How could i parse string and link its model with my files in eclipse project?

How could i parse string and link its model with my files in eclipse project?, as i read that we dont have to use standalone mode while working with eclipse projects.
Example of what i want to do:
I have file1.dsl in my project which contains some statements but the declaration of these statements are not in another file, i need to put them only in my code

Hi Stefan,
I have eclipse project contains 2 files, file1.dsl and file2.dsl, you can see the contents of the files below.
file1.dsl contains some statements as shown below and file2.dsl contains the declarations of the variables. (like in C++ or Java we have declarations and usage)
At this step file1.dsl and file2.dsl will be parsed successfully without any errors.
Lets imagine that we will delete this project and will create another one and the new project will contain only file1.dsl (which contains the usage)
At this step this file (file1.dsl) will contains some errors after parsing it, because we are using variables without declarations.
So what i need is to parse the content of file2.dsl directly without adding this file to the project.
I need to add the content of file2.dsl directly as a string in the code and parse it. just like that ( "int a;int b;" )
And link file1.dsl with the model generated after parsing my string
file1.dsl
a++;
b++;
file2.dsl
int a;
int b;
Thanks

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