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| <h1 id="JSP_Parser">JSP Parser</h1> |
| <p>Modisco JSP Parser has been developed using an ANTLR grammar.</p> |
| <p>It can support JSP file, as well as HTML files, TAG files, and JSP/TAG fragment files</p> |
| <h2 id="Grammar_Architecture">Grammar Architecture</h2> |
| <p>The ANTLR grammar is composed with rules representing what could be founded in a JSP file : </p> |
| <p>The root element for the grammar is "Page", which is basically a JSP file.</p> |
| <p>A "Page" can contain JSP items, as well as Doctype declarations, comments, CData items or simply HTML tags</p> |
| <p>Tags are the basic elements to describe a JSP file. A tag can contain xml-like attributes, possibly composed with JSP elements.</p> |
| <h2 id="Updating_the_Grammar">Updating the Grammar</h2> |
| <h3 id="Non_XML_Conformity">Non XML Conformity</h3> |
| <p>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</p> |
| <p>Example : |
| <code> <img src="./img/myImage.png"> </code></p> |
| <p>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.</p> |
| <p>Example :</p> |
| <pre> |
| <p> |
| <img src="./img/myImage.png"> |
| </p> |
| </pre> |
| <p>This fragment of code will add the <img> tag to the children of the <p> tag when </p> is detected, and so on.</p> |
| <h3 id="User_Code_in_the_generated_one">User Code in the generated one</h3> |
| <p>Because we do not know if a tag will be closed later in the code, we had to manually implement some text concatenation.</p> |
| <p>Let's say we meet a new opening tag:</p> |
| <pre> |
| <p> |
| This is some HTML content |
| </p> |
| </pre> |
| <p>We cannot declare a rule "'<p>' 'any letter' '</p>'" because </p> might never appear, 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.</p> |
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