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Diffstat (limited to 'res/syntax.ebnf')
| -rw-r--r-- | res/syntax.ebnf | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/res/syntax.ebnf b/res/syntax.ebnf new file mode 100644 index 0000000..85990c5 --- /dev/null +++ b/res/syntax.ebnf @@ -0,0 +1,47 @@ +letter_uppercase = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" | "J" | "K" | "L" | "M" + | "N" | "O" | "P" | "Q" | "R" | "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z" + ; + +letter_lowercase = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j" | "k" | "l" | "m" + | "n" | "o" | "p" | "q" | "r" | "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z" + ; + +letter = letter_uppercase | letter_lowercase + ; + +digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" + ; + +identifier = letter , { letter | digit } + ; + +numeral = digit | ( numeral , digit ) + ; + +variable = identifier + ; + +arithmetic_operation = "+" | "-" | "*" + ; + +arithmetic_expression = ( "(" , arithmetic_expression , arithmetic_operation , arithmetic_expression , ")" ) + | variable | numeral ; + +boolean_operation = "or" | "not" + ; + +relational_operation = "=" | "#" | "<" | "<=" | ">" | ">=" + ; + +boolean_expression = ( "(" , boolean_expression , boolean_operation , boolean_expression , ")" ) + | ( "not" , boolean_expression ) + | ( arithmetic_expression , relational_operation , arithmetic_expression ) + ; + +statement = "skip" + | ( variable , ":=" , arithmetic_expression ) + | ( "(" , statement , ";" , "statement" , ")" ) + | ( "if" , boolean_expression , "then" , statement , "else" , statement , "end" ) + | ( "while" , boolean_expression , "do" , statement , "end" ) + | ( "var" , variable , ":=", arithmetic_expression , "in" , statement , "end" ) + ;
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