| lexer‑file | → | declaration* |
| declaration | → | class‑map | usings | tokens | keywords | expressions | lexer |
| class‑map | → | classmap id ; |
| usings | → | using‑directives |
| using‑directives | → | using‑directive+ |
| using‑directive | → | using‑alias‑directive | using‑namespace‑directive |
| using‑alias‑directive | → | using identifier = qualified‑id ; |
| using‑namespace‑directive | → | using qualified‑id ; |
| tokens | → | tokens id { (token % ,)? } |
| token | → | ( id , string ) |
| keywords | → | keywords id { (keyword % ,)? } |
| keyword | → | ( string , id ) |
| expressions | → | expressions { expression* } |
| expression | → | id = expr‑string ; |
| expr‑string | → | string |
| lexer | → | lexer id { (lexer‑clause)* } |
| lexer‑clause | → | expr‑string action compound‑statement | variables | actions |
| variables | → | variables { variable* } |
| variable | → | type‑expr id ; |
| actions | → | actions { action = compound‑statement* } |
| action | → | $ ( integer ) | <empty> |