noStringLiteralRule.js
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"use strict";
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var ts = require("typescript");
var Lint = require("../lint");
var Rule = (function (_super) {
__extends(Rule, _super);
function Rule() {
_super.apply(this, arguments);
}
Rule.prototype.apply = function (sourceFile) {
return this.applyWithWalker(new NoStringLiteralWalker(sourceFile, this.getOptions()));
};
Rule.metadata = {
ruleName: "no-string-literal",
description: "Disallows object access via string literals.",
rationale: "Encourages using strongly-typed property access.",
optionsDescription: "Not configurable.",
options: null,
optionExamples: ["true"],
type: "functionality",
};
Rule.FAILURE_STRING = "object access via string literals is disallowed";
return Rule;
}(Lint.Rules.AbstractRule));
exports.Rule = Rule;
var NoStringLiteralWalker = (function (_super) {
__extends(NoStringLiteralWalker, _super);
function NoStringLiteralWalker() {
_super.apply(this, arguments);
}
NoStringLiteralWalker.prototype.visitElementAccessExpression = function (node) {
var argument = node.argumentExpression;
if (argument != null) {
var accessorText = argument.getText();
if (argument.kind === ts.SyntaxKind.StringLiteral && accessorText.length > 2) {
var unquotedAccessorText = accessorText.substring(1, accessorText.length - 1);
if (isValidIdentifier(unquotedAccessorText)) {
this.addFailure(this.createFailure(argument.getStart(), argument.getWidth(), Rule.FAILURE_STRING));
}
}
}
_super.prototype.visitElementAccessExpression.call(this, node);
};
return NoStringLiteralWalker;
}(Lint.RuleWalker));
function isValidIdentifier(token) {
var scanner = ts.createScanner(ts.ScriptTarget.ES5, false, ts.LanguageVariant.Standard, token);
scanner.scan();
return scanner.getTokenText() === token && scanner.isIdentifier();
}