private String debugHiddenTokens(antlr.CommonHiddenStreamToken t) {
final StringBuilder sb = new StringBuilder();
for (; t != null; t = filter.getHiddenAfter(t)) {
if (sb.length() == 0) {
sb.append("[");
}
sb.append(t.getText().replace("\n", "\\n"));
}
if (sb.length() > 0) {
sb.append("]");
}
return sb.toString();
}
private PdeRecognizer createParser(final String program) {
// create a lexer with the stream reader, and tell it to handle
// hidden tokens (eg whitespace, comments) since we want to pass these
// through so that the line numbers when the compiler reports errors
// match those that will be highlighted in the PDE IDE
//
PdeLexer lexer = new PdeLexer(new StringReader(program));
lexer.setTokenObjectClass("antlr.CommonHiddenStreamToken");
// create the filter for hidden tokens and specify which tokens to
// hide and which to copy to the hidden text
//
filter = new TokenStreamCopyingHiddenTokenFilter(lexer);
filter.hide(PdePartialTokenTypes.SL_COMMENT);
filter.hide(PdePartialTokenTypes.ML_COMMENT);
filter.hide(PdePartialTokenTypes.WS);
filter.copy(PdePartialTokenTypes.SEMI);
filter.copy(PdePartialTokenTypes.LPAREN);
filter.copy(PdePartialTokenTypes.RPAREN);
filter.copy(PdePartialTokenTypes.LCURLY);
filter.copy(PdePartialTokenTypes.RCURLY);
filter.copy(PdePartialTokenTypes.COMMA);
filter.copy(PdePartialTokenTypes.RBRACK);
filter.copy(PdePartialTokenTypes.LBRACK);
filter.copy(PdePartialTokenTypes.COLON);
filter.copy(PdePartialTokenTypes.TRIPLE_DOT);
// Because the meanings of < and > are overloaded to support
// type arguments and type parameters, we have to treat them
// as copyable to hidden text (or else the following syntax,
// such as (); and what not gets lost under certain circumstances)
// -- jdf
filter.copy(PdePartialTokenTypes.LT);
filter.copy(PdePartialTokenTypes.GT);
filter.copy(PdePartialTokenTypes.SR);
filter.copy(PdePartialTokenTypes.BSR);
// create a parser and set what sort of AST should be generated
//
final PdeRecognizer parser = new PdeRecognizer(this, filter);
// use our extended AST class
//
parser.setASTNodeClass("antlr.ExtendedCommonASTWithHiddenTokens");
return parser;
}
CommonHiddenStreamToken getInitialHiddenToken() {
return filter.getInitialHiddenToken();
}
CommonHiddenStreamToken getHiddenAfter(final CommonHiddenStreamToken t) {
return filter.getHiddenAfter(t);
}
