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| private int substitute(final LogEvent event, final StringBuilder buf, final int offset, final int length,
List<String> priorVariables) {
final StrMatcher prefixMatcher = getVariablePrefixMatcher();
final StrMatcher suffixMatcher = getVariableSuffixMatcher();
final char escape = getEscapeChar();
final StrMatcher valueDelimiterMatcher = getValueDelimiterMatcher();
final boolean substitutionInVariablesEnabled = isEnableSubstitutionInVariables();
final boolean top = priorVariables == null;
boolean altered = false;
int lengthChange = 0;
char[] chars = getChars(buf);
int bufEnd = offset + length;
int pos = offset;
while (pos < bufEnd) {
final int startMatchLen = prefixMatcher.isMatch(chars, pos, offset, bufEnd);
if (startMatchLen == 0) {
pos++;
} else
if (pos > offset && chars[pos - 1] == escape) {
buf.deleteCharAt(pos - 1);
chars = getChars(buf);
lengthChange--;
altered = true;
bufEnd--;
} else {
final int startPos = pos;
pos += startMatchLen;
int endMatchLen = 0;
int nestedVarCount = 0;
while (pos < bufEnd) {
if (substitutionInVariablesEnabled
&& (endMatchLen = prefixMatcher.isMatch(chars, pos, offset, bufEnd)) != 0) {
nestedVarCount++;
pos += endMatchLen;
continue;
}
endMatchLen = suffixMatcher.isMatch(chars, pos, offset, bufEnd);
if (endMatchLen == 0) {
pos++;
} else {
if (nestedVarCount == 0) {
String varNameExpr = new String(chars, startPos + startMatchLen, pos - startPos - startMatchLen);
if (substitutionInVariablesEnabled) {
final StringBuilder bufName = new StringBuilder(varNameExpr);
substitute(event, bufName, 0, bufName.length());
varNameExpr = bufName.toString();
}
pos += endMatchLen;
final int endPos = pos;
String varName = varNameExpr;
String varDefaultValue = null;
if (valueDelimiterMatcher != null) {
final char [] varNameExprChars = varNameExpr.toCharArray();
int valueDelimiterMatchLen = 0;
for (int i = 0; i < varNameExprChars.length; i++) {
if (!substitutionInVariablesEnabled
&& prefixMatcher.isMatch(varNameExprChars, i, i, varNameExprChars.length) != 0) {
break;
}
if (valueEscapeDelimiterMatcher != null) {
int matchLen = valueEscapeDelimiterMatcher.isMatch(varNameExprChars, i);
if (matchLen != 0) {
String varNamePrefix = varNameExpr.substring(0, i) + Interpolator.PREFIX_SEPARATOR;
varName = varNamePrefix + varNameExpr.substring(i + matchLen - 1);
for (int j = i + matchLen; j < varNameExprChars.length; ++j){
if ((valueDelimiterMatchLen = valueDelimiterMatcher.isMatch(varNameExprChars, j)) != 0) {
varName = varNamePrefix + varNameExpr.substring(i + matchLen, j);
varDefaultValue = varNameExpr.substring(j + valueDelimiterMatchLen);
break;
}
}
break;
} else if ((valueDelimiterMatchLen = valueDelimiterMatcher.isMatch(varNameExprChars, i)) != 0) {
varName = varNameExpr.substring(0, i);
varDefaultValue = varNameExpr.substring(i + valueDelimiterMatchLen);
break;
}
} else if ((valueDelimiterMatchLen = valueDelimiterMatcher.isMatch(varNameExprChars, i)) != 0) {
varName = varNameExpr.substring(0, i);
varDefaultValue = varNameExpr.substring(i + valueDelimiterMatchLen);
break;
}
}
}
if (priorVariables == null) {
priorVariables = new ArrayList<>();
priorVariables.add(new String(chars, offset, length + lengthChange));
}
checkCyclicSubstitution(varName, priorVariables);
priorVariables.add(varName);
String varValue = resolveVariable(event, varName, buf, startPos, endPos);
if (varValue == null) {
varValue = varDefaultValue;
}
if (varValue != null) {
final int varLen = varValue.length();
buf.replace(startPos, endPos, varValue);
altered = true;
int change = substitute(event, buf, startPos, varLen, priorVariables);
change = change + (varLen - (endPos - startPos));
pos += change;
bufEnd += change;
lengthChange += change;
chars = getChars(buf);
}
priorVariables.remove(priorVariables.size() - 1);
break;
}
nestedVarCount--;
pos += endMatchLen;
}
}
}
}
if (top) {
return altered ? 1 : 0;
}
return lengthChange;
}
|
