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align grammar with parser by introducing PipeElement #82

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align grammar with parser by introducing PipeElement #82

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c5ebf8b
introduce a new PipeElement, unify code with grammar.md
WindSoilder Sep 23, 2026
6d03f6d
update snapshot
WindSoilder Sep 23, 2026
e6d4fb2
fmt code
WindSoilder Sep 23, 2026
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18 changes: 10 additions & 8 deletions contributing/grammar.md
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Original file line number Diff line number Diff line change
Expand Up @@ -27,10 +27,12 @@ terminator → NEWLINE | ";" ;
statement → declaration
| loop_statement
| flow_statement
| assignment
| pipeline ;

pipeline → pipe_element (pipe pipe_element)* ;
| pipeline_or_expression_or_assignment;
pipeline_or_expression_or_assignment
→ pipeline | pipe_element | assignment ;
pipeline_or_expression
→ pipeline | pipe_element ;
pipeline → pipe_element (pipe pipe_element)+ ;
pipe_element → expression_command redirection* ;
pipe → "|" | "e>|" | "err>|" | "out+err>|" | "err+out>|" ;
redirection → file_redirection expression ;
Expand All @@ -49,8 +51,8 @@ declaration → let_decl | mut_decl | const_decl | def_decl | extern_decl
| export_decl | export_env_decl | hide_decl | overlay_decl
| plugin_use_decl ;

let_decl → "let" binding "=" pipeline ;
mut_decl → "mut" binding "=" pipeline ;
let_decl → "let" binding "=" pipeline_or_expression ;
mut_decl → "mut" binding "=" pipeline_or_expression ;
const_decl → "const" binding "=" expression ;
binding → variable_decl type_annotation? ;
variable_decl → "$"? IDENTIFIER ;
Expand Down Expand Up @@ -153,9 +155,9 @@ addition → multiply (("+" | "-") multiply)* ;
multiply → power (("*" | "/" | "//" | "mod") power)* ;
power → unary ("**" power)? ; // right-associative
unary → ("not" | "+" | "-") unary | postfix ;
postfix → primary cell_path? ;
postfix → simple_expression cell_path? ;

primary → if_expression | try_expression | match_expression
simple_expression → if_expression | try_expression | match_expression
| literal | variable | cell_path_literal | table | list | closure
| record | block | subexpression ;
subexpression → "(" statement_sequence? ")" ;
Expand Down
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