public void updateParseTreeFromDoc(VirtualFile grammarFile) {
ANTLRv4PluginController controller = ANTLRv4PluginController.getInstance(project);
PreviewState previewState = controller.getPreviewState(grammarFile);
LOG.info("updateParseTreeFromDoc " + grammarFile + " rule " + previewState.startRuleName);
try {
final String inputText = previewState.getEditor().getDocument().getText();
ParsingResult results = controller.parseText(grammarFile, inputText);
if (results != null) {
updateTreeViewer(previewState, results);
} else if (previewState.startRuleName == null) {
indicateNoStartRuleInParseTreePane();
} else {
indicateInvalidGrammarInParseTreePane();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
