Reorganizing the code. Moved nlsat to its own directory.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/ast/for_each_ast.cpp

@@ -0,0 +1,45 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    for_each_ast.cpp
+
+Abstract:
+
+    For each ast visitor
+
+Author:
+
+    Leonardo de Moura (leonardo) 2006-10-18.
+
+Revision History:
+
+--*/
+
+#include"for_each_ast.h"
+
+struct ast_counter_proc {
+    unsigned m_num;
+    ast_counter_proc():m_num(0) {}
+    void operator()(ast *) { m_num++; } 
+};
+
+unsigned get_num_nodes(ast * n) {
+    for_each_ast_proc<ast_counter_proc> counter;
+    for_each_ast(counter, n);
+    return counter.m_num;
+}
+
+
+bool for_each_parameter(ptr_vector<ast> & stack, ast_mark & visited, unsigned num_args, parameter const * params) {
+    bool result = true;
+    for (unsigned i = 0; i < num_args; i++) {
+        parameter const& p = params[i];
+        if (p.is_ast() && !visited.is_marked(p.get_ast())) {
+            stack.push_back(p.get_ast());
+            result = false;
+        }
+    }
+    return result;    
+}