Search for instances of {@code pattern} in {@code text}. Replace each 042 * matching occurrence using the {@code replacementFunction}. 043 * 044 * @param text 045 * the text to search 046 * @param pattern 047 * the pattern to search for 048 * @param replacementFunction 049 * a function that will provided the replacement text 050 * @return the resulting text after replacing matching occurrences in 051 * {@code text} 052 */ 053 public static CharSequence replaceTokens(@NonNull CharSequence text, @NonNull Pattern pattern, 054 Function<Matcher, CharSequence> replacementFunction) { 055 int lastIndex = 0; 056 StringBuilder retval = new StringBuilder(); 057 Matcher matcher = pattern.matcher(text); 058 while (matcher.find()) { 059 retval.append(text, lastIndex, matcher.start()) 060 .append(replacementFunction.apply(matcher)); 061 062 lastIndex = matcher.end(); 063 } 064 if (lastIndex < text.length()) { 065 retval.append(text, lastIndex, text.length()); 066 } 067 return retval; 068 } 069}