mediocregopher/ginger
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
4cde5179f1
ginger/gg/gg.bnf

26 lines
1.1 KiB
BNF
Raw Normal View History

Completely refactor gg with new BNF file and decoder The new gg format is based on a BNF file which can be found in the `gg` directory. The code for decoding `.gg` files has been refactored to mirror that file. The result is more resilient parsing, better errors, and a greater ability to extend the format in the future. The new decoder is notable in that it does not use a lexer. Both lexing and parsing are done in a single step. The format syntax itself has also been modified. Rather than using semi-colons everywhere, commas are used as separators in tuples. Additionally the final comma/semi-colon is no longer required.
2023-10-21 15:42:31 +00:00
<digit> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
<positive-number> ::= <digit>+
<negative-number> ::= "-" <positive-number>
<number> ::= <negative-number> | <positive-number>
Builtins start with exclamation point
2023-10-29 20:42:41 +00:00
<name-head> ::= <letter> | <mark> | "!"
<name-tail> ::= <name-head> | <digit>
<name> ::= <name-head> <name-tail>*
Completely refactor gg with new BNF file and decoder The new gg format is based on a BNF file which can be found in the `gg` directory. The code for decoding `.gg` files has been refactored to mirror that file. The result is more resilient parsing, better errors, and a greater ability to extend the format in the future. The new decoder is notable in that it does not use a lexer. Both lexing and parsing are done in a single step. The format syntax itself has also been modified. Rather than using semi-colons everywhere, commas are used as separators in tuples. Additionally the final comma/semi-colon is no longer required.
2023-10-21 15:42:31 +00:00
<tuple> ::= "(" <tuple-tail>
<tuple-tail> ::= ")" | <tuple-open-edge>
<tuple-open-edge> ::= <value> <tuple-open-edge-value-tail>
| <tuple> <tuple-open-edge-tail>
<tuple-open-edge-tail> ::= ")" | "," <tuple-tail>
<tuple-open-edge-value-tail> ::= <tuple-open-edge-tail> | "<" <tuple-open-edge>
<graph> ::= "{" <graph-tail>
<graph-tail> ::= "}" | <name> "=" <graph-open-edge>
<graph-open-edge> ::= <value> <graph-open-edge-value-tail>
| <tuple> <graph-open-edge-tail>
<graph-open-edge-tail> ::= "}" | ";" <graph-tail>
Break grammar parsing utilities into their own package
2023-10-27 14:14:37 +00:00
<graph-open-edge-value-tail> ::= <graph-open-edge-tail> | "<" <graph-open-edge>
Completely refactor gg with new BNF file and decoder The new gg format is based on a BNF file which can be found in the `gg` directory. The code for decoding `.gg` files has been refactored to mirror that file. The result is more resilient parsing, better errors, and a greater ability to extend the format in the future. The new decoder is notable in that it does not use a lexer. Both lexing and parsing are done in a single step. The format syntax itself has also been modified. Rather than using semi-colons everywhere, commas are used as separators in tuples. Additionally the final comma/semi-colon is no longer required.
2023-10-21 15:42:31 +00:00
<value> ::= <name> | <number> | <graph>
<gg> ::= <eof> | <value> <gg>
Reference in New Issue Copy Permalink