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/**
* @fileoverview A rule to verify `super()` callings in constructor.
* @author Toru Nagashima
* @copyright 2015 Toru Nagashima. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
/**
* Searches a class node from ancestors of a node.
* @param {Node} node - A node to get.
* @returns {ClassDeclaration|ClassExpression|null} the found class node or `null`.
*/
function getClassInAncestor(node) {
while (node) {
if (node.type === "ClassDeclaration" || node.type === "ClassExpression") {
return node;
}
node = node.parent;
}
/* istanbul ignore next */
return null;
}
/**
* Checks whether or not a node is the null literal.
* @param {Node} node - A node to check.
* @returns {boolean} whether or not a node is the null literal.
*/
function isNullLiteral(node) {
return node && node.type === "Literal" && node.value === null;
}
/**
* Checks whether or not the current traversal context is on constructors.
* @param {{scope: Scope}} item - A checking context to check.
* @returns {boolean} whether or not the current traversal context is on constructors.
*/
function isOnConstructor(item) {
return item && item.scope === context.getScope().variableScope.upper.variableScope;
}
// A stack for checking context.
var stack = [];
return {
/**
* Start checking.
* @param {MethodDefinition} node - A target node.
* @returns {void}
*/
"MethodDefinition": function(node) {
if (node.kind !== "constructor") {
return;
}
stack.push({
superCallings: [],
scope: context.getScope().variableScope
});
},
/**
* Checks the result, then reports invalid/missing `super()`.
* @param {MethodDefinition} node - A target node.
* @returns {void}
*/
"MethodDefinition:exit": function(node) {
if (node.kind !== "constructor") {
return;
}
var result = stack.pop();
var classNode = getClassInAncestor(node);
/* istanbul ignore if */
if (!classNode) {
return;
}
if (classNode.superClass === null || isNullLiteral(classNode.superClass)) {
result.superCallings.forEach(function(superCalling) {
context.report(superCalling, "unexpected `super()`.");
});
} else if (result.superCallings.length === 0) {
context.report(node.key, "this constructor requires `super()`.");
}
},
/**
* Checks the result of checking, then reports invalid/missing `super()`.
* @param {MethodDefinition} node - A target node.
* @returns {void}
*/
"CallExpression": function(node) {
var item = stack[stack.length - 1];
if (isOnConstructor(item) && node.callee.type === "Super") {
item.superCallings.push(node);
}
}
};
};
module.exports.schema = [];
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