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[gobo-eiffel-develop] Graphviz, Licensing, Tabs
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From: Roger B. <ro...@ei...> - 2001-05-29 13:26:28
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> LICENSE
>
> The files in the Gobo Eiffel package are released under
> the Eiffel Forum Freeware License.
Perhaps you could consider using the Eiffel Forum License rather than the
Eiffel Forum Freeware License.
The EFL arose out of discussions on the "forum-discuss" list last year,
to rework the EFFL so that it could be submitted to OSI for certification
as an "OSI-certified Open Source" license.
The changes are small. Here is the EFL:
Eiffel Forum License, version 1
Permission is hereby granted to use, copy, modify and/or distribute
this package, provided that:
- copyright notices are retained unchanged
- any distribution of this package, whether modified or not,
includes this file
Permission is hereby also granted to distribute binary programs which
depend on this package, provided that:
- if the binary program depends on a modified version of this
package, you must publicly release the modified version of this
package
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT WARRANTY. ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE TO ANY PARTY FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THIS PACKAGE.
Sadly, OSI gives priority to discussing corporate licenses (such as those
from Sun and IBM), and the Eiffel Forum License is still on the waiting
list more than a year after submission. But there is no doubt that the
EFL meets the requirements for OSI certification.
> Graphviz could probably be used to generate class inheritance
> graphs. Graphiz is an open source graph drawing software...
At first I was surprised that you were not suggesting GraVis, which is
more powerful and more elegant than Graphviz, and is written in Eiffel.
Then, I checked the GraVis website again. When Tower dropped their Eiffel
customers, the authors rewrote GraVis in Java. Sad but true.
When it was released in 1977, GraVis was ahead of its time. It we'd had
Gobo cross-vendor libraries back then, it could have been switched to one
of the other Eiffel compilers and we would now have a famous Eiffel
application.
> > And perhaps a sed script to convert existing code to tab format.
>
> ... I think the
> ! best choice for platform independent language in
> ! the context of the development of Gobo Eiffel
> ! package is ... Eiffel. What do you think?
>
> If you want to write such tool, please do.
In the meantime, you can use Franck Arnaud's little utility to:
1. Check that lines are indented with tabs, not spaces
2. Check that tabs do not appear other than at the start of a line
3. Check that double-spaces do not appear within Eiffel text
It's released to the public domain, and it's so short that I've just
pasted it in here.
Personally, I prefer indents of 3-spaces, because I've not yet found a
way to tell Netscape that tabs are less than 8 characters (to avoid
line-wrapping). Sure, you can tell emacs that tabls are 3 characters, but
much software is not configurable and assumes 8 characters.
Regards,
Roger
===
-- chktab: Check correct usage of spaces and tabs (in Eiffel)
-- Public Domain (may be copied, modified and sold freely)
--
-- Detected errors:
-- * Tab(s) not at the beginning of line: tabs in the middle of the text
-- are dependent on user setup and not necessary in Eiffel.
-- * Double spaces are redundant too (spaces at the beginning of lines
are
-- tabs). Double spaces are ignored inside comments.
--
-- FA 1996-09-24
indexing
description: "Simple program to check correct usage of tabs and
spaces"
licence: public_domain
version: "1996-09"
class CHECK_TAB inherit ARGUMENTS end
creation make
feature { NONE }
Usage : STRING is "usage: chktab <in"
feature
make is
-- Root procedure.
do
if argument_count > 0 then
io.put_string(Usage)
io.put_new_line
else
-- process stdin
from
line := 1
until
io.end_of_file -- portability
issue
loop
io.read_line
check_line(io.last_string)
line := line + 1
end
end
end
feature { NONE } -- Attribute(s)
line,column : INTEGER
feature { NONE }
check_line(str : STRING) is
-- Check one line.
require
valid_str: str /= Void
local
in_comment : BOOLEAN
do
from
column := 1
variant
str.count + 1 - column
until
column > str.count
loop
-- misplaced tabs
if column > 1 then
-- detect comment
if str.item(column) = '-' and
str.item(column-1) = '-' then
in_comment := true
end
-- tabs
if str.item(column) = '%T' and
str.item(column-1) /= '%T' then
error("tab(s) not at the
beginning of line")
end
-- double spaces
if not in_comment then
if str.item(column) = ' '
and str.item(column-1) = ' ' then
error("double
spaces")
end
end
end
column := column + 1
end
end
error(msg : STRING) is
-- Print error message.
require
ok: msg /= Void
do
io.put_string("-:")
io.put_integer(line)
io.put_character(':')
io.put_integer(column)
io.put_character(':')
io.put_string(msg)
io.put_new_line
end
end -- class CHECK_TAB
===
--
Roger Browne - ro...@ei... - Everything Eiffel
19 Eden Park Lancaster LA1 4SJ UK - Phone +44 1524 32428
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