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Added an EBNF grammar

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Emi Simpson 2022-03-10 20:28:55 -05:00
parent 74d19864f2
commit 92ad2bc118
Signed by: Emi
GPG key ID: A12F2C2FFDC3D847
1 changed files with 69 additions and 0 deletions
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grammar.ebnf Normal file
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<program> ::= { DeclarationStart <declaration> }
<declaration> ::= Type Symbol [ <typeargs> ] { Symbol } Assign <variant_decl> { VBar <variant_decl> }
| Struct Symbol { Symbol } Assign { <def_field> }
| Trait Symbol [ <typeargs> ] [ On <composite_type> ] Needs { <def_field> }
| Impl Symbol [ <typerags> ] On <composite_type> Colon <impl> { <impl> }
| Symbol <def>
<variant_declaration> ::= Symbol { <grouped_type> }
<full_type> ::= <composite_type> [ { Comma <composite_type> } Aro <full_type> ]
<composite_type> ::= <simple_type> { <grouped_type> }
<grouped_type> ::= <simple_type>
| OpenParen <full_type> CloseParen
<simple_type> ::= Symbol [ OpenSquareBracket <domain> CloseSquareBracket ]
<domain> ::= Int Range Int
| Int
<def_field> ::= Dot Symbol Colon <full_type>
<typeargs> ::= OpenSouareBracket <typearg> { , <typearg> } CloseSquareBracket
<typearg> ::= Symbol Colon <full_type>
<impl> ::= Dot Symbol { Symbol } Assign <expr>
<def> ::= Colon <full_type>
| { Symbol } Assign <expr>
<expr> ::= <tightexpr> { <tightexpr> }
| If <expr> <ifblock>
| <let> { <let> } In <expr>
| <infix_expr>
<tightexpr> ::= Literal
| { <multisymbol> }
| OpenParen <expr> CloseParen
<multisymbol> ::= Symbol { Dot Symbol }
<let> ::= Let Symbol Assign <expr>
<ifblock> ::= Is <case> { Comma <case> } [ Comma ]
| Then <expr> Else <expr>
<case> ::= <binding_pattern> Aro <expr>
<infix_expr> ::= <infix_rank2_expr> { <infix_rank1_op> <infix_rank2_expr> }
<infix_rank2_expr> ::= <infix_rank3_expr> { <infix_rank2_op> <infix_rank3_expr> }
<infix_rank3_expr> ::= <infix_rank4_expr> { <infix_rank3_op> <infix_rank4_expr> }
<infix_rank4_expr> ::= <infix_rank5_expr> { <infix_rank4_op> <infix_rank5_expr> }
<infix_rank5_expr> ::= <tightexpr> { <infix_rank5_op> <tightexpr> }
<infix_rank1_op> ::= Mult | Div | Mod
<infix_rank2_op> ::= Add | Sub
<infix_rank3_op> ::= Eq | NEq | LessThan | GreaterThan
<infix_rank4_op> ::= LAnd
<infix_rank5_op> ::= LOr
<binding_pattern> ::= Symbol <bp_innards>
| Literal
<bp_innards> ::= { <bp_field> }
| { <binding_pattern }
<bp_field> ::= Dot Symbol Assign <binding_pattern>