| /** |
| * @fileoverview Utility functions for React components detection |
| * @author Yannick Croissant |
| */ |
| |
| 'use strict'; |
| |
| /** |
| * Search a particular variable in a list |
| * @param {Array} variables The variables list. |
| * @param {string} name The name of the variable to search. |
| * @returns {Boolean} True if the variable was found, false if not. |
| */ |
| function findVariable(variables, name) { |
| return variables.some(variable => variable.name === name); |
| } |
| |
| /** |
| * Find and return a particular variable in a list |
| * @param {Array} variables The variables list. |
| * @param {string} name The name of the variable to search. |
| * @returns {Object} Variable if the variable was found, null if not. |
| */ |
| function getVariable(variables, name) { |
| return variables.find(variable => variable.name === name); |
| } |
| |
| /** |
| * 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. |
| * @returns {Array} The variables list |
| */ |
| function variablesInScope(context) { |
| let scope = context.getScope(); |
| let 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); |
| } |
| } |
| variables.reverse(); |
| |
| return variables; |
| } |
| |
| /** |
| * Find a variable by name in the current scope. |
| * @param {Object} context The current rule context. |
| * @param {string} name Name of the variable to look for. |
| * @returns {ASTNode|null} Return null if the variable could not be found, ASTNode otherwise. |
| */ |
| function findVariableByName(context, name) { |
| const variable = getVariable(variablesInScope(context), name); |
| |
| if (!variable || !variable.defs[0] || !variable.defs[0].node) { |
| return null; |
| } |
| |
| if (variable.defs[0].node.type === 'TypeAlias') { |
| return variable.defs[0].node.right; |
| } |
| |
| return variable.defs[0].node.init; |
| } |
| |
| module.exports = { |
| findVariable, |
| findVariableByName, |
| getVariable, |
| variablesInScope |
| }; |