75 lines
2.0 KiB
EBNF
75 lines
2.0 KiB
EBNF
input = {top level}.
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top level = load | decl.
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decl = namespace | def.
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(* top level semicolons are optional because all decls start with a
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special word. like in ocaml *)
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load = "load", STRING, [";"].
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namespace = "namespace", "{", {decl}, "}", [";"].
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def = def intro, NAME, [":", term], "=", term, [";"].
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def intro = "def0" | "defω" | "def", [qty, "."].
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(* "def" with no qty defaults to ω *)
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qty = "0" | "1" | "ω".
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dim = dim const | name.
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dim const = "0" | "1".
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dim arg = "@", dim.
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pat var = NAME | "_".
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term = lambda | case | pi | sigma | ann.
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lambda = ("λ" | "δ"), {pat var}+, "⇒", term.
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case = case intro, term, "return", case return, "of", case body.
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case intro = "case0" | "case1" | "caseω" | "case", qty, ".".
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case return = [pat var, "⇒"], term.
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case body = "{", {pattern, "⇒", term / ";"}, [";"], "}".
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pattern = "zero" | "0"
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| "succ", pat var, [",", qty, ".", pat var]
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| TAG
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| "[", pat var, "]"
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| "(", pat var, ",", pat var, ")".
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pi = qty, ".", (binder | term arg), "→", term.
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binder = "(", {NAME}+, ":", term, ")".
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sigma = (binder | ann), "×", (sigma | ann).
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ann = infix eq, ["∷", term].
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infix eq = app term, ["≡", term, ":", app term]. (* dependent is below *)
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app term = coe | comp | split universe | dep eq | succ | normal app.
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split universe = "★", NAT.
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dep eq = "Eq", type line, term arg, term arg.
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succ = "succ", term arg.
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normal app = term arg, {term arg | dim arg}.
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(* direction defaults to @0 @1 *)
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coe = "coe", type line, [dim arg, dim arg], term arg.
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type line = "[", [pat var, "⇒"], term, "]".
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comp = "comp", type line, [dim arg, dim arg],
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term arg, dim arg, comp body.
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comp body = "{", comp branch, ";", comp branch, [";"], "}".
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comp branch = dim const, name, "⇒", term.
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term arg = UNIVERSE
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| "{", {BARE TAG / ","}, [","], "}"
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| TAG
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| "[", [qty, "."], term, "]"
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| "ℕ"
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| "zero"
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| NAT
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| QNAME
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| "(", {term / ","}+, [","], ")".
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