1 files changed, 80 insertions, 0 deletions
diff --git a/libbuild2/build/script/lexer.hxx b/libbuild2/build/script/lexer.hxx
new file mode 100644
index 0000000..7d919e5
--- /dev/null
+++ b/libbuild2/build/script/lexer.hxx
@@ -0,0 +1,80 @@
+// file      : libbuild2/build/script/lexer.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_BUILD_SCRIPT_LEXER_HXX
+#define LIBBUILD2_BUILD_SCRIPT_LEXER_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/script/lexer.hxx>
+
+#include <libbuild2/build/script/token.hxx>
+
+namespace build2
+{
+  namespace build
+  {
+    namespace script
+    {
+      struct lexer_mode: build2::script::lexer_mode
+      {
+        using base_type = build2::script::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.
+        };
+
+        lexer_mode () = default;
+        lexer_mode (value_type v): base_type (v) {}
+        lexer_mode (build2::lexer_mode v): base_type (v) {}
+      };
+
+      class lexer: public build2::script::lexer
+      {
+      public:
+        using base_lexer = build2::script::lexer;
+
+        // Note that neither the name nor escape arguments are copied.
+        //
+        lexer (istream& is,
+               const path_name& name,
+               uint64_t line,         // Start line in the stream.
+               lexer_mode m,
+               const char* escapes = nullptr)
+            : base_lexer (is, name, line,
+                          nullptr /* escapes */,
+                          false   /* set_mode */,
+                          redirect_aliases)
+        {
+          mode (m, '\0', escapes);
+        }
+
+        virtual void
+        mode (build2::lexer_mode,
+              char = '\0',
+              optional<const char*> = nullopt,
+              uintptr_t = 0) override;
+
+        virtual token
+        next () override;
+
+      public:
+        static redirect_aliases_type redirect_aliases;
+
+      private:
+        token
+        next_line ();
+
+        virtual token
+        word (state, bool) override;
+      };
+    }
+  }
+}
+
+#endif // LIBBUILD2_BUILD_SCRIPT_LEXER_HXX