[antlr-interest] Abstract tree parser

[Ron Hunter-Duvar]

If I understand what you're asking for, the simplest way is to give up 
on trying to declare the foo method abstract in IScriptTreeParser, and 
declare it as:

protected void foo() {}


Then you can override it in the subclasses you write. I know abstract is 
good because it forces you to redefine the method, but is it worth the 
extra pain?

If you really want to have the abstract, I think you'd either have to do 
it with some post-generation scripting, or modify Antlr to make it do 
this as an option (but that's probably overkill). On Linux, the 
following command should do the trick for you:

sed -ie 's/(public) (class IScriptTreeParser)/\1 abstract \2/' 
IScriptTreeParser.java

Ron


Christian Pontesegger wrote:
> On 25.02.2010 21:47,  Jim Idle wrote:
>   
>> tree grammar IScriptTreeParser;
>> options {
>>    language = Java;
>>    tokenVocab = IScript;
>>    ASTLabelType = CommonTree;
>>    SuperClass = AbstractIScriptTreeParser;
>> } 
>>   
>>     
>
> Still not what I'd like to have. I think I'll give it one more try:
>
> When finished I want to have following inheritance
>
> TreeParser <-- IScriptTreeParser <-- ConcreteTreeParser
> TreeParser <-- IScriptTreeParser <-- AnotherConcreteTreeParser
>
> TreeParser
>     *   is the ANTLR base class
>
> IScriptTreeParser is:
>     *    automatically generated from my treegrammar file
>     *    abstract public class IScriptCompiler extends TreeParser {... }
>         ----^^^
>     *    has some abstract methods defined in @members
>
> ConcreteTreeParser is:
>     *    some class I am doing on my own
>     *    implements abstract stuff from IScriptTreeParser
>
> AnotherConcreteTreeParser is:
>     *    some class I am doing on my own
>     *    different implementation of abstract methods
>
>
> so far I did not get a recommendation how to do that.
>
> any ideas?
> Christian
>    
>
>
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>   

-- 
Ron Hunter-Duvar | Software Developer V | 403-272-6580
Oracle Service Engineering
Gulf Canada Square 401 - 9th Avenue S.W., Calgary, AB, Canada T2P 3C5

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