MACHIN

32/node_modules/jake/lib/parseargs.js

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