refactor CSSLint

* reduce linting delay
* parse mozformat in worker
* allow empty functions in 'filter:' property
  https://drafts.fxtf.org/filter-effects/#supported-filter-functions
* support comma-separated list in :lang()
* strip vendor prefix in isLiteral()

.eslintignore

@@ -1,3 +1,4 @@
 vendor/
 vendor-overwrites/*
 !vendor-overwrites/colorpicker
+!vendor-overwrites/csslint

.eslintrc

@@ -239,13 +239,13 @@ rules:
   object-curly-spacing: [2, never]
   object-shorthand: [0]
   one-var-declaration-per-line: [1]
-  one-var: [0]
+  one-var: [2, {initialized: never}]
   operator-assignment: [2, always]
   operator-linebreak: [2, after, overrides: {"?": ignore, ":": ignore, "&&": ignore, "||": ignore}]
   padded-blocks: [0]
   prefer-numeric-literals: [2]
   prefer-rest-params: [0]
-  prefer-const: [1, {destructuring: any, ignoreReadBeforeAssign: true}]
+  prefer-const: [1, {destructuring: all, ignoreReadBeforeAssign: true}]
   quote-props: [0]
   quotes: [1, single, avoid-escape]
   radix: [2, as-needed]

edit.html

@@ -5,6 +5,7 @@
 
     <link href="global.css" rel="stylesheet">
     <link href="edit/edit.css" rel="stylesheet">
+    <link rel="stylesheet" href="msgbox/msgbox.css">
 
     <style id="firefox-transitions-bug-suppressor">
       /* restrict to FF */
@@ -22,7 +23,6 @@
     <script src="js/prefs.js"></script>
     <script src="js/localization.js"></script>
     <script src="js/script-loader.js"></script>
-    <script src="js/moz-parser.js"></script>
     <script src="js/storage-util.js"></script>
     <script src="content/apply.js"></script>
     <script src="edit/lint.js"></script>
@@ -37,6 +37,8 @@
     <script src="edit/codemirror-editing-hooks.js"></script>
     <script src="edit/edit.js"></script>
 
+    <script src="msgbox/msgbox.js" async></script>
+
     <link  href="vendor/codemirror/lib/codemirror.css" rel="stylesheet">
     <script src="vendor/codemirror/lib/codemirror.js"></script>
 

edit/edit.js

@@ -1,11 +1,12 @@
 /*
 global CodeMirror parserlib loadScript
 global CSSLint initLint linterConfig updateLintReport renderLintReport updateLinter
-global mozParser createSourceEditor
+global createSourceEditor
 global closeCurrentTab regExpTester messageBox
 global setupCodeMirror
 global beautify
 global initWithSectionStyle addSections removeSection getSectionsHashes
+global sectionsToMozFormat
 */
 'use strict';
 
@@ -415,7 +416,7 @@ function showMozillaFormat() {
 }
 
 function toMozillaFormat() {
-  return mozParser.format({sections: getSectionsHashes()});
+  return sectionsToMozFormat({sections: getSectionsHashes()});
 }
 
 function fromMozillaFormat() {
@@ -450,8 +451,24 @@ function fromMozillaFormat() {
   function doImport({replaceOldStyle = false}) {
     lockPageUI(true);
     new Promise(setTimeout)
-      .then(() => mozParser.parse(popup.codebox.getValue().trim()))
-      .then(sections => {
+      .then(() => {
+        const worker = linterConfig.worker.csslint;
+        if (!worker.instance) worker.instance = new Worker(worker.path);
+      })
+      .then(() => linterConfig.invokeWorker({
+        linter: 'csslint',
+        action: 'parse',
+        code: popup.codebox.getValue().trim(),
+      }))
+      .then(({sections, errors}) => {
+        // shouldn't happen but just in case
+        if (!sections.length && errors.length) {
+          return Promise.reject(errors);
+        }
+        // show the errors in case linting is disabled or stylelint misses what csslint has found
+        if (errors.length && prefs.get('editor.linter') !== 'csslint') {
+          showError(errors);
+        }
         removeOldSections(replaceOldStyle);
         return addSections(sections, div => setCleanItem(div, false));
       })

edit/lint.js

@@ -20,7 +20,7 @@ var linterConfig = {
     stylelint: 'editorStylelintConfig',
   },
   worker: {
-    csslint: {path: '/vendor-overwrites/csslint/csslint-worker.js'},
+    csslint: {path: '/vendor-overwrites/csslint/csslint-loader.js'},
     stylelint: {path: '/vendor-overwrites/stylelint/stylelint-bundle.min.js'},
   },
   allRuleIds: {
@@ -48,7 +48,7 @@ var linterConfig = {
       },
       onUpdateLinting(annotationsNotSorted, annotations, cm) {
         cm.endOperation();
-        updateLintReport(cm, 0);
+        updateLintReport(cm);
       },
     } : false;
   },
@@ -561,15 +561,17 @@ function setupLinterPopup(config) {
 
 function loadLinterAssets(name = linterConfig.getName()) {
   const worker = linterConfig.worker[name];
-  return !name || !worker || worker.instance ? Promise.resolve() :
-    loadScript((worker.instance ? [] : [
-      (worker.instance = new Worker(worker.path)),
-      `/edit/lint-defaults-${name}.js`,
-    ]).concat(CodeMirror.lint ? [] : [
-      '/vendor/codemirror/addon/lint/lint.css',
-      '/msgbox/msgbox.css',
-      '/vendor/codemirror/addon/lint/lint.js',
-      '/edit/lint-codemirror-helper.js',
-      '/msgbox/msgbox.js'
-    ]));
+  if (!name || !worker) return Promise.resolve();
+  const scripts = [];
+  if (!worker.instance) {
+    worker.instance = new Worker(worker.path);
+    scripts.push(`/edit/lint-defaults-${name}.js`);
+  }
+  if (!CodeMirror.lint) {
+    scripts.push(
+      '/vendor/codemirror/addon/lint/lint.css',
+      '/vendor/codemirror/addon/lint/lint.js',
+      '/edit/lint-codemirror-helper.js');
+  }
+  return scripts.length ? loadScript(scripts) : Promise.resolve();
 }

edit/source-editor.js

@@ -1,6 +1,6 @@
 /* global CodeMirror dirtyReporter initLint */
 /* global showToggleStyleHelp goBackToManage updateLintReportIfEnabled */
-/* global editors linterConfig updateLinter regExpTester mozParser */
+/* global editors linterConfig updateLinter regExpTester sectionsToMozFormat */
 /* global createAppliesToLineWidget messageBox */
 'use strict';
 
@@ -100,10 +100,10 @@ function createSourceEditor(style) {
 
   function setupNewStyle(style) {
     style.sections[0].code = ' '.repeat(prefs.get('editor.tabSize')) + '/* Insert code here... */';
-    let section = mozParser.format(style);
+    let section = sectionsToMozFormat(style);
     if (!section.includes('@-moz-document')) {
       style.sections[0].domains = ['example.com'];
-      section = mozParser.format(style);
+      section = sectionsToMozFormat(style);
     }
     const DEFAULT_CODE = `
       /* ==UserStyle==

edit/util.js

@@ -93,3 +93,26 @@ function dirtyReporter() {
 
   return wrap({add, remove, modify, clear, isDirty, onChange, has});
 }
+
+
+function sectionsToMozFormat(style) {
+  const propertyToCss = {
+    urls:        'url',
+    urlPrefixes: 'url-prefix',
+    domains:     'domain',
+    regexps:     'regexp',
+  };
+  return style.sections.map(section => {
+    let cssMds = [];
+    for (const i in propertyToCss) {
+      if (section[i]) {
+        cssMds = cssMds.concat(section[i].map(v =>
+          propertyToCss[i] + '("' + v.replace(/\\/g, '\\\\') + '")'
+        ));
+      }
+    }
+    return cssMds.length ?
+      '@-moz-document ' + cssMds.join(', ') + ' {\n' + section.code + '\n}' :
+      section.code;
+  }).join('\n\n');
+}

js/moz-parser.js

@@ -1,28 +1,30 @@
-/* global parserlib, loadScript */
+/* global parserlib */
 'use strict';
 
-// eslint-disable-next-line no-var
-var mozParser = (() => {
-  // direct & reverse mapping of @-moz-document keywords and internal property names
-  const propertyToCss = {urls: 'url', urlPrefixes: 'url-prefix', domains: 'domain', regexps: 'regexp'};
-  const CssToProperty = {'url': 'urls', 'url-prefix': 'urlPrefixes', 'domain': 'domains', 'regexp': 'regexps'};
-
 function parseMozFormat(mozStyle) {
-    return new Promise((resolve, reject) => {
+  const CssToProperty = {
+    'url':        'urls',
+    'url-prefix': 'urlPrefixes',
+    'domain':     'domains',
+    'regexp':     'regexps',
+  };
   const parser = new parserlib.css.Parser();
-      const lines = mozStyle.split('\n');
-      const sectionStack = [{code: '', start: {line: 1, col: 1}}];
+  const sectionStack = [{code: '', start: 0}];
   const errors = [];
   const sections = [];
 
   parser.addListener('startdocument', e => {
     const lastSection = sectionStack[sectionStack.length - 1];
-        let outerText = getRange(lastSection.start, {line: e.line, col: e.col - 1});
+    let outerText = mozStyle.slice(lastSection.start, e.offset);
     const lastCmt = getLastComment(outerText);
-        const {endLine: line, endCol: col} = parser._tokenStream._token;
-        const section = {code: '', start: {line, col}};
+    const section = {
+      code: '',
+      start: parser._tokenStream._token.offset + 1,
+    };
     // move last comment before @-moz-document inside the section
-        if (!/\/\*[\s\n]*AGENT_SHEET[\s\n]*\*\//.test(lastCmt)) {
+    if (!lastCmt.includes('AGENT_SHEET') &&
+        !lastCmt.includes('==') &&
+        !/==userstyle==/iu.test(lastCmt)) {
       if (lastCmt) {
         section.code = lastCmt + '\n';
         outerText = outerText.slice(0, -lastCmt.length);
@@ -34,15 +36,9 @@ var mozParser = (() => {
       doAddSection(lastSection);
       lastSection.code = '';
     }
-        for (const f of e.functions) {
-          const m = f && f.match(/^([\w-]*)\((.+?)\)$/);
-          if (!m || !/^(url|url-prefix|domain|regexp)$/.test(m[1])) {
-            errors.push(`${e.line}:${e.col + 1} invalid function "${m ? m[1] : f || ''}"`);
-            continue;
-          }
-          const aType = CssToProperty[m[1]];
-          const aValue = unquote(aType !== 'regexps' ? m[2] : m[2].replace(/\\\\/g, '\\'));
-          (section[aType] = section[aType] || []).push(aValue);
+    for (const {name, expr, uri} of e.functions) {
+      const aType = CssToProperty[name.toLowerCase()];
+      (section[aType] = section[aType] || []).push(uri || expr && expr.parts[0].value || '');
     }
     sectionStack.push(section);
   });
@@ -50,48 +46,24 @@ var mozParser = (() => {
   parser.addListener('enddocument', e => {
     const section = sectionStack.pop();
     const lastSection = sectionStack[sectionStack.length - 1];
-        const end = {line: e.line, col: e.col - 1};
-        section.code += getRange(section.start, end);
-        end.col += 2;
-        lastSection.start = end;
+    section.code += mozStyle.slice(section.start, e.offset);
+    lastSection.start = e.offset + 1;
     doAddSection(section);
   });
 
   parser.addListener('endstylesheet', () => {
     // add nonclosed outer sections (either broken or the last global one)
-        const lastLine = lines[lines.length - 1];
-        const endOfText = {line: lines.length, col: lastLine.length + 1};
     const lastSection = sectionStack[sectionStack.length - 1];
-        lastSection.code += getRange(lastSection.start, endOfText);
+    lastSection.code += mozStyle.slice(lastSection.start);
     sectionStack.forEach(doAddSection);
-
-        if (errors.length) {
-          reject(errors);
-        } else {
-          resolve(sections);
-        }
   });
 
   parser.addListener('error', e => {
-        errors.push(e.line + ':' + e.col + ' ' +
-          e.message.replace(/ at line \d.+$/, ''));
+    errors.push(`${e.line}:${e.col} ${e.message.replace(/ at line \d.+$/, '')}`);
   });
 
   parser.parse(mozStyle);
-
-      function getRange(start, end) {
-        const L1 = start.line - 1;
-        const C1 = start.col - 1;
-        const L2 = end.line - 1;
-        const C2 = end.col - 1;
-        if (L1 === L2) {
-          return lines[L1].substr(C1, C2 - C1 + 1);
-        } else {
-          const middle = lines.slice(L1 + 1, L2).join('\n');
-          return lines[L1].substr(C1) + '\n' + middle +
-            (L2 >= lines.length ? '' : ((middle ? '\n' : '') + lines[L2].substring(0, C2)));
-        }
-      }
+  return {sections, errors};
 
   function doAddSection(section) {
     section.code = section.code.trim();
@@ -112,11 +84,6 @@ var mozParser = (() => {
     sections.push(Object.assign({}, section));
   }
 
-      function unquote(s) {
-        const first = s.charAt(0);
-        return (first === '"' || first === "'") && s.endsWith(first) ? s.slice(1, -1) : s;
-      }
-
   function getLastComment(text) {
     let open = text.length;
     let close;
@@ -132,34 +99,11 @@ var mozParser = (() => {
         break;
       }
       // find a closed preceding comment
-          const prevClose = text.lastIndexOf('*/', close);
+      const prevClose = text.lastIndexOf('*/', close - 2);
       // then find the real start of current comment
       // e.g. /* preceding */  /* current /* current /* current */
       open = text.indexOf('/*', prevClose < 0 ? 0 : prevClose + 2);
     }
-        return text.substr(open);
-      }
-    });
-  }
-
-  return {
-    // Parse mozilla-format userstyle into sections
-    parse(text) {
-      return Promise.resolve(self.CSSLint || loadScript('/vendor-overwrites/csslint/csslint-worker.js'))
-        .then(() => parseMozFormat(text));
-    },
-    format(style) {
-      return style.sections.map(section => {
-        let cssMds = [];
-        for (const i in propertyToCss) {
-          if (section[i]) {
-            cssMds = cssMds.concat(section[i].map(v =>
-              propertyToCss[i] + '("' + v.replace(/\\/g, '\\\\') + '")'
-            ));
+    return open ? text.slice(open) : text;
   }
 }
-        return cssMds.length ? '@-moz-document ' + cssMds.join(', ') + ' {\n' + section.code + '\n}' : section.code;
-      }).join('\n\n');
-    }
-  };
-})();

js/prefs.js

@@ -57,9 +57,9 @@ var prefs = new function Prefs() {
       end_with_newline: false,
       indent_conditional: true,
     },
-    'editor.lintDelay': 500,        // lint gutter marker update delay, ms
+    'editor.lintDelay': 300,        // lint gutter marker update delay, ms
     'editor.linter': 'csslint',     // 'csslint' or 'stylelint' or ''
-    'editor.lintReportDelay': 4500, // lint report update delay, ms
+    'editor.lintReportDelay': 500,  // lint report update delay, ms
     'editor.matchHighlight': 'token', // token = token/word under cursor even if nothing is selected
                                       // selection = only when something is selected
                                       // '' (empty string) = disabled
@@ -234,6 +234,7 @@ var prefs = new function Prefs() {
     // Unlike chrome.storage or messaging, HTML5 localStorage is synchronous and always ready,
     // so we'll mirror the prefs to avoid using the wrong defaults during the startup phase
     const importFromLocalStorage = () => {
+      forgetOutdatedDefaults(localStorage);
       for (const key in defaults) {
         const defaultValue = defaults[key];
         let value = localStorage[key];
@@ -323,6 +324,7 @@ var prefs = new function Prefs() {
   }
 
   function importFromSync(synced = {}) {
+    forgetOutdatedDefaults(synced);
     for (const key in defaults) {
       if (key in synced) {
         this.set(key, synced[key], {sync: false});
@@ -330,6 +332,12 @@ var prefs = new function Prefs() {
     }
   }
 
+  function forgetOutdatedDefaults(storage) {
+    // our linter runs as a worker so we can reduce the delay and forget the old default values
+    if (Number(storage['editor.lintDelay']) === 500) delete storage['editor.lintDelay'];
+    if (Number(storage['editor.lintReportDelay']) === 4500) delete storage['editor.lintReportDelay'];
+  }
+
   function defineReadonlyProperty(obj, key, value) {
     const copy = deepCopy(value);
     if (typeof copy === 'object') {

js/usercss.js

@@ -1,4 +1,4 @@
-/* global loadScript mozParser semverCompare colorConverter styleCodeEmpty */
+/* global loadScript semverCompare colorConverter styleCodeEmpty */
 'use strict';
 
 // eslint-disable-next-line no-var
@@ -485,11 +485,17 @@ var usercss = (() => {
 
     const sVars = simpleVars(vars);
 
-    return Promise.resolve(builder.preprocess && builder.preprocess(sourceCode, sVars) || sourceCode)
+    return (
+      Promise.resolve(
+        builder.preprocess && builder.preprocess(sourceCode, sVars) ||
+        sourceCode)
       .then(mozStyle => invokeWorker({action: 'parse', code: mozStyle}))
-      .then(sections => (style.sections = sections))
-      .then(() => builder.postprocess && builder.postprocess(style.sections, sVars))
-      .then(() => style);
+      .then(({sections, errors}) => sections.length && sections || Promise.reject(errors))
+      .then(sections => {
+        style.sections = sections;
+        if (builder.postprocess) builder.postprocess(style.sections, sVars);
+        return style;
+      }));
   }
 
   function simpleVars(vars) {
@@ -568,7 +574,7 @@ var usercss = (() => {
 
   function invokeWorker(message) {
     if (!worker.queue) {
-      worker.instance = new Worker('/vendor-overwrites/csslint/csslint-worker.js');
+      worker.instance = new Worker('/vendor-overwrites/csslint/csslint-loader.js');
       worker.queue = [];
       worker.instance.onmessage = ({data}) => {
         worker.queue.shift().resolve(data.__ERROR__ ? Promise.reject(data.__ERROR__) : data);

vendor-overwrites/csslint/csslint-loader.js

@@ -0,0 +1,35 @@
+/* global parserlib CSSLint parseMozFormat */
+'use strict';
+
+self.importScripts('./parserlib.js');
+parserlib.css.Tokens[parserlib.css.Tokens.COMMENT].hide = false;
+
+self.onmessage = ({data: {action = 'run', code, config}}) => {
+
+  if (action === 'parse') {
+    if (!self.parseMozFormat) self.importScripts('/js/moz-parser.js');
+    self.postMessage(parseMozFormat(code));
+    return;
+  }
+  if (!self.CSSLint) self.importScripts('./csslint.js');
+
+  switch (action) {
+    case 'getAllRuleIds':
+      // the functions are non-tranferable and we need only an id
+      self.postMessage(CSSLint.getRules().map(rule => rule.id));
+      return;
+
+    case 'getAllRuleInfos':
+      // the functions are non-tranferable
+      self.postMessage(CSSLint.getRules().map(rule => JSON.parse(JSON.stringify(rule))));
+      return;
+
+    case 'run': {
+      const results = CSSLint.verify(code, config).messages
+        //.filter(m => !m.message.includes('/*[[') && !m.message.includes(']]*/'))
+        .map(m => Object.assign(m, {rule: {id: m.rule.id}}));
+      self.postMessage(results);
+      return;
+    }
+  }
+};