csgrep --mode=sarif: use SARIF output format

The writer is not yet implemented, only the output format switch.

Closes: #39

Author: kdudka

src/abstract-parser.hh

@@ -32,7 +32,8 @@ enum EFileFormat {
     FF_COVERITY,                            ///< what cov-format-errors produces
     FF_GCC,                                 ///< GCC format
     FF_JSON,                                ///< JSON format
-    FF_HTML                                 ///< HTML format (output only)
+    FF_HTML,                                ///< HTML format (output only)
+    FF_SARIF                                ///< SARIF format (used by GitHub)
 };
 
 // abstract class with a factory method

src/abstract-writer.cc

@@ -104,6 +104,10 @@ AbstractWriter* createWriter(
             writer = new HtmlWriter(strDst, emp, emp, spPlacement);
             break;
         }
+
+        case FF_SARIF:
+            writer = new JsonWriter(strDst, FF_SARIF);
+            break;
     }
 
     if (!scanProps.empty())

src/csgrep.cc

@@ -415,7 +415,11 @@ class WriterFactory {
         }
 
         static AbstractWriter* createJson() {
-            return new JsonWriter(std::cout);
+            return new JsonWriter(std::cout, FF_JSON);
+        }
+
+        static AbstractWriter* createSarif() {
+            return new JsonWriter(std::cout, FF_SARIF);
         }
 
         static AbstractWriter* createKeyEventPrinter() {
@@ -435,6 +439,7 @@ class WriterFactory {
             tbl_["grep"]            = createGrep;
             tbl_["grouped"]         = createGrouped;
             tbl_["json"]            = createJson;
+            tbl_["sarif"]           = createSarif;
             tbl_["stat"]            = createStat;
         }
 
@@ -593,7 +598,7 @@ int main(int argc, char *argv[])
             ("quiet,q",                                         "do not report any parsing errors")
 
             ("mode",                po::value<string>(&mode)
-                                    ->default_value("grep"),    "grep, json, evtstat, files, filestat, grouped, stat, or dig_key_events")
+                                    ->default_value("grep"),    "grep, json, evtstat, files, filestat, grouped, sarif, stat, or dig_key_events")
 
             ("help",                                            "print the usage of csgrep")
             ("version",                                         "print the version of csgrep");

src/json-writer.cc

@@ -41,9 +41,16 @@ struct JsonWriter::Private {
     }
 };
 
-JsonWriter::JsonWriter(std::ostream &str):
+JsonWriter::JsonWriter(std::ostream &str, const EFileFormat format):
     d(new Private(str))
 {
+    switch (format) {
+        case FF_JSON:
+            break;
+
+        default:
+            throw std::runtime_error("unknown output format");
+    }
 }
 
 JsonWriter::~JsonWriter()

src/json-writer.hh

@@ -26,7 +26,7 @@
 
 class JsonWriter: public AbstractWriter {
     public:
-        JsonWriter(std::ostream &);
+        JsonWriter(std::ostream &, EFileFormat format = FF_JSON);
         virtual ~JsonWriter();
 
         virtual const TScanProps& getScanProps() const;