+/**
+ * @description "or", like the regex `( f1 | f2 )` .
+ * It returns a function `f` of which the argument is`x`.
+ * if `f1(x)` is None, then `f` returns `f2(x)`. Otherwise,
+ * `F` returns `f1(x)`.
+ * @param f1 : 1st function to be compared
+ * @param f2 : 2nd function to be compared
+ * @returns:the combined function
+ */
+function orDo(f1, f2) {
+ return (x) => {
+ let f1x = (f1(x));
+ {
+ if (f1x._tag == "None") {
+ return f2(x);
+ }
+ else {
+ return f1x;
+ }
+ }
+ };
+}
+exports.orDo = orDo;
+/**
+* @description repeating matching function `f`
+* zero or more times, like the asterisk `*` in regex `f*` .
+* @param f : the function to be repeated 0+ times.
+* @returns:the combined function
+*/
+function zeroOrMoreDo(f) {
+ return (x) => {
+ var wrapped_old_x = { _tag: "Some", value: x };
+ var wrapped_new_x = wrapped_old_x;
+ while (wrapped_new_x._tag != "None") {
+ wrapped_old_x = wrapped_new_x;
+ wrapped_new_x = thenDo(wrapped_old_x, f);
+ }
+ ;
+ return wrapped_old_x;
+ };
+}
+exports.zeroOrMoreDo = zeroOrMoreDo;
+/**
+* @description Not. like the `^` inside regex of [^f].
+* returns a function `F(x)` such that if `f(x)` is `None`,
+* returns the x consuming a char; if `f(x)` is not None, F(x)
+* returns `None`.
+* @param f: the function forbidden to be matched.
+* @returns: combined function `F`.
+*/
+function notDo(f) {
+ return (x) => {
+ let wrapped_x = {
+ _tag: "Some",
+ value: x
+ };
+ let f_x = thenDo(wrapped_x, f);
+ if (f_x._tag != "None") {
+ return { _tag: "None" };
+ }
+ else {
+ return thenDo(wrapped_x, matchAny);
+ }
+ };
+}
+exports.notDo = notDo;
+/**
+ * if `x` is matched by `f` once, returns `f(x)`. Otherwise,
+ * returns x
+ * similar to `?` in regex `f?`.
+ * @param f : the function to be matched
+ * @returns return wrapped f(x)
+ */
+function zeroOrOnceDo(f) {
+ return (x) => {
+ var wrapped_old_x = { _tag: "Some", value: x };
+ var wrapped_new_x = thenDo(wrapped_old_x, f);
+ if (wrapped_new_x._tag != "None") {
+ return wrapped_new_x;
+ }
+ else {
+ return wrapped_old_x;
+ }
+ };
+}
+exports.zeroOrOnceDo = zeroOrOnceDo;
+function tokenize(input) {
+ var input_matchee_pair = toSome({ matched: "",
+ remained: input });
+ // integer = ([+]|[-])\d\d?
+ let integer = (x) => {
+ let wrapped_x = toSome(x);
+ let plusMinus = orDo(match1Char('+'), match1Char('-')); // ([+]|[-])
+ let d = matchRange('0', '9'); // \d
+ return thenDo(thenDo(thenDo(wrapped_x, zeroOrOnceDo(plusMinus)), d), zeroOrMoreDo(d));
+ };
+ console.log(input + ", result: ");
+ console.log(thenDo(input_matchee_pair, integer));
+ // TODO: id, string, space, basic operator, 3 marks: @, {, }.
+}
+exports.tokenize = tokenize;
+tokenize("+123");
+tokenize("123");
+tokenize("-123");
+tokenize(" 123");
+tokenize("c123");