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99 Commits

Author SHA1 Message Date
greg dd2b4893a4 Get rid of Separator token 
Have separate newline and semicolon tokens
 2017-09-19 22:10:54 -07:00
greg 51745fd800 Make convenience macro for parse errors 2017-09-19 22:10:54 -07:00
greg 8c0ac19fa8 Add full test 
Test evaluate, tokenize, parser all at once
 2017-09-19 22:10:54 -07:00
greg 971ab9ba21 Implement paren expressions 2017-09-19 22:10:54 -07:00
greg 819fb3f58f Basic evaluator functionality 
Interpreter now works for simple arithmetic expressions
 2017-09-19 22:10:54 -07:00
greg 1c23329656 Add boilerplate for evaluation 
Just wires everything up, doesn't actually evaluate yet
 2017-09-19 22:10:54 -07:00
greg 6da20cbfaf Address compiler warnings 2017-09-19 22:10:54 -07:00
greg f48451125e Parsing arithmetic expressions works 
At the expense of an unnecessary move in lookahead()
 2017-09-19 22:10:54 -07:00
greg 06c3999430 Add expect_identifier function 
For utility
 2017-09-19 22:10:54 -07:00
greg 1af1589550 Make Parser class internally use IntoIterator 
And wrap the next() and peek() methods
 2017-09-19 22:10:54 -07:00
greg 32a90b8103 write expect 
and also make the ParseResult type more general so it can be used for
more things.
 2017-09-19 22:10:54 -07:00
greg 186c900920 Implement expect macro 
Seems like there's no way around passing in self manually
 2017-09-19 22:10:54 -07:00
greg 509ab80b9c I can now parse one thing 2017-09-19 22:10:54 -07:00
greg 247638c4db Get parsing REPL working 2017-09-19 22:10:54 -07:00
greg be98f8387e Add another test 2017-09-19 22:10:54 -07:00
greg 841b38d5b1 Add tokenization test 2017-09-19 22:10:53 -07:00
greg 16dfbb27d5 Use state features from simplerepl 2017-09-19 22:10:53 -07:00
greg 3af7e6a409 Refactoring Schala 
Gonna work on Schala in earnest now! Using the simplerepl crate instead
of a build-in REPL, temporarily dropping parsing and evaluation code.
 2017-09-19 22:10:53 -07:00
greg 123f388711 Rename language to "Schala" 2017-09-19 22:10:53 -07:00
greg bb349cda5f Fix newline tokenizing bug 
Still need to fix <statements> parsing because of the final newline
 2017-09-19 22:10:53 -07:00
greg caa331ecdc Read from file as well as repl 2017-09-19 22:10:53 -07:00
greg ae3a030ad8 Use iterative semantics for reduction 
Becuase if you try to make reduce() recursive you blow out the stack.

Incidentally, "let a = 0; while a < 999999; let a = a + 1 end" is a neat
thing to try at this stage of the game
 2017-09-19 22:10:53 -07:00
greg ddb09b453d Implement booleans 2017-09-19 22:10:53 -07:00
greg 9a4760d44f Implement while-reduction 2017-09-19 22:10:53 -07:00
greg eb5ce2ef9e Don't print newline for empty REPL result 2017-09-19 22:10:53 -07:00
greg b080ea7c81 Add if-statement evaluation 2017-09-19 22:10:53 -07:00
greg dffab8ae94 Fixed arg list parsing 2017-09-19 22:10:53 -07:00
greg 48ee6c9a75 Add function name to parse 2017-09-19 22:10:53 -07:00
greg 58d399dace More function parsing 2017-09-19 22:10:53 -07:00
greg 57ea1bae30 Preliminary addition of function blocks 2017-09-19 22:10:53 -07:00
greg e870d8172a Make = a keyword 2017-09-19 22:10:53 -07:00
greg 72b26755a7 Make ParseResult just a normal Result type 
No reason for it to be different
 2017-09-19 22:10:53 -07:00
greg 1416c9d444 Parse null as simple_expression 2017-09-19 22:10:53 -07:00
greg 5c79563e53 Reduce binop args before reducing full expr 2017-09-19 22:10:53 -07:00
greg c27c900e7f Add operators % and ** 
semantics for these are hard with floats handle later
 2017-09-19 22:10:53 -07:00
greg 50c5dbe96d Evaluate simple binops 
Woo this is kind of a neat milestone! I can now compute with this
language!
 2017-09-19 22:10:53 -07:00
greg be8c8b3343 Add paren test 2017-09-19 22:10:53 -07:00
greg b856023072 Fixed paren parsing 
also made error reporting a bit nicer
 2017-09-19 22:10:53 -07:00
greg 868373f409 use match syntax in simple_parse 2017-09-19 22:10:53 -07:00
greg 582a7fd6dc Make parse and tokens optional 2017-09-19 22:10:53 -07:00
greg a947ec3cb2 Add simple parsing test 2017-09-19 22:10:53 -07:00
greg 79619025ea Add directive to print precedence chart 2017-09-19 22:10:53 -07:00
greg 56b338a6a8 Move to global precedence table 2017-09-19 22:10:53 -07:00
greg 7d6f946e22 Fill out a few more precedences 2017-09-19 22:10:53 -07:00
greg 0da7f7e3a1 Fully fixed binop parsing 2017-09-19 22:10:53 -07:00
greg 19a344fa77 Fixed precedent-less binop parsing 2017-09-19 22:10:53 -07:00
greg 626a7f3861 Working on binop parsing 2017-09-19 22:10:53 -07:00
greg 8e3a571d67 .env dirctive to display environment 2017-09-19 22:10:53 -07:00
greg f88f115567 Environment persistent across repl loop 2017-09-19 22:10:53 -07:00
greg 08f1092b69 Variable lookup works 
Note this introduces a panic - if the AST node inserted into the
environment is not reduced, it throws an error when trying to look it up
 2017-09-19 22:10:53 -07:00