Added streaming parser for structured data format.

Added JSON streaming parser. Note that currently JSON parser ignores
frac and exp parts of number construct.

1 files changed, 86 insertions, 0 deletions

diff --git a/src/GenericParser.h b/src/GenericParser.h
new file mode 100644
index 00000000..77985f69
--- /dev/null
+++ b/src/GenericParser.h
@@ -0,0 +1,86 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2012 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef D_GENERIC_PARSER_H
+#define D_GENERIC_PARSER_H
+
+#include "common.h"
+#include "SharedHandle.h"
+
+namespace aria2 {
+
+template<typename Parser, typename ParserStateMachine>
+class GenericParser {
+public:
+  GenericParser()
+    : parser_(&psm_)
+  {}
+
+  ~GenericParser()
+  {}
+
+  // Parses |size| bytes of data |data| and returns the number of
+  // bytes processed. On error, one of the negative error codes is
+  // returned.
+  ssize_t parseUpdate(const char* data, size_t size)
+  {
+    return parser_.parseUpdate(data, size);
+  }
+
+  // Parses |size| bytes of data |data| and returns result. On error,
+  // null value is returned. On success, the |error| will be the
+  // number of bytes processed (>= 0). On error, it will be one of the
+  // negative error code. This function also resets underlying parser
+  // facility and make it ready to reuse.
+  typename ParserStateMachine::ResultType
+  parseFinal(const char* data, size_t size, ssize_t& error)
+  {
+    typename ParserStateMachine::ResultType res;
+    error = parser_.parseFinal(data, size);
+    if(error < 0) {
+      res = ParserStateMachine::noResult;
+    } else {
+      res = psm_.getResult();
+    }
+    parser_.reset();
+    return res;
+  }
+private:
+  ParserStateMachine psm_;
+  Parser parser_;
+};
+
+} // namespace aria2
+
+#endif // D_GENERIC_PARSER_H