fix: better parse sci notation with + and - (#55)

Author: evilebottnawi

lib/unit.js

@@ -22,6 +22,28 @@ module.exports = function(value) {
         break;
       }
       sciPos = pos;
+
+      var nextCode = value.charCodeAt(pos + 1);
+
+      if (
+        nextCode === plus ||
+        nextCode === minus ||
+        (nextCode >= 48 && nextCode <= 57)
+      ) {
+        if (nextCode === plus || nextCode === minus) {
+          var nextNextCode = value.charCodeAt(pos + 2);
+
+          if (nextNextCode < 48 || nextNextCode > 57) {
+            break;
+          }
+
+          pos += 1;
+        }
+
+        pos += 1;
+      } else {
+        break;
+      }
     } else if (code === dot) {
       if (dotted) {
         break;

test/unit.js

@@ -57,6 +57,98 @@ var tests = [
   {
     fixture: "e1",
     expected: false
+  },
+  {
+    fixture: "2rem",
+    expected: { number: "2", unit: "rem" }
+  },
+  {
+    fixture: "2.000rem",
+    expected: { number: "2.000", unit: "rem" }
+  },
+  {
+    fixture: "+2rem",
+    expected: { number: "+2", unit: "rem" }
+  },
+  {
+    fixture: "-2rem",
+    expected: { number: "-2", unit: "rem" }
+  },
+  {
+    fixture: "1.1rem",
+    expected: { number: "1.1", unit: "rem" }
+  },
+  {
+    fixture: "+1.1rem",
+    expected: { number: "+1.1", unit: "rem" }
+  },
+  {
+    fixture: "-1.1rem",
+    expected: { number: "-1.1", unit: "rem" }
+  },
+  {
+    fixture: "1.1e1rem",
+    expected: { number: "1.1e1", unit: "rem" }
+  },
+  {
+    fixture: "+1.1e1rem",
+    expected: { number: "+1.1e1", unit: "rem" }
+  },
+  {
+    fixture: "-1.1e1rem",
+    expected: { number: "-1.1e1", unit: "rem" }
+  },
+  {
+    fixture: "1.1e+1rem",
+    expected: { number: "1.1e+1", unit: "rem" }
+  },
+  {
+    fixture: "1.1e-1rem",
+    expected: { number: "1.1e-1", unit: "rem" }
+  },
+  {
+    fixture: "1.1e1e1rem",
+    expected: { number: "1.1e1", unit: "e1rem" }
+  },
+  {
+    fixture: "1.1e-1e",
+    expected: { number: "1.1e-1", unit: "e" }
+  },
+  {
+    fixture: "1.1e-1rem",
+    expected: { number: "1.1e-1", unit: "rem" }
+  },
+  {
+    fixture: "1.1e--++1e",
+    expected: { number: "1.1", unit: "e--++1e" }
+  },
+  {
+    fixture: "1.1e--++1rem",
+    expected: { number: "1.1", unit: "e--++1rem" }
+  },
+  {
+    fixture: "100+px",
+    expected: { number: "100", unit: "+px" }
+  },
+  {
+    fixture: "100.0.0px",
+    expected: { number: "100.0", unit: ".0px" }
+  },
+  {
+    fixture: "100e1epx",
+    expected: { number: "100e1", unit: "epx" }
+  },
+  {
+    fixture: "100e1e1px",
+    expected: { number: "100e1", unit: "e1px" }
+  },
+  {
+    fixture: "+100.1e+1e+1px",
+    expected: { number: "+100.1e+1", unit: "e+1px" }
+  },
+  {
+    fixture: "-100.1e-1e-1px",
+    expected: { number: "-100.1e-1", unit: "e-1px" }
   }
 ];