/**
* With start token being the first non-ignorable token inside the declaration block, iterate
* issuing CssDeclaration objects until the block ends.
*/
private void handleDeclarationBlock(
CssToken start, CssTokenIterator iter, final CssContentHandler doc, CssErrorHandler err)
throws CssException {
while (true) {
if (MATCH_CLOSEBRACE.apply(start)) {
return;
}
CssDeclaration decl = handleDeclaration(start, iter, doc, err, false);
try {
if (decl != null) {
doc.declaration(decl);
if (debug) {
checkState(MATCH_SEMI_CLOSEBRACE.apply(iter.last));
}
// continue or return: we may be at "; next decl" or "}" or ";}"
if (MATCH_CLOSEBRACE.apply(iter.last)) {
return;
} else if (MATCH_SEMI.apply(iter.last) && MATCH_CLOSEBRACE.apply(iter.peek())) {
iter.next();
return;
} else {
if (debug) {
checkState(MATCH_SEMI.apply(iter.last));
}
// we have ';', expect another decl
start = iter.next(); // first token after ';'
}
} else {
// #handleDeclaration returned null to signal error
// #handleDeclaration has issued errors, we forward
start = iter.next(MATCH_SEMI_CLOSEBRACE);
if (MATCH_SEMI.apply(start)) {
start = iter.next();
}
}
} catch (NoSuchElementException nse) {
err.error(
new CssGrammarException(
GRAMMAR_PREMATURE_EOF, iter.last.location, "';' " + Messages.get("or") + " '}'"));
throw new PrematureEOFException();
}
}
}
/**
* With iter.last at '{', discover the at-rule type. The contents is a ruleset if '{' comes before
* ';' or '}'.
*/
private boolean hasRuleSet(CssAtRule atRule, CssTokenIterator iter) {
int debugIndex;
if (debug) {
checkArgument(iter.last.getChar() == '{');
debugIndex = iter.index();
}
List<CssToken> list = iter.list;
for (int i = iter.index() + 1; i < list.size(); i++) {
CssToken tk = list.get(i);
if (MATCH_OPENBRACE.apply(tk)) {
return true;
} else if (MATCH_SEMI_CLOSEBRACE.apply(tk)) {
return false;
}
}
if (debug) {
checkState(iter.last.getChar() == '{');
checkState(iter.index() == debugIndex);
}
return false;
}
/** Parse a CSS document. */
public void parse(
final Reader reader,
final String systemID,
final CssErrorHandler err,
final CssContentHandler doc)
throws IOException, CssException {
CssTokenIterator iter = scan(reader, systemID, err);
doc.startDocument();
while (iter.hasNext(FILTER_S_CMNT_CDO_CDC)) {
CssToken tk = iter.next(FILTER_S_CMNT_CDO_CDC);
try {
if (tk.type == CssToken.Type.ATKEYWORD) {
handleAtRule(tk, iter, doc, err);
if (debug) {
checkArgument(MATCH_SEMI_CLOSEBRACE.apply(iter.last));
}
} else {
handleRuleSet(tk, iter, doc, err);
if (debug) {
checkArgument(MATCH_CLOSEBRACE.apply(iter.last));
}
}
} catch (PrematureEOFException te) {
// The subroutines report premature EOF to ErrHandler
// on occurrence; if the listener rethrows it will
// be a CssException so we don't catch it here.
break;
}
}
doc.endDocument();
}
/**
* With start expected to be an IDENT token representing the property name, build the declaration
* and return after hitting ';' or '}'. On error, issue to errhandler, return null, caller
* forwards.
*/
private CssDeclaration handleDeclaration(
CssToken name,
CssTokenIterator iter,
CssContentHandler doc,
CssErrorHandler err,
boolean isStyleAttribute)
throws CssException {
if (name.type != CssToken.Type.IDENT) {
err.error(
new CssGrammarException(
GRAMMAR_EXPECTING_TOKEN,
name.location,
name.getChars(),
Messages.get("a_property_name")));
return null;
}
CssDeclaration declaration = new CssDeclaration(name.getChars(), name.location);
try {
if (!MATCH_COLON.apply(iter.next())) {
err.error(
new CssGrammarException(
GRAMMAR_EXPECTING_TOKEN, name.location, iter.last.getChars(), ":"));
return null;
}
} catch (NoSuchElementException nse) {
err.error(new CssGrammarException(GRAMMAR_PREMATURE_EOF, iter.last.location, ":"));
throw new PrematureEOFException();
}
try {
while (true) {
CssToken value = iter.next();
if (MATCH_SEMI_CLOSEBRACE.apply(value)) {
if (declaration.components.size() < 1) {
err.error(
new CssGrammarException(
GRAMMAR_EXPECTING_TOKEN,
iter.last.location,
value.getChar(),
Messages.get("a_property_value")));
return null;
} else {
return declaration;
}
} else {
if (!handlePropertyValue(declaration, value, iter, isStyleAttribute)) {
err.error(
new CssGrammarException(
GRAMMAR_UNEXPECTED_TOKEN, iter.last.location, iter.last.getChars()));
return null;
} else {
if (isStyleAttribute && !iter.hasNext()) {
return declaration;
}
}
}
}
} catch (NoSuchElementException nse) {
err.error(
new CssGrammarException(
GRAMMAR_PREMATURE_EOF, iter.last.location, "';' " + Messages.get("or") + " '}'"));
throw new PrematureEOFException();
}
}
