support negative numbers

Author: Andreas Pizsa

dist/parse-decimal-number.js

@@ -32,15 +32,15 @@
     patternIndex = "" + thousands + decimal;
     pattern = patterns[patternIndex];
     if (!pattern) {
-      pattern = patterns[patternIndex] = new RegExp('^\\s*((?:\\d{1,3}(?:\\' + thousands + '\\d{3})+)|\\d*)(?:\\' + decimal + '(\\d*))?\\s*$');
+      pattern = patterns[patternIndex] = new RegExp('^\\s*(-?(?:(?:\\d{1,3}(?:\\' + thousands + '\\d{3})+)|\\d*))(?:\\' + decimal + '(\\d*))?\\s*$');
     }
     result = value.match(pattern);
     if (!result || result.length !== 3) {
       return NaN;
     }
     integerPart = result[1].replace(new RegExp("\\" + thousands, 'g'), '');
     fractionPart = result[2];
-    number = parseFloat("" + integerPart + "." + fractionPart);
+    number = parseFloat(integerPart + "." + fractionPart);
     return number;
   };
 

dist/parse-decimal-number.min.js

@@ -18,7 +18,7 @@ module.exports = (value,inOptions)->
   patternIndex = "#{thousands}#{decimal}"
   pattern = patterns[patternIndex]
   if not pattern
-    pattern = patterns[patternIndex] = new RegExp ('^\\s*((?:\\d{1,3}(?:\\' + thousands + '\\d{3})+)|\\d*)(?:\\' + decimal + '(\\d*))?\\s*$')
+    pattern = patterns[patternIndex] = new RegExp ('^\\s*(-?(?:(?:\\d{1,3}(?:\\' + thousands + '\\d{3})+)|\\d*))(?:\\' + decimal + '(\\d*))?\\s*$')
 
   result = value.match pattern
   return NaN if not result or result.length != 3

src/parse-decimal-number.coffee

@@ -57,6 +57,9 @@ describe 'parse-decimal-number',->
   it 'correctly parses normal floats with default options',->
     assert.strictEqual parseDecimalNumber('12345679.09'),12345679.09
 
+  it 'correctly parses negative floats with default options',->
+    assert.strictEqual parseDecimalNumber('-12345679.09'),-12345679.09
+
   it 'correctly parses all decimal formats',->
     testAllNumbers 999999999,true