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diff --git a/third_party/wasm2c/src/wast-lexer.h b/third_party/wasm2c/src/wast-lexer.h
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+++ b/third_party/wasm2c/src/wast-lexer.h
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+/*
+ * Copyright 2016 WebAssembly Community Group participants
+ *
+ * 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.
+ */
+
+#ifndef WABT_WAST_LEXER_H_
+#define WABT_WAST_LEXER_H_
+
+#include <cstddef>
+#include <cstdio>
+#include <memory>
+
+#include "src/common.h"
+#include "src/lexer-source-line-finder.h"
+#include "src/literal.h"
+#include "src/make-unique.h"
+#include "src/opcode.h"
+#include "src/token.h"
+
+namespace wabt {
+
+class ErrorHandler;
+class LexerSource;
+class WastParser;
+
+class WastLexer {
+ public:
+  WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
+
+  WastLexer(std::unique_ptr<LexerSource> source, string_view filename);
+
+  // Convenience functions.
+  static std::unique_ptr<WastLexer> CreateBufferLexer(string_view filename,
+                                                      const void* data,
+                                                      size_t size);
+
+  Token GetToken(WastParser* parser);
+
+  // TODO(binji): Move this out of the lexer.
+  std::unique_ptr<LexerSourceLineFinder> MakeLineFinder() {
+    return MakeUnique<LexerSourceLineFinder>(source_->Clone());
+  }
+
+ private:
+  static const int kEof = -1;
+  enum class CharClass { Reserved = 1, Keyword = 2, HexDigit = 4, Digit = 8 };
+
+  Location GetLocation();
+  string_view GetText(size_t offset = 0);
+
+  Token BareToken(TokenType);
+  Token LiteralToken(TokenType, LiteralType);
+  Token TextToken(TokenType, size_t offset = 0);
+
+  int PeekChar();
+  int ReadChar();
+  bool MatchChar(char);
+  bool MatchString(string_view);
+  void Newline();
+  bool ReadBlockComment(WastParser*);  // Returns false if EOF.
+  bool ReadLineComment();              // Returns false if EOF.
+  void ReadWhitespace();
+
+  static bool IsCharClass(int c, CharClass);
+  static bool IsDigit(int c) { return IsCharClass(c, CharClass::Digit); }
+  static bool IsHexDigit(int c) { return IsCharClass(c, CharClass::HexDigit); }
+  static bool IsKeyword(int c) { return IsCharClass(c, CharClass::Keyword); }
+  static bool IsReserved(int c) { return IsCharClass(c, CharClass::Reserved); }
+
+  bool ReadNum();
+  bool ReadHexNum();
+  int ReadReservedChars();
+  bool NoTrailingReservedChars() { return ReadReservedChars() == 0; }
+  void ReadSign();
+  Token GetStringToken(WastParser*);
+  Token GetNumberToken(TokenType);
+  Token GetHexNumberToken(TokenType);
+  Token GetInfToken();
+  Token GetNanToken();
+  Token GetNameEqNumToken(string_view name, TokenType);
+  Token GetIdToken();
+  Token GetKeywordToken();
+  Token GetReservedToken();
+
+  std::unique_ptr<LexerSource> source_;
+  std::string filename_;
+  int line_;
+  const char* buffer_;
+  const char* buffer_end_;
+  const char* line_start_;
+  const char* token_start_;
+  const char* cursor_;
+};
+
+}  // namespace wabt
+
+#endif /* WABT_WAST_LEXER_H_ */