Query parser generator refactor (#1006)

* Simplify select generation

* Refactor text generation

* Change optional argument

* Remove query-parser-templates.html

* Simplify prepare

* Simplify preview

4 files changed, 53 insertions, 72 deletions

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 5462d4c9..fe9c9c76 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -100,7 +100,6 @@ class Backend {
             ['clipboardGet',                 {async: true,  contentScript: true,  handler: this._onApiClipboardGet.bind(this)}],
             ['clipboardGetImage',            {async: true,  contentScript: true,  handler: this._onApiClipboardImageGet.bind(this)}],
             ['getDisplayTemplatesHtml',      {async: true,  contentScript: true,  handler: this._onApiGetDisplayTemplatesHtml.bind(this)}],
-            ['getQueryParserTemplatesHtml',  {async: true,  contentScript: true,  handler: this._onApiGetQueryParserTemplatesHtml.bind(this)}],
             ['getZoom',                      {async: true,  contentScript: true,  handler: this._onApiGetZoom.bind(this)}],
             ['getDefaultAnkiFieldTemplates', {async: false, contentScript: true,  handler: this._onApiGetDefaultAnkiFieldTemplates.bind(this)}],
             ['getDictionaryInfo',            {async: true,  contentScript: false, handler: this._onApiGetDictionaryInfo.bind(this)}],
@@ -594,10 +593,6 @@ class Backend {
         return await this._fetchAsset('/mixed/display-templates.html');
     }
 
-    async _onApiGetQueryParserTemplatesHtml() {
-        return await this._fetchAsset('/bg/query-parser-templates.html');
-    }
-
     _onApiGetZoom(params, sender) {
         if (!sender || !sender.tab) {
             return Promise.reject(new Error('Invalid tab'));
diff --git a/ext/bg/js/query-parser-generator.js b/ext/bg/js/query-parser-generator.js
index 3f49184b..d53183ba 100644
--- a/ext/bg/js/query-parser-generator.js
+++ b/ext/bg/js/query-parser-generator.js
@@ -15,76 +15,78 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-/* global
- * HtmlTemplateCollection
- * api
- */
-
 class QueryParserGenerator {
-    constructor() {
-        this._templates = null;
-    }
-
-    async prepare() {
-        const html = await api.getQueryParserTemplatesHtml();
-        this._templates = new HtmlTemplateCollection(html);
-    }
-
-    createParseResult(terms, preview=false) {
+    createParseResult(terms, preview) {
+        const type = preview ? 'preview' : 'normal';
         const fragment = document.createDocumentFragment();
         for (const term of terms) {
-            const termContainer = this._templates.instantiate(preview ? 'term-preview' : 'term');
+            const termNode = document.createElement('span');
+            termNode.className = 'query-parser-term';
+            termNode.dataset.type = type;
             for (const segment of term) {
                 if (!segment.text.trim()) { continue; }
                 if (!segment.reading.trim()) {
-                    termContainer.appendChild(this.createSegmentText(segment.text));
+                    this._addSegmentText(segment.text, termNode);
                 } else {
-                    termContainer.appendChild(this.createSegment(segment));
+                    termNode.appendChild(this._createSegment(segment));
                 }
             }
-            fragment.appendChild(termContainer);
-        }
-        return fragment;
-    }
-
-    createSegment(segment) {
-        const segmentContainer = this._templates.instantiate('segment');
-        const segmentTextContainer = segmentContainer.querySelector('.query-parser-segment-text');
-        const segmentReadingContainer = segmentContainer.querySelector('.query-parser-segment-reading');
-        segmentTextContainer.appendChild(this.createSegmentText(segment.text));
-        segmentReadingContainer.textContent = segment.reading;
-        return segmentContainer;
-    }
-
-    createSegmentText(text) {
-        const fragment = document.createDocumentFragment();
-        for (const chr of text) {
-            const charContainer = this._templates.instantiate('char');
-            charContainer.textContent = chr;
-            fragment.appendChild(charContainer);
+            fragment.appendChild(termNode);
         }
         return fragment;
     }
 
     createParserSelect(parseResults, selectedParser) {
-        const selectContainer = this._templates.instantiate('select');
+        const select = document.createElement('select');
+        select.className = 'query-parser-select form-control';
         for (const parseResult of parseResults) {
-            const optionContainer = this._templates.instantiate('select-option');
-            optionContainer.value = parseResult.id;
+            const option = document.createElement('option');
+            option.className = 'query-parser-select-option';
+            option.value = parseResult.id;
             switch (parseResult.source) {
                 case 'scanning-parser':
-                    optionContainer.textContent = 'Scanning parser';
+                    option.textContent = 'Scanning parser';
                     break;
                 case 'mecab':
-                    optionContainer.textContent = `MeCab: ${parseResult.dictionary}`;
+                    option.textContent = `MeCab: ${parseResult.dictionary}`;
                     break;
                 default:
-                    optionContainer.textContent = 'Unrecognized dictionary';
+                    option.textContent = 'Unrecognized dictionary';
                     break;
             }
-            optionContainer.defaultSelected = selectedParser === parseResult.id;
-            selectContainer.appendChild(optionContainer);
+            option.defaultSelected = selectedParser === parseResult.id;
+            select.appendChild(option);
+        }
+        return select;
+    }
+
+    // Private
+
+    _createSegment(segment) {
+        const segmentNode = document.createElement('ruby');
+        segmentNode.className = 'query-parser-segment';
+
+        const textNode = document.createElement('span');
+        textNode.className = 'query-parser-segment-text';
+
+        const readingNode = document.createElement('rt');
+        readingNode.className = 'query-parser-segment-reading';
+
+        segmentNode.appendChild(textNode);
+        segmentNode.appendChild(readingNode);
+
+        this._addSegmentText(segment.text, textNode);
+        readingNode.textContent = segment.reading;
+
+        return segmentNode;
+    }
+
+    _addSegmentText(text, container) {
+        for (const character of text) {
+            const node = document.createElement('span');
+            node.className = 'query-parser-char';
+            node.textContent = character;
+            container.appendChild(node);
         }
-        return selectContainer;
     }
 }
diff --git a/ext/bg/js/query-parser.js b/ext/bg/js/query-parser.js
index dc3cc581..8f17a5c1 100644
--- a/ext/bg/js/query-parser.js
+++ b/ext/bg/js/query-parser.js
@@ -44,8 +44,7 @@ class QueryParser extends EventDispatcher {
         });
     }
 
-    async prepare() {
-        await this._queryParserGenerator.prepare();
+    prepare() {
         this._textScanner.prepare();
         this._textScanner.on('searched', this._onSearched.bind(this));
     }
@@ -125,13 +124,9 @@ class QueryParser extends EventDispatcher {
     }
 
     _setPreview(text) {
-        const previewTerms = [];
-        for (let i = 0, ii = text.length; i < ii; i += 2) {
-            const tempText = text.substring(i, i + 2);
-            previewTerms.push([{text: tempText, reading: ''}]);
-        }
+        const terms = [[{text, reading: ''}]];
         this._queryParser.textContent = '';
-        this._queryParser.appendChild(this._queryParserGenerator.createParseResult(previewTerms, true));
+        this._queryParser.appendChild(this._queryParserGenerator.createParseResult(terms, true));
     }
 
     _renderParserSelect() {
@@ -148,6 +143,6 @@ class QueryParser extends EventDispatcher {
         const parseResult = this._getParseResult();
         this._queryParser.textContent = '';
         if (!parseResult) { return; }
-        this._queryParser.appendChild(this._queryParserGenerator.createParseResult(parseResult.content));
+        this._queryParser.appendChild(this._queryParserGenerator.createParseResult(parseResult.content, false));
     }
 }
diff --git a/ext/bg/query-parser-templates.html b/ext/bg/query-parser-templates.html
deleted file mode 100644
index 7cab16a9..00000000
--- a/ext/bg/query-parser-templates.html
+++ /dev/null
@@ -1,11 +0,0 @@
-<!DOCTYPE html><html><head></head><body>
-
-<template id="term-template"><span class="query-parser-term" data-type="normal"></span></template>
-<template id="term-preview-template"><span class="query-parser-term" data-type="preview"></span></template>
-<template id="segment-template"><ruby class="query-parser-segment"><span class="query-parser-segment-text"></span><rt class="query-parser-segment-reading"></rt></ruby></template>
-<template id="char-template"><span class="query-parser-char"></span></template>
-
-<template id="select-template"><select class="query-parser-select form-control"></select></template>
-<template id="select-option-template"><option class="query-parser-select-option"></option></template>
-
-</body></html>