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node_modules/eslint/lib/rules/no-use-before-define.js
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/**
* @fileoverview Rule to flag use of variables before they are defined
* @author Ilya Volodin
* @copyright 2013 Ilya Volodin. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var astUtils = require("../ast-utils");
//------------------------------------------------------------------------------
// Constants
//------------------------------------------------------------------------------
var NO_FUNC = "nofunc";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
/**
* Finds and validates all variables in a given scope.
* @param {Scope} scope The scope object.
* @returns {void}
* @private
*/
function findVariablesInScope(scope) {
var typeOption = context.options[0];
/**
* Report the node
* @param {object} reference reference object
* @param {ASTNode} declaration node to evaluate
* @returns {void}
* @private
*/
function checkLocationAndReport(reference, declaration) {
if (typeOption !== NO_FUNC || declaration.defs[0].type !== "FunctionName") {
if (declaration.identifiers[0].range[1] > reference.identifier.range[1]) {
context.report(reference.identifier, "\"{{a}}\" was used before it was defined", {a: reference.identifier.name});
}
}
}
scope.references.forEach(function(reference) {
// if the reference is resolved check for declaration location
// if not, it could be function invocation, try to find manually
if (reference.resolved && reference.resolved.identifiers.length > 0) {
checkLocationAndReport(reference, reference.resolved);
} else {
var declaration = astUtils.getVariableByName(scope, reference.identifier.name);
// if there're no identifiers, this is a global environment variable
if (declaration && declaration.identifiers.length !== 0) {
checkLocationAndReport(reference, declaration);
}
}
});
}
/**
* Validates variables inside of a node's scope.
* @param {ASTNode} node The node to check.
* @returns {void}
* @private
*/
function findVariables() {
var scope = context.getScope();
findVariablesInScope(scope);
}
var ruleDefinition = {
"Program": function() {
var scope = context.getScope();
findVariablesInScope(scope);
// both Node.js and Modules have an extra scope
if (context.ecmaFeatures.globalReturn || context.ecmaFeatures.modules) {
findVariablesInScope(scope.childScopes[0]);
}
}
};
if (context.ecmaFeatures.blockBindings) {
ruleDefinition.BlockStatement = ruleDefinition.SwitchStatement = findVariables;
ruleDefinition.ArrowFunctionExpression = function(node) {
if (node.body.type !== "BlockStatement") {
findVariables(node);
}
};
} else {
ruleDefinition.FunctionExpression = ruleDefinition.FunctionDeclaration = ruleDefinition.ArrowFunctionExpression = findVariables;
}
return ruleDefinition;
};
module.exports.schema = [
{
"enum": ["nofunc"]
}
];
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