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notes/node_modules/yargs/lib/minimist.js

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2017-03-09 13:16:08 -05:00
var path = require('path');
var fs = require('fs');
module.exports = function (args, opts) {
if (!opts) opts = {};
var flags = { bools : {}, strings : {}, counts: {}, normalize: {}, configs: {} };
[].concat(opts['boolean']).filter(Boolean).forEach(function (key) {
flags.bools[key] = true;
});
[].concat(opts.string).filter(Boolean).forEach(function (key) {
flags.strings[key] = true;
});
[].concat(opts.count).filter(Boolean).forEach(function (key) {
flags.counts[key] = true;
});
[].concat(opts.normalize).filter(Boolean).forEach(function (key) {
flags.normalize[key] = true;
});
[].concat(opts.config).filter(Boolean).forEach(function (key) {
flags.configs[key] = true;
});
function toCamelCase(str) {
return str.split('-').map(function(word, i) {
return (i ? word[0].toUpperCase() + word.slice(1) : word);
}).join('');
}
var aliases = {},
newAliases = {};
Object.keys(opts.alias || {}).forEach(function (key) {
aliases[key] = [].concat(opts.alias[key]);
// For "--option-name", also set argv.optionName
aliases[key].concat(key).forEach(function (x) {
if (/-/.test(x)) {
var c = toCamelCase(x);
aliases[key].push(c);
newAliases[c] = true;
}
});
aliases[key].forEach(function (x) {
aliases[x] = [key].concat(aliases[key].filter(function (y) {
return x !== y;
}));
});
});
var defaults = opts['default'] || {};
Object.keys(defaults || {}).forEach(function (key) {
if (/-/.test(key) && !opts.alias[key]) {
var c = toCamelCase(key);
aliases[key] = aliases[key] || [];
// don't allow the same key to be added multiple times.
if (aliases[key].indexOf(c) === -1) {
aliases[key] = (aliases[key] || []).concat(c);
newAliases[c] = true;
}
}
(aliases[key] || []).forEach(function (alias) {
defaults[alias] = defaults[key];
});
});
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 setArg (key, val) {
if (/-/.test(key) && !(aliases[key] && aliases[key].length)) {
var c = toCamelCase(key);
aliases[key] = [c];
newAliases[c] = true;
}
var value = !flags.strings[key] && isNumber(val) ? Number(val) : val;
if (flags.counts[key] || flags.counts[aliases[key]]) {
value = function(orig) { return orig !== undefined ? orig + 1 : 0; };
}
if (flags.configs[key]) {
try {
var config = JSON.parse(fs.readFileSync(val, 'utf8'));
Object.keys(config).forEach(function (key) {
setArg(key, config[key]);
});
} catch (ex) {
console.error('Invalid JSON config file: ' + val);
throw ex;
}
}
setKey(argv, key.split('.'), value);
(aliases[key] || []).forEach(function (x) {
setKey(argv, x.split('.'), value);
});
var keys = [key].concat(aliases[key] || []);
for (var i = 0, l = keys.length; i < l; i++) {
if (flags.normalize[keys[i]]) {
keys.forEach(function(key) {
argv.__defineSetter__(key, function(v) {
val = path.normalize(v);
});
argv.__defineGetter__(key, function () {
return typeof val === 'string' ?
path.normalize(val) : val;
});
});
break;
}
}
}
for (var i = 0; i < args.length; i++) {
var arg = args[i];
if (arg.match(/^--.+=/)) {
// 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]*)$/);
setArg(m[1], m[2]);
}
else if (arg.match(/^--no-.+/)) {
var key = arg.match(/^--no-(.+)/)[1];
setArg(key, false);
}
else if (arg.match(/^--.+/)) {
var key = arg.match(/^--(.+)/)[1];
var next = args[i + 1];
if (next !== undefined && !next.match(/^-/)
&& !flags.bools[key]
&& (aliases[key] ? !flags.bools[aliases[key]] : true)) {
setArg(key, next);
i++;
}
else if (/^(true|false)$/.test(next)) {
setArg(key, next === 'true');
i++;
}
else {
setArg(key, true);
}
}
else if (arg.match(/^-[^-]+/)) {
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 (letters[j+1] && letters[j+1] === '=') {
setArg(letters[j], arg.slice(j+3));
broken = true;
break;
}
if (next === '-') {
setArg(letters[j], next)
continue;
}
if (/[A-Za-z]/.test(letters[j])
&& /-?\d+(\.\d*)?(e-?\d+)?$/.test(next)) {
setArg(letters[j], next);
broken = true;
break;
}
if (letters[j+1] && letters[j+1].match(/\W/)) {
setArg(letters[j], arg.slice(j+2));
broken = true;
break;
}
else {
setArg(letters[j], true);
}
}
var key = arg.slice(-1)[0];
if (!broken && key !== '-') {
if (args[i+1] && !/^(-|--)[^-]/.test(args[i+1])
&& !flags.bools[key]
&& (aliases[key] ? !flags.bools[aliases[key]] : true)) {
setArg(key, args[i+1]);
i++;
}
else if (args[i+1] && /true|false/.test(args[i+1])) {
setArg(key, args[i+1] === 'true');
i++;
}
else {
setArg(key, true);
}
}
}
else {
argv._.push(
flags.strings['_'] || !isNumber(arg) ? arg : Number(arg)
);
}
}
Object.keys(defaults).forEach(function (key) {
if (!hasKey(argv, key.split('.'))) {
setKey(argv, key.split('.'), defaults[key]);
(aliases[key] || []).forEach(function (x) {
setKey(argv, x.split('.'), defaults[key]);
});
}
});
Object.keys(flags.counts).forEach(function (key) {
setArg(key, defaults[key]);
});
notFlags.forEach(function(key) {
argv._.push(key);
});
return {
argv: argv,
aliases: aliases,
newAliases: newAliases
};
};
function hasKey (obj, keys) {
var o = obj;
keys.slice(0,-1).forEach(function (key) {
o = (o[key] || {});
});
var key = keys[keys.length - 1];
return key in o;
}
function setKey (obj, keys, value) {
var o = obj;
keys.slice(0,-1).forEach(function (key) {
if (o[key] === undefined) o[key] = {};
o = o[key];
});
var key = keys[keys.length - 1];
if (typeof value === 'function') {
o[key] = value(o[key]);
}
else if (o[key] === undefined || typeof o[key] === 'boolean') {
o[key] = value;
}
else if (Array.isArray(o[key])) {
o[key].push(value);
}
else {
o[key] = [ o[key], value ];
}
}
function isNumber (x) {
if (typeof x === 'number') return true;
if (/^0x[0-9a-f]+$/i.test(x)) return true;
return /^[-+]?(?:\d+(?:\.\d*)?|\.\d+)(e[-+]?\d+)?$/.test(x);
}
function longest (xs) {
return Math.max.apply(null, xs.map(function (x) { return x.length }));
}