rule-context.js
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/**
* @fileoverview RuleContext utility for rules
* @author Nicholas C. Zakas
* @copyright 2013 Nicholas C. Zakas. All rights reserved.
* See LICENSE file in root directory for full license.
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var RuleFixer = require("./util/rule-fixer");
//------------------------------------------------------------------------------
// Constants
//------------------------------------------------------------------------------
var PASSTHROUGHS = [
"getAllComments",
"getAncestors",
"getComments",
"getDeclaredVariables",
"getFilename",
"getFirstToken",
"getFirstTokens",
"getJSDocComment",
"getLastToken",
"getLastTokens",
"getNodeByRangeIndex",
"getScope",
"getSource",
"getSourceLines",
"getTokenAfter",
"getTokenBefore",
"getTokenByRangeStart",
"getTokens",
"getTokensAfter",
"getTokensBefore",
"getTokensBetween",
"markVariableAsUsed",
"isMarkedAsUsed"
];
//------------------------------------------------------------------------------
// Typedefs
//------------------------------------------------------------------------------
/**
* An error message description
* @typedef {Object} MessageDescriptor
* @property {string} nodeType The type of node.
* @property {Location} loc The location of the problem.
* @property {string} message The problem message.
* @property {Object} [data] Optional data to use to fill in placeholders in the
* message.
* @property {Function} fix The function to call that creates a fix command.
*/
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
/**
* Acts as an abstraction layer between rules and the main eslint object.
* @constructor
* @param {string} ruleId The ID of the rule using this object.
* @param {eslint} eslint The eslint object.
* @param {number} severity The configured severity level of the rule.
* @param {array} options The configuration information to be added to the rule.
* @param {object} settings The configuration settings passed from the config file.
* @param {object} ecmaFeatures The ecmaFeatures settings passed from the config file.
*/
function RuleContext(ruleId, eslint, severity, options, settings, ecmaFeatures) {
/**
* The read-only ID of the rule.
*/
Object.defineProperty(this, "id", {
value: ruleId
});
/**
* The read-only options of the rule
*/
Object.defineProperty(this, "options", {
value: options
});
/**
* The read-only settings shared between all rules
*/
Object.defineProperty(this, "settings", {
value: settings
});
/**
* The read-only ecmaFeatures shared across all rules
*/
Object.defineProperty(this, "ecmaFeatures", {
value: Object.create(ecmaFeatures)
});
Object.freeze(this.ecmaFeatures);
// copy over passthrough methods
PASSTHROUGHS.forEach(function(name) {
this[name] = function() {
return eslint[name].apply(eslint, arguments);
};
}, this);
/**
* Passthrough to eslint.report() that automatically assigns the rule ID and severity.
* @param {ASTNode|MessageDescriptor} nodeOrDescriptor The AST node related to the message or a message
* descriptor.
* @param {Object=} location The location of the error.
* @param {string} message The message to display to the user.
* @param {Object} opts Optional template data which produces a formatted message
* with symbols being replaced by this object's values.
* @returns {void}
*/
this.report = function(nodeOrDescriptor, location, message, opts) {
var descriptor,
fix = null;
// check to see if it's a new style call
if (arguments.length === 1) {
descriptor = nodeOrDescriptor;
// if there's a fix specified, get it
if (typeof descriptor.fix === "function") {
fix = descriptor.fix(new RuleFixer());
}
eslint.report(
ruleId, severity, descriptor.node,
descriptor.loc || descriptor.node.loc.start,
descriptor.message, descriptor.data, fix
);
return;
}
// old style call
eslint.report(ruleId, severity, nodeOrDescriptor, location, message, opts);
};
/**
* Passthrough to eslint.getSourceCode().
* @returns {SourceCode} The SourceCode object for the code.
*/
this.getSourceCode = function() {
return eslint.getSourceCode();
};
}
RuleContext.prototype = {
constructor: RuleContext
};
module.exports = RuleContext;