+/**
+ *
+ * # PARSER UNITS
+ */
+function toSome(x) {
+ return { _tag: "Some", value: x };
+}
+/**
+ * like `m ==> f` in ocaml
+ * @param m matchee wrapped
+ * @param f matching function
+ * @returns wrapped result
+ */
+function thenDo(m, f) {
+ if (m._tag == "None") {
+ return m;
+ }
+ else {
+ var a = f(m.value);
+ if (a._tag == "Some") {
+ a.value.ast = m.value.ast.concat(a.value.ast);
+ }
+ return a;
+ }
+}
+/**
+ *
+ * @param m : the `TokenPair` to be consumed.
+ * @returns if the length of `m.remained` >= 1; consumes the matchee by 1 token
+ * and wraps it in `Some`,
+ * otherwise, returns `None`.
+ */
+function matchAny(m) {
+ if (m.remained.length >= 1) {
+ return {
+ _tag: "Some", value: {
+ matched: m.matched.concat(m.remained[0]),
+ remained: m.remained.slice(1),
+ ast: [m.remained[0]],
+ }
+ };
+ }
+ else {
+ return { _tag: "None" };
+ }
+}
+exports.matchAny = matchAny;
+/**
+ * like `f1 | f2` in regex
+ * @param f1 the first tried function
+ * @param f2 the second tried function
+ * @returns wrapped result
+ */
+function orDo(f1, f2) {
+ return (x) => {
+ let res1 = f1(x);
+ if (res1._tag == "Some") {
+ return res1;
+ }
+ else {
+ let res2 = f2(x);
+ return res2;
+ }
+ };
+}
+/**
+ * like regex [^c]
+ * @param f input token function. one token only.
+ * @returns combined finction
+ */
+function notDo(f) {
+ return (x) => {
+ let res1 = f(x);
+ if (res1._tag == "Some") {
+ return { _tag: "None" };
+ }
+ else {
+ let res2 = matchAny(x);
+ return res2;
+ }
+ };
+}
+function matchToken(typeName, value) {
+ return (t) => {
+ let headToken = t.remained[0];
+ if (headToken.type != typeName) {
+ return { _tag: "None" };
+ }
+ else {
+ if (value === undefined || value == headToken.value) {
+ let newTokenPair = {
+ matched: t.matched.concat(headToken),
+ remained: t.remained.slice(1),
+ ast: [headToken]
+ };
+ return { _tag: "Some", value: newTokenPair };
+ }
+ else {
+ return { _tag: "None" };
+ }
+ }
+ ;
+ };
+}
+;
+/**
+ *
+ * # TEST
+ */
+const tokens = Array.from((0, js_tokens_1.default)(`import; foo from\t 'bar';