The best way to write IDE helper tool

[unDEFER]

Hello!
I know there is IDE tools like DCD, but I don't like it because 
it hasn't UCFS-suggestions.
So I have written my own patches to DMD to decide this problem. 
The patches adds the "-interp" option to compiler. In this mode 
the compiler is interrupted after semantic3 stage and displays 
the next prompt:

INTERPRETER MODE

Write here short commands like:
<modulename>:line - as the first line to setup scope of the 
command
pragma(msg, "message");
templatename!(args)();
<empty line> - to start interpreter
exit - to finish interpreter mode

Also the patches adds 2 traits "isUFCSCallable" and 
"locationOfDeclaration".
All is good, my text editor calls after changes the modified dmd 
and writes to it's stdin short programs like this:

import std.algorithm.searching: startsWith;
static if (__traits(compiles, rhs.stringof.startsWith("module ")) 
&&
     rhs.stringof.startsWith("module "))
     allMembersOfModule!("rhs");
else static if (__traits(compiles, isType!(rhs)) && isType!(rhs))
     allMembersOfType!(rhs, "aliasthis");
else static if (__traits(compiles, typeof(rhs)))
     allMembersOfType!(typeof(rhs), "aliasthis");
else static if (__traits(compiles, typeof(rhs())))
     allMembersOfType!(typeof(rhs()), "aliasthis");
else pragma(msg, "Can't find type of expression");

To find what to suggest after a user writes "rhs.". 
allMembersOfModule and allMembersOfType declared in my 
autocompletion_routines module and inserts in each module by 
other new option of the modified compiler "-importtoall=".

So the problem of this approach is that the parsing of whole 
project is performed after EVERY edit of code.
What I want is to make "interp" mode better and add command to 
insert/remove lines to it's AST.
I see that I need to add to AST also fields like "dependencies" 
("using") to each declaration.. But seems there will problems 
with approach which uses the compiler. It rewrites "foreach" as 
"for" if it not in template and so on.. Don't sure that after 
this changes will be possible easy change lines in AST.

libdparse also doesn't work for me. It doesn't do CTFE so limits 
to UCFS suggestion like "isRange" will not work.

How you see what the best existing tools can help me finish this 
task?