Skip to main content
Jump to: navigation, search

MoDisco/Components/JSP/Architecture/0.9

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 :

Updating the Grammar

Non XML Conformity

The ANTLR Grammar take 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 founded tags, and each time closing one is detected, re build 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

on when

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.

Back to the top