Compute complexity statistics about idldoc HOT 3 CLOSED

r617 adds basic cyclomatic complexity calculations. There are user-defined limits with the COMPLEXITY_CUTOFFS keyword. The complexity computation should be further refined because currently it will parse comments and string literals while also not counting CASE and SWITCH statements correctly.

from idldoc.

There is a better IDL code parser now in the complexity calculation and modified cyclometric complexity is now computed as well. But to get the complexity right, a full IDL parser (or more heuristics) is needed because the : indicating a case in a SWITCH or CASE statement is also used in the ternary operator, a label, and array indexing.

from idldoc.

8e0dd39 adds bracket level as a heuristic to determine what type of : is used. Problems with this approach:

1. misses ternary operators inside parentheses or square brackets
2. counts labels, but this might be a good idea to count towards complexity since a label is generally used with GOTO or ON_IOERROR as a target to jump to

This is not perfect, but I think that a full IDL parser would not be worth it.

from idldoc.