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|
#!/usr/bin/tclsh
# Part of MCU 8051 IDE ( http://http://www.moravia-microsystems.com/mcu8051ide )
############################################################################
# Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012 by Martin Ošmera #
# martin.osmera@gmail.com #
# #
# Copyright (C) 2014 by Moravia Microsystems, s.r.o. #
# martin.osmera@moravia-microsystems.com #
# #
# 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 2 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, write to the #
# Free Software Foundation, Inc., #
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. #
############################################################################
# >>> File inclusion guard
if { ! [ info exists _ASCIICHART_TCL ] } {
set _ASCIICHART_TCL _
# <<< File inclusion guard
# --------------------------------------------------------------------------
# DESCRIPTION
# Interactive ASCII chart
# --------------------------------------------------------------------------
class AsciiChart {
public common ascii_chr_count 0 ;# Int: Counter of object instances
public common ASCII_TABLE ;# Array of List: ASCII table
array set ASCII_TABLE {
0 {NUL ^@ \\0 {Null character}}
1 {SOH ^A {} {Start of Header}}
2 {STX ^B {} {Start of Text}}
3 {ETX ^C {} {End of Text}}
4 {EOT ^D {} {End of Transmission}}
5 {ENQ ^E {} {Enquiry}}
6 {ACK ^F {} {Acknowledgment}}
7 {BEL ^G \\a {Bell}}
8 {BS ^H \\b {Backspace}}
9 {HT ^I \\t {Horizontal Tab}}
10 {LF ^J \\n {Line feed}}
11 {VT ^K \\v {Vertical Tab}}
12 {FF ^L \\f {Form feed}}
13 {CR ^M \\r {Carriage return}}
14 {SO ^N {} {Shift Out}}
15 {SI ^O {} {Shift In}}
16 {DLE ^P {} {Data Link Escape}}
17 {DC1 ^Q {} {Device Control 1 (oft. XON)}}
18 {DC2 ^R {} {Device Control 2}}
19 {DC3 ^S {} {Device Control 3 (oft. XOFF)}}
20 {DC4 ^T {} {Device Control 4}}
21 {NAK ^U {} {Negative Acknowledgement}}
22 {SYN ^V {} {Synchronous Idle}}
23 {ETB ^W {} {End of Trans. Block}}
24 {CAN ^X {} {Cancel}}
25 {EM ^Y {} {End of Medium}}
26 {SUB ^Z {} {Substitute}}
27 {ESC ^[ \\e {Escape}}
28 {FS ^\\ {} {File Separator}}
29 {GS ^] {} {Group Separator}}
30 {RS ^^ {} {Record Separator}}
31 {US ^_ {} {Unit Separator}}
127 {DEL ^? {} {Delete}}
32 {{ }} 33 ! 34 \\\" 35 #
36 $ 37 % 38 & 39 '
40 ( 41 ) 42 * 43 +
44 , 45 - 46 . 47 /
48 0 49 1 50 2 51 3
52 4 53 5 54 6 55 7
56 8 57 9 58 : 59 ;
60 < 61 = 62 > 63 ?
64 @ 65 A 66 B 67 C
68 D 69 E 70 F 71 G
72 H 73 I 74 J 75 K
76 L 77 M 78 N 79 O
80 P 81 Q 82 R 83 S
84 T 85 U 86 V 87 W
88 X 89 Y 90 Z 91 [
92 \\ 93 ] 94 ^ 95 _
96 ` 97 a 98 b 99 c
100 d 101 e 102 f 103 g
104 h 105 i 106 j 107 k
108 l 109 m 110 n 111 o
112 p 113 q 114 r 115 s
116 t 117 u 118 v 119 w
120 x 121 y 122 z 123 \\\{
124 | 125 \\\} 126 ~
}
private variable obj_idx ;# Int: Object index (for entrybox textvariables)
private variable selected_cell -1 ;# Int: Currently selected cell
private variable validation_ena 1 ;# Bool: EntryBox validation enabled
private variable win ;# Widget: Dialog window
private variable window_visible 0 ;# Bool: Visibility flag
private variable cells ;# Array of Widget: Chart cell frames
private variable vh_cells ;# Array of Widget: Vertical headers
private variable hh_cells ;# Array of Widget: Horizontal headers
private variable status_bar_lbl ;# Widget: Status bar
private variable char_ent ;# Widget: Entrybox "Character:"
private variable hex_addr_ent ;# Widget: Entrybox "Hexadecimal address:"
private variable dec_addr_ent ;# Widget: Entrybox "Decimal address:"
private variable oct_addr_ent ;# Widget: Entrybox "Octal address:"
private variable bin_addr_ent ;# Widget: Entrybox "Binary address:"
private variable caret_not_ent ;# Widget: Entrybox "Caret notation:"
private variable escape_seq_ent ;# Widget: Entrybox "C escape sequence:"
constructor {} {
# Configure local ttk styles
ttk::style configure AsciiChart_BlueFg.TEntry -foreground {#0000DD}
ttk::style configure AsciiChart_RedFg.TEntry -foreground {#DD0000}
ttk::style configure AsciiChart_RedBg.TEntry -fieldbackground {#FFDDDD}
ttk::style configure AsciiChart_GreenBg.TEntry -fieldbackground {#DDFFDD}
# Create dialog window
set window_visible 1
set win [toplevel .asciichart${ascii_chr_count} -class {ASCII chart} -bg ${::COMMON_BG_COLOR}]
set obj_idx $ascii_chr_count
incr ascii_chr_count
# Create dialog GUI
create_gui
# Set window event bindings
bind $win <Control-Key-q> "$this close_window; break"
bindtags $win [list $win Toplevel all .]
# Set window parameters
wm iconphoto $win ::ICONS::16::math_matrix
wm title $win "[mc {ASCII chart}] - MCU 8051 IDE"
wm resizable $win 0 0
wm protocol $win WM_DELETE_WINDOW "$this close_window"
}
destructor {
destroy $win
}
## Determinate wheather the window is visble or not
# @return Bool - Visibility flag
public method is_visible {} {
return $window_visible
}
## Close dialog window, but keep object
# @return void
public method close_window {} {
set window_visible 0
wm withdraw $win
}
## Restore dialog window
# @return void
public method restore_window {} {
set window_visible 1
wm deiconify $win
raise $win .
}
## Raise dialog window (insure than it is visible)
# @return void
public method raise_window {} {
if {!$window_visible} {return}
raise $win .
}
## Create window GUI
# @return void
private method create_gui {} {
# Create bottom frame
set bottom_frame [frame $win.bottom_frame]
set status_bar_lbl [label $bottom_frame.status_bar_lbl -justify left -anchor w]
pack $status_bar_lbl -side left -fill x -in $bottom_frame
pack [ttk::button $bottom_frame.close_but \
-text [mc "Exit"] \
-command "$this close_window" \
-compound left \
-image ::ICONS::16::exit \
] -side right -padx 5 -pady 5
## Create main frame
set main_frame [frame $win.main_frame -bg {#DDDDDD}]
# Create vertical header
grid [frame $main_frame.top_right_lbl -bg ${::COMMON_BG_COLOR}] -sticky wens -row 0 -column 0
set header [list {} \
{0x0_} {0x1_} {0x2_} {0x3_} \
{0x4_} {0x5_} {0x6_} {0x7_} \
]
for {set y 1} {$y < 9} {incr y} {
grid [label $main_frame.vh_lbl$y -text [lindex $header $y] -bg {#FFFFFF}] \
-row $y -column 0 -pady [expr {$y % 2}] -sticky wens
set vh_cells([expr {$y - 1}]) $main_frame.vh_lbl$y
}
# Create horizontal header
set header [list {} \
{0x_0} {0x_1} {0x_2} {0x_3} \
{0x_4} {0x_5} {0x_6} {0x_7} \
{0x_8} {0x_9} {0x_A} {0x_B} \
{0x_C} {0x_D} {0x_E} {0x_F} \
]
for {set x 1} {$x < 17} {incr x} {
grid [label $main_frame.hh_lbl$x -text [lindex $header $x] -bg {#FFFFFF}] \
-row 0 -column $x -padx [expr {$x % 2}] -sticky wens
set hh_cells([expr {$x - 1}]) $main_frame.hh_lbl$x
}
# Create ASCII chart matrix
set hex_addr 0
set address 0
for {set y 1} {$y < 9} {incr y} {
for {set x 1} {$x < 17} {incr x} {
# Create cell frame
set frame [frame $main_frame.cell_$address \
-bg white -bd 0 \
]
# Determinate hexadecimal address
set hex_addr [format %X $address]
if {$address < 16} {
set hex_addr "0$hex_addr"
}
set hex_addr "0x$hex_addr"
# Determinate character in the chart and color for it
set val [lindex $ASCII_TABLE($address) 0]
if {[string length $val] > 1} {
set foreground {#DD0000}
} else {
set foreground {#0000DD}
}
# Create label containing character name
pack [label $frame.char_lbl -pady 0 \
-fg $foreground -bg white -text $val \
]
# Create label containing character address
pack [label $frame.val_lbl \
-fg {#00DD00} -text $hex_addr \
-bg white -pady 0 \
]
grid $frame -row $y -column $x -padx [expr {$x % 2}] -pady [expr {$y % 2}] -sticky wens
set cells($address) $frame
foreach wdg [list $frame $frame.val_lbl $frame.char_lbl] {
bind $wdg <Enter> "$this cell_enter $address"
bind $wdg <Leave> "$this cell_leave $address"
bind $wdg <Button-1> "$this cell_click $address"
}
if {$address < 127} {
bind $frame <Key-Right> [list $this cell_click [expr {$address + 1}]]
}
if {$address > 0} {
bind $frame <Key-Left> [list $this cell_click [expr {$address - 1}]]
}
if {$address > 16} {
bind $frame <Key-Up> [list $this cell_click [expr {$address - 16}]]
}
if {$address < 112} {
bind $frame <Key-Down> [list $this cell_click [expr {$address + 16}]]
}
incr address
}
}
# Ensure than all cells have the same width and heigh
for {set i 0} {$i < 17} {incr i} {
grid columnconfigure $main_frame $i -uniform ascii
}
for {set i 1} {$i < 9} {incr i} {
grid rowconfigure $main_frame $i -uniform ascii
}
# Show ASCII chart
pack $main_frame -pady 5 -side top
## Create details frame (character details)
# Create labelframe
set details_frame_header_frm [frame $win.details_frame_header_frm]
pack [label $details_frame_header_frm.lbl -text [mc "Character: "]] -side left
set char_ent [ttk::entry $details_frame_header_frm.ent \
-validatecommand "$this char_ent_validator %P" \
-width 4 \
-validate key \
]
pack $char_ent -side left
set details_frame [ttk::labelframe $win.details_frame \
-labelwidget $details_frame_header_frm \
-padding 10 \
]
# Entryboxes: HEX and DEC
grid [label $details_frame.hex_addr_lbl \
-text [mc "Hex address"] \
] -row 0 -column 0 -sticky w
grid [label $details_frame.dec_addr_lbl \
-text [mc "Dec address"] \
] -row 1 -column 0 -sticky w
set hex_addr_ent [ttk::entry $details_frame.hex_addr_ent \
-validatecommand "$this addr_ent_validator H %P" \
-validate key \
-width 3 \
]
set dec_addr_ent [ttk::entry $details_frame.dec_addr_ent \
-validatecommand "$this addr_ent_validator D %P" \
-validate key \
-width 3 \
]
grid $hex_addr_ent -row 0 -column 2 -sticky w
grid $dec_addr_ent -row 1 -column 2 -sticky w
# Entryboxes: OCT and BIN
grid [label $details_frame.oct_addr_lbl \
-text [mc "Oct address"] \
] -row 0 -column 4 -sticky w
grid [label $details_frame.bin_addr_lbl \
-text [mc "Bin address"] \
] -row 1 -column 4 -sticky w
set oct_addr_ent [ttk::entry $details_frame.oct_addr_ent \
-validate key \
-width 3 \
-validatecommand "$this addr_ent_validator O %P" \
]
set bin_addr_ent [ttk::entry $details_frame.bin_addr_ent \
-validate key \
-width 8 \
-validatecommand "$this addr_ent_validator B %P" \
]
grid $oct_addr_ent -row 0 -column 6 -sticky w
grid $bin_addr_ent -row 1 -column 6 -sticky w
# Entryboxes: "Caret notation" and "C Escape Code"
grid [label $details_frame.caret_not_lbl \
-text [mc "Caret notation"] \
] -row 0 -column 8 -sticky w
grid [label $details_frame.escape_seq_lbl \
-text [mc "C Escape Code"] \
] -row 1 -column 8 -sticky w
set caret_not_ent [ttk::entry $details_frame.caret_not_ent \
-validate key \
-width 3 \
-validatecommand "$this more_detail_ent_validator C %P" \
]
set escape_seq_ent [ttk::entry $details_frame.escape_seq_ent \
-validate key \
-width 3 \
-validatecommand "$this more_detail_ent_validator E %P" \
]
grid $caret_not_ent -row 0 -column 10 -sticky w
grid $escape_seq_ent -row 1 -column 10 -sticky w
# Create copy buttons (copy entrybox contents to clipboard)
foreach type {H D O B C E} \
row {0 1 0 1 0 1} \
col {1 1 5 5 9 9} \
{
grid [ttk::button $details_frame.copy_${type}_but \
-command "$this copy_contents ${type}" \
-image ::ICONS::16::editcopy \
-style Flat.TButton \
] -row $row -column $col -sticky w -padx 3
DynamicHelp::add $details_frame.copy_${type}_but \
-text [mc "%s - Copy contents of entrybox to clipboard" $type]
bind $details_frame.copy_${type}_but <Enter> \
"$status_bar_lbl configure -text {[mc {Copy to clipboard}]}"
bind $details_frame.copy_${type}_but <Leave> \
"$status_bar_lbl configure -text {}"
}
# Configure event bindings for entryboxes
foreach widget [list \
$char_ent $hex_addr_ent $dec_addr_ent $oct_addr_ent \
$bin_addr_ent $caret_not_ent $escape_seq_ent \
] {
bindtags $widget [list $widget TEntry $win all .]
}
# Configure details frame
grid columnconfigure $details_frame 3 -minsize 20
grid columnconfigure $details_frame 7 -minsize 20
grid columnconfigure $details_frame 11 -weight 1
# Finalize ...
pack $details_frame -padx 5 -anchor w -fill x
pack $bottom_frame -fill x
focus -force $char_ent
}
## Set background color for certain cell in ASCII chart matrix
# @parm Int address - Cell address
# @parm Color color - New background color
# @return void
private method sel_bg_color {address color} {
$cells($address) configure -bg $color
$cells($address).char_lbl configure -bg $color
$cells($address).val_lbl configure -bg $color
$hh_cells([expr {$address & 0x0F}]) configure -bg $color
$vh_cells([expr {($address & 0xF0) >> 4}]) configure -bg $color
}
## Handles event when mouse pointer enters certain cell in the ASCII chart
# @parm Int address - Cell address
# @return void
public method cell_enter {address} {
$status_bar_lbl configure -text [lindex $ASCII_TABLE($address) 3]
if {$selected_cell == $address} {
return
}
sel_bg_color $address {#DDFFDD}
}
## Handles event when mouse pointer leaves certain cell in the ASCII chart
# @parm Int address - Cell address
# @return void
public method cell_leave {address} {
if {$selected_cell == $address} {
return
}
sel_bg_color $address {#FFFFFF}
$status_bar_lbl configure -text {}
if {$selected_cell != -1} {
$hh_cells([expr {$selected_cell & 0x0F}]) configure -bg {#BBBBFF}
$vh_cells([expr {($selected_cell & 0xF0) >> 4}]) configure -bg {#BBBBFF}
}
}
## Handles event when clicks on certain cell in the ASCII chart
# @parm Int address - Cell address
# @return void
public method cell_click {address} {
if {$selected_cell == $address} {
unselect_current_cell 1 1
set selected_cell -1
return
}
focus $cells($address)
select_cell $address
if {$selected_cell != -1} {
fill_entryboxes $address {}
}
}
## Copy contents of certain entrybox to clipboard
# @parm Char type - Entrybox ID
# H - Hexadecimal address
# D - Decimal address
# O - Octal address
# B - Binary address
# C - Caret notation
# E - C escape sequence
# @return void
public method copy_contents {type} {
switch -- $type {
{H} {set widget $hex_addr_ent}
{D} {set widget $dec_addr_ent}
{O} {set widget $oct_addr_ent}
{B} {set widget $bin_addr_ent}
{C} {set widget $caret_not_ent}
{E} {set widget $escape_seq_ent}
}
clipboard clear
clipboard append [$widget get]
}
## Select specified cell in ASCII chart (mark as selected and adjust details frame)
# @parm Int address - Cell address
# @return void
private method select_cell {address} {
if {$selected_cell != -1} {
unselect_current_cell 0 0
}
set selected_cell $address
sel_bg_color $address {#BBBBFF}
}
## Unselect specified cell in ASCII chart (mark as normal and clear details frame)
# @parm Bool keep_current - Mark cell as a cell under mouse pointer (light green bg. color)
# @parm Bool affect_entryboxes - Clear entryboxes in details frame
# @return void
private method unselect_current_cell {keep_current affect_entryboxes} {
if {$selected_cell == -1} {
return
}
# Set new background color
if {$keep_current} {
sel_bg_color $selected_cell {#DDFFDD}
} else {
sel_bg_color $selected_cell {#FFFFFF}
}
# Clear entryboxes in details frame
if {$affect_entryboxes} {
set validation_ena 0
foreach widget [list \
$char_ent $hex_addr_ent $dec_addr_ent $oct_addr_ent \
$bin_addr_ent $caret_not_ent $escape_seq_ent \
] {
$widget delete 0 end
$widget configure -style TEntry
}
$char_ent configure -style TEntry
set validation_ena 1
}
}
## Clear entryboxes in details frame
# @parm Char type - Entrybox to exclude
# M - Character
# H - Hexadecimal address
# D - Decimal address
# O - Octal address
# B - Binary address
# C - Caret notation
# E - C escape sequence
# @return void
private method clear_entryboxes {type} {
set validation_ena 0
foreach entry_type {M H D O B C E} \
entry_widget [list \
$char_ent $hex_addr_ent $dec_addr_ent $oct_addr_ent \
$bin_addr_ent $caret_not_ent $escape_seq_ent \
] \
{
if {$type == $entry_type} {
continue
}
$entry_widget delete 0 end
$entry_widget configure -style TEntry
}
set validation_ena 1
}
## Show details for character in specified address
# @parm Int address - Cell address
# @parm Char type - Entrybox to exclude
# M - Character
# H - Hexadecimal address
# D - Decimal address
# O - Octal address
# B - Binary address
# C - Caret notation
# E - C escape sequence
# @return void
private method fill_entryboxes {address type} {
clear_entryboxes $type
set validation_ena 0
# Character
if {$type != {M}} {
set value [lindex $ASCII_TABLE($address) 0]
$char_ent insert insert $value
if {[string length $value] > 1} {
$char_ent configure -style AsciiChart_RedFg.TEntry
} else {
$char_ent configure -style AsciiChart_BlueFg.TEntry
}
}
# Hexadecimal address
if {$type != {H}} {
set value [format %X $address]
if {$address < 16} {
set value "0$value"
}
$hex_addr_ent insert insert $value
}
# Decimal address
if {$type != {D}} {
$dec_addr_ent insert insert $address
}
# Octal address
if {$type != {O}} {
$oct_addr_ent insert insert [::NumSystem::dec2oct $address]
}
# Binary address
if {$type != {B}} {
set value [::NumSystem::dec2bin $address]
set len [string length $value]
if {$len < 8} {
set value "[string repeat 0 [expr {8 - $len}]]$value"
}
$bin_addr_ent insert insert $value
}
# Caret notation
if {$type != {C}} {
$caret_not_ent insert insert [lindex $ASCII_TABLE($address) 1]
}
# C escape sequence
if {$type != {E}} {
$escape_seq_ent insert insert [lindex $ASCII_TABLE($address) 2]
}
set validation_ena 1
}
## Validator for entrybox "Character"
# @parm String string - New entrybox contents
# @return Bool - Always 1
public method char_ent_validator {string} {
if {!$validation_ena} {return 1}
set validation_ena 0
## Validate input string
set length [string length $string]
if {!$length} {
$char_ent configure -style TEntry
clear_entryboxes M
unselect_current_cell 0 0
set validation_ena 1
return 1
}
if {$length > 3} {
set validation_ena 1
return 0
}
# Search for the given character in the ASCII chart
if {$length > 1} {
set string [string toupper $string]
}
for {set i 0} {$i < 128} {incr i} {
if {![string compare [lindex $ASCII_TABLE($i) 0] $string]} {
select_cell $i
fill_entryboxes $i M
if {$length > 1} {
$char_ent configure -style AsciiChart_RedFg.TEntry
} else {
$char_ent configure -style AsciiChart_BlueFg.TEntry
}
set validation_ena 1
return 1
}
}
# Character not found
clear_entryboxes M
unselect_current_cell 0 0
$char_ent configure -style StringNotFound.TEntry
set validation_ena 1
return 1
}
## Validator for entryboxes "Hex","Dec","Oct" and "Bin"
# @parm Char type - Source entry box
# H - Hexadecimal address
# D - Decimal address
# O - Octal address
# B - Binary address
# @parm String string - New entrybox contents
# @return Bool - Allways 1
public method addr_ent_validator {type string} {
if {!$validation_ena} {return 1}
set validation_ena 0
switch -- $type {
H {set widget $hex_addr_ent}
D {set widget $dec_addr_ent}
O {set widget $oct_addr_ent}
B {set widget $bin_addr_ent}
}
# Empty input string
set length [string length $string]
if {!$length} {
$widget configure -style TEntry
clear_entryboxes $type
unselect_current_cell 0 0
set validation_ena 1
return 1
}
# Validate input string and convert it into integer
switch -- $type {
H { ;# Hexadecimal
if {$length > 2 || ![string is xdigit -strict $string]} {
set validation_ena 1
return 0
}
set string [expr "0x$string"]
}
D { ;# Decimal
if {$length > 3 || ![string is digit -strict $string]} {
set validation_ena 1
return 0
}
}
O { ;# Octal
if {$length > 3 || ![regexp {^[0-7]+$} $string]} {
set validation_ena 1
return 0
}
set string [expr "0$string"]
}
B { ;# Binary
if {$length > 8 || ![regexp {^[01]+$} $string]} {
set validation_ena 1
return 0
}
set string [::NumSystem::bin2dec $string]
}
}
set string [string trimleft $string 0]
if {$string == {}} {
set string 0
}
# Check value range
if {$string > 127 || $string < 0} {
clear_entryboxes $type
unselect_current_cell 0 0
$widget configure -style AsciiChart_RedBg.TEntry
set validation_ena 1
return 1
}
# Adjust GUI (ACII chart and details frame)
select_cell $string
fill_entryboxes $string $type
$widget configure -style AsciiChart_GreenBg.TEntry
return 1
}
## Validator for entryboxes "Caret notation" and "C escape sequence"
# @parm Char type - Source entry box
# C - Caret notation
# E - C escape sequence
# @parm String string - New entrybox contents
# @return Bool - Allways 1
public method more_detail_ent_validator {type string} {
if {!$validation_ena} {return 1}
set validation_ena 0
# Dterminate widget object and index in ASCII chart array
if {$type == {C}} {
set widget $caret_not_ent
set index 1
} else {
set widget $escape_seq_ent
set index 2
}
# Empty input string
if {![string length $string]} {
$widget configure -style TEntry
clear_entryboxes $type
unselect_current_cell 0 0
set validation_ena 1
return 1
}
# Inputs string must not be longer than 2 characters
if {[string length $string] > 2} {
set validation_ena 1
return 0
}
# Search for the given string in the ASCII chart array
for {set i 0} {$i < 128} {incr i} {
if {![string compare [lindex $ASCII_TABLE($i) $index] $string]} {
select_cell $i
fill_entryboxes $i $type
$widget configure -style AsciiChart_GreenBg.TEntry
set validation_ena 1
return 1
}
}
# String not found
clear_entryboxes $type
unselect_current_cell 0 0
$widget configure -style AsciiChart_RedBg.TEntry
set validation_ena 1
return 1
}
}
# >>> File inclusion guard
}
# <<< File inclusion guard
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