Added new rule: jsx-prop-sorting-rule

Fixes #8

Author: David Lipowicz

src/rules/jsxPropSortingRule.ts

@@ -0,0 +1,47 @@
+/**
+ * @license
+ * Copyright 2016 Palantir Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as ts from "typescript";
+import * as Lint from "tslint/lib/lint";
+
+export class Rule extends Lint.Rules.AbstractRule {
+    public static FAILURE_STRING = "Prop names are not alphabetized";
+
+    public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+        const walker = new JsxPropSortingWalker(sourceFile, this.getOptions());
+        return this.applyWithWalker(walker);
+    }
+}
+
+class JsxPropSortingWalker extends Lint.RuleWalker {
+    protected visitInterfaceDeclaration(node: ts.InterfaceDeclaration) {
+        let prevChildName = "";
+        let currChildName = "";
+        ts.forEachChild(node, child => {
+            if (child.kind === ts.SyntaxKind.PropertySignature) {
+                currChildName = child.getText();
+                if (currChildName.localeCompare(prevChildName) > 0) {
+                    prevChildName = currChildName;
+                } else {
+                    this.addFailure(this.createFailure(child.getStart(), child.getWidth(), Rule.FAILURE_STRING));
+                }
+            }
+        });
+
+        super.visitInterfaceDeclaration(node);
+    }
+}

test/rules/jsx-prop-sorting/test.tsx.lint

@@ -0,0 +1,31 @@
+export interface Props {
+    /**
+     * With comment.
+     */
+    aProp?: boolean;
+
+    /**
+     * Another comment.
+     */
+    propTwo?: boolean;
+}
+
+export interface Props {
+    aProp?: boolean;
+    propTwo: boolean;
+    thirdProp?: string;
+}
+
+export interface Props {
+    propTwo?: boolean;
+    aProp?: boolean;
+    ~~~~~~~~~~~~~~~~ [Prop names are not alphabetized]
+}
+
+export interface Props {
+    propTwo?: boolean;
+    tProp: string;
+    aProp?: boolean;
+    ~~~~~~~~~~~~~~~~ [Prop names are not alphabetized]
+    zProp: number;
+}

test/rules/jsx-prop-sorting/tslint.json

@@ -0,0 +1,5 @@
+{
+    "rules": {
+        "jsx-prop-sorting": true
+    }
+}