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mini-LISP
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A simple lisp interpreter
Download README (.md)
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README.md
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mini-LISP
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# mini-LISP ## Type Definiation * Boolean: **#t** for true and **#f** for false * Number: Signed integer from −( 2^31 ) to 2^31 * Function ## Operation | Name | Symbol | Example | | ---- | - | ----------- | | Plus | + | (+ 1 2) => 3 | | Minus| - | (- 1 2) => -1 | | Multiply | * | (* 2 3) => 6 | | Divide | / | (/ 6 3) => 2 | | Modulus | mod| (mod 8 3) => 2 | | Greater | > | (> 1 2) => #f | | Smaller | < | (< 1 2) => #t | | Equal | = | (= 1 2) => #f | | And | and | (and #t #f) => #f | | Or | or | (or #t #f) => #t | | Not | not | (not #t) => #f | | | define | | | fun | | | if | ## Lexical Details ``` separator [ \t\n\r] letter [a-z] digit [0-9] number 0|[1-9]{digit}*|-[1-9]{digit}* ID {letter}({letter}|{digit}|"-")* bool-val #[t|f] ``` ## Grammar and Behavior 1. Program ``` PROGRAM : STMT STMTS STMTS : STMT STMTS | {} STMT : EXP | DEF-STMT | PRINT-STMT ``` 2. Print ``` PRINT_STMT : '(' print_num EXP ')' | '(' print_bool EXP ')' ``` 3. Expression ``` EXPS : EXP EXPS | {} EXP : bool_val | number | VARIABLE | NUM_OP | LOGICAL_OP | FUN_EXP | FUN_CALL | IF_EXP ``` 4. Numerical Operations ``` NUM_OP : PLUS | MINUS | MULTIPLY | DIVIDE | MODULES | GREATER | SMALLER | EQUAL ``` 5. Logical Operations ``` LOGICAL_OP : AND_OP | OR_OP | NOT_OP ``` 6. Define statement ``` DEF_STMT : '(' define VARIABLE EXP ')' VARIABLE : id ``` 7. Function ``` FUN_EXP : '(' _fun FUN_ID FUN_BODY ')' FUN_ID : '(' VARIABLE VARIABLES ')' FUN_BODY : EXP FUN_CALL : '(' FUN_EXP PARAM PARAMS ')' | '(' FUN_NAME PARAM PARAMS ')' PARAM : EXP PARAMS : PARAM PARAMS VARIABLES: VARIABLE VARIABLES LAST_EXP : EXP FUN_NAME : id ``` 8. If Expression ``` IF_EXP : '(' _if TEST_EXP THAN_EXP ELSE_EXP ')' TEST_EXP: EXP THAN_EXP: EXP ELSE_EXP: EXP ```
