peg.generate: Implement { format: "global" }

README.md

@@ -144,9 +144,10 @@ object to `peg.generate`. The following options are supported:
     `"umd"` (default: `{}`)
   * `exportVar` — name of a global variable into which the parser object is
     assigned to when no module loader is detected; valid only when `format` is
-    set to `"umd"` (default: `null`)
-  * `format` — format of the genreated parser (`"amd"`, `"bare"`, `"node"`, or
-    `"umd"`); valid only when `output` is set to `"source"` (default: `"bare"`)
+    set to `"global"` or `"umd"` (default: `null`)
+  * `format` — format of the genreated parser (`"amd"`, `"bare"`, `"global"`,
+    `"node"`, or `"umd"`); valid only when `output` is set to `"source"`
+    (default: `"bare"`)
   * `optimize`— selects between optimizing the generated parser for parsing
     speed (`"speed"`) or code size (`"size"`) (default: `"speed"`)
   * `output` — if set to `"parser"`, the method will return generated parser

lib/compiler/passes/generate-js.js

@@ -1326,6 +1326,20 @@ function generateJS(ast, options) {
         ].join('\n');
       },
 
+      global: function() {
+        return [
+          generateGeneratedByComment(),
+          '(function(root) {',
+          '  "use strict";',
+          '',
+             indent2(toplevelCode),
+          '',
+             indent2('root.' + options.exportVar + ' = ' + generateParserObject() + ';'),
+          '})(this);',
+          ''
+        ].join('\n');
+      },
+
       umd: function() {
         var parts          = [],
             dependencyIds  = objects.values(options.dependencies),