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/* Styling for ui_file
Copyright (C) 2018-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef UI_STYLE_H
#define UI_STYLE_H
/* Styles that can be applied to a ui_file. */
struct ui_file_style
{
/* One of the basic colors that can be handled by ANSI
terminals. */
enum basic_color
{
NONE = -1,
BLACK,
RED,
GREEN,
YELLOW,
BLUE,
MAGENTA,
CYAN,
WHITE
};
/* Representation of a terminal color. */
class color
{
public:
color (basic_color c)
: m_simple (true),
m_value (c)
{
}
color (int c)
: m_simple (true),
m_value (c)
{
gdb_assert (c >= -1 && c <= 255);
}
color (uint8_t r, uint8_t g, uint8_t b)
: m_simple (false),
m_red (r),
m_green (g),
m_blue (b)
{
}
bool operator== (const color &other) const
{
if (m_simple != other.m_simple)
return false;
if (m_simple)
return m_value == other.m_value;
return (m_red == other.m_red && m_green == other.m_green
&& m_blue == other.m_blue);
}
bool operator< (const color &other) const
{
if (m_simple != other.m_simple)
return m_simple < other.m_simple;
if (m_simple)
return m_value < other.m_value;
if (m_red < other.m_red)
return true;
if (m_red == other.m_red)
{
if (m_green < other.m_green)
return true;
if (m_green == other.m_green)
return m_blue < other.m_blue;
}
return false;
}
/* Return true if this is the "NONE" color, false otherwise. */
bool is_none () const
{
return m_simple && m_value == NONE;
}
/* Return true if this is one of the basic colors, false
otherwise. */
bool is_basic () const
{
return m_simple && m_value >= BLACK && m_value <= WHITE;
}
/* Return the value of a basic color. */
int get_value () const
{
gdb_assert (is_basic ());
return m_value;
}
/* Fill in RGB with the red/green/blue values for this color.
This may not be called for basic colors or for the "NONE"
color. */
void get_rgb (uint8_t *rgb) const;
/* Append the ANSI terminal escape sequence for this color to STR.
IS_FG indicates whether this is a foreground or background
color. Returns true if any characters were written; returns
false otherwise (which can only happen for the "NONE"
color). */
bool append_ansi (bool is_fg, std::string *str) const;
private:
bool m_simple;
int m_value;
uint8_t m_red, m_green, m_blue;
};
/* Intensity settings that are available. */
enum intensity
{
NORMAL = 0,
BOLD,
DIM
};
ui_file_style () = default;
ui_file_style (color f, color b, intensity i = NORMAL)
: m_foreground (f),
m_background (b),
m_intensity (i)
{
}
bool operator== (const ui_file_style &other) const
{
return (m_foreground == other.m_foreground
&& m_background == other.m_background
&& m_intensity == other.m_intensity
&& m_reverse == other.m_reverse);
}
bool operator!= (const ui_file_style &other) const
{
return !(*this == other);
}
/* Return the ANSI escape sequence for this style. */
std::string to_ansi () const;
/* Return true if this style is the default style; false
otherwise. */
bool is_default () const
{
return (m_foreground == NONE
&& m_background == NONE
&& m_intensity == NORMAL
&& !m_reverse);
}
/* Return true if this style specified reverse display; false
otherwise. */
bool is_reverse () const
{
return m_reverse;
}
/* Set/clear the reverse display flag. */
void set_reverse (bool reverse)
{
m_reverse = reverse;
}
/* Return the foreground color of this style. */
const color &get_foreground () const
{
return m_foreground;
}
/* Set the foreground color of this style. */
void set_fg (color c)
{
m_foreground = c;
}
/* Return the background color of this style. */
const color &get_background () const
{
return m_background;
}
/* Set the background color of this style. */
void set_bg (color c)
{
m_background = c;
}
/* Return the intensity of this style. */
intensity get_intensity () const
{
return m_intensity;
}
/* Parse an ANSI escape sequence in BUF, modifying this style. BUF
must begin with an ESC character. Return true if an escape
sequence was successfully parsed; false otherwise. In either
case, N_READ is updated to reflect the number of chars read from
BUF. */
bool parse (const char *buf, size_t *n_read);
private:
color m_foreground = NONE;
color m_background = NONE;
intensity m_intensity = NORMAL;
bool m_reverse = false;
};
/* Skip an ANSI escape sequence in BUF. BUF must begin with an ESC
character. Return true if an escape sequence was successfully
skipped; false otherwise. In either case, N_READ is updated to
reflect the number of chars read from BUF. */
extern bool skip_ansi_escape (const char *buf, int *n_read);
#endif /* UI_STYLE_H */
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