Refactor anki note building (#1223)

* Move TemplateRendererProxy creation into AnkiNoteBuilder

* Simplify _stringReplaceAsync

* Organize note generation

* Rename API

* Make the template rendering function more generic

7 files changed, 63 insertions, 48 deletions

diff --git a/ext/bg/js/anki-note-builder.js b/ext/bg/js/anki-note-builder.js
index ae608bed..632d9f8a 100644
--- a/ext/bg/js/anki-note-builder.js
+++ b/ext/bg/js/anki-note-builder.js
@@ -17,12 +17,13 @@
 
 /* global
  * DictionaryDataUtil
+ * TemplateRendererProxy
  */
 
 class AnkiNoteBuilder {
-    constructor({renderTemplate}) {
-        this._renderTemplate = renderTemplate;
+    constructor(enabled) {
         this._markerPattern = /\{([\w-]+)\}/g;
+        this._templateRenderer = enabled ? new TemplateRendererProxy() : null;
     }
 
     async createNote({
@@ -49,22 +50,6 @@ class AnkiNoteBuilder {
             duplicateScopeCheckChildren = true;
         }
 
-        const noteFields = {};
-        const note = {
-            fields: noteFields,
-            tags,
-            deckName,
-            modelName,
-            options: {
-                allowDuplicate: !checkForDuplicates,
-                duplicateScope,
-                duplicateScopeOptions: {
-                    deckName: duplicateScopeDeckName,
-                    checkChildren: duplicateScopeCheckChildren
-                }
-            }
-        };
-
         const data = this._createNoteData(definition, mode, context, resultOutputMode, glossaryLayoutMode, compactTags);
         const formattedFieldValuePromises = [];
         for (const [, fieldValue] of fields) {
@@ -73,13 +58,27 @@ class AnkiNoteBuilder {
         }
 
         const formattedFieldValues = await Promise.all(formattedFieldValuePromises);
+        const noteFields = {};
         for (let i = 0, ii = fields.length; i < ii; ++i) {
             const fieldName = fields[i][0];
             const formattedFieldValue = formattedFieldValues[i];
             noteFields[fieldName] = formattedFieldValue;
         }
 
-        return note;
+        return {
+            fields: noteFields,
+            tags,
+            deckName,
+            modelName,
+            options: {
+                allowDuplicate: !checkForDuplicates,
+                duplicateScope,
+                duplicateScopeOptions: {
+                    deckName: duplicateScopeDeckName,
+                    checkChildren: duplicateScopeCheckChildren
+                }
+            }
+        };
     }
 
     containsMarker(fields, marker) {
@@ -146,7 +145,7 @@ class AnkiNoteBuilder {
         });
     }
 
-    _stringReplaceAsync(str, regex, replacer) {
+    async _stringReplaceAsync(str, regex, replacer) {
         let match;
         let index = 0;
         const parts = [];
@@ -155,9 +154,13 @@ class AnkiNoteBuilder {
             index = regex.lastIndex;
         }
         if (parts.length === 0) {
-            return Promise.resolve(str);
+            return str;
         }
         parts.push(str.substring(index));
-        return Promise.all(parts).then((v) => v.join(''));
+        return (await Promise.all(parts)).join('');
+    }
+
+    async _renderTemplate(template, data, marker) {
+        return await this._templateRenderer.render(template, {data, marker}, 'ankiNote');
     }
 }
diff --git a/ext/bg/js/settings/anki-controller.js b/ext/bg/js/settings/anki-controller.js
index 4fba77a6..fbd058ee 100644
--- a/ext/bg/js/settings/anki-controller.js
+++ b/ext/bg/js/settings/anki-controller.js
@@ -26,9 +26,7 @@ class AnkiController {
     constructor(settingsController) {
         this._settingsController = settingsController;
         this._ankiConnect = new AnkiConnect();
-        this._ankiNoteBuilder = new AnkiNoteBuilder({
-            renderTemplate: null
-        });
+        this._ankiNoteBuilder = new AnkiNoteBuilder(false);
         this._selectorObserver = new SelectorObserver({
             selector: '.anki-card',
             ignoreSelector: null,
diff --git a/ext/bg/js/settings/anki-templates-controller.js b/ext/bg/js/settings/anki-templates-controller.js
index 72f1a175..dd07c391 100644
--- a/ext/bg/js/settings/anki-templates-controller.js
+++ b/ext/bg/js/settings/anki-templates-controller.js
@@ -17,7 +17,6 @@
 
 /* global
  * AnkiNoteBuilder
- * TemplateRendererProxy
  * api
  */
 
@@ -34,7 +33,7 @@ class AnkiTemplatesController {
         this._renderFieldInput = null;
         this._renderResult = null;
         this._fieldTemplateResetModal = null;
-        this._templateRenderer = new TemplateRendererProxy();
+        this._ankiNoteBuilder = new AnkiNoteBuilder(true);
     }
 
     async prepare() {
@@ -180,11 +179,8 @@ class AnkiTemplatesController {
                 };
                 let templates = options.anki.fieldTemplates;
                 if (typeof templates !== 'string') { templates = this._defaultFieldTemplates; }
-                const ankiNoteBuilder = new AnkiNoteBuilder({
-                    renderTemplate: this._renderTemplate.bind(this)
-                });
                 const {general: {resultOutputMode, glossaryLayoutMode, compactTags}} = options;
-                const note = await ankiNoteBuilder.createNote({
+                const note = await this._ankiNoteBuilder.createNote({
                     definition,
                     mode,
                     context,
@@ -213,8 +209,4 @@ class AnkiTemplatesController {
             this._fieldTemplatesTextarea.dataset.invalid = `${hasException}`;
         }
     }
-
-    async _renderTemplate(template, data, marker) {
-        return await this._templateRenderer.render(template, data, marker);
-    }
 }
diff --git a/ext/bg/js/template-renderer-frame-api.js b/ext/bg/js/template-renderer-frame-api.js
index ecdc7268..4936a2af 100644
--- a/ext/bg/js/template-renderer-frame-api.js
+++ b/ext/bg/js/template-renderer-frame-api.js
@@ -19,7 +19,7 @@ class TemplateRendererFrameApi {
     constructor(templateRenderer) {
         this._templateRenderer = templateRenderer;
         this._windowMessageHandlers = new Map([
-            ['renderHandlebarsTemplate', {async: true, handler: this._onRenderHandlebarsTemplate.bind(this)}]
+            ['render', {async: true, handler: this._onRender.bind(this)}]
         ]);
     }
 
@@ -27,6 +27,8 @@ class TemplateRendererFrameApi {
         window.addEventListener('message', this._onWindowMessage.bind(this), false);
     }
 
+    // Private
+
     _onWindowMessage(e) {
         const {source, data: {action, params, id}} = e;
         const messageHandler = this._windowMessageHandlers.get(action);
@@ -51,8 +53,8 @@ class TemplateRendererFrameApi {
         source.postMessage({action: `${action}.response`, params: response, id}, '*');
     }
 
-    async _onRenderHandlebarsTemplate({template, data, marker}) {
-        return await this._templateRenderer.render(template, data, marker);
+    async _onRender({template, data, type}) {
+        return await this._templateRenderer.render(template, data, type);
     }
 
     _errorToJson(error) {
diff --git a/ext/bg/js/template-renderer-frame-main.js b/ext/bg/js/template-renderer-frame-main.js
index 1bd7e086..92a8095e 100644
--- a/ext/bg/js/template-renderer-frame-main.js
+++ b/ext/bg/js/template-renderer-frame-main.js
@@ -24,6 +24,12 @@
 (() => {
     const japaneseUtil = new JapaneseUtil(null);
     const templateRenderer = new TemplateRenderer(japaneseUtil);
+    templateRenderer.registerDataType('ankiNote', {
+        modifier: ({data, marker}) => {
+            data.marker = marker;
+            return data;
+        }
+    });
     const api = new TemplateRendererFrameApi(templateRenderer);
     api.prepare();
 })();
diff --git a/ext/bg/js/template-renderer-proxy.js b/ext/bg/js/template-renderer-proxy.js
index 04b53ce7..21d45a94 100644
--- a/ext/bg/js/template-renderer-proxy.js
+++ b/ext/bg/js/template-renderer-proxy.js
@@ -25,9 +25,9 @@ class TemplateRendererProxy {
         this._invocations = new Set();
     }
 
-    async render(template, data, marker) {
+    async render(template, data, type) {
         await this._prepareFrame();
-        return await this._invoke('renderHandlebarsTemplate', {template, data, marker});
+        return await this._invoke('render', {template, data, type});
     }
 
     // Private
diff --git a/ext/bg/js/template-renderer.js b/ext/bg/js/template-renderer.js
index c3e5470e..4bf9448e 100644
--- a/ext/bg/js/template-renderer.js
+++ b/ext/bg/js/template-renderer.js
@@ -26,9 +26,14 @@ class TemplateRenderer {
         this._cacheMaxSize = 5;
         this._helpersRegistered = false;
         this._stateStack = null;
+        this._dataTypes = new Map();
     }
 
-    async render(template, data, marker) {
+    registerDataType(name, {modifier=null, modifierPost=null}) {
+        this._dataTypes.set(name, {modifier, modifierPost});
+    }
+
+    async render(template, data, type) {
         if (!this._helpersRegistered) {
             this._registerHelpers();
             this._helpersRegistered = true;
@@ -42,18 +47,27 @@ class TemplateRenderer {
             cache.set(template, instance);
         }
 
-        const markerPre = data.marker;
-        const markerPreHas = Object.prototype.hasOwnProperty.call(data, 'marker');
+        let modifier = null;
+        let modifierPost = null;
+        if (typeof type === 'string') {
+            const typeInfo = this._dataTypes.get(type);
+            if (typeof typeInfo !== 'undefined') {
+                ({modifier, modifierPost} = typeInfo);
+            }
+        }
+
         try {
+            if (typeof modifier === 'function') {
+                data = modifier(data);
+            }
+
             this._stateStack = [new Map()];
-            data.marker = marker;
             return instance(data).trim();
         } finally {
             this._stateStack = null;
-            if (markerPreHas) {
-                data.marker = markerPre;
-            } else {
-                delete data.marker;
+
+            if (typeof modifierPost === 'function') {
+                modifierPost(data);
             }
         }
     }