add YAML parser

src/coders/BasicParser.inl

@@ -31,10 +31,17 @@ namespace {
 }
 
 template<typename CharT>
-void BasicParser<CharT>::skipWhitespace() {
+void BasicParser<CharT>::skipWhitespace(bool newline) {
+    if (hashComment) {
+        skipWhitespaceHashComment(newline);
+        return;
+    }
     while (hasNext()) {
         char next = source[pos];
         if (next == '\n') {
+            if (!newline) {
+                break;
+            }
             line++;
             linestart = ++pos;
             continue;
@@ -47,6 +54,36 @@ void BasicParser<CharT>::skipWhitespace() {
     }
 }
 
+template<typename CharT>
+void BasicParser<CharT>::skipWhitespaceHashComment(bool newline) {
+    while (hasNext()) {
+        char next = source[pos];
+        if (next == '\n') {
+            if (!newline) {
+                break;
+            }
+            line++;
+            linestart = ++pos;
+            continue;
+        }
+        if (is_whitespace(next)) {
+            pos++;
+        } else {
+            break;
+        }
+    }
+    if (hasNext() && source[pos] == '#') {
+        if (!newline) {
+            readUntilEOL();
+            return;
+        }
+        skipLine();
+        if (hasNext() && (is_whitespace(source[pos]) || source[pos] == '#')) {
+            skipWhitespaceHashComment(newline);
+        }
+    }
+}
+
 template<typename CharT>
 void BasicParser<CharT>::skip(size_t n) {
     n = std::min(n, source.length() - pos);
@@ -73,6 +110,12 @@ void BasicParser<CharT>::skipLine() {
     }
 }
 
+template<typename CharT>
+void BasicParser<CharT>::skipEmptyLines() {
+    skipWhitespace();
+    pos = linestart;
+}
+
 template<typename CharT>
 bool BasicParser<CharT>::skipTo(const std::basic_string<CharT>& substring) {
     size_t idx = source.find(substring, pos);