Add tslint rules for #3994

Jakefile.js

@@ -770,17 +770,34 @@ task("update-sublime", ["local", serverFile], function() {
     jake.cpR(serverFile + ".map", "../TypeScript-Sublime-Plugin/tsserver/");
 });
 
+var tslintRuleDir = "scripts/tslint";
+var tslintRules = ([
+    "nextLineRule",
+    "noInferrableTypesRule"
+]);
+var tslintRulesFiles = tslintRules.map(function(p) {
+    return path.join(tslintRuleDir, p + ".ts");
+});
+var tslintRulesOutFiles = tslintRules.map(function(p) {
+    return path.join(builtLocalDirectory, "tslint", p + ".js");
+});
+desc("Compiles tslint rules to js");
+task("build-rules", tslintRulesOutFiles);
+tslintRulesFiles.forEach(function(ruleFile, i) {
+    compileFile(tslintRulesOutFiles[i], [ruleFile], [ruleFile], [], /*useBuiltCompiler*/ true, /*noOutFile*/ true, /*generateDeclarations*/ false, path.join(builtLocalDirectory, "tslint")); 
+});
+
 // if the codebase were free of linter errors we could make jake runtests
 // run this task automatically
 desc("Runs tslint on the compiler sources");
-task("lint", [], function() {
+task("lint", ["build-rules"], function() {
     function success(f) { return function() { console.log('SUCCESS: No linter errors in ' + f + '\n'); }};
     function failure(f) { return function() { console.log('FAILURE: Please fix linting errors in ' + f + '\n') }};
 
     var lintTargets = compilerSources.concat(harnessCoreSources);
     for (var i in lintTargets) {
         var f = lintTargets[i];
-        var cmd = 'tslint -c tslint.json ' + f;
+        var cmd = 'tslint --rules-dir built/local/tslint -c tslint.json ' + f;
         exec(cmd, success(f), failure(f));
     }
 }, { async: true });

scripts/tslint/nextLineRule.ts

@@ -0,0 +1,63 @@
+/// <reference path="../../lib/typescriptServices.d.ts" />
+/// <reference path="../../node_modules/tslint/lib/tslint.d.ts" />
+
+const OPTION_CATCH = "check-catch";
+const OPTION_ELSE = "check-else";
+
+export class Rule extends Lint.Rules.AbstractRule {
+    public static CATCH_FAILURE_STRING = "'catch' should be on the line following the previous block's ending curly brace";
+    public static ELSE_FAILURE_STRING = "'else' should be on the line following the previous block's ending curly brace";
+
+    public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+        return this.applyWithWalker(new NextLineWalker(sourceFile, this.getOptions()));
+    }
+}
+
+class NextLineWalker extends Lint.RuleWalker {
+    public visitIfStatement(node: ts.IfStatement) {
+        const sourceFile = node.getSourceFile();
+        const thenStatement = node.thenStatement;
+
+        const elseStatement = node.elseStatement;
+        if (!!elseStatement) {
+            // find the else keyword
+            const elseKeyword = getFirstChildOfKind(node, ts.SyntaxKind.ElseKeyword);
+            if (this.hasOption(OPTION_ELSE) && !!elseKeyword) {
+                const thenStatementEndLoc = sourceFile.getLineAndCharacterOfPosition(thenStatement.getEnd());
+                const elseKeywordLoc = sourceFile.getLineAndCharacterOfPosition(elseKeyword.getStart());
+                if (thenStatementEndLoc.line !== (elseKeywordLoc.line - 1)) {
+                    const failure = this.createFailure(elseKeyword.getStart(), elseKeyword.getWidth(), Rule.ELSE_FAILURE_STRING);
+                    this.addFailure(failure);
+                }
+            }
+        }
+
+        super.visitIfStatement(node);
+    }
+
+    public visitTryStatement(node: ts.TryStatement) {
+        const sourceFile = node.getSourceFile();
+        const catchClause = node.catchClause;
+
+        // "visit" try block
+        const tryKeyword = node.getChildAt(0);
+        const tryBlock = node.tryBlock;
+        const tryOpeningBrace = tryBlock.getChildAt(0);
+
+        if (this.hasOption(OPTION_CATCH) && !!catchClause) {
+            const tryClosingBrace = node.tryBlock.getChildAt(node.tryBlock.getChildCount() - 1);
+            const catchKeyword = catchClause.getChildAt(0);
+            const tryClosingBraceLoc = sourceFile.getLineAndCharacterOfPosition(tryClosingBrace.getEnd());
+            const catchKeywordLoc = sourceFile.getLineAndCharacterOfPosition(catchKeyword.getStart());
+            if (tryClosingBraceLoc.line !== (catchKeywordLoc.line - 1)) {
+                const failure = this.createFailure(catchKeyword.getStart(), catchKeyword.getWidth(), Rule.CATCH_FAILURE_STRING);
+                this.addFailure(failure);
+            }
+        }
+        super.visitTryStatement(node);
+    }
+}
+
+function getFirstChildOfKind(node: ts.Node, kind: ts.SyntaxKind) {
+    return node.getChildren().filter((child) => child.kind === kind)[0];
+}

scripts/tslint/noInferrableTypesRule.ts

@@ -0,0 +1,32 @@
+/// <reference path="../../lib/typescriptServices.d.ts" />
+/// <reference path="../../node_modules/tslint/lib/tslint.d.ts" />
+
+
+export class Rule extends Lint.Rules.AbstractRule {
+    public static FAILURE_STRING = "LHS type inferred by RHS expression, remove type annotation";
+
+    public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+        const program = ts.createProgram([sourceFile.fileName], Lint.createCompilerOptions());
+        return this.applyWithWalker(new InferrableTypeWalker(sourceFile, this.getOptions(), program));
+    }
+}
+
+class InferrableTypeWalker extends Lint.RuleWalker {
+    constructor(file: ts.SourceFile, opts: Lint.IOptions, private program: ts.Program) {
+        super(program.getSourceFile(file.fileName), opts);
+    }
+
+    visitVariableStatement(node: ts.VariableStatement) {
+        node.declarationList.declarations.forEach(e => {
+            if (
+                (!!e.type) &&
+                (!!e.initializer) &&
+                (this.program.getTypeChecker().getTypeAtLocation(e.type) === this.program.getTypeChecker().getContextualType(e.initializer))
+               ) {
+                this.addFailure(this.createFailure(e.type.getStart(), e.type.getWidth(), Rule.FAILURE_STRING));
+            }
+        });
+        
+        super.visitVariableStatement(node);
+    }
+}

scripts/tslint/tsconfig.json

@@ -0,0 +1,7 @@
+{
+	"compilerOptions": {
+		"noImplicitAny": true,
+		"module": "commonjs",
+		"outDir": "../../built/local/tslint"
+	}
+}

tslint.json

@@ -8,7 +8,8 @@
             "spaces"
         ],
         "one-line": [true,
-            "check-open-brace"
+            "check-open-brace",
+            "check-whitespace"
         ],
         "no-unreachable": true,
         "no-use-before-declare": true,
@@ -21,7 +22,8 @@
             "check-branch",
             "check-operator",
             "check-separator",
-            "check-type"
+            "check-type",
+            "check-module"
         ],
         "typedef-whitespace": [true, {
             "call-signature": "nospace",
@@ -29,6 +31,13 @@
             "parameter": "nospace",
             "property-declaration": "nospace",
             "variable-declaration": "nospace"
-        }]
+        }],
+        "next-line": [true, 
+            "check-catch",
+            "check-else"
+        ],
+        "no-internal-module": true,
+        "no-trailing-whitespace": true,
+        "no-inferrable-types": true
   }
 }