checkpoint

lib/compress.js

@@ -64,6 +64,7 @@ function Compressor(options, false_by_default) {
         evaluate      : !false_by_default,
         booleans      : !false_by_default,
         dwloops       : !false_by_default,
+        hoist         : !false_by_default,
 
         warnings      : true
     });
@@ -140,7 +141,7 @@ function Compressor(options, false_by_default) {
             statements = eliminate_dead_code(statements, compressor);
         }
         if (compressor.option("sequences")) {
-            statements = sequencesize(statements);
+            statements = sequencesize(statements, compressor);
         }
         return statements;
     };
@@ -157,7 +158,7 @@ function Compressor(options, false_by_default) {
             }
             return a;
         }, []);
-    }
+    };
 
     function eliminate_dead_code(statements, compressor) {
         var has_quit = false;
@@ -194,7 +195,7 @@ function Compressor(options, false_by_default) {
             }
             return a;
         }, []);
-    }
+    };
 
     // XXX: this is destructive -- it modifies tree nodes.
     function sequencesize(statements) {
@@ -227,7 +228,7 @@ function Compressor(options, false_by_default) {
             return a;
         }, []);
         return statements;
-    }
+    };
 
     /* -----[ boolean/negation helpers ]----- */
 
@@ -479,6 +480,18 @@ function Compressor(options, false_by_default) {
         return self;
     });
 
+    SQUEEZE(AST_Scope, function(self, compressor){
+        self = self.clone();
+        self.hoist_declarations(compressor);
+        self.body = tighten_body(self.body, compressor);
+        return self;
+    });
+
+    AST_Scope.DEFMETHOD("hoist_declarations", function(compressor){
+        if (compressor.option("hoist")) {
+        }
+    });
+
     SQUEEZE(AST_EmptyStatement, function(self, compressor){
         return self;
     });
@@ -559,6 +572,7 @@ function Compressor(options, false_by_default) {
         // “has no side effects”; also it doesn't work for cases like
         // `x && true`, though it probably should.
         var cond = self.condition.evaluate(compressor);
+        self.condition = cond[0];
         if (cond.length == 2) {
             if (cond[1]) {
                 AST_Node.warn("Condition always true [{line},{col}]", self.condition.start);
@@ -568,6 +582,13 @@ function Compressor(options, false_by_default) {
                 return self.alternative || make_node(AST_EmptyStatement, self);
             }
         }
+        if (self.condition instanceof AST_UnaryPrefix
+            && self.condition.operator == "!") {
+            self.condition = self.condition.expression;
+            var tmp = self.body;
+            self.body = self.alternative || make_node(AST_EmptyStatement, self);
+            self.alternative = tmp;
+        }
         if (self.body instanceof AST_SimpleStatement
             && self.alternative instanceof AST_SimpleStatement) {
             return make_node(AST_SimpleStatement, self, {
@@ -578,7 +599,9 @@ function Compressor(options, false_by_default) {
                 }).optimize(compressor)
             });
         }
-        if ((!self.alternative || self.alternative instanceof AST_EmptyStatement) && self.body instanceof AST_SimpleStatement) {
+        if ((!self.alternative
+             || self.alternative instanceof AST_EmptyStatement)
+            && self.body instanceof AST_SimpleStatement) {
             return make_node(AST_SimpleStatement, self, {
                 body: make_node(AST_Binary, self, {
                     operator : "&&",
@@ -589,7 +612,7 @@ function Compressor(options, false_by_default) {
         }
         if (self.body instanceof AST_EmptyStatement
             && self.alternative
-            && !(self.alternative instanceof AST_EmptyStatement)) {
+            && self.alternative instanceof AST_SimpleStatement) {
             return make_node(AST_SimpleStatement, self, {
                 body: make_node(AST_Binary, self, {
                     operator : "||",
@@ -656,6 +679,7 @@ function Compressor(options, false_by_default) {
 
     SQUEEZE(AST_Lambda, function(self, compressor){
         self = self.clone();
+        self.hoist_declarations(compressor);
         if (self.name) self.name = self.name.squeeze(compressor);
         self.argnames = do_list(self.argnames, compressor);
         self.body = self.body.squeeze(compressor);

lib/scope.js

@@ -165,6 +165,7 @@ AST_Toplevel.DEFMETHOD("scope_warnings", function(options){
         unreferenced     : true,
         assign_to_global : true,
         func_arguments   : true,
+        nested_defuns    : true,
         eval             : true
     });
     var tw = new TreeWalker(function(node){
@@ -225,6 +226,17 @@ AST_Toplevel.DEFMETHOD("scope_warnings", function(options){
                 col: node.start.col
             });
         }
+        if (options.nested_defuns
+            && node instanceof AST_Defun
+            && !(tw.parent() instanceof AST_Scope
+                 || (tw.parent() instanceof AST_BlockStatement
+                     && tw.parent(1) instanceof AST_Scope))) {
+            AST_Node.warn("Function {name} declared in nested statement [{line},{col}]", {
+                name: node.name.name,
+                line: node.start.line,
+                col: node.start.col
+            });
+        }
     });
     this.walk(tw);
 });

lib/utils.js

@@ -145,9 +145,8 @@ var MAP = (function(){
 // feeling it works well in general for many scripts (well, better
 // than alphabetical order).  It would be nice if we could adapt it to
 // the currently running script.
-// var BASE54_DIGITS = "etnrisouaflchpdvmgybwESxTNCkLAOM_DPHBjFIqRUzWXV$JKQGYZ0516372984";
+var BASE54_DIGITS = "etnrisouaflchpdvmgybwESxTNCkLAOM_DPHBjFIqRUzWXV$JKQGYZ0516372984";
-
+//var BASE54_DIGITS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
-var BASE54_DIGITS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
 
 function base54(num) {
     var ret = "", base = 54;

tmp/test-node.js

@@ -22,7 +22,7 @@ time_it("scope", function(){
     ast.figure_out_scope();
 });
 
-// ast.scope_warnings();
+ast.scope_warnings();
 
 time_it("mangle", function(){
     ast.mangle_names();