Split the library into smaller files

source/utils.js

@@ -0,0 +1,26 @@
+//legal identifiers can only begin with letters or underscore - can contain numbers otherwise
+const checkAlphaNumeric = (str) => {
+	if (!/^[_a-z][_a-z0-9]*$/i.test(str)) {
+		throw 'Unexpected string ' + str;
+	}
+};
+
+//eats a "block" from the tokens list
+const eatBlock = (tokens, pos) => {
+	while (tokens[pos++] && tokens[pos - 1] !== '}') {
+		if (tokens[pos] == '{') {
+			pos = eatBlock(tokens, pos);
+		}
+	}
+
+	if (tokens[pos - 1] !== '}') { //eat the final '}'
+		throw 'Expected \'}\' while eating block (found ' + tokens[pos - 1] + ')';
+	}
+
+	return pos;
+};
+
+module.exports = {
+	checkAlphaNumeric,
+	eatBlock,
+}