skeleton of actions

lib/actions.js

@@ -0,0 +1,20 @@
+/*jslint vars: true, white: true, plusplus: true, todo: true */
+"use strict";
+
+var actionRE = /(?:^|\s)([\-+])([\-a-z]+)(?:{([^}]+)})?(?=\s|$)/g;
+var emptyActionsRE = /^\s*\{\s*\}\s*$/;
+
+function parseActions(actionsClause) {
+  var actions = [];
+  var remainder = actionsClause.replace(actionRE, function() {
+    actions.push(Array.prototype.slice.call(arguments, 1));
+    return "";
+  });
+  if (!emptyActionsRE.test(remainder)) {
+    throw new Error("Malformed actions clause:\n\n" + actionsClause);
+  }
+  return actions;
+}
+
+exports.parseActions = parseActions;
+

test/test-actions.js

@@ -0,0 +1,30 @@
+var aParser = require("./actions");
+
+exports["test parse valid"] = function(assert) {
+  var actions = aParser.parseActions([
+      "{",
+      "+block{nothing}",
+      "-handle-as-image",
+      "}"
+    ].join("\n"));
+  assert.ok(actions, "Actions were parsed");
+  assert.strictEqual(actions.length, 2, "Correct number of actions");
+};
+
+exports["test parse invalid"] = function(assert) {
+  assert.throws(function() {
+    aParser.parseActions("{ foo +block{nothing} -handle-as-image }");
+  }, "Extra garbage inside braces");
+  assert.throws(function() {
+    aParser.parseActions("foo{ +block{nothing} -handle-as-image }");
+  }, "Extra garbage outside braces");
+  assert.throws(function() {
+    aParser.parseActions("{ +block{nothing}} -handle-as-image }");
+  }, "Extra braces");
+  assert.throws(function() {
+    aParser.parseActions("{} +block{nothing} -handle-as-image {}");
+  }, "More extra braces");
+};
+
+require("sdk/test").run(exports);
+