135 lines
3.7 KiB
JavaScript
135 lines
3.7 KiB
JavaScript
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/*
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* Jake JavaScript build tool
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* Copyright 2112 Matthew Eernisse (mde@fleegix.org)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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let parseargs = {};
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let isOpt = function (arg) { return arg.indexOf('-') === 0 };
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let removeOptPrefix = function (opt) { return opt.replace(/^--/, '').replace(/^-/, '') };
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/**
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* @constructor
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* Parses a list of command-line args into a key/value object of
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* options and an array of positional commands.
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* @ param {Array} opts A list of options in the following format:
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* [{full: 'foo', abbr: 'f'}, {full: 'bar', abbr: 'b'}]]
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*/
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parseargs.Parser = function (opts) {
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// A key/value object of matching options parsed out of the args
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this.opts = {};
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this.taskNames = null;
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this.envVars = null;
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// Data structures used for parsing
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this.reg = opts;
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this.shortOpts = {};
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this.longOpts = {};
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let self = this;
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[].forEach.call(opts, function (item) {
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self.shortOpts[item.abbr] = item;
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self.longOpts[item.full] = item;
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});
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};
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parseargs.Parser.prototype = new function () {
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let _trueOrNextVal = function (argParts, args) {
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if (argParts[1]) {
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return argParts[1];
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}
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else {
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return (!args[0] || isOpt(args[0])) ?
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true : args.shift();
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}
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};
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/**
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* Parses an array of arguments into options and positional commands
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* @param {Array} args The command-line args to parse
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*/
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this.parse = function (args) {
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let cmds = [];
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let cmd;
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let envVars = {};
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let opts = {};
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let arg;
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let argItem;
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let argParts;
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let cmdItems;
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let taskNames = [];
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let preempt;
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while (args.length) {
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arg = args.shift();
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if (isOpt(arg)) {
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arg = removeOptPrefix(arg);
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argParts = arg.split('=');
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argItem = this.longOpts[argParts[0]] || this.shortOpts[argParts[0]];
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if (argItem) {
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// First-encountered preemptive opt takes precedence -- no further opts
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// or possibility of ambiguity, so just look for a value, or set to
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// true and then bail
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if (argItem.preempts) {
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opts[argItem.full] = _trueOrNextVal(argParts, args);
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preempt = true;
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break;
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}
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// If the opt requires a value, see if we can get a value from the
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// next arg, or infer true from no-arg -- if it's followed by another
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// opt, throw an error
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if (argItem.expectValue || argItem.allowValue) {
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opts[argItem.full] = _trueOrNextVal(argParts, args);
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if (argItem.expectValue && !opts[argItem.full]) {
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throw new Error(argItem.full + ' option expects a value.');
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}
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}
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else {
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opts[argItem.full] = true;
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}
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}
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}
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else {
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cmds.unshift(arg);
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}
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}
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if (!preempt) {
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// Parse out any env-vars and task-name
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while ((cmd = cmds.pop())) {
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cmdItems = cmd.split('=');
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if (cmdItems.length > 1) {
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envVars[cmdItems[0]] = cmdItems[1];
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}
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else {
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taskNames.push(cmd);
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}
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}
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}
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return {
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opts: opts,
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envVars: envVars,
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taskNames: taskNames
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};
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};
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};
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module.exports = parseargs;
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