From f633f697c9bf858d0428957c140f388dac7e69f6 Mon Sep 17 00:00:00 2001
From: David Majda <david@majda.cz>
Date: Thu, 14 Jul 2016 14:44:50 +0200
Subject: [PATCH] peg.generate: Implement { format: "node" }

---
 README.md                          |  7 +++---
 lib/compiler/passes/generate-js.js | 35 ++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 06d78a7..c41a223 100644
--- a/README.md
+++ b/README.md
@@ -140,12 +140,13 @@ object to `peg.generate`. The following options are supported:
     `false`)
   * `dependencies` — parser dependencies, the value is an object which maps
     variables used to access the dependencies in the parser to module IDs used
-    to load them; valid only when `format` is set to `"umd"` (default: `{}`)
+    to load them; valid only when `format` is set to `"node"` or `"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 (`"bare"` or `"umd"`); valid only
-    when `output` is set to `"source"` (default: `"bare"`)
+  * `format` — format of the genreated parser (`"bare"`, `"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
diff --git a/lib/compiler/passes/generate-js.js b/lib/compiler/passes/generate-js.js
index 27247b4..efea66c 100644
--- a/lib/compiler/passes/generate-js.js
+++ b/lib/compiler/passes/generate-js.js
@@ -1267,6 +1267,41 @@ function generateJS(ast, options) {
         ].join('\n');
       },
 
+      node: function() {
+        var parts          = [],
+            dependencyVars = objects.keys(options.dependencies),
+            requires       = arrays.map(
+              dependencyVars,
+              function(variable) {
+                return variable
+                  + ' = require("'
+                  + js.stringEscape(options.dependencies[variable])
+                  + '")';
+              }
+            );
+
+        parts.push([
+          generateGeneratedByComment(),
+          '',
+          '"use strict";',
+          ''
+        ].join('\n'));
+
+        if (requires.length > 0) {
+          parts.push('var ' + requires.join(', ') + ';');
+          parts.push('');
+        }
+
+        parts.push([
+          toplevelCode,
+          '',
+          'module.exports = ' + generateParserObject() + ';',
+          ''
+        ].join('\n'));
+
+        return parts.join('\n');
+      },
+
       umd: function() {
         var parts          = [],
             dependencyIds  = objects.values(options.dependencies),