/**
* 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 start token required to be an ATKEYWORD, collect at-rule parameters if any, and if the
* at-rule has a block, invoke those handlers.
*/
private void handleAtRule(
CssToken start, CssTokenIterator iter, CssContentHandler doc, CssErrorHandler err)
throws CssException {
if (debug) {
checkArgument(start.type == CssToken.Type.ATKEYWORD);
checkArgument(iter.index() == iter.list.indexOf(start));
checkArgument(iter.filter() == FILTER_S_CMNT);
}
CssAtRule atRule = new CssAtRule(start.getChars(), start.location);
CssToken tk;
try {
while (true) {
tk = iter.next();
if (MATCH_SEMI_OPENBRACE.apply(tk)) {
// ';' or '{', expected end
atRule.hasBlock = tk.getChar() == '{';
break;
} else {
CssConstruct param = handleAtRuleParam(tk, iter, doc, err);
if (param == null) {
// issue error, forward, then return
err.error(
new CssGrammarException(
GRAMMAR_UNEXPECTED_TOKEN, iter.last.location, iter.last.chars));
// skip to atrule closebrace, ignoring any inner blocks
int stack = 0;
while (true) {
CssToken tok = iter.next();
if (MATCH_SEMI.apply(tok) && stack == 0) {
return; // a non-block at rule
} else if (MATCH_OPENBRACE.apply(tok)) {
stack++;
} else if (MATCH_CLOSEBRACE.apply(tok)) {
if (stack == 1) {
break;
}
stack--;
}
}
return;
} else {
atRule.components.add(param);
}
}
}
} catch (NoSuchElementException nse) {
// UAs required to close any open constructs on premature EOF
doc.startAtRule(atRule);
err.error(
new CssGrammarException(
GRAMMAR_PREMATURE_EOF, iter.last.location, "';' " + Messages.get("or") + " '{'"));
doc.endAtRule(atRule.getName().get());
throw new PrematureEOFException();
}
if (debug) {
checkArgument(MATCH_SEMI_OPENBRACE.apply(iter.last));
checkArgument(iter.filter() == FILTER_S_CMNT);
}
// ending up here only on expected end
doc.startAtRule(atRule);
if (atRule.hasBlock) {
try {
if (hasRuleSet(atRule, iter)) {
while (!MATCH_CLOSEBRACE.apply(iter.next())) {
if (iter.last.type == CssToken.Type.ATKEYWORD) {
handleAtRule(iter.last, iter, doc, err);
} else {
handleRuleSet(iter.last, iter, doc, err);
}
}
} else {
handleDeclarationBlock(iter.next(), iter, doc, err);
}
} catch (NoSuchElementException nse) {
err.error(new CssGrammarException(GRAMMAR_PREMATURE_EOF, iter.last.location, "'}'"));
doc.endAtRule(atRule.name.get());
throw new PrematureEOFException();
}
}
doc.endAtRule(atRule.name.get());
}
/**
* 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();
}
}