Add support for property-only entries

src/IniParser.Tests/Unit/Parser/ParserTests.cs

@@ -90,6 +90,34 @@ public void parse_ini_string_with_custom_configuration()
             Assert.That(section1.Properties["key2"], Is.EqualTo("value5"));
         }
 
+        [Test, Description("Tests for ability to parse properties with no values")]
+        public void test_parsing_properties_without_value()
+        {
+            var iniString = @"
+[section1]
+value1
+value2";
+            var parser = new IniDataParser();
+            parser.Configuration.AllowPropertiesWithoutValue = true;
+            var parsedData = parser.Parse(iniString);
+
+            Assert.That(parsedData["section1"].Contains("value1"), Is.True);
+            Assert.That(parsedData["section1"]["value1"], Is.Null);
+        }
+
+        [Test, Description("Tests for ability to parse properties with empty values")]
+        public void test_parsing_properties_with_empty_value()
+        {
+            var iniString = @"
+[section1]
+value1=";
+            var parser = new IniDataParser();
+            var parsedData = parser.Parse(iniString);
+
+            Assert.That(parsedData["section1"].Contains("value1"), Is.True);
+            Assert.That(parsedData["section1"]["value1"], Is.Empty);
+        }
+
         [Test, Description("Test for Issue 3: http://code.google.com/p/ini-parser/issues/detail?id=3")]
         public void allow_keys_with_dots()
         {

src/IniParser/Configuration/IniParserConfiguration.cs

@@ -37,6 +37,7 @@ public IniParserConfiguration()
             AllowDuplicateSections = ori.AllowDuplicateSections;
             ThrowExceptionsOnError = ori.ThrowExceptionsOnError;
             SkipInvalidLines = ori.SkipInvalidLines;
+            AllowPropertiesWithoutValue = ori.AllowPropertiesWithoutValue;
             TrimSections = ori.TrimSections;
             TrimProperties = ori.TrimProperties;
         }
@@ -142,6 +143,15 @@ public enum EDuplicatePropertiesBehaviour
         /// </remarks>
         public bool SkipInvalidLines { get; set; } = false;
 
+        /// <summary>
+        /// If true, it will consider lines that does not contains an assignment 
+        /// character as properties with a null value
+        /// </summary>
+        /// <remarks>
+        ///     Defaults to <c>false</c>.
+        /// </remarks>
+        public bool AllowPropertiesWithoutValue { get; set; }
+
         /// <summary>
         ///     If set to true, it will trim the whitespace out of the property when parsing.
         ///     If set to false, it will consider all the whitespace in the line as part of the

src/IniParser/IniDataParser.cs

@@ -343,20 +343,33 @@ protected virtual bool ProcessProperty(StringBuffer currentLine, IniData iniData
 
             var propertyAssigmentIdx = currentLine.FindSubstring(Scheme.PropertyAssigmentString);
 
-            if (propertyAssigmentIdx.IsEmpty) return false;
-
-            var keyRange = Range.WithIndexes(0, propertyAssigmentIdx.start - 1);
-            var valueStartIdx = propertyAssigmentIdx.end + 1;
-            var valueSize = currentLine.Count - propertyAssigmentIdx.end - 1;
-            var valueRange = Range.FromIndexWithSize(valueStartIdx, valueSize);
+            StringBuffer key;
+            StringBuffer value;
+            if (propertyAssigmentIdx.IsEmpty)
+            {
+                if (Configuration.AllowPropertiesWithoutValue)
+                {
+                    key = currentLine;
+                    value = null;
+                }
+                else
+                    return false;
+            }
+            else
+            {
+                var keyRange = Range.WithIndexes(0, propertyAssigmentIdx.start - 1);
+                var valueStartIdx = propertyAssigmentIdx.end + 1;
+                var valueSize = currentLine.Count - propertyAssigmentIdx.end - 1;
+                var valueRange = Range.FromIndexWithSize(valueStartIdx, valueSize);
 
-            var key = currentLine.Substring(keyRange);
-            var value = currentLine.Substring(valueRange);
+                key = currentLine.Substring(keyRange);
+                value = currentLine.Substring(valueRange);
+            }
 
             if (Configuration.TrimProperties)
             {
                 key.Trim();
-                value.Trim();
+                value?.Trim();
             }
 
             if (key.IsEmpty)
@@ -389,7 +402,7 @@ protected virtual bool ProcessProperty(StringBuffer currentLine, IniData iniData
                 }
 
                 AddKeyToKeyValueCollection(key.ToString(), 
-                                           value.ToString(),
+                                           value?.ToString(),
                                            iniData.Global, 
                                            "global");
             }
@@ -398,7 +411,7 @@ protected virtual bool ProcessProperty(StringBuffer currentLine, IniData iniData
                 var currentSection = iniData.Sections.FindByName(_currentSectionNameTemp);
 
                 AddKeyToKeyValueCollection(key.ToString(),
-                                           value.ToString(), 
+                                           value?.ToString(), 
                                            currentSection.Properties,
                                            _currentSectionNameTemp);
             }