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diff --git a/third_party/wasm2c/include/wabt/wast-lexer.h b/third_party/wasm2c/include/wabt/wast-lexer.h
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index 0000000000..80bdfe7bb4
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+++ b/third_party/wasm2c/include/wabt/wast-lexer.h
@@ -0,0 +1,117 @@
+/*
+ * 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 "wabt/common.h"
+#include "wabt/error.h"
+#include "wabt/lexer-source-line-finder.h"
+#include "wabt/literal.h"
+#include "wabt/opcode.h"
+#include "wabt/token.h"
+
+namespace wabt {
+
+class ErrorHandler;
+class LexerSource;
+
+class WastLexer {
+ public:
+  WABT_DISALLOW_COPY_AND_ASSIGN(WastLexer);
+
+  WastLexer(std::unique_ptr<LexerSource> source,
+            std::string_view filename,
+            Errors*);
+
+  // Convenience functions.
+  static std::unique_ptr<WastLexer> CreateBufferLexer(std::string_view filename,
+                                                      const void* data,
+                                                      size_t size,
+                                                      Errors*);
+
+  Token GetToken();
+
+  // TODO(binji): Move this out of the lexer.
+  std::unique_ptr<LexerSourceLineFinder> MakeLineFinder() {
+    return std::make_unique<LexerSourceLineFinder>(source_->Clone());
+  }
+
+ private:
+  static constexpr int kEof = -1;
+  enum class CharClass { IdChar = 1, Keyword = 2, HexDigit = 4, Digit = 8 };
+
+  Location GetLocation();
+  std::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(std::string_view);
+  void Newline();
+  bool ReadBlockComment();             // 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 IsIdChar(int c) { return IsCharClass(c, CharClass::IdChar); }
+
+  bool ReadNum();
+  bool ReadHexNum();
+
+  enum class ReservedChars { None, Some, Id };
+  ReservedChars ReadReservedChars();
+  bool NoTrailingReservedChars() {
+    return ReadReservedChars() == ReservedChars::None;
+  }
+  void ReadSign();
+  Token GetStringToken();
+  Token GetNumberToken(TokenType);
+  Token GetHexNumberToken(TokenType);
+  Token GetInfToken();
+  Token GetNanToken();
+  Token GetNameEqNumToken(std::string_view name, TokenType);
+  Token GetIdChars();
+  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_;
+
+  Errors* errors_;
+  void WABT_PRINTF_FORMAT(3, 4) Error(Location, const char* format, ...);
+};
+
+}  // namespace wabt
+
+#endif /* WABT_WAST_LEXER_H_ */