/**
* Expand constructions like rules and queries
*
* @param drl
* @return
*/
private StringBuffer expandConstructions(final String drl) {
// display keys if requested
if (showKeyword) {
for (DSLMappingEntry entry : this.keywords) {
System.out.println("keyword: " + entry.getMappingKey());
System.out.println(" " + entry.getKeyPattern());
}
}
if (showWhen) {
for (DSLMappingEntry entry : this.condition) {
System.out.println("when: " + entry.getMappingKey());
System.out.println(" " + entry.getKeyPattern());
// System.out.println( " " + entry.getValuePattern() );
}
}
if (showThen) {
for (DSLMappingEntry entry : this.consequence) {
System.out.println("then: " + entry.getMappingKey());
System.out.println(" " + entry.getKeyPattern());
}
}
// parse and expand specific areas
final Matcher m = finder.matcher(drl);
final StringBuffer buf = new StringBuffer();
int drlPos = 0;
int linecount = 0;
while (m.find()) {
final StringBuilder expanded = new StringBuilder();
int newPos = m.start();
linecount += countNewlines(drl, drlPos, newPos);
drlPos = newPos;
String constr = m.group().trim();
if (constr.startsWith("rule")) {
String headerFragment = m.group(1);
expanded.append(headerFragment); // adding rule header and attributes
String lhsFragment = m.group(2);
expanded.append(
this.expandLHS(lhsFragment, linecount + countNewlines(drl, drlPos, m.start(2)) + 1));
String thenFragment = m.group(3);
expanded.append(thenFragment); // adding "then" header
String rhsFragment =
this.expandRHS(m.group(4), linecount + countNewlines(drl, drlPos, m.start(4)) + 1);
expanded.append(rhsFragment);
expanded.append(m.group(5)); // adding rule trailer
} else if (constr.startsWith("query")) {
String fragment = m.group(6);
expanded.append(fragment); // adding query header and attributes
String lhsFragment =
this.expandLHS(m.group(7), linecount + countNewlines(drl, drlPos, m.start(7)) + 1);
expanded.append(lhsFragment);
expanded.append(m.group(8)); // adding query trailer
} else {
// strange behavior
this.addError(new ExpanderException("Unable to expand statement: " + constr, 0));
}
m.appendReplacement(buf, Matcher.quoteReplacement(expanded.toString()));
}
m.appendTail(buf);
return buf;
}
