Fixed uglifying for asm-code. Added dist-task for building distribution-files

2026-08-12 21:21:42 +08:00 · 2015-03-14 15:43:46 +01:00
parent 24ceb3480c
commit 594aeb2fc0
9 changed files with 81 additions and 50 deletions
@@ -0,0 +1,56 @@
+/**
+ * Idea taken from https://github.com/fpirsch/twin-bcrypt/blob/master/Gearfile.js
+*/
+
+'use strict';
+
+var fs = require('fs');
+
+module.exports = function(grunt) {
+    grunt.registerTask('uglyasm', function() {
+        var code = fs.readFileSync('dist/quagga.js', 'utf-8'),
+            minifiedCode = fs.readFileSync('dist/quagga.min.js', 'utf-8'),
+            commentEnd = '/* @preserve ASM END */',
+            asmStartIdx = code.indexOf('/* @preserve ASM BEGIN */'),
+            asmEndIdx = code.indexOf(commentEnd),
+            asmCode = code.substring(asmStartIdx, asmEndIdx + commentEnd.length),
+            asmFunctionRegex = /function (\w+)\(\w+,\s*\w+,\s*\w+\)\s*\{\s*"use asm";/,
+            asmModule,
+            asmModuleName,
+            asmCodeMinified,
+            asmMinifiedModuleName;
+
+        asmCodeMinified = asmCode
+            .replace(/\s*\/\/.*/g, '') // remove single-line comments
+            .replace(/\s*\/\*[^]*?\*\//g, '') // remove multi-line comments
+            .replace(/\n\s*/g, '') // remove indentation
+            .replace(/ ([+=^|&]|>+|<+) /g, '$1') // remove spaces around operators
+            .replace(/[\r\n/]/g, ''); // remove new lines
+
+        grunt.log.debug(asmCodeMinified);
+
+        asmModule = asmCode.match(asmFunctionRegex);
+        if (!asmModule) {
+            grunt.log.error("No ASM module found");
+            return;
+        }
+
+        asmModuleName = asmModule[1];
+        grunt.log.debug(asmModuleName);
+
+        asmModule = minifiedCode.match(asmFunctionRegex);
+        if (!asmModule) {
+            grunt.log.error("No ASM module found in minified file");
+            return;
+        }
+
+        asmMinifiedModuleName = asmModule[1];
+        grunt.log.debug(asmMinifiedModuleName);
+
+        asmCodeMinified = asmCodeMinified.replace(asmModuleName, asmMinifiedModuleName);
+
+        minifiedCode = minifiedCode.replace(/\/\* @preserve ASM BEGIN \*\/[^]*?\/\* @preserve ASM END \*\//, asmCodeMinified);
+        fs.writeFileSync('dist/quagga.min.js', minifiedCode);
+        grunt.log.ok('dist/quagga.min.js written');
+    });
+};