output multiple errors instead of just dying on the first one encountered

Ficdown.Console/Program.cs

@@ -149,12 +149,10 @@
 
             var story = parser.ParseStory(storyText);
 
-            story.Orphans.ToList().ForEach(o =>
+            parser.Warnings.Select(w => w.ToString()).Distinct().ToList().ForEach(s => Console.WriteLine(s));
-            {
+            story.Orphans.ToList().ForEach(o => Console.WriteLine("Warning L{0},1: \"{1}\": Unreachable {2}", o.LineNumber, o.Name, o.Type));
-                Console.WriteLine("Warning L{0},1: \"{1}\": Unreachable {2}", o.LineNumber, o.Name, o.Type);
-            });
 
-            if(!lintMode)
+            if(!lintMode && parser.Warnings.Count() == 0)
             {
                 IRenderer rend;
                 switch (format)

Ficdown.Parser.Tests/BlockHandlerTests.cs

@@ -4,13 +4,19 @@
     using Parser;
     using Model.Parser;
     using Extensions;
+    using System.Collections.Generic;
 
     public class BlockHandlerTests
     {
+        private BlockHandler NewBlockHandler
+        {
+            get { return new BlockHandler { Warnings = new List<FicdownException>() }; }
+        }
+
         [Fact]
         public void NoStoryBlockThrowsException()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
             Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
 ## this file has no story
 just a lonely scene".ToLines())));
@@ -19,7 +25,7 @@ just a lonely scene".ToLines())));
         [Fact]
         public void StoryWithNoAnchorThrowsException()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
             Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
 # my story
 doesn't link to a scene
@@ -30,17 +36,23 @@ nothing links here".ToLines())));
         [Fact]
         public void StoriesWithFancyAnchorsThrowExceptions()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
-            Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
+            bh.ParseBlocks(bh.ExtractBlocks(@"
 # [my story](/a-scene?conditional)
 story with a conditional
 ## a scene
-this is a scene".ToLines())));
+this is a scene".ToLines()));
-            Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
+            Assert.NotEmpty(bh.Warnings);
+
+            bh = NewBlockHandler;
+            bh.ParseBlocks(bh.ExtractBlocks(@"
 # [my story](/a-scene#toggle)
 story with a toggle
 ## a scene
-this is a scene".ToLines())));
+this is a scene".ToLines()));
+            Assert.NotEmpty(bh.Warnings);
+
+            bh = NewBlockHandler;
             Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
 # [my story](/a-scene#?conditional#toggle)
 story with a conditional and a toggle
@@ -51,7 +63,7 @@ this is a scene".ToLines())));
         [Fact]
         public void StoryLinkingToNonExistentSceneThrowsException()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
             Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
 # [a story](/non-existent)
 this story links to a first scene that doesn't exist
@@ -62,7 +74,7 @@ this scene is so cold and lonely".ToLines())));
         [Fact]
         public void StoryWithALegitAnchorParses()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
             bh.ParseBlocks(bh.ExtractBlocks(@"
 # [my story](/a-scene)
 story with a simple link
@@ -73,8 +85,8 @@ this is a scene".ToLines()));
         [Fact]
         public void StoryWithDuplicateActionsThrowsException()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
-            Assert.Throws<FicdownException>(() => bh.ParseBlocks(bh.ExtractBlocks(@"
+            bh.ParseBlocks(bh.ExtractBlocks(@"
 # [a story](/a-scene)
 this story is action-happy
 ## a scene
@@ -84,13 +96,14 @@ this is an action
 ## another scene
 this is another scene
 ### an action
-oops, this is the same action!".ToLines())));
+oops, this is the same action!".ToLines()));
+            Assert.NotEmpty(bh.Warnings);
         }
 
         [Fact]
         public void StoryWithScenesAndActionsParses()
         {
-            var bh = new BlockHandler();
+            var bh = NewBlockHandler;
             var story = bh.ParseBlocks(bh.ExtractBlocks(@"
 # [my story](/a-scene)
 story with a simple link

Ficdown.Parser.Tests/UtilityTests.cs

@@ -1,14 +1,18 @@
 namespace Ficdown.Parser.Tests
 {
+    using System.Collections.Generic;
     using System.Linq;
+    using Model.Parser;
     using Parser;
     using Xunit;
 
     public class UtilityTests
     {
+        private List<FicdownException> Warnings = new List<FicdownException>();
+
         private Utilities Utilities
         {
-            get { return Utilities.GetInstance("none", 0); }
+            get { return Utilities.GetInstance(Warnings, "none", 0); }
         }
 
         [Fact]

Ficdown.Parser/FicDownParser.cs

@@ -4,6 +4,7 @@
 namespace Ficdown.Parser
 {
     using System;
+    using System.Collections.Generic;
     using System.Linq;
     using Model.Parser;
     using Parser;
@@ -11,25 +12,53 @@ namespace Ficdown.Parser
 
     public class FicdownParser
     {
+        public List<FicdownException> Warnings { get; private set; }
+
         private IBlockHandler _blockHandler;
         internal IBlockHandler BlockHandler
         {
-            get { return _blockHandler ?? (_blockHandler = new BlockHandler()); }
+            get
-            set { _blockHandler = value; }
+            {
+                return _blockHandler ??
+                    (_blockHandler = new BlockHandler { Warnings = Warnings });
+            }
+            set
+            {
+                _blockHandler = value;
+                _blockHandler.Warnings = Warnings;
+            }
         }
 
         private IGameTraverser _gameTraverser;
         internal IGameTraverser GameTraverser
         {
-            get { return _gameTraverser ?? (_gameTraverser = new GameTraverser()); }
+            get { return _gameTraverser ??
-            set { _gameTraverser = value; }
+                (_gameTraverser = new GameTraverser { Warnings = Warnings }); }
+            set
+            {
+                _gameTraverser = value;
+                _gameTraverser.Warnings = Warnings;
+            }
         }
 
         private IStateResolver _stateResolver;
         internal IStateResolver StateResolver
         {
-            get { return _stateResolver ?? (_stateResolver = new StateResolver()); }
+            get
-            set { _stateResolver = value; }
+            {
+                return _stateResolver ??
+                    (_stateResolver = new StateResolver { Warnings = Warnings });
+            }
+            set
+            {
+                _stateResolver = value;
+                _stateResolver.Warnings = Warnings;
+            }
+        }
+
+        public FicdownParser()
+        {
+            Warnings = new List<FicdownException>();
         }
 
         public ResolvedStory ParseStory(string storyText)
@@ -49,7 +78,7 @@ namespace Ficdown.Parser
                             || (scene.Conditions != null && otherScene.Conditions != null
                                 && scene.Conditions.Count == otherScene.Conditions.Count
                                 && !scene.Conditions.Except(otherScene.Conditions).Any()))
-                            throw new FicdownException(scene.Name, string.Format("Scene defined again on line {0}", otherScene.LineNumber), scene.LineNumber);
+                            Warnings.Add(new FicdownException(scene.Name, string.Format("Scene defined again on line {0}", otherScene.LineNumber), scene.LineNumber));
                     }
                 }
             }

Ficdown.Parser/Parser/BlockHandler.cs

@@ -10,6 +10,8 @@
 
     internal class BlockHandler : IBlockHandler
     {
+        public List<FicdownException> Warnings { get; set; }
+
         public IEnumerable<Block> ExtractBlocks(IEnumerable<string> lines)
         {
             var blocks = new List<Block>();
@@ -51,19 +53,16 @@
 
             var storyBlock = storyBlocks.Single();
 
-            Anchor storyAnchor;
+            var storyAnchor = Utilities.GetInstance(Warnings, storyBlock.Name, storyBlock.LineNumber).ParseAnchor(storyBlock.Name, storyBlock.LineNumber, 1);
-            try
+
+            if(storyAnchor == null || storyAnchor.Href == null)
             {
-                storyAnchor = Utilities.GetInstance(storyBlock.Name, storyBlock.LineNumber).ParseAnchor(storyBlock.Name, storyBlock.LineNumber, 1);
+                throw new FicdownException(storyBlock.Name, "Story name must be an anchor pointing to the first scene", storyBlock.LineNumber);
-            }
-            catch(FicdownException ex)
-            {
-                throw new FicdownException(ex.BlockName, "Story name must be an anchor pointing to the first scene", ex.LineNumber);
             }
 
             if (storyAnchor.Href.Target == null || storyAnchor.Href.Conditions != null ||
                 storyAnchor.Href.Toggles != null)
-                throw new FicdownException(storyBlock.Name, "Story href should only have a target", storyBlock.LineNumber);
+                Warnings.Add(new FicdownException(storyBlock.Name, "Story href should only have a target", storyBlock.LineNumber));
 
             var story = new Story
             {
@@ -91,7 +90,7 @@
                 var a = blocks.First(b => b.Type == BlockType.Action && blocks.Any(d => b != d && BlockToAction(b, 0).Toggle == BlockToAction(d, 0).Toggle));
                 var actionA = BlockToAction(a, a.LineNumber);
                 var dupe = blocks.First(b => b.Type == BlockType.Action && b != a && BlockToAction(b, 0).Toggle == actionA.Toggle);
-                throw new FicdownException(actionA.Toggle, string.Format("Action is defined again on line {0}", dupe.LineNumber), actionA.LineNumber);
+                Warnings.Add(new FicdownException(actionA.Toggle, string.Format("Action is defined again on line {0}", dupe.LineNumber), actionA.LineNumber));
             }
 
             if (!story.Scenes.ContainsKey(storyAnchor.Href.Target))
@@ -112,19 +111,19 @@
                 Description = string.Join("\n", block.Lines.Select(l => l.Text)).Trim()
             };
 
-            if(RegexLib.Anchors.IsMatch(block.Name))
+            Anchor sceneName;
+            if(RegexLib.Anchors.IsMatch(block.Name) && (sceneName = Utilities.GetInstance(Warnings, block.Name, block.LineNumber).ParseAnchor(block.Name, block.LineNumber, 1)).Href != null)
             {
-                var sceneName = Utilities.GetInstance(block.Name, block.LineNumber).ParseAnchor(block.Name, block.LineNumber, 1);
                 scene.Name = sceneName.Title != null ? sceneName.Title.Trim() : sceneName.Text.Trim();
-                scene.Key = Utilities.GetInstance(block.Name, block.LineNumber).NormalizeString(sceneName.Text);
+                scene.Key = Utilities.GetInstance(Warnings, block.Name, block.LineNumber).NormalizeString(sceneName.Text);
                 if(sceneName.Href.Target != null || sceneName.Href.Toggles != null)
-                    throw new FicdownException(block.Name, "Scene href should only have conditions", block.LineNumber);
+                    Warnings.Add(new FicdownException(block.Name, "Scene href should only have conditions", block.LineNumber));
                 scene.Conditions = sceneName.Href.Conditions;
             }
             else
             {
                 scene.Name = block.Name.Trim();
-                scene.Key = Utilities.GetInstance(block.Name, block.LineNumber).NormalizeString(block.Name);
+                scene.Key = Utilities.GetInstance(Warnings, block.Name, block.LineNumber).NormalizeString(block.Name);
             }
 
             return scene;
@@ -135,7 +134,7 @@
             return new Action
             {
                 Id = id,
-                Toggle = Utilities.GetInstance(block.Name, block.LineNumber).NormalizeString(block.Name),
+                Toggle = Utilities.GetInstance(Warnings, block.Name, block.LineNumber).NormalizeString(block.Name),
                 RawDescription = string.Join("\n", block.Lines.Select(l => l.Text)),
                 Description = string.Join("\n", block.Lines.Select(l => l.Text)).Trim(),
                 LineNumber = block.LineNumber

Ficdown.Parser/Parser/IBlockHandler.cs

@@ -6,6 +6,7 @@
 
     internal interface IBlockHandler
     {
+        List<FicdownException> Warnings { set; }
         IEnumerable<Block> ExtractBlocks(IEnumerable<string> lines);
         Story ParseBlocks(IEnumerable<Block> blocks);
     }

Ficdown.Parser/Parser/IStateResolver.cs

@@ -7,6 +7,7 @@
 
     internal interface IStateResolver
     {
+        List<FicdownException> Warnings { set; }
         ResolvedStory Resolve(IEnumerable<PageState> pages, Story story);
     }
 }

Ficdown.Parser/Parser/StateResolver.cs

@@ -15,6 +15,8 @@
         private readonly HashSet<string> _usedNames;
         private Story _story;
 
+        public List<FicdownException> Warnings { private get; set; }
+
         public StateResolver()
         {
             _pageNames = new Dictionary<string, string>();
@@ -43,13 +45,16 @@
         private string ResolveAnchor(string blockName, int lineNumber, Anchor anchor, IDictionary<string, bool> playerState, string targetHash)
         {
             var text = anchor.Text;
-            if (anchor.Href.Conditions != null)
+            if (anchor.Href != null && anchor.Href.Conditions != null)
+            {
+                var satisfied = Utilities.GetInstance(Warnings, blockName, lineNumber).ConditionsMet(playerState, anchor.Href.Conditions);
+                var alts = Utilities.GetInstance(Warnings, blockName, lineNumber).ParseConditionalText(anchor);
+                if(alts != null)
                 {
-                var satisfied = Utilities.GetInstance(blockName, lineNumber).ConditionsMet(playerState, anchor.Href.Conditions);
-                var alts = Utilities.GetInstance(blockName, lineNumber).ParseConditionalText(anchor);
                     var replace = alts[satisfied];
                     text = RegexLib.EscapeChar.Replace(replace, string.Empty);
                 }
+            }
             return !string.IsNullOrEmpty(text) && !string.IsNullOrEmpty(targetHash)
                 ? string.Format("[{0}](/{1})", text, GetPageNameForHash(targetHash))
                 : text;
@@ -67,7 +72,7 @@
                 if (page.State.ActionsToShow[i])
                 {
                     var actionTuple = _story.Actions.Single(a => a.Value.Id == i + 1);
-                    var actionAnchors = Utilities.GetInstance(page.Scene.Name, page.Scene.LineNumber).ParseAnchors(actionTuple.Value.RawDescription);
+                    var actionAnchors = Utilities.GetInstance(Warnings, page.Scene.Name, page.Scene.LineNumber).ParseAnchors(actionTuple.Value.RawDescription);
                     var anchorDict = GetStateDictionary(page);
                     if (
                         actionAnchors.Any(
@@ -86,7 +91,7 @@
                 }
             }
 
-            var anchors = Utilities.GetInstance(page.Scene.Name, page.Scene.LineNumber).ParseAnchors(page.Scene.RawDescription);
+            var anchors = Utilities.GetInstance(Warnings, page.Scene.Name, page.Scene.LineNumber).ParseAnchors(page.Scene.RawDescription);
             var stateDict = GetStateDictionary(page);
             var text =
                 RegexLib.EmptyListItem.Replace(

Ficdown.Parser/Parser/Utilities.cs

@@ -1,6 +1,5 @@
 namespace Ficdown.Parser.Parser
 {
-    using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text.RegularExpressions;
@@ -8,19 +7,23 @@
 
     internal class Utilities
     {
-        public static Utilities GetInstance(string blockName, int lineNumber)
+        private List<FicdownException> _warnings { get; set; }
+
+        public static Utilities GetInstance(List<FicdownException> warnings, string blockName, int lineNumber)
         {
             return new Utilities
             {
+                _warnings = warnings,
                 _blockName = blockName,
                 _lineNumber = lineNumber
             };
         }
 
-        public static Utilities GetInstance(string blockName)
+        public static Utilities GetInstance(List<FicdownException> warnings, string blockName)
         {
             return new Utilities
             {
+                _warnings = warnings,
                 _blockName = blockName
             };
         }
@@ -56,13 +59,18 @@
                             : null
                 };
             }
-            throw new FicdownException(_blockName, string.Format("Invalid href: {0}", href), lineNumber, colNumber);
+            _warnings.Add(new FicdownException(_blockName, string.Format("Invalid href: {0}", href), lineNumber, colNumber));
+            return null;
         }
 
         public Anchor ParseAnchor(string anchorText, int lineNumber, int colNumber)
         {
             var match = RegexLib.Anchors.Match(anchorText);
-            if (!match.Success) throw new FicdownException(_blockName, string.Format("Invalid anchor: {0}", anchorText), lineNumber, colNumber);
+            if (!match.Success)
+            {
+                _warnings.Add(new FicdownException(_blockName, string.Format("Invalid anchor: {0}", anchorText), lineNumber, colNumber));
+                return null;
+            }
             return MatchToAnchor(match, lineNumber, colNumber);
         }
 
@@ -121,7 +129,10 @@
         {
             var match = RegexLib.ConditionalText.Match(anchor.Text);
             if (!match.Success)
-                throw new FicdownException(_blockName, string.Format(@"Invalid conditional text: {0}", anchor.Text), anchor.LineNumber, anchor.ColNumber);
+            {
+                _warnings.Add(new FicdownException(_blockName, string.Format(@"Invalid conditional text: {0}", anchor.Text), anchor.LineNumber, anchor.ColNumber));
+                return null;
+            }
 
             return new Dictionary<bool, string>
             {

Ficdown.Parser/Player/GameTraverser.cs

@@ -3,6 +3,7 @@
     using System;
     using System.Collections.Generic;
     using System.Linq;
+    using Model.Parser;
     using Model.Player;
     using Model.Story;
     using Parser;
@@ -17,6 +18,8 @@
         private IDictionary<int, Action> _actionMatrix;
         private bool _wasRun = false;
 
+        public List<FicdownException> Warnings { private get; set; }
+
         private Story _story;
         public Story Story
         {
@@ -25,7 +28,7 @@
             {
                 _story = value;
                 _actionMatrix = _story.Actions.ToDictionary(a => a.Value.Id, a => a.Value);
-                _manager = new StateManager(_story);
+                _manager = new StateManager(_story, Warnings);
                 _processingQueue = new Queue<StateQueueItem>();
                 _processed = new Dictionary<string, PageState>();
                 _compressed = new Dictionary<string, PageState>();
@@ -125,15 +128,15 @@
 
             var states = new HashSet<string>();
 
-            var anchors = Utilities.GetInstance(currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ParseAnchors(currentState.Page.Scene.RawDescription).ToList();
+            var anchors = Utilities.GetInstance(Warnings, currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ParseAnchors(currentState.Page.Scene.RawDescription).ToList();
             foreach (var action in GetActionsForPage(currentState.Page))
             {
                 action.Visited = true;
-                anchors.AddRange(Utilities.GetInstance(action.Toggle, action.LineNumber).ParseAnchors(action.RawDescription));
+                anchors.AddRange(Utilities.GetInstance(Warnings, action.Toggle, action.LineNumber).ParseAnchors(action.RawDescription));
             }
             var conditionals =
                 anchors.SelectMany(
-                    a => a.Href.Conditions != null ? a.Href.Conditions.Select(c => c.Key) : new string[] {})
+                    a => a.Href != null && a.Href.Conditions != null ? a.Href.Conditions.Select(c => c.Key) : new string[] {})
                     .Distinct()
                     .ToArray();
             var hasFirstSeen = RegexLib.BlockQuotes.IsMatch(currentState.Page.Scene.Description);
@@ -147,30 +150,32 @@
                         var anchor = anchors.FirstOrDefault(a =>
                             a.Href.Conditions != null
                             && a.Href.Conditions.Keys.Contains(conditional.Key));
-                        _manager.ToggleStateOn(affected, conditional.Key, currentState.Page.Scene.Name, anchor);
+                        _manager.ToggleStateOn(affected, conditional.Key, currentState.Page.Scene.Name, anchor != null ? anchor.LineNumber : currentState.Page.Scene.LineNumber, anchor != null ? anchor.ColNumber : 1);
                     }
                 foreach (var conditional in conditionals)
                 {
                     var anchor = anchors.FirstOrDefault(a =>
                         a.Href.Conditions != null
                         && a.Href.Conditions.Keys.Contains(conditional));
-                    _manager.ToggleStateOn(affected, conditional, currentState.Page.Scene.Name, anchor);
+                    _manager.ToggleStateOn(affected, conditional, currentState.Page.Scene.Name, anchor != null ? anchor.LineNumber : currentState.Page.Scene.LineNumber, anchor != null ? anchor.ColNumber : 1);
                 }
 
                 // signal to previous scenes if this scene has first-seen text
                 if (hasFirstSeen) _manager.ToggleSeenSceneOn(affected, currentState.Page.Scene.Id);
             }
 
-            foreach (var anchor in anchors.Where(a => a.Href.Target != null || a.Href.Toggles != null))
+            foreach (var anchor in anchors.Where(a => a.Href != null && (a.Href.Target != null || a.Href.Toggles != null)))
             {
                 // don't follow links that would be hidden
                 if (anchor.Href.Conditions != null &&
                     string.IsNullOrEmpty(
-                        Utilities.GetInstance(currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ParseConditionalText(anchor)[
+                        Utilities.GetInstance(Warnings, currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ParseConditionalText(anchor)[
-                            Utilities.GetInstance(currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ConditionsMet(StateResolver.GetStateDictionary(currentState.Page),
+                            Utilities.GetInstance(Warnings, currentState.Page.Scene.Name, currentState.Page.Scene.LineNumber).ConditionsMet(StateResolver.GetStateDictionary(currentState.Page),
                                 anchor.Href.Conditions)])) continue;
 
                 var newState = _manager.ResolveNewState(anchor, currentState.Page);
+                if(newState.Scene != null)
+                {
                     if (!currentState.Page.Links.ContainsKey(anchor.Original))
                         currentState.Page.Links.Add(anchor.Original, newState.UniqueHash);
 
@@ -184,4 +189,5 @@
                 }
             }
         }
+    }
 }

Ficdown.Parser/Player/IGameTraverser.cs

@@ -1,11 +1,13 @@
 namespace Ficdown.Parser.Player
 {
     using System.Collections.Generic;
+    using Model.Parser;
     using Model.Player;
     using Model.Story;
 
     internal interface IGameTraverser
     {
+        List<FicdownException> Warnings { set; }
         Story Story { get; set; }
         IEnumerable<PageState> Enumerate();
         IEnumerable<Scene> OrphanedScenes { get; }

Ficdown.Parser/Player/StateManager.cs

@@ -16,8 +16,11 @@
         private readonly int _sceneCount;
         private readonly int _actionCount;
 
-        public StateManager(Story story)
+        private List<FicdownException> _warnings { get; set; }
+
+        public StateManager(Story story, List<FicdownException> warnings)
         {
+            _warnings = warnings;
             _story = story;
             var allScenes = _story.Scenes.SelectMany(s => s.Value);
             _sceneCount = allScenes.Max(s => s.Id);
@@ -28,10 +31,10 @@
                 var toggle in
                     allScenes.SelectMany(
                         sc =>
-                            Utilities.GetInstance(sc.Name, sc.LineNumber).ParseAnchors(sc.RawDescription)
+                            Utilities.GetInstance(_warnings, sc.Name, sc.LineNumber).ParseAnchors(sc.RawDescription)
                                 .SelectMany(
                                     a =>
-                                        a.Href.Toggles != null
+                                        a.Href != null && a.Href.Toggles != null
                                             ? a.Href.Toggles.Where(t => !_stateMatrix.ContainsKey(t))
                                             : new string[] {})))
             {
@@ -47,7 +50,7 @@
                 if(scene.Count()  == 0)
                     throw new FicdownException(_story.Name, string.Format("Story links to undefined scene: {0}", _story.FirstScene));
                 if(scene.Count() > 1)
-                    throw new FicdownException(_story.Name, string.Format("Story links to scene that is defined more than once: {0}", _story.FirstScene));
+                    _warnings.Add(new FicdownException(_story.Name, string.Format("Story links to scene that is defined more than once: {0}", _story.FirstScene)));
 
                 return new PageState
                 {
@@ -67,7 +70,7 @@
                         ActionsToShow = new BitArray(_actionCount),
                         ActionFirstToggles = null
                     },
-                    Scene = scene.Single(),
+                    Scene = scene.First(),
                     StateMatrix = _stateMatrix
                 };
             }
@@ -89,7 +92,7 @@
                         if(actionFirstToggles == null) actionFirstToggles = new List<bool>();
                         newState.State.ActionsToShow[_story.Actions[toggle].Id - 1] = true;
                         if (
-                            Utilities.GetInstance(_story.Actions[toggle].Toggle, _story.Actions[toggle].LineNumber).ParseAnchors(_story.Actions[toggle].RawDescription)
+                            Utilities.GetInstance(_warnings, _story.Actions[toggle].Toggle, _story.Actions[toggle].LineNumber).ParseAnchors(_story.Actions[toggle].RawDescription)
                                 .Any(a => a.Href.Conditions != null && a.Href.Conditions.ContainsKey(toggle)))
                             actionFirstToggles.Add(!current.State.PlayerState[_stateMatrix[toggle]]);
                     }
@@ -103,11 +106,12 @@
             return newState;
         }
 
-        public void ToggleStateOn(State state, string toggle, string blockName, Anchor anchor)
+        public void ToggleStateOn(State state, string toggle, string blockName, int lineNumber, int colNumber)
         {
-            if(!_stateMatrix.ContainsKey(toggle))
+            if(_stateMatrix.ContainsKey(toggle))
-                throw new FicdownException(blockName, string.Format("Conditional for undefined state: {0}", toggle), anchor != null ? anchor.LineNumber : 1, anchor != null ? anchor.ColNumber : 1);
                 state.PlayerState[_stateMatrix[toggle]] = true;
+            else
+                _warnings.Add(new FicdownException(blockName, string.Format("Conditional for undefined state: {0}", toggle), lineNumber, colNumber));
         }
 
         public void ToggleSeenSceneOn(State state, int sceneId)
@@ -148,9 +152,8 @@
 
         private Scene GetScene(string blockName, Anchor anchor, string target, BitArray playerState)
         {
-            if (!_story.Scenes.ContainsKey(target))
+            if (_story.Scenes.ContainsKey(target))
-                throw new FicdownException(blockName, string.Format("Link to undefined scene: {0}", target), anchor.LineNumber, anchor.ColNumber);
+            {
-
                 Scene newScene = null;
                 foreach (var scene in _story.Scenes[target])
                 {
@@ -162,18 +165,22 @@
                     }
                 }
                 if (newScene == null)
-                throw new FicdownException(blockName, string.Format("Link to scene that is undefined for conditionals: {0}", target), anchor.LineNumber, anchor.ColNumber);
+                    _warnings.Add(new FicdownException(blockName, string.Format("Link to scene that is undefined for conditionals: {0}", target), anchor.LineNumber, anchor.ColNumber));
                 return newScene;
             }
+            _warnings.Add(new FicdownException(blockName, string.Format("Link to undefined scene: {0}", target), anchor.LineNumber, anchor.ColNumber));
+            return null;
+        }
 
         private bool ConditionsMatch(Scene scene, BitArray playerState)
         {
             if (scene.Conditions == null) return true;
             scene.Conditions.ToList().ForEach(c =>
             {
-                if(!_stateMatrix.ContainsKey(c.Key)) throw new FicdownException(scene.Name, string.Format("Conditional for undefined state: {0}", c.Key), scene.LineNumber);
+                if(!_stateMatrix.ContainsKey(c.Key))
+                    _warnings.Add(new FicdownException(scene.Name, string.Format("Conditional for undefined state: {0}", c.Key), scene.LineNumber));
             });
-            return scene.Conditions.All(c => playerState[_stateMatrix[c.Key]] == c.Value);
+            return scene.Conditions.Where(c => _stateMatrix.ContainsKey(c.Key)).All(c => playerState[_stateMatrix[c.Key]] == c.Value);
         }
 
         private PageState ClonePage(PageState page)

Ficdown.Parser/Render/HtmlRenderer.cs

@@ -13,6 +13,8 @@
 
         protected readonly Markdown Markdown;
 
+        public List<FicdownException> Warnings { private get; set; }
+
         public string IndexTemplate { get; set; }
         public string SceneTemplate { get; set; }
         public string StylesTemplate { get; set; }
@@ -55,7 +57,7 @@
                 File.WriteAllText(Path.Combine(outPath, "styles.css"), StylesTemplate ?? Template.Styles);
 
                 var content = page.Content;
-                foreach (var anchor in Utilities.GetInstance(page.Name).ParseAnchors(page.Content))
+                foreach (var anchor in Utilities.GetInstance(Warnings, page.Name).ParseAnchors(page.Content))
                 {
                     var newAnchor = string.Format("[{0}]({1}.html)", anchor.Text, anchor.Href.Target);
                     content = content.Replace(anchor.Original, newAnchor);

Ficdown.Parser/Render/IRenderer.cs

@@ -1,10 +1,11 @@
 namespace Ficdown.Parser.Render
 {
-    using System.Security.Cryptography.X509Certificates;
+    using System.Collections.Generic;
     using Model.Parser;
 
     public interface IRenderer
     {
+        List<FicdownException> Warnings { set; }
         string IndexTemplate { get; set; }
         string SceneTemplate { get; set; }
         string StylesTemplate { get; set; }