[texhax] [Tex Help] How can (La)TeX break word with underscores (_) at arbitary place?

[Wei_Hu at mtk.com.tw]

Dear all,

When I write design documents, review documents, or coding notes for a 
program project,
I always refer to function names, variable names, and class names in that 
program.
However, these types of strings can not be arranged by (La)TeX well.

For example,

A macro named 'SECONDARY_EXTSRAM_LARGEPOOL_NORMAL', (La)TeX doesn't know
how to break this string at the page margin. The final result I got shown 
below:

..........................................................................
..........................................................................
...................................... SECONDARY_EXTSRAM_LARGEPOOL_NORMAL
..........................................................................
..........................................................................

This is ugly.
Then I use some solutions I can find:

1) use \- to mark places where (La)TeX can break:

Ex: SECONDARY\-\_EXTSRAM\-\_LARGEPOOL\-\_NORMAL

However, this will make (La)TeX inserts a hyphen (-),
and still can not break at the middle of SECONDARY, EXTSRAM, LARGEPOOL, 
NORMAL.

Then the result will be:

..........................................................................
..........................................................................
...................................... SECONDARY_EXTSRAM_-
LARGEPOOL_NORMAL .............................
..........................................................................
..........................................................................

It is still not good.

2) I don't want the additional hyphen, so I use \discretionary{}{}{} 
instead of \-:

Ex: 
SECONDARY\discretionary{}{}{}\_EXTSRAM\discretionary{}{}{}\_LARGEPOOL\discretionary{}{}{}\_NORMAL

The effect of this method is almost the same with the one above, except 
the additional hyphen.
The result of this follows.

..........................................................................
..........................................................................
...................................... SECONDARY_EXTSRAM_
LARGEPOOL_NORMAL .............................
..........................................................................
..........................................................................

3) Use \path from path package (path.sty):

The effect of this method is completely the same with the one of method 2.

Ex: \path|SECONDARY_EXTSRAM_LARGEPOOL_NORMAL|

will produce

..........................................................................
..........................................................................
...................................... SECONDARY_EXTSRAM_
LARGEPOOL_NORMAL .............................
..........................................................................
..........................................................................

Even worse, this \path command conflicts with the listings package and the 
longtable packages.

Does anyone knows how can I break a special string at any character in it?
Maybe there is a package named forcebreak, and there is a command 
\forcebreakhere in it.

\usepackage{forcebreak}
....
........... \forcebreakhere{SECONDARY_EXTSRAM_LARGEPOOL_NORMAL} ......
....

Then the result is:

..........................................................................
..........................................................................
...................................... SECONDARY_EXT
SRAMLARGEPOOL_NORMAL .................
..........................................................................
..........................................................................

or

..........................................................................
..........................................................................
...... SECONDARY_EXTSRAMLARGEPOO
L_NORMAL ...................................................
..........................................................................

depends on the context.

Does such a package exist?
Or can I use some other methods to accomplish this?

Thanks very much.
Wei.


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