A Bower packaged, Prolog-like logic programming language implemented in ES6 JavaScript.
<script src="bower_components/blueInGreen/src/parser.js"></script>
<script src="bower_components/blueInGreen/src/interpreter.js"></script>
<script>
// Create prolog code indicating mother child relations
var rulesText = 'mother_child(stephanie, thorne).' +
'mother_child(stephanie, kristen).' +
'mother_child(stephanie, felicia).';
// Lex and parse the prolog code into rules
var rules = parser(lexer(rulesText)).parseRules();
// Create a database holding the rules
var db = new Database(rules);
// Create a prolog query asking who is kristen's mother
var goalText = 'mother_child(X, kristen)';
// Lex and parse the prolog query
var goal = parser(lexer(goalText)).parseTerm();
// Obtain the X variable of the goal
var x = goal.args[0]; // variable X
// Run the query against the database of rules and print the results
for (var item of db.query(goal)) {
print(item);
print('value of X = ' + goal.match(item).get(x));
}
</script>The repository's name blueInGreen is inspired by the tune "Blue In Green" by Bill Evans and Miles Davis. The implementation is based off of the curiosity-driven prolog-interpreter.