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Move grammar def. to README

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This commit is contained in:
Daniel M 2022-01-29 21:54:05 +01:00
parent 5cc89b855a
commit b7872da3ea
2 changed files with 17 additions and 15 deletions
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17
README.md
View File

@ -46,3 +46,20 @@
- [ ] IO Intrinsics - [ ] IO Intrinsics
- [ ] Print - [ ] Print
- [ ] ReadLine - [ ] ReadLine
## Grammar
### Expressions
```
expr_primary = LITERAL | "(" expr p | "-" expr_primary | "~" expr_primary
expr_mul = expr_primary (("*" | "/" | "%") expr_primary)*
expr_add = expr_mul (("+" | "-") expr_mul)*
expr_shift = expr_add ((">>" | "<<") expr_add)*
expr_rel = expr_shift ((">" | ">=" | "<" | "<=") expr_shift)*
expr_equ = expr_rel (("==" | "!=") expr_rel)*
expr_band = expr_equ ("&" expr_equ)*
expr_bxor = expr_band ("^" expr_band)*
expr_bor = expr_bxor ("|" expr_bxor)*
expr = expr_bor
```

15
src/parser.rs
View File

@ -73,21 +73,6 @@ pub enum Ast {
UnOp(UnOpType, Box<Ast>), UnOp(UnOpType, Box<Ast>),
} }
/*
## Grammar
### Expressions
expr_primary = LITERAL | "(" expr p | "-" expr_primary | "~" expr_primary
expr_mul = expr_primary (("*" | "/" | "%") expr_primary)*
expr_add = expr_mul (("+" | "-") expr_mul)*
expr_shift = expr_add ((">>" | "<<") expr_add)*
expr_rel = expr_shift ((">" | ">=" | "<" | "<=") expr_shift)*
expr_equ = expr_rel (("==" | "!=") expr_rel)*
expr_band = expr_equ ("&" expr_equ)*
expr_bxor = expr_band ("^" expr_band)*
expr_bor = expr_bxor ("|" expr_bxor)*
expr = expr_bor
*/
struct Parser<T: Iterator<Item = Token>> { struct Parser<T: Iterator<Item = Token>> {
tokens: Peekable<T>, tokens: Peekable<T>,
} }