// @module: commonjs

// @includebuiltfile: typescript_standalone.d.ts

// @noImplicitAny:true

// @strictNullChecks:true

/*

* Note: This test is a public API sample. The sample sources can be found

at: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#traversing-the-ast-with-a-little-linter

* Please log a "breaking change" issue for any API breaking change affecting this issue

*/

declare var process: any;

declare var console: any;

declare var readFileSync: any;

import * as ts from "typescript";

export function delint(sourceFile: ts.SourceFile) {

delintNode(sourceFile);

function delintNode(node: ts.Node) {

switch (node.kind) {

case ts.SyntaxKind.ForStatement:

case ts.SyntaxKind.ForInStatement:

case ts.SyntaxKind.WhileStatement:

case ts.SyntaxKind.DoStatement:

if ((<ts.IterationStatement>node).statement.kind !== ts.SyntaxKind.Block) {

report(node, "A looping statement's contents should be wrapped in a block body.");

}

break;

case ts.SyntaxKind.IfStatement:

let ifStatement = (<ts.IfStatement>node);

if (ifStatement.thenStatement.kind !== ts.SyntaxKind.Block) {

report(ifStatement.thenStatement, "An if statement's contents should be wrapped in a block body.");

}

if (ifStatement.elseStatement &&

ifStatement.elseStatement.kind !== ts.SyntaxKind.Block &&

ifStatement.elseStatement.kind !== ts.SyntaxKind.IfStatement) {

report(ifStatement.elseStatement, "An else statement's contents should be wrapped in a block body.");

}

break;

case ts.SyntaxKind.BinaryExpression:

let op = (<ts.BinaryExpression>node).operatorToken.kind;

if (op === ts.SyntaxKind.EqualsEqualsToken || op == ts.SyntaxKind.ExclamationEqualsToken) {

report(node, "Use '===' and '!=='.")

}

break;

}

ts.forEachChild(node, delintNode);

}

function report(node: ts.Node, message: string) {

let { line, character } = sourceFile.getLineAndCharacterOfPosition(node.getStart());

console.log(`${sourceFile.fileName} (${line + 1},${character + 1}): ${message}`);

}

}

const fileNames: string[] = process.argv.slice(2);

fileNames.forEach(fileName => {

// Parse a file

let sourceFile = ts.createSourceFile(fileName, readFileSync(fileName).toString(), ts.ScriptTarget.ES2015, /*setParentNodes */ true);

// delint it

delint(sourceFile);

});