ref: 83246e296ea433b65b9d295b5e08fedd39ff1ab7
dir: /appl/examples/minitel/keyb.b/
#
# Copyright © 1998 Vita Nuova Limited. All rights reserved.
#
# special keyboard operations
Extend, # enable cursor and editing keys and control chars
C0keys, # cursor keys send BS,HT,LF and VT
Invert # case inversion
: con 1 << iota;
Keyb: adt {
m: ref Module; # common attributes
in: chan of ref Event;
cmd: chan of string; # from Tk (keypresses and focus)
spec: int; # special keyboard extensions
init: fn(k: self ref Keyb, toplevel: ref Tk->Toplevel);
reset: fn(k: self ref Keyb);
run: fn(k: self ref Keyb);
quit: fn(k: self ref Keyb);
map: fn(k: self ref Keyb, key:int): array of byte;
};
Keyb.init(k: self ref Keyb, toplevel: ref Tk->Toplevel)
{
k.in = chan of ref Event;
k.cmd = chan of string;
tk->namechan(toplevel, k.cmd, "keyb"); # Tk -> keyboard
k.reset();
}
Keyb.reset(k: self ref Keyb)
{
k.m = ref Module(Pmodem|Psocket, 0);
}
ask(in: chan of string, out: chan of string)
{
keys: string;
T.mode = Videotex;
S.setmode(Videotex);
# clear(S);
prompt: con "Numéroter: ";
number := M.lastdialstr;
S.msg(prompt);
Input:
for(;;) {
n := len prompt + len number;
# guard length must be > len prompt
if (n > 30)
n -= 30;
else
n = 0;
S.msg(prompt + number[n:]);
keys = <- in;
if (keys == nil)
return;
keys = canoncmd(keys);
case keys {
"connect" or "send" =>
break Input;
"correct" =>
if(len number > 0)
number = number[0: len number -1];
"cancel" =>
number = "";
break Input;
"repeat" or "index" or "guide" or "next" or "previous" =>
;
* =>
number += keys;
}
}
S.msg(nil);
for (;;) alt {
out <- = number =>
return;
keys = <- in =>
if (keys == nil)
return;
}
}
Keyb.run(k: self ref Keyb)
{
dontask := chan of string;
askchan := dontask;
askkeys := chan of string;
Runloop:
for(;;){
alt {
ev := <- k.in =>
pick e := ev {
Equit =>
break Runloop;
Eproto =>
case e.cmd {
Creset =>
k.reset();
Cproto =>
case e.a0 {
START =>
case e.a1 {
LOWERCASE =>
k.spec |= Invert;
}
STOP =>
case e.a1 {
LOWERCASE =>
k.spec &= ~Invert;
}
}
* => break;
}
}
cmd := <- k.cmd =>
if(debug['k'] > 0) {
fprint(stderr, "Tk %s\n", cmd);
}
(n, args) := sys->tokenize(cmd, " ");
if(n >0)
case hd args {
"key" =>
(key, nil) := toint(hd tl args, 16);
if(askchan != dontask) {
s := minikey(key);
if (s == nil)
s[0] = key;
askkeys <-= s;
break;
}
keys := k.map(key);
if(keys != nil) {
send(ref Event.Edata(k.m.path, Mkeyb, keys));
}
"skey" => # minitel key hit (soft key)
if(hd tl args == "Exit") {
if(askchan != dontask) {
askchan = dontask;
askkeys <-= nil;
}
if(T.state == Online || T.state == Connecting) {
seq := keyseq("connect");
if(seq != nil) {
send(ref Event.Edata(k.m.path, Mkeyb, seq));
send(ref Event.Edata(k.m.path, Mkeyb, seq));
}
send(ref Event.Eproto(Pmodem, Mkeyb, Cdisconnect, "", 0,0,0));
}
send(ref Event.Equit(0, 0));
break;
}
if(askchan != dontask) {
askkeys <-= hd tl args;
break;
}
case hd tl args {
"Connect" =>
case T.state {
Local =>
if(M.connect == Network)
send(ref Event.Eproto(Pmodem, Mkeyb, Cconnect, "", 0,0,0));
else {
askchan = chan of string;
spawn ask(askkeys, askchan);
}
Connecting =>
send(ref Event.Eproto(Pmodem, Mkeyb, Cdisconnect, "", 0,0,0));
Online =>
seq := keyseq("connect");
if(seq != nil)
send(ref Event.Edata(k.m.path, Mkeyb, seq));
}
* =>
seq := keyseq(hd tl args);
if(seq != nil)
send(ref Event.Edata(k.m.path, Mkeyb, seq));
}
"click" => # fetch a word from the display
x := int hd tl args;
y := int hd tl tl args;
word := disp->GetWord(Point(x, y));
if(word != nil) {
if (askchan != dontask) {
askkeys <- = word;
break;
}
if (T.state == Local) {
if (canoncmd(word) == "connect") {
if(M.connect == Network)
send(ref Event.Eproto(Pmodem, Mkeyb, Cconnect, "", 0,0,0));
else {
askchan = chan of string;
spawn ask(askkeys, askchan);
}
break;
}
}
seq := keyseq(word);
if(seq != nil)
send(ref Event.Edata(k.m.path, Mkeyb, seq));
else {
send(ref Event.Edata(k.m.path, Mkeyb, array of byte word ));
send(ref Event.Edata(k.m.path, Mkeyb, keyseq("send")));
}
}
}
dialstr := <-askchan =>
askchan = dontask;
if(dialstr != nil) {
M.dialstr = dialstr;
send(ref Event.Eproto(Pmodem, Mkeyb, Cconnect, "", 0,0,0));
}
}
}
send(nil);
}
# Perform mode specific key translation
# returns nil on invalid keypress,
Keyb.map(nil: self ref Keyb, key: int): array of byte
{
# hardware to minitel keyboard mapping
cmd := minikey(key);
if (cmd != nil) {
seq := keyseq(cmd);
if(seq != nil)
return seq;
}
# alphabetic (with case mapping)
case T.mode {
Videotex =>
if(key >= 'A' && key <= 'Z')
return array [] of { byte ('a' + (key - 'A'))};
if(key >= 'a' && key <= 'z')
return array [] of {byte ('A' + (key - 'a'))};
Mixed or Ascii =>
if(key >= 'A' && key <= 'Z' || key >= 'a' && key <= 'z')
return array [] of {byte key};
};
# Numeric
if(key >= '0' && key <= '9')
return array [] of {byte key};
# Control-A -> Control-Z, Esc - columns 0 and 1
if(key >= 16r00 && key <=16r1f)
case T.mode {
Videotex =>
return nil;
Mixed or Ascii =>
return array [] of {byte key};
}
# miscellaneous key mapping
case key {
16r20 => ; # space
16ra3 => return array [] of { byte 16r19, byte 16r23 }; # pound
'!' or '"' or '#' or '$'
or '%' or '&' or '\'' or '(' or ')'
or '*' or '+' or ',' or '-'
or '.' or ':' or ';' or '<'
or '=' or '>' or '?' or '@' => ;
KF13 => # request for error correction - usually Fnct M + C
if((M.spec&Ecp) == 0 && T.state == Online && T.connect == Direct) {
fprint(stderr, "requesting Ecp\n");
return array [] of { byte SEP, byte 16r4a };
}
return nil;
* => return nil;
}
return array [] of {byte key};
}
Keyb.quit(k: self ref Keyb)
{
if(k==nil);
}
canoncmd(s : string) : string
{
s = tolower(s);
case s {
"connect" or "cx/fin" or
"connexion" or "fin" => return "connect";
"send" or "envoi" => return "send";
"repeat" or "repetition" => return "repeat";
"index" or "sommaire" or "somm"
=> return "index";
"guide" => return "guide";
"correct" or "correction" => return "correct";
"cancel" or "annulation" or "annul" or "annu"
=> return "cancel";
"next" or "suite" => return "next";
"previous" or "retour" or "retou"
=> return "previous";
}
return s;
}
# map softkey names to the appropriate byte sequences
keyseq(skey: string): array of byte
{
b2 := 0;
asterisk := 0;
if(skey == nil || len skey == 0)
return nil;
if(skey[0] == '*') {
asterisk = 1;
skey = skey[1:];
}
skey = canoncmd(skey);
case skey {
"connect" => b2 = 16r49;
"send" => b2 = 16r41;
"repeat" => b2 = 16r43;
"index" => b2 = 16r46;
"guide" => b2 = 16r44;
"correct" => b2 = 16r47;
"cancel" => b2 = 16r45;
"next" => b2 = 16r48;
"previous" => b2 = 16r42;
}
if(b2) {
if(asterisk)
return array [] of { byte '*', byte SEP, byte b2};
else
return array [] of { byte SEP, byte b2};
} else
return nil;
}
# map hardware or software keyboard presses to minitel functions
minikey(key: int): string
{
case key {
Kup or KupPC =>
return"previous";
Kdown or KdownPC =>
return "next";
Kenter =>
return "send";
Kback =>
return "correct";
Kesc =>
return "cancel";
KF1 =>
return "guide";
KF2 =>
return "connect";
KF3 =>
return "repeat";
KF4 =>
return "index";
* =>
return nil;
}
}