Added let-exprs to grammar, and fixed patterns
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13
grammar.txt
13
grammar.txt
@ -3,7 +3,7 @@ expression ->
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// | apply
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| unary
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| binary
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// | let
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| let
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| compound
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| control
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| field
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@ -17,16 +17,19 @@ 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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| "|>" | "<|" | ">>" | "<<"
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| "++" ;
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pattern -> "_" | record_pattern | variant_pattern | identifier ;
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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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let -> "let" pattern "=" expression ( "and" 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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variant_pattern -> "`" identifier ( "(" ( ( "_" | identifier ) ( "," ( "_" | identifier )* )? ) ")" )? ;
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when -> "when" expression "is" ( variant_pattern "=>" expression )+ ;
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when -> "when" expression "is" ( pattern "=>" expression )+ ;
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compound -> variant | record | list ;
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variant -> "`" identifier ( "(" ( expression ( "," expression)* )? ")" )? ;
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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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