[stringtemplate-interest] Re : Templates that get another templates as arguments?

[Matthieu Wipliez]

Hi Dmitry,

I think you could also use the indirect template expression:

hello(name) ::= <<
Hello, <(processName)(name)>
>>

This will call the template whose name is computed from processName.

Cheers
Matthieu




>________________________________
>De : Barrie Treloar <baerrach at gmail.com>
>À : Дмитрий Васильев <dmitry.vasil at gmail.com>
>Cc : stringtemplate-interest at antlr.org
>Envoyé le : Lundi 27 Juin 2011 1h55
>Objet : Re: [stringtemplate-interest] Templates that get another templates as arguments?
>
>2011/6/27 Дмитрий Васильев <dmitry.vasil at gmail.com>:
>> Consider the following example. I have a template that greets my friends:
>>
>> greet()::=<<
>> <hello("Bob")>
>> <hello("John")>
>> <hello("Kate")>
>> <hello("Barbara")>
>>>>
>>
>> hello(name)::=<<
>> Hello, <name>!
>>>>
>>
>> Sometimes I want print their names in bold:
>>
>> hello(name)::=<<
>> Hello, [b]<name>[/b]!
>>>>
>>
>> Sometimes I want to prepend their names with the word "dear":
>>
>> hello(name)::=<<
>> Hello, dear <name>!
>>>>
>>
>> Generally, I want to pass a template for handling various cases as an
>> argument to template 'greet()'. I want to be able to do something like this:
>>
>> greet(processName)::=<<
>> <hello("Bob")>
>> <hello("John")>
>> <hello("Kate")>
>> <hello("Barbara")>
>>>>
>>
>> hello(name)::=<<
>> Hello, <processName(name)>
>>>>
>>
>> bold(text)::=<<
>> [b]<text>[/b]
>>>>
>>
>> dear(name)::=<<
>> dear <name>
>>>>
>>
>> greet_in_bold()::=<<
>> <greet(processName=bold)>
>>>>
>>
>> greet_dear()::=<<
>> <greet(processName=dear)>
>>>>
>>
>> But I can't find how I can do something similar with StringTemplate. Do I
>> miss something obvious?
>
>I'm sorry that I dont have time to hack your scripts to show this
>working, I can only throw some comments over the wall and let you
>attempt them.
>Hopefully you will get a better answer but this may get you moving in
>the mean time.
>
>Your hello template can take another argument which is the template
>that will be applied.
>
>hello(name, processName)::=<<
>Hello, <processName(name)>
>>>
>
>Then greet becomes
>greet(processName)::=<<
><hello("Bob",processName)>
><hello("John",processName)>
><hello("Kate",processName)>
><hello("Barbara",processName)>
>>>
>
>Alternatively, apply the template outside of the hello template:
>
>Leave
>hello(name)::=<<
>Hello, <name>!
>>>
>
>And greet becomes
>greet(processName)::=<<
><hello(<processName("Bob")>)>
><hello(<processName("John")>)>
><hello(<processName("Kate")>)>
><hello(<processName("Barbara")>)>
>>>
>
>You may also be better off using a list to apply templates over, see
>http://www.antlr.org/wiki/display/ST4/StringTemplate+cheat+sheet
>
>(You may need to wrap this in a list []...)
>< "Bob", "John", "Kate", "Barbara" : { name |  greet(name, processName=bold)}>
>or
>< "Bob", "John", "Kate", "Barbara" : { name |  greet(<bold(name)>)}>
>Depending on which way you decide to go.
>
>Its too early in the morning to think about what the correct advice should be.
>I think one way is better than the other, for all the usual comp. sci.
>reasons of good design.
>_______________________________________________
>stringtemplate-interest mailing list
>stringtemplate-interest at antlr.org
>http://www.antlr.org/mailman/listinfo/stringtemplate-interest
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/stringtemplate-interest/attachments/20110627/fc06f5f2/attachment.html