feat(ESLint): ESLintのシンプルな実装を追加

Author: azu

package.json

@@ -34,6 +34,8 @@
     "eslint": "^1.3.0",
     "eslint-plugin-markdown": "git://github.com/eslint/eslint-plugin-markdown.git",
     "espower-babel": "^3.3.0",
+    "esprima": "^2.5.0",
+    "estraverse": "^4.1.0",
     "gitbook-cli": "^0.3.4",
     "gitbook-plugin-richquotes": "0.0.5",
     "gitbook-summary-to-path": "^1.0.1",

src/ESLint/MyLint.js

@@ -0,0 +1,41 @@
+// LICENSE : MIT
+"use strict";
+import {parse} from "esprima";
+import {traverse} from "estraverse";
+import {EventEmitter} from "events";
+class RuleContext extends EventEmitter {
+    report(node, message) {
+        this.emit("report", message);
+    }
+}
+export default class MyLint extends EventEmitter {
+    constructor() {
+        super();
+        this._emitter = new EventEmitter();
+        this._ruleContext = new RuleContext();
+        this._ruleContext.on("report", (message) => {
+            this.emit("report", message);
+        });
+    }
+
+    loadPlugin(plugin) {
+        var rule = plugin(this._ruleContext);
+        // on(nodeType, nodeTypeCallback);
+        Object.keys(rule).forEach(nodeType => {
+            this._emitter.on(nodeType, rule[nodeType]);
+        });
+    }
+
+
+    lint(code) {
+        var ast = parse(code);
+        traverse(ast, {
+            enter: (node) => {
+                this._emitter.emit(node.type, node);
+            },
+            leave: (node) => {
+                this._emitter.emit(`${node.type}:exit`, node);
+            }
+        });
+    }
+}

src/ESLint/no-console.js

@@ -0,0 +1,10 @@
+"use strict";
+module.exports = function (context) {
+    return {
+        "MemberExpression": function (node) {
+            if (node.object.name === "console") {
+                context.report(node, "Unexpected console statement.");
+            }
+        }
+    };
+};

test/ESLint/MyLint-test.js

@@ -0,0 +1,15 @@
+// LICENSE : MIT
+"use strict";
+import assert from "power-assert";
+import MyLint from "../../src/ESLint/MyLint";
+import noConsole from "../../src/ESLint/no-console";
+describe("MyLint", function () {
+    it("should load and lint", function () {
+        let lint = new MyLint();
+        lint.loadPlugin(noConsole);
+        lint.on("report", (message)=> {
+            assert.equal(message, "Unexpected console statement.");
+        });
+        lint.lint(`console.log("test")`);
+    });
+});