GRAMMAR.txt

<program> ::= BEGIN <block> END

<block> ::= { <if-statement> | <loop> | <break> | <print> | <read> | <assignment> }

<if-statement> ::=  <if-keyword> <expression> <block> [ ELSE <block> ] END

<if-keyword> ::= IFZ | IFP | IFN

<loop> ::= LOOP <block> END

<break> ::= BREAK

<print> ::= PRINT <expression>

<read> ::= READ <var-name>

<assignment> ::= <var-nam> "=" <expression>

<expression> ::= <term> { <add-op> <term> }

<term> ::= <signed-factor> { <mul-op> <factor> }

<signed-factor> ::= [ add-op ] <factor>

<factor> ::= <integer> | <var-name> | "(" <expression> ")"

<var-name> ::= <ident-char> { <ident-char> }

<integer> ::= <digit> { <digit> }

<add-op> ::= "+" | "-"

<mul-op> ::= "*" | "/" | "%"

<ident-char> ::= "_" | "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" | "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"

<digit> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"