43 lines
1.6 KiB
Plaintext
43 lines
1.6 KiB
Plaintext
expression ->
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| sequence
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| apply
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| unary
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| binary
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| let
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| compound
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| control
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| selector
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| index
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| identifier
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| primary
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grouping -> "(" expression ")" ;
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unary -> ( "-" | "!" ) expression ;
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binary -> expression operator expression ;
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operator ->
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| "==" | "!=" | "<" | "<=" | ">" | ">="
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| "+" | "-" | "*" | "/"
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| "++" ;
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pattern -> "_" | record_pattern | variant_pattern ;
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record_pattern -> "{" ( identifier ( "=" pattern )? ( "," identifier ( "=" pattern )? )* ) ( "|" identifier ) "}"
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variant_pattern -> "`" identifier ( "(" ( "_" | compound_pattern | identifier ) ")" )? ;
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parameters -> "(" ( identifier ( "," identifier )* )?")"
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let -> "let" ( identifier parameters? | pattern ) "=" expression ( "and" ( identifier parameters? | pattern ) "=" expression )* "in" expression ;
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control ->
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| if
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| when
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if -> "if" expression "then" expression "else" expression ;
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when -> "when" expression "is" ( ( identifier | pattern ) "=>" expression )+ ;
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compound -> variant | record | list ;
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variant -> "`" identifier ( "(" expression ")" )? ;
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base_record -> expression ( "with" identifier "=" expression ( "," "with" identifier "=" expression )* )?
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record ->
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"{" ( identifier ("=" expression)? ( "," identifier ("=" expression)? )* )? ( "|" base_record )* "}" ;
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list -> "[" ( expression ( "," expression )* )? "]" ;
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identifier -> IDENTIFIER | "@" STRING ;
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operand -> ( NUMBER | STRING | identifier | "(" expression ")" ) ;
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selector -> "." identifier ;
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index -> "[" expression "]" ;
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arguments -> "(" ( "_" | expression ( "," ( "_" | expression ) )* )? ")" ;
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primary -> operand ( selector | index | arguments ) ;
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