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"use strict";
/**
* @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.
*/
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var ts = require("typescript");
var Lint = require("../index");
var Rule = (function (_super) {
tslib_1.__extends(Rule, _super);
function Rule() {
return _super !== null && _super.apply(this, arguments) || this;
}
Rule.prototype.applyWithProgram = function (sourceFile, program) {
return this.applyWithWalker(new Walker(sourceFile, this.ruleName, program.getTypeChecker()));
};
return Rule;
}(Lint.Rules.TypedRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
ruleName: "no-unnecessary-type-assertion",
description: "Warns if a type assertion does not change the type of an expression.",
options: null,
optionsDescription: "Not configurable",
type: "typescript",
hasFix: true,
typescriptOnly: true,
requiresTypeInfo: true,
};
/* tslint:enable:object-literal-sort-keys */
Rule.FAILURE_STRING = "This assertion is unnecessary since it does not change the type of the expression.";
exports.Rule = Rule;
var Walker = (function (_super) {
tslib_1.__extends(Walker, _super);
function Walker(sourceFile, ruleName, checker) {
var _this = _super.call(this, sourceFile, ruleName, undefined) || this;
_this.checker = checker;
return _this;
}
Walker.prototype.walk = function (sourceFile) {
var _this = this;
var cb = function (node) {
switch (node.kind) {
case ts.SyntaxKind.TypeAssertionExpression:
case ts.SyntaxKind.NonNullExpression:
case ts.SyntaxKind.AsExpression:
_this.verifyCast(node);
}
return ts.forEachChild(node, cb);
};
return ts.forEachChild(sourceFile, cb);
};
Walker.prototype.verifyCast = function (node) {
var castType = this.checker.getTypeAtLocation(node);
if (castType === undefined) {
return;
}
var uncastType = this.checker.getTypeAtLocation(node.expression);
if (uncastType === castType) {
this.addFailureAtNode(node, Rule.FAILURE_STRING, node.kind === ts.SyntaxKind.TypeAssertionExpression
? Lint.Replacement.deleteFromTo(node.getStart(), node.expression.getStart())
: Lint.Replacement.deleteFromTo(node.expression.getEnd(), node.getEnd()));
}
};
return Walker;
}(Lint.AbstractWalker));
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