Ensure consistent library version across different files.

https://code.google.com/p/esprima/issues/detail?id=470

esprima.js

@@ -3814,7 +3814,7 @@ parseStatement: true, parseSourceElement: true */
         return program;
     }
 
-    // Sync with package.json and component.json.
+    // Sync with *.json manifests.
     exports.version = '1.1.0-dev';
 
     exports.tokenize = tokenize;

package.json

@@ -42,7 +42,7 @@
         "generate-regex": "node tools/generate-identifier-regex.js",
 
         "test": "npm run-script lint && node test/run.js && npm run-script coverage && npm run-script complexity",
-        "lint": "node_modules/jslint/bin/jslint.js esprima.js",
+        "lint": "node tools/check-version.js && node_modules/jslint/bin/jslint.js esprima.js",
         "coverage": "npm run-script analyze-coverage && npm run-script check-coverage",
         "analyze-coverage": "node node_modules/istanbul/lib/cli.js cover test/runner.js",
         "check-coverage": "node node_modules/istanbul/lib/cli.js check-coverage --statement -8 --branch -19 --function 100",

tools/check-version.js

@@ -0,0 +1,57 @@
+#!/usr/bin/env node
+
+'use strict';
+
+var fs = require('fs');
+
+function findCanonicalVersion() {
+    var matcher, lines, version;
+
+    matcher = /exports\.version\s+=\s+\'([0-9\.\-a-zA-Z]+)\'/;
+    lines = fs.readFileSync('esprima.js', 'utf-8').split('\n');
+    lines.forEach(function (line) {
+        if (matcher.test(line)) {
+            version = matcher.exec(line)[1];
+        }
+    });
+
+    return version;
+}
+
+function ensureVersion(manifestFile, expectedVersion) {
+    var matcher, lines, version;
+
+    console.log('Checking', manifestFile, '...');
+    matcher = /"version"\s*\:\s*"([0-9\.\-a-zA-Z]+)"/;
+    lines = fs.readFileSync(manifestFile, 'utf-8').split('\n');
+    lines.forEach(function (line) {
+        if (matcher.test(line)) {
+            version = matcher.exec(line)[1];
+        }
+    });
+    if (expectedVersion !== version) {
+        console.log('ERROR: Wrong version for', manifestFile);
+        console.log('Expected:', expectedVersion);
+        console.log('  Actual:', version);
+        process.exit(1);
+    }
+}
+
+function checkVersion() {
+    var version;
+
+    console.log('Getting the canonical library version...');
+    version = findCanonicalVersion();
+    if (typeof version !== 'string') {
+        console.log('ERROR: Can not get version number!', typeof version);
+        process.exit(1);
+    }
+    console.log('Library version is', version);
+
+    ensureVersion('package.json', version);
+    ensureVersion('bower.json', version);
+    ensureVersion('component.json', version);
+}
+
+
+checkVersion();