Improve parser

src/HalfMove.cpp

@@ -63,4 +63,17 @@ void HalfMove::Copy(HalfMove *copy) {
     var->Copy(new_var);
   }
 }
+
+HalfMove *HalfMove::GetHalfMoveAt(int distance) {
+  HalfMove *tmp=this;
+  while(distance>0){
+    if(tmp==NULL){
+      throw HalfMoveOutOfRange();
+    }
+    distance--;
+    tmp=tmp->MainLine;
+  }
+  return(tmp);
+}
+
 } // namespace pgnp

src/HalfMove.hpp

@@ -34,5 +34,11 @@ public:
   std::string Dump();
   /// @brief Perform a deep copy of a HalfMove
   void Copy(HalfMove *copy);
+  /// @brief Get HalfMove located x down the MainLine 
+  HalfMove* GetHalfMoveAt(int);
+};
+
+struct HalfMoveOutOfRange : public std::exception {
+  const char *what() const throw() { return "HalfMove distance is out of range"; }
 };
 } // namespace pgnp

src/PGN.cpp

@@ -33,7 +33,7 @@ void PGN::FromFile(std::string filepath) {
 
 void PGN::FromString(std::string pgn_content) {
   this->pgn_content = pgn_content;
-  moves = NULL;
+  moves = new HalfMove();
   int loc = 0;
   while (!IS_EOF(loc)) {
     char c = pgn_content[loc];
@@ -41,9 +41,11 @@ void PGN::FromString(std::string pgn_content) {
       if (c == '[') {
         loc = ParseNextTag(loc);
       } else if (IS_DIGIT(c)) {
-        moves = new HalfMove();
         loc = ParseHalfMove(loc, moves);
         break;
+      } else if (c=='{') {
+        loc = ParseComment(loc,moves);
+        continue; // No need loc++
       }
     }
     loc++;
@@ -82,6 +84,27 @@ bool PGN::HasTag(std::string key) {
   return (std::find(tags.begin(), tags.end(), key) != tags.end());
 }
 
+int PGN::ParseComment(int loc, HalfMove *hm) {
+  // Goto next char
+  loc = NextNonBlank(loc);
+  EOF_CHECK(loc);
+  char c = pgn_content[loc];
+  
+  if(c=='{'){
+    loc++;
+    EOF_CHECK(loc);
+    c = pgn_content[loc];
+    while(c!='}'){
+      hm->comment+=c;
+      loc++;
+      EOF_CHECK(loc);
+      c = pgn_content[loc];
+    }
+    loc++; // Skip '}'
+  }
+  return(loc);
+}
+
 int PGN::ParseHalfMove(int loc, HalfMove *hm) {
   // Goto next char
   loc = NextNonBlank(loc);
@@ -147,19 +170,8 @@ int PGN::ParseHalfMove(int loc, HalfMove *hm) {
     return (loc);
   }
 
-  // Check for comment
-  loc = NextNonBlank(loc);
-  if (!IS_EOF(loc) && pgn_content[loc] == '{') {
-    loc++; // Skip '{'
-    c = pgn_content[loc];
-    while (c != '}') {
-      hm->comment += c;
-      loc++;
-      EOF_CHECK(loc);
-      c = pgn_content[loc];
-    }
-    loc++; // Skip '}'
-  }
+  // Parse comment
+  loc=ParseComment(loc,hm);
 
   // Check for variations
   loc = NextNonBlank(loc);

src/PGN.hpp

@@ -47,6 +47,7 @@ private:
   int NextNonBlank(int);
   /// @brief Parse a HalfMove at a specific location into @a pgn_content
   int ParseHalfMove(int, HalfMove *);
+  int ParseComment(int,HalfMove *);
 };
 
 struct UnexpectedEOF : public std::exception {

tests/tests.cpp

@@ -58,6 +58,7 @@ TEST_CASE("Valid PGN", "[valid/pgn1]") {
     CHECK_THROWS_AS(pgn.GetTagValue("InvalidTagName"), InvalidTagName);
   }
 
+  CHECK(m_backup->GetHalfMoveAt(4)->move == "c4");
   CHECK(pgn.GetResult() == "*");
 }
 
@@ -69,6 +70,8 @@ TEST_CASE("Valid PGN", "[valid/pgn2]") {
   pgn.GetMoves(m);
   REQUIRE(m->GetLength() == 66);
   CHECK(pgn.GetResult() == "0-1");
+  CHECK(m->comment == " A00 Hungarian Opening ");
+  CHECK(m->GetHalfMoveAt(7)->comment == " (0.22 → 0.74) Inaccuracy. dxc4 was best. ");
 }
 
 TEST_CASE("Seven Tag Roster", "[std/pgn1]") {