54 lines
1.6 KiB
ABNF
54 lines
1.6 KiB
ABNF
; Rutile's grammar formal definition in ABNF
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; NOTES:
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; - terminal strings are by default case sensitive
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; - alternatives are ordered
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function-kind = "proc" / "iter"
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proc-decl = function-kind "(" [proc-decl-args] ")" ":" [ident] *stmt 'end'
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proc-decl-args = symbol-type-pair *("," symbol-type-pair)
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symbol-type-pair = ident ":" ident
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symbol-decl = ("var" / "let" / "const") ident-type-expr ; "Variable" declaration
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ident-type-expr = ident [":" ident] ["=" expr]
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function-call = ident-qualified "(" [funcargs] ")"
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funcargs = expr-list
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array-literal = "[" expr-list "]"
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expr-list = expr *("," expr) [","] ; Allows a trailling comma
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expr = number
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/ array-literal
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/ function-call
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pragma = "#" "[" "]" ; TODO
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decorated-decl = pragma (proc-decl / symbol-decl)
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; Statements
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while-stmt = "while" expr *stmt "end"
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if-expr = "if" expr *stmt "end"
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break-expr = "break" *expr
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return-stmt = "return" *expr
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yield-stmt = "yield" *expr
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loop-control = "next" / break-expr
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stmt = proc-decl
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/ expr
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/ loop-control
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/ if-expr
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/ while-stmt
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/ return-stmt
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/ yield-stmt
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ident = (ALPHA / "_") *(ALPHA / DIGIT / "_" / "?" / "!")
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; Identifier accounting for namespacing: std:io.print, aaa:bbb:ccc
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ident-qualified = (ALPHA / "_") *(ALPHA / DIGIT / "_" / "?" / "!" / ":" / ".")
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OCTDIGIT = %x30-37
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number = 1*DIGIT ; Decimal
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/ "0b" 1*("0" / "1") ; Binary
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/ "0o" 1*OCTDIGIT ; Octal
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/ "0x" 1*HEXDIGIT ; Hexadecimal
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escape = "\" ("\" / DQUOTE / "0" / "a" / "b" / "n" / "r" / "t" / ("x" 1*2HEXDIGIT))
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character = OCTET / escape
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string-literal = DQUOTE *character DQUOTE
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