core: Making an all C++ version of the preferences/config file readers.

This replaces the Python config parser stuff; should have same functionality that we need.

3 files changed, 132 insertions, 9 deletions

diff --git a/gnuradio-core/src/lib/general/gr_prefs.cc b/gnuradio-core/src/lib/general/gr_prefs.cc
index 20aead8e3..40601f7c4 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.cc
+++ b/gnuradio-core/src/lib/general/gr_prefs.cc
@@ -25,6 +25,13 @@
 #endif
 
 #include <gr_prefs.h>
+#include <gr_constants.h>
+#include <algorithm>
+
+#include <boost/filesystem/operations.hpp>
+#include <boost/filesystem/path.hpp>
+#include <boost/filesystem/fstream.hpp>
+namespace fs = boost::filesystem;
 
 /*
  * Stub implementations
@@ -45,44 +52,153 @@ gr_prefs::set_singleton(gr_prefs *p)
   s_singleton = p;
 }
 
+gr_prefs::gr_prefs()
+{
+  _read_files();
+}
+
 gr_prefs::~gr_prefs()
 {
   // nop
 }
 
+std::vector<std::string>
+gr_prefs::_sys_prefs_filenames()
+{
+  fs::path dir = gr_prefsdir();
+  if(!fs::is_directory(dir))
+    std::runtime_error("gr_prefs: preference path does not exist.\n");
+
+  std::vector<std::string> fnames;
+  fs::directory_iterator diritr(dir);
+  while(diritr != fs::directory_iterator()) {
+    fs::path p = *diritr++;
+    fnames.push_back(p.string());
+  }
+  std::sort(fnames.begin(), fnames.end());
+  return fnames;
+}
+
+void
+gr_prefs::_read_files()
+{
+  std::vector<std::string> filenames = _sys_prefs_filenames();
+  std::vector<std::string>::iterator sitr;
+  char tmp[1024];
+  for(sitr = filenames.begin(); sitr != filenames.end(); sitr++) {
+    fs::ifstream fin(*sitr);
+    while(!fin.eof()) {
+      fin.getline(tmp, 1024);
+      std::string t(tmp);
+      // ignore empty lines or lines of just comments
+      if((t.size() > 0) && (t[0] != '#')) {
+	// remove any comments in the line
+	size_t hash = t.find("#");
+
+	// Use hash marks at the end of each segment as a delimiter
+	d_configs += t.substr(0, hash) + '#';
+      }
+    }
+    fin.close();
+  }
+
+  // Remove all whitespace
+  d_configs.erase(std::remove_if(d_configs.begin(), d_configs.end(), ::isspace), d_configs.end());
+}
+
 bool
 gr_prefs::has_section(const std::string section)
 {
-  return false;
+  size_t t = d_configs.find("[" + section + "]#");
+  return t != std::string::npos;
 }
 
 bool
 gr_prefs::has_option(const std::string section, const std::string option)
 {
-  return false;
+  if(has_section(section)) {
+    size_t sec = d_configs.find("[" + section + "]#");
+    size_t opt = d_configs.find("#" + option + "=", sec);
+    return opt != std::string::npos;
+  }
+  else {
+    return false;
+  }
 }
 
 const std::string
 gr_prefs::get_string(const std::string section, const std::string option, const std::string default_val)
 {
-  return default_val;
+  if(has_option(section, option)) {
+    std::string optname = "#" + option + "=";
+    size_t sec = d_configs.find("[" + section + "]#");
+    size_t opt = d_configs.find(optname, sec);
+    
+    size_t start = opt + optname.size();
+    size_t end = d_configs.find("#", start);
+    size_t len = end - start;
+    
+    return d_configs.substr(start, len);
+  }
+  else {
+    return default_val;
+  }
 }
 
 bool
 gr_prefs::get_bool(const std::string section, const std::string option, bool default_val)
 {
-  return default_val;
+  if(has_option(section, option)) {
+    std::string str = get_string(section, option, "");
+    if(str == "") {
+      return default_val;
+    }
+    std::transform(str.begin(), str.end(), str.begin(), ::tolower);
+    if(str == "true")
+      return true;
+    else if(str == "false")
+      return false;
+    else
+      return default_val;
+  }
+  else {
+    return default_val;
+  }
 }
 
 long
 gr_prefs::get_long(const std::string section, const std::string option, long default_val)
 {
-  return default_val;
+  if(has_option(section, option)) {
+    std::string str = get_string(section, option, "");
+    if(str == "") {
+      return default_val;
+    }
+    std::stringstream sstr(str);
+    long n;
+    sstr >> n;
+    return n;
+  }
+  else {
+    return default_val;
+  }
 }
 
 double
 gr_prefs::get_double(const std::string section, const std::string option, double default_val)
 {
-  return default_val;
+  if(has_option(section, option)) {
+    std::string str = get_string(section, option, "");
+    if(str == "") {
+      return default_val;
+    }
+    std::stringstream sstr(str);
+    double n;
+    sstr >> n;
+    return n;
+  }
+  else {
+    return default_val;
+  }
 }
 
diff --git a/gnuradio-core/src/lib/general/gr_prefs.h b/gnuradio-core/src/lib/general/gr_prefs.h
index b1c354bd3..90d602741 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.h
+++ b/gnuradio-core/src/lib/general/gr_prefs.h
@@ -24,6 +24,7 @@
 
 #include <gr_core_api.h>
 #include <string>
+#include <gruel/thread.h>
 
 /*!
  * \brief Base class for representing user preferences a la windows INI files.
@@ -39,6 +40,7 @@ public:
   static gr_prefs *singleton();
   static void set_singleton(gr_prefs *p);
 
+  gr_prefs();
   virtual ~gr_prefs();
 
   /*!
@@ -78,6 +80,14 @@ public:
   virtual double get_double(const std::string section,
 			    const std::string option,
 			    double default_val);
+
+ protected:
+  virtual std::vector<std::string> _sys_prefs_filenames();
+  virtual void _read_files();
+
+ private:
+  gruel::mutex d_mutex;
+  std::string d_configs;
 };
 
 
diff --git a/gnuradio-core/src/lib/general/gr_prefs.i b/gnuradio-core/src/lib/general/gr_prefs.i
index f44dcc944..cfb4cdb4e 100644
--- a/gnuradio-core/src/lib/general/gr_prefs.i
+++ b/gnuradio-core/src/lib/general/gr_prefs.i
@@ -20,9 +20,6 @@
  * Boston, MA 02110-1301, USA.
  */
 
-// Generate SWIG directors for gr_prefs.
-%feature("director") gr_prefs;
-
 class gr_prefs
 {
 public: