Produce nicer error messages in C#

5 files changed, 41 insertions, 1 deletions

diff --git a/dotnet/Mammoth.Tests/DocumentConverterTests.cs b/dotnet/Mammoth.Tests/DocumentConverterTests.cs
index 89ade1c..92a3adf 100644
--- a/dotnet/Mammoth.Tests/DocumentConverterTests.cs
+++ b/dotnet/Mammoth.Tests/DocumentConverterTests.cs
@@ -151,13 +151,24 @@ namespace Mammoth.Tests {
         }
 
         [Fact]
-        public void RulesFromPreviouslyAddedStyleMapsStillTakeEffectIfNotOverriden() {
+        public void RulesFromPreviouslyAddedStyleMapsStillTakeEffectIfNotOverridden() {
             AssertSuccessfulConversion(
                 ConvertToHtml("underline.docx", mammoth => mammoth.AddStyleMap("u => em").AddStyleMap("strike => del")),
                 "<p><strong>The <em>Sunset</em> Tree</strong></p>");
         }
 
         [Fact]
+        public void ErrorIsRaisedIfStyleMapCannotBeParsed() {
+	    var exception = Assert.ThrowsAny<Exception>(() =>
+		new DocumentConverter().AddStyleMap("p =>\np[style-name=] =>"));
+	    Assert.Equal(
+		"error reading style map at line 2, character 14: expected token of type _STRING but was of type _CLOSE_SQUARE_BRACKET\n\n" +
+                "p[style-name=] =>\n" +
+                "             ^",
+		exception.Message);
+        }
+
+        [Fact]
         public void CanDisableDefaultStyleMap() {
             var result = ConvertToHtml("simple-list.docx", mammoth => mammoth.DisableDefaultStyleMap());
             Assert.Equal(new[]{"Unrecognised paragraph style: List Paragraph (Style ID: ListParagraph)"}, result.Warnings);
diff --git a/dotnet/Mammoth/Couscous/HorribleHacks.cs b/dotnet/Mammoth/Couscous/HorribleHacks.cs
index 9f1ac30..c97dc0a 100644
--- a/dotnet/Mammoth/Couscous/HorribleHacks.cs
+++ b/dotnet/Mammoth/Couscous/HorribleHacks.cs
@@ -26,5 +26,9 @@ namespace Mammoth.Couscous {
         internal static bool equals(this TokenType first, TokenType second) {
             return first == second;
         }
+        
+        internal static string getMessage(this System.Exception exception) {
+            return exception.Message;
+        }
     }
 }
diff --git a/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/LineParseException.cs b/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/LineParseException.cs
new file mode 100644
index 0000000..6ca9381
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/LineParseException.cs
@@ -0,0 +1,15 @@
+using Mammoth.Couscous.java.lang;
+
+namespace Mammoth.Couscous.org.zwobble.mammoth.@internal.styles.parsing {
+    internal class LineParseException : RuntimeException {
+        private readonly Token _token;
+        
+        internal LineParseException(Token token, string message) : base(message) {
+            _token = token;
+        }
+        
+        internal Token getToken() {
+            return _token;
+        }
+    }
+}
diff --git a/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/ParseException.cs b/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/ParseException.cs
new file mode 100644
index 0000000..73f349c
--- /dev/null
+++ b/dotnet/Mammoth/Couscous/mammoth/internal/styles/parsing/ParseException.cs
@@ -0,0 +1,8 @@
+using Mammoth.Couscous.java.lang;
+
+namespace Mammoth.Couscous.org.zwobble.mammoth.@internal.styles.parsing {
+    internal class ParseException : RuntimeException {
+        internal ParseException(string message) : base(message) {
+        }
+    }
+}
diff --git a/dotnet/Mammoth/Mammoth.csproj b/dotnet/Mammoth/Mammoth.csproj
index 4e945d0..6e2c473 100644
--- a/dotnet/Mammoth/Mammoth.csproj
+++ b/dotnet/Mammoth/Mammoth.csproj
@@ -81,6 +81,8 @@
     <Compile Include="Couscous\java\util\Set.cs" />
     <Compile Include="Couscous\mammoth\internal\docx\InMemoryDocxFile.cs" />
     <Compile Include="Couscous\mammoth\internal\docx\ZippedDocxFile.cs" />
+    <Compile Include="Couscous\mammoth\internal\styles\parsing\LineParseException.cs" />
+    <Compile Include="Couscous\mammoth\internal\styles\parsing\ParseException.cs" />
     <Compile Include="Couscous\mammoth\internal\util\Base64Encoding.cs" />
     <Compile Include="Couscous\mammoth\internal\util\Casts.cs" />
     <Compile Include="Couscous\mammoth\internal\util\Lists.cs" />