position stored in a register.
* Base 64:: Conversion to or from base 64 encoding.
* MD5 Checksum:: Compute the MD5 "message digest"/"checksum".
+* Parsing HTML:: Parsing HTML and XML.
* Atomic Changes:: Installing several buffer changes "atomically".
* Change Hooks:: Supplying functions to be run when text is changed.
@end menu
@defvar interprogram-cut-function
This variable provides a way of communicating killed text to other
programs, when you are using a window system. Its value should be
-@code{nil} or a function of one required and one optional argument.
+@code{nil} or a function of one required argument.
If the value is a function, @code{kill-new} and @code{kill-append} call
-it with the new first element of the kill ring as the first argument.
-The second, optional, argument has the same meaning as the @var{push}
-argument to @code{x-set-cut-buffer} (@pxref{Definition of
-x-set-cut-buffer}) and only affects the second and later cut buffers.
+it with the new first element of the kill ring as the argument.
The normal use of this function is to set the window system's primary
-selection (and first cut buffer) from the newly killed text.
+selection from the newly killed text.
@xref{Window System Selections}.
@end defvar
command stops at such a boundary, and successive undo commands undo
to earlier and earlier boundaries. This function returns @code{nil}.
-The editor command loop automatically creates an undo boundary before
-each key sequence is executed. Thus, each undo normally undoes the
-effects of one command. Self-inserting input characters are an
-exception. The command loop makes a boundary for the first such
-character; the next 19 consecutive self-inserting input characters do
-not make boundaries, and then the 20th does, and so on as long as
-self-inserting characters continue.
+The editor command loop automatically calls @code{undo-boundary} just
+before executing each key sequence, so that each undo normally undoes
+the effects of one command. As an exception, the command
+@code{self-insert-command}, which produces self-inserting input
+characters (@pxref{Commands for Insertion}), may remove the boundary
+inserted by the command loop: a boundary is accepted for the first
+such character, the next 19 consecutive self-inserting input
+characters do not have boundaries, and then the 20th does; and so on
+as long as the self-inserting characters continue. Hence, sequences
+of consecutive character insertions can be undone as a group.
All buffer modifications add a boundary whenever the previous undoable
change was made in some other buffer. This is to ensure that
property when Font Lock mode is enabled. When Font Lock mode is disabled,
@code{font-lock-face} has no effect.
-The @code{font-lock-mode} property is useful for special modes that
+The @code{font-lock-face} property is useful for special modes that
implement their own highlighting. @xref{Precalculated Fontification}.
@item mouse-face
coding instead.
@end defun
+@node Parsing HTML
+@section Parsing HTML
+@cindex parsing html
+@cindex parsing xml
+
+Emacs provides an interface to the @code{libxml2} library via two
+functions: @code{html-parse-buffer} and @code{xml-parse-buffer}. The
+HTML function will parse ``real world'' HTML and try to return a
+sensible parse tree, while the XML function is somewhat stricter about
+syntax.
+
+They both take a two optional parameter. The first is a buffer, and
+the second is a base URL to be used to expand relative URLs in the
+document, if any.
+
+Here's an example demonstrating the structure of the parsed data you
+get out. Given this HTML document:
+
+@example
+<html><hEad></head><body width=101><div class=thing>Foo<div>Yes
+@end example
+
+You get this parse tree:
+
+@example
+(html
+ (head)
+ (body
+ (:width . "101")
+ (div
+ (:class . "thing")
+ (text . "Foo")
+ (div
+ (text . "Yes\n")))))
+@end example
+
+It's a simple tree structure, where the @code{car} for each node is
+the name of the node, and the @code{cdr} is the value, or the list of
+values.
+
+Attributes are coded the same way as child nodes, but with @samp{:} as
+the first character.
+
@node Atomic Changes
@section Atomic Change Groups
@cindex atomic changes
HCoop / bpt / emacs.git / blobdiff