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Digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" .
Letter = "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" .
Special = "_" .
Character = Digit | Letter | "!" | " " | "#" | "$" | "%" | "'" | "(" | ")" | "*" | "+" | "," | "," | "-" | "." | "/" | "[" | "]" | "\" | "^" | "_" | "`" | "{" | "|" | "}" | "~" .
Number = Digit { Digit } .
String = """ { Character | """ """ } """ | "'" .
Identifier = Letter { Letter | Digit | Special } .
QualifiedIdentifier = Identifier [ "." Identifier ] .
Factor = [ "+" | "-" ] Number | String | Designator | "(" Expression ")" | ( "not" Factor ) .
Designator = QualifiedIdentifier { Selector } .
Selector = ArrayDereference .
ArrayDereference = "[" Expression "]" .
Term = Factor { ( "*" | "/" | "and" ) Factor } .
SimpleExpression = Term { ( "+" | "-" | "or" ) Term } .
RelationalOperator = "=" | "<>" | "<" | ">" | "<=" | ">=" .
Expression = SimpleExpression [ RelationOperator SimpleExpression ].
VariableName = Identifier .
Assignment = Designator ":=" Expression .
StatementList = Statement { ";" Statement }
IfStatement = "if" Condition "do" StatementList "else" StatementList "end" .
ParameterList = "(" [ Expression { "," Expression } ] ")" .
ProdecureCall = QualifiedIdentifier ParameterList .
ForStatement = "for" identifier ":=" Expression "to" Expression "do" StatementList "end" .
WhileStatement = "while" expression "do" StatementList "end" .
ReturnStatement = "return" expression .
Statement = Assignment | IfStatement | ForStatement | WhileStatement | ProcedureCall | ReturnStatement .
StatementBlock = "begin" StatementList "end" .
VariableName = Identifier .
SimpleType = Identifier .
ArrayType = "array" [ Number ] "of" Type .
Type = SimpleType | ArrayType .
VariableDeclaration = VariableName ":" Type .
VariableBlock = "var" { VariableDeclaration ";" } .
ConstExpression = Expression .
ConstDeclaration = Identifier "=" ConstExpression .
ConstBlock = "const" { ConstDeclaration ";" } .
ImportBlock = "import" Identifier { "," Identifier } .
ParameterDeclaration = [ "(" [ Parameter { ";" Parameter } ] ")" ] [ ":" SimpleType ] .
Parameter = ident ":" ParameterType .
ParameterType = [ "array" "of" ] Type .
ProcedureDeclaration = "procedure" Identifier [ ParameterDeclaration ] ";" DeclarationBlock StatementBlock .
DeclarationBlock = [ ConstBlock ] [ VariableBlock ] { ProcedureDeclaration ";" } .
Module = "module" Identifier ";" [ ImportBlock ] DeclarationBlock StatementBlock .
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