Skip to content

6.2. Yul Expressions#



YulExpression = (* variant: *) YulFunctionCallExpression
              | (* variant: *) YulLiteral
              | (* variant: *) YulPath;


(* Postfix unary operator *)
YulFunctionCallExpression = (* operand: *) YulExpression
                            (* open_paren: *) OPEN_PAREN
                            (* arguments: *) YulArguments
                            (* close_paren: *) CLOSE_PAREN;


YulArguments = ((* item: *) YulExpression ((* separator: *) COMMA (* item: *) YulExpression)*)?;


YulPaths = (* item: *) YulPath ((* separator: *) COMMA (* item: *) YulPath)*;


YulPath = (* item: *) YUL_IDENTIFIER ((* separator: *) PERIOD (* item: *) YUL_IDENTIFIER)*;


(* Introduced in 0.5.8 and deprecated in 0.7.0. *)
YUL_IDENTIFIER = «IDENTIFIER_START» («IDENTIFIER_PART» | ".")*;

YUL_IDENTIFIER = «IDENTIFIER_START» «IDENTIFIER_PART»*;


YulLiteral = (* variant: *) YUL_TRUE_KEYWORD (* Introduced in 0.6.2 *)
           | (* variant: *) YUL_FALSE_KEYWORD (* Introduced in 0.6.2 *)
           | (* variant: *) YUL_DECIMAL_LITERAL
           | (* variant: *) YUL_HEX_LITERAL
           | (* variant: *) HexStringLiteral
           | (* variant: *) StringLiteral;


YUL_DECIMAL_LITERAL = ("0" | ("1"…"9" "0"…"9"*)) (?!«IDENTIFIER_START»);


YUL_HEX_LITERAL = "0x" «HEX_CHARACTER»+ (?!«IDENTIFIER_START»);