Settings binder (#542)

* Fix _modifySetting being async

* Return values for modifySettings's set and splice actions

* Add apiGetSettings

* Create a class which can accumulate tasks to run in bulk

* Create a class which binds input elements to customizable sources

* Create class which binds input elements to settings

* Add support for value transforms

* Remove redundant ObjectPropertyAccessor.getPathArray

* Fix not using correct types for input.min/max/step

* Fix wrong condition

* Use api object

1 files changed, 122 insertions, 0 deletions

diff --git a/ext/bg/js/settings/dom-settings-binder.js b/ext/bg/js/settings/dom-settings-binder.js
new file mode 100644
index 00000000..0441ec29
--- /dev/null
+++ b/ext/bg/js/settings/dom-settings-binder.js
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2020  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * DOMDataBinder
+ * api
+ * getOptionsContext
+ */
+
+class DOMSettingsBinder {
+    constructor({getOptionsContext, transforms=null}) {
+        this._getOptionsContext = getOptionsContext;
+        this._defaultScope = 'profile';
+        this._dataBinder = new DOMDataBinder({
+            selector: '[data-setting]',
+            createElementMetadata: this._createElementMetadata.bind(this),
+            compareElementMetadata: this._compareElementMetadata.bind(this),
+            getValues: this._getValues.bind(this),
+            setValues: this._setValues.bind(this)
+        });
+        this._transforms = new Map(transforms !== null ? transforms : []);
+    }
+
+    observe(element) {
+        this._dataBinder.observe(element);
+    }
+
+    disconnect() {
+        this._dataBinder.disconnect();
+    }
+
+    refresh() {
+        this._dataBinder.refresh();
+    }
+
+    // Private
+
+    _createElementMetadata(element) {
+        return {
+            path: element.dataset.setting,
+            scope: element.dataset.scope,
+            transformPre: element.dataset.transformPre,
+            transformPost: element.dataset.transformPost
+        };
+    }
+
+    _compareElementMetadata(metadata1, metadata2) {
+        return (
+            metadata1.path === metadata2.path &&
+            metadata1.scope === metadata2.scope &&
+            metadata1.transformPre === metadata2.transformPre &&
+            metadata1.transformPost === metadata2.transformPost
+        );
+    }
+
+    async _getValues(targets) {
+        const settingsTargets = [];
+        for (const {metadata: {path, scope}} of targets) {
+            const target = {
+                path,
+                scope: scope || this._defaultScope
+            };
+            if (target.scope === 'profile') {
+                target.optionsContext = this._getOptionsContext();
+            }
+            settingsTargets.push(target);
+        }
+        return this._transformResults(await api.getSettings(settingsTargets), targets);
+    }
+
+    async _setValues(targets) {
+        const settingsTargets = [];
+        for (const {metadata, value, element} of targets) {
+            const {path, scope, transformPre} = metadata;
+            const target = {
+                path,
+                scope: scope || this._defaultScope,
+                action: 'set',
+                value: this._transform(value, transformPre, metadata, element)
+            };
+            if (target.scope === 'profile') {
+                target.optionsContext = this._getOptionsContext();
+            }
+            settingsTargets.push(target);
+        }
+        return this._transformResults(await api.modifySettings(settingsTargets), targets);
+    }
+
+    _transform(value, transform, metadata, element) {
+        if (typeof transform === 'string') {
+            const transformFunction = this._transforms.get(transform);
+            if (typeof transformFunction !== 'undefined') {
+                value = transformFunction(value, metadata, element);
+            }
+        }
+        return value;
+    }
+
+    _transformResults(values, targets) {
+        return values.map((value, i) => {
+            const error = value.error;
+            if (error) { return jsonToError(error); }
+            const {metadata, element} = targets[i];
+            const result = this._transform(value.result, metadata.transformPost, metadata, element);
+            return {result};
+        });
+    }
+}