Replacing parser technology: COP4020/compiler/parser.c) with a parser generated by the Lemon parser generator.

Replacing parser technology =========================== Your project is to replace Pleasant’s recursive descent parser (found in the accompanying tarfile in language-COP4020/compiler/parser.c) with a parser generated by the Lemon parser generator. While the canonical reference is the recursive descent parser in the tar file distributed with this assignment (it’s in language-COP4020/compiler/parser.c), a rough BNF-like grammar for Pleasant is also given below: “BNF-like” grammar for Pleasant =============================== ::= “main”


::=

|




::= “exports” “{”

“`”

::= “imports” “{”

“`”

::= “declarations” “{”

“`” ::= “program”


::= “functions “{”

“`”

::= “{”

“`”

::= ( <> |

“;” |

|

|

|

“;” |

)


::= “var”


::= (IDENTIFIER | identifier_list) “=”

“;”

::= “if” “(”

“)”

“else”


::= “while” “(”

“)”


::= IDENTIFIER


::= NUMBER | STRING | IDENTIFIER |


::= <> | “(” (

, )* “)”


::= <> | ( IDENTIFIER , )* IDENTIFIER

::= ( IDENTIFIER “;” )*

::= (

)*