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25 lines
894 B
Text
25 lines
894 B
Text
keyword := 'if' | 'while' | 'until' | 'repeat' | 'for' | 'do' | 'break' |
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'print' | 'else' | 'end'
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identifier := /[a-zA-Z][[:alnum:]]+/
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number := /\d+/
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boolean-literal := 'true' | 'false'
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factor := '(' boolean-expression ')' | identifier | number
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signed-factor := '-' factor | '+' factor | factor
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term := signed-factor (/[*/]/ signed-factor)*
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arithmetic-expression := term (/[-+]/ term)*
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bit-op := '|' | '&' | '^'
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bit-expression := arithmetic-expression (bit-op arithmetic-expression)*
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rel-op := '==' | '!=' | '>' | '>=' | '<' | '<='
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relation := bit-expression (rel-op bit-expression)*
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boolean-factor := boolean-literal | relation
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not-factor := '!' boolean-factor | boolean-factor
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boolean-term := not-factor ('&&' not-factor)*
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boolean-expression := boolean-term ('||' boolean-term)*
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assignment := identifier '=' boolean-expression
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expression := assignment | boolean-expression
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