Better error handling

Models/ThemeConfig/Conversion/Conversion.ts

@@ -202,6 +202,7 @@ export class Fuse<T> extends DesugaringStep<T> {
         const information = []
         for (let i = 0; i < this.steps.length; i++) {
             const step = this.steps[i];
+            try{
                 let r = step.convert(json, "While running step " + step.name + ": " + context)
                 errors.push(...r.errors ?? [])
                 warnings.push(...r.warnings ?? [])
@@ -210,6 +211,10 @@ export class Fuse<T> extends DesugaringStep<T> {
                 if (errors.length > 0) {
                     break;
                 }
+            }catch(e){
+                console.error("Step "+step.name+" failed due to "+e);
+                throw e
+            }
         }
         return {
             result: json,

Models/ThemeConfig/Conversion/PrepareTheme.ts

@@ -13,6 +13,7 @@ import {AddContextToTranslations} from "./AddContextToTranslations";
 
 class SubstituteLayer extends Conversion<(string | LayerConfigJson), LayerConfigJson[]> {
     private readonly _state: DesugaringContext;
+
     constructor(
         state: DesugaringContext,
     ) {
@@ -24,6 +25,7 @@ class SubstituteLayer extends Conversion<(string | LayerConfigJson), LayerConfig
         const errors = []
         const information = []
         const state = this._state
+
         function reportNotFound(name: string) {
             const knownLayers = Array.from(state.sharedLayers.keys())
             const withDistance = knownLayers.map(lname => [lname, Utils.levenshteinDistance(name, lname)])
@@ -222,6 +224,7 @@ class AddImportLayers extends DesugaringStep<LayoutConfigJson> {
 
 export class AddMiniMap extends DesugaringStep<LayerConfigJson> {
     private readonly _state: DesugaringContext;
+
     constructor(state: DesugaringContext,) {
         super("Adds a default 'minimap'-element to the tagrenderings if none of the elements define such a minimap", ["tagRenderings"], "AddMiniMap");
         this._state = state;
@@ -325,6 +328,7 @@ class ApplyOverrideAll extends DesugaringStep<LayoutConfigJson> {
 
 class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
     private readonly _state: DesugaringContext;
+
     constructor(state: DesugaringContext,) {
         super("If a layer has a dependency on another layer, these layers are added automatically on the theme. (For example: defibrillator depends on 'walls_and_buildings' to snap onto. This layer is added automatically)", ["layers"], "AddDependencyLayersToTheme");
         this._state = state;
@@ -418,6 +422,7 @@ class AddDependencyLayersToTheme extends DesugaringStep<LayoutConfigJson> {
 
 class PreparePersonalTheme extends DesugaringStep<LayoutConfigJson> {
     private readonly _state: DesugaringContext;
+
     constructor(state: DesugaringContext) {
         super("Adds every public layer to the personal theme", ["layers"], "PreparePersonalTheme");
         this._state = state;
@@ -472,6 +477,7 @@ export class PrepareTheme extends Fuse<LayoutConfigJson> {
     constructor(state: DesugaringContext) {
         super(
             "Fully prepares and expands a theme",
+
             new AddContextToTransltionsInLayout(),
             new PreparePersonalTheme(state),
             new WarnForUnsubstitutedLayersInTheme(),

Models/ThemeConfig/Conversion/Validation.ts

@@ -217,12 +217,17 @@ class MiscThemeChecks extends DesugaringStep<LayoutConfigJson>{
     
     convert(json: LayoutConfigJson, context: string): { result: LayoutConfigJson; errors?: string[]; warnings?: string[]; information?: string[] } {
         const warnings = []
+        const errors = []
+        if(json.id !== "personal" && (json.layers === undefined || json.layers.length === 0)){
+            errors.push("The theme "+json.id+" has no 'layers' defined ("+context+")")
+        }
         if(json.socialImage === ""){
             warnings.push("Social image for theme "+json.id+" is the emtpy string")
         }
         return {
             result :json,
-            warnings
+            warnings,
+            errors
         };
     }
 }
@@ -231,8 +236,8 @@ export class PrevalidateTheme extends Fuse<LayoutConfigJson> {
 
     constructor() {
         super("Various consistency checks on the raw JSON",
-            new OverrideShadowingCheck(),
-            new MiscThemeChecks()
+            new MiscThemeChecks(),
+            new OverrideShadowingCheck()
         );
 
     }

Models/ThemeConfig/Json/UnitConfigJson.ts

@@ -18,9 +18,12 @@ export default interface UnitConfigJson {
 
 export interface ApplicableUnitJson {
     /**
-     * The canonical value which will be added to the text.
+     * The canonical value which will be added to the value in OSM.
      * e.g. "m" for meters
-     * If the user inputs '42', the canonical value will be added and it'll become '42m'
+     * If the user inputs '42', the canonical value will be added and it'll become '42m'.
+     * 
+     * Important: often, _no_ canonical values are expected, e.g. in the case of 'maxspeed' where 'km/h' is the default.
+     * In this case, an empty string should be used
      */
     canonicalDenomination: string,
     /**

Models/ThemeConfig/LayerConfig.ts

@@ -133,6 +133,9 @@ export default class LayerConfig extends WithContextLoader {
 
         this.allowSplit = json.allowSplit ?? false;
         this.name = Translations.T(json.name, translationContext + ".name");
+        if(json.units!==undefined && !Array.isArray(json.units)){
+            throw "At "+context+".units: the 'units'-section should be a list; you probably have an object there"
+        }
         this.units = (json.units ?? []).map(((unitJson, i) => Unit.fromJson(unitJson, `${context}.unit[${i}]`)))
 
         if (json.description !== undefined) {

scripts/generateLayerOverview.ts

@@ -203,6 +203,8 @@ class LayerOverviewUtils {
             const themePath = themeInfo.path
 
             new PrevalidateTheme().convertStrict(themeFile, themePath)
+            try{
+                
                 themeFile = new PrepareTheme(convertState).convertStrict(themeFile, themePath)
     
                 if(knownImagePaths === undefined){
@@ -213,6 +215,10 @@ class LayerOverviewUtils {
     
                 this.writeTheme(themeFile)
                 fixed.set(themeFile.id, themeFile)
+            }catch(e){
+                console.error("ERROR: could not prepare theme "+themePath+" due to "+e)
+                throw e;
+            }
         }
 
         this.writeSmallOverview(themeFiles.map(tf => {