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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
# text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2025 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.app/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################
set brlErrorCategory braille
set brlUnicodeRow [expr {0X2800 + 0}]
set brfDotsTable {
0
2346
5
3456
1246
146
12346
3
12356
23456
16
346
6
36
46
34
356
2
23
25
256
26
235
2356
236
35
156
56
126
123456
345
1456
4
1
12
14
145
15
124
1245
125
24
245
13
123
134
1345
135
1234
12345
1235
234
2345
136
1236
2456
1346
13456
1356
246
1256
12456
45
456
}
proc brlThrowError {code problem {value ""}} {
set message $problem
if {[string length $value] > 0} {
append message ": $value"
}
return -code error -errorcode [list $::brlErrorCategory $code $problem $value] $message
}
proc brlHexadecimalToDecimal {hexadecimal} {
if {![string is xdigit -strict $hexadecimal]} {
brlThrowError not-hex "not a hexadecimal number" $hexadecimal
}
scan $hexadecimal "%x" decimal
return $decimal
}
proc brlCharacterToCodepoint {character} {
if {[string length $character] != 1} {
brlThrowError not-char "not a single character" $character
}
scan $character "%c" codepoint
return $codepoint
}
proc brlCodepointToCharacter {codepoint} {
if {![string is integer -strict $codepoint]} {
brlThrowError not-int "not an integer" $codepoint
}
return [format "%c" "$codepoint"]
}
proc brlCharacterToDots {character} {
if {[string length $character] == 1} {
global brlUnicodeRow
set codepoint [brlCharacterToCodepoint $character]
set bits [expr {$codepoint & 0XFF}]
if {($codepoint - $bits) == $brlUnicodeRow} {
set dots ""
set dot 1
set bit 0X01
while {$bits != 0} {
if {($bits & $bit) != 0} {
set bits [expr {$bits & ~$bit}]
append dots $dot
}
set bit [expr {$bit << 1}]
incr dot
}
if {[string length $dots] > 0} {
return $dots
}
return "0"
}
global brfDotsTable
set index [expr {$codepoint - 0X20}]
if {($codepoint >= 0X60) && ($codepoint <= 0X7E)} {
incr index -0X20
}
if {($index >= 0) && ($index < [llength $brfDotsTable])} {
return [lindex $brfDotsTable $index]
}
}
brlThrowError not-brl "not a braille character" $character
}
proc brlDotsToCharacter {dots} {
if {[string length $dots] == 0} {
brlThrowError no-dots "no dot numbers"
}
global brlUnicodeRow
set codepoint $brlUnicodeRow
if {![string equal $dots "0"]} {
foreach dot [split $dots ""] {
if {[string first $dot "12345678"] == -1} {
brlThrowError not-dot "Not a dot number" $dot
}
set bit [expr {1 << ($dot - 1)}]
if {($codepoint & $bit) != 0} {
brlThrowError dup-dot "duplicate dot number" $dot
}
incr codepoint $bit
}
}
return [brlCodepointToCharacter $codepoint]
}
proc brlFormatCodepoint {codepoint} {
set digits [format "%X" $codepoint]
set length [string length $digits]
set letter "z"
foreach {count letter} {2 x 4 u 8 U} {
if {$length <= $count} {
set digits "[string repeat "0" [expr {$count - $length}]]$digits"
break
}
}
return "\\$letter$digits"
}
|
