add ability to prefix replacement with matched text

vor 4 Jahren · 565b0e251a
--- a/src/main/java/org/cobbzilla/util/io/regex/RegexReplacementFilter.java
+++ b/src/main/java/org/cobbzilla/util/io/regex/RegexReplacementFilter.java
@@ -11,9 +11,12 @@ import java.util.regex.Pattern;
@NoArgsConstructor
 public class RegexReplacementFilter implements RegexStreamFilter {

    public static final String DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH = "!";

    @Getter @Setter private Pattern pattern;
    @Getter @Setter private int group;
    @Getter @Setter private String replacement;
    @Getter @Setter private String prefixReplacementWithMatch = DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH;

    public RegexReplacementFilter(String regex, int group, String replacement) {
        this.pattern = Pattern.compile(regex);
@@ -45,8 +48,14 @@ public class RegexReplacementFilter implements RegexStreamFilter {
            // add everything before the group match
            result.append(buffer.subSequence(matcher.start(), matcher.start(group)));

            // add the replacement
            result.append(replacement);
            // if the replacement starts with the special prefixReplacementWithMatch, insert the match before the replacement
            if (replacement.startsWith(prefixReplacementWithMatch)) {
                result.append(buffer.subSequence(matcher.start(group), matcher.end(group)));
                result.append(replacement.substring(prefixReplacementWithMatch.length()));
            } else {
                // add the replacement
                result.append(replacement);
            }

            // add everything after the group match
            result.append(buffer.subSequence(matcher.end(group), matcher.end()));
--- a/src/test/java/org/cobbzilla/util/io/regex/RegexFilterReaderTest.java
+++ b/src/test/java/org/cobbzilla/util/io/regex/RegexFilterReaderTest.java
@@ -38,6 +38,18 @@ public class RegexFilterReaderTest {
        assertEquals("multi reader failed to get expected output", EXPECTED_STRING, result.toString());
    }

    public static final String TEST_STRING_INCLUDE_MATCH = "<!DOCTYPE html>\n<html dir=\"ltr\" lang=\"en\">\n<meta charset=\"utf-8\">something</html>\n";
    public static final String EXPECTED_STRING_INCLUDE_MATCH = "<!DOCTYPE html>\n<html dir=\"ltr\" lang=\"en\">INSERTED_DATA\n<meta charset=\"utf-8\">something</html>\n";

    @Test public void testRegexReaderIncludeMatch() throws Exception {
        final Reader reader = new StringReader(TEST_STRING_INCLUDE_MATCH);
        final RegexStreamFilter regexStreamFilter = new RegexReplacementFilter("<html\\s+[^>]*>", "!INSERTED_DATA");
        final RegexFilterReader regexFilterReader = new RegexFilterReader(reader, 1024, regexStreamFilter);
        final StringWriter result = new StringWriter();
        IOUtils.copyLarge(regexFilterReader, result);
        assertEquals("multi reader failed to get expected output", EXPECTED_STRING_INCLUDE_MATCH, result.toString());
    }

    public static final String MULTI_TEST_STRING_1 = "this is a multi-stream test string\nthat should has a lot of stuff";
    public static final String MULTI_TEST_STRING_2 = "in it but why should that matter?\nit is a bad thing to have multiple streams?";
    public static final String MULTI_TEST_STRING_3 = "maybe some people think so\nbut a good person would never say that";