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qcrt.d
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1992-05-06
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#include:util.g
#include:crt.g
/*
* CRT library for Quest system.
*/
ushort
NLINES = 23, /* # lines on screen */
NCOLUMNS = 79, /* # columns on screen */
TEXTTOP = (NLINES + 1) / 2, /* 0-origin # of first text line */
STATUSLEFT = (NCOLUMNS + 1) / 2, /* 0-origin # of first status col */
MAPLINES = TEXTTOP - 1, /* # lines in map window */
MAPCOLUMNS = STATUSLEFT / 2 - 1; /* # columns in map window */
type
/* type of object, etc. id's: */
Id_t = ulong,
/* type of a map displayable object list: */
Object_t = struct {
*Object_t ob_next; /* ptr to next (behind this one) */
Id_t ob_id; /* object's id */
long ob_line, ob_column; /* world co-ords of object */
[2]char ob_chars; /* chars to display */
},
StatusKind_t = enum {st_number, st_string, st_multiple},
/* type of a status area object: */
Status_t = struct {
*Status_t st_next; /* ptr to next in list */
Id_t st_id; /* status object's id */
*char st_name; /* heading for status object */
ushort st_line, st_column; /* position in status area */
ushort st_length; /* length of display */
StatusKind_t st_kind; /* kind of this status object */
union {
*long n_ptr; /* pointer to value */
**char s_ptr; /* pointer to string */
proc(bool first)*char m_gen;/* value generator */
} st_;
};
Id_t ID_NULL = 0;
proc(long line, column)[2]char Scenery; /* user's scenery generator */
*char TextPrompt; /* current input prompt */
ushort
TextLine, /* current text line */
TextColumn, /* current text column */
TextLinePos, /* pos in TextBuff of next char */
TextWordPos; /* pos in TextBuff of "word" */
[NCOLUMNS] char TextBuff; /* the current output text line */
*Object_t Objects; /* list of objects, sorted by l, c */
long WindowLine, WindowColumn; /* co-ords of center of window */
*Status_t Statuses; /* list of display statuses */
/*
* _scAbort - abort with an error message.
*/
proc _scAbort(*char message)void:
CRT_ClearLine(NLINES - 1);
writeln(message);
CRT_Abort();
corp;
/*
* scInit - screen initialization.
*/
proc scInit()void:
ushort i;
CRT_Initialize("Quest V0.5", NLINES, NCOLUMNS);
TextPrompt := "";
TextLine := TEXTTOP;
TextColumn := 0;
TextLinePos := 0;
TextWordPos := 0;
Objects := nil;
Statuses := nil;
CRT_ClearScreen();
CRT_Move(MAPLINES, 0);
for i from 0 upto NCOLUMNS - 1 do
CRT_PutChar('-');
od;
for i from 0 upto MAPLINES - 1 do
CRT_Move(i, MAPCOLUMNS * 2 + 1);
CRT_PutChar('|');
od;
CRT_Move(TEXTTOP, 0);
corp;
/*
* scObjFree - free a list of objects
*/
proc scObjFree(*Object_t ob)void:
*Object_t obt;
while ob ~= nil do
obt := ob;
ob := ob*.ob_next;
free(obt);
od;
corp;
/*
* scTerm - terminate the entire run
*/
proc scTerm()void:
*Status_t st;
*Object_t ob;
scObjFree(Objects);
while Statuses ~= nil do
st := Statuses;
Statuses := st*.st_next;
free(st);
od;
CRT_Terminate();
corp;
/*
* _scFlush - flush the text line upto the given point.
*/
proc _scFlush(ushort pos)void:
ushort i;
CRT_Move(TextLine, 0);
i := 0;
while i ~= pos do
CRT_PutChar(TextBuff[i]);
i := i + 1;
od;
corp;
/*
* _scNextLine - go to the next line on text output.
*/
proc _scNextLine(bool needPause)void:
*char p;
ushort l;
TextLine := TextLine + 1;
if TextLine = NLINES then
TextLine := TEXTTOP;
if needPause then
p := "M O R E";
l := TEXTTOP;
CRT_EnterHighLight();
while
l := l + 1;
CRT_Move(l, NCOLUMNS - 1);
p* ~= '\e'
do
CRT_PutChar(p*);
p := p + 1;
od;
CRT_ExitHighLight();
pretend(CRT_ReadChar(), void);
fi;
CRT_ClearToEnd(TEXTTOP);
else
CRT_Move(TextLine, 0);
fi;
corp;
/*
* _scNewLine - a new line on text output.
*/
proc _scNewLine(bool needPause)void:
_scFlush(TextLinePos);
_scNextLine(needPause);
TextColumn := 0;
TextLinePos := 0;
TextWordPos := 0;
corp;
/*
* scPut - put a character to the text display area.
*/
proc scPut(char ch)void:
if ch = '\r' then
/* ignore it - assume it only comes with '\n' */
elif ch = '\n' then
_scNewLine(true);
else
if TextColumn >= NCOLUMNS - 1 then
if TextWordPos ~= 0 and ch ~= ' ' and ch ~= '\t' then
_scFlush(TextWordPos);
TextColumn := TextLinePos - TextWordPos;
BlockMove(pretend(&TextBuff[0], *byte),
pretend(&TextBuff[TextWordPos], *byte),
TextColumn);
TextWordPos := 0;
TextLinePos := TextColumn;
_scNextLine(true);
else
_scNewLine(true);
if ch = ' ' or ch = '\t' then
ch := '\e';
fi;
fi;
fi;
if ch ~= ' ' and ch ~= '\t' and TextLinePos ~= 0 and
(TextBuff[TextLinePos - 1] = ' ' or
TextBuff[TextLinePos - 1] = '\t') then
TextWordPos := TextLinePos;
fi;
if ch ~= '\e' then
TextBuff[TextLinePos] := ch;
TextLinePos := TextLinePos + 1;
TextColumn :=
if ch = '\t' then
(TextColumn + 8) & 0xf8
else
TextColumn + 1
fi;
fi;
fi;
corp;
/*
* scPrompt - set up the prompt to use for subsequent reads.
*/
proc scPrompt(*char prompt)void:
TextPrompt := prompt;
corp;
/*
* scRead - read an input line.
*/
proc scRead(*char buffer)void:
if TextLinePos ~= 0 then
_scNewLine(true);
else
CRT_Move(TextLine, 0);
fi;
CRT_PutChars(TextPrompt);
CRT_GetLine(buffer, NCOLUMNS - CharsLen(TextPrompt));
_scNewLine(false);
corp;
/*
* scNewMap - switch to a new "map" display.
*/
proc scNewMap(proc(long l, c)[2]char scenery;
*Object_t newList)*Object_t:
*Object_t oldList;
WindowLine := - range(long) - 1;
WindowColumn := - range(long) - 1;
oldList := Objects;
Objects := newList;
Scenery := scenery;
oldList
corp;
/*
* scWindow - window map region to another location.
*/
proc scWindow(long line, column)void:
*Object_t p;
long l, c;
[2]char pattern;
if line ~= WindowLine or column ~= WindowColumn then
p := Objects;
for l from line - MAPLINES / 2 upto line + (MAPLINES - 1) / 2 do
while p ~= nil and p*.ob_line < l do
p := p*.ob_next;
od;
CRT_Move(l - line + MAPLINES / 2, 0);
for c from column - MAPCOLUMNS / 2
upto column + (MAPCOLUMNS - 1) / 2 do
while p ~= nil and p*.ob_line = l and
p*.ob_column < c do
p := p*.ob_next;
od;
pattern :=
if p ~= nil and p*.ob_line = l and
p*.ob_column = c then
p*.ob_chars
else
Scenery(l, c)
fi;
CRT_PutChar(pattern[0]);
CRT_PutChar(pattern[1]);
od;
od;
WindowLine := line;
WindowColumn := column;
fi;
corp;
/*
* _scOnScreen - check for a position visible. Move there if so.
*/
proc _scOnScreen(long line, column)bool:
if line >= WindowLine - MAPLINES / 2 and
line <= WindowLine + (MAPLINES - 1) / 2 and
column >= WindowColumn - MAPCOLUMNS / 2 and
column <= WindowColumn + (MAPCOLUMNS - 1) / 2 then
CRT_Move(line - WindowLine + MAPLINES / 2,
(column - WindowColumn + MAPCOLUMNS / 2) * 2);
true
else
false
fi
corp;
/*
* _scInsert - insert an object into the location sorted list.
*/
proc _scInsert(*Object_t p; long line, column)void:
**Object_t pp;
p*.ob_line := line;
p*.ob_column := column;
pp := &Objects;
while pp* ~= nil and
(pp**.ob_line < line or
pp**.ob_line = line and pp**.ob_column < column) do
pp := &pp**.ob_next;
od;
p*.ob_next := pp*;
pp* := p;
if _scOnScreen(line, column) then
CRT_PutChar(p*.ob_chars[0]);
CRT_PutChar(p*.ob_chars[1]);
fi;
corp;
/*
* scNew - add a new object to the list of objects.
*/
proc scNew(Id_t id; long line, column; [2]char chars)void:
*Object_t p;
p := new(Object_t);
p*.ob_id := id;
p*.ob_chars := chars;
_scInsert(p, line, column);
corp;
/*
* _scFind - find and delete the given object.
*/
proc _scFind(Id_t id)*Object_t:
**Object_t pp;
*Object_t p;
pp := &Objects;
while pp* ~= nil and pp**.ob_id ~= id do
pp := &pp**.ob_next;
od;
if pp* = nil then
_scAbort("_scFind: object does not exist.")
fi;
p := pp*;
pp* := p*.ob_next;
p
corp;
/*
* scAt - return characters at this location.
*/
proc scAt(long line, column)[2]char:
*Object_t p;
p := Objects;
while p ~= nil and
(p*.ob_line < line or
p*.ob_line = line and p*.ob_column < column) do
p := p*.ob_next;
od;
if p ~= nil and p*.ob_line = line and
p*.ob_column = column then
p*.ob_chars
else
Scenery(line, column)
fi
corp;
/*
* _scUndo - make the current view of an object go away.
*/
proc _scUndo(Id_t id)*Object_t:
*Object_t p;
long line, column;
[2]char chars;
p := _scFind(id);
line := p*.ob_line;
column := p*.ob_column;
if _scOnScreen(line, column) then
chars := scAt(line, column);
CRT_PutChar(chars[0]);
CRT_PutChar(chars[1]);
fi;
p
corp;
/*
* scMove - move an object that is in the list of objects.
*/
proc scMove(Id_t id; long line, column)void:
_scInsert(_scUndo(id), line, column);
if id = ID_NULL and (
line <= WindowLine - MAPLINES / 2 or
line >= WindowLine + (MAPLINES - 1) / 2 or
column <= WindowColumn - MAPCOLUMNS / 2 or
column >= WindowColumn + (MAPCOLUMNS - 1) / 2) then
scWindow(line, column);
fi;
corp;
/*
* scDelete - delete an object.
*/
proc scDelete(Id_t id)void:
free(_scUndo(id));
corp;
/*
* _scUpdate - update the screen display of the status object.
*/
proc _scUpdate(*Status_t st)void:
*char ptr;
[12] char buffer;
long n;
ushort col, len, cnt;
bool isNeg, isFirst, quit;
col := st*.st_column + CharsLen(st*.st_name) + (STATUSLEFT + 2);
CRT_Move(st*.st_line, col);
len := st*.st_length;
case st*.st_kind
incase st_number:
ptr := &buffer[11];
ptr* := '\e';
n := st*.st_.n_ptr*;
if n < 0 then
isNeg := true;
else
n := -n;
isNeg := false;
fi;
while
if len ~= 0 then
len := len - 1;
fi;
ptr* := -(n % 10) + '0';
n := n / 10;
n ~= 0
do
ptr := ptr - 1;
od;
if isNeg then
if len ~= 0 then
len := len - 1;
fi;
ptr := ptr - 1;
ptr* := '-';
fi;
while len ~= 0 do
len := len - 1;
CRT_PutChar(' ');
od;
CRT_PutChars(ptr);
incase st_string:
ptr := st*.st_.s_ptr*;
while ptr* ~= '\e' and len ~= 0 do
len := len - 1;
CRT_PutChar(ptr*);
ptr := ptr + 1;
od;
while len ~= 0 do
len := len - 1;
CRT_PutChar(' ');
od;
incase st_multiple:
cnt := st*.st_line;
len := cnt + len - 1;
isFirst := true;
quit := false;
while
if quit then
false
else
ptr := st*.st_.m_gen(isFirst);
ptr ~= nil
fi
do
if isFirst then
isFirst := false;
else
CRT_PutChars(", ");
col := col + 2;
fi;
if col + CharsLen(ptr) + 2 >= NCOLUMNS - 1 then
if cnt = len then
quit := true;
CRT_PutChars("\b\b..");
else
CRT_ClearTail();
col := st*.st_column + (STATUSLEFT + 2);
cnt := cnt + 1;
CRT_Move(cnt, col);
fi;
fi;
if not quit then
CRT_PutChars(ptr);
col := CharsLen(ptr) + col;
fi;
od;
while
CRT_ClearTail();
cnt < len
do
cnt := cnt + 1;
CRT_Move(cnt, STATUSLEFT + 2);
od;
esac;
corp;
/*
* _scAdd - add a new status object.
*/
proc _scAdd(Id_t id; *char name; ushort line, column, length;
*Status_t st)void:
st*.st_next := Statuses;
st*.st_id := id;
st*.st_name := name;
st*.st_line := line;
st*.st_column := column;
st*.st_length := length;
Statuses := st;
CRT_Move(line, column + STATUSLEFT);
CRT_PutChars(name);
CRT_PutChars(": ");
_scUpdate(st);
corp;
/*
* scNumber - add a number status object.
*/
proc scNumber(Id_t id; *char name; ushort line, column, length;
*long ptr)void:
*Status_t st;
st := new(Status_t);
st*.st_kind := st_number;
st*.st_.n_ptr := ptr;
_scAdd(id, name, line, column, length, st);
corp;
/*
* scString - add a string status object.
*/
proc scString(Id_t id; *char name; ushort line, column, length;
**char ptr)void:
*Status_t st;
st := new(Status_t);
st*.st_kind := st_string;
st*.st_.s_ptr := ptr;
_scAdd(id, name, line, column, length, st);
corp;
/*
* scMult - add a multiple status object.
*/
proc scMult(Id_t id; *char name; ushort line, column, lines;
proc(bool first)*char gen)void:
*Status_t st;
st := new(Status_t);
st*.st_kind := st_multiple;
st*.st_.m_gen := gen;
_scAdd(id, name, line, column, lines, st);
corp;
/*
* scUpdate - update the specified status object.
*/
proc scUpdate(Id_t id)void:
*Status_t st;
st := Statuses;
while st ~= nil and st*.st_id ~= id do
st := st*.st_next;
od;
if st = nil then
_scAbort("scUpdate: bad status id.");
fi;
_scUpdate(st);
corp;
/*
* scRemove - remove the specified status object.
*/
proc scRemove(Id_t id)void:
**Status_t pst;
*Status_t st;
ushort len, line;
pst := &Statuses;
while pst* ~= nil and pst**.st_id ~= id do
pst := &pst**.st_next;
od;
if pst* = nil then
_scAbort("scRemove: bad status id.");
fi;
st := pst*;
pst* := st*.st_next;
CRT_Move(st*.st_line, st*.st_column + STATUSLEFT);
len := st*.st_length;
if st*.st_kind = st_multiple then
line := st*.st_line;
len := line + len - 1;
while
CRT_ClearTail();
line ~= len
do
line := line + 1;
CRT_Move(line, STATUSLEFT + 2);
od;
else
len := CharsLen(st*.st_name) + len + 2;
while len ~= 0 do
len := len - 1;
CRT_PutChar(' ');
od;
fi;
free(st);
corp;