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diff --git a/tiger-compiler/src/parse/tweast.hh b/tiger-compiler/src/parse/tweast.hh
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+++ b/tiger-compiler/src/parse/tweast.hh
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+/**
+ ** \file parse/tweast.hh
+ ** \brief Declaration of parse::Tweast.
+ */
+
+#pragma once
+
+#include <iostream>
+#include <map>
+#include <sstream>
+
+#include <ast/fwd.hh>
+
+#include <misc/map.hh>
+#include <misc/symbol.hh>
+#include <parse/metavar-map.hh>
+
+namespace parse
+{
+  /// \brief TWEAST stands for ``Text With Embedded Abstract Syntax Trees''.
+  ///
+  /// Aggregate string to parse and tables of metavariables.
+  class Tweast
+    : public MetavarMap<ast::Exp>
+    , public MetavarMap<ast::Var>
+    , public MetavarMap<ast::NameTy>
+    , public MetavarMap<ast::ChunkList>
+    , public MetavarMap<parse::Tweast>
+  {
+  public:
+    Tweast();
+    Tweast(const std::string& str);
+
+    /// \brief Stream manipulator.
+    ///
+    /// Append Tiger expressions to the string to parse.
+    template <typename T> Tweast& operator<<(const T& t);
+
+    /// Metavariables manipulator.
+    template <typename T> T* take(unsigned s);
+
+    /// Move the contents of all aggregated Tweast metavariables into
+    /// the current Tweast.
+    void flatten();
+
+    /// Get the current input string.
+    std::string input_get() const;
+
+    /// Print the table
+    std::ostream& dump(std::ostream& ostr) const;
+
+  protected:
+    // Insert base class members in the current scope.
+    using MetavarMap<ast::Exp>::append_;
+    using MetavarMap<ast::Var>::append_;
+    using MetavarMap<ast::NameTy>::append_;
+    using MetavarMap<ast::ChunkList>::append_;
+    using MetavarMap<Tweast>::append_;
+
+    /// Fake append (default case, i.e. when \a data is not a metavariable).
+    template <typename T> T& append_(unsigned&, T& data) const;
+
+    template <typename T>
+    void move_metavars_(Tweast& tweast, std::string& input);
+
+  protected:
+    /// The next identifier suffix to create.
+    static unsigned count_;
+
+    /// The string to parse.
+    std::stringstream input_;
+  };
+
+  /// Display the content of the tweast.
+  std::ostream& operator<<(std::ostream& ostr, const Tweast& in);
+
+} // namespace parse
+
+#include <parse/tweast.hxx>