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how find-tag works?


From: a.efremov
Subject: how find-tag works?
Date: Wed, 28 Mar 2012 19:22:04 -0000
User-agent: G2/1.0

Hello,

Is there some article about how emacs find-tag works?

TAGS file contains extracted lines. Each line ends with a "tag word".

M-. "finds tag". Does it look only for "tag word"? Or "grep" desired
tag from TAGS file.

C-u M-. "find next".  it seems that emacs "grep" TAGS file to find
next match.

It's not clear how algorithm works. If emacs does just "grep" of TAGS
file what is the usage of tag at the end of line?

I could guess that it looks for "tag" first then does "grep", but it
would be more interesting to read about how it actually works.

GNU Emacs 23.2.1 (x86_64-redhat-linux-gnu, GTK+ Version 2.21.4)

thank you,
alexander


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