csfilter: add custom message filters from JSON files

Closes #11

Author: lzaoral

src/csfilter.cc

@@ -17,10 +17,11 @@
  * along with csdiff.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "abstract-tree.hh"
 #include "csfilter.hh"
 #include "regex.hh"
 
-#include <iostream>
+#include <boost/property_tree/json_parser.hpp>
 
 // Setup verbosity for debugging string substitions while matching them.
 // Verbosity levels are from 0 to 3 (0 is off)
@@ -150,6 +151,56 @@ void MsgFilter::setIgnorePath(bool enable)
     d->ignorePath = enable;
 }
 
+bool MsgFilter::setFilterFiles(
+                const TStringList &fileNames,
+                bool               silent)
+{
+    try {
+        for (const std::string &file : fileNames) {
+            InStream filter(file, silent);
+            if (!setJSONFilter(filter))
+                return false;
+        }
+        return true;
+    }
+    catch (const InFileException &e) {
+        std::cerr << e.fileName << ": failed to open filter file\n";
+        return false;
+    }
+}
+
+bool MsgFilter::setJSONFilter(InStream &input)
+{
+    using namespace boost::property_tree;
+
+    try {
+        // parse JSON
+        ptree root;
+        read_json(input.str(), root);
+
+        // read filtering rules
+        for (const auto &filter_rule : root.get_child("msg-filter")) {
+            const auto &filter = filter_rule.second;
+            d->addMsgFilter(getStringValue(filter.get_child("checker")),
+                            getStringValue(filter.get_child("regexp")),
+                            valueOf(filter, "replace", std::string{}));
+        }
+        return true;
+    }
+    catch (boost::regex_error &e) {
+        input.handleError(e.what());
+        return false;
+    }
+    catch (file_parser_error &e) {
+        input.handleError(e.message(), e.line());
+        return false;
+    }
+    catch (ptree_error &e) {
+        input.handleError(e.what());
+        return false;
+    }
+}
+
 void MsgFilter::setFileNameSubstitution(
                 const std::string      &oldFile,
                 const std::string      &newFile)

src/csfilter.hh

@@ -20,9 +20,13 @@
 #ifndef H_GUARD_CSFILTER_H
 #define H_GUARD_CSFILTER_H
 
+#include "instream.hh"
+
 #include <map>
 #include <string>
+#include <vector>
 
+typedef std::vector<std::string> TStringList;
 typedef std::map<std::string, std::string> TSubstMap;
 
 class MsgFilter {
@@ -35,6 +39,8 @@ class MsgFilter {
         }
 
         void setIgnorePath(bool);
+        bool setFilterFiles(const TStringList &fileNames,
+                            bool               silent);
         void setFileNameSubstitution(
                 const std::string      &oldFile,
                 const std::string      &newFile);
@@ -48,6 +54,8 @@ class MsgFilter {
         MsgFilter();
         ~MsgFilter();
 
+        bool setJSONFilter(InStream &filter);
+
         static MsgFilter *self_;
         struct Private;
         Private *d;