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Chain processors - can we ?

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ch007m

Chain processors - can we ?

This post was updated on .

Hi

Can we chain the processors in such a way that BlockProcessor will be processed after the TreeProcessor ? The reason why I'm asking this question is because I would like to pospulate a hashMap using TreeProcessor and reuse it with the BlockProcessor

Example:

        // Include the Table extension
        asciidoctor.javaExtensionRegistry()
                .treeprocessor(FindRolesTreeProcessor.class)
                .block(GenerateTableBlockProcessor.class);
...

Best

Charles

Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

David Jencks

Re: Chain processors - can we ?

No. However the processors are registered has no effect on what stage of parsing they are called during.

David Jencks

On Apr 9, 2020, at 9:38 AM, ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:
Hi

Can we chain the processors in such a way that BlockProcessor will be processed after the TreeProcessor ?

Example:
        // Include the Table extension
        asciidoctor.javaExtensionRegistry()
                .treeprocessor(FindRolesTreeProcessor.class)
                .block(GenerateTableBlockProcessor.class);
...
Best

Charles

Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

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ch007m

Re: Chain processors - can we ?

So, How can I share a HashMap created by the TreeProcessor with the BlockProcessor ?

Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

David Jencks

Re: Chain processors - can we ?

I’m not familiar with the java API for the extension registry. If you really can only register a class rather than an instance as a processor, then I think you’ll need to use a static variable in one class, accessed by the other.

David Jencks

On Apr 9, 2020, at 9:46 AM, ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:

So, How can I share a HashMap created by the TreeProcessor with the BlockProcessor ?
Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

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Alexander Schwartz

Re: Chain processors - can we ?

The API allows to register instances of classes as well. One solution could be

create the HashMap
pass it to the constructor of each processor
register the processor instances

Regards, Alexander

Alexander Schwartz (alexander.schwartz@gmx.net)
https://www.ahus1.de

ch007m

Re: Chain processors - can we ?

I can share the HashMap using a static method between the classes. But, as we cannot define the order of the execution of the processors, then I must try to use another approach where I will use first a preprocessor to calculate the hashmap and next using a Blockprocessor to generate the table with the hashmap values

asciidoctor.javaExtensionRegistry()
                .preprocessor(FindRolesPreProcessor.class)
                .block(GenerateTableBlockProcessor.class);

Remark: the problem that I have is that we cannot use a document AST tree with the preprocessor but instead read lines to navigate ...

Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

David Jencks

Re: Chain processors - can we ?

If registering objects rather than classes is supported, I would use a single object implementing both interfaces.

You may not want to do it, but the sequence suggested by Dan of having a block processor first do something to locate where the table is going to be, either by inserting a table or, much easier, as I did, locating an existing table, and then having the tree processor add rows, will definitely work and IMO would be considerably simpler and more reliable than using a preprocessor. If you use a tree processor you can rely on asciidoctor actually correctly finding the structure of your document; if you use a preprocessor you are rewriting the parser, probably with bugs. I’m not sure what problem you see with this structure.

David Jencks

On Apr 9, 2020, at 11:50 AM, ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:
I can share the HashMap using a static method between the classes. But, as we cannot define the order of the execution of the processors, then I must try to use another approach where I will use first a preprocessor to calculate the hashmap and next using a Blockprocessor to generate the table with the hashmap values
asciidoctor.javaExtensionRegistry()
                .preprocessor(FindRolesPreProcessor.class)
                .block(GenerateTableBlockProcessor.class);
Remark: the problem that I have is that we cannot use a document AST tree with the preprocessor but instead read lines to navigate ...
Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

If you reply to this email, your message will be added to the discussion below:
https://discuss.asciidoctor.org/Chain-processors-can-we-tp7870p7876.html

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NAML

LightGuardjp

Re: Chain processors - can we ?

A preprocessor will be the first step in the chain of processors regardless.

On Thu, Apr 9, 2020 at 1:17 PM David Jencks [via Asciidoctor :: Discussion] <[hidden email]> wrote:

If registering objects rather than classes is supported, I would use a single object implementing both interfaces.

You may not want to do it, but the sequence suggested by Dan of having a block processor first do something to locate where the table is going to be, either by inserting a table or, much easier, as I did, locating an existing table, and then having the tree processor add rows, will definitely work and IMO would be considerably simpler and more reliable than using a preprocessor. If you use a tree processor you can rely on asciidoctor actually correctly finding the structure of your document; if you use a preprocessor you are rewriting the parser, probably with bugs. I’m not sure what problem you see with this structure.
David Jencks
On Apr 9, 2020, at 11:50 AM, ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:
I can share the HashMap using a static method between the classes. But, as we cannot define the order of the execution of the processors, then I must try to use another approach where I will use first a preprocessor to calculate the hashmap and next using a Blockprocessor to generate the table with the hashmap values
asciidoctor.javaExtensionRegistry()
                .preprocessor(FindRolesPreProcessor.class)
                .block(GenerateTableBlockProcessor.class);
Remark: the problem that I have is that we cannot use a document AST tree with the preprocessor but instead read lines to navigate ...
Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

If you reply to this email, your message will be added to the discussion below:
https://discuss.asciidoctor.org/Chain-processors-can-we-tp7870p7876.html

To start a new topic under Asciidoctor :: Discussion, [hidden email]
To unsubscribe from Asciidoctor :: Discussion, click here.
NAML
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Jason Porter
http://en.gravatar.com/lightguardjp

ch007m

Re: Chain processors - can we ?

In reply to this post by David Jencks

Can you share your example please where you locate an existing table using a BlockProcessor and then having the tree processor to add the rows ?

Question: Can we first use the treeProcessor to iterate through the document to create the HashMap and next use a BlockProcessor to insert a Table generated using the hashmap ?

Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

David Jencks

Re: Chain processors - can we ?

(moved to asciidoctor/asciidoctor gitter channel)

On Apr 9, 2020, at 12:51 PM, ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:

Can you share your example please where you locate an existing table using a BlockProcessor and then having the tree processor to add the rows ?

Question: Can we first use the treeProcessor to iterate through the document to create the HashMap and next use a BlockProcessor to insert a Table generated using the hashmap ?
Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

If you reply to this email, your message will be added to the discussion below:
https://discuss.asciidoctor.org/Chain-processors-can-we-tp7870p7880.html

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LightGuardjp

Re: Chain processors - can we ?

In reply to this post by ch007m

I don't have an example that does that. Ah, a treeprocessor and a block processor, I thought you had said a preprocessor. I'm not sure the relationship of when those are called. What do you need from the tree processor?

On Thu, Apr 9, 2020 at 1:51 PM ch007m [via Asciidoctor :: Discussion] <[hidden email]> wrote:

Can you share your example please where you locate an existing table using a BlockProcessor and then having the tree processor to add the rows ?

Question: Can we first use the treeProcessor to iterate through the document to create the HashMap and next use a BlockProcessor to insert a Table generated using the hashmap ?
Charles Moulliard
Apache Committer / Technologist Evangelist / Blogger / MiddleWare Specialist
Twitter : @cmoulliard

If you reply to this email, your message will be added to the discussion below:
https://discuss.asciidoctor.org/Chain-processors-can-we-tp7870p7880.html

To start a new topic under Asciidoctor :: Discussion, email [hidden email]
To unsubscribe from Asciidoctor :: Discussion, click here.
NAML

Jason Porter
http://en.gravatar.com/lightguardjp