package android.os;
+import android.util.Log;
+
+import java.util.Arrays;
+
/**
* A simple pattern matcher, which is safe to use on untrusted data: it does
* not provide full reg-exp support, only simple globbing that can not be
* wildcard part of a normal regexp.
*/
public static final int PATTERN_SIMPLE_GLOB = 2;
-
+
+ /**
+ * Pattern type: the given pattern is interpreted with a regular
+ * expression-like syntax for matching against the string it is tested
+ * against. Supported tokens include dot ({@code .}) and sets ({@code [...]})
+ * with full support for character ranges and the not ({@code ^}) modifier.
+ * Supported modifiers include star ({@code *}) for zero-or-more, plus ({@code +})
+ * for one-or-more and full range ({@code {...}}) support. This is a simple
+ * evaulation implementation in which matching is done against the pattern in
+ * realtime with no backtracking support.
+ *
+ * {@hide} Pending approval for public API
+ */
+ public static final int PATTERN_ADVANCED_GLOB = 3;
+
+ // token types for advanced matching
+ private static final int TOKEN_TYPE_LITERAL = 0;
+ private static final int TOKEN_TYPE_ANY = 1;
+ private static final int TOKEN_TYPE_SET = 2;
+ private static final int TOKEN_TYPE_INVERSE_SET = 3;
+
+ // Return for no match
+ private static final int NO_MATCH = -1;
+
+ private static final String TAG = "PatternMatcher";
+
+ // Parsed placeholders for advanced patterns
+ private static final int PARSED_TOKEN_CHAR_SET_START = -1;
+ private static final int PARSED_TOKEN_CHAR_SET_INVERSE_START = -2;
+ private static final int PARSED_TOKEN_CHAR_SET_STOP = -3;
+ private static final int PARSED_TOKEN_CHAR_ANY = -4;
+ private static final int PARSED_MODIFIER_RANGE_START = -5;
+ private static final int PARSED_MODIFIER_RANGE_STOP = -6;
+ private static final int PARSED_MODIFIER_ZERO_OR_MORE = -7;
+ private static final int PARSED_MODIFIER_ONE_OR_MORE = -8;
+
private final String mPattern;
private final int mType;
-
+ private final int[] mParsedPattern;
+
+
+ private static final int MAX_PATTERN_STORAGE = 2048;
+ // workspace to use for building a parsed advanced pattern;
+ private static final int[] sParsedPatternScratch = new int[MAX_PATTERN_STORAGE];
+
public PatternMatcher(String pattern, int type) {
mPattern = pattern;
mType = type;
+ if (mType == PATTERN_ADVANCED_GLOB) {
+ mParsedPattern = parseAndVerifyAdvancedPattern(pattern);
+ } else {
+ mParsedPattern = null;
+ }
}
public final String getPath() {
}
public boolean match(String str) {
- return matchPattern(mPattern, str, mType);
+ return matchPattern(str, mPattern, mParsedPattern, mType);
}
public String toString() {
case PATTERN_SIMPLE_GLOB:
type = "GLOB: ";
break;
+ case PATTERN_ADVANCED_GLOB:
+ type = "ADVANCED: ";
+ break;
}
return "PatternMatcher{" + type + mPattern + "}";
}
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(mPattern);
dest.writeInt(mType);
+ dest.writeIntArray(mParsedPattern);
}
public PatternMatcher(Parcel src) {
mPattern = src.readString();
mType = src.readInt();
+ mParsedPattern = src.createIntArray();
}
public static final Parcelable.Creator<PatternMatcher> CREATOR
}
};
- static boolean matchPattern(String pattern, String match, int type) {
+ static boolean matchPattern(String match, String pattern, int[] parsedPattern, int type) {
if (match == null) return false;
if (type == PATTERN_LITERAL) {
return pattern.equals(match);
} if (type == PATTERN_PREFIX) {
return match.startsWith(pattern);
- } else if (type != PATTERN_SIMPLE_GLOB) {
- return false;
+ } else if (type == PATTERN_SIMPLE_GLOB) {
+ return matchGlobPattern(pattern, match);
+ } else if (type == PATTERN_ADVANCED_GLOB) {
+ return matchAdvancedPattern(parsedPattern, match);
}
-
+ return false;
+ }
+
+ static boolean matchGlobPattern(String pattern, String match) {
final int NP = pattern.length();
if (NP <= 0) {
return match.length() <= 0;
return false;
}
-}
+
+ /**
+ * Parses the advanced pattern and returns an integer array representation of it. The integer
+ * array treats each field as a character if positive and a unique token placeholder if
+ * negative. This method will throw on any pattern structure violations.
+ */
+ synchronized static int[] parseAndVerifyAdvancedPattern(String pattern) {
+ int ip = 0;
+ final int LP = pattern.length();
+
+ int it = 0;
+
+ boolean inSet = false;
+ boolean inRange = false;
+ boolean inCharClass = false;
+
+ boolean addToParsedPattern;
+
+ while (ip < LP) {
+ if (it > MAX_PATTERN_STORAGE - 3) {
+ throw new IllegalArgumentException("Pattern is too large!");
+ }
+
+ char c = pattern.charAt(ip);
+ addToParsedPattern = false;
+
+ switch (c) {
+ case '[':
+ if (inSet) {
+ addToParsedPattern = true; // treat as literal or char class in set
+ } else {
+ if (pattern.charAt(ip + 1) == '^') {
+ sParsedPatternScratch[it++] = PARSED_TOKEN_CHAR_SET_INVERSE_START;
+ ip++; // skip over the '^'
+ } else {
+ sParsedPatternScratch[it++] = PARSED_TOKEN_CHAR_SET_START;
+ }
+ ip++; // move to the next pattern char
+ inSet = true;
+ continue;
+ }
+ break;
+ case ']':
+ if (!inSet) {
+ addToParsedPattern = true; // treat as literal outside of set
+ } else {
+ int parsedToken = sParsedPatternScratch[it - 1];
+ if (parsedToken == PARSED_TOKEN_CHAR_SET_START ||
+ parsedToken == PARSED_TOKEN_CHAR_SET_INVERSE_START) {
+ throw new IllegalArgumentException(
+ "You must define characters in a set.");
+ }
+ sParsedPatternScratch[it++] = PARSED_TOKEN_CHAR_SET_STOP;
+ inSet = false;
+ inCharClass = false;
+ }
+ break;
+ case '{':
+ if (!inSet) {
+ if (it == 0 || isParsedModifier(sParsedPatternScratch[it - 1])) {
+ throw new IllegalArgumentException("Modifier must follow a token.");
+ }
+ sParsedPatternScratch[it++] = PARSED_MODIFIER_RANGE_START;
+ ip++;
+ inRange = true;
+ }
+ break;
+ case '}':
+ if (inRange) { // only terminate the range if we're currently in one
+ sParsedPatternScratch[it++] = PARSED_MODIFIER_RANGE_STOP;
+ inRange = false;
+ }
+ break;
+ case '*':
+ if (!inSet) {
+ if (it == 0 || isParsedModifier(sParsedPatternScratch[it - 1])) {
+ throw new IllegalArgumentException("Modifier must follow a token.");
+ }
+ sParsedPatternScratch[it++] = PARSED_MODIFIER_ZERO_OR_MORE;
+ }
+ break;
+ case '+':
+ if (!inSet) {
+ if (it == 0 || isParsedModifier(sParsedPatternScratch[it - 1])) {
+ throw new IllegalArgumentException("Modifier must follow a token.");
+ }
+ sParsedPatternScratch[it++] = PARSED_MODIFIER_ONE_OR_MORE;
+ }
+ break;
+ case '.':
+ if (!inSet) {
+ sParsedPatternScratch[it++] = PARSED_TOKEN_CHAR_ANY;
+ }
+ break;
+ case '\\': // escape
+ if (ip + 1 >= LP) {
+ throw new IllegalArgumentException("Escape found at end of pattern!");
+ }
+ c = pattern.charAt(++ip);
+ addToParsedPattern = true;
+ break;
+ default:
+ addToParsedPattern = true;
+ break;
+ }
+ if (inSet) {
+ if (inCharClass) {
+ sParsedPatternScratch[it++] = c;
+ inCharClass = false;
+ } else {
+ // look forward for character class
+ if (ip + 2 < LP
+ && pattern.charAt(ip + 1) == '-'
+ && pattern.charAt(ip + 2) != ']') {
+ inCharClass = true;
+ sParsedPatternScratch[it++] = c; // set first token as lower end of range
+ ip++; // advance past dash
+ } else { // literal
+ sParsedPatternScratch[it++] = c; // set first token as literal
+ sParsedPatternScratch[it++] = c; // set second set as literal
+ }
+ }
+ } else if (inRange) {
+ int endOfSet = pattern.indexOf('}', ip);
+ if (endOfSet < 0) {
+ throw new IllegalArgumentException("Range not ended with '}'");
+ }
+ String rangeString = pattern.substring(ip, endOfSet);
+ int commaIndex = rangeString.indexOf(',');
+ try {
+ final int rangeMin;
+ final int rangeMax;
+ if (commaIndex < 0) {
+ int parsedRange = Integer.parseInt(rangeString);
+ rangeMin = rangeMax = parsedRange;
+ } else {
+ rangeMin = Integer.parseInt(rangeString.substring(0, commaIndex));
+ if (commaIndex == rangeString.length() - 1) { // e.g. {n,} (n or more)
+ rangeMax = Integer.MAX_VALUE;
+ } else {
+ rangeMax = Integer.parseInt(rangeString.substring(commaIndex + 1));
+ }
+ }
+ if (rangeMin > rangeMax) {
+ throw new IllegalArgumentException(
+ "Range quantifier minimum is greater than maximum");
+ }
+ sParsedPatternScratch[it++] = rangeMin;
+ sParsedPatternScratch[it++] = rangeMax;
+ } catch (NumberFormatException e) {
+ throw new IllegalArgumentException("Range number format incorrect", e);
+ }
+ ip = endOfSet;
+ continue; // don't increment ip
+ } else if (addToParsedPattern) {
+ sParsedPatternScratch[it++] = c;
+ }
+ ip++;
+ }
+ if (inSet) {
+ throw new IllegalArgumentException("Set was not terminated!");
+ }
+ return Arrays.copyOf(sParsedPatternScratch, it);
+ }
+
+ private static boolean isParsedModifier(int parsedChar) {
+ return parsedChar == PARSED_MODIFIER_ONE_OR_MORE ||
+ parsedChar == PARSED_MODIFIER_ZERO_OR_MORE ||
+ parsedChar == PARSED_MODIFIER_RANGE_STOP ||
+ parsedChar == PARSED_MODIFIER_RANGE_START;
+ }
+
+ static boolean matchAdvancedPattern(int[] parsedPattern, String match) {
+
+ // create indexes
+ int ip = 0, im = 0;
+
+ // one-time length check
+ final int LP = parsedPattern.length, LM = match.length();
+
+ // The current character being analyzed in the pattern
+ int patternChar;
+
+ int tokenType;
+
+ int charSetStart = 0, charSetEnd = 0;
+
+ while (ip < LP) { // we still have content in the pattern
+
+ patternChar = parsedPattern[ip];
+ // get the match type of the next verb
+
+ switch (patternChar) {
+ case PARSED_TOKEN_CHAR_ANY:
+ tokenType = TOKEN_TYPE_ANY;
+ ip++;
+ break;
+ case PARSED_TOKEN_CHAR_SET_START:
+ case PARSED_TOKEN_CHAR_SET_INVERSE_START:
+ tokenType = patternChar == PARSED_TOKEN_CHAR_SET_START
+ ? TOKEN_TYPE_SET
+ : TOKEN_TYPE_INVERSE_SET;
+ charSetStart = ip + 1; // start from the char after the set start
+ while (++ip < LP && parsedPattern[ip] != PARSED_TOKEN_CHAR_SET_STOP);
+ charSetEnd = ip - 1; // we're on the set stop, end is the previous
+ ip++; // move the pointer to the next pattern entry
+ break;
+ default:
+ charSetStart = ip;
+ tokenType = TOKEN_TYPE_LITERAL;
+ ip++;
+ break;
+ }
+
+ final int minRepetition;
+ final int maxRepetition;
+
+ // look for a match length modifier
+ if (ip >= LP) {
+ minRepetition = maxRepetition = 1;
+ } else {
+ patternChar = parsedPattern[ip];
+ switch (patternChar) {
+ case PARSED_MODIFIER_ZERO_OR_MORE:
+ minRepetition = 0;
+ maxRepetition = Integer.MAX_VALUE;
+ ip++;
+ break;
+ case PARSED_MODIFIER_ONE_OR_MORE:
+ minRepetition = 1;
+ maxRepetition = Integer.MAX_VALUE;
+ ip++;
+ break;
+ case PARSED_MODIFIER_RANGE_START:
+ minRepetition = parsedPattern[++ip];
+ maxRepetition = parsedPattern[++ip];
+ ip += 2; // step over PARSED_MODIFIER_RANGE_STOP and on to the next token
+ break;
+ default:
+ minRepetition = maxRepetition = 1; // implied literal
+ break;
+ }
+ }
+ if (minRepetition > maxRepetition) {
+ return false;
+ }
+
+ // attempt to match as many characters as possible
+ int matched = matchChars(match, im, LM, tokenType, minRepetition, maxRepetition,
+ parsedPattern, charSetStart, charSetEnd);
+
+ // if we found a conflict, return false immediately
+ if (matched == NO_MATCH) {
+ return false;
+ }
+
+ // move the match pointer the number of characters matched
+ im += matched;
+ }
+ return ip >= LP && im >= LM; // have parsed entire string and regex
+ }
+
+ private static int matchChars(String match, int im, final int lm, int tokenType,
+ int minRepetition, int maxRepetition, int[] parsedPattern,
+ int tokenStart, int tokenEnd) {
+ int matched = 0;
+
+ while(matched < maxRepetition
+ && matchChar(match, im + matched, lm, tokenType, parsedPattern, tokenStart,
+ tokenEnd)) {
+ matched++;
+ }
+
+ return matched < minRepetition ? NO_MATCH : matched;
+ }
+
+ private static boolean matchChar(String match, int im, final int lm, int tokenType,
+ int[] parsedPattern, int tokenStart, int tokenEnd) {
+ if (im >= lm) { // we've overrun the string, no match
+ return false;
+ }
+ switch (tokenType) {
+ case TOKEN_TYPE_ANY:
+ return true;
+ case TOKEN_TYPE_SET:
+ for (int i = tokenStart; i < tokenEnd; i += 2) {
+ char matchChar = match.charAt(im);
+ if (matchChar >= parsedPattern[i] && matchChar <= parsedPattern[i + 1]) {
+ return true;
+ }
+ }
+ return false;
+ case TOKEN_TYPE_INVERSE_SET:
+ for (int i = tokenStart; i < tokenEnd; i += 2) {
+ char matchChar = match.charAt(im);
+ if (matchChar >= parsedPattern[i] && matchChar <= parsedPattern[i + 1]) {
+ return false;
+ }
+ }
+ return true;
+ case TOKEN_TYPE_LITERAL:
+ return match.charAt(im) == parsedPattern[tokenStart];
+ default:
+ return false;
+ }
+ }
+}
\ No newline at end of file
--- /dev/null
+package android.os;
+
+import android.test.suitebuilder.annotation.SmallTest;
+import junit.framework.TestCase;
+import org.junit.runner.RunWith;
+import org.junit.Test;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+@SmallTest
+public class PatternMatcherTest extends TestCase{
+
+ @Test
+ public void testAdvancedPatternMatchesAnyToken() {
+ PatternMatcher matcher = new PatternMatcher(".", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertMatches("b", matcher);
+ assertNotMatches("", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesSetToken() {
+ PatternMatcher matcher = new PatternMatcher("[a]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertNotMatches("b", matcher);
+
+ matcher = new PatternMatcher("[.*+{}\\]\\\\[]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches(".", matcher);
+ assertMatches("*", matcher);
+ assertMatches("+", matcher);
+ assertMatches("{", matcher);
+ assertMatches("}", matcher);
+ assertMatches("]", matcher);
+ assertMatches("\\", matcher);
+ assertMatches("[", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesSetCharacterClassToken() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertMatches("b", matcher);
+ assertNotMatches("A", matcher);
+ assertNotMatches("1", matcher);
+
+ matcher = new PatternMatcher("[a-z][0-9]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a1", matcher);
+ assertNotMatches("1a", matcher);
+ assertNotMatches("aa", matcher);
+
+ matcher = new PatternMatcher("[z-a]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertNotMatches("a", matcher);
+ assertNotMatches("z", matcher);
+ assertNotMatches("A", matcher);
+
+ matcher = new PatternMatcher("[^0-9]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertMatches("z", matcher);
+ assertMatches("A", matcher);
+ assertNotMatches("9", matcher);
+ assertNotMatches("5", matcher);
+ assertNotMatches("0", matcher);
+
+ assertPoorlyFormattedPattern("[]a]");
+ matcher = new PatternMatcher("[\\[a]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertMatches("[", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesEscapedCharacters() {
+ PatternMatcher matcher = new PatternMatcher("\\.", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches(".", matcher);
+ assertNotMatches("a", matcher);
+ assertNotMatches("1", matcher);
+
+ matcher = new PatternMatcher("a\\+", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a+", matcher);
+ assertNotMatches("a", matcher);
+ assertNotMatches("aaaaa", matcher);
+
+ matcher = new PatternMatcher("[\\a-\\z]", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertMatches("a", matcher);
+ assertMatches("z", matcher);
+ assertNotMatches("A", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesLiteralTokens() {
+ PatternMatcher matcher = new PatternMatcher("a", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertNotMatches("", matcher);
+ assertMatches("a", matcher);
+ assertNotMatches("z", matcher);
+
+ matcher = new PatternMatcher("az", PatternMatcher.PATTERN_ADVANCED_GLOB);
+ assertNotMatches("", matcher);
+ assertMatches("az", matcher);
+ assertNotMatches("za", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesSetZeroOrMore() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]*", PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertMatches("", matcher);
+ assertMatches("a", matcher);
+ assertMatches("abcdefg", matcher);
+ assertNotMatches("abc1", matcher);
+ assertNotMatches("1abc", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesSetOneOrMore() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]+", PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertNotMatches("", matcher);
+ assertMatches("a", matcher);
+ assertMatches("abcdefg", matcher);
+ assertNotMatches("abc1", matcher);
+ assertNotMatches("1abc", matcher);
+ }
+
+
+ @Test
+ public void testAdvancedPatternMatchesSingleRange() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]{1}",
+ PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertNotMatches("", matcher);
+ assertMatches("a", matcher);
+ assertMatches("z", matcher);
+ assertNotMatches("1", matcher);
+ assertNotMatches("aa", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesFullRange() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]{1,5}",
+ PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertNotMatches("", matcher);
+ assertMatches("a", matcher);
+ assertMatches("zazaz", matcher);
+ assertNotMatches("azazaz", matcher);
+ assertNotMatches("11111", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesPartialRange() {
+ PatternMatcher matcher = new PatternMatcher("[a-z]{3,}",
+ PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertNotMatches("", matcher);
+ assertMatches("aza", matcher);
+ assertMatches("zazaz", matcher);
+ assertMatches("azazazazazaz", matcher);
+ assertNotMatches("aa", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternMatchesComplexPatterns() {
+ PatternMatcher matcher = new PatternMatcher(
+ "/[0-9]{4}/[0-9]{2}/[0-9]{2}/[a-zA-Z0-9_]+\\.html",
+ PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertNotMatches("", matcher);
+ assertMatches("/2016/09/07/got_this_working.html", matcher);
+ assertMatches("/2016/09/07/got_this_working2.html", matcher);
+ assertNotMatches("/2016/09/07/got_this_working2dothtml", matcher);
+ assertNotMatches("/2016/9/7/got_this_working.html", matcher);
+
+ matcher = new PatternMatcher(
+ "/b*a*bar.*",
+ PatternMatcher.PATTERN_ADVANCED_GLOB);
+
+ assertMatches("/babar", matcher);
+ assertMatches("/babarfff", matcher);
+ assertMatches("/bbaabarfff", matcher);
+ assertMatches("/babar?blah", matcher);
+ assertMatches("/baaaabar?blah", matcher);
+ assertNotMatches("?bar", matcher);
+ assertNotMatches("/bar", matcher);
+ assertNotMatches("/baz", matcher);
+ assertNotMatches("/ba/bar", matcher);
+ assertNotMatches("/barf", matcher);
+ assertNotMatches("/", matcher);
+ assertNotMatches("?blah", matcher);
+ }
+
+ @Test
+ public void testAdvancedPatternPoorFormatThrowsIllegalArgumentException() {
+ assertPoorlyFormattedPattern("[a-z");
+ assertPoorlyFormattedPattern("a{,4}");
+ assertPoorlyFormattedPattern("a{0,a}");
+ assertPoorlyFormattedPattern("a{\\1, 2}");
+ assertPoorlyFormattedPattern("[]");
+ assertPoorlyFormattedPattern("a{}");
+ assertPoorlyFormattedPattern("{3,4}");
+ assertPoorlyFormattedPattern("a+{3,4}");
+ assertPoorlyFormattedPattern("*.");
+ assertPoorlyFormattedPattern(".+*");
+ assertPoorlyFormattedPattern("a{3,4");
+ assertPoorlyFormattedPattern("[a");
+ assertPoorlyFormattedPattern("abc\\");
+ assertPoorlyFormattedPattern("+.");
+
+ StringBuilder charSet = new StringBuilder("[");
+ for (int i = 0; i < 1024; i++) {
+ charSet.append('a' + (i % 26));
+ }
+ charSet.append("]");
+ assertPoorlyFormattedPattern(charSet.toString());
+ }
+
+ private void assertMatches(String string, PatternMatcher matcher) {
+ assertTrue("'" + string + "' should match '" + matcher.toString() + "'",
+ matcher.match(string));
+ }
+
+ private void assertNotMatches(String string, PatternMatcher matcher) {
+ assertTrue("'" + string + "' should not match '" + matcher.toString() + "'",
+ !matcher.match(string));
+ }
+
+ private void assertPoorlyFormattedPattern(String format) {
+ try {
+ new PatternMatcher(format, PatternMatcher.PATTERN_ADVANCED_GLOB);
+ } catch (IllegalArgumentException e) {
+ return;// expected
+ }
+
+ fail("'" + format + "' was erroneously created");
+ }
+}
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