no-func-assign.js
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/**
* @fileoverview Rule to flag use of function declaration identifiers as variables.
* @author Ian Christian Myers
* @copyright 2013 Ian Christian Myers. All rights reserved.
*/
"use strict";
var astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var unresolved = Object.create(null);
/**
* Collects unresolved references from the global scope, then creates a map to references from its name.
* Usage of the map is explained at `checkVariable(variable)`.
* @returns {void}
*/
function collectUnresolvedReferences() {
unresolved = Object.create(null);
var references = context.getScope().through;
for (var i = 0; i < references.length; ++i) {
var reference = references[i];
var name = reference.identifier.name;
if (name in unresolved === false) {
unresolved[name] = [];
}
unresolved[name].push(reference);
}
}
/**
* Reports a reference if is non initializer and writable.
* @param {References} references - Collection of reference to check.
* @returns {void}
*/
function checkReference(references) {
astUtils.getModifyingReferences(references).forEach(function(reference) {
context.report(
reference.identifier,
"'{{name}}' is a function.",
{name: reference.identifier.name});
});
}
/**
* Finds and reports references that are non initializer and writable.
* @param {Variable} variable - A variable to check.
* @returns {void}
*/
function checkVariable(variable) {
if (variable.defs[0].type === "FunctionName") {
// If the function is in global scope, its references are not resolved (by escope's design).
// So when references of the function are nothing, this checks in unresolved.
if (variable.references.length > 0) {
checkReference(variable.references);
} else if (unresolved[variable.name]) {
checkReference(unresolved[variable.name]);
}
}
}
/**
* Checks parameters of a given function node.
* @param {ASTNode} node - A function node to check.
* @returns {void}
*/
function checkForFunction(node) {
context.getDeclaredVariables(node).forEach(checkVariable);
}
return {
"Program": collectUnresolvedReferences,
"FunctionDeclaration": checkForFunction,
"FunctionExpression": checkForFunction
};
};
module.exports.schema = [];