private void manMung() { // 手动混淆，即由用户输入混淆变量
JTable table = AnalyseWarnPanel.table;
Set<ScriptOrFnScope> scopes = scopeSymbolMaping.keySet();
Iterator<ScriptOrFnScope> scopesSetIt = scopes.iterator();
int i = 0;
while (scopesSetIt.hasNext()) {
ScriptOrFnScope tmpScope = scopesSetIt.next();
List<String> symbolList = scopeSymbolMaping.get(tmpScope);
Iterator<String> symbolListIt = symbolList.iterator();
while (symbolListIt.hasNext()) {
String symbol = symbolListIt.next();
JavaScriptIdentifier identifier = tmpScope.getIdentifier(symbol);
String mungedValue = table.getValueAt(i, 1).toString().trim();
if (identifier.isMarkedForMunging() && !mungedValue.equals("null")) {
identifier.setMungedValue(mungedValue);
}
i++;
}
}
}
private void parseScope(ScriptOrFnScope scope) {
String symbol;
JavaScriptToken token;
JavaScriptIdentifier identifier;
int length = tokens.size();
enterScope(scope); // 进入范围(将scope压入栈scopes中)
while (offset < length) { // 在此函数调用前已设置为0
token = consumeToken(); // 消费tokens,offset自增
switch (token.getType()) {
case Token.VAR: // 注意后面没有break;
if (mode == BUILDING_SYMBOL_TREE) {
scope.incrementVarCount(); // 当前范围内的var数量加1
}
/* FALLSTHROUGH(falls through) 失败 */
case Token.CONST:
// The var keyword is followed by at least one symbol name.
// If several symbols follow, they are comma(逗号) separated.
for (; ; ) {
token = consumeToken();
assert token.getType() == Token.NAME;
// 判断关键字var、const后的变量是否已经定义，未定义则定义，已定义则输出警告
if (mode == BUILDING_SYMBOL_TREE) {
symbol = token.getValue();
if (scope.getIdentifier(symbol) == null) {
scope.declareIdentifier(symbol, true); // 声明标识符
} else {
warn("变量" + symbol + "已经在相同的作用域中声明", true);
}
}
token = getToken(0); // offset不自增,token.getValue()的值一般为'='或';'
assert token.getType() == Token.SEMI
|| token.getType() == Token.ASSIGN
|| token.getType() == Token.COMMA
|| token.getType() == Token.IN;
if (token.getType() == Token.IN) {
break;
} else {
parseExpression(); // 解释表达式（例如解释var a = 'u';或var a;）
token = getToken(-1); // 得到的是';'
if (token.getType() == Token.SEMI) { // 变量声明完成
break;
}
}
}
break;
case Token.FUNCTION:
parseFunctionDeclaration();
break;
case Token.LC:
braceNesting++;
break;
case Token.RC:
braceNesting--;
assert braceNesting >= scope.getBraceNesting();
if (braceNesting == scope.getBraceNesting()) { // 说明要离开当前作用域了
leaveCurrentScope(); // 离开当前作用域
return;
}
break;
case Token.WITH:
if (mode == BUILDING_SYMBOL_TREE) {
// Inside a 'with' block, it is impossible to figure out
// statically whether a symbol is a local variable or an
// object member. As a consequence, the only thing we can
// do is turn the obfuscation off for the highest scope
// containing the 'with' block.
protectScopeFromObfuscation(scope);
warn("不推荐使用with关键字。" + (munge ? " 使用with会降低压缩水平" : ""), true);
}
break;
case Token.CATCH:
parseCatch();
break;
case Token.CONDCOMMENT:
if (mode == BUILDING_SYMBOL_TREE) {
protectScopeFromObfuscation(scope);
warn("不推荐使用JScript条件注释。" + (munge ? "使用JScript条件解释会降低压缩水平。" : ""), true);
}
break;
case Token.NAME:
symbol = token.getValue();
if (mode == BUILDING_SYMBOL_TREE) {
if (symbol.equals("eval")) {
protectScopeFromObfuscation(scope);
warn("不推荐使用'eval'关键字。" + (munge ? "使用'eval'会降低压缩水平！" : ""), true);
}
} else if (mode == CHECKING_SYMBOL_TREE) {
if ((offset < 2 || getToken(-2).getType() != Token.DOT)
&& getToken(0).getType() != Token.OBJECTLIT) {
identifier = getIdentifier(symbol, scope);
if (identifier == null) {
if (symbol.length() <= 3 && !builtin.contains(symbol)) {
// Here, we found an undeclared and
// un-namespaced symbol that is
// 3 characters or less in length. Declare it in
// the global scope.
// We don't need to declare longer symbols since
// they won't cause
// any conflict with other munged symbols.
globalScope.declareIdentifier(symbol, false);
// warn("Found an undeclared symbol: " + symbol,
// true);
}
} else {
identifier.incrementRefcount();
}
}
}
break;
}
}
}
private void parseExpression() {
// Parse the expression until we encounter a comma or a semi-colon
// in the same brace nesting, bracket nesting（方括号嵌套） and paren nesting.
// Parse functions if any...
String symbol;
JavaScriptToken token;
ScriptOrFnScope currentScope;
JavaScriptIdentifier identifier;
int expressionBraceNesting = braceNesting; // 花括号嵌套
int bracketNesting = 0; // 方括号嵌套
int parensNesting = 0; //
int length = tokens.size();
while (offset < length) {
token = consumeToken();
currentScope = getCurrentScope(); // return scopes.peek();
switch (token.getType()) {
case Token.SEMI:
case Token.COMMA:
if (braceNesting == expressionBraceNesting && bracketNesting == 0 && parensNesting == 0) {
return;
}
break;
case Token.FUNCTION:
parseFunctionDeclaration();
break;
case Token.LC:
braceNesting++;
break;
case Token.RC:
braceNesting--;
assert braceNesting >= expressionBraceNesting;
break;
case Token.LB:
bracketNesting++;
break;
case Token.RB:
bracketNesting--;
break;
case Token.LP:
parensNesting++;
break;
case Token.RP:
parensNesting--;
break;
case Token.CONDCOMMENT:
if (mode == BUILDING_SYMBOL_TREE) {
protectScopeFromObfuscation(currentScope);
warn("不推荐使用JScript条件注释。" + (munge ? "使用JScript条件注释会降低压缩水平！" : ""), true);
}
break;
case Token.NAME:
symbol = token.getValue();
if (mode == BUILDING_SYMBOL_TREE) {
if (symbol.equals("eval")) {
protectScopeFromObfuscation(currentScope);
warn("不推荐使用'eval'关键字。" + (munge ? "使用'eval'会降低压缩水平！" : ""), true);
}
} else if (mode == CHECKING_SYMBOL_TREE) {
if ((offset < 2
|| (getToken(-2).getType() != Token.DOT
&& getToken(-2).getType() != Token.GET
&& getToken(-2).getType() != Token.SET))
&& getToken(0).getType() != Token.OBJECTLIT) {
identifier = getIdentifier(symbol, currentScope);
if (identifier == null) {
if (symbol.length() <= 3 && !builtin.contains(symbol)) {
// Here, we found an undeclared and
// un-namespaced symbol that is
// 3 characters or less in length. Declare it in
// the global scope.
// We don't need to declare longer symbols since
// they won't cause
// any conflict with other munged symbols.
globalScope.declareIdentifier(symbol, false);
// I removed the warning since was only being
// done when
// for identifiers 3 chars or less, and was just
// causing
// noise for people who happen to rely on an
// externally
// declared variable that happen to be that
// short. We either
// should always warn or never warn -- the fact
// that we
// declare the short symbols in the global space
// doesn't
// change anything.
// warn("Found an undeclared symbol: " + symbol,
// true);
}
} else {
identifier.incrementRefcount();
}
}
}
break;
}
}
}
private static boolean isValidIdentifier(String s) {
Matcher m = SIMPLE_IDENTIFIER_NAME_PATTERN.matcher(s);
return (m.matches() && !reserved.contains(s));
}
static {
// This list contains all the 3 characters or less built-in global
// symbols available in a browser. Please add to this list if you
// see anything missing.
builtin.add("NaN");
builtin.add("top");
ones = new ArrayList<String>();
for (char c = 'a'; c <= 'z'; c++) ones.add(Character.toString(c));
for (char c = 'A'; c <= 'Z'; c++) ones.add(Character.toString(c));
twos = new ArrayList<String>();
for (int i = 0; i < ones.size(); i++) {
String one = ones.get(i);
for (char c = 'a'; c <= 'z'; c++) twos.add(one + Character.toString(c));
for (char c = 'A'; c <= 'Z'; c++) twos.add(one + Character.toString(c));
for (char c = '0'; c <= '9'; c++) twos.add(one + Character.toString(c));
}
// Remove two-letter JavaScript reserved words and built-in globals...
twos.remove("as");
twos.remove("is");
twos.remove("do");
twos.remove("if");
twos.remove("in");
twos.removeAll(builtin);
threes = new ArrayList<String>();
for (int i = 0; i < twos.size(); i++) {
String two = twos.get(i);
for (char c = 'a'; c <= 'z'; c++) threes.add(two + Character.toString(c));
for (char c = 'A'; c <= 'Z'; c++) threes.add(two + Character.toString(c));
for (char c = '0'; c <= '9'; c++) threes.add(two + Character.toString(c));
}
// Remove three-letter JavaScript reserved words and built-in globals...
threes.remove("for");
threes.remove("int");
threes.remove("new");
threes.remove("try");
threes.remove("use");
threes.remove("var");
threes.removeAll(builtin);
// That's up to ((26+26)*(1+(26+26+10)))*(1+(26+26+10))-8
// (206,380 symbols per scope)
// The following list comes from
// org/mozilla/javascript/Decompiler.java...
// 注意：此处并为认为地设定键与值的acsii码相等，比如Token.ASSIGN是89,而'='为61
literals.put(new Integer(Token.GET), "get ");
literals.put(new Integer(Token.SET), "set ");
literals.put(new Integer(Token.TRUE), "true");
literals.put(new Integer(Token.FALSE), "false");
literals.put(new Integer(Token.NULL), "null");
literals.put(new Integer(Token.THIS), "this");
literals.put(new Integer(Token.FUNCTION), "function");
literals.put(new Integer(Token.COMMA), ",");
literals.put(new Integer(Token.LC), "{");
literals.put(new Integer(Token.RC), "}");
literals.put(new Integer(Token.LP), "(");
literals.put(new Integer(Token.RP), ")");
literals.put(new Integer(Token.LB), "[");
literals.put(new Integer(Token.RB), "]");
literals.put(new Integer(Token.DOT), ".");
literals.put(new Integer(Token.NEW), "new ");
literals.put(new Integer(Token.DELPROP), "delete ");
literals.put(new Integer(Token.IF), "if");
literals.put(new Integer(Token.ELSE), "else");
literals.put(new Integer(Token.FOR), "for");
literals.put(new Integer(Token.IN), " in ");
literals.put(new Integer(Token.WITH), "with");
literals.put(new Integer(Token.WHILE), "while");
literals.put(new Integer(Token.DO), "do");
literals.put(new Integer(Token.TRY), "try");
literals.put(new Integer(Token.CATCH), "catch");
literals.put(new Integer(Token.FINALLY), "finally");
literals.put(new Integer(Token.THROW), "throw");
literals.put(new Integer(Token.SWITCH), "switch");
literals.put(new Integer(Token.BREAK), "break");
literals.put(new Integer(Token.CONTINUE), "continue");
literals.put(new Integer(Token.CASE), "case");
literals.put(new Integer(Token.DEFAULT), "default");
literals.put(new Integer(Token.RETURN), "return");
literals.put(new Integer(Token.VAR), "var ");
literals.put(new Integer(Token.SEMI), ";");
literals.put(new Integer(Token.ASSIGN), "=");
literals.put(new Integer(Token.ASSIGN_ADD), "+=");
literals.put(new Integer(Token.ASSIGN_SUB), "-=");
literals.put(new Integer(Token.ASSIGN_MUL), "*=");
literals.put(new Integer(Token.ASSIGN_DIV), "/=");
literals.put(new Integer(Token.ASSIGN_MOD), "%=");
literals.put(new Integer(Token.ASSIGN_BITOR), "|=");
literals.put(new Integer(Token.ASSIGN_BITXOR), "^=");
literals.put(new Integer(Token.ASSIGN_BITAND), "&=");
literals.put(new Integer(Token.ASSIGN_LSH), "<<=");
literals.put(new Integer(Token.ASSIGN_RSH), ">>=");
literals.put(new Integer(Token.ASSIGN_URSH), ">>>=");
literals.put(new Integer(Token.HOOK), "?");
literals.put(new Integer(Token.OBJECTLIT), ":");
literals.put(new Integer(Token.COLON), ":");
literals.put(new Integer(Token.OR), "||");
literals.put(new Integer(Token.AND), "&&");
literals.put(new Integer(Token.BITOR), "|");
literals.put(new Integer(Token.BITXOR), "^");
literals.put(new Integer(Token.BITAND), "&");
literals.put(new Integer(Token.SHEQ), "===");
literals.put(new Integer(Token.SHNE), "!==");
literals.put(new Integer(Token.EQ), "==");
literals.put(new Integer(Token.NE), "!=");
literals.put(new Integer(Token.LE), "<=");
literals.put(new Integer(Token.LT), "<");
literals.put(new Integer(Token.GE), ">=");
literals.put(new Integer(Token.GT), ">");
literals.put(new Integer(Token.INSTANCEOF), " instanceof ");
literals.put(new Integer(Token.LSH), "<<");
literals.put(new Integer(Token.RSH), ">>");
literals.put(new Integer(Token.URSH), ">>>");
literals.put(new Integer(Token.TYPEOF), "typeof");
literals.put(new Integer(Token.VOID), "void ");
literals.put(new Integer(Token.CONST), "const ");
literals.put(new Integer(Token.NOT), "!");
literals.put(new Integer(Token.BITNOT), "~");
literals.put(new Integer(Token.POS), "+");
literals.put(new Integer(Token.NEG), "-");
literals.put(new Integer(Token.INC), "++");
literals.put(new Integer(Token.DEC), "--");
literals.put(new Integer(Token.ADD), "+");
literals.put(new Integer(Token.SUB), "-");
literals.put(new Integer(Token.MUL), "*");
literals.put(new Integer(Token.DIV), "/");
literals.put(new Integer(Token.MOD), "%");
literals.put(new Integer(Token.COLONCOLON), "::");
literals.put(new Integer(Token.DOTDOT), "..");
literals.put(new Integer(Token.DOTQUERY), ".(");
literals.put(new Integer(Token.XMLATTR), "@");
literals.put(new Integer(Token.LET), "let ");
literals.put(new Integer(Token.YIELD), "yield ");
// See
// http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Reserved_Words
// JavaScript 1.5 reserved words
reserved.add("break");
reserved.add("case");
reserved.add("catch");
reserved.add("continue");
reserved.add("default");
reserved.add("delete");
reserved.add("do");
reserved.add("else");
reserved.add("finally");
reserved.add("for");
reserved.add("function");
reserved.add("if");
reserved.add("in");
reserved.add("instanceof");
reserved.add("new");
reserved.add("return");
reserved.add("switch");
reserved.add("this");
reserved.add("throw");
reserved.add("try");
reserved.add("typeof");
reserved.add("var");
reserved.add("void");
reserved.add("while");
reserved.add("with");
// Words reserved for future use
reserved.add("abstract");
reserved.add("boolean");
reserved.add("byte");
reserved.add("char");
reserved.add("class");
reserved.add("const");
reserved.add("debugger");
reserved.add("double");
reserved.add("enum");
reserved.add("export");
reserved.add("extends");
reserved.add("final");
reserved.add("float");
reserved.add("goto");
reserved.add("implements");
reserved.add("import");
reserved.add("int");
reserved.add("interface");
reserved.add("long");
reserved.add("native");
reserved.add("package");
reserved.add("private");
reserved.add("protected");
reserved.add("public");
reserved.add("short");
reserved.add("static");
reserved.add("super");
reserved.add("synchronized");
reserved.add("throws");
reserved.add("transient");
reserved.add("volatile");
// These are not reserved, but should be taken into account
// in isValidIdentifier (See jslint source code)
reserved.add("arguments");
reserved.add("eval");
reserved.add("true");
reserved.add("false");
reserved.add("Infinity");
reserved.add("NaN");
reserved.add("null");
reserved.add("undefined");
}