expose format detection in builder

teohhanhui · Oct 30, 2014 · 9c4efde · 9c4efde
1 parent 52f22ba
commit 9c4efde
Showing 1 changed file with 53 additions and 44 deletions.
diff --git a/lib/build.js b/lib/build.js
@@ -251,6 +251,54 @@ var metaPartRegEx = /\/\*.*\*\/|\/\/[^\n]*|"[^"]+"\s*;?|'[^']+'\s*;?/g;
   // var commentRegEx = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg;
 var initialCommentRegEx = /^\s*(\/\*|\/\/)/;
 
+function detectFormat(source) {
+  // first checkout if we have format meta
+  var meta = source.match(metaRegEx);
+  var metadata = {};
+  if (meta) {
+    var metaParts = meta[0].match(metaPartRegEx);
+    for (var i = 0; i < metaParts.length; i++) {
+      var len = metaParts[i].length;
+
+      var firstChar = metaParts[i].substr(0, 1);
+      if (metaParts[i].substr(len - 1, 1) == ';')
+        len--;
+
+      if (firstChar != '"' && firstChar != "'")
+        continue;
+
+      var metaString = metaParts[i].substr(1, metaParts[i].length - 3);
+
+      var metaName = metaString.substr(0, metaString.indexOf(' '));
+      if (metaName) {
+        var metaValue = metaString.substr(metaName.length + 1, metaString.length - metaName.length - 1);
+
+        if (metadata[metaName] instanceof Array)
+          metadata[metaName].push(metaValue);
+        else
+          metadata[metaName] = metaValue;
+      }
+    }
+  }
+
+  if (metadata.format)
+    return { format: metadata.format, meta: true };
+
+  cjsExportsRegEx.lastIndex = 0;
+  cjsRequireRegEx.lastIndex = 0;
+  if (source.match(es6RegEx))
+    return { format: 'es6' };
+
+  if (source.match(amdRegEx))
+    return { format: 'amd' };
+
+  if (cjsRequireRegEx.exec(source) || cjsExportsRegEx.exec(source))
+    return { format: 'cjs' };
+
+  return { format: 'global' };
+}
+exports.detectFormat = detectFormat;
+
 /*
   options.format
   options.shim
@@ -370,54 +418,15 @@ exports.compileDir = function(dir, options) {
             if (shimmed)
               return;
 
-            // first checkout if we have format meta
-            var meta = source.match(metaRegEx);
-            var metadata = {};
-            if (meta) {
-              var metaParts = meta[0].match(metaPartRegEx);
-              for (var i = 0; i < metaParts.length; i++) {
-                var len = metaParts[i].length;
-
-                var firstChar = metaParts[i].substr(0, 1);
-                if (metaParts[i].substr(len - 1, 1) == ';')
-                  len--;
-
-                if (firstChar != '"' && firstChar != "'")
-                  continue;
-
-                var metaString = metaParts[i].substr(1, metaParts[i].length - 3);
+            var detected = detectFormat(source);
 
-                var metaName = metaString.substr(0, metaString.indexOf(' '));
-                if (metaName) {
-                  var metaValue = metaString.substr(metaName.length + 1, metaString.length - metaName.length - 1);
-
-                  if (metadata[metaName] instanceof Array)
-                    metadata[metaName].push(metaValue);
-                  else
-                    metadata[metaName] = metaValue;
-                }
-              }
-            }
-
-            if (metadata.format) {
-              format = metadata.format;
+            // don't rewrite meta
+            if (detected.meta) {
+              format = detected.format;
               return;
             }
 
-            cjsExportsRegEx.lastIndex = 0;
-            cjsRequireRegEx.lastIndex = 0;
-            if (source.match(es6RegEx)) {
-              format = format || 'es6';
-            }
-            else if (source.match(amdRegEx)) {
-              format = format || 'amd';
-            }
-            else if (cjsRequireRegEx.exec(source) || cjsExportsRegEx.exec(source)) {
-              format = format || 'cjs';
-            }
-            else {
-              format = format || 'global';
-            }
+            format = detected.format;
 
             changed = true;
             source = '"format ' + format + '";' + nl + source;