ref: a411870ee4640241e3c494367d922847da84f972
dir: purgatorio/appl/charon/build.m
Build: module
{
PATH: con "/dis/charon/build.dis";
# Item layout is dictated by desire to have all but formfield and table
# items allocated in one piece.
# Also aiming for the 128-byte allocation quantum, which means
# keeping the total size at 17 32-bit words, including pick tag.
Item: adt
{
next: cyclic ref Item; # successor in list of items
width: int; # width in pixels (0 for floating items)
height: int; # height in pixels
ascent: int; # ascent (from top to baseline) in pixels
anchorid: int; # if nonzero, which anchor we're in
state: int; # flags and values (see below)
genattr: ref Genattr; # generic attributes and events
pick {
Itext =>
s: string; # the characters
fnt: int; # style*NumSize+size (see font stuff, below)
fg: int; # Pixel (color) for text
voff: byte; # Voffbias+vertical offset from baseline, in pixels (+ve == down)
ul: byte; # ULnone, ULunder, or ULmid
Irule =>
align: byte; # alignment spec
noshade: byte; # if true, don't shade
size: int; # size attr (rule height)
wspec: Dimen; # width spec
Iimage =>
imageid: int; # serial no. of image within its doc
ci: ref CharonUtils->CImage; # charon image (has src, actual width, height)
imwidth: int; # spec width (actual, if no spec)
imheight: int; # spec height (actual, if no spec)
altrep: string; # alternate representation, in absence of image
map: ref Map; # if non-nil, client side map
name: string; # name attribute
ctlid: int; # if animated
align: byte; # vertical alignment
hspace: byte; # in pixels; buffer space on each side
vspace: byte; # in pixels; buffer space on top and bottom
border: byte; # in pixels: border width to draw around image
Iformfield =>
formfield: ref Formfield;
Itable =>
table: ref Table;
Ifloat =>
item: ref Item; # content of float
x: int; # x coord of top (from right, if Aright)
y: int; # y coord of top
side: byte; # margin it floats to: Aleft or Aright
infloats: byte; # true if this has been added to a lay.floats
Ispacer =>
spkind: int; # ISPnone, etc.
fnt: int; # font number
}
newtext: fn(s: string, fnt, fg, voff: int, ul: byte) : ref Item;
newrule: fn(align: byte, size, noshade: int, wspec: Dimen) : ref Item;
newimage: fn(di: ref Docinfo, src: ref Url->Parsedurl, lowsrc: ref Url->Parsedurl, altrep: string,
align: byte, width, height, hspace, vspace, border, ismap, isbkg: int,
map: ref Map, name: string, genattr: ref Genattr) : ref Item;
newformfield: fn(ff: ref Formfield) : ref Item;
newtable: fn(t: ref Table) : ref Item;
newfloat: fn(i: ref Item, side: byte) : ref Item;
newspacer: fn(spkind, font: int) : ref Item;
revlist: fn(itl: list of ref Item) : list of ref Item;
print: fn(it: self ref Item);
printlist: fn(items: self ref Item, msg: string);
};
# Item state flags and value fields
IFbrk: con (1<<31); # forced break before this item
IFbrksp: con (1<<30); # add 1 line space to break (IFbrk set too)
IFnobrk: con (1<<29); # break not allowed before this item
IFcleft: con (1<<28); # clear left floats (IFbrk set too)
IFcright: con (1<<27); # clear right floats (IFbrk set too)
IFwrap: con (1<<26); # in a wrapping (non-pre) line
IFhang: con (1<<25); # in a hanging (into left indent) item
IFrjust: con (1<<24); # right justify current line
IFcjust: con (1<<23); # center justify current line
IFsmap: con (1<<22); # image is server-side map
IFbkg: con (1<<21); # Item.image is a background image
IFindentshift: con 8;
IFindentmask: con (255<<IFindentshift); # current indent, in tab stops
IFhangmask: con 255; # current hang into left indent, in 1/10th tabstops
Voffbias: con 128;
# Spacer kinds. ISPnull has 0 height and width,
# ISPvline has height/ascent of current font
# ISPhspace has width of space in current font
# ISPgeneral used for other purposes (e.g. between list markers and list).
ISPnull, ISPvline, ISPhspace, ISPgeneral: con iota;
# Generic attributes and events (not many elements will have any of these set)
Genattr: adt
{
id: string; # document-wide unique id
class: string; # space-separated list of classes
style: string; # associated style info
title: string; # advisory title
events: list of Lex->Attr; # attid will be Aonblur, etc., value is script
evmask: int; # Aonblur|Aonfocus, etc. when present
};
# Formfield Item: a field from a form
# form field types (ints because often case on them)
Ftext, Fpassword, Fcheckbox, Fradio, Fsubmit, Fhidden, Fimage,
Freset, Ffile, Fbutton, Fselect, Ftextarea: con iota;
Formfield: adt
{
ftype: int; # Ftext, Fpassword, etc.
fieldid: int; # serial no. of field within its form
form: cyclic ref Form; # containing form
name: string; # name attr
value: string; # value attr
size: int; # size attr
maxlength: int; # maxlength attr
rows: int; # rows attr
cols: int; # cols attr
flags: byte; # FFchecked, etc.
options: list of ref Option; # for Fselect fields
image: cyclic ref Item; # image item, for Fimage fields
ctlid: int; # identifies control for this field in layout
events: list of Lex->Attr; # same as genattr.events of containing item
evmask: int;
new: fn(ftype, fieldid: int, form: ref Form, name, value: string, size, maxlength: int) : ref Formfield;
};
# Form flags
FFchecked: con byte (1<<7);
FFmultiple: con byte (1<<6);
# Option holds info about an option in a "select" form field
Option: adt {
selected: int; # true if selected initially
value: string; # value attr
display: string; # display string
};
# Form holds info about a form
Form: adt
{
formid: int; # serial no. of form within its doc
name: string; # name or id attr (netscape uses name, HTML 4.0 uses id)
action: ref Url->Parsedurl; # action attr
target: string; # target attribute
method: int; # HGet or HPost
events: list of Lex->Attr; # attid will be Aonreset or Aonsubmit
evmask: int;
nfields: int; # number of fields
fields: cyclic list of ref Formfield; # field's forms, in input order
state: int; # see Form states enum
new: fn(formid: int, name: string, action: ref Url->Parsedurl, target: string, method: int, events: list of Lex->Attr) : ref Form;
};
# Form states
FormBuild, # seen <FORM>
FormDone, # seen </FORM>
FormTransferred : con iota; # tx'd to javascript
# Flags used in various table structures
TFparsing: con byte (1<<7);
TFnowrap: con byte (1<<6);
TFisth: con byte (1<<5);
# A Table Item is for a table.
Table: adt
{
tableid: int; # serial no. of table within its doc
nrow: int; # total number of rows
ncol: int; # total number of columns
ncell: int; # total number of cells
align: Align; # alignment spec for whole table
width: Dimen; # width spec for whole table
border: int; # border attr
cellspacing: int; # cellspacing attr
cellpadding: int; # cellpadding attr
background: Background; # table background
caption: cyclic ref Item; # linked list of Items, giving caption
caption_place: byte; # Atop or Abottom
caption_lay: int; # identifies layout of caption
currows: cyclic list of ref Tablerow; # during parsing
cols: array of Tablecol; # column specs
rows: cyclic array of ref Tablerow; # row specs
cells: cyclic list of ref Tablecell; # the unique cells
totw: int; # total width
toth: int; # total height
caph: int; # caption height
availw: int; # used for previous 3 sizes
grid: cyclic array of array of ref Tablecell;
tabletok: ref Lex->Token; # token that started the table
flags: byte; # Lchanged
new: fn(tableid: int, align: Align, width: Dimen,
border, cellspacing, cellpadding: int, bg: Background, tok: ref Lex->Token) : ref Table;
};
# A table column info
Tablecol: adt
{
width: int;
align: Align;
pos: Draw->Point;
};
# A table row spec
Tablerow: adt
{
cells: cyclic list of ref Tablecell;
height: int;
ascent: int;
align: Align;
background: Background;
pos: Draw->Point;
flags: byte; # 0 or TFparsing
new: fn(align: Align, bg: Background, flags: byte) : ref Tablerow;
};
# A Tablecell is one cell of a table.
# It may span multiple rows and multiple columns.
# The (row,col) given indexes upper left corner of cell.
# Try to keep this under 17 words long.
Tablecell: adt
{
cellid: int; # serial no. of cell within table
content: cyclic ref Item; # contents before layout
layid: int; # identifies layout of cell
rowspan: int; # number of rows spanned by this cell
colspan: int; # number of cols spanned by this cell
align: Align; # alignment spec
flags: byte; # TFparsing, TFnowrap, TFisth
wspec: Dimen; # suggested width
hspec: int; # suggested height
background: Background; # cell background
minw: int; # minimum possible width
maxw: int; # maximum width
ascent: int;
row: int;
col: int;
pos: Draw->Point; # nw corner of cell contents, in cell
new: fn(cellid, rowspan, colspan: int, align: Align, wspec: Dimen,
hspec: int, bg: Background, flags: byte) : ref Tablecell;
};
# Align holds both a vertical and a horizontal alignment.
# Usually not all are possible in a given context.
# Anone means no dimension was specified
# alignment types
Anone, Aleft, Acenter, Aright, Ajustify, Achar, Atop, Amiddle, Abottom, Abaseline: con byte iota;
Align: adt
{
halign: byte; # one of Anone, Aleft, etc.
valign: byte; # one of Anone, Atop, etc.
};
# A Dimen holds a dimension specification, especially for those
# cases when a number can be followed by a % or a * to indicate
# percentage of total or relative weight.
# Dnone means no dimension was specified
# Dimen
# To fit in a word, use top bits to identify kind, rest for value
Dnone: con 0;
Dpixels: con 1<<29;
Dpercent: con 2<<29;
Drelative: con 3<<29;
Dkindmask: con 3<<29;
Dspecmask: con ~Dkindmask;
Dimen: adt
{
kindspec: int; # kind | spec
kind: fn(d: self Dimen) : int;
spec: fn(d: self Dimen) : int;
make: fn(kind, spec: int) : Dimen;
};
# Anchor is for info about hyperlinks that go somewhere
Anchor: adt
{
index: int; # serial no. of anchor within its doc
name: string; # name attr
href: ref Url->Parsedurl; # href attr
target: string; # target attr
events: list of Lex->Attr; # same as genattr.events of containing items
evmask: int;
};
# DestAnchor is for info about hyperlinks that are destinations
DestAnchor: adt
{
index: int; # serial no. of anchor within its doc
name: string; # name attr
item: ref Item; # the destination
};
# Maps (client side)
Map: adt
{
name: string; # map name
areas: list of Area; # hotzones
new: fn(name: string) : ref Map;
};
Area: adt
{
shape: string; # rect, circle, or poly
href: ref Url->Parsedurl; # associated hypertext link
target: string; # associated target frame
coords: array of Dimen; # coords for shape
};
# Background is either an image or a color.
# If both are set, the image has precedence.
Background: adt
{
image: ref Item.Iimage; # with state |= IFbkg
color: int; # RGB in lower 3 bytes
};
# Font styles
FntR, FntI, FntB, FntT, NumStyle: con iota;
# Font sizes
Tiny, Small, Normal, Large, Verylarge, NumSize: con iota;
NumFnt: con (NumStyle*NumSize);
DefFnt: con (FntR*NumSize+Normal);
# Lines are needed through some text items, for underlining or strikethrough
ULnone, ULunder, ULmid: con byte iota;
# List number types
LTdisc, LTsquare, LTcircle, LT1, LTa, LTA, LTi, LTI: con byte iota;
# Kidinfo flags
FRnoresize, FRnoscroll, FRhscroll, FRvscroll, FRhscrollauto, FRvscrollauto: con (1<<iota);
# Information about child frame or frameset
Kidinfo: adt {
isframeset: int;
# fields for "frame"
src: ref Url->Parsedurl; # only nil if a "dummy" frame or this is frameset
name: string; # always non-empty if this isn't frameset
marginw: int;
marginh: int;
framebd: int;
flags: int;
# fields for "frameset"
rows: array of Dimen;
cols: array of Dimen;
kidinfos: cyclic list of ref Kidinfo;
new: fn(isframeset: int) : ref Kidinfo;
};
# Document info (global information about HTML page)
Docinfo: adt {
# stuff from HTTP headers, doc head, and body tag
src: ref Url->Parsedurl; # original source of doc
base: ref Url->Parsedurl; # base URL of doc
referrer: ref Url->Parsedurl; # JavaScript document.referrer
doctitle: string; # from <title> element
background: Background; # background specification
backgrounditem: ref Item; # Image Item for doc background image, or nil
text: int; # doc foreground (text) color
link: int; # unvisited hyperlink color
vlink: int; # visited hyperlink color
alink: int; # highlighting hyperlink color
target: string; # target frame default
refresh: string; # content of <http-equiv=Refresh ...>
chset: string; # charset encoding
lastModified: string; # last-modified time
scripttype: int; # CU->TextJavascript, etc.
hasscripts: int; # true if scripts used
events: list of Lex->Attr; # event handlers
evmask: int;
kidinfo: ref Kidinfo; # if a frameset
frameid: int; # id of document frame
# info needed to respond to user actions
anchors: list of ref Anchor; # info about all href anchors
dests: list of ref DestAnchor; # info about all destination anchors
forms: list of ref Form; # info about all forms
tables: list of ref Table; # info about all tables
maps: list of ref Map; # info about all maps
images: list of ref Item; # all image items in doc
new: fn() : ref Docinfo;
reset: fn(f: self ref Docinfo);
};
# Parsing stuff
# Parsing state
Pstate: adt {
skipping: int; # true when we shouldn't add items
skipwhite: int; # true when we should strip leading space
curfont: int; # font index for current font
curfg: int; # current foreground color
curbg: Background; # current background
curvoff: int; # current baseline offset
curul: byte; # current underline/strike state
curjust: byte; # current justify state
curanchor: int; # current (href) anchor id (if in one), or 0
curstate: int; # current value of item state
literal: int; # current literal state
inpar: int; # true when in a paragraph-like construct
adjsize: int; # current font size adjustment
items: ref Item; # dummy head of item list we're building
lastit: ref Item; # tail of item list we're building
prelastit: ref Item; # item before lastit
fntstylestk: list of int; # style stack
fntsizestk: list of int; # size stack
fgstk: list of int; # text color stack
ulstk: list of byte; # underline stack
voffstk: list of int; # vertical offset stack
listtypestk: list of byte; # list type stack
listcntstk: list of int; # list counter stack
juststk: list of byte; # justification stack
hangstk: list of int; # hanging stack
new: fn() : ref Pstate;
};
# A source of Items (resulting of HTML parsing).
# After calling new with a ByteSource (which is past 'gethdr' stage),
# call getitems repeatedly until get nil. Errors are signalled by exceptions.
# Possible exceptions raised:
# EXInternal (start, getitems)
# exGeterror (getitems)
# exAbort (getitems)
ItemSource: adt
{
ts: ref Lex->TokenSource; # source of tokens
mtype: int; # media type (TextHtml or TextPlain)
doc: ref Docinfo; # global information about page
frame: ref Layout->Frame; # containing frame
psstk: list of ref Pstate; # local parsing state stack
nforms: int; # used to make formids
ntables: int; # used to make tableids
nanchors: int; # used to make anchor ids
nframes: int; # used to make names for frames
curform: ref Form; # current form (if in one)
curmap: ref Map; # current map (if in one)
tabstk: list of ref Table; # table stack
kidstk: list of ref Kidinfo; # kidinfo stack
reqdurl: ref Url->Parsedurl;
reqddata: array of byte;
toks: array of ref Lex->Token;
new: fn(bs: ref CharonUtils->ByteSource, f: ref Layout->Frame, mtype: int) : ref ItemSource;
getitems: fn(is: self ref ItemSource) : ref Item;
};
init: fn(cu: CharonUtils);
trim_white: fn(data: string): string;
};