1 files changed, 74 insertions, 0 deletions
diff --git a/lib/statements.js b/lib/statements.js
new file mode 100644
index 0000000..b59c08f
--- /dev/null
+++ b/lib/statements.js
@@ -0,0 +1,74 @@
+var getStatementEvaluators = function(evaluate) {
+	return {
+		'statement-sequence': function(dataset, children, context) {
+			var retval = null;
+			children.forEach(function(child) {
+				retval = evaluate(child, context);
+			});
+			return retval;
+		},
+
+		'while': function(dataset, children, context) {
+			var condition = children[0];
+			var body = children[1];
+			while (evaluate(condition, context)) {
+				evaluate(body, context);
+			}
+		},
+
+		'compare': function(dataset, children, context) {
+			var operator = binaryOperators[dataset.op];
+			var lhs = evaluate(children[0], context);
+			var rhs = evaluate(children[1], context);
+			var result = operator(lhs, rhs);
+			return result;
+		},
+
+		'variable': function(dataset, children, context) {
+			return context[dataset.name];
+		},
+
+		'constant': function(dataset, children, context) {
+			return stringToType(dataset.val, dataset.type);
+		},
+
+		'branch': function(dataset, children, context) {
+			var condition = children[0];
+			var ifBody = children[1];
+
+			// else is optional
+			if (children.length > 2) {
+				var elseBody = children[2];
+			}
+
+			if (evaluate(condition, context)) {
+				return evaluate(ifBody, context);
+			} else if (elseBody) {
+				return evaluate(elseBody, context);
+			}
+		},
+
+		'assign': function(dataset, children, context) {
+			context[dataset.name] = evaluate(children[0], context);
+			return context[dataset.name];
+		},
+
+		'bin-op': function(dataset, children, context) {
+			var operator = binaryOperators[dataset.op];
+			var lhs = evaluate(children[0], context);
+			var rhs = evaluate(children[1], context);
+			return operator(lhs, rhs);
+		},
+
+		'return': function(dataset, children, context) {
+			return evaluate(children[0], context);
+		},
+
+		'print': function(dataset, children, context) {
+			var args = children.map(function(child) {
+				return evaluate(child, context);
+			});
+			console.log.apply(this, args);
+		}
+	};
+};