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grammar pseudo language
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| // https://gist.github.com/juliandavidmr/5c545f8cc1fe58d19986625a7a17f756 | |
| /* description: Parses end executes mathematical expressions. */ | |
| /* lexical grammar */ | |
| %lex | |
| %% | |
| \s+ /* skip whitespace */ | |
| [0-9]+("."[0-9]+)?\b return 'NUMBER' | |
| "true" return 'TRUE' | |
| "false" return 'FALSE' | |
| "not" return 'NOT' | |
| "and" return 'AND' | |
| "or" return 'OR' | |
| "def" return 'DEF' | |
| "end" return 'END' | |
| "println" return 'PRINTLN' | |
| [a-zA-Z_][a-zA-Z0-9_]* return 'ID' | |
| "%" return '%' | |
| "=" return 'ASSIGN' | |
| "==" return '=' | |
| "!=" return '<>' | |
| "<>" return '<>' | |
| "*" return '*' | |
| "/" return '/' | |
| "-" return '-' | |
| "+" return '+' | |
| ">" return '>' | |
| "<" return '<' | |
| ">=" return '>=' | |
| "<=" return '<=' | |
| "^" return '^' | |
| "(" return 'PAR_OPEN' | |
| ")" return 'PAR_CLOSE' | |
| "PI" return 'PI' | |
| "E" return 'E' | |
| ";" return 'SEMICOL' | |
| \"(?:\"\"|[^"])*\" return 'STRING' | |
| <<EOF>> return 'EOF' | |
| . return 'INVALID' | |
| /lex | |
| /* operator associations and precedence */ | |
| %left '%' | |
| %left '+' '-' | |
| %left '*' '/' | |
| %left '^' | |
| %left '>' '<' '>=' '<=' | |
| %left 'NOT' | |
| %left 'AND' 'OR' | |
| %left '=' '<>' | |
| %left UMINUS | |
| %start expressions | |
| %ebnf | |
| %% /* language grammar */ | |
| expressions | |
| : e EOF | |
| {return $1;} | |
| | FUNCTION EOF | |
| {return $1;} | |
| ; | |
| e | |
| : e '+' e | |
| {$$ = $1 + $3;} | |
| | 'NOT' e | |
| {$$ = !$2;} | |
| | e 'OR' e | |
| {$$ = $1 || $3;} | |
| | e 'AND' e | |
| {$$ = $1 && $3;} | |
| | e '=' e | |
| {$$ = $1 == $3;} | |
| | e '<>' e | |
| {$$ = $1 != $3;} | |
| | e '-' e | |
| {$$ = $1 - $3;} | |
| | e '*' e | |
| {$$ = $1 * $3;} | |
| | e '/' e | |
| {$$ = $1 / $3;} | |
| | e '>' e | |
| {$$ = $1 > $3;} | |
| | e '<' e | |
| {$$ = $1 < $3;} | |
| | e '>=' e | |
| {$$ = $1 >= $3;} | |
| | e '<=' e | |
| {$$ = $1 <= $3;} | |
| | e '^' e | |
| {$$ = Math.pow($1, $3);} | |
| | '-' e %prec UMINUS | |
| {$$ = -$2;} | |
| | PAR_OPEN e PAR_CLOSE | |
| {$$ = $2;} | |
| | e '%' | |
| {$$ = $1 / 100;} | |
| | TRUE | |
| {$$ = true;} | |
| | FALSE | |
| {$$ = false;} | |
| | NUMBER | |
| {$$ = Number(yytext);} | |
| | STRING | |
| {$$ = $1;} | |
| | IDENT | |
| {$$ = __data__[$1];} | |
| | E | |
| {$$ = Math.E;} | |
| | PI | |
| {$$ = Math.PI;} | |
| ; | |
| FUNCTION | |
| : DEF ID PAR_OPEN PAR_CLOSE | |
| SENTENCE* | |
| END | |
| { $$ = 'function ' + $2 + '(){' + $5 + '}' } | |
| ; | |
| SENTENCE | |
| | VAR_ASSIGN | |
| ; | |
| : PRINTLN e | |
| { $$ = 'echo ' + $e + ';' } | |
| ; | |
| VAR_ASSIGN | |
| : ID ASSIGN e | |
| { $$ = '$' + $1 + '=' + $3 } | |
| ; | |
| UNARY_OPERATOR | |
| : '&' | |
| | '*' | |
| | '+' | |
| | '-' | |
| | '~' | |
| | '!' | |
| ; | |
| // ---------------------------------------------------------------------------------------- | |
| %% | |
| // feature of the GH fork: specify your own main. | |
| // | |
| // compile with | |
| // | |
| // jison -o test.js --main that/will/be/me.jison | |
| // | |
| // then run | |
| // | |
| // node ./test.js | |
| // | |
| // to see the output. | |
| var assert = require("assert"); | |
| parser.main = function () { | |
| var inputs = [ | |
| ` | |
| def hello() | |
| println "dsasd" | |
| end | |
| `, ` | |
| def hello() | |
| a = 3 | |
| println "dsasd" | |
| end | |
| ` | |
| ]; | |
| for (var i = 0, l = inputs.length; i < l ; i++) { | |
| var rv = parser.parse(inputs[i]); | |
| console.log(inputs[i], " ==> ", rv); | |
| } | |
| // if you get past the assert(), you're good. | |
| console.log("tested OK"); | |
| }; | |
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