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Home » Modeling » M2T (model-to-text transformation) » [Acceleo3]Generating a C macro definition(adding end of line continuation)
icon5.gif  [Acceleo3]Generating a C macro definition [message #654865] Thu, 17 February 2011 13:29 Go to next message
Wilbert Alberts is currently offline Wilbert AlbertsFriend
Messages: 212
Registered: June 2010
Senior Member
Hi,

I'm working on an Acceleo 3 model to text generator that will output 'C' code. In this, I need to generate macro definitions. You know that if a macro definition spans multiple lines, it needs to end each line with the '/' line continuation character.

As the templates I invoke are also used outside the macro definition generation, I thought about adding the '/' at the end of the lines by using a post directive in the macro definition template.

The post (like post(trim())) directive should take the resulting string and replace each '\n' occurrence into a '\\\n'. However this does not seem to work as the replacements don't take place in results or internal template invocations.

Any ideas how to solve this elegantly?

Greetings,
Wilbert.

[Updated on: Thu, 17 February 2011 13:34]

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Re: Generating a C macro definition [message #654867 is a reply to message #654865] Thu, 17 February 2011 13:33 Go to previous messageGo to next message
Christian Dietrich is currently offline Christian DietrichFriend
Messages: 14735
Registered: July 2009
Senior Member
Hi,

which m2t framework do you use?

~Christian


Twitter : @chrdietrich
Blog : https://www.dietrich-it.de
Day Job: https://www.everest-systems.com
Re: Generating a C macro definition [message #654869 is a reply to message #654867] Thu, 17 February 2011 13:35 Go to previous messageGo to next message
Wilbert Alberts is currently offline Wilbert AlbertsFriend
Messages: 212
Registered: June 2010
Senior Member
Acceleo 3
Embarrassed changed the subject

Thanks,
Wilbert.
Re: [Acceleo3]Generating a C macro definition [message #655090 is a reply to message #654865] Fri, 18 February 2011 10:00 Go to previous messageGo to next message
Stephane Begaudeau is currently offline Stephane BegaudeauFriend
Messages: 458
Registered: April 2010
Location: Nantes (France)
Senior Member

Hi,

If [template public myTemplate() post(replaceAll('\n', '\\\n'))] [/template] does not work:
- are you on linux ? (on windows, you would need \r\n for example)
- does [myTemplate().replace('\n', '\\\n')/] instead works ?

Stephane Begaudeau, Obeo

--
Twitter: @sbegaudeau
Acceleo wiki: http://wiki.eclipse.org/Acceleo
Blogs: http://stephanebegaudeau.tumblr.com & http://sbegaudeau.tumblr.com
Re: [Acceleo3]Generating a C macro definition [message #655101 is a reply to message #655090] Fri, 18 February 2011 10:29 Go to previous messageGo to next message
Wilbert Alberts is currently offline Wilbert AlbertsFriend
Messages: 212
Registered: June 2010
Senior Member
Hi Stephane,

First of all thanks for pointing me into the replaceAll direction.

However, it does not seem to work. It seems that '\\' is not recognized as:

[generateMacroStatement(m.statement).replaceAll('\n', ' -\\- \n')/] \

results in:
#define INIT_RESULT() \
{ \
result = OK; --
if (bla) --
{ --
result = !OK; --
} --
else --
{ --
FALSE = TRUE; --
} \
}

Any ideas?

Greetings,
Wilbert
Re: [Acceleo3]Generating a C macro definition [message #655465 is a reply to message #655101] Mon, 21 February 2011 09:54 Go to previous messageGo to next message
Laurent Goubet is currently offline Laurent GoubetFriend
Messages: 1902
Registered: July 2009
Senior Member
This is a multi-part message in MIME format.
--------------010706050700010900040008
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Hi Wilbert,

Acceleo's replaceAll operation relies on the
java.lang.String.replaceAll() implementation. The "replacement" part
thus treats backslashes specially. Furthermore, OCL, Acceleo, Java and
regex all use the backslash as an escape character ... so you might get
some pretty unusual results.

First things first, what do you have here?

replaceAll('\n', ' -\\- \n')

1) '\n' : this is interpreted by Acceleo before it is sent to Java, the
content of the String is then the -character- for a carriage return, not
the escape sequence. This will work just as well when passed to the
regex engine
2) ' -\\- \n' : once again, this will be interpreted by Acceleo. The
content of the Java String will then be " -\- <carriage return>". That
single backslash lying before a "-" cannot be interpreted by the regex
engine and will then be trimmed out of the result. However, the "\n"
will be interpreted as a carriage return and should give you separate
lines in the result.

Regex trivia aside, you should use :

[generateMacroStatement(m.statement).replaceAll('(\r\n|\r|\n )', ' -\\\\-
$1')/]

Notice the use of a quadruple backslash and "$1" instead of a plain "\n"...

'(\r\n|\r|\n)' : match any "line separator" sequence according to the OS
' -\\\\- $1' : "\\\\" will be interpreted by Acceleo and passed to Java
a simple "\\" which means, in a java.lang.String.replaceAll()
replacement string, "a single backslash". "$1" means "the first captured
group" which is equal to the line separator we matched in the first place.

I won't go into any more details here. Please read otherwise on Java
regular expressions and patterns.

Laurent Goubet
Obeo

On 18/02/2011 11:29, Wilbert Alberts wrote:
> Hi Stephane,
>
> First of all thanks for pointing me into the replaceAll direction.
>
> However, it does not seem to work. It seems that '\\' is not recognized as:
>
> [generateMacroStatement(m.statement).replaceAll('\n', ' -\\- \n')/] \
>
> results in:
> #define INIT_RESULT() \
> { \
> result = OK; -- if (bla) -- { -- result = !OK; -- } -- else -- { --
> FALSE = TRUE; -- } \
> }
>
> Any ideas?
>
> Greetings,
> Wilbert


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Re: [Acceleo3]Generating a C macro definition [message #655473 is a reply to message #655465] Mon, 21 February 2011 10:09 Go to previous message
Wilbert Alberts is currently offline Wilbert AlbertsFriend
Messages: 212
Registered: June 2010
Senior Member
Hi Laurent,

This does the trick! Thanks. (The '-' were only there for 'debugging' purposes.)

Greetings,
Wilbert.
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