DIRECTORY
Imager, ImagerFont, ImagerSample, 
IO, 
Pipal, PipalInt, PipalMutate, PipalPaint, PipalReal, PipalTextMutant, 
Real, Rope, SF, VFonts;

PipalTextMutantImpl: CEDAR PROGRAM
IMPORTS Imager, ImagerFont, ImagerSample, IO, Pipal, PipalInt, PipalMutate, PipalPaint, PipalReal, Real, Rope, VFonts
EXPORTS PipalTextMutant =
BEGIN OPEN PipalTextMutant;
pipalTextClass: PUBLIC Pipal.Class _ Pipal.RegisterClass[name: "PipalText", type: CODE[PipalTextRec]];

TextDescribe: Pipal.DescribeProc = {
text: PipalText _ NARROW [object];
Pipal.PutIndent[out, indent, cr];
IO.PutF[out, "Text [%g]", IO.rope[text.rope]]; 
};

TextSize: PipalReal.SizeProc ~ {
size _ NARROW [object, PipalText].size;
};

fixedFont: Imager.Font _ VFonts.defaultFont;
feedbackHeight: REAL _ 4.0;
fontHeight: REAL _ ImagerFont.FontBoundingBox[fixedFont].descent + ImagerFont.FontBoundingBox[fixedFont].ascent;
lineHeight: REAL _ fontHeight + feedbackHeight;

TextPaint: PipalPaint.PaintProc ~ {
clip: PipalReal.Rectangle _ PipalPaint.GetBounds[context];
EachRow: RowProc = {
IF NOT PipalReal.DoRectanglesIntersect[clip, [[0.0, y], [text.size.x, lineHeight]]] THEN RETURN;
Imager.SetXY[context, [0.0, y]];
Imager.ShowRope[context, text.rope, interval.base, interval.size];
};
text: PipalText _ NARROW[object];
PipalPaint.SetColor[context, Imager.black];
Imager.SetFont[context, fixedFont];
[] _ EnumerateRows[text, EachRow];
};

emptySize: PipalReal.Size _ PipalReal.emptySize;

CreatePipalText: PUBLIC PROC [rope: Pipal.ROPE, size: PipalReal.Size _ PipalReal.emptySize] RETURNS [text: PipalText] = {
text _ NEW [PipalTextRec _ [rope, size]];
IF size=PipalReal.emptySize THEN {
extents: ImagerFont.Extents _ ImagerFont.RopeBoundingBox[font: fixedFont, rope: rope];
text.size _ [extents.leftExtent+extents.rightExtent, lineHeight];
};
};

GetIntervalArea: PUBLIC PROC [text: PipalText, interval: PipalInt.Interval] RETURNS [rectangle: PipalReal.Rectangle] = {
interest: PipalInt.Interval _ interval;
EachRow: RowProc = {
IF NOT PipalInt.DoIntervalsIntersect[interest, interval] THEN RETURN;
rectangle _ PipalReal.BoundingBox[rectangle, [[0.0, y], [text.size.x, lineHeight]]];
};
rectangle _ PipalReal.emptyRectangle;
[] _ EnumerateRows[text, EachRow];
};

GetSelectionInterval: PUBLIC PROC [text: PipalText, position: PipalReal.Position, grain: SelectionGrain] RETURNS [interval: PipalInt.Interval _ [0, 0], closerRight: BOOL _ FALSE] = {
ropeSize: INT _ Rope.Size[text.rope];
IF ropeSize>0 THEN {
leftEdge, rightEdge: REAL _ 0.0;
location: Location;
bbox: PipalReal.Rectangle;
[location, bbox] _ CharLocation[text, position];
leftEdge _ bbox.base.x;
rightEdge _ bbox.base.x+bbox.size.x;
SELECT grain FROM
point => {
interval.base _ location;
interval.size _ 0;
};
char => {
interval.base _ location;
interval.size _ 1;
};
word => {
start: Location _ location;
char: CHAR _ Rope.Fetch[text.rope, location];
IF CharSeparator[char] THEN interval.base _ location
ELSE {
UNTIL location=0 OR CharSeparator[(char _ Rope.Fetch[text.rope, location-1])] DO
location _ location-1;
leftEdge _ leftEdge-CharSize[char].x;
ENDLOOP;
interval.base _ location;
location _ start;
UNTIL location=ropeSize-1 OR CharSeparator[(char _ Rope.Fetch[text.rope, location+1])] DO
location _ location+1;
rightEdge _ rightEdge+CharSize[char].x;
ENDLOOP;
};
interval.size _ location-interval.base+1;
};
ENDCASE => ERROR;
closerRight _ ABS[rightEdge-position.x]<ABS[position.x-leftEdge];
};
};

CharLocation: PROC [text: PipalText, position: PipalReal.Position] RETURNS [location: Location, bbox: PipalReal.Rectangle] = {
EachChar: CharProc = {
distance: REAL _ RectanglePointDistance[bbox, position];
IF (quit _ PipalReal.IsInsidePoint[bbox, position]) OR distance<closest THEN {
loc _ location;
bb _ bbox;
closest _ distance;
};
};
loc: Location _ 0;
bb: PipalReal.Rectangle _ PipalReal.emptyRectangle;
closest: REAL _ PipalReal.infinity;
[] _ EnumerateChars[text, EachChar];
location _ loc;
bbox _ bb;
};

CharProc: TYPE = PROC [char: CHAR, location: Location, bbox: PipalReal.Rectangle] RETURNS [quit: BOOL _ FALSE];
EnumerateChars: PROC [text: PipalText, eachChar: CharProc] RETURNS [quit: BOOL _ FALSE] = {
EachRow: RowProc = {
quit _ EnumerateCharsInRow[text, interval, y, eachChar];
};
quit _ EnumerateRows[text, EachRow];
};

EnumerateCharsInRow: PROC [text: PipalText, interval: PipalInt.Interval, y: REAL, eachChar: CharProc] RETURNS [quit: BOOL _ FALSE] = {
x: REAL _ 0.0;
FOR loc: Location IN [interval.base..interval.base+interval.size) DO
char: CHAR _ Rope.Fetch[text.rope, loc];
cx: REAL _ CharSize[char].x;
IF eachChar[char, loc, [[x, y-feedbackHeight], [cx, lineHeight]]] THEN {quit _ TRUE; EXIT};
x _ x + cx;
ENDLOOP;
};

CharSize: PROC [char: CHAR] RETURNS [size: PipalReal.Size] = {
size _ [ImagerFont.Escapement[fixedFont, [0, LOOPHOLE[char]]].x, lineHeight]
};

RowProc: TYPE = PROC [interval: PipalInt.Interval, y: REAL] RETURNS [quit: BOOL _ FALSE];
EnumerateRows: PROC [text: PipalText, eachRow: RowProc] RETURNS [quit: BOOL _ FALSE] = {
start: Location _ 0;
y: REAL _ text.size.y-lineHeight+feedbackHeight;
length: INT _ Rope.Length[text.rope];
IF length>0 THEN DO
rightEdge: REAL _ 0.0;
firstUnpaintedChar: Location _ start;
lastSeparator: Location _ start;
DO
char: CHAR _ Rope.Fetch[text.rope, firstUnpaintedChar];
rightEdge _ rightEdge + CharSize[char].x;
IF rightEdge>=text.size.x THEN EXIT;
IF CharSeparator[char] THEN lastSeparator _ firstUnpaintedChar;
firstUnpaintedChar _ firstUnpaintedChar + 1;
IF firstUnpaintedChar=length THEN EXIT;
ENDLOOP;
IF firstUnpaintedChar=length THEN lastSeparator _ length-1;
IF eachRow[[start, lastSeparator-start+1], y] THEN {quit _ TRUE; EXIT};
IF lastSeparator+1=length THEN EXIT;
start _ lastSeparator+1;
y _ y-lineHeight;
ENDLOOP;
};

CharSeparator: PROC [char: CHAR] RETURNS [separator: BOOL] = {
separator _  NOT (char IN ['a..'z] OR char IN ['A..'Z] OR char IN ['0..'9]);
};


textMutantClass: PUBLIC Pipal.Class _ Pipal.RegisterClass[name: "TextMutant", type: CODE [TextMutantRec]];

TextMutantDescribe: Pipal.DescribeProc = {
textMutant: TextMutant _ NARROW[object];
Pipal.PutIndent[out, indent, cr];
IO.PutF[out, "Text Mutant"]; 
};

TextMutantSize: PipalReal.SizeProc ~ {
size _ PipalReal.ObjectSize[NARROW [object, TextMutant].text];
};

caretH: INTEGER = 6;
caretW: INTEGER = 16;

CaretBits: TYPE ~ REF CaretBitsRep;
CaretBitsRep: TYPE = ARRAY [0..caretH) OF WORD;

caretBits: CaretBits _ NEW[CaretBitsRep _ [
000400B, -- 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0
001600B, -- 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0
003700B, -- 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0
003300B, -- 0 0 0 0 0 1 1 0 1 1 0 0 0 0 0 0
006140B, -- 0 0 0 0 1 1 0 0 0 1 1 0 0 0 0 0
004040B  -- 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0
]];

caretMap: ImagerSample.SampleMap _ SampleMapFromCaretBits[caretBits];

SampleMapFromCaretBits: PROC [bits: CaretBits] RETURNS [ImagerSample.SampleMap] ~ TRUSTED {
RETURN [ImagerSample.UnsafeNewSampleMap[
box: [min: [s: 0, f: 0], max: [s: caretH, f: caretW]], 
bitsPerSample: 1, bitsPerLine: BITS[WORD], base: [word: LOOPHOLE[bits], bit: 0], 
ref: bits, words: SIZE[CaretBitsRep]
]];
};

TextMutantPaint: PipalPaint.PaintProc = {
EachRow: RowProc = {
y _ y-feedbackHeight;
FOR selection: Selections IN Selections DO
IF tm.selections[selection].valid AND PipalInt.DoIntervalsIntersect[interval, tm.selections[selection].interval] THEN {
sel: Selection _ tm.selections[selection];
selectInterval: PipalInt.Interval _ PipalInt.IntersectionIntervals[interval, sel.interval];
start: REAL _ ImagerFont.RopeEscapement[fixedFont, text.rope, interval.base, selectInterval.base-interval.base].x;
SELECT TRUE FROM
selection=primary => Imager.SetColor[context, PipalPaint.invertingBlack];
sel.pendingDelete => Imager.SetColor[context, PipalPaint.invertingLightGray];
ENDCASE => Imager.SetColor[context, PipalPaint.invertingDarkGray];
IF selectInterval.size>0 THEN {
length: REAL _ ImagerFont.RopeEscapement[fixedFont, text.rope, selectInterval.base, selectInterval.size].x;
IF sel.pendingDelete THEN Imager.MaskRectangle[context, [start, y, length, fontHeight]]
ELSE Imager.MaskRectangle[context, [start, y, length, feedbackHeight]];
IF (sel.caretAfter AND PipalInt.IsInsideIntervalNumber[selectInterval, sel.interval.base+sel.interval.size]) OR (NOT sel.caretAfter AND PipalInt.IsInsideIntervalNumber[selectInterval, sel.interval.base]) THEN Imager.MaskBitmap[context, caretMap, [0, 7], Imager.defaultScanMode, [IF sel.caretAfter THEN start+length ELSE start, y+feedbackHeight]];
}
ELSE Imager.MaskBitmap[context, caretMap, [0, 7], Imager.defaultScanMode, [start, y+feedbackHeight]];
};
ENDLOOP;
};
tm: TextMutant _ NARROW [object];
text: PipalText _ tm.text;
PipalPaint.Paint[text, context];
Imager.SetStrokeWidth[context, feedbackHeight];
[] _ EnumerateRows[text, EachRow];
};

MutatePipalText: PipalMutate.MutationProc = {
text: PipalText _ NARROW [object];
mutant _ NEW [TextMutantRec _ [text: text]];
};
InsertRope: PUBLIC PROC [tm: TextMutant, characters: Pipal.ROPE] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
[changed, newtm] _ BasicInsert[tm, characters];
message _ "insert rope";
};

InsertChar: PUBLIC PROC [tm: TextMutant, character: CHAR] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
[changed, newtm] _ BasicInsert[tm, Rope.FromChar[character]];
message _ "insert char";
};

Copy: PUBLIC PROC [tm: TextMutant] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
IF tm.selections[secondary].valid THEN {
otherChange: PipalInt.Interval;
[changed, newtm] _ BasicInsert[tm, Rope.Substr[tm.text.rope, tm.selections[secondary].interval.base, tm.selections[secondary].interval.size]];
IF newtm.selections[secondary].pendingDelete THEN {
[otherChange, newtm] _ BasicDelete[newtm, newtm.selections[secondary].interval];
changed _ PipalInt.UnionIntervals[changed, otherChange];
};
}
ELSE ERROR Pipal.Error[$noSecondarySelection];
message _ "copy";
};

Transpose: PUBLIC PROC [tm: TextMutant] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
text: PipalText _ tm.text;
newtm _ NEW [TextMutantRec _ tm^];
IF NOT tm.selections[primary].valid THEN ERROR Pipal.Error[$noPrimarySelection];
IF NOT tm.selections[secondary].valid THEN ERROR Pipal.Error[$noSecondarySelection];
{
i1: PipalInt.Interval;
i2: PipalInt.Interval;
switched: BOOL;
[i1, i2, switched] _ DecomposeIntervals[tm.selections[primary].interval, tm.selections[secondary].interval];
newtm.text _ CreatePipalText[Rope.Cat[
Rope.Substr[text.rope, 0, i1.base],
Rope.Substr[text.rope, i2.base, i2.size],
Rope.Substr[text.rope, i1.base+i1.size, i2.base-(i1.base+i1.size)],
Rope.Substr[text.rope, i1.base, i1.size],
Rope.Substr[text.rope, i2.base+i2.size, Rope.Length[text.rope]-i2.base+i2.size]], text.size];
changed _ [i1.base, PipalInt.infinity];
{
difference: INT _ tm.selections[primary].interval.size - tm.selections[secondary].interval.size;
t: Location _ tm.selections[primary].interval.base;
newtm.selections[primary].interval.base _ newtm.selections[secondary].interval.base;
newtm.selections[secondary].interval.base _ t;
IF switched THEN newtm.selections[secondary].interval.base _ newtm.selections[secondary].interval.base + difference
ELSE newtm.selections[primary].interval.base _ newtm.selections[primary].interval.base - difference;
};
};
message _ "transpose";
};

Delete: PUBLIC PROC [tm: TextMutant] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
newtm _ NEW [TextMutantRec _ tm^];
IF NOT tm.selections[primary].valid THEN ERROR Pipal.Error[$noPrimarySelection];
newtm.paste _ Rope.Substr[tm.text.rope, tm.selections[primary].interval.base, tm.selections[primary].interval.size];
[changed, newtm] _ BasicDelete[newtm, tm.selections[primary].interval];
message _ "delete";
};

Paste: PUBLIC PROC [tm: TextMutant] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
[changed, newtm] _ BasicInsert[tm, tm.paste];
message _ "paste";
};

Erase: PUBLIC PROC [tm: TextMutant] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
sel: Selection _ tm.selections[primary];
loc: Location;
IF NOT sel.valid THEN ERROR Pipal.Error[$noPrimarySelection];
loc _ IF sel.caretAfter THEN sel.interval.base+sel.interval.size ELSE sel.interval.base;
IF loc=0 THEN ERROR Pipal.Error[$noCharacterToErase];
[changed, newtm] _ BasicDelete[tm, [loc-1, 1]];
message _ "erase";
};

BasicInsert: PROC [oldtm: TextMutant, characters: Pipal.ROPE] RETURNS [changed: PipalInt.Interval, newtm: TextMutant] = {
size: Location _ Rope.Size[characters];
loc: Location;
changed _ [PipalInt.infinity/2, 0];
IF NOT oldtm.selections[primary].valid THEN ERROR Pipal.Error[$noPrimarySelection];
IF oldtm.selections[primary].pendingDelete THEN {
paste: Rope.ROPE _ Rope.Substr[oldtm.text.rope, oldtm.selections[primary].interval.base, oldtm.selections[primary].interval.size];
[changed, newtm] _ BasicDelete[oldtm, oldtm.selections[primary].interval];
newtm.paste _ paste;
}
ELSE newtm _ NEW [TextMutantRec _ oldtm^];
loc _ IF newtm.selections[primary].caretAfter THEN newtm.selections[primary].interval.base + newtm.selections[primary].interval.size ELSE newtm.selections[primary].interval.base;
newtm.text _ CreatePipalText[Rope.Cat[
Rope.Substr[newtm.text.rope, 0, loc],
characters,
Rope.Substr[newtm.text.rope, loc, Rope.Size[newtm.text.rope]-loc]], newtm.text.size];
changed _ PipalInt.UnionIntervals[changed, [loc, size+Rope.Size[newtm.text.rope]-loc]];
FOR selection: Selections IN Selections DO
IF newtm.selections[selection].valid AND loc<=newtm.selections[selection].interval.base THEN newtm.selections[selection].interval.base _ newtm.selections[selection].interval.base + size;
ENDLOOP;
};

BasicDelete: PROC [oldtm: TextMutant, interval: PipalInt.Interval] RETURNS [changed: PipalInt.Interval, newtm: TextMutant] = {
oldSize: INT _ Rope.Size[oldtm.text.rope];
base: Location _ interval.base;
size: INT _ interval.size;
newtm _ NEW [TextMutantRec _ oldtm^];
newtm.text _ CreatePipalText[Rope.Cat[Rope.Substr[oldtm.text.rope, 0, base], Rope.Substr[oldtm.text.rope, base+size, oldSize-(base+size)]], oldtm.text.size];
changed _ [base, oldSize];
FOR sel: Selections IN Selections DO
IF oldtm.selections[sel].valid THEN { 
oldInterv: PipalInt.Interval _ oldtm.selections[sel].interval;
interv: PipalInt.Interval _ PipalInt.IntersectionIntervals[interval, oldInterv];
IF base<oldInterv.base THEN newtm.selections[sel].interval.base _ IF base+size<oldInterv.base THEN oldInterv.base - size ELSE base;
IF interv.size>0 THEN newtm.selections[sel].interval.size _ oldInterv.size - interv.size;
};
ENDLOOP;
};

SetSelection: PUBLIC PROC [tm: TextMutant, interval: PipalInt.Interval, selection: Selections _ primary, pendingDelete: BOOL _ FALSE, caretAfter: BOOL _ FALSE, granularity: SelectionGrain _ char] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
text: PipalText _ tm.text;
newtm _ NEW [TextMutantRec _ tm^];
changed _ IF newtm.selections[selection].valid 
THEN newtm.selections[selection].interval 
ELSE [0, 0];
newtm.selections[selection].valid _ TRUE;
newtm.selections[selection].interval _ interval;
newtm.selections[selection].pendingDelete _ pendingDelete;
newtm.selections[selection].caretAfter _ caretAfter;
newtm.selections[selection].granularity _ granularity;
IF (tm.selections[selection].interval.size#0 AND tm.selections[selection].granularity=point) OR (caretAfter AND interval.base>=Rope.Size[text.rope]) THEN ERROR;
changed _ PipalInt.UnionIntervals[changed, interval];
message _ "select";
};

CancelSelection: PUBLIC PROC [tm: TextMutant, selection: Selections _ primary] RETURNS [message: Pipal.ROPE, changed: PipalInt.Interval, newtm: TextMutant] = {
newtm _ NEW [TextMutantRec _ tm^];
newtm.selections[selection].valid _ FALSE;
changed _ newtm.selections[selection].interval;
message _ "cancel selection";
};

DecomposeIntervals: PROC [i1, i2: PipalInt.Interval] RETURNS [i3, i4: PipalInt.Interval, switched: BOOL _ FALSE] = {
IF i1.base>i2.base THEN {
t: PipalInt.Interval _ i1; i1 _ i2; i2 _ t;
switched _ TRUE;
};
i3.base _ i1.base;
i3.size _ MIN [i1.size, i2.base-i1.base];
i4.base _ MAX [i2.base, i1.base+i1.size];
i4.size _ MIN [i2.size, ABS [(i2.base+i2.size)-(i1.base+i1.size)]];
};

RectanglePointDistance: PROC [rectangle: PipalReal.Rectangle, position: PipalReal.Position] RETURNS [distance: REAL] = {
distance _ MIN[
PointDistance[position, rectangle.base],
PointDistance[position, [rectangle.base.x, rectangle.base.y+rectangle.size.y]],
PointDistance[position, [rectangle.base.x+rectangle.size.x, rectangle.base.y]],
PointDistance[position, [rectangle.base.x+rectangle.size.x, rectangle.base.y+rectangle.size.y]]];
};

PointDistance: PROC [p1, p2: PipalReal.Position] RETURNS [distance: REAL] = {
x1x2: REAL _ ABS[p1.x-p2.x];
y1y2: REAL _ ABS[p1.y-p2.y];
distance _ Real.SqRt[x1x2*x1x2+y1y2*y1y2];
};

Pipal.PutClassMethod[pipalTextClass, Pipal.describeMethod, NEW [Pipal.DescribeProc _ TextDescribe]];
Pipal.PutClassMethod[pipalTextClass, PipalReal.sizeMethod, NEW [PipalReal.SizeProc _ TextSize]];
Pipal.PutClassMethod[pipalTextClass, PipalPaint.paintMethod, NEW [PipalPaint.PaintProc _ TextPaint]];

Pipal.PutClassMethod[textMutantClass, Pipal.describeMethod, NEW [Pipal.DescribeProc _ TextMutantDescribe]];
Pipal.PutClassMethod[textMutantClass, PipalReal.sizeMethod, NEW [PipalReal.SizeProc _ TextMutantSize]];
Pipal.PutClassMethod[textMutantClass, PipalPaint.paintMethod, NEW [PipalPaint.PaintProc _ TextMutantPaint]];

Pipal.PutClassMethod[pipalTextClass, PipalMutate.mutationMethod, NEW [PipalMutate.MutationProc _ MutatePipalText]];


END.

<PipalTextMutantImpl.mesa
Copyright ำ 1988 by Xerox Corporation.  All rights reserved.
Barth, February 9, 1988 10:33:36 am PST
Bertrand Serlet May 20, 1988 1:52:09 pm PDT

Text Class
Text Mutant Class
Creation

Manipulation
SEEMS BUGGY (BS March 1, 1988 12:09:39 pm PST)
Selection
PipalInt
Orders i1 and i2 so that i3.base<i4.base and then computes intervals which cover the nonintersecting portions of i3 and i4.  If i1 and i2 are exchanged then switched is TRUE.
PipalReal
This is a hack, really should compute distance to edges, not corner points.
Initialization
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