1 files changed, 123 insertions, 0 deletions
diff --git a/gcc/text-art/theme.h b/gcc/text-art/theme.h
new file mode 100644
index 0000000..8edbc6e
--- /dev/null
+++ b/gcc/text-art/theme.h
@@ -0,0 +1,123 @@
+/* Classes for abstracting ascii vs unicode output.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   Contributed by David Malcolm <dmalcolm@redhat.com>.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_TEXT_ART_THEME_H
+#define GCC_TEXT_ART_THEME_H
+
+#include "text-art/canvas.h"
+#include "text-art/box-drawing.h"
+
+namespace text_art {
+
+class theme
+{
+ public:
+  enum class cell_kind
+  {
+    /* A left-hand edge of a range e.g. "├".  */
+    X_RULER_LEFT_EDGE,
+
+    /* Within a range e.g. "─".  */
+    X_RULER_MIDDLE,
+
+    /* A border between two neighboring ranges e.g. "┼".  */
+    X_RULER_INTERNAL_EDGE,
+
+    /* The connector with the text label within a range e.g. "┬".  */
+    X_RULER_CONNECTOR_TO_LABEL_BELOW,
+
+    /* As above, but when the text label is above the ruler.  */
+    X_RULER_CONNECTOR_TO_LABEL_ABOVE,
+
+    /* The vertical connection to a text label.  */
+    X_RULER_VERTICAL_CONNECTOR,
+
+    /* A right-hand edge of a range e.g. "┤".  */
+    X_RULER_RIGHT_EDGE,
+
+    TEXT_BORDER_HORIZONTAL,
+    TEXT_BORDER_VERTICAL,
+    TEXT_BORDER_TOP_LEFT,
+    TEXT_BORDER_TOP_RIGHT,
+    TEXT_BORDER_BOTTOM_LEFT,
+    TEXT_BORDER_BOTTOM_RIGHT,
+
+    Y_ARROW_UP_HEAD,
+    Y_ARROW_UP_TAIL,
+    Y_ARROW_DOWN_HEAD,
+    Y_ARROW_DOWN_TAIL,
+  };
+
+  virtual ~theme () = default;
+
+  virtual bool unicode_p () const = 0;
+  virtual bool emojis_p () const = 0;
+
+  virtual canvas::cell_t
+  get_line_art (directions line_dirs) const = 0;
+
+  canvas::cell_t get_cell (enum cell_kind kind, unsigned style_idx) const
+  {
+    return canvas::cell_t (get_cppchar (kind), false, style_idx);
+  }
+
+  virtual cppchar_t get_cppchar (enum cell_kind kind) const = 0;
+
+  enum class y_arrow_dir { UP, DOWN };
+  void paint_y_arrow (canvas &canvas,
+		      int x,
+		      canvas::range_t y_range,
+		      y_arrow_dir dir,
+		      style::id_t style_id) const;
+};
+
+class ascii_theme : public theme
+{
+ public:
+  bool unicode_p () const final override { return false; }
+  bool emojis_p () const final override { return false; }
+
+  canvas::cell_t
+  get_line_art (directions line_dirs) const final override;
+
+  cppchar_t get_cppchar (enum cell_kind kind) const final override;
+};
+
+class unicode_theme : public theme
+{
+ public:
+  bool unicode_p () const final override { return true; }
+  bool emojis_p () const override { return false; }
+
+  canvas::cell_t
+  get_line_art (directions line_dirs) const final override;
+
+  cppchar_t get_cppchar (enum cell_kind kind) const final override;
+};
+
+class emoji_theme : public unicode_theme
+{
+public:
+  bool emojis_p () const final override { return true; }
+};
+
+} // namespace text_art
+
+#endif /* GCC_TEXT_ART_THEME_H */