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package com.jclark.xml.tok;
/**
* An XML TextDecl.
* @version $Revision: 1.4 $ $Date: 1998/12/30 02:42:01 $
*/
public class TextDecl {
private String version;
private String encoding;
/**
* Creates a <code>TextDecl</code> from the specified byte subarray.
* The specified encoding is used to convert bytes to characters.
* The byte subarray should be a <code>TOK_XML_DECL</code> token
* returned from Encoding.tokenizeProlog or Encoding.tokenizeContent,
* starting with <code><?</code> and ending with <code>?></code>.
* @exception InvalidTokenException if the specified byte subarray
* is not a legal XML TextDecl.
*/
public TextDecl(Encoding enc, byte[] buf, int off, int end)
throws InvalidTokenException {
init(false, enc, buf, off, end);
}
/**
* Return the encoding specified in the declaration, or null
* if no encoding was specified.
*/
public String getEncoding() {
return encoding;
}
/**
* Return the version specified in the declaration, or null
* if no version was specified.
*/
public String getVersion() {
return version;
}
TextDecl() { }
boolean init(boolean isXmlDecl, Encoding enc, byte[] buf, int off, int end) throws InvalidTokenException {
// Skip <?xml
off += enc.getMinBytesPerChar()*5;
// Skip ?>
end -= enc.getMinBytesPerChar()*2;
ContentToken ct = new ContentToken();
int firstErrorIndex = -1;
try {
parsePseudoAttributes(enc, buf, off, end, ct);
}
catch (InvalidTokenException e) {
firstErrorIndex = e.getOffset();
}
int nAtts = ct.getAttributeSpecifiedCount();
if (nAtts == 0) {
if (firstErrorIndex == -1)
firstErrorIndex = end;
throw new InvalidTokenException(firstErrorIndex);
}
String[] names = new String[nAtts];
String[] values = new String[nAtts];
char[] cbuf = new char[32];
for (int i = 0; i < nAtts; i++) {
int s = ct.getAttributeNameStart(i);
int e = ct.getAttributeNameEnd(i);
if (e - s > cbuf.length)
cbuf = new char[e - s];
names[i] = new String(cbuf, 0, enc.convert(buf, s, e, cbuf, 0));
s = ct.getAttributeValueStart(i);
e = ct.getAttributeValueEnd(i);
if (e - s > cbuf.length)
cbuf = new char[e - s];
values[i] = new String(cbuf, 0, enc.convert(buf, s, e, cbuf, 0));
}
int att = 0;
if (names[0].equals("version")) {
version = values[0];
att++;
}
if ((att == 1 || !isXmlDecl)
&& att < nAtts && names[att].equals("encoding")) {
encoding = values[att];
if (values[att].length() == 0
|| !Character.isLetter(values[att].charAt(0))
|| values[att].indexOf(':') >= 0) {
int k = ct.getAttributeValueStart(att);
if (firstErrorIndex == -1 || k < firstErrorIndex)
firstErrorIndex = k;
}
att++;
}
else if (!isXmlDecl)
firstErrorIndex = 0; // encoding is required in a TextDecl
boolean standalone = false;
if (isXmlDecl && att > 0 && att < nAtts
&& names[att].equals("standalone")) {
if (values[att].equals("yes"))
standalone = true;
else if (!values[att].equals("no")) {
int k = ct.getAttributeValueStart(att);
if (firstErrorIndex == -1 || k < firstErrorIndex)
firstErrorIndex = k;
}
att++;
}
if (att < nAtts) {
int k = ct.getAttributeNameStart(att);
if (firstErrorIndex == -1 || k < firstErrorIndex)
firstErrorIndex = k;
}
if (firstErrorIndex != -1)
throw new InvalidTokenException(firstErrorIndex);
return standalone;
}
private final
void parsePseudoAttributes(Encoding enc, byte[] buf, int off, int end,
ContentToken ct) throws InvalidTokenException {
final int minBPC = enc.getMinBytesPerChar();
for (;;) {
off = skipWS(enc, buf, off, end);
if (off == end)
break;
int nameStart = off;
int nameEnd;
nameLoop:
for (;;) {
switch (enc.byteType(buf, off)) {
case Encoding.BT_NMSTRT:
break;
case Encoding.BT_EQUALS:
nameEnd = off;
break nameLoop;
case Encoding.BT_S:
case Encoding.BT_LF:
case Encoding.BT_CR:
nameEnd = off;
off += minBPC;
off = skipWS(enc, buf, off, end);
if (off == end || !enc.charMatches(buf, off, '='))
throw new InvalidTokenException(off);
break nameLoop;
default:
throw new InvalidTokenException(off);
}
off += minBPC;
if (off == end)
throw new InvalidTokenException(off);
}
off += minBPC;
off = skipWS(enc, buf, off, end);
if (off == end || !(enc.charMatches(buf, off, '\'')
|| enc.charMatches(buf, off, '"')))
throw new InvalidTokenException(off);
off += minBPC;
int valueStart = off;
valueLoop:
for (;;) {
if (off == end)
throw new InvalidTokenException(off);
switch (enc.byteType(buf, off)) {
case Encoding.BT_NMSTRT:
case Encoding.BT_NAME:
case Encoding.BT_MINUS:
if ((enc.byteToAscii(buf, off) & ~0x7F) != 0)
throw new InvalidTokenException(off);
off += minBPC;
break;
case Encoding.BT_QUOT:
case Encoding.BT_APOS:
if (enc.byteType(buf, off) != enc.byteType(buf, valueStart - minBPC))
throw new InvalidTokenException(off);
break valueLoop;
default:
throw new InvalidTokenException(off);
}
}
ct.appendAttribute(nameStart, nameEnd, valueStart, off, true);
off += minBPC;
if (off == end)
break;
switch (enc.byteType(buf, off)) {
case Encoding.BT_S:
case Encoding.BT_LF:
case Encoding.BT_CR:
off += minBPC;
break;
default:
throw new InvalidTokenException(off);
}
}
}
private int skipWS(Encoding enc, byte[] buf, int off, int end) {
loop:
while (off != end) {
switch (enc.byteType(buf, off)) {
case Encoding.BT_S:
case Encoding.BT_LF:
case Encoding.BT_CR:
off += enc.getMinBytesPerChar();
break;
default:
break loop;
}
}
return off;
}
}
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