"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 utils_1 = require("../language/utils");
var OPTION_IGNORE_ARROW_FUNCTION_SHORTHAND = "ignore-arrow-function-shorthand";
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) {
        var ignoreArrowFunctionShorthand = this.ruleArguments.indexOf(OPTION_IGNORE_ARROW_FUNCTION_SHORTHAND) !== -1;
        return this.applyWithFunction(sourceFile, function (ctx) { return walk(ctx, program.getTypeChecker()); }, { ignoreArrowFunctionShorthand: ignoreArrowFunctionShorthand });
    };
    return Rule;
}(Lint.Rules.TypedRule));
/* tslint:disable:object-literal-sort-keys */
Rule.metadata = {
    ruleName: "no-void-expression",
    description: "Requires expressions of type `void` to appear in statement position.",
    optionsDescription: (_a = ["\n            If `", "` is provided, `() => returnsVoid()` will be allowed.\n            Otherwise, it must be written as `() => { returnsVoid(); }`."], _a.raw = ["\n            If \\`", "\\` is provided, \\`() => returnsVoid()\\` will be allowed.\n            Otherwise, it must be written as \\`() => { returnsVoid(); }\\`."], Lint.Utils.dedent(_a, OPTION_IGNORE_ARROW_FUNCTION_SHORTHAND)),
    options: {
        type: "array",
        items: {
            type: "string",
            enum: [OPTION_IGNORE_ARROW_FUNCTION_SHORTHAND],
        },
        minLength: 0,
        maxLength: 1,
    },
    requiresTypeInfo: true,
    type: "functionality",
    typescriptOnly: false,
};
/* tslint:enable:object-literal-sort-keys */
Rule.FAILURE_STRING = "Expression has type `void`. Put it on its own line as a statement.";
exports.Rule = Rule;
function walk(ctx, checker) {
    var sourceFile = ctx.sourceFile, ignoreArrowFunctionShorthand = ctx.options.ignoreArrowFunctionShorthand;
    return ts.forEachChild(sourceFile, function cb(node) {
        if (isPossiblyVoidExpression(node)
            && !isParentAllowedVoid(node)
            && utils_1.isTypeFlagSet(checker.getTypeAtLocation(node), ts.TypeFlags.Void)) {
            ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
        }
        return ts.forEachChild(node, cb);
    });
    function isParentAllowedVoid(node) {
        switch (node.parent.kind) {
            case ts.SyntaxKind.ExpressionStatement:
                return true;
            case ts.SyntaxKind.ArrowFunction:
                return ignoreArrowFunctionShorthand;
            default:
                return false;
        }
    }
}
function isPossiblyVoidExpression(node) {
    switch (node.kind) {
        case ts.SyntaxKind.AwaitExpression:
        case ts.SyntaxKind.CallExpression:
        case ts.SyntaxKind.TaggedTemplateExpression:
            return true;
        default:
            return false;
    }
}
var _a;