Modifier key platform names (#519)

* wip

* add environment class

* use Environment class

* use Environment for scanning modifier options

* remove Environment in favor of API

* await promise

* use modifier symbols on macOS

* fix key separator issues

* if else to switch

* simplify variable names

8 files changed, 286 insertions, 163 deletions

diff --git a/ext/bg/background.html b/ext/bg/background.html
index 7cb76ec3..ca35a3c6 100644
--- a/ext/bg/background.html
+++ b/ext/bg/background.html
@@ -21,6 +21,7 @@
 
         <script src="/mixed/js/core.js"></script>
         <script src="/mixed/js/dom.js"></script>
+        <script src="/mixed/js/environment.js"></script>
         <script src="/mixed/js/japanese.js"></script>
 
         <script src="/bg/js/anki.js"></script>
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 9936baf8..557ceb29 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -24,6 +24,7 @@
  * ClipboardMonitor
  * Database
  * DictionaryImporter
+ * Environment
  * JsonSchema
  * Mecab
  * ObjectPropertyAccessor
@@ -35,6 +36,7 @@
  * optionsLoad
  * optionsSave
  * profileConditionsDescriptor
+ * profileConditionsDescriptorPromise
  * requestJson
  * requestText
  * utilIsolate
@@ -42,6 +44,7 @@
 
 class Backend {
     constructor() {
+        this.environment = new Environment();
         this.database = new Database();
         this.dictionaryImporter = new DictionaryImporter();
         this.translator = new Translator(this.database);
@@ -100,7 +103,7 @@ class Backend {
             ['broadcastTab',                 {async: false, contentScript: true,  handler: this._onApiBroadcastTab.bind(this)}],
             ['frameInformationGet',          {async: true,  contentScript: true,  handler: this._onApiFrameInformationGet.bind(this)}],
             ['injectStylesheet',             {async: true,  contentScript: true,  handler: this._onApiInjectStylesheet.bind(this)}],
-            ['getEnvironmentInfo',           {async: true,  contentScript: true,  handler: this._onApiGetEnvironmentInfo.bind(this)}],
+            ['getEnvironmentInfo',           {async: false, contentScript: true,  handler: this._onApiGetEnvironmentInfo.bind(this)}],
             ['clipboardGet',                 {async: true,  contentScript: true,  handler: this._onApiClipboardGet.bind(this)}],
             ['getDisplayTemplatesHtml',      {async: true,  contentScript: true,  handler: this._onApiGetDisplayTemplatesHtml.bind(this)}],
             ['getQueryParserTemplatesHtml',  {async: true,  contentScript: true,  handler: this._onApiGetQueryParserTemplatesHtml.bind(this)}],
@@ -140,9 +143,12 @@ class Backend {
             }, 1000);
             this._updateBadge();
 
+            await this.environment.prepare();
             await this.database.prepare();
             await this.translator.prepare();
 
+            await profileConditionsDescriptorPromise;
+
             this.optionsSchema = await requestJson(chrome.runtime.getURL('/bg/data/options-schema.json'), 'GET');
             this.defaultAnkiFieldTemplates = await requestText(chrome.runtime.getURL('/bg/data/default-anki-field-templates.handlebars'), 'GET');
             this.options = await optionsLoad();
@@ -635,15 +641,8 @@ class Backend {
         });
     }
 
-    async _onApiGetEnvironmentInfo() {
-        const browser = await Backend._getBrowser();
-        const platform = await new Promise((resolve) => chrome.runtime.getPlatformInfo(resolve));
-        return {
-            browser,
-            platform: {
-                os: platform.os
-            }
-        };
+    _onApiGetEnvironmentInfo() {
+        return this.environment.getInfo();
     }
 
     async _onApiClipboardGet() {
@@ -659,7 +658,7 @@ class Backend {
               being an extension with clipboard permissions. It effectively asks for the
               non-extension permission for clipboard access.
         */
-        const browser = await Backend._getBrowser();
+        const {browser} = this.environment.getInfo();
         if (browser === 'firefox' || browser === 'firefox-mobile') {
             return await navigator.clipboard.readText();
         } else {
@@ -1211,23 +1210,4 @@ class Backend {
             // Edge throws exception for no reason here.
         }
     }
-
-    static async _getBrowser() {
-        if (EXTENSION_IS_BROWSER_EDGE) {
-            return 'edge';
-        }
-        if (typeof browser !== 'undefined') {
-            try {
-                const info = await browser.runtime.getBrowserInfo();
-                if (info.name === 'Fennec') {
-                    return 'firefox-mobile';
-                }
-            } catch (e) {
-                // NOP
-            }
-            return 'firefox';
-        } else {
-            return 'chrome';
-        }
-    }
 }
diff --git a/ext/bg/js/profile-conditions.js b/ext/bg/js/profile-conditions.js
index 32309c64..97e09f1c 100644
--- a/ext/bg/js/profile-conditions.js
+++ b/ext/bg/js/profile-conditions.js
@@ -15,6 +15,9 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+/* global
+ * Environment
+ */
 
 function _profileConditionTestDomain(urlDomain, domain) {
     return (
@@ -36,135 +39,140 @@ function _profileConditionTestDomainList(url, domainList) {
     return false;
 }
 
-const _profileModifierKeys = [
-    {optionValue: 'alt',   name: 'Alt'},
-    {optionValue: 'ctrl',  name: 'Ctrl'},
-    {optionValue: 'shift', name: 'Shift'}
-];
+let profileConditionsDescriptor = null;
 
-if (!hasOwn(window, 'netscape')) {
-    _profileModifierKeys.push({optionValue: 'meta',  name: 'Meta'});
-}
+const profileConditionsDescriptorPromise = (async () => {
+    const environment = new Environment();
+    await environment.prepare();
 
-const _profileModifierValueToName = new Map(
-    _profileModifierKeys.map(({optionValue, name}) => [optionValue, name])
-);
+    const modifiers = environment.getInfo().modifiers;
+    const modifierSeparator = modifiers.separator;
+    const modifierKeyValues = modifiers.keys.map(
+        ({value, name}) => ({optionValue: value, name})
+    );
 
-const _profileModifierNameToValue = new Map(
-    _profileModifierKeys.map(({optionValue, name}) => [name, optionValue])
-);
+    const modifierValueToName = new Map(
+        modifierKeyValues.map(({optionValue, name}) => [optionValue, name])
+    );
 
-const profileConditionsDescriptor = {
-    popupLevel: {
-        name: 'Popup Level',
-        description: 'Use profile depending on the level of the popup.',
-        placeholder: 'Number',
-        type: 'number',
-        step: 1,
-        defaultValue: 0,
-        defaultOperator: 'equal',
-        transform: (optionValue) => parseInt(optionValue, 10),
-        transformReverse: (transformedOptionValue) => `${transformedOptionValue}`,
-        validateTransformed: (transformedOptionValue) => Number.isFinite(transformedOptionValue),
-        operators: {
-            equal: {
-                name: '=',
-                test: ({depth}, optionValue) => (depth === optionValue)
-            },
-            notEqual: {
-                name: '\u2260',
-                test: ({depth}, optionValue) => (depth !== optionValue)
-            },
-            lessThan: {
-                name: '<',
-                test: ({depth}, optionValue) => (depth < optionValue)
-            },
-            greaterThan: {
-                name: '>',
-                test: ({depth}, optionValue) => (depth > optionValue)
-            },
-            lessThanOrEqual: {
-                name: '\u2264',
-                test: ({depth}, optionValue) => (depth <= optionValue)
-            },
-            greaterThanOrEqual: {
-                name: '\u2265',
-                test: ({depth}, optionValue) => (depth >= optionValue)
+    const modifierNameToValue = new Map(
+        modifierKeyValues.map(({optionValue, name}) => [name, optionValue])
+    );
+
+    profileConditionsDescriptor = {
+        popupLevel: {
+            name: 'Popup Level',
+            description: 'Use profile depending on the level of the popup.',
+            placeholder: 'Number',
+            type: 'number',
+            step: 1,
+            defaultValue: 0,
+            defaultOperator: 'equal',
+            transform: (optionValue) => parseInt(optionValue, 10),
+            transformReverse: (transformedOptionValue) => `${transformedOptionValue}`,
+            validateTransformed: (transformedOptionValue) => Number.isFinite(transformedOptionValue),
+            operators: {
+                equal: {
+                    name: '=',
+                    test: ({depth}, optionValue) => (depth === optionValue)
+                },
+                notEqual: {
+                    name: '\u2260',
+                    test: ({depth}, optionValue) => (depth !== optionValue)
+                },
+                lessThan: {
+                    name: '<',
+                    test: ({depth}, optionValue) => (depth < optionValue)
+                },
+                greaterThan: {
+                    name: '>',
+                    test: ({depth}, optionValue) => (depth > optionValue)
+                },
+                lessThanOrEqual: {
+                    name: '\u2264',
+                    test: ({depth}, optionValue) => (depth <= optionValue)
+                },
+                greaterThanOrEqual: {
+                    name: '\u2265',
+                    test: ({depth}, optionValue) => (depth >= optionValue)
+                }
             }
-        }
-    },
-    url: {
-        name: 'URL',
-        description: 'Use profile depending on the URL of the current website.',
-        defaultOperator: 'matchDomain',
-        operators: {
-            matchDomain: {
-                name: 'Matches Domain',
-                placeholder: 'Comma separated list of domains',
-                defaultValue: 'example.com',
-                transformCache: {},
-                transform: (optionValue) => optionValue.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0),
-                transformReverse: (transformedOptionValue) => transformedOptionValue.join(', '),
-                validateTransformed: (transformedOptionValue) => (transformedOptionValue.length > 0),
-                test: ({url}, transformedOptionValue) => _profileConditionTestDomainList(url, transformedOptionValue)
-            },
-            matchRegExp: {
-                name: 'Matches RegExp',
-                placeholder: 'Regular expression',
-                defaultValue: 'example\\.com',
-                transformCache: {},
-                transform: (optionValue) => new RegExp(optionValue, 'i'),
-                transformReverse: (transformedOptionValue) => transformedOptionValue.source,
-                test: ({url}, transformedOptionValue) => (transformedOptionValue !== null && transformedOptionValue.test(url))
+        },
+        url: {
+            name: 'URL',
+            description: 'Use profile depending on the URL of the current website.',
+            defaultOperator: 'matchDomain',
+            operators: {
+                matchDomain: {
+                    name: 'Matches Domain',
+                    placeholder: 'Comma separated list of domains',
+                    defaultValue: 'example.com',
+                    transformCache: {},
+                    transform: (optionValue) => optionValue.split(/[,;\s]+/).map((v) => v.trim().toLowerCase()).filter((v) => v.length > 0),
+                    transformReverse: (transformedOptionValue) => transformedOptionValue.join(', '),
+                    validateTransformed: (transformedOptionValue) => (transformedOptionValue.length > 0),
+                    test: ({url}, transformedOptionValue) => _profileConditionTestDomainList(url, transformedOptionValue)
+                },
+                matchRegExp: {
+                    name: 'Matches RegExp',
+                    placeholder: 'Regular expression',
+                    defaultValue: 'example\\.com',
+                    transformCache: {},
+                    transform: (optionValue) => new RegExp(optionValue, 'i'),
+                    transformReverse: (transformedOptionValue) => transformedOptionValue.source,
+                    test: ({url}, transformedOptionValue) => (transformedOptionValue !== null && transformedOptionValue.test(url))
+                }
             }
-        }
-    },
-    modifierKeys: {
-        name: 'Modifier Keys',
-        description: 'Use profile depending on the active modifier keys.',
-        values: _profileModifierKeys,
-        defaultOperator: 'are',
-        operators: {
-            are: {
-                name: 'are',
-                placeholder: 'Press one or more modifier keys here',
-                defaultValue: [],
-                type: 'keyMulti',
-                transformInput: (optionValue) => optionValue
-                    .split(' + ')
-                    .filter((v) => v.length > 0)
-                    .map((v) => _profileModifierNameToValue.get(v)),
-                transformReverse: (transformedOptionValue) => transformedOptionValue
-                    .map((v) => _profileModifierValueToName.get(v))
-                    .join(' + '),
-                test: ({modifierKeys}, optionValue) => areSetsEqual(new Set(modifierKeys), new Set(optionValue))
-            },
-            areNot: {
-                name: 'are not',
-                placeholder: 'Press one or more modifier keys here',
-                defaultValue: [],
-                type: 'keyMulti',
-                transformInput: (optionValue) => optionValue
-                    .split(' + ')
-                    .filter((v) => v.length > 0)
-                    .map((v) => _profileModifierNameToValue.get(v)),
-                transformReverse: (transformedOptionValue) => transformedOptionValue
-                    .map((v) => _profileModifierValueToName.get(v))
-                    .join(' + '),
-                test: ({modifierKeys}, optionValue) => !areSetsEqual(new Set(modifierKeys), new Set(optionValue))
-            },
-            include: {
-                name: 'include',
-                type: 'select',
-                defaultValue: 'alt',
-                test: ({modifierKeys}, optionValue) => modifierKeys.includes(optionValue)
-            },
-            notInclude: {
-                name: 'don\'t include',
-                type: 'select',
-                defaultValue: 'alt',
-                test: ({modifierKeys}, optionValue) => !modifierKeys.includes(optionValue)
+        },
+        modifierKeys: {
+            name: 'Modifier Keys',
+            description: 'Use profile depending on the active modifier keys.',
+            values: modifierKeyValues,
+            defaultOperator: 'are',
+            operators: {
+                are: {
+                    name: 'are',
+                    placeholder: 'Press one or more modifier keys here',
+                    defaultValue: [],
+                    type: 'keyMulti',
+                    keySeparator: modifierSeparator,
+                    transformInput: (optionValue) => optionValue
+                        .split(modifierSeparator)
+                        .filter((v) => v.length > 0)
+                        .map((v) => modifierNameToValue.get(v)),
+                    transformReverse: (transformedOptionValue) => transformedOptionValue
+                        .map((v) => modifierValueToName.get(v))
+                        .join(modifierSeparator),
+                    test: ({modifierKeys}, optionValue) => areSetsEqual(new Set(modifierKeys), new Set(optionValue))
+                },
+                areNot: {
+                    name: 'are not',
+                    placeholder: 'Press one or more modifier keys here',
+                    defaultValue: [],
+                    type: 'keyMulti',
+                    keySeparator: modifierSeparator,
+                    transformInput: (optionValue) => optionValue
+                        .split(modifierSeparator)
+                        .filter((v) => v.length > 0)
+                        .map((v) => modifierNameToValue.get(v)),
+                    transformReverse: (transformedOptionValue) => transformedOptionValue
+                        .map((v) => modifierValueToName.get(v))
+                        .join(modifierSeparator),
+                    test: ({modifierKeys}, optionValue) => !areSetsEqual(new Set(modifierKeys), new Set(optionValue))
+                },
+                include: {
+                    name: 'include',
+                    type: 'select',
+                    defaultValue: 'alt',
+                    test: ({modifierKeys}, optionValue) => modifierKeys.includes(optionValue)
+                },
+                notInclude: {
+                    name: 'don\'t include',
+                    type: 'select',
+                    defaultValue: 'alt',
+                    test: ({modifierKeys}, optionValue) => !modifierKeys.includes(optionValue)
+                }
             }
         }
-    }
-};
+    };
+})();
diff --git a/ext/bg/js/settings/conditions-ui.js b/ext/bg/js/settings/conditions-ui.js
index 0670de5a..031689a7 100644
--- a/ext/bg/js/settings/conditions-ui.js
+++ b/ext/bg/js/settings/conditions-ui.js
@@ -310,10 +310,14 @@ ConditionsUI.Condition = class Condition {
         inputInner.prop('readonly', true);
 
         let values = [];
+        let keySeparator = ' + ';
         for (const object of objects) {
             if (hasOwn(object, 'values')) {
                 values = object.values;
             }
+            if (hasOwn(object, 'keySeparator')) {
+                keySeparator = object.keySeparator;
+            }
         }
 
         const pressedKeyIndices = new Set();
@@ -347,7 +351,7 @@ ConditionsUI.Condition = class Condition {
                 }
             }
 
-            const inputValue = [...pressedKeyIndices].map((i) => values[i].name).join(' + ');
+            const inputValue = [...pressedKeyIndices].map((i) => values[i].name).join(keySeparator);
             inputInner.val(inputValue);
             inputInner.change();
         };
diff --git a/ext/bg/js/settings/main.js b/ext/bg/js/settings/main.js
index cf75d629..61395b1c 100644
--- a/ext/bg/js/settings/main.js
+++ b/ext/bg/js/settings/main.js
@@ -22,6 +22,7 @@
  * ankiTemplatesInitialize
  * ankiTemplatesUpdateValue
  * apiForwardLogsToBackend
+ * apiGetEnvironmentInfo
  * apiOptionsSave
  * appearanceInitialize
  * audioSettingsInitialize
@@ -285,6 +286,23 @@ function showExtensionInformation() {
     node.textContent = `${manifest.name} v${manifest.version}`;
 }
 
+async function settingsPopulateModifierKeys() {
+    const scanModifierKeySelect = document.querySelector('#scan-modifier-key');
+    scanModifierKeySelect.textContent = '';
+
+    const environment = await apiGetEnvironmentInfo();
+    const modifierKeys = [
+        {value: 'none', name: 'None'},
+        ...environment.modifiers.keys
+    ];
+    for (const {value, name} of modifierKeys) {
+        const option = document.createElement('option');
+        option.value = value;
+        option.textContent = name;
+        scanModifierKeySelect.appendChild(option);
+    }
+}
+
 
 async function onReady() {
     apiForwardLogsToBackend();
@@ -292,6 +310,7 @@ async function onReady() {
 
     showExtensionInformation();
 
+    await settingsPopulateModifierKeys();
     formSetupEventListeners();
     appearanceInitialize();
     await audioSettingsInitialize();
diff --git a/ext/bg/js/settings/profiles.js b/ext/bg/js/settings/profiles.js
index 3f4b1da7..bdf5a13d 100644
--- a/ext/bg/js/settings/profiles.js
+++ b/ext/bg/js/settings/profiles.js
@@ -23,6 +23,7 @@
  * getOptionsFullMutable
  * getOptionsMutable
  * profileConditionsDescriptor
+ * profileConditionsDescriptorPromise
  * settingsSaveOptions
  * utilBackgroundIsolate
  */
@@ -98,6 +99,7 @@ async function profileFormWrite(optionsFull) {
         profileConditionsContainer.cleanup();
     }
 
+    await profileConditionsDescriptorPromise;
     profileConditionsContainer = new ConditionsUI.Container(
         profileConditionsDescriptor,
         'popupLevel',
@@ -128,7 +130,7 @@ function profileOptionsPopulateSelect(select, profiles, currentValue, ignoreIndi
 }
 
 async function profileOptionsUpdateTarget(optionsFull) {
-    profileFormWrite(optionsFull);
+    await profileFormWrite(optionsFull);
 
     const optionsContext = getOptionsContext();
     const options = await getOptionsMutable(optionsContext);
diff --git a/ext/bg/settings.html b/ext/bg/settings.html
index a0981687..3ce91f12 100644
--- a/ext/bg/settings.html
+++ b/ext/bg/settings.html
@@ -412,13 +412,7 @@
 
                 <div class="form-group">
                     <label for="scan-modifier-key">Scan modifier key</label>
-                    <select class="form-control" id="scan-modifier-key">
-                        <option value="none">None</option>
-                        <option value="alt">Alt</option>
-                        <option value="ctrl">Ctrl</option>
-                        <option value="shift">Shift</option>
-                        <option data-hide-for-browser="firefox firefox-mobile" value="meta">Meta</option>
-                    </select>
+                    <select class="form-control" id="scan-modifier-key"></select>
                 </div>
             </div>
 
@@ -1131,6 +1125,7 @@
 
         <script src="/mixed/js/core.js"></script>
         <script src="/mixed/js/dom.js"></script>
+        <script src="/mixed/js/environment.js"></script>
         <script src="/mixed/js/api.js"></script>
         <script src="/mixed/js/japanese.js"></script>
 
diff --git a/ext/mixed/js/environment.js b/ext/mixed/js/environment.js
new file mode 100644
index 00000000..e5bc20a7
--- /dev/null
+++ b/ext/mixed/js/environment.js
@@ -0,0 +1,114 @@
+/*
+ * 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/>.
+ */
+
+
+class Environment {
+    constructor() {
+        this._cachedEnvironmentInfo = null;
+    }
+
+    async prepare() {
+        this._cachedEnvironmentInfo = await this._loadEnvironmentInfo();
+    }
+
+    getInfo() {
+        if (this._cachedEnvironmentInfo === null) { throw new Error('Not prepared'); }
+        return this._cachedEnvironmentInfo;
+    }
+
+    async _loadEnvironmentInfo() {
+        const browser = await this._getBrowser();
+        const platform = await new Promise((resolve) => chrome.runtime.getPlatformInfo(resolve));
+        const modifierInfo = this._getModifierInfo(browser, platform.os);
+        return {
+            browser,
+            platform: {
+                os: platform.os
+            },
+            modifiers: modifierInfo
+        };
+    }
+
+    async _getBrowser() {
+        if (EXTENSION_IS_BROWSER_EDGE) {
+            return 'edge';
+        }
+        if (typeof browser !== 'undefined') {
+            try {
+                const info = await browser.runtime.getBrowserInfo();
+                if (info.name === 'Fennec') {
+                    return 'firefox-mobile';
+                }
+            } catch (e) {
+                // NOP
+            }
+            return 'firefox';
+        } else {
+            return 'chrome';
+        }
+    }
+
+    _getModifierInfo(browser, os) {
+        let osKeys;
+        let separator;
+        switch (os) {
+            case 'win':
+                separator = ' + ';
+                osKeys = [
+                    ['alt', 'Alt'],
+                    ['ctrl', 'Ctrl'],
+                    ['shift', 'Shift'],
+                    ['meta', 'Windows']
+                ];
+                break;
+            case 'mac':
+                separator = '';
+                osKeys = [
+                    ['alt', '⌥'],
+                    ['ctrl', '⌃'],
+                    ['shift', '⇧'],
+                    ['meta', '⌘']
+                ];
+                break;
+            case 'linux':
+            case 'openbsd':
+            case 'cros':
+            case 'android':
+                separator = ' + ';
+                osKeys = [
+                    ['alt', 'Alt'],
+                    ['ctrl', 'Ctrl'],
+                    ['shift', 'Shift'],
+                    ['meta', 'Super']
+                ];
+                break;
+            default:
+                throw new Error(`Invalid OS: ${os}`);
+        }
+
+        const isFirefox = (browser === 'firefox' || browser === 'firefox-mobile');
+        const keys = [];
+
+        for (const [value, name] of osKeys) {
+            // Firefox doesn't support event.metaKey on platforms other than macOS
+            if (value === 'meta' && isFirefox && os !== 'mac') { continue; }
+            keys.push({value, name});
+        }
+
+        return {keys, separator};
+    }
+}