module.exports = function (args, opts) { if (!opts) opts = {}; var flags = { bools : {}, strings : {}, unknownFn: null }; if (typeof opts['unknown'] === 'function') { flags.unknownFn = opts['unknown']; } if (typeof opts['boolean'] === 'boolean' && opts['boolean']) { flags.allBools = true; } else { [].concat(opts['boolean']).filter(Boolean).forEach(function (key) { flags.bools[key] = true; }); } var aliases = {}; Object.keys(opts.alias || {}).forEach(function (key) { aliases[key] = [].concat(opts.alias[key]); aliases[key].forEach(function (x) { aliases[x] = [key].concat(aliases[key].filter(function (y) { return x !== y; })); }); }); [].concat(opts.string).filter(Boolean).forEach(function (key) { flags.strings[key] = true; if (aliases[key]) { flags.strings[aliases[key]] = true; } }); var defaults = opts['default'] || {}; var argv = { _ : [] }; Object.keys(flags.bools).forEach(function (key) { setArg(key, defaults[key] === undefined ? false : defaults[key]); }); var notFlags = []; if (args.indexOf('--') !== -1) { notFlags = args.slice(args.indexOf('--')+1); args = args.slice(0, args.indexOf('--')); } function argDefined(key, arg) { return (flags.allBools && /^--[^=]+$/.test(arg)) || flags.strings[key] || flags.bools[key] || aliases[key]; } function setArg (key, val, arg) { if (arg && flags.unknownFn && !argDefined(key, arg)) { if (flags.unknownFn(arg) === false) return; } var value = !flags.strings[key] && isNumber(val) ? Number(val) : val ; setKey(argv, key.split('.'), value); (aliases[key] || []).forEach(function (x) { setKey(argv, x.split('.'), value); }); } function setKey (obj, keys, value) { var o = obj; for (var i = 0; i < keys.length-1; i++) { var key = keys[i]; if (isConstructorOrProto(o, key)) return; if (o[key] === undefined) o[key] = {}; if (o[key] === Object.prototype || o[key] === Number.prototype || o[key] === String.prototype) o[key] = {}; if (o[key] === Array.prototype) o[key] = []; o = o[key]; } var key = keys[keys.length - 1]; if (isConstructorOrProto(o, key)) return; if (o === Object.prototype || o === Number.prototype || o === String.prototype) o = {}; if (o === Array.prototype) o = []; if (o[key] === undefined || flags.bools[key] || typeof o[key] === 'boolean') { o[key] = value; } else if (Array.isArray(o[key])) { o[key].push(value); } else { o[key] = [ o[key], value ]; } } function aliasIsBoolean(key) { return aliases[key].some(function (x) { return flags.bools[x]; }); } for (var i = 0; i < args.length; i++) { var arg = args[i]; if (/^--.+=/.test(arg)) { // Using [\s\S] instead of . because js doesn't support the // 'dotall' regex modifier. See: // http://stackoverflow.com/a/1068308/13216 var m = arg.match(/^--([^=]+)=([\s\S]*)$/); var key = m[1]; var value = m[2]; if (flags.bools[key]) { value = value !== 'false'; } setArg(key, value, arg); } else if (/^--no-.+/.test(arg)) { var key = arg.match(/^--no-(.+)/)[1]; setArg(key, false, arg); } else if (/^--.+/.test(arg)) { var key = arg.match(/^--(.+)/)[1]; var next = args[i + 1]; if (next !== undefined && !/^-/.test(next) && !flags.bools[key] && !flags.allBools && (aliases[key] ? !aliasIsBoolean(key) : true)) { setArg(key, next, arg); i++; } else if (/^(true|false)$/.test(next)) { setArg(key, next === 'true', arg); i++; } else { setArg(key, flags.strings[key] ? '' : true, arg); } } else if (/^-[^-]+/.test(arg)) { var letters = arg.slice(1,-1).split(''); var broken = false; for (var j = 0; j < letters.length; j++) { var next = arg.slice(j+2); if (next === '-') { setArg(letters[j], next, arg) continue; } if (/[A-Za-z]/.test(letters[j]) && /=/.test(next)) { setArg(letters[j], next.split('=')[1], arg); broken = true; break; } if (/[A-Za-z]/.test(letters[j]) && /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) { setArg(letters[j], next, arg); broken = true; break; } if (letters[j+1] && letters[j+1].match(/\W/)) { setArg(letters[j], arg.slice(j+2), arg); broken = true; break; } else { setArg(letters[j], flags.strings[letters[j]] ? '' : true, arg); } } var key = arg.slice(-1)[0]; if (!broken && key !== '-') { if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1]) && !flags.bools[key] && (aliases[key] ? !aliasIsBoolean(key) : true)) { setArg(key, args[i+1], arg); i++; } else if (args[i+1] && /^(true|false)$/.test(args[i+1])) { setArg(key, args[i+1] === 'true', arg); i++; } else { setArg(key, flags.strings[key] ? '' : true, arg); } } } else { if (!flags.unknownFn || flags.unknownFn(arg) !== false) { argv._.push( flags.strings['_'] || !isNumber(arg) ? arg : Number(arg) ); } if (opts.stopEarly) { argv._.push.apply(argv._, args.slice(i + 1)); break; } } } Object.keys(defaults).forEach(function (key) { if (!hasKey(argv, key.split('.'))) { setKey(argv, key.split('.'), defaults[key]); (aliases[key] || []).forEach(function (x) { setKey(argv, x.split('.'), defaults[key]); }); } }); if (opts['--']) { argv['--'] = new Array(); notFlags.forEach(function(key) { argv['--'].push(key); }); } else { notFlags.forEach(function(key) { argv._.push(key); }); } return argv; }; function hasKey (obj, keys) { var o = obj; keys.slice(0,-1).forEach(function (key) { o = (o[key] || {}); }); var key = keys[keys.length - 1]; return key in o; } function isNumber (x) { if (typeof x === 'number') return true; if (/^0x[0-9a-f]+$/i.test(x)) return true; return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x); } function isConstructorOrProto (obj, key) { return key === 'constructor' && typeof obj[key] === 'function' || key === '__proto__'; }