IDE Customization

I write a lot of code in a not so popular language (Oracle .psp known as PL/SQL Server Pages).   Also, I’ve modified the language with a customized preprocessor which makes coding very nice and easy.
 

So I need an editor which can handle something like this:

<style>
Css code
Css code
 

Css code

</style>

Html code  Html code

Html code  # embedded oracle variable# Html code Html code

Html code Html code

<script>

Javascript code

Javascript code

Javascript code

Javascript code

</script>

<pl>

Oracle pl/sql code

Oracle pl/sql code  

Oracle pl/sql code

Oracle pl/sql code

<ht>

Back into html code

Back into html code

Back into html code

</ht>

Oracle pl/sql code

Oracle pl/sql code

</pl>

Html code

Html code

Html code

Within the html code block, oracle variables can be embedded, such as #url.pagename#, much like coldfusion.

The code is preprocessed and compiled with a dos .bat file which can produce error with line and column numbers.

How difficult is it to create a new file type which has understanding of the different block types: css, html, javaScript and pl/sql?