cppparser: support C++11 raw string literals

dtool/src/cppparser/cppExpression.cxx

@@ -1558,6 +1558,10 @@ output(ostream &out, int indent_level, CPPScope *scope, bool) const {
           out << "\\\"";
           break;
 
+        case '\\':
+          out << "\\\\";
+          break;
+
         default:
           if (isprint(*si)) {
             out << *si;

dtool/src/cppparser/cppPreprocessor.cxx

@@ -1870,11 +1870,19 @@ get_identifier(int c) {
   loc.last_column = get_col_number();
 
   if ((c == '\'' || c == '"') &&
-      (name == "L" || name == "u8" ||
-       name == "u" || name == "U")) {
+      (name == "L" || name == "u8" || name == "u" || name == "U" ||
+       name == "R" || name == "LR" || name == "u8R" || name == "uR" || name == "UR")) {
     // This is actually a wide-character or wide-string literal or some such.
-    // Figure out the correct character type to use.
+    get();
+    string str;
+    if (name[name.size() - 1] == 'R') {
+      name.resize(name.size() - 1);
+      str = scan_raw(c);
+    } else {
+      str = scan_quoted(c);
+    }
 
+    // Figure out the correct character type to use.
     CPPExpression::Type type;
     if (name == "L") {
       type = CPPExpression::T_wstring;
@@ -1887,8 +1895,6 @@ get_identifier(int c) {
     } else {
       type = CPPExpression::T_string;
     }
-    get();
-    string str = scan_quoted(c);
 
     loc.last_line = get_line_number();
     loc.last_column = get_col_number();
@@ -2772,6 +2778,43 @@ scan_quoted(int c) {
   return str;
 }
 
+/**
+ * Parses a C++11 raw string.
+ */
+string CPPPreprocessor::
+scan_raw(int c) {
+  int quote_mark = c;
+
+  string delimiter = ")";
+
+  string str;
+  c = get();
+  while (c != EOF && c != '(') {
+    delimiter += c;
+    c = get();
+  }
+
+  // OK, now start parsing the string, until we see the delimiter again.
+  c = get();
+  while (c != EOF) {
+    if (c == quote_mark) {
+      // We encountered a quote mark - did the last part of the string end
+      // with the given delimiter?  If so, we've reached the end.
+      if (str.compare(str.size() - delimiter.size(), delimiter.size(), delimiter) == 0) {
+        str.resize(str.size() - delimiter.size());
+        break;
+      }
+    }
+    str += c;
+    c = get();
+  }
+
+  if (c != quote_mark) {
+    warning("Unclosed string");
+  }
+  return str;
+}
+
 /**
  * Returns true if the manifest is one that is being ignored right now
  * (presumably because we are presently expanding it).

dtool/src/cppparser/cppPreprocessor.h

@@ -166,6 +166,7 @@ private:
   static int check_keyword(const string &name);
   int scan_escape_sequence(int c);
   string scan_quoted(int c);
+  string scan_raw(int c);
 
   bool should_ignore_manifest(const CPPManifest *manifest) const;
   bool should_ignore_preprocessor() const;