26 lines
1.1 KiB
BNF
26 lines
1.1 KiB
BNF
<digit> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
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<positive-number> ::= <digit>+
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<negative-number> ::= "-" <positive-number>
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<number> ::= <negative-number> | <positive-number>
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<name-head> ::= <letter> | <mark> | "!"
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<name-tail> ::= <name-head> | <digit>
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<name> ::= <name-head> <name-tail>*
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<tuple> ::= "(" <tuple-tail>
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<tuple-tail> ::= ")" | <tuple-open-edge>
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<tuple-open-edge> ::= <value> <tuple-open-edge-value-tail>
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| <tuple> <tuple-open-edge-tail>
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<tuple-open-edge-tail> ::= ")" | "," <tuple-tail>
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<tuple-open-edge-value-tail> ::= <tuple-open-edge-tail> | "<" <tuple-open-edge>
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<graph> ::= "{" <graph-tail>
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<graph-tail> ::= "}" | <name> "=" <graph-open-edge>
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<graph-open-edge> ::= <value> <graph-open-edge-value-tail>
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| <tuple> <graph-open-edge-tail>
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<graph-open-edge-tail> ::= "}" | ";" <graph-tail>
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<graph-open-edge-value-tail> ::= <graph-open-edge-tail> | "<" <graph-open-edge>
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<value> ::= <name> | <number> | <graph>
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<gg> ::= <eof> | <value> <gg>
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