From 95abd42c953d42f5b35dcdde1f03528f825fa517 Mon Sep 17 00:00:00 2001
From: Futago-za Ryuu <futagoza.ryuu@gmail.com>
Date: Fri, 14 Sep 2018 02:42:46 +0100
Subject: [PATCH] Ensure VERSION is consistent

The PEG.js version is exported and also written into the generated parser. In both these instances the version is a separate string, which means every time the version is bumped, it has to be changed in 3 places. This commit makes it slightly less of a maintenance burden.
---
 packages/pegjs/lib/compiler/passes/generate-js.js | 3 ++-
 packages/pegjs/lib/parser.js                      | 2 +-
 packages/pegjs/lib/peg.js                         | 3 ++-
 packages/pegjs/lib/version.js                     | 8 ++++++++
 packages/pegjs/typings/modules.d.ts               | 6 ++++++
 5 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 packages/pegjs/lib/version.js

diff --git a/packages/pegjs/lib/compiler/passes/generate-js.js b/packages/pegjs/lib/compiler/passes/generate-js.js
index be5efd1..e84f6e3 100644
--- a/packages/pegjs/lib/compiler/passes/generate-js.js
+++ b/packages/pegjs/lib/compiler/passes/generate-js.js
@@ -3,6 +3,7 @@
 "use strict";
 
 const util = require( "../../util" );
+const VERSION = require( "../../version" );
 
 // Generates parser JavaScript code.
 function generateJS( ast, session, options ) {
@@ -1593,7 +1594,7 @@ function generateJS( ast, session, options ) {
 
         function generateHeaderComment() {
 
-            let comment = "// Generated by PEG.js v0.11.0-dev, https://pegjs.org/";
+            let comment = `// Generated by PEG.js ${ VERSION }, https://pegjs.org/`;
             const header = options.header;
 
             if ( typeof header === "string" ) {
diff --git a/packages/pegjs/lib/parser.js b/packages/pegjs/lib/parser.js
index e133f6a..55f6ad8 100644
--- a/packages/pegjs/lib/parser.js
+++ b/packages/pegjs/lib/parser.js
@@ -1,4 +1,4 @@
-// Generated by PEG.js v0.11.0-dev, https://pegjs.org/
+// Generated by PEG.js 0.11.0-dev, https://pegjs.org/
 
 /* eslint-disable */
 
diff --git a/packages/pegjs/lib/peg.js b/packages/pegjs/lib/peg.js
index 027b424..53bf8ba 100644
--- a/packages/pegjs/lib/peg.js
+++ b/packages/pegjs/lib/peg.js
@@ -5,10 +5,11 @@ const ast = require( "./ast" );
 const compiler = require( "./compiler" );
 const parser = require( "./parser" );
 const util = require( "./util" );
+const VERSION = require( "./version" );
 
 const peg = {
     // PEG.js version (uses semantic versioning).
-    VERSION: "0.11.0-dev",
+    VERSION: VERSION,
 
     GrammarError: GrammarError,
     ast: ast,
diff --git a/packages/pegjs/lib/version.js b/packages/pegjs/lib/version.js
new file mode 100644
index 0000000..dd60b25
--- /dev/null
+++ b/packages/pegjs/lib/version.js
@@ -0,0 +1,8 @@
+"use strict";
+
+/**
+ * PEG.js version (uses semantic versioning).
+ */
+const VERSION = "0.11.0-dev";
+
+module.exports = VERSION;
diff --git a/packages/pegjs/typings/modules.d.ts b/packages/pegjs/typings/modules.d.ts
index 9204fce..0ed3eaa 100644
--- a/packages/pegjs/typings/modules.d.ts
+++ b/packages/pegjs/typings/modules.d.ts
@@ -6,6 +6,12 @@ declare module "pegjs" {
 
 }
 
+declare module "pegjs/lib/version" {
+
+    export default peg.VERSION;
+
+}
+
 declare module "pegjs/lib/grammar-error" {
 
     export default peg.GrammarError;