Restructured EvaluatorPreprocessor_read to be more natural.

src/core/evaluator.js

@@ -2104,21 +2104,7 @@ var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
       var args = null;
       while (true) {
         var obj = this.parser.getObj();
-        if (isEOF(obj)) {
+        if (isCmd(obj)) {
-          return false; // no more commands
-        }
-        if (!isCmd(obj)) {
-          // argument
-          if (obj !== null) {
-            if (!args) {
-              args = [];
-            }
-            args.push((obj instanceof Dict ? obj.getAll() : obj));
-            assert(args.length <= 33, 'Too many arguments');
-          }
-          continue;
-        }
-
           var cmd = obj.cmd;
           // Check that the command is valid
           var opSpec = OP_MAP[cmd];
@@ -2131,7 +2117,7 @@ var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
           var numArgs = opSpec.numArgs;
 
           if (!opSpec.variableArgs) {
-          // Some post script commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
+            // Postscript commands can be nested, e.g. /F2 /GS2 gs 5.711 Tf
             var argsLength = args !== null ? args.length : 0;
             if (argsLength !== numArgs) {
               var nonProcessedArgs = this.nonProcessedArgs;
@@ -2168,6 +2154,19 @@ var EvaluatorPreprocessor = (function EvaluatorPreprocessorClosure() {
           operation.fn = fn;
           operation.args = args;
           return true;
+        } else {
+          if (isEOF(obj)) {
+            return false; // no more commands
+          }
+          // argument
+          if (obj !== null) {
+            if (!args) {
+              args = [];
+            }
+            args.push((obj instanceof Dict ? obj.getAll() : obj));
+            assert(args.length <= 33, 'Too many arguments');
+          }
+        }
       }
     },