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Difference between revisions of "MoDisco/Components/JSP/Architecture/0.9"

(Grammar Architecture)
(Non XML Conformity)
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===Non XML Conformity===
 
===Non XML Conformity===
  
The JSP Grammar take in consideration the non XML conformity of a JSP file.
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The JSP Grammar takes in consideration the non XML conformity of a JSP file.
 
Knowing that it can contain html or javascript tags, an opened tag is not necessarily closed by one
 
Knowing that it can contain html or javascript tags, an opened tag is not necessarily closed by one
  

Revision as of 09:05, 23 July 2010

DEPRECATED use Template:MoDiscoTabs and Template:MoDiscoTab as explain here : Wiki Template for MoDisco

JSP Parser

Modisco JSP Parser has been developed using an ANTLR grammar.

It can support JSP file, as well as HTML files, TAG files, and JSP/TAG fragment files

Grammar Architecture

The ANTLR grammar is composed with rules representing what could be founded in a JSP file :

The root element for the grammar is "Page", which is basically a JSP file.

A "Page" can contain JSP items, as well as Doctype declarations, comments, CData items or simply HTML tags

Tags are the basic elements to describe a JSP file. A tag can contain xml-like attributes, possibly composed with JSP elements.

Updating the Grammar

Non XML Conformity

The JSP Grammar takes in consideration the non XML conformity of a JSP file. Knowing that it can contain html or javascript tags, an opened tag is not necessarily closed by one

Example : <img src="./img/myImage.png">

In order to build the inheritance tree, we had to store all the found tags, and each time a closing one is detected, rebuild the inheritance tree.

Example : <p> <img src="./img/myImage.png"> </p>

This fragment of code will add the <img> tag to the children of the <p> tag when </p> is detected, and so on.

User Code in the generated one

Because we do not know if a tag will be closed later in the code, we had to manually implement some text concatenation.

Let's say we meet a new opening tag:

<p> This is some HTML content </p>

We cannot declared a rule "'<p>' 'any letter' '</p>'" because </p> might never appears, or a JSP expression could be there. That is why we concatenate manually the potentially present content after an opening tag, and wait till we found a known token.

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