mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.9 KiB
90 lines
2.9 KiB
/**
|
|
* @fileoverview Rule to flag references to undeclared variables.
|
|
* @author Mark Macdonald
|
|
* @copyright 2015 Nicholas C. Zakas. All rights reserved.
|
|
* @copyright 2013 Mark Macdonald. All rights reserved.
|
|
*/
|
|
"use strict";
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
// none!
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Helpers
|
|
//------------------------------------------------------------------------------
|
|
|
|
function isImplicitGlobal(variable) {
|
|
return variable.defs.every(function(def) {
|
|
return def.type === "ImplicitGlobalVariable";
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Gets the declared variable, defined in `scope`, that `ref` refers to.
|
|
* @param {Scope} scope The scope in which to search.
|
|
* @param {Reference} ref The reference to find in the scope.
|
|
* @returns {Variable} The variable, or null if ref refers to an undeclared variable.
|
|
*/
|
|
function getDeclaredGlobalVariable(scope, ref) {
|
|
var declaredGlobal = null;
|
|
scope.variables.some(function(variable) {
|
|
if (variable.name === ref.identifier.name) {
|
|
// If it's an implicit global, it must have a `writeable` field (indicating it was declared)
|
|
if (!isImplicitGlobal(variable) || {}.hasOwnProperty.call(variable, "writeable")) {
|
|
declaredGlobal = variable;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
});
|
|
return declaredGlobal;
|
|
}
|
|
|
|
/**
|
|
* Checks if the given node is the argument of a typeof operator.
|
|
* @param {ASTNode} node The AST node being checked.
|
|
* @returns {boolean} Whether or not the node is the argument of a typeof operator.
|
|
*/
|
|
function hasTypeOfOperator(node) {
|
|
var parent = node.parent;
|
|
return parent.type === "UnaryExpression" && parent.operator === "typeof";
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Rule Definition
|
|
//------------------------------------------------------------------------------
|
|
|
|
module.exports = function(context) {
|
|
|
|
var NOT_DEFINED_MESSAGE = "\"{{name}}\" is not defined.",
|
|
READ_ONLY_MESSAGE = "\"{{name}}\" is read only.";
|
|
|
|
return {
|
|
|
|
"Program:exit": function(/*node*/) {
|
|
|
|
var globalScope = context.getScope();
|
|
|
|
globalScope.through.forEach(function(ref) {
|
|
var variable = getDeclaredGlobalVariable(globalScope, ref),
|
|
name = ref.identifier.name;
|
|
|
|
if (hasTypeOfOperator(ref.identifier)) {
|
|
return;
|
|
}
|
|
|
|
if (!variable) {
|
|
context.report(ref.identifier, NOT_DEFINED_MESSAGE, { name: name });
|
|
} else if (ref.isWrite() && variable.writeable === false) {
|
|
context.report(ref.identifier, READ_ONLY_MESSAGE, { name: name });
|
|
}
|
|
});
|
|
|
|
}
|
|
|
|
};
|
|
|
|
};
|
|
|