fix: fix Parenthesis closure

Prevent adding automatic parenthesis when expression already contains parenthesis

Author: bugwheels94

Diff for: dist/browser/math-expression-evaluator.min.js

@@ -442,9 +442,12 @@ Mexp.lex = function (inp, tokens) {
     if (cType === 0) {
       allowed = type0
       asterick = empty
-      inc(ptc, 2).push(2)
+      inc(ptc, 2)
       str.push(obj)
-      str.push(openingParObj)
+      if (nodes[i + 1].type !== 4) {
+        str.push(openingParObj)
+        ptc.push(2)
+      }
       // bracToClose++
     } else if (cType === 1) {
       if (pre.type === 1) {
@@ -507,9 +510,13 @@ Mexp.lex = function (inp, tokens) {
     if (cType === 8) {
       allowed = type0
       asterick = empty
-      inc(ptc, 4).push(4)
+      inc(ptc, 4)
       str.push(obj)
-      str.push(openingParObj)
+      // str.push(openingParObj)
+      if (nodes[i + 1].type !== 4) {
+        str.push(openingParObj)
+        ptc.push(4)
+      }
     } else if (cType === 9) {
       if (pre.type === 9) {
         if (pre.value === Mexp.math.add) {
@@ -556,9 +563,12 @@ Mexp.lex = function (inp, tokens) {
     } else if (cType === 12) {
       allowed = type0
       asterick = empty
-      inc(ptc, 6).push(6)
+      inc(ptc, 6)
       str.push(obj)
-      str.push(openingParObj)
+      if (nodes[i + 1].type !== 4) {
+        str.push(openingParObj)
+        ptc.push(6)
+      }
     } else if (cType === 13) {
       allowed = type1
       asterick = type3Asterick

Diff for: src/lexer.js

@@ -320,6 +320,10 @@ describe('Ading Token', function () {
     // console.log("PAGAL", a.eval("min(4,ceil(0.1*10))"))
     assert.equal(a.eval("min(4,ceil(0.011*100))"), 2)
   })
+  it('should also evaluate to correct two functions', function () {
+    // console.log("PAGAL", a.eval("min(4,ceil(0.1*10))"))
+    assert.equal(a.eval("ceil(min(4, 0.0801*100))"), 4)
+  })
 
   it('should tell to compllete expression', function () {
     a.addToken([