GGFontImpl.mesa
Copyright (C) 1987 by Xerox Corporation. All rights reserved.
Created by: Ken Pier, February 10, 1987 11:23:45 am PST
Last Edited by: Ken Pier, February 17, 1987 12:46:30 pm PST
DIRECTORY
Convert, FileNames, GGFont, GGParseIn, Imager, ImagerFont, ImagerTransformation, IO, Real, Rope;
GGFontImpl: CEDAR PROGRAM IMPORTS Convert, FileNames, GGParseIn, Imager, ImagerFont, ImagerTransformation, IO, Real, Rope
EXPORTS GGFont = BEGIN
ROPE: TYPE = Rope.ROPE;
FontData: TYPE = GGFont.FontData;
FontDataRec: TYPE = GGFont.FontDataRec;
ParseError: PUBLIC SIGNAL[explanation: ROPE] = CODE;
boldList: LIST OF ROPELIST["-B", "-BI"];
italicList: LIST OF ROPELIST["-I", "-BI"];
endList: LIST OF ROPELIST["mrr", "mir", "brr", "bir", "bold", "italic"];
DigitProc: IO.BreakProc = {
SELECT char FROM
IO.TAB, IO.CR, IO.SP => RETURN [break];
'0, '1, '2, '3, '4, '5, '6, '7, '8, '9 => RETURN [break];
ENDCASE => RETURN [other];
};
NonDigitProc: IO.BreakProc = {
SELECT char FROM
'0, '1, '2, '3, '4, '5, '6, '7, '8, '9 => RETURN [other];
ENDCASE => RETURN [break];
};
CreateFontData: PUBLIC PROC RETURNS [data: FontData] ={
data ← NEW[FontDataRec ← []];
};
InitFontData: PUBLIC PROC [data: FontData] RETURNS [newData: FontData] ={
newData ← data;
IF newData#NIL THEN newData^ ← []; -- fill in from definition defaults
};
CopyFontData: PUBLIC PROC [data: FontData, oldCopy: FontData ← NIL] RETURNS [newCopy: FontData] ={
newCopy ← IF oldCopy#NIL THEN oldCopy ELSE CreateFontData[];
IF data#NIL THEN newCopy^ ← data^;
IF newCopy.transform#NIL THEN newCopy.transform ← ImagerTransformation.Copy[newCopy.transform];
};
ParseFontData: PUBLIC PROC [data: FontData ← NIL, inStream: IO.STREAM, literalP, prefixP, familyP, faceP, transformP, scaleP, storedSizeP, designSizeP: BOOLFALSE] RETURNS [newData: FontData] ={
! ParseError[explanation] if something goes wrong.
Takes a FontData (if NIL, will create a new one), a stream, and BOOLEANS which denote what tokens to parse out of the stream and put in the newData. If literalP is TRUE, then prefixP, familyP, faceP are ignored and the parser only attempts to find a literal string and parses it no further. IF it is not literal, then if familyP then a userFSF string is parsed, and if faceP then the parser tries to extract face information from the userFSF. Fills in as many of the newData fields as possible.
ENABLE IO.Error, IO.EndOfStream, Convert.Error, GGParseIn.SyntaxError => {
ParseError["Font Parse Error"]; -- for now
CONTINUE;
};
DisallowedEnding: PROC [s: Rope.ROPE] RETURNS [BOOL] = {
tail: Rope.ROPE ← FileNames.Tail[s, '-];
FOR endRope: LIST OF ROPE ← endList, endRope.rest UNTIL endRope=NIL DO
IF Rope.Find[s, endRope.first, 0, FALSE]#-1 THEN RETURN[TRUE];
ENDLOOP;
RETURN[FALSE];
};
newData ← IF data=NIL THEN CreateFontData[] ELSE data;
IF literalP THEN {
newData.literal ← IO.GetTokenRope[inStream, IO.IDProc].token; -- "xerox/myFonts/FooBarFont"
newData.prefix ← FileNames.Directory[newData.literal]; -- "xerox/myFonts/"
newData.literalFSF ← FileNames.Tail[newData.literal, '/]; -- "FooBarFont"
}
ELSE {
lit: ROPEIO.GetTokenRope[inStream, IO.IDProc].token; -- "xerox/xc1-2-2/Modern-BI"
IF prefixP THEN {
newData.prefix ← FileNames.Directory[lit]; -- "xerox/xc1-2-2/"
lit ← FileNames.Tail[lit, '/]; -- "Modern-BI"
};
IF familyP THEN {
IF DisallowedEnding[lit] THEN ParseError["Literal name not allowed"];
newData.userFSF ← lit; -- "Modern-BI"
newData.family ← Before[lit, '-]; -- "Modern
};
IF faceP THEN { -- means figure out the faces from the userFSF
faceRope: ROPE;
faceS: IO.STREAMIO.RIS[newData.userFSF]; -- "Modern-BI"
[] ← IO.GetTokenRope[faceS, IO.TokenProc]; -- read and discard family name "Modern"
faceRope ← IO.GetTokenRope[faceS, IO.IDProc ! IO.EndOfStream => CONTINUE;].token; -- "-BI or SP in other cases
FOR boldRope: LIST OF ROPE ← boldList, boldRope.rest UNTIL boldRope=NIL DO
IF newData.bold THEN EXIT;
newData.bold ← Rope.Find[faceRope, boldRope.first, 0, FALSE]#-1;
ENDLOOP;
FOR italicRope: LIST OF ROPE ← italicList, italicRope.rest UNTIL italicRope=NIL DO
IF newData.italic THEN EXIT;
newData.italic ← Rope.Find[faceRope, italicRope.first, 0, FALSE]#-1;
ENDLOOP;
newData.faceKnown ← TRUE;
};
newData.comfortable ← TRUE;
};
IF transformP THEN newData.transform ← GGParseIn.ReadFactoredTransformation[inStream];
IF transformP THEN newData.transform ← GGParseIn.ReadFactoredTransformationVEC[inStream];
IF scaleP THEN newData.scale ← Convert.RealFromRope[IO.GetTokenRope[inStream, IO.IDProc].token]; -- "12 or 20.123 or ..."
IF storedSizeP THEN newData.storedSize ← Convert.RealFromRope[IO.GetTokenRope[inStream, IO.IDProc].token]; -- "12 or 20.123 or ..."
IF designSizeP THEN newData.designSize ← Convert.RealFromRope[IO.GetTokenRope[inStream, IO.IDProc].token]; -- "12 or 20.123 or ..."
IF literalP THEN UserDataFromFontData[newData] ELSE LiteralDataFromFontData[newData];
};
LiteralDataFromFontData: PUBLIC PROC [data: FontData] ={
! ParseError[explanation] if something goes wrong.
Constructs a literal font name from the (non NIL) values in the FontData and fills in the literal field in FontData.
This routine has the hairy specific knowledge of the formats of font names.
So far: prefix  face  fontName suffix
 xerox/xc1-2-2/ -B -bold
 xerox/xc1-2-2/ -I -italic
 xerox/xc1-2-2/ -BI -bold-italic
 xerox/xc1-2-2/ -IB -bold-italic
 xerox/xc1-2-2/ none none
 xerox/pressfonts/ -B -brr
 xerox/pressfonts/ -I -mir
 xerox/pressfonts/ -BI -bir
 xerox/pressfonts/ -IB -bir
 xerox/pressfonts/ none -mrr (unless CMR font)
 xerox/tiogafonts/ -B Fix[size]B
 xerox/tiogafonts/ -I Fix[size]I
 xerox/tiogafonts/ -BI Fix[size]BI
 xerox/tiogafonts/ -IB Fix[size]BI
 xerox/tiogafonts/ none Fix[size]
ENABLE IO.Error, IO.EndOfStream, Convert.Error, GGParseIn.SyntaxError => {
ParseError["Font Parse Error"]; -- for now
CONTINUE;
};
HasEndDigits: PROC RETURNS [yep: BOOL ← FALSE] = {
For PressFonts Only; digits on the end indicate a "stored size" but ImagerFont produces a unit font with no face characters like -mrr; e.g. cmr60, cmbbi66, ...
ENABLE IO.Error, IO.EndOfStream, Convert.Error => {
yep ← FALSE;
CONTINUE;
};
nameStream: IO.STREAMIO.RIS[data.family]; -- Helvetica or cmbbi66
[] ← IO.GetTokenRope[nameStream, DigitProc]; -- toss the leading alpha characters
yep ← Convert.IntFromRope[IO.GetTokenRope[nameStream, NonDigitProc].token]>0; -- get any digit characters. Assume font names indicate positive values.
};
pressPrefix: Rope.ROPE ← "xerox/pressfonts/";
printPrefix: Rope.ROPE ← "xerox/xc1-2-2/";
screenPrefix: Rope.ROPE ← "xerox/tiogafonts/";
faceRope: Rope.ROPE;
SELECT TRUE FROM
Rope.Equal[data.prefix, pressPrefix, FALSE] AND data.faceKnown => {
faceRope ← SELECT TRUE FROM
data.bold AND data.italic => "-bir",
data.bold => "-brr",
data.italic => "-mir",
ENDCASE => IF HasEndDigits[] THEN "" ELSE "-mrr";
};
Rope.Equal[data.prefix, printPrefix, FALSE] AND data.faceKnown => {
faceRope ← SELECT TRUE FROM
data.bold AND data.italic => "-bold-italic",
data.bold => "-bold",
data.italic => "-italic",
ENDCASE => "";
};
Rope.Equal[data.prefix, screenPrefix, FALSE] => { -- derive storedSize from the font name
For TiogaFonts, data.family includes storedSize, like Tioga10
storedSize: REAL ← 1.5;
nameStream: IO.STREAMIO.RIS[data.userFSF]; -- Tioga10-BI or TERMINAL
[] ← IO.GetTokenRope[nameStream, DigitProc]; -- get the leading alpha characters
storedSize ← Convert.RealFromRope[IO.GetTokenRope[nameStream, NonDigitProc].token]; -- get any digit characters
IF Real.Float[Real.Fix[storedSize]] # storedSize THEN ParseError["StoredSize must be an integer for screen fonts"];
data.storedSize ← storedSize; -- so things come out the right size
faceRope ← SELECT TRUE FROM
data.bold AND data.italic => "BI",
data.bold => "B",
data.italic => "I",
ENDCASE => "";
};
ENDCASE => NULL;
data.literalFSF ← Rope.Concat[data.family, faceRope];
data.literal ← Rope.Concat[data.prefix, data.literalFSF];
};
UserDataFromFontData: PUBLIC PROC [data: FontData] ={
! ParseError[explanation] if something goes wrong.
Parses the literal font string in FontData, filling in the other values in FontData as possible.
ENABLE IO.Error, IO.EndOfStream, Convert.Error, GGParseIn.SyntaxError => {
ParseError["Font Parse Error"]; -- for now
CONTINUE;
};
isBold, isItalic: BOOLFALSE;
userFace, literalFace: Rope.ROPE;
pressPrefix: Rope.ROPE ← "xerox/pressfonts/";
printPrefix: Rope.ROPE ← "xerox/xc1-2-2/";
screenPrefix: Rope.ROPE ← "xerox/tiogafonts/";
cmrFamily: Rope.ROPE ← "CMR";
dashBold: Rope.ROPE ← "-bold";
dashItalic: Rope.ROPE ← "-italic";
IF data.literal=NIL OR data.literalFSF=NIL THEN ERROR;
data.prefix ← FileNames.Directory[data.literal]; -- xerox/...
SELECT TRUE FROM
Rope.Equal[data.prefix, pressPrefix, FALSE] => {
xerox/pressfonts/Helvetica-bir or xerox/pressfonts/CMR63
data.family ← Before[data.literalFSF, '-]; -- Helvetica or CMR
literalFace ← FileNames.Tail[data.literalFSF, '-]; -- bir or NIL
data.bold ← Rope.Equal[literalFace, "bir", FALSE] OR Rope.Equal[literalFace, "brr", FALSE];
data.italic ← Rope.Equal[literalFace, "bir", FALSE] OR Rope.Equal[literalFace, "mir", FALSE];
data.faceKnown ← TRUE;
data.comfortable ← TRUE;
userFace ← SELECT TRUE FROM
Rope.Equal[literalFace, "bir", FALSE] => "-BI",
Rope.Equal[literalFace, "brr", FALSE] => "-B",
Rope.Equal[literalFace, "mir", FALSE] => "-I",
Rope.Equal[literalFace, "mrr", FALSE] => "",
ENDCASE => "";
data.userFSF ← Rope.Concat[data.family, userFace];
};
Rope.Equal[data.prefix, printPrefix, FALSE] => {
xerox/xc1-2-2/Modern-bold-italic
data.family ← Before[data.literalFSF, '-]; -- Modern
data.bold ← Rope.Find[data.literalFSF, dashBold, 0, FALSE]#-1; -- has -bold
data.italic ← Rope.Find[data.literalFSF, dashItalic, 0, FALSE]#-1; -- has -italic
data.faceKnown ← TRUE;
data.comfortable ← TRUE;
userFace ← SELECT TRUE FROM
isBold AND isItalic => "-BI",
isBold => "-B",
isItalic => "-I",
ENDCASE => "";
data.userFSF ← Rope.Concat[data.family, userFace];
};
Rope.Equal[data.prefix, screenPrefix, FALSE] => { --Tioga10BI or TERMINAL
alphaRope, faceRope, storedSizeRope: Rope.ROPE;
storedSize: REAL ← 1.5; --, non integer default used below
nameStream: IO.STREAMIO.RIS[data.literalFSF]; -- Tioga10BI or TERMINAL
alphaRope ← IO.GetTokenRope[nameStream, DigitProc].token; -- get the leading alpha characters
storedSizeRope ← IO.GetTokenRope[nameStream, NonDigitProc ! IO.EndOfStream, IO.Error => CONTINUE;].token; -- get any digit characters
faceRope ← GGParseIn.ReadBlankAndWord[nameStream]; -- like BI or NIL
storedSize ← Convert.RealFromRope[storedSizeRope ! Convert.Error => CONTINUE;]; -- get any digit characters
IF Real.Float[Real.Fix[storedSize]] # storedSize THEN ParseError["StoredSize must be an integer for screen fonts"];
data.family ← Rope.Concat[alphaRope, storedSizeRope]; -- concat alpha and numeric parts
data.scale ← data.storedSize ← storedSize; -- so things come out the right size. Note that this overides the user input during SetFontLiteral. The rule we use is that if you use a TiogaFont with a size in the name, like Tioga10, we derive the storedSize and scale from the name.
IF faceRope#NIL THEN faceRope ← Rope.Concat["-", faceRope];
data.userFSF ← Rope.Concat[data.family, faceRope];
data.faceKnown ← TRUE;
data.comfortable ← TRUE;
FOR boldRope: LIST OF ROPE ← boldList, boldRope.rest UNTIL boldRope=NIL DO
IF data.bold THEN EXIT;
data.bold ← Rope.Find[faceRope, boldRope.first, 0, FALSE]#-1;
ENDLOOP;
FOR italicRope: LIST OF ROPE ← italicList, italicRope.rest UNTIL italicRope=NIL DO
IF data.italic THEN EXIT;
data.italic ← Rope.Find[faceRope, italicRope.first, 0, FALSE]#-1;
ENDLOOP;
};
ENDCASE => NULL;
};
AlternateFont: PUBLIC PROC [data: FontData, font: ImagerFont.Font, op: ATOM] RETURNS [alternate: ImagerFont.Font] = {
Takes an existing font and fontData and returns an alternate. Only implemented op is $visible.
Returns font if no alternate is possible. Remember that the alternate font has to work with the transformation in data.transform.
IF font=NIL THEN RETURN[NIL];
IF op#$visible THEN RETURN[font];
So, what do we do here, Bunkie?? Well, if we have a PressFont or an XC (Print) font, with a suitable data.userFSF, we concoct a TiogaFont name and see if we can Find it. Otherwise, we punt.
IF Rope.Find[data.prefix, "pressfont", 0, FALSE]#-1 OR Rope.Find[data.prefix, "xc1", 0, FALSE]#-1 THEN {
dashIndex: INT ← Rope.Index[data.userFSF, 0, "-"]; -- is there a dash in the userFSF ??
altName: Rope.ROPEIF dashIndex=-1 THEN Rope.Cat["xerox/tiogafonts/", data.userFSF, "10"] ELSE Rope.Cat["xerox/tiogafonts/", Rope.Replace[data.userFSF, dashIndex, 1, "10"] ];
alternate ← ImagerFont.Scale[ImagerFont.Find[altName ! Imager.Error => {alternate ← font; CONTINUE;}; ], 0.10];
}
ELSE alternate ← font;
};
Head: PROC [s: Rope.ROPE, char: CHAR] RETURNS [Rope.ROPE] = {
Head returns the part of a rope before the last instance of char.
Head returns the entire rope if char is not found
pos: INT ← s.Length[] - 1;
IF pos < 0 THEN RETURN[NIL];
DO
IF s.Fetch[pos] = char THEN RETURN[s.Substr[0, pos]];
pos ← pos - 1;
IF pos < 0 THEN RETURN[s];
ENDLOOP;
};
Before: PROC [s: Rope.ROPE, char: CHAR] RETURNS [Rope.ROPE] = {
Before returns the part of a rope before the first instance of char.
Before returns the entire rope if char is not found
pos: INT ← 0;
len: INT ← s.Length[];
IF s=NIL THEN RETURN[NIL];
DO
IF s.Fetch[pos] = char THEN RETURN[s.Substr[0, pos]];
pos ← pos + 1;
IF pos = len THEN RETURN[s];
ENDLOOP;
};
OldParseFontData: PUBLIC PROC [inStream: IO.STREAM, prefixP, familyP, faceP, transformP, sizeP: BOOLFALSE] RETURNS [fail: BOOL, prefix, family, face: Rope.ROPE, transform: ImagerTransformation.Transformation, size: REAL ← 0.0] = {
ENABLE IO.Error, IO.EndOfStream, Convert.Error, GGParseIn.SyntaxError => {
fail ← TRUE;
CONTINUE;
};
ReadWord: PROC [f: IO.STREAM] RETURNS [word: Rope.ROPE] = {
Used to read in a rope which is data.
WordBreakProc: SAFE PROC [char: CHAR] RETURNS [IO.CharClass] = CHECKED {
SELECT char FROM
IO.TAB => RETURN [break];
IO.CR =>RETURN [break];
IO.SP => RETURN [break];
', => RETURN [break];
'] => RETURN [break];
') => RETURN [break];
ENDCASE => RETURN [other];
};
[word, ----] ← IO.GetTokenRope[f, WordBreakProc
!IO.EndOfStream => {word ← NIL; CONTINUE}];
};
nameStream: IO.STREAM;
fail ← FALSE;
IF prefixP THEN prefix ← IO.GetTokenRope[inStream, IO.IDProc].token; -- "xerox/myfonts/"
nameStream ← IO.RIS[IO.GetTokenRope[inStream, IO.IDProc].token]; -- "fontOne-BI"
IF familyP THEN family ← IO.GetTokenRope[nameStream, IO.TokenProc].token; -- "fontOne"
IF faceP THEN face ← ReadWord[nameStream]; -- "-BI" (or SP)
IF transformP THEN transform ← GGParseIn.ReadFactoredTransformation[inStream];
IF sizeP THEN size ← Convert.RealFromRope[IO.GetTokenRope[inStream, IO.IDProc].token]; -- "12"
};
END.