179 lines
8.3 KiB
JavaScript
179 lines
8.3 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2013 Palantir Technologies, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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var tslib_1 = require("tslib");
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// tslint:disable object-literal-sort-keys
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var ts = require("typescript");
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var Lint = require("../index");
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var utils_1 = require("../utils");
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var BANNED_KEYWORDS = ["any", "Number", "number", "String", "string", "Boolean", "boolean", "Undefined", "undefined"];
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var bannedKeywordsSet = new Set(BANNED_KEYWORDS);
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var bannedKeywordsStr = BANNED_KEYWORDS.map(function (kw) { return "`" + kw + "`"; }).join(", ");
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var OPTION_LEADING_UNDERSCORE = "allow-leading-underscore";
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var OPTION_TRAILING_UNDERSCORE = "allow-trailing-underscore";
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var OPTION_BAN_KEYWORDS = "ban-keywords";
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var OPTION_CHECK_FORMAT = "check-format";
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var OPTION_ALLOW_PASCAL_CASE = "allow-pascal-case";
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var OPTION_ALLOW_SNAKE_CASE = "allow-snake-case";
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var Rule = (function (_super) {
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tslib_1.__extends(Rule, _super);
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function Rule() {
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return _super !== null && _super.apply(this, arguments) || this;
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}
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Rule.prototype.apply = function (sourceFile) {
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return this.applyWithFunction(sourceFile, walk, parseOptions(this.ruleArguments));
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};
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return Rule;
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}(Lint.Rules.AbstractRule));
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Rule.metadata = {
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ruleName: "variable-name",
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description: "Checks variable names for various errors.",
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optionsDescription: (_a = ["\n Five arguments may be optionally provided:\n\n * `\"", "\"`: allows only lowerCamelCased or UPPER_CASED variable names\n * `\"", "\"` allows underscores at the beginning (only has an effect if \"check-format\" specified)\n * `\"", "\"` allows underscores at the end. (only has an effect if \"check-format\" specified)\n * `\"", "\"` allows PascalCase in addition to lowerCamelCase.\n * `\"", "\"` allows snake_case in addition to lowerCamelCase.\n * `\"", "\"`: disallows the use of certain TypeScript keywords as variable or parameter names.\n * These are: ", ""], _a.raw = ["\n Five arguments may be optionally provided:\n\n * \\`\"", "\"\\`: allows only lowerCamelCased or UPPER_CASED variable names\n * \\`\"", "\"\\` allows underscores at the beginning (only has an effect if \"check-format\" specified)\n * \\`\"", "\"\\` allows underscores at the end. (only has an effect if \"check-format\" specified)\n * \\`\"", "\"\\` allows PascalCase in addition to lowerCamelCase.\n * \\`\"", "\"\\` allows snake_case in addition to lowerCamelCase.\n * \\`\"", "\"\\`: disallows the use of certain TypeScript keywords as variable or parameter names.\n * These are: ", ""], Lint.Utils.dedent(_a, OPTION_CHECK_FORMAT, OPTION_LEADING_UNDERSCORE, OPTION_TRAILING_UNDERSCORE, OPTION_ALLOW_PASCAL_CASE, OPTION_ALLOW_SNAKE_CASE, OPTION_BAN_KEYWORDS, bannedKeywordsStr)),
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options: {
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type: "array",
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items: {
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type: "string",
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enum: [
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OPTION_CHECK_FORMAT,
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OPTION_LEADING_UNDERSCORE,
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OPTION_TRAILING_UNDERSCORE,
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OPTION_ALLOW_PASCAL_CASE,
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OPTION_ALLOW_SNAKE_CASE,
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OPTION_BAN_KEYWORDS,
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],
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},
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minLength: 0,
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maxLength: 5,
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},
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optionExamples: [[true, "ban-keywords", "check-format", "allow-leading-underscore"]],
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type: "style",
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typescriptOnly: false,
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};
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Rule.KEYWORD_FAILURE = "variable name clashes with keyword/type";
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exports.Rule = Rule;
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function parseOptions(ruleArguments) {
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var banKeywords = hasOption(OPTION_BAN_KEYWORDS);
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return {
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banKeywords: banKeywords,
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// check variable name formatting by default if no options are specified
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checkFormat: !banKeywords || hasOption(OPTION_CHECK_FORMAT),
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leadingUnderscore: hasOption(OPTION_LEADING_UNDERSCORE),
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trailingUnderscore: hasOption(OPTION_TRAILING_UNDERSCORE),
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allowPascalCase: hasOption(OPTION_ALLOW_PASCAL_CASE),
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allowSnakeCase: hasOption(OPTION_ALLOW_SNAKE_CASE),
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};
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function hasOption(name) {
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return ruleArguments.indexOf(name) !== -1;
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}
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}
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function walk(ctx) {
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var options = ctx.options, sourceFile = ctx.sourceFile;
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return ts.forEachChild(sourceFile, function cb(node) {
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switch (node.kind) {
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case ts.SyntaxKind.BindingElement: {
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var _a = node, initializer = _a.initializer, name = _a.name, propertyName = _a.propertyName;
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if (name.kind === ts.SyntaxKind.Identifier) {
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handleVariableNameKeyword(name);
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// A destructuring pattern that does not rebind an expression is always an alias, e.g. `var {Foo} = ...;`.
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// Only check if the name is rebound (`var {Foo: bar} = ...;`).
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if (node.parent.kind !== ts.SyntaxKind.ObjectBindingPattern || propertyName !== undefined) {
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handleVariableNameFormat(name, initializer);
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}
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}
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break;
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}
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case ts.SyntaxKind.VariableStatement:
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// skip 'declare' keywords
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if (Lint.hasModifier(node.modifiers, ts.SyntaxKind.DeclareKeyword)) {
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return;
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}
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break;
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case ts.SyntaxKind.Parameter:
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case ts.SyntaxKind.PropertyDeclaration:
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case ts.SyntaxKind.VariableDeclaration: {
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var _b = node, name = _b.name, initializer = _b.initializer;
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if (name.kind === ts.SyntaxKind.Identifier) {
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handleVariableNameFormat(name, initializer);
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// do not check property declarations for keywords, they are allowed to be keywords
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if (node.kind !== ts.SyntaxKind.PropertyDeclaration) {
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handleVariableNameKeyword(name);
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}
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}
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break;
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}
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}
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return ts.forEachChild(node, cb);
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});
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function handleVariableNameFormat(name, initializer) {
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if (!options.checkFormat) {
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return;
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}
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var text = name.text;
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if (initializer !== undefined && isAlias(text, initializer)) {
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return;
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}
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if (!isCamelCase(text, options) && !utils_1.isUpperCase(text)) {
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ctx.addFailureAtNode(name, formatFailure());
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}
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}
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function handleVariableNameKeyword(name) {
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if (options.banKeywords && bannedKeywordsSet.has(name.text)) {
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ctx.addFailureAtNode(name, Rule.KEYWORD_FAILURE);
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}
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}
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function formatFailure() {
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var failureMessage = "variable name must be in lowerCamelCase";
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if (options.allowPascalCase) {
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failureMessage += ", PascalCase";
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}
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if (options.allowSnakeCase) {
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failureMessage += ", snake_case";
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}
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return failureMessage + " or UPPER_CASE";
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}
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}
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function isAlias(name, initializer) {
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switch (initializer.kind) {
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case ts.SyntaxKind.PropertyAccessExpression:
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return initializer.name.text === name;
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case ts.SyntaxKind.Identifier:
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return initializer.text === name;
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default:
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return false;
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}
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}
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function isCamelCase(name, options) {
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var firstCharacter = name[0];
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var lastCharacter = name[name.length - 1];
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var middle = name.slice(1, -1);
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if (!options.leadingUnderscore && firstCharacter === "_") {
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return false;
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}
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if (!options.trailingUnderscore && lastCharacter === "_") {
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return false;
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}
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if (!options.allowPascalCase && !utils_1.isLowerCase(firstCharacter)) {
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return false;
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}
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if (!options.allowSnakeCase && middle.indexOf("_") !== -1) {
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return false;
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}
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return true;
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}
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var _a;
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