/**
* This function returns the begin offset of the input string where the first matched pattern is
* found.
*
* @param pattern pattern string to match
* @param input input string
* @return returns the offset of the beginning of the first matched pattern. if the match not
* found, it returns -1.
* @exception throws a FrameworkException when either pattern/input is null.
*/
public static int getBeginOffset(String pattern, String input) throws FrameworkException {
if (input == null || pattern == null) {
throw new FrameworkException(
"RegexUtils: getBeginOffset(): input or pattern is null."
+ "input = "
+ input
+ ", "
+ "pattern = "
+ pattern);
}
Perl5Util util = new Perl5Util();
int beginOffset = -1;
String formatPattern = null;
formatPattern = makePerl5MatchPattern(pattern);
if (util.match(formatPattern, input)) {
beginOffset = util.beginOffset(0);
} else {
Debug.log(Debug.MSG_STATUS, "RegexUtils: getBeginOffset(): No match found.");
}
return beginOffset;
}
/**
* This function substitues ALL the occurence of the pattern in the input with the replacement
* passed in. The substitution is done only in the range bound by the begin token and the end
* token.
*
* @param pattern pattern string to match
* @param input input string
* @param replacement replacement string to replace with
* @param beginToken begin boundary token
* @param endToken end boundary token
* @param beginTokens[] an array of beginTokens - this is used for negative look ahead where there
* are other begin tokens to be recognized.
* @return returns processed string if both beginToken and the endToken are successfully found,
* returns the unproessed original input otherwise.
* @exception throws a FrameworkException when either pattern/input/replacement is null.
*/
public static String replaceAll(
String pattern,
String input,
String replacement,
String beginToken,
String endToken,
String beginTokens[])
throws FrameworkException {
if ((pattern == null) || (replacement == null) || (input == null)) {
Debug.log(
Debug.ALL_ERRORS,
"RegexUtils: replaceAll(): pattern or replacement or input is null. "
+ "\npattern = "
+ pattern
+ "\ninput = "
+ input
+ "\nreplacement = "
+ replacement);
throw new FrameworkException(
"RegexUtils: replaceAll(): pattern or replacement or input is null.");
}
Perl5Util util = new Perl5Util();
StringBuffer resultBuffer = new StringBuffer();
if ((beginToken == null) || (endToken == null)) {
// either beginToken or endToken cannot be null, however both can be null.
throw new FrameworkException(
"RegexUtils: replaceAll(): Either begin or end token is null. BeginToken = "
+ beginToken
+ ", "
+ "endToken = "
+ endToken);
} else // do pattern match
{
// making the Perl5 regular expression format pattern
String begin = makePerl5MatchPattern(beginToken);
String end = makePerl5MatchPattern(endToken);
boolean beginTokenMatch = true;
// if begin token found
while (beginTokenMatch) {
// check the input for each iteration. when there is no input, break out of the loop.
if (input == null) break;
beginTokenMatch = util.match(begin, input);
if (beginTokenMatch) {
String negativeLookAheadPattern =
makePerl5MatchPatternNegativeLookAhead(pattern, replacement);
int beginOffsetForBeginToken = util.beginOffset(0);
int endOffsetForBeginToken = util.endOffset(0);
// the input after the begin token
String subInput = input.substring(endOffsetForBeginToken);
// if end token passed in was an empty string
if (endToken.equals("")) {
String result = null;
try {
result = replaceAllWithBeginToken(pattern, input, replacement, beginToken);
} catch (FrameworkException e) {
Debug.log(Debug.ALL_ERRORS, "RegexUtils: replaceAll() failed." + e.getMessage());
}
return result;
} else if (util.match(end, subInput)) // endToken found
{
// begin offset for the end token relative to the input not subInput
int beginOffsetForEndToken = endOffsetForBeginToken + util.beginOffset(0);
int endOffsetForEndToken = endOffsetForBeginToken + util.endOffset(0);
// pre is the string before the beginToken and the beginToken
String pre = input.substring(0, endOffsetForBeginToken);
resultBuffer.append(pre);
// current is the string between the beginToken and the endToken
String current = input.substring(endOffsetForBeginToken, beginOffsetForEndToken);
// theRest is the rest of the input string after the endToken
String theRest = input.substring(endOffsetForEndToken);
// current is the string between begin token and the endtoken
current = skipOrphanedBeginToken(begin, current, resultBuffer);
if (isOtherBeginTokenThere(beginToken, current, beginTokens) == false) {
current = replaceAll(pattern, current, replacement);
} // isOtherBeginTokenThere
resultBuffer.append(current);
resultBuffer.append(input.substring(beginOffsetForEndToken, endOffsetForEndToken));
input = theRest;
} else // endToken not found
{
resultBuffer.append(input);
break;
}
} // if beginToken found
else // beginToken not found
{
resultBuffer.append(input);
break;
}
} // while begin token found
} // else do pattern match
return resultBuffer.toString();
}