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+// Copyright 2010 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: jdtang@google.com (Jonathan Tang)
+//
+// Contains the definition of the top-level GumboParser structure that's
+// threaded through basically every internal function in the library.
+
+#ifndef GUMBO_PARSER_H_
+#define GUMBO_PARSER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct GumboInternalParserState;
+struct GumboInternalOutput;
+struct GumboInternalOptions;
+struct GumboInternalTokenizerState;
+
+// An overarching struct that's threaded through (nearly) all functions in the
+// library, OOP-style.  This gives each function access to the options and
+// output, along with any internal state needed for the parse.
+typedef struct GumboInternalParser {
+  // Settings for this parse run.
+  const struct GumboInternalOptions* _options;
+
+  // Output for the parse.
+  struct GumboInternalOutput* _output;
+
+  // The internal tokenizer state, defined as a pointer to avoid a cyclic
+  // dependency on html5tokenizer.h.  The main parse routine is responsible for
+  // initializing this on parse start, and destroying it on parse end.
+  // End-users will never see a non-garbage value in this pointer.
+  struct GumboInternalTokenizerState* _tokenizer_state;
+
+  // The internal parser state.  Initialized on parse start and destroyed on
+  // parse end; end-users will never see a non-garbage value in this pointer.
+  struct GumboInternalParserState* _parser_state;
+} GumboParser;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // GUMBO_PARSER_H_