/* Check if there is a DOCTYPE at the start of the elements
* list. If there is, return the appropriate version string.
* If the DOCTYPE says it isn't HTML, trust it and call this
* document ill-formed by returning -1.
* If there is no DOCTYPE, or an unrecognized one, return 0.
*/
protected int checkDoctype(List elements) {
JHElement firstElem = (JHElement) elements.get(0);
if (firstElem instanceof JHXmlDecl && elements.size() >= 2) {
firstElem = (JHElement) elements.get(1);
}
if (!(firstElem instanceof JHDoctype)) {
return 0; // no DOCTYPE found
}
List dt = ((JHDoctype) firstElem).getDoctypeElements();
if (dt.size() < 3) {
return 0;
}
try {
// Is DOCTYPE case sensitive? Assume not.
String str = ((String) dt.get(0)).toUpperCase();
if (!"HTML".equals(str)) {
// It's not HTML
return -1;
}
str = ((String) dt.get(1)).toUpperCase();
if (!"PUBLIC".equals(str)) {
return 0;
}
str = stripQuotes(((String) dt.get(2)).toUpperCase());
_doctype = str;
if ("-//W3C//DTD HTML 3.2 FINAL//EN".equals(str) || "-//W3C//DTD HTML 3.2//EN".equals(str)) {
return HTML_3_2;
} else if ("-//W3C//DTD HTML 4.0//EN".equals(str)) {
return HTML_4_0_STRICT;
} else if ("-//W3C//DTD HTML 4.0 TRANSITIONAL//EN".equals(str)) {
return HTML_4_0_TRANSITIONAL;
} else if ("-//W3C//DTD HTML 4.0 FRAMESET//EN".equals(str)) {
return HTML_4_0_FRAMESET;
} else if ("-//W3C//DTD HTML 4.01//EN".equals(str)) {
return HTML_4_01_STRICT;
} else if ("-//W3C//DTD HTML 4.01 TRANSITIONAL//EN".equals(str)) {
return HTML_4_01_TRANSITIONAL;
} else if ("-//W3C//DTD HTML 4.01 FRAMESET//EN".equals(str)) {
return HTML_4_01_FRAMESET;
}
} catch (Exception e) {
// Really shouldn't happen, but if it does we've got
// a bad doctype
return 0;
}
return 0;
}
/* See if this document, even if it lacks a doctype, is most likely
* XHTML. The test is that the document starts with an XML declaration
* and has "html" for its first tag.
*
* Returns:
* 0 if there's no XML declaration
* 1 if there's an XML declaration but no html tag; in this
* case it's probably some other kind of XML
* 2 if there's an XML declaration and an html tag
*
*/
protected int seemsToBeXHTML(List elements) {
JHElement elem;
try {
elem = (JHElement) elements.get(0);
if (!(elem instanceof JHXmlDecl)) {
return 0;
}
Iterator iter = elements.iterator();
while (iter.hasNext()) {
elem = (JHElement) iter.next();
if (elem instanceof JHOpenTag) {
JHOpenTag tag = (JHOpenTag) elem;
return ("html".equals(tag.getName()) ? 2 : 1);
}
}
} catch (Exception e) {
return 0; // document must be really empty
}
return 1;
}