protected String getErrorMessage(RecognitionException re) {
String message = "";
Parser recognizer = (Parser) re.getRecognizer();
TokenStream tokens = recognizer.getInputStream();
if (re instanceof NoViableAltException) {
NoViableAltException e = (NoViableAltException) re;
Token startToken = e.getStartToken();
String input =
(startToken.getType() == Token.EOF)
? "end of text"
: quote(tokens.getText(startToken, e.getOffendingToken()));
message = "no viable date format found at " + input;
} else if (re instanceof InputMismatchException) {
InputMismatchException e = (InputMismatchException) re;
message =
"did not expect "
+ getTokenDisplayString(e.getOffendingToken())
+ " while looking for "
+ e.getExpectedTokens().toString(recognizer.getTokenNames());
} else if (re instanceof FailedPredicateException) {
FailedPredicateException e = (FailedPredicateException) re;
String ruleName = recognizer.getRuleNames()[recognizer.getContext().getRuleIndex()];
message = "failed predicate " + ruleName + ": " + e.getMessage();
}
return message;
}
/**
* Prints the postscript parsetree to a .ps file with the given name
*
* @param filename used to generate a file of the form <filename>.ps
*/
public void outputPSGraphToFile(String filename) {
try {
rootCtx.save(Arrays.asList(parser.getRuleNames()), filename + ".ps");
} catch (IOException | PrintException e) {
e
.printStackTrace(); // To change body of catch statement use File | Settings | File
// Templates.
}
}
protected String getDecisionDescription(@NotNull Parser recognizer, @NotNull DFA dfa) {
int decision = dfa.decision;
int ruleIndex = dfa.atnStartState.ruleIndex;
String[] ruleNames = recognizer.getRuleNames();
if (ruleIndex < 0 || ruleIndex >= ruleNames.length) {
return String.valueOf(decision);
}
String ruleName = ruleNames[ruleIndex];
if (ruleName == null || ruleName.isEmpty()) {
return String.valueOf(decision);
}
return String.format("%d (%s)", decision, ruleName);
}
public List<String> getNodeStrings(
String input, String xpath, String startRuleName, String parserName, String lexerName)
throws Exception {
Pair<Parser, Lexer> pl = getParserAndLexer(input, parserName, lexerName);
Parser parser = pl.a;
ParseTree tree = execStartRule(startRuleName, parser);
List<String> nodes = new ArrayList<String>();
for (ParseTree t : XPath.findAll(tree, xpath, parser)) {
if (t instanceof RuleContext) {
RuleContext r = (RuleContext) t;
nodes.add(parser.getRuleNames()[r.getRuleIndex()]);
} else {
TerminalNode token = (TerminalNode) t;
nodes.add(token.getText());
}
}
return nodes;
}
