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177 Commits

Author SHA1 Message Date
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 231de69084 Added infrastructure for reading files 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 a8cafa8c64 Move Evaluator state into interpreter state 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 15d4317191 Add null expression 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
greg 70bf68d9bd More concision in parser 2017-09-19 22:10:55 -07:00
greg f53c14535b Made error! macro more programtic 
TODO implement Display on Token so we're not just displaying the debug
name of the token enum variants
 2017-09-19 22:10:55 -07:00
greg 4f96abd7d9 Changes to make the code more concise 2017-09-19 22:10:55 -07:00
greg fdaf4c302c Fix all compiler warnings 2017-09-19 22:10:55 -07:00
greg 8ce53d7c72 Fix bind error 2017-09-19 22:10:55 -07:00
greg 428d560e2a Add tests for call expr parsing 2017-09-19 22:10:55 -07:00
greg 80bc7ec089 Proper call expression parsing 2017-09-19 22:10:55 -07:00
greg e6591b80d9 Add paren test 2017-09-19 22:10:55 -07:00
greg e099f713ad Add binop parsing test 2017-09-19 22:10:55 -07:00
greg 9b54256521 Import types for breivty 
and rename function to be explicit
 2017-09-19 22:10:55 -07:00
greg 087402ece6 Add more tests 
Need to use box patterns
 2017-09-19 22:10:55 -07:00
greg 252b6e8bd9 Okay, this strategy makes the test work 2017-09-19 22:10:55 -07:00
greg b1163e2ae4 Operator-precedence parsing + tests 
The tests are crippled now, because it's hard to write a test macro that
can also match on Strings
 2017-09-19 22:10:55 -07:00
greg 032d01c9f5 Fix tokenization bug 2017-09-19 22:10:55 -07:00
greg c4ab1ed105 Fix tokenizer tests 2017-09-19 22:10:55 -07:00
greg 9a257f08d7 Introduce Op type 
For operator parsing
 2017-09-19 22:10:55 -07:00
greg 47d56a7b44 fix operator parsing 2017-09-19 22:10:55 -07:00
greg 1f7ae2e30f Paren expression 2017-09-19 22:10:55 -07:00
greg e3c8753a4d Expression parsing 2017-09-19 22:10:55 -07:00
greg e1aa7ecb17 Finish tokenizing Op separately 2017-09-19 22:10:55 -07:00
greg f09a6e14ba Tokenizer work to support operators 
work in progress but committing to transfer
 2017-09-19 22:10:55 -07:00