greg
819fb3f58f
Basic evaluator functionality
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Interpreter now works for simple arithmetic expressions
2017-09-19 22:10:54 -07:00
greg
1c23329656
Add boilerplate for evaluation
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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
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At the expense of an unnecessary move in lookahead()
2017-09-19 22:10:54 -07:00
greg
06c3999430
Add expect_identifier function
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For utility
2017-09-19 22:10:54 -07:00
greg
1af1589550
Make Parser class internally use IntoIterator
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And wrap the next() and peek() methods
2017-09-19 22:10:54 -07:00
greg
32a90b8103
write expect
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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
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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
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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
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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
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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
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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 **
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semantics for these are hard with floats handle later
2017-09-19 22:10:53 -07:00
greg
50c5dbe96d
Evaluate simple binops
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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
greg
6ddea790c0
Beginning of variable lookup
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everything is null
2017-09-19 22:10:53 -07:00
greg
6897eb1283
Implemented variable binding
2017-09-19 22:10:53 -07:00
greg
34fdf2be00
Add machinery for evaluation environments
2017-09-19 22:10:53 -07:00
greg
4ef93fafb5
Cause tokenize error for unclosed strings
2017-09-19 22:10:53 -07:00
