C-mode indentation doesn't work in mmm-mode with the Noweb class

[nrnrnr]

Using emacs 24, I'm trying to use mmm-mode with noweb and C code.
But the indentation is not working correctly.

Here's an example cut from a very large file:

thousands of lines here
<<johnny>>=
void f(int a) {
           return g(a);
     }          
@ 

Placing the cursor on return and calling c-indent-line doesn't accomplish anything.

I've tracked the problem as far as the c-in-literal function, which claims that this position occurs inside a string. Function c-in-literal calls widen, which is unfortunate, and my Emacs Lisp skills are not good enough to find a fluid let that would prevent that widen from going beyond the region in mmm-mode that contains the code in question.

Here's another example from a complete file:

% -*- mmm-noweb-code-mode: c-mode; -*-
just one line here

<<johnny>>=
int f(int a) {
              return z;
    }      
@ 

In this example, the failure mode on calling c-indent-line is different: c-in-literal returns the right thing, but a different error occurs: c-after-conditional: Wrong type argument: stringp, nil.

There's nothing obviously wrong with mmm-mode here; when indentation is asked for, it is correctly calling c-indent-line. But it is not working for its intended purpose. I would welcome some help figuring out how either mmm-mode or c-mode could be modified so they could work together.

[dgutov]

I've got rid of some Wrong type argument errors (hopefully all?), but the indentation is still going crazy, and CC Engine is a rabbit hole too deep to get into. Maybe you should just set mmm-noweb-code-mode to js-mode, its syntax is similar, and it's less crazy.

mmm-noweb.el still contains the traces of trying to make different code believe everything beyond the current subregion is whitespace (see mmm-space-other-regions and nearby), but I'm not sure what the exact goals were, and how far it progressed.

[nrnrnr]

I agree CC Engine is terrifying. 11,000 lines of elisp! I will have a go at js-mode.