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diff --git a/libbuild2/test/script/lexer.hxx b/libbuild2/test/script/lexer.hxx
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+// file : libbuild2/test/script/lexer.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_TEST_SCRIPT_LEXER_HXX
+#define LIBBUILD2_TEST_SCRIPT_LEXER_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/lexer.hxx>
+
+#include <libbuild2/test/script/token.hxx>
+
+namespace build2
+{
+ namespace test
+ {
+ namespace script
+ {
+ struct lexer_mode: build2::lexer_mode
+ {
+ using base_type = build2::lexer_mode;
+
+ enum
+ {
+ command_line = base_type::value_next,
+ first_token, // Expires at the end of the token.
+ second_token, // Expires at the end of the token.
+ variable_line, // Expires at the end of the line.
+ command_expansion,
+ here_line_single,
+ here_line_double,
+ description_line // Expires at the end of the line.
+ };
+
+ lexer_mode () = default;
+ lexer_mode (value_type v): base_type (v) {}
+ lexer_mode (base_type v): base_type (v) {}
+ };
+
+ class lexer: public build2::lexer
+ {
+ public:
+ using base_lexer = build2::lexer;
+ using base_mode = build2::lexer_mode;
+
+ lexer (istream& is,
+ const path& name,
+ lexer_mode m,
+ const char* escapes = nullptr)
+ : base_lexer (is,
+ name,
+ 1 /* line */,
+ nullptr /* escapes */,
+ false /* set_mode */)
+ {
+ mode (m, '\0', escapes);
+ }
+
+ virtual void
+ mode (base_mode,
+ char = '\0',
+ optional<const char*> = nullopt) override;
+
+ // Number of quoted (double or single) tokens since last reset.
+ //
+ size_t
+ quoted () const {return quoted_;}
+
+ void
+ reset_quoted (size_t q) {quoted_ = q;}
+
+ virtual token
+ next () override;
+
+ protected:
+ token
+ next_line ();
+
+ token
+ next_description ();
+
+ virtual token
+ word (state, bool) override;
+
+ protected:
+ size_t quoted_;
+ };
+ }
+ }
+}
+
+#endif // LIBBUILD2_TEST_SCRIPT_LEXER_HXX