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forward-sexp when on a floating point number

From: Oleh Krehel
Subject: forward-sexp when on a floating point number
Date: Tue, 12 Jan 2016 11:42:26 +0100

Hi all,

When working with C++ or Python code an having e.g. this point position:


I'd like "C-M-f" (`forward-sexp') to move the point here:


Instead, I get this:


This of course extends to all other sexp interactions (`mark-sexp',
`kill-sexp', `bounds-of-thing-at-point' etc).  The problem here is that
I can't do something like:

    (modify-syntax-entry ?\. "w" c++-mode-syntax-table)

since the current behavior is actually correct for things like:

    f|oo.bar ()

I finally ended up with this solution:

    (setq forward-sexp-function 'my-forward-sexp-function)
    (defun my-forward-sexp-function (arg)
      (let ((forward-sexp-function nil))
        (forward-sexp arg))
      (when (and (eq (char-after) ?.)
                 (looking-back "[0-9]+" (line-beginning-position)))
        (skip-chars-forward "[0-9]")))

Is there any interest in making this behavior, i.e. treating each
floating point number as a single sexp, the default (or at least easily
customizable) in the core?


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