variable.js
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/**
* @fileoverview Utility functions for React components detection
* @author Yannick Croissant
*/
'use strict';
/**
* Record that a particular variable has been used in code
*
* @param {Object} context The current rule context.
* @param {String} name The name of the variable to mark as used.
* @returns {Boolean} True if the variable was found and marked as used, false if not.
*/
function markVariableAsUsed(context, name) {
var scope = context.getScope();
var variables;
var i;
var len;
var found = false;
// Special Node.js scope means we need to start one level deeper
if (scope.type === 'global') {
while (scope.childScopes.length) {
scope = scope.childScopes[0];
}
}
do {
variables = scope.variables;
for (i = 0, len = variables.length; i < len; i++) {
if (variables[i].name === name) {
variables[i].eslintUsed = true;
found = true;
}
}
scope = scope.upper;
} while (scope);
return found;
}
/**
* Search a particular variable in a list
* @param {Array} variables The variables list.
* @param {Array} name The name of the variable to search.
* @returns {Boolean} True if the variable was found, false if not.
*/
function findVariable(variables, name) {
var i;
var len;
for (i = 0, len = variables.length; i < len; i++) {
if (variables[i].name === name) {
return true;
}
}
return false;
}
/**
* List all variable in a given scope
*
* Contain a patch for babel-eslint to avoid https://github.com/babel/babel-eslint/issues/21
*
* @param {Object} context The current rule context.
* @param {Array} name The name of the variable to search.
* @returns {Boolean} True if the variable was found, false if not.
*/
function variablesInScope(context) {
var scope = context.getScope();
var variables = scope.variables;
while (scope.type !== 'global') {
scope = scope.upper;
variables = scope.variables.concat(variables);
}
if (scope.childScopes.length) {
variables = scope.childScopes[0].variables.concat(variables);
if (scope.childScopes[0].childScopes.length) {
variables = scope.childScopes[0].childScopes[0].variables.concat(variables);
}
}
return variables;
}
module.exports = {
findVariable: findVariable,
variablesInScope: variablesInScope,
markVariableAsUsed: markVariableAsUsed
};