DIRECTORY
Basics USING [BYTE],
IO USING [STREAM],
Rope USING [MaxLen, ROPE];

IPMaster: CEDAR DEFINITIONS
~ BEGIN

BYTE: TYPE ~ Basics.BYTE;
STREAM: TYPE ~ IO.STREAM;
ROPE: TYPE ~ Rope.ROPE;
MaxLen: INT ~ Rope.MaxLen;
MaxTextLen: NAT ~ NAT.LAST;
Version: TYPE ~ RECORD [major, minor: CARDINAL]; -- Interpress version number
currentVersion: Version ~ [3, 0]; -- latest version supported by this interface

Op: TYPE ~ {
nil, 
-- BASE primitives
get, makeveclu, makevec, shape, getprop, getp, mergeprop, fget, fset, 
makesimpleco, do, dosave, dosaveall, dosavesimplebody, findoperator, 
pop, copy, dup, roll, exch, mark, unmark, unmark0, count, nop, error, 
if, ifelse, ifcopy, eq, gt, ge, and, or, not, type, 
add, sub, neg, abs, floor, ceiling, trunc, round, mul, div, mod, rem, 
-- IMAGE primitives
iget, iset, maket, translate, rotate, scale, scale2, concat, 
concatt, move, trans, setxy, setxyrel, setxrel, setyrel, getcp, 
makepixelarray, extractpixelarray, finddecompressor, 
makegray, findcolor, findcoloroperator, findcolormodeloperator, 
makesampledcolor, makesampledblack, setgray, setsampledcolor, setsampledblack, 
moveto, lineto, linetox, linetoy, curveto, conicto, arcto, 
makeoutline, makeoutlineodd, maskfill, maskfillparity, maskrectangle, 
startunderline, maskunderline, masktrapezoidx, masktrapezoidy, 
maskstroke, maskstrokeclosed, maskvector, maskdashedstroke, maskpixel, 
clipoutline, cliprectangle, 
maskchar, makefont, findfont, modifyfont, setfont, 
show, showandxrel, showandfixedxrel, 
correctmask, correctspace, space, setcorrectmeasure, setcorrecttolerance, correct, 
-- Symbols
beginBody, endBody, beginBlock, endBlock, contentInstructions
};

ImagerVariable: TYPE ~ MACHINE DEPENDENT {
DCScpx(0), DCScpy(1), 
correctMX(2), correctMY(3), 
T(4), 
priorityImportant(5), 
mediumXSize(6), mediumYSize(7), 
fieldXMin(8), fieldYMin(9), 
fieldXMax(10), fieldYMax(11),
font(12), 
color(13), 
noImage(14), 
strokeWidth(15), 
strokeEnd(16), 
underlineStart(17), 
amplifySpace(18), 
correctPass(19), 
correctShrink(20), 
correctTX(21), correctTY(22),
strokeJoint(23), 
clipper(24)
};

StrokeEnd: TYPE ~ MACHINE DEPENDENT {square(0), butt(1), round(2)};

StrokeJoint: TYPE ~ MACHINE DEPENDENT {miter(0), bevel(1), round(2)};

shortNumberBias: INTEGER ~ 4000;

ShortNumber: TYPE ~ [0-shortNumberBias .. 77777B-shortNumberBias]; -- 15 bits

EncodingValue: TYPE ~ MACHINE DEPENDENT { -- 13 bits
nil(0),
nop(1),

setxy(10),
setxyrel(11),
setxrel(12),
setyrel(13),
linetox(14),
linetoy(15),
space(16),
get(17),
iget(18),
iset(19),
fget(20),
fset(21),
show(22),
lineto(23),
maskstroke(24),
moveto(25),

metricMaster(100), -- nonstandard
environmentMaster(101), -- nonstandard
beginBlock(102),
endBlock(103),

contentInstructions(105),
beginBody(106),
endBody(107),

correct(110),
disablecorrection(111), -- nonstandard

makesimpleco(114),
makeco(115), -- nonstandard
findoperator(116),

dosavesimplebody(120),
dobody(121), -- nonstandard
dosavebody(122), -- nonstandard
dosaveallbody(123), -- nonstandard

maskchar(140),

showandfixedxrel(145),
showandxrel(146),
findfont(147),
modifyfont(148),
finddecompressor(149),
makefont(150),
setfont(151),

setcorrectmeasure(154),
setcorrecttolerance(155),
correctmask(156),
correctspace(157),

getcp(159),
maket(160),
opent(161), -- nonstandard
translate(162),
rotate(163),
scale(164),
concat(165),
scale2(166),
invert(167), -- nonstandard
concatt(168),
move(169),
trans(170),

transform(174), -- nonstandard
transformvec(175), -- nonstandard
roundxy(176), -- nonstandard
roundxyvec(177), -- nonstandard

pop(180),
dup(181),

copy(183),
roll(184),
exch(185),
mark(186),
unmark(187),
count(188),

unmark0(192),

abs(200),
add(201),
and(202),
ceiling(203),
div(204),
eq(205),
floor(206),
ge(207),
gt(208),
mod(209),
mul(210),
neg(211),
not(212),
or(213),
sub(214),
trunc(215),
rem(216),
round(217),
eqname(218), -- nonstandard

type(220),
atan(221), -- nonstandard
cos(222), -- nonstandard
exp(223), -- nonstandard
log(224), -- nonstandard
sin(225), -- nonstandard
sqrt(226), -- nonstandard
max(227), -- nonstandard
min(228), -- nonstandard

do(231),
dosave(232),
dosaveall(233),

if(239),
ifcopy(240),
ifelse(241),
loop(242), -- nonstandard

frame(250), -- nonstandard

env(260), -- nonstandard

makeveclu(282),
makevec(283),
openvec(284), -- nonstandard
shape(285),
getp(286),
getprop(287),
mergeprop(288),

dround(300), -- nonstandard
getcprounded(301), -- nonstandard

curveto(402),
arcto(403),
conicto(404),

maskfillparity(408), -- nonstandard (for compatibility)
maskfill(409),
maskrectangle(410),
masktrapezoidx(411),
masktrapezoidy(412),
startunderline(413),
maskunderline(414),

makeoutlineodd(416),
makeoutline(417),
clipoutline(418),
cliprectangle(419),

findcoloroperator(421),
findcolormodeloperator(422),
findcolor(423),
setgray(424),
makegray(425),
makesampledblack(426),
makesampledcolor(427),
setsampledblack(428),
setsampledcolor(429),
excludeoutline(430), -- nonstandard
excluderectangle(431), -- nonstandard

maskstrokeclosed(440),
maskvector(441),
maskdashedstroke(442),

makepixelarray(450),
extractpixelarray(451),
maskpixel(452),
joinpixelarrays(453), -- nonstandard

error(600),

(17777B)
};

ShortEncodingValue: TYPE ~ EncodingValue[VAL[0]..VAL[37B]]; -- 5 bits

SequenceType: TYPE ~ MACHINE DEPENDENT { -- 5 bits
nil(0),
sequenceString(1),
sequenceInteger(2),
sequenceInsertMaster(3),
sequenceRational(4),
sequenceIdentifier(5),
sequenceComment(6),
sequenceContinued(7),
sequenceLargeVector(8),
sequencePackedPixelVector(9),
sequenceCompressedPixelVector(10),
sequenceInsertFile(11),
sequenceAdaptivePixelVector(12),
sequenceCCITT4PixelVector(13),

(37B)
};

ShortSequenceLength: TYPE ~ INT[0..377B]; -- 8 bits

LongSequenceLength: TYPE ~ INT--[0..77777777B]--; -- 24 bits

ErrorDesc: TYPE ~ RECORD[code: ATOM, explanation: ROPE, index: INT _ 0];
Error: ERROR[error: ErrorDesc];


EncodingValueFromOp: PROC [Op] RETURNS [EncodingValue];
OpFromEncodingValue: PROC [EncodingValue] RETURNS [Op];
OpFromRope: PROC [ROPE] RETURNS [Op];
RopeFromOp: PROC [Op] RETURNS [ROPE];
RopeFromImagerVariable: PROC [ImagerVariable] RETURNS [ROPE];


PartActionType: TYPE ~ PROC [base: ROPE, start, len: INT] RETURNS [quit: BOOL _ FALSE];

MapParts: PROC [base: ROPE, start: INT _ 0, len: INT _ MaxLen, 
delimiter: CHAR, action: PartActionType] RETURNS [BOOL];

ValidateIdentifier: PROC [rope: ROPE, start: INT _ 0, len: INT _ MaxLen];
ValidateName: PROC [rope: ROPE, start: INT _ 0, len: INT _ MaxLen];

ValidateString: PROC [rope: ROPE, start: INT _ 0, len: INT _ MaxLen];

ValidateVersion: PROC [rope: ROPE, start: INT _ 0, len: INT _ MaxLen];
VersionFromRope: PROC [rope: ROPE, start: INT _ 0, len: INT _ MaxLen] 
RETURNS [Version];

PutShortNumber: PROC [stream: STREAM, n: ShortNumber];

PutShortOp: PROC [stream: STREAM, ev: ShortEncodingValue];

PutLongOp: PROC [stream: STREAM, ev: EncodingValue];

PutShortSequence: PROC [stream: STREAM, seq: SequenceType, len: ShortSequenceLength];
PutLongSequence: PROC [stream: STREAM, seq: SequenceType, len: LongSequenceLength];
ByteCount: TYPE ~ NAT[0..4];

BytesInInt: PROC [val: INT] RETURNS [ByteCount];

PutIntBytes: PROC [stream: STREAM, val: INT, len: ByteCount];
PutByte: PROC [stream: STREAM, byte: BYTE];

PutOp: PROC [stream: STREAM, op: Op];
PutInt: PROC [stream: STREAM, n: INT];
PutRational: PROC [stream: STREAM, n, d: INT];

PutReal: PROC [stream: STREAM, val: REAL];

PutIdentifier: PROC [stream: STREAM, rope: ROPE, start: INT _ 0, len: INT _ MaxLen];

PutString: PROC [stream: STREAM, rope: ROPE, start: INT _ 0, len: INT _ MaxLen];

PutName: PROC [stream: STREAM, rope: ROPE, start: INT _ 0, len: INT _ MaxLen];

PutSequence: PROC [stream: STREAM, seq: SequenceType, len: INT];
PutSequenceRope: PROC [stream: STREAM, seq: SequenceType, 
rope: ROPE, start: INT _ 0, len: INT _ MaxLen];
PutSequenceText: PROC [stream: STREAM, seq: SequenceType, 
text: REF READONLY TEXT, start: NAT _ 0, len: NAT _ MaxTextLen];
TokenType: TYPE ~ {nil, op, num, seq};
TokenFormat: TYPE ~ {nil, shortOp, longOp, shortNumber, shortSequence, longSequence};
Token: TYPE ~ RECORD[
index: INT _ 0, -- stream index of token's first byte
type: TokenType _ nil, -- token type
format: TokenFormat _ nil, -- token format
op: Op _ nil, -- op value, if type=op (guaranteed nil if type#op)
ev: EncodingValue _ nil, -- encoding value, if type=op
num: ShortNumber _ ShortNumber.FIRST, -- number value, if type=num
seq: SequenceType _ nil, -- sequence type, if type=seq
len: INT _ 0 -- sequence data length, if type=seq (guaranteed 0 if type#seq)
];

Body: TYPE ~ REF BodyRep;
BodyRep: TYPE ~ RECORD[index, length: INT];

Node: TYPE ~ REF NodeRep;
NodeRep: TYPE ~ RECORD[
index, length: INT,
contentInstructions: Body, -- may be NIL
content: SELECT tag: * FROM
body => [body: Body],
block => [block: Block],
ENDCASE
];

Block: TYPE ~ REF BlockRep;
BlockRep: TYPE ~ RECORD[
index, length: INT,
noPages: BOOL,
preamble: Node,
nodes: SEQUENCE size: NAT OF Node
];

Skeleton: TYPE ~ REF SkeletonRep;
SkeletonRep: TYPE ~ RECORD[
instructions: Body, -- may be NIL
topBlock: Block
];


GetHeader: PROC [stream: STREAM, prefix: ROPE] RETURNS [ROPE];
GetSkeleton: PROC [stream: STREAM] RETURNS [Skeleton];
GetToken: PROC [stream: STREAM, flushComments: BOOL _ TRUE] RETURNS [Token];
SkipBytes: PROC [stream: STREAM, len: INT];
SetIndex: PROC [stream: STREAM, index: INT];
SkipToEndOfBody: PROC [stream: STREAM];
CopyBytes: PROC [to: STREAM, from: STREAM, count: INT] RETURNS [copied: INT];
CopySegment: PROC [to: STREAM, from: STREAM, start, length: INT];

IntFromSequenceData: PROC [text: REF READONLY TEXT, 
start: NAT _ 0, len: NAT _ MaxTextLen] RETURNS [INT];
RealFromSequenceData: PROC [text: REF READONLY TEXT, 
start: NAT _ 0, len: NAT _ MaxTextLen] RETURNS [REAL];


END.
fIPMaster.mesa
Copyright c 1984, 1985, 1986 by Xerox Corporation.  All rights reserved.
Doug Wyatt, May 30, 1986 2:44:21 pm PDT

Operations for reading and writing Interpress masters at the token level.

Basic types
Xerox Encoding
Errors, Utilities
Converts an Op to a Xerox encoding value.

Converts a Xerox encoding value to an Op. Returns nil if undefined.

Converts a ROPE to an Op. Ignores case. Returns nil if undefined.

Converts an Op to a ROPE. Returns NIL if given nil.

Converts an ImagerVariable to a ROPE.
Applies action to each part of a subrope; delimiter separates parts.
Returns TRUE when some action returns TRUE.
For example, delimiter='/ parses a structured name, delimiter='. parses a version number.
Verifies that the specified subrope is a valid Identifier.
See the Interpress Standard, section 2.2.2.
! $invalidIdentifier if the identifier is empty or contains an illegal character.

Verifies that the specified subrope is a valid structured name.
See the Interpress Standard, section 3.2.1.
! $invalidIdentifier if the name contains an invalid identifier.
! $invalidName if the name is empty.
Verifies that the specified subrope is a valid Xerox string.
See the Character Code Standard, chapter 6, and the Interpress Standard, section 2.5.3.
! $invalidString if the string contains an invalid code or ends within an escape sequence.
Verifies that the specified subrope is a valid Interpress version number.
! $invalidVersion if the version number is malformed.

Parses a Version number of the form "m.n".
Writing a master
Appends a ShortNumber token (2 bytes).
Appends a ShortOp token (1 byte).
Appends a LongOp token (2 bytes).
Appends a ShortSequence token (2 bytes).

Appends a LongSequence token (4 bytes).

Returns the minimum number of bytes needed to represent val in two's complement.
Appends the low order len bytes of val.

Appends a single byte.

Appends a primitive operator or symbol literal; chooses the shortest encoding.

Appends an integer Number literal; chooses the shortest encoding.

Appends a rational Number literal, n/d.
! $invalidRational if d is zero.
Appends a Number literal. Chooses a rational approximation if necessary.
Appends an Identifier literal.  See the Interpress Standard, section 2.2.2.
! $invalidIdentifier if the identifier is malformed.
Appends the encoding notation for a string. Treats '\377 as an escape code.
! $invalidString if the string is malformed.
Parses a structured name and appends tokens to build a Vector of Identifiers.
For example, "a/b/c" produces < a b c 3 MAKEVEC >; "id" produces < id 1 MAKEVEC >.
See the Interpress Standard, section 3.2.1.
! $invalidName or $invalidIdentifier if the name is malformed.
Appends a sequence descriptor; chooses the shortest encoding.
Must be followed immediately by len data bytes.

Appends a sequence with data obtained from Rope.Map[rope, start, len].

Appends a sequence with data obtained from RefText.Map[text, start, len].

Reading a master
First reads prefix.Length[] chars, which must match prefix (typically "Interpress/").
Then reads up to the first space; leaves the stream positioned after the space.
Returns the characters between the prefix and the space (for example, "Xerox/2.1").
! $invalidHeader if the prefix doesn't match.

Parses the skeleton structure of the master, starting at the current stream index.
! $invalidSkeleton if the skeleton is malformed.

Reads from the stream a token in the Xerox encoding. See Interpress, section 2.5.1.
If token.type=seq, caller must read token.len data bytes from stream to reach next token.
If flushComments, skips over comments (sequenceComment and any continuations).

Skips len bytes in the stream; equivalent to IO.SetIndex[stream, IO.GetIndex[stream]+len].

Same as IO.SetIndex[stream, index]. Here for convenience.

Skips to the end of the enclosing body.
Leaves the stream positioned at the token following the body.

Copies bytes to an output stream from an input stream.
Returns the actual number of bytes copied.

Does SetIndex[from, start], then copies length bytes.
! IO.EndOfStream[from] if too few bytes were copied.

These interpret text[start..start+len) as a two's complement binary integer.

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