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package com.jclark.xsl.tr;
import com.jclark.xsl.om.*;
import com.jclark.xsl.expr.Pattern;
import com.jclark.xsl.conv.NumberListFormat;
class MultiLevelNumberAction implements Action {
private Pattern count;
private Pattern from;
private NumberListFormatTemplate formatTemplate;
static final class CacheEntry {
Node parent; // a node that matches count
Node child; // a child of parent that matches count
int n; // child is the n-th such chil
}
static final class Cache {
static final int SPARE = 4;
CacheEntry[] entries;
CacheEntry get(int level) {
if (entries == null)
entries = new CacheEntry[level + 1 + SPARE];
else if (level >= entries.length) {
CacheEntry[] old = entries;
entries = new CacheEntry[level + 1 + SPARE];
System.arraycopy(old, 0, entries, 0, old.length);
}
if (entries[level] == null)
entries[level] = new CacheEntry();
return entries[level];
}
}
MultiLevelNumberAction(Pattern count, Pattern from, NumberListFormatTemplate formatTemplate) {
this.count = count;
this.from = from;
this.formatTemplate = formatTemplate;
}
public void invoke(ProcessContext context, Node node, Result result) throws XSLException {
NumberListFormat format = formatTemplate.instantiate(context, node);
int n;
if (count == null) {
if (node.getType() == Node.ELEMENT)
n = numberUp(node.getName(), format, context, node, result);
else
n = 0;
}
else {
Cache cache = (Cache)context.get(this);
if (cache == null) {
cache = new Cache();
context.put(this, cache);
}
n = numberUp(format, context, cache, node, result);
}
if (n == 0)
result.characters(format.getPrefix(0));
result.characters(format.getSuffix());
}
private
int numberUp(NumberListFormat format,
ProcessContext context,
Cache cache,
Node node,
Result result) throws XSLException {
do {
Node parent = node.getParent();
if (from != null && from.matches(node, context))
break;
if (count.matches(node, context)) {
int level = numberUp(format, context, cache, parent, result);
CacheEntry entry = cache.get(level);
int n;
if (parent == null)
n = 1;
else if (node.equals(entry.child))
n = entry.n;
else if (parent.equals(entry.parent)
&& entry.child.compareTo(node) < 0) {
n = entry.n;
for (NodeIterator iter = entry.child.getFollowingSiblings();;) {
Node tem = iter.next();
if (count.matches(tem, context)) {
++n;
if (tem.equals(node))
break;
}
}
entry.n = n;
entry.child = node;
}
else {
n = 0;
for (NodeIterator iter = parent.getChildren();;) {
Node tem = iter.next();
if (count.matches(tem, context)) {
++n;
if (tem.equals(node))
break;
}
}
entry.parent = parent;
entry.child = node;
entry.n = n;
}
result.characters(format.getPrefix(level));
result.characters(format.formatNumber(level, n));
return level + 1;
}
node = parent;
} while (node != null);
return 0;
}
private
int numberUp(Name name,
NumberListFormat format,
ProcessContext context,
Node node,
Result result) throws XSLException {
int i = 0;
for (Node tem = node.getParent(); tem != null; tem = tem.getParent()) {
if (name.equals(tem.getName())) {
i = numberUp(name, format, context, tem, result);
break;
}
}
int n = 0;
for (NodeIterator iter = node.getParent().getChildren();;) {
Node tem = iter.next();
if (name.equals(tem.getName()) && tem.getType() == Node.ELEMENT) {
n++;
if (tem.equals(node))
break;
}
}
result.characters(format.getPrefix(i));
result.characters(format.formatNumber(i, n));
return i + 1;
}
}
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