Add println and printf to LogTracer

Author: 64json

include/LogTracer.h

@@ -1,6 +1,7 @@
 #ifndef CPP_LOGTRACER_H
 #define CPP_LOGTRACER_H
 
+#include <regex>
 #include "Tracer.h"
 
 class LogTracer : Tracer {
@@ -32,6 +33,57 @@ class LogTracer : Tracer {
         addTrace(key, "print", json::array({message}));
         return *this;
     }
+
+    LogTracer println(json message) {
+        addTrace(key, "println", json::array({message}));
+        return *this;
+    }
+
+    LogTracer printf(string format, ...) {
+        json traceArgs = json::array({format});
+
+        va_list args;
+        va_start(args, format);
+        string::const_iterator searchStart(format.cbegin());
+        const std::regex exp(
+                "(?:[^\\x25]|^)(?:\\x25{2})*\\x25(?:([1-9]\\d*)\\$|\\(([^)]+)\\))?(\\+)?(0|'[^$])?(-)?(\\d+)?(?:\\.(\\d+))?([b-gijostTuvxX])");
+        std::smatch match;
+        while (std::regex_search(searchStart, format.cend(), match, exp)) {
+            char specifier = match.str(8).at(0);
+            switch (specifier) {
+                case 'b':
+                case 'c':
+                case 'd':
+                case 'i':
+                case 'u':
+                case 'o':
+                case 't':
+                case 'x':
+                case 'X':
+                    traceArgs.push_back(va_arg(args, int));
+                    break;
+                case 'e':
+                case 'f':
+                case 'g':
+                    traceArgs.push_back(va_arg(args, double));
+                    break;
+                case 's':
+                    traceArgs.push_back(va_arg(args, char *));
+                    break;
+                case 'T':
+                case 'v':
+                case 'j':
+                    throw std::invalid_argument("Format Not Supported");
+                default:
+                    break;
+            }
+            searchStart = match.suffix().first;
+        }
+        va_end(args);
+
+        addTrace(key, "printf", traceArgs);
+        return *this;
+    }
 };
 
 #endif