Pop has it's own error message.
Div should be "floor" division
> fdiv rounds q down towards -infinity, and r will have the same sign as
> d. The f stands for “floor”.
https://gmplib.org/manual/Integer-Division
And some protection for inscribe, empty quotes or quotes that do not
have a symbol at the first item are just consumed without affecting the
user defs.
Because the Gperf wordlist is checked before the user defs hash the
inscribe command cannot overwrite the commands defined in the wordlist.
This is only part of the solution, we still need to update joy.h and
KEYWORDS.txt when defs.txt changes, and we need to handle names that
have non-C-identifier characters in them.
But it's a start...
There are things to like about this implementation and things to
dislike.
Things to like:
- It works.
- The defs are baked into the wordlist.
Cons:
- The def bodies are built at start time by parsing strings. it would
be nice to somehow generate initializer literals if possible. But
would that mess up the garbage collector?
- It requires manual labor to update the defs when defs.txt changes. It
would be nice to have a solution that *make* can use.
C has function pointers, we can put them in the Gperf wordlist, this
makes the interpreter really simple. No need for a dictionary (yet).
Implementing the basis functions will be a bit of a slog, and
I still have to implement definitions, but this is starting to shape up
nicely.
Simon Forman