From dd779c375fb14fecf70d2d230024cad5187a54f6 Mon Sep 17 00:00:00 2001
From: Igor Rafael <igor.rafael@gmail.com>
Date: Sun, 24 Sep 2017 12:56:26 -0300
Subject: [PATCH] feat(uiScientificNotationMask): allow negative exponents

---
 .../scientific-notation/scientific-notation.js   | 12 ++++++++++--
 .../scientific-notation.spec.js                  | 16 ++++++++++++++++
 .../scientific-notation.test.js                  | 12 ++++++++++++
 3 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/src/global/scientific-notation/scientific-notation.js b/src/global/scientific-notation/scientific-notation.js
index 9953b0da..3817d5b6 100644
--- a/src/global/scientific-notation/scientific-notation.js
+++ b/src/global/scientific-notation/scientific-notation.js
@@ -95,8 +95,16 @@ function ScientificNotationMaskDirective($locale, $parse) {
 					return value;
 				}
 
-				var viewValue = formatter(value),
-					modelValue = parseFloat(viewValue.replace(decimalDelimiter, '.'));
+				var isExponentNegative = /e-/.test(value);
+				var cleanValue = value.replace(/-/g,'');
+				var viewValue = formatter(cleanValue);
+
+				var needsToInvertSign = (value.slice(-1) === '-');
+				if (needsToInvertSign ^ isExponentNegative) {
+					viewValue = viewValue.replace(/(e[-]?)/, 'e-');
+				}
+
+				var modelValue = parseFloat(viewValue.replace(decimalDelimiter, '.'));
 
 				if (ctrl.$viewValue !== viewValue) {
 					ctrl.$setViewValue(viewValue);
diff --git a/src/global/scientific-notation/scientific-notation.spec.js b/src/global/scientific-notation/scientific-notation.spec.js
index cebff16f..495ccd46 100644
--- a/src/global/scientific-notation/scientific-notation.spec.js
+++ b/src/global/scientific-notation/scientific-notation.spec.js
@@ -165,4 +165,20 @@ describe('uiScientificNotationMask', function() {
 		expect(input.getAttribute('value')).toEqual('0');
 		expect(value.getText()).toEqual('0');
 	});
+
+	it('should format numbers with negative exponent', function() {
+		var input = element(by.model('scientificNotationMask')),
+			value = element(by.exactBinding('scientificNotationMask'));
+
+		input.clear();
+		input.sendKeys('1234');
+		expect(input.getAttribute('value')).toEqual('1,23e4');
+		expect(value.getText()).toEqual('12300');
+		input.sendKeys('-');
+		expect(input.getAttribute('value')).toEqual('1,23e-4');
+		expect(value.getText()).toEqual('0.000123');
+		input.sendKeys('-');
+		expect(input.getAttribute('value')).toEqual('1,23e4');
+		expect(value.getText()).toEqual('12300');
+	});
 });
diff --git a/src/global/scientific-notation/scientific-notation.test.js b/src/global/scientific-notation/scientific-notation.test.js
index 021352f0..73ca73b4 100644
--- a/src/global/scientific-notation/scientific-notation.test.js
+++ b/src/global/scientific-notation/scientific-notation.test.js
@@ -49,6 +49,15 @@ describe('ui-scientific-notation-mask', function() {
 		expect(model.$viewValue).toBe('1.235e4');
 	});
 
+	it('should format initial model values with negative exponent', function() {
+		var input = TestUtil.compile('<input ng-model="model" ui-scientific-notation-mask>', {
+			model: 1.3456e-3
+		});
+
+		var model = input.controller('ngModel');
+		expect(model.$viewValue).toBe('1.35e-3');
+	});
+
 	it('should format input', function() {
 		var input = TestUtil.compile('<input ng-model="model" ui-scientific-notation-mask>');
 		var model = input.controller('ngModel');
@@ -59,6 +68,9 @@ describe('ui-scientific-notation-mask', function() {
 		input.val('1.2345').triggerHandler('input');
 		expect(model.$viewValue).toBe('1.23e45');
 		expect(model.$modelValue).toBe(1.23e45);
+		input.val('1.2345e-9').triggerHandler('input');
+		expect(model.$viewValue).toBe('1.23e-9');
+		expect(model.$modelValue).toBe(1.23e-9);
 	});
 
 	it('should handle corner cases', angular.mock.inject(function($rootScope) {