/*
* If either 'eval' or 'with' is used in a local scope, we must make sure
* that all containing local scopes don't get munged. Otherwise, the
* obfuscation would potentially introduce bugs.
*/
private void protectScopeFromObfuscation(ScriptOrFnScope scope) {
assert scope != null;
if (scope == globalScope) {
// The global scope does not get obfuscated,
// so we don't need to worry about it...
return;
}
// Find the highest local scope containing the specified scope.
while (scope.getParentScope() != globalScope) {
scope = scope.getParentScope();
}
assert scope.getParentScope() == globalScope;
scope.preventMunging();
}
/*
* Returns the identifier for the specified symbol defined in the specified
* scope or in any scope above it. Returns null if this symbol does not have
* a corresponding identifier.
*/
private JavaScriptIdentifier getIdentifier(String symbol, ScriptOrFnScope scope) {
JavaScriptIdentifier identifier;
while (scope != null) {
identifier = scope.getIdentifier(symbol);
if (identifier != null) {
return identifier;
}
scope = scope.getParentScope(); // ??此代码不知何意
}
return null;
}