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Add comments to the HTML5 parser explaining buffer chain key holders

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This commit is contained in:
Henri Sivonen 2009-06-24 10:56:40 +03:00
parent f1577c4c26
commit fe91fa32db
1 changed files with 11 additions and 0 deletions
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11
content/html/parser/src/nsHtml5Parser.cpp
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@ -432,11 +432,22 @@ nsHtml5Parser::Parse(const nsAString& aSourceBuffer,
}
}
if (buffer->hasMore()) {
// If we got here, the buffer wasn't parse synchronously to completion
// and it's tail needs to go into the chain of pending buffers.
// The script is identified by aKey. If there's nothing in the buffer
// chain for that key, we'll insert at the head of the queue.
// When the script leaves something in the queue, a zero-length
// key-holder "buffer" is inserted in the queue. If the same script
// leaves something in the chain again, it will be inserted immediately
// before the old key holder belonging to the same script.
nsHtml5UTF16Buffer* prevSearchBuf = nsnull;
nsHtml5UTF16Buffer* searchBuf = mFirstBuffer;
if (aKey) { // after document.open, the first level of document.write has null key
while (searchBuf != mLastBuffer) {
if (searchBuf->key == aKey) {
// found a key holder
// now insert the new buffer between the previous buffer
// and the key holder.
buffer->next = searchBuf;
if (prevSearchBuf) {
prevSearchBuf->next = buffer;