LukasMeine /
vigilance
| Conditions | 45 |
| Paths | 9728 |
| Total Lines | 219 |
| Code Lines | 135 |
| Lines | 0 |
| Ratio | 0 % |
| Changes | 0 | ||
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
Complex classes like module.exports often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
| 1 | module.exports = function (args, opts) { |
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| 2 | if (!opts) opts = {}; |
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| 3 | |||
| 4 | var flags = { bools : {}, strings : {}, unknownFn: null }; |
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| 5 | |||
| 6 | if (typeof opts['unknown'] === 'function') { |
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| 7 | flags.unknownFn = opts['unknown']; |
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| 8 | } |
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| 9 | |||
| 10 | if (typeof opts['boolean'] === 'boolean' && opts['boolean']) { |
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| 11 | flags.allBools = true; |
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| 12 | } else { |
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| 13 | [].concat(opts['boolean']).filter(Boolean).forEach(function (key) { |
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| 14 | flags.bools[key] = true; |
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| 15 | }); |
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| 16 | } |
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| 17 | |||
| 18 | var aliases = {}; |
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| 19 | Object.keys(opts.alias || {}).forEach(function (key) { |
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| 20 | aliases[key] = [].concat(opts.alias[key]); |
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| 21 | aliases[key].forEach(function (x) { |
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| 22 | aliases[x] = [key].concat(aliases[key].filter(function (y) { |
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| 23 | return x !== y; |
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| 24 | })); |
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| 25 | }); |
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| 26 | }); |
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| 27 | |||
| 28 | [].concat(opts.string).filter(Boolean).forEach(function (key) { |
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| 29 | flags.strings[key] = true; |
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| 30 | if (aliases[key]) { |
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| 31 | flags.strings[aliases[key]] = true; |
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| 32 | } |
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| 33 | }); |
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| 34 | |||
| 35 | var defaults = opts['default'] || {}; |
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| 36 | |||
| 37 | var argv = { _ : [] }; |
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| 38 | Object.keys(flags.bools).forEach(function (key) { |
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| 39 | setArg(key, defaults[key] === undefined ? false : defaults[key]); |
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| 40 | }); |
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| 41 | |||
| 42 | var notFlags = []; |
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| 43 | |||
| 44 | if (args.indexOf('--') !== -1) { |
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| 45 | notFlags = args.slice(args.indexOf('--')+1); |
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| 46 | args = args.slice(0, args.indexOf('--')); |
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| 47 | } |
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| 48 | |||
| 49 | function argDefined(key, arg) { |
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| 50 | return (flags.allBools && /^--[^=]+$/.test(arg)) || |
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| 51 | flags.strings[key] || flags.bools[key] || aliases[key]; |
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| 52 | } |
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| 53 | |||
| 54 | function setArg (key, val, arg) { |
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| 55 | if (arg && flags.unknownFn && !argDefined(key, arg)) { |
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| 56 | if (flags.unknownFn(arg) === false) return; |
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| 57 | } |
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| 58 | |||
| 59 | var value = !flags.strings[key] && isNumber(val) |
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| 60 | ? Number(val) : val |
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| 61 | ; |
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| 62 | setKey(argv, key.split('.'), value); |
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| 63 | |||
| 64 | (aliases[key] || []).forEach(function (x) { |
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| 65 | setKey(argv, x.split('.'), value); |
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| 66 | }); |
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| 67 | } |
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| 68 | |||
| 69 | function setKey (obj, keys, value) { |
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| 70 | var o = obj; |
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| 71 | keys.slice(0,-1).forEach(function (key) { |
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| 72 | if (o[key] === undefined) o[key] = {}; |
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| 73 | o = o[key]; |
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| 74 | }); |
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| 75 | |||
| 76 | var key = keys[keys.length - 1]; |
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| 77 | if (o[key] === undefined || flags.bools[key] || typeof o[key] === 'boolean') { |
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| 78 | o[key] = value; |
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| 79 | } |
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| 80 | else if (Array.isArray(o[key])) { |
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| 81 | o[key].push(value); |
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| 82 | } |
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| 83 | else { |
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| 84 | o[key] = [ o[key], value ]; |
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| 85 | } |
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| 86 | } |
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| 87 | |||
| 88 | function aliasIsBoolean(key) { |
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| 89 | return aliases[key].some(function (x) { |
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| 90 | return flags.bools[x]; |
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| 91 | }); |
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| 92 | } |
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| 93 | |||
| 94 | for (var i = 0; i < args.length; i++) { |
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| 95 | var arg = args[i]; |
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| 96 | |||
| 97 | if (/^--.+=/.test(arg)) { |
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| 98 | // Using [\s\S] instead of . because js doesn't support the |
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| 99 | // 'dotall' regex modifier. See: |
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| 100 | // http://stackoverflow.com/a/1068308/13216 |
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| 101 | var m = arg.match(/^--([^=]+)=([\s\S]*)$/); |
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| 102 | var key = m[1]; |
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| 103 | var value = m[2]; |
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| 104 | if (flags.bools[key]) { |
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| 105 | value = value !== 'false'; |
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| 106 | } |
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| 107 | setArg(key, value, arg); |
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| 108 | } |
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| 109 | else if (/^--no-.+/.test(arg)) { |
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| 110 | var key = arg.match(/^--no-(.+)/)[1]; |
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| 111 | setArg(key, false, arg); |
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| 112 | } |
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| 113 | else if (/^--.+/.test(arg)) { |
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| 114 | var key = arg.match(/^--(.+)/)[1]; |
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| 115 | var next = args[i + 1]; |
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| 116 | if (next !== undefined && !/^-/.test(next) |
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| 117 | && !flags.bools[key] |
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| 118 | && !flags.allBools |
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| 119 | && (aliases[key] ? !aliasIsBoolean(key) : true)) { |
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| 120 | setArg(key, next, arg); |
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| 121 | i++; |
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| 122 | } |
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| 123 | else if (/^(true|false)$/.test(next)) { |
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| 124 | setArg(key, next === 'true', arg); |
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| 125 | i++; |
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| 126 | } |
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| 127 | else { |
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| 128 | setArg(key, flags.strings[key] ? '' : true, arg); |
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| 129 | } |
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| 130 | } |
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| 131 | else if (/^-[^-]+/.test(arg)) { |
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| 132 | var letters = arg.slice(1,-1).split(''); |
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| 133 | |||
| 134 | var broken = false; |
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| 135 | for (var j = 0; j < letters.length; j++) { |
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| 136 | var next = arg.slice(j+2); |
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| 137 | |||
| 138 | if (next === '-') { |
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| 139 | setArg(letters[j], next, arg) |
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| 140 | continue; |
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| 141 | } |
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| 142 | |||
| 143 | if (/[A-Za-z]/.test(letters[j]) && /=/.test(next)) { |
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| 144 | setArg(letters[j], next.split('=')[1], arg); |
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| 145 | broken = true; |
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| 146 | break; |
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| 147 | } |
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| 148 | |||
| 149 | if (/[A-Za-z]/.test(letters[j]) |
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| 150 | && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) { |
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| 151 | setArg(letters[j], next, arg); |
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| 152 | broken = true; |
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| 153 | break; |
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| 154 | } |
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| 155 | |||
| 156 | if (letters[j+1] && letters[j+1].match(/\W/)) { |
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| 157 | setArg(letters[j], arg.slice(j+2), arg); |
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| 158 | broken = true; |
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| 159 | break; |
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| 160 | } |
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| 161 | else { |
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| 162 | setArg(letters[j], flags.strings[letters[j]] ? '' : true, arg); |
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| 163 | } |
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| 164 | } |
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| 165 | |||
| 166 | var key = arg.slice(-1)[0]; |
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| 167 | if (!broken && key !== '-') { |
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| 168 | if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1]) |
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| 169 | && !flags.bools[key] |
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| 170 | && (aliases[key] ? !aliasIsBoolean(key) : true)) { |
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| 171 | setArg(key, args[i+1], arg); |
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| 172 | i++; |
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| 173 | } |
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| 174 | else if (args[i+1] && /true|false/.test(args[i+1])) { |
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| 175 | setArg(key, args[i+1] === 'true', arg); |
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| 176 | i++; |
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| 177 | } |
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| 178 | else { |
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| 179 | setArg(key, flags.strings[key] ? '' : true, arg); |
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| 180 | } |
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| 181 | } |
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| 182 | } |
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| 183 | else { |
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| 184 | if (!flags.unknownFn || flags.unknownFn(arg) !== false) { |
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| 185 | argv._.push( |
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| 186 | flags.strings['_'] || !isNumber(arg) ? arg : Number(arg) |
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| 187 | ); |
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| 188 | } |
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| 189 | if (opts.stopEarly) { |
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| 190 | argv._.push.apply(argv._, args.slice(i + 1)); |
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| 191 | break; |
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| 192 | } |
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| 193 | } |
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| 194 | } |
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| 195 | |||
| 196 | Object.keys(defaults).forEach(function (key) { |
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| 197 | if (!hasKey(argv, key.split('.'))) { |
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| 198 | setKey(argv, key.split('.'), defaults[key]); |
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| 199 | |||
| 200 | (aliases[key] || []).forEach(function (x) { |
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| 201 | setKey(argv, x.split('.'), defaults[key]); |
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| 202 | }); |
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| 203 | } |
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| 204 | }); |
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| 205 | |||
| 206 | if (opts['--']) { |
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| 207 | argv['--'] = new Array(); |
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| 208 | notFlags.forEach(function(key) { |
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| 209 | argv['--'].push(key); |
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| 210 | }); |
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| 211 | } |
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| 212 | else { |
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| 213 | notFlags.forEach(function(key) { |
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| 214 | argv._.push(key); |
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| 215 | }); |
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| 216 | } |
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| 217 | |||
| 218 | return argv; |
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| 219 | }; |
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| 220 | |||
| 237 |
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Consider adding curly braces around all statements when they are executed conditionally. This is optional if there is only one statement, but leaving them out can lead to unexpected behaviour if another statement is added later.
Consider:
If you or someone else later decides to put another statement in, only the first statement will be executed.
In this case the statement
b = 42will always be executed, while the logging statement will be executed conditionally.ensures that the proper code will be executed conditionally no matter how many statements are added or removed.