cleaned up some mess and started the actual compressor

lib/parse.js

@@ -746,7 +746,7 @@ function parse($TEXT, exigent_mode) {
           case "punc":
             switch (S.token.value) {
               case "{":
-                return new AST_BlockStatement({ body: block_() });
+                return block_();
               case "[":
               case "(":
                 return simple_statement();
@@ -942,7 +942,7 @@ function parse($TEXT, exigent_mode) {
                 --S.in_function;
                 S.in_loop = loop;
                 S.labels = labels;
-                return new AST_BlockStatement({ body: a });
+                return a;
             })()
         });
     };
@@ -961,19 +961,25 @@ function parse($TEXT, exigent_mode) {
     };
 
     function block_() {
+        var start = S.token;
         expect("{");
         var a = [];
         while (!is("punc", "}")) {
             if (is("eof")) unexpected();
             a.push(statement());
         }
+        var end = S.token;
         next();
-        return a;
+        return new AST_BlockStatement({
+            start : start,
+            body  : a,
+            end   : end
+        });
     };
 
     var switch_block_ = embed_tokens(curry(in_loop, function(){
         expect("{");
-        var a = [], cur = null, branch = null;
+        var a = [], cur = null, branch = null, start = S.token;
         while (!is("punc", "}")) {
             if (is("eof")) unexpected();
             if (is("keyword", "case")) {
@@ -1002,16 +1008,17 @@ function parse($TEXT, exigent_mode) {
             }
         }
         if (branch) branch.end = prev();
+        var end = S.token;
         next();
-        return new AST_SwitchBlock({ body: a });
+        return new AST_SwitchBlock({
+            start : start,
+            body  : a,
+            end   : end
+        });
     }));
 
     function try_() {
-        var body = new AST_BlockStatement({
-            start : S.token,
-            body  : block_(),
-            end   : prev()
-        }), bcatch = null, bfinally = null;
+        var body = block_(), bcatch = null, bfinally = null;
         if (is("keyword", "catch")) {
             var start = S.token;
             next();
@@ -1021,11 +1028,7 @@ function parse($TEXT, exigent_mode) {
             bcatch = new AST_Catch({
                 start   : start,
                 argname : name,
-                body    : new AST_BlockStatement({
-                    start : S.token,
-                    body  : block_(),
-                    end   : prev()
-                }),
+                body    : block_(),
                 end     : prev()
             });
         }
@@ -1034,11 +1037,7 @@ function parse($TEXT, exigent_mode) {
             next();
             bfinally = new AST_Finally({
                 start : start,
-                body  : new AST_BlockStatement({
-                    start : S.token,
-                    body  : block_(),
-                    end   : prev()
-                }),
+                body  : block_(),
                 end   : prev()
             });
         }