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Assign ::= Identifier ":" Value
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Assign_Hidden ::= Variable ":" Value
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Identifier ::= PrintChar +
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Variable ::= "@" Identifier
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Bare_String ::= (GraphicChar | ("\" Char)) +
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Quoted_String ::= '"' ([^"\] | "\" Char) * '"'
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| "'" ([^'\] | "\" Char) * "'"
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Comment ::= '#' GraphicChar +
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Integer ::= [+-] ? ([1-9] Digit + | [0])
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Hex ::= [+-] ? "0" [xX] (Digit | [a-fA-F]) +
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Octal ::= [+-] ? "0" [0-7] +
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Float ::= [+-]? Digit+ ("." Digit +)? ([eE] [+-] ? Digit +)?
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Complex ::= ((Float | Integer) [+-])? (Float | Integer) "i"
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Duration ::= [+-] ? (Digit + ("." Digit +) ("ns" | "us" | "µs" | "ms" | "s" | "m" | "h")) +
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Numer ::= Integer | Hex | Octal | Float
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Object ::= "{" (Identifier ":" Value) + "}"
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List ::= "[" Value + "]"
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Value ::= String | Number | Duration | Variable | Object | List
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Heredoc ::= "<<" Identifier "\n" (Char | "\n") + "\n" "Identifier (same as opening identifier)" "\n"
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Letter ::= "a Unicode letter, category L"
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Mark ::= "a Unicode mark, category M"
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Digit ::= [0-9]
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Symbol ::= "a Unicode symbol character, category S"
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Space ::= "a Unicode space character, category Z, excluding \n"
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Punct ::= "a Unicode punctuation glyph, category P, excluding those described as terminal characters"
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Terminal ::= "[" | "]" | ";" | ":" | "{" | "}" | "\" | "#" | "\n"
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PrintChar ::= Letter | Mark | Number | Symbol | Punct
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GraphicChar ::= PrintChar | Space
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Char ::= GraphicChar | Terminal
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