Merge pull request +15889 from c9/ide-eslint

fix support for experimental js syntax

plugins/c9.fs/mock/test_es6.js

@@ -50,7 +50,9 @@ q;
 
 class Blie {}
 
+@exported
 class Model extends Blie {
+  x = 1
   constructor(properties) {
     this.properties = properties;
   }
@@ -58,6 +60,12 @@ class Model extends Blie {
   toObject() {
     return this.properties;
   }
+  
+  @exported(1)
+  async f() {
+      this::exported();
+      ::myFun;
+  }
 }
 
 new Model();

plugins/c9.ide.language.javascript.eslint/packager/.gitignore

@@ -0,0 +1,2 @@
+acorn
+node_modules

plugins/c9.ide.language.javascript.eslint/packager/setup.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -euo pipefail
+
+cd `dirname $0`
+npm i
+if ! [ -d acorn/.git ]; then
+    git clone https://github.com/c9/acorn
+fi
+pushd acorn
+git fetch origin
+git reset origin/master --hard
+npm i
+npm run build
+popd
+
+cp acorn/dist/* node_modules/acorn/dist
+
+node eslint.js

plugins/c9.ide.language.javascript.eslint/worker/eslint_worker.js

@@ -203,8 +203,15 @@ handler.analyzeSync = function(value, ast, path) {
         if (isJson && level !== "error")
             return;
 
-        if (m.message.match(/'([^']*)' is defined but never used/)) {
-            var target = RegExp.$1;
+        // convert to 0 based offsets
+        m.column--;
+        m.line--;
+        m.endLine--;
+        m.endColumn--;
+        
+        if (m.message.match(/but never used/)) {
+            var line = doc.getLine(m.line);
+            var target = line.slice(m.column, m.endColumn)
             if (target.toUpperCase() === target && target.toLowerCase() !== target)
                 return; // ignore unused constants
             if (target === "h")
@@ -215,12 +222,8 @@ handler.analyzeSync = function(value, ast, path) {
         if (m.ruleId && m.ruleId.match(/space|spacing/) && m.severity === 1)
             level = "info";
         
-        // work around column offset bug
-        m.column--;
-        m.line--;
-
         var ec;
-        if (m.message.match(/is not defined|was used before it was defined|is already declared|is already defined|unexpected identifier|defined but never used/i)) {
+        if (m.message.match(/is not defined|was used before it was defined|is already declared|is already defined|unexpected identifier|but never used/i)) {
             var line = doc.getLine(m.line);
             var id = workerUtil.getFollowingIdentifier(line, m.column);
             if (m.message.match(/is already defined/) && line.match("for \\(var " + id))