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47 Commits

Author SHA1 Message Date
greg 905431b33c Change name: ASTNode -> Statement 2017-09-19 22:10:58 -07:00
greg 2996198eff lookup_binding only needs &str 2017-09-19 22:10:58 -07:00
greg 06771979df Function bodies can contain statements now 2017-09-19 22:10:58 -07:00
greg f158b6c712 Converted to multiple-evaluator logic 
Now I have (basically) full single-step evaluation and it works fine
 2017-09-19 22:10:58 -07:00
greg 872e9ce7ee Make function binding a SideEffect 2017-09-19 22:10:58 -07:00
greg edf342e65a Add == operator 2017-09-19 22:10:58 -07:00
greg 6794d22f1d Run rustfmt on eval.rs, parser.rs 2017-09-19 22:10:58 -07:00
greg 1858d26638 Add comparison operators 
+  make operator evaluation more concise
 2017-09-19 22:10:58 -07:00
greg 84fbe73cf6 Add Lambda type 
And change name FuncNode -> FuncDefNode

Now function definition nodes reduce to a Lambda, which is not
reducible.
 2017-09-19 22:10:58 -07:00
greg 82c52ede48 Finish evaluating conditionals 2017-09-19 22:10:57 -07:00
greg 7f52b20d97 Conditional eval partway implemented 
Need to change the AST representation to support compound statements I
think
 2017-09-19 22:10:57 -07:00
greg 12fee6158c Vector'd expressions don't need to be boxed 2017-09-19 22:10:57 -07:00
greg 9cc9c5977d Fixed evaluation of function calls 
This bit still isn't quite small-step but maybe that's okay for
functions
 2017-09-19 22:10:57 -07:00
greg ed9d1312d1 Change representation of variables 2017-09-19 22:10:57 -07:00
greg 29d9e50311 All environment changes represented explicitly 
Start the work of rewriting the evluator to be a true small-step
evaluator - that is, all state changes are represented explicitly as
SideEffect types, and not as methods called on the evaluator, except at
the very top of the evaluation loop
 2017-09-19 22:10:57 -07:00
greg af45004afa Run rustfmt on some files 2017-09-19 22:10:57 -07:00
greg db52f9b716 Package compilation context into one struct 2017-09-19 22:10:57 -07:00
greg a01b6c874e Small-step function arg evaluation 2017-09-19 22:10:57 -07:00
greg 907af38f44 Evaluate printing 2017-09-19 22:10:57 -07:00
greg 8528c912bd Added side effect framework 2017-09-19 22:10:57 -07:00
greg 0e3aaa8b08 Add conditional expression support 2017-09-19 22:10:56 -07:00
greg f33cfdadfe Fix variable lookup order 
Evaluator uses frames as a stack, so to find the most-recent variable
binding we have to iterate through it the reverse way. This fixes a bug
manifested by:

fn a(x)
 x + 20
end

fn b(x)
 a(x) + 20
end
 2017-09-19 22:10:56 -07:00
greg f014c1a9d9 Kill compiler warnings 2017-09-19 22:10:56 -07:00
greg c36bc3377e Fix lookup_binding in function call case 2017-09-19 22:10:56 -07:00
greg 5eba222679 Variable binding in fucntion call work 2017-09-19 22:10:56 -07:00
greg dcf89aa429 Move lookup_function back onto Evaluator 
THe problem was that we were borrowing the output of the inner HashMap,
if we clone it we don't borrow anything
 2017-09-19 22:10:56 -07:00
greg 1ffbeb6472 Return last value out of function 2017-09-19 22:10:56 -07:00
greg f8a521fc9b Start making function calls work 
This commit isn't fully done yet
 2017-09-19 22:10:56 -07:00
greg 77f72806be Add support for multiple frames 2017-09-19 22:10:56 -07:00
greg dcde5d6018 Start function call reduction 
Move the varmap and funcmap functions to the Evaluator, to mkae it
easier to facilitate separate frames
 2017-09-19 22:10:56 -07:00
greg 6bb227d052 Rename methods 
make reduce() the entry point to evaluation
 2017-09-19 22:10:56 -07:00
greg 29d4cb53a4 Add infrastructure to do function evaluation 
Right now you can successfully evaluate a function definition (returning
Null), but cannot call a function
 2017-09-19 22:10:56 -07:00
greg 3915c1f035 Remove println from reduction 2017-09-19 22:10:56 -07:00
greg b400796e4d Get rid of test variable input 2017-09-19 22:10:56 -07:00
greg 96e6a87f64 Add string concat 2017-09-19 22:10:56 -07:00
greg b1f9e5cefc Fix variable lookup 2017-09-19 22:10:56 -07:00
greg be36d4697d Pretty-print evaluated AST nodes 2017-09-19 22:10:56 -07:00
greg ce8c511929 Evaluate additional operators 2017-09-19 22:10:55 -07:00
greg 229e6ae733 More expression parsing work 2017-09-19 22:10:55 -07:00
greg e9dd0d9ae8 Add concept of Null expression 
Finally, the null-only behavior is starting to manifest itself!
 2017-09-19 22:10:55 -07:00
greg 7114e446a4 Adding, subtracting works 2017-09-19 22:10:55 -07:00
greg 044f534ac5 Start implementing variable lookup 2017-09-19 22:10:55 -07:00
greg d3207ad890 Move evaluation logic back into methods 
They need to be able to access the environment which is stored in the
Evalator struct
 2017-09-19 22:10:55 -07:00
greg 19fffd5063 Variable binding infrastructure 2017-09-19 22:10:55 -07:00
greg 785c916ece Start reducing ASTs 
Start writing code to reduce AST nodes
q
 2017-09-19 22:10:55 -07:00
greg 5a9ebb188d Make Evaluable trait 2017-09-19 22:10:55 -07:00
greg 16e8d969be Add basic evaluation 2017-09-19 22:10:55 -07:00