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adaptive base54 digits depending on char frequency (WIP)

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This commit is contained in:
Mihai Bazon
2012-09-10 18:25:52 +03:00
parent a41e6cfabb
commit 6b9aeb5325
4 changed files with 138 additions and 71 deletions
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115
lib/scope.js
View File

@@ -296,14 +296,19 @@ AST_Scope.DEFMETHOD("next_mangled", function(){
}
});
AST_SymbolDeclaration.DEFMETHOD("unmangleable", function(){
return this.global || this.scope.uses_eval || this.scope.uses_with;
});
AST_Label.DEFMETHOD("unmangleable", function(){
return false;
});
AST_SymbolDeclaration.DEFMETHOD("mangle", function(){
if (this.uniq) {
if (this.uniq && this.uniq !== this) {
this.uniq.mangle();
}
else if (!(this.global
|| this.scope.uses_eval
|| this.scope.uses_with
|| this.mangled_name)) {
else if (!(this.mangled_name || this.unmangleable())) {
this.mangled_name = this.scope.next_mangled();
}
});
@@ -354,3 +359,103 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(){
});
this.walk(tw);
});
AST_Toplevel.DEFMETHOD("compute_char_frequency", function(){
var tw = new TreeWalker(function(node){
if (node instanceof AST_Constant)
base54.consider(node.print_to_string());
else if (node instanceof AST_Debugger)
base54.consider("debugger");
else if (node instanceof AST_Directive)
base54.consider(node.value);
else if (node instanceof AST_While)
base54.consider("while");
else if (node instanceof AST_Do)
base54.consider("dowhile");
else if (node instanceof AST_If) {
base54.consider("if");
if (node.alternative) base54.consider("else");
}
else if (node instanceof AST_Var)
base54.consider("var");
else if (node instanceof AST_Const)
base54.consider("const");
else if (node instanceof AST_Lambda)
base54.consider("function");
else if (node instanceof AST_For)
base54.consider("for");
else if (node instanceof AST_ForIn)
base54.consider("forin");
else if (node instanceof AST_Switch)
base54.consider("switch");
else if (node instanceof AST_Case)
base54.consider("case");
else if (node instanceof AST_Default)
base54.consider("default");
else if (node instanceof AST_With)
base54.consider("with");
else if (node instanceof AST_ObjectSetter)
base54.consider("set" + node.key);
else if (node instanceof AST_ObjectGetter)
base54.consider("get" + node.key);
else if (node instanceof AST_ObjectKeyVal)
base54.consider(node.key);
else if (node instanceof AST_New)
base54.consider("new");
else if (node instanceof AST_This)
base54.consider("this");
else if (node instanceof AST_Try)
base54.consider("try");
else if (node instanceof AST_Catch)
base54.consider("catch");
else if (node instanceof AST_Finally)
base54.consider("finally");
else if (node instanceof AST_SymbolDeclaration && node.unmangleable())
base54.consider(node.name);
else if (node instanceof AST_SymbolRef && !node.uniq && !(node instanceof AST_LabelRef))
base54.consider(node.name);
else if (node instanceof AST_Unary || node instanceof AST_Binary)
base54.consider(node.operator);
else if (node instanceof AST_Dot)
base54.consider(node.property);
});
this.walk(tw);
base54.sort();
});
var base54 = (function() {
var string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
var chars, frequency;
function reset() {
frequency = {};
chars = string.split("");
chars.map(function(ch){ frequency[ch] = 0 });
}
base54.consider = function(str){
for (var i = str.length; --i >= 0;) {
var ch = str.charAt(i);
if (string.indexOf(ch))
++frequency[ch];
}
};
base54.sort = function() {
chars.sort(function(a, b){
if (is_digit(a) && !is_digit(b)) return 1;
if (is_digit(b) && !is_digit(a)) return -1;
return frequency[b] - frequency[a];
});
};
base54.reset = reset;
reset();
base54.get = function(){ return chars };
function base54(num) {
var ret = "", base = 54;
do {
ret += chars[num % base];
num = Math.floor(num / base);
base = 64;
} while (num > 0);
return ret;
};
return base54;
})();

17
lib/utils.js
View File

@@ -141,23 +141,6 @@ var MAP = (function(){
return MAP;
})();
// XXX: currently this is optimized for jQuery, though I have the
// 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$JKQGYZ0516372984";
//var BASE54_DIGITS = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
function base54(num) {
var ret = "", base = 54;
do {
ret += BASE54_DIGITS.charAt(num % base);
num = Math.floor(num / base);
base = 64;
} while (num > 0);
return ret;
};
function push_uniq(array, el) {
if (array.indexOf(el) < 0)
array.push(el);