Merge pull request #451 from mgreter/source_maps_win_rel_paths

Problem with relative path on windows and source maps

Author: Aaron Leung

file.cpp

@@ -172,12 +172,10 @@ namespace Sass {
           }
         }
       }
-      string extension;
-      if (real_path.length() > 5) {
-        extension = real_path.substr(real_path.length() - 5, 5);
-      }
-      for(size_t i=0; i<extension.size();++i)
-        extension[i] = tolower(extension[i]);
+#ifdef _WIN32
+      // convert Windows backslashes to URL forward slashes
+      replace(real_path.begin(), real_path.end(), '\\', '/');
+#endif
       return contents;
     }
 

source_map.cpp

@@ -4,20 +4,43 @@
 #include "context.hpp"
 #endif
 
+#include <string>
 #include <sstream>
 #include <cstddef>
+#include <iomanip>
 
 namespace Sass {
   using std::ptrdiff_t;
   SourceMap::SourceMap(const string& file) : current_position(Position(1, 1)), file(file) { }
 
+  // taken from http://stackoverflow.com/a/7725289/1550314
+  std::string encodeJsonString(const std::string& input) {
+    std::ostringstream ss;
+    for (std::string::const_iterator iter = input.begin(); iter != input.end(); iter++) {
+        switch (*iter) {
+            case '\\': ss << "\\\\"; break;
+            case '"': ss << "\\\""; break;
+            case '\b': ss << "\\b"; break;
+            case '\f': ss << "\\f"; break;
+            case '\n': ss << "\\n"; break;
+            case '\r': ss << "\\r"; break;
+            case '\t': ss << "\\t"; break;
+            // is a legal escape in JSON
+            case '/': ss << "\\/"; break;
+            default: ss << *iter; break;
+        }
+    }
+
+    return ss.str();
+  }
+
   string SourceMap::generate_source_map() {
     string result = "{\n";
     result += "  \"version\": 3,\n";
-    result += "  \"file\": \"" + file + "\",\n";
+    result += "  \"file\": \"" + encodeJsonString(file) + "\",\n";
     result += "  \"sources\": [";
     for (size_t i = 0; i < files.size(); ++i) {
-      result+="\"" + files[i] + "\",";
+      result+="\"" + encodeJsonString(files[i]) + "\",";
     }
     if (!files.empty()) result.erase(result.length() - 1);
     result += "],\n";