1 |
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2 | 'use strict';
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3 |
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4 | const path = require('path');
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5 | const loadPackageProp = require('./loadPackageProp');
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6 | const loadRc = require('./loadRc');
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7 | const loadJs = require('./loadJs');
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8 | const loadDefinedFile = require('./loadDefinedFile');
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9 | const funcRunner = require('./funcRunner');
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10 | const getDirectory = require('./getDirectory');
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11 |
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12 | module.exports = function createExplorer(options
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13 |
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14 |
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15 |
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16 |
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17 |
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18 |
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19 |
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20 |
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21 |
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22 |
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23 |
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24 | ) {
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25 |
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26 |
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27 | const fileCache = options.cache ? new Map() : null;
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28 | const directoryCache = options.cache ? new Map() : null;
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29 | const transform = options.transform || identity;
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30 | const packageProp = options.packageProp;
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31 |
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32 | function clearFileCache() {
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33 | if (fileCache) fileCache.clear();
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34 | }
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35 |
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36 | function clearDirectoryCache() {
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37 | if (directoryCache) directoryCache.clear();
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38 | }
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39 |
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40 | function clearCaches() {
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41 | clearFileCache();
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42 | clearDirectoryCache();
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43 | }
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44 |
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45 | function throwError(error) {
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46 | if (options.sync) {
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47 | throw error;
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48 | } else {
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49 | return Promise.reject(error);
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50 | }
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51 | }
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52 |
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53 | function load(
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54 | searchPath ,
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55 | configPath
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56 | ) {
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57 | if (!configPath && options.configPath) {
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58 | configPath = options.configPath;
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59 | }
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60 |
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61 | if (configPath) {
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62 | const absoluteConfigPath = path.resolve(process.cwd(), configPath);
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63 | if (fileCache && fileCache.has(absoluteConfigPath)) {
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64 | return fileCache.get(absoluteConfigPath);
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65 | }
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66 |
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67 | let load;
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68 | if (path.basename(absoluteConfigPath) === 'package.json') {
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69 | if (!packageProp) {
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70 | return throwError(
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71 | new Error(
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72 | 'Please specify the packageProp option. The configPath argument cannot point to a package.json file if packageProp is false.'
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73 | )
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74 | );
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75 | }
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76 | load = () =>
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77 | loadPackageProp(path.dirname(absoluteConfigPath), {
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78 | packageProp,
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79 | sync: options.sync,
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80 | });
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81 | } else {
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82 | load = () =>
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83 | loadDefinedFile(absoluteConfigPath, {
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84 | sync: options.sync,
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85 | format: options.format,
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86 | });
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87 | }
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88 |
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89 | const loadResult = load();
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90 | const result =
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91 | loadResult instanceof Promise
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92 | ? loadResult.then(transform)
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93 | : transform(loadResult);
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94 | if (fileCache) fileCache.set(absoluteConfigPath, result);
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95 | return result;
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96 | }
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97 |
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98 | if (!searchPath) return !options.sync ? Promise.resolve(null) : null;
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99 |
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100 | const absoluteSearchPath = path.resolve(process.cwd(), searchPath);
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101 | const searchPathDir = getDirectory(absoluteSearchPath, options.sync);
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102 |
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103 | return searchPathDir instanceof Promise
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104 | ? searchPathDir.then(searchDirectory)
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105 | : searchDirectory(searchPathDir);
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106 | }
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107 |
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108 | function searchDirectory(
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109 | directory
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110 | ) {
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111 | if (directoryCache && directoryCache.has(directory)) {
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112 | return directoryCache.get(directory);
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113 | }
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114 |
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115 | const result = funcRunner(!options.sync ? Promise.resolve() : undefined, [
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116 | () => {
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117 | if (!packageProp) return;
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118 | return loadPackageProp(directory, {
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119 | packageProp,
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120 | sync: options.sync,
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121 | });
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122 | },
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123 | result => {
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124 | if (result || !options.rc) return result;
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125 | return loadRc(path.join(directory, options.rc), {
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126 | sync: options.sync,
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127 | rcStrictJson: options.rcStrictJson,
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128 | rcExtensions: options.rcExtensions,
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129 | });
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130 | },
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131 | result => {
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132 | if (result || !options.js) return result;
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133 | return loadJs(path.join(directory, options.js), { sync: options.sync });
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134 | },
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135 | result => {
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136 | if (result) return result;
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137 |
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138 | const nextDirectory = path.dirname(directory);
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139 |
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140 | if (nextDirectory === directory || directory === options.stopDir)
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141 | return null;
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142 |
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143 | return searchDirectory(nextDirectory);
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144 | },
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145 | transform,
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146 | ]);
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147 |
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148 | if (directoryCache) directoryCache.set(directory, result);
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149 | return result;
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150 | }
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151 |
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152 | return {
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153 | load,
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154 | clearFileCache,
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155 | clearDirectoryCache,
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156 | clearCaches,
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157 | };
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158 | };
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159 |
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160 | function identity(x) {
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161 | return x;
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162 | }
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