DIRECTORY
IO,
Commander USING [ CommandProc, Register ],
Lark USING [ bStar, bThorp, CommandEvent, CommandEvents, CommandEventSequence, Device, disabled, DTMFEvent, enabled, endNum, Event, Passel, reset, StatusEvent, StatusEvents, SHHH ],
LarkOpsRpcControl,
LarkSmarts,
Nice,
RefID USING [ ID, Reseal ],
RPC USING [ CallFailed ], 
Rope USING [ ROPE ],
Process USING [ Detach, MsecToTicks, SetTimeout ],
ThPartyPrivate USING [ SmartsData ],
ThSmartsPrivate USING [
click, EnterLarkSt, --flushMarker, --GetSmartsInfo, --indexMarkerEnd, --LarkInfo, --LarkProseQueue, --LarkState, --maxClientMarker, pResetConfirmEnd, ProseControlDone, proseFailure, ReportProseDone, --RingDetState, SmartsInfo, spkrOn, --stopAndFlushEnd, --SwitchState, TonesDone ],
Thrush USING[ --ProseSpec,-- ROPE, SHHH, SmartsID ],
ThNet USING [ pd ],
VoiceUtils USING [ Report ]
;

LarkInImpl: CEDAR MONITOR LOCKS info USING info: LarkInfo
IMPORTS
LarkOpsRpcControl, Commander, --Convert,-- IO, Nice, Process, RefID, --Rope, --RPC, ThNet, ThSmartsPrivate, VoiceUtils
EXPORTS LarkSmarts, ThSmartsPrivate= {
OPEN IO;

Reseal: PROC[r: REF] RETURNS[RefID.ID] = INLINE {RETURN[RefID.Reseal[r]]; };
LarkInfo: TYPE = ThSmartsPrivate.LarkInfo;
RingDetState: TYPE = ThSmartsPrivate.RingDetState;
SmartsData: TYPE = ThPartyPrivate.SmartsData;
SmartsInfo: TYPE = ThSmartsPrivate.SmartsInfo;
SmartsID: TYPE = Thrush.SmartsID;
SwitchState: TYPE = ThSmartsPrivate.SwitchState;
ROPE: TYPE = Thrush.ROPE;
bStar: Lark.Event = Lark.bStar;
bThorp: Lark.Event = Lark.bThorp;
enabled: Lark.Event = Lark.enabled;
endNum: Lark.Event = Lark.endNum;
disabled: Lark.Event = Lark.disabled;
reset: Lark.Event = Lark.reset;

PD: TYPE = RECORD [
callTimeoutOK: BOOL_FALSE, -- set to keep Thrush alive when debugging a Lark.
debounceInterval: INTEGER _ 300, -- ms.
spClickInterval: INTEGER _ 300,
breakInterval: INTEGER _ 4500, -- ms., 4 sec. nominal, 500 ms. benefit of doubt
crowbar: BOOL_FALSE -- TRUE to check Lark command timeout.
];

pd: REF PD _ NEW[PD_[]];



DebEvent: PROC[info: SmartsInfo, ev: Lark.StatusEvent] = INLINE {
s: IO.STREAM=IO.ROS[];
s.PutF["[%3B, %3B, ",
card[LONG[
IF info#NIL THEN LOOPHOLE[info.larkInfo.netAddress.host,CARDINAL]
ELSE LOOPHOLE[777B, CARDINAL]]],
card[LONG[LOOPHOLE[ev.device, CARDINAL]]]]; 
IF ev.event<='z THEN s.PutF["%g]  ",char[ev.event]]
ELSE s.PutF["<%3B>]  ", card[LONG[LOOPHOLE[ev.event, CARDINAL]]]];
VoiceUtils.Report[s.RopeFromROS[], $LarkDetailed, info.larkInfo];
};

RecordEvent: PUBLIC PROC[shh: Thrush.SHHH, smartsID: Thrush.SmartsID, whatHappened: Lark.StatusEvents]
RETURNS [ success: BOOL_TRUE ]
= {
smartsInfo: SmartsInfo = ThSmartsPrivate.GetSmartsInfo[smartsID: smartsID];
parseInfo: SmartsInfo _ smartsInfo;
info: LarkInfo;
parseSmartsID: SmartsID;
IF smartsInfo=NIL OR (info _ smartsInfo.larkInfo)=NIL THEN RETURN[FALSE];
parseSmartsID _ smartsInfo.smartsID;
FOR i: Lark.Passel IN [0 .. whatHappened.length) DO
sEvent: Lark.StatusEvent _ whatHappened[i];
IF ThNet.pd.debug THEN DebEvent[smartsInfo, sEvent];
IF crowbar OR info.larkState=failed THEN LOOP;
SELECT sEvent.device FROM
speakerSwitch => sEvent _ InterpretSpeakerSwitch[info, sEvent];
ringDetect => {
parseSmartsID _ smartsInfo.otherSmartsID;
parseInfo _ ThSmartsPrivate.GetSmartsInfo[smartsID: parseSmartsID];
sEvent _ InterpretRingDetect[info, sEvent];
};
tones => {
ThSmartsPrivate.TonesDone[smartsInfo.larkInfo, sEvent];
LOOP;
};
touchPad => {
IF sEvent.event=disabled THEN sEvent.event _ smartsInfo.lastTouchpadChar
ELSE {
smartsInfo.lastTouchpadChar _ sEvent.event; LOOP; -- down transitions of DTMF pad.
};
IF sEvent.event='\000 THEN LOOP;
};
keyboard => {
IF info.keyboardEventHandler#NIL THEN info.keyboardEventHandler[info, sEvent];
LOOP;
};
hookSwitch => NULL;
ENDCASE => ERROR;
IF sEvent.device=nothing THEN LOOP;
parseInfo.ParseEvent[ smartsInfo: parseInfo, sEvent: sEvent ];
ENDLOOP; };

EventRope: PUBLIC PROC[
shh: Thrush.SHHH, smartsID: SmartsID, time: CARDINAL, device: Lark.Device, events: ROPE]
RETURNS[success: BOOL] = {
NULL;
};

InterpretSpeakerSwitch: ENTRY PROC[info: LarkInfo, sEvent: Lark.StatusEvent]
RETURNS [ processedEvent: Lark.StatusEvent] = {
interval: INTEGER = LOOPHOLE[sEvent.time-info.swOnTime];
processedEvent _ sEvent;
info.swOnTime _ sEvent.time;
SELECT sEvent.event FROM
enabled => {
TRUSTED { Process.Detach[FORK SpeakerSwitchTimeout[info, info.swOnTime]]; };
processedEvent.device _ nothing;
RETURN;
};
disabled => IF interval >= 0 AND interval <= pd.spClickInterval THEN
processedEvent.event _ ThSmartsPrivate.click;
ThSmartsPrivate.spkrOn => RETURN; -- a timed-out ON event, which is now being reported
ENDCASE => ERROR;
};

SpeakerSwitchTimeout: PROC[info: LarkInfo, onTime: CARDINAL] = {
SSTE: ENTRY PROC[info: LarkInfo, onTime: CARDINAL] RETURNS [doIt: BOOL] = TRUSTED {
wait: CONDITION;
Process.SetTimeout[@wait, Process.MsecToTicks[pd.spClickInterval]];
WAIT wait;
RETURN[onTime=info.swOnTime];
};
IF ~SSTE[info, onTime] THEN RETURN; -- click happened or something, forget it.
info.larkSmartsInfo.ParseEvent[info.larkSmartsInfo,
[onTime+pd.spClickInterval, speakerSwitch, ThSmartsPrivate.spkrOn ] ];

};

InterpretRingDetect: ENTRY PROC[info: LarkInfo, sEvent: Lark.StatusEvent]
RETURNS [ processedEvent: Lark.StatusEvent _ [ 0, nothing, Lark.reset ] ] = {
ENABLE UNWIND=>NULL;
interval: INTEGER = LOOPHOLE[sEvent.time-info.ringChangeTime];
event: Lark.Event = sEvent.event;
timeout: BOOL _ FALSE;
info.ringChangeTime _ sEvent.time;
SELECT event FROM 
enabled => SELECT info.ringDetState FROM idle, between=>NULL; ENDCASE=>RETURN;
disabled => SELECT info.ringDetState FROM idle, between=>RETURN; ENDCASE;
ENDCASE=>RETURN;
SELECT info.ringDetState FROM
idle => info.ringDetState _ maybe;
between => { info.ringDetState _ ring; processedEvent _ sEvent; }; -- generate new offhook
maybe => IF interval<pd.debounceInterval THEN info.ringDetState_idle ELSE RETURN;
ring => info.ringDetState _ between;
ENDCASE;
info.ringDetInstance _ info.ringDetInstance+1;
BROADCAST info.ringDetCondition; -- earlier timeouts zap themselves.
IF info.ringDetState = $idle THEN RETURN;
TRUSTED { Process.Detach[FORK RingTimeout[info, info.ringDetInstance]]; };
};


RingTimeout: PROC[info: LarkInfo, instance: INT] = {
RTEntry: ENTRY PROC[info: LarkInfo] RETURNS[event: Lark.Event_reset] = TRUSTED { -- Process is unsafe
ENABLE UNWIND=>NULL;
timeout: INTEGER _ pd.breakInterval;
IF instance#info.ringDetInstance THEN RETURN;
SELECT info.ringDetState FROM
$idle => RETURN;
$maybe => timeout _ pd.debounceInterval;
ENDCASE;
Process.SetTimeout[@info.ringDetCondition, Process.MsecToTicks[timeout]];
WAIT info.ringDetCondition;
IF info.ringDetInstance#instance THEN RETURN; -- events intervened
SELECT info.ringDetState FROM -- timed out
$idle => RETURN; -- ??
$maybe => { event _ enabled; info.ringDetState _ $ring; }; -- now ringing
ENDCASE => { event _ disabled; info.ringDetState _ $idle; }; -- too long
};
event: Lark.Event _ RTEntry[info];
IF event # reset THEN
info.larkTrunkSmartsInfo.ParseEvent[
info.larkTrunkSmartsInfo, [info.ringChangeTime, ringDetect, event ] ];
IF event = enabled THEN RingTimeout[info, instance]; -- wait for no-longer-ringing timeout
};

InterpretHookState: PUBLIC ENTRY PROC
[ info: LarkInfo, rawEvent: Lark.StatusEvent, sInfo: SmartsInfo ]
RETURNS [ processedEvent: Lark.StatusEvent ] = {
ENABLE UNWIND=>NULL;
event: Lark.Event = rawEvent.event;
ev: EvType;
newState: SwitchState;
oldState: SwitchState_info.switchState;
ev _ SELECT rawEvent.device FROM
hookSwitch => SELECT event FROM
Lark.enabled => tsOn,
Lark.disabled => tsOff,
ENDCASE=> spNone,
speakerSwitch => SELECT event FROM
ThSmartsPrivate.spkrOn => spOn,
Lark.disabled => spOff,
ThSmartsPrivate.click => spClick,
ENDCASE => spNone,
ENDCASE => spNone;
processedEvent _ rawEvent;
IF ev = spNone THEN {
processedEvent.event _ SELECT rawEvent.device FROM
touchPad => SELECT event FROM
bThorp => endNum,
bStar => '*,
IN Lark.DTMFEvent => event - (FIRST[Lark.DTMFEvent]-'0),
ENDCASE=>event,
ENDCASE => event;
RETURN;
};

newState _ newStates[oldState][ev];
info.switchState _ newState;
processedEvent.device _ hookSwitch;
IF newState=oldState THEN processedEvent.device_nothing -- no op?
ELSE IF newState = $onhook THEN processedEvent.event _ disabled -- really going onhook
ELSE {
IF oldState = $onhook THEN processedEvent.event _ enabled -- really going offhook
ELSE processedEvent.device_nothing;
ThSmartsPrivate.EnterLarkSt[info, info.larkState];
};
};


CheckHookState: PUBLIC ENTRY PROC
[info: LarkInfo ] RETURNS [ onHook: BOOL_TRUE ] = {
ENABLE RPC.CallFailed => IF pd.callTimeoutOK THEN RESUME ELSE GOTO Failed;
reverted, wasReverted: BOOL_FALSE;
which: CARDINAL;
DO
which_0;
reverted _ FALSE;
DO
events: Lark.StatusEvents;
[which, events] _ info.interface.WhatIsStatus[info.shh, which];
FOR i: NAT IN [0..events.length) DO
SELECT events[i].event FROM
enabled => SELECT events[i].device FROM
hookSwitch => {
onHook_FALSE;
info.interface.Commands[shh: info.shh, events: assertARelay];
};
revertHookswitch => IF ~wasReverted THEN reverted _ wasReverted _ TRUE;
ENDCASE;
ENDCASE;
ENDLOOP;
IF which=0 THEN EXIT;
ENDLOOP;
IF reverted THEN {
info.interface.Commands[shh: info.shh, events: unRevHS];
LOOP;
};
EXIT;
ENDLOOP;
EXITS
Failed => onHook_FALSE;
};

EvType: TYPE = { tsOff, tsOn, spOff, spOn, spClick, spNone };
newStates: ARRAY SwitchState OF ARRAY EvType OF SwitchState _ [
[ $onhook,  $telset,  $onhook,  $sPEAKER, $speaker, $onhook  ], -- onhook
[ $onhook,  $telset,  $telset,  $mONITOR, $monitor, $telset  ], -- telset
[ $speaker, $telset,  $onhook,  $sPEAKER, $onhook,  $speaker ], -- speaker
[ $sPEAKER, $mONITOR, $onhook,  $sPEAKER, $onhook,  $sPEAKER ], -- sPEAKER
[ $speaker, $monitor, $telset,  $mONITOR, $telset,  $monitor ], -- monitor
[ $sPEAKER, $mONITOR, $telset,  $mONITOR, $telset,  $mONITOR ]  -- mONITOR
];

ViewCmd: Commander.CommandProc = TRUSTED {
Nice.View[pd, "Lark In PD"];
};

unRevHS: Lark.CommandEvents _ NEW[Lark.CommandEventSequence[1]];
assertARelay: Lark.CommandEvents _ NEW[Lark.CommandEventSequence[1]];
unRevHS[0] _ [revertHookswitch, disabled];
assertARelay[0] _ [aRelay, enabled];

Commander.Register["VuLarkIn", ViewCmd, "Program Management variables for Lark Input"];
}.
φLarkInImpl.mesa 
Copyright c 1985, 1986 by Xerox Corporation.  All rights reserved.
Last modified by D. Swinehart, November 25, 1986 4:00:06 pm PST
Polle Zellweger (PTZ) August 29, 1985 5:46:32 pm PDT
Convert USING [ IntFromRope ],
Rope USING [ Concat, FromChar, ROPE ],
*****************  External  Procedures  ********************
Handles smarts-independent filtering, events that need timing.
Interpret event, possibly filter some out.
React to upstrokes, not downstrokes.  0-key Rollover is a side-effect.  Try it.

There should probably be a generalized registration for input events, so that other things could register special input from Lark situations.  Right now text-to-speech synthesizers form the only example, and there's only one of them, so the registration is limited to this case.
Generates one "enabled" for every ring detect (with a delay for possible glitches the first time), and a single "disabled" when the last ring has been gone too long.  See ThSmartsPrivate.LarkInfo.
Bold states occur only when event is enabled, others only when disabled
ELSE: The debounce timeout will soon occur and generate the offhook event
Filters only events whose device codes are hookswitch and speakerSwitch
Implements another state machine via SELECT
Translate characters from various devices into common set
When newState is onhook, the lark state will soon be idle, and this is just a distraction.
Determine if either of telset or speakerphone is activated.
Assert aRelay and unrevert hookswitch
SwitchState: TYPE = { onhook, telset, speaker, sPEAKER, monitor, mONITOR };

spOn is transition away from middle on speaker switch that lasts more than a few hundred ms.
spOff is transition to middle when spOn.
spClick is transition away from and back to middle after a few hundred ms.
Note: spNone is used to indicate that no interesting action took place.

See ThSmartsPrivate.SwitchState for the legal state transitions; others are made harmless here.
Scenario: user picks up telset and talks for a while, then clicks the speaker switch; the speaker comes on but the telset is still active.  Hanging up switches to $speaker mode; picking up the telset reverts to $telset mode, whence hanging up would terminate the conversation unless the user clicks the switch again.
Scenario: user picks up telset and talks for a while, then turns on the speaker switch; the speaker comes on but the telset is still active.  Hanging up switches to $sPEAKER mode; picking up the telset reverts to $mONITOR mode, and hanging up alternates back to sPEAKER mode, since the switch is still on.
When calls are terminated from Finch or the other party, the terminal state goes $onhook anyhow, so the distinctions between switch-on modes and click modes are not as great as they once were.
Swinehart, August 6, 1985 12:10:40 pm PDT
Incorporate PTZ changes
changes to: DIRECTORY, LarkInImpl, RecordEvent, HandleProseOutput, InterpretSpeakerSwitch
Polle Zellweger (PTZ) August 7, 1985 6:36:35 pm PDT
Comments only.
changes to: EvType, newStates
Polle Zellweger (PTZ) August 22, 1985 5:20:05 pm PDT
Handle Prose flushing; remove deadlock from HandleProseOutput.
changes to: DIRECTORY, RecordEvent, HandleProseOutput, HandleAndReport
Polle Zellweger (PTZ) August 23, 1985 2:10:02 pm PDT
Input events from the Prose Lark are being interpreted as smarts-level parseable events.  Raise error for odd devices.
changes to: RecordEvent
Polle Zellweger (PTZ) August 23, 1985 2:34:28 pm PDT
changes to: RecordEvent, HandleProseOutput
Polle Zellweger (PTZ) August 27, 1985 8:57:45 pm PDT
Allow for Prose Reset command.
changes to: DIRECTORY, HandleProseOutput
Polle Zellweger (PTZ) August 29, 1985 5:46:33 pm PDT
changes to: HandleProseOutput
Swinehart, October 28, 1985 11:54:20 am PST
Handle => ID, Log => VoiceUtils
changes to: DIRECTORY, LarkInImpl, Reseal, SmartsID, RecordEvent, EventRope, HandleProseOutput, InterpretSpeakerSwitch, InterpretRingDetect, RingDetProc, InterpretHookState, ProblemBool
Swinehart, November 29, 1985 11:17:56 am PST
When going on hook, don't react to changes in terminal type, since the terminal will soon be put idle by other actions.
changes to: InterpretHookState
Swinehart, April 10, 1986 11:55:03 am PST
Simplify and improve speaker and telset switch handling, add monitor mode as first-class citizen
changes to: DIRECTORY, Reseal, SmartsID, SwitchState, ROPE, PD, InterpretSpeakerSwitch, SpeakerSwitchTimeout, SSTE (local of SpeakerSwitchTimeout), InterpretHookState, EvType, newStates
Swinehart, May 25, 1986 10:10:16 pm PDT
Lark => LarkOps
changes to: DIRECTORY, LarkInImpl

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