I am a parser for news files in the format output by the Unix 'readnews' program.

	scanning
	allDashes: appendLine: endOfArticleDo: newsMessagesDo: parse:do: setNewsGroup: startOfArticle:

	read-write	top
	readFrom: This operation is a noop for news inboxes. Use 'messagesDo:' to enumerate the messages in the inbox.
	writeOn: This operation is illegal for news inboxes.

	scanning	top
	allDashes: Answer true if the given string is not empty and consists entirely of dash characters.
	appendLine: Append the given line to the buffer.
	endOfArticleDo: We've just hit the end of an article. Evaluate the given block on the article we've been accumulating in the buffer (if any) and reset the buffer for the next article.
	newsMessagesDo: Invoke the given block for each message in the news inbox file. The block arguments are the newsgroup name and the text of a new message.
	parse:do: Parse the given stream into newsgroup articles, invoking the given block once for each article in the stream. The stream is divided into articles by two kinds of delimiters. The first kind indicates the start of a new newsgroup and includes the newsgroup name. The second kind indicates the start of a new article within a newsgroup.
	setNewsGroup: Set the current newsgroup name from the given line of text, which is of the form: Newsgroup comp.lang.smalltalk
	startOfArticle: Answer true if the given string is the start of a new news article. That is, does it start with the string 'Article ' and end with a period?