+ ;
+ return ret;
+};
+let facAux2 = callees;
+let facAux = orDo(facAux1, facAux2);
+/** fac = single facAux | single
+ * Issue1 to be fixed.
+ */
+let fac1 = (x) => {
+ var ret = thenDo(thenDo(tk.toSome(x), single), facAux);
+ if (ret._tag == "Some") {
+ console.log("777" + repr(tkTreeToSExp(ret.value.ast)));
+ ret.value.ast = [applyToken, ret.value.ast[ret.value.ast.length - 2],
+ ret.value.ast[ret.value.ast.length - 1]];
+ ret.value.ast;
+ rearrangeTree(ret.value.ast);
+ console.log("888" + repr(tkTreeToSExp(ret.value.ast)));
+ }
+ return ret;
+};
+let fac2 = single;
+let fac = orDo(fac1, fac2);
+/**
+ * rearrangeTree : for applyToken subtree from right-combination to
+ * left-combination
+ * @input x a ast
+ * @return another ast
+ */
+function rearrangeTree(x) {
+ if (x !== undefined) {
+ for (var i = 1; i < x.length; i++) {
+ rearrangeTree(x[i]);
+ }
+ console.log("@@" + repr(x[0]));
+ if (x[0] == applyToken) {
+ if (Array.isArray(x[2]) && x[2][0] == applyToken) {
+ let rl = rearrangeTree(x[2][1]);
+ let rr = rearrangeTree(x[2][2]);
+ let l = rearrangeTree(x[1]);
+ x[0] = applyToken;
+ x[1] = [applyToken, l, rl];
+ x[2] = rr;
+ console.log("@@==" + repr(x));
+ return x;
+ }
+ else {
+ x[0] = applyToken;
+ x[1] = rearrangeTree(x[1]);
+ x[2] = rearrangeTree(x[2]);
+ console.log("@@==" + repr(x));
+ return x;
+ }
+ }
+ return x;
+ }
+}
+/**
+ *
+ * term1 = fac (MUL | DIV) fac
+ */
+let term1 = midfix((x) => thenDo(thenDo(thenDo(tk.toSome(x), fac), orDo(tMul, tDiv)), fac), "term1");
+/**
+ *
+ * term2 = int MUL int
+ */
+let term2 = fac;
+/**
+ * term = term1 | term2
+ */
+let term = orDo(term1, term2);
+/**
+ *
+ * expr1 = term ADD term
+ */
+let expr1 = midfix((x) => thenDo(thenDo(thenDo(tk.toSome(x), term), orDo(tAdd, tSub)), term), "expr1");
+/**
+ * expr2 = term
+ */
+let expr2 = term;
+/**
+ * expr = expr1 | expr2
+ */
+let expr = orDo(expr1, expr2);
+let tokens = tk.tokenize("1");
+let tokens2 = tk.tokenize("1(2)");
+let tokens3 = tk.tokenize("1(2)(3)");
+let tokens4 = tk.tokenize("2()");
+//let tokens = tk.tokenize("(4-(3/4))");
+//tk.tokenize(argv[2]);
+let tokensFiltered = tokens4.filter((x) => {
+ return (x.type != tk.TokenType.NL
+ && x.type != tk.TokenType.SP);
+});
+let beta = expr({
+ matched: [],
+ remained: tokensFiltered,
+ ast: []
+});
+if (beta._tag == "Some") {
+ beta.value.ast = rearrangeTree(beta.value.ast);
+ console.log(tkTreeToSExp(beta.value.ast));