9 lines
538 B
Text
9 lines
538 B
Text
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<syntax> ::= <rule> | <rule> <syntax>
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<rule> ::= <opt-whitespace> "<" <rule-name> ">" <opt-whitespace> "::=" <opt-whitespace> <expression> <line-end>
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<opt-whitespace> ::= " " <opt-whitespace> | ""
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<expression> ::= <list> | <list> <opt-whitespace> "|" <opt-whitespace> <expression>
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<line-end> ::= <opt-whitespace> <EOL> | <line-end> <line-end>
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<list> ::= <term> | <term> <opt-whitespace> <list>
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<term> ::= <literal> | "<" <rule-name> ">"
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<literal> ::= '"' <text> '"' | "'" <text> "'"
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