ref: 76b565d8b219c8db94a882e93725b4ab735414de
dir: /appl/lib/parseman.b/
implement Parseman;
include "sys.m";
sys: Sys;
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
include "man.m";
FONT_LITERAL: con -1;
init(): string
{
sys = load Sys Sys->PATH;
bufio = load Bufio Bufio->PATH;
if (bufio == nil)
return sys->sprint("cannot load module: %r");
return nil;
}
ParseState: adt[T]
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}{
metrics: Metrics;
ql: int; # quote Literal text
margin: int;
mstack: list of int;
istack: list of int;
indent: int;
ntlsetindent: int; #copy prevailindent to indent on n.t.l
prevailindent: int;
curfont: int;
curattr: int;
verbatim: int;
pspace: int;
curline: list of (int, Text); # most recent first
curwidth: int;
newpara: int;
heading: int;
igto: string;
link: string;
viewer: T;
setline: chan of list of (int, Text);
# addstring() is simply an addtext() of the current font
addstring: fn(s: self ref ParseState, s: string);
addtext: fn(s: self ref ParseState, t: list of Text);
brk: fn(s: self ref ParseState);
paragraph: fn( s: self ref ParseState);
};
parseman[T](fd: ref Sys->FD, metrics: Metrics, ql: int, viewer: T, setline: chan of list of (int, Text))
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}
{
iob := bufio->fopen(fd, Sys->OREAD);
state := ref ParseState[T](metrics, ql, 0, nil, nil, 0, 0, metrics.indent, FONT_ROMAN, 0, 0, 1, nil, 0, 1, 0, "", nil, viewer, setline);
while ((l := iob.gets('\n')) != nil) {
if (l[len l -1] == '\n')
l = l[0: len l - 1];
if (state.igto != nil && state.igto != l)
continue;
state.igto = nil;
parseline(state, l);
}
state.pspace = 2;
state.pspace = 1;
state.paragraph();
footer := Text(FONT_ROMAN, 0, "Inferno Manual", 0, nil);
textw := state.viewer.textwidth(footer);
#should do 'center' in addtext (state.justify = CENTER)
state.indent = (state.metrics.pagew - textw) / 2;
state.addtext(footer::nil);
state.brk();
setline <- = nil;
}
parseline[T](state: ref ParseState[T], t: string)
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}
{
if (t == nil) {
if (state.verbatim) {
blank := Text(state.curfont, state.curattr, "", 0, "");
state.setline <- = (0, blank)::nil;
} else
state.paragraph();
return;
}
ntlsetindent := state.ntlsetindent;
state.ntlsetindent = 0;
if (t[0] == '.' || t[0] == '\'')
parsemacro(state, t[1:]);
else {
state.addtext(parsetext(state, t));
if (state.verbatim)
state.brk();
}
if (ntlsetindent) {
state.indent = state.prevailindent;
if (state.curwidth + state.metrics.en > state.indent + state.margin)
state.brk();
}
}
parsemacro[T](state: ref ParseState[T], t: string)
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}
{
for (n := 0; n < len t && n < 2; n++)
if (t[n] == ' ' || t[n] == '\t')
break;
macro := t[0:n];
params: list of string;
quote := 0;
param := 0;
esc := 0;
p := "";
for (; n < len t; n++) {
if (esc)
esc = 0;
else {
case t[n] {
' ' or '\t' =>
if (!quote) {
if (param) {
params = p :: params;
p = "";
param = 0;
}
continue;
}
'"' =>
param = 1;
quote = !quote;
continue;
'\\' =>
esc = 1;
}
}
param = 1;
p[len p] = t[n];
}
if (param)
params = p :: params;
plist: list of string;
for (; params != nil; params = tl params)
plist = hd params :: plist;
params = plist;
case macro {
"ig" =>
igto := "..";
if (params != nil)
igto = "." + hd params;
state.brk();
state.igto = igto;
"sp" =>
sp := "1";
if(params != nil)
sp = hd params;
d := tval(state.metrics, sp, 'v');
gap := d / state.metrics.V;
if (gap < 1)
gap = 1;
while (gap--)
state.paragraph();
"br" =>
state.brk();
"nf" =>
state.verbatim = 1;
"fi" =>
state.verbatim = 0;
"ti" =>
state.brk();
#i := 0;
#if(params != nil)
# i = tval(state.metrics, hd params, 'n');
#state.ntlsetindent = 1;
#state.prevailindent = i;
"in" =>
state.brk();
#i := 0;
#if(params != nil)
# i = tval(state.metrics, hd params, 'n');
#state.indent = i;
#state.prevailindent = state.indent;
"1C" =>
state.brk();
# not implemented
"2C" =>
state.brk();
# not implemented
"BI" =>
altattr(state, FONT_BOLD, FONT_ITALIC, params);
"BR" =>
altattr(state, FONT_BOLD, FONT_ROMAN, params);
"IB" =>
altattr(state, FONT_ITALIC, FONT_BOLD, params);
"IR" =>
# need to determine link if params of valid form
state.link = convlink(params);;
altattr(state, FONT_ITALIC, FONT_ROMAN, params);
state.link = nil;
"RB" =>
altattr(state, FONT_ROMAN, FONT_BOLD, params);
"RI" =>
altattr(state, FONT_ROMAN, FONT_ITALIC, params);
"B" =>
state.curfont = FONT_BOLD;
if (params != nil) {
for (; params != nil; params = tl params) {
textl := parsetext(state, hd params);
for (; textl != nil; textl = tl textl)
state.addtext(hd textl::nil);
}
state.curfont = FONT_ROMAN;
}
"I" =>
state.curfont = FONT_ITALIC;
if (params != nil) {
for (; params != nil; params = tl params) {
textl := parsetext(state, hd params);
for (; textl != nil; textl = tl textl)
state.addtext(hd textl::nil);
}
state.curfont = FONT_ROMAN;
}
"SM"=>
state.curattr |= ATTR_SMALL;
if (params != nil) {
for (; params != nil; params = tl params)
state.addstring(hd params);
state.curattr &= ~ATTR_SMALL;
}
"L" =>
state.curfont = FONT_LITERAL;
if (params != nil) {
str := "`";
for (pl := params; pl != nil;) {
str += hd pl;
if ((pl = tl pl) != nil)
str += " ";
else
break;
}
str += "'";
state.addstring(str);
state.curfont = FONT_ROMAN;
}
"LR" =>
if (params != nil) {
l := Text(FONT_LITERAL, state.curattr, hd params, 0, nil);
t: list of Text;
params = tl params;
if (params == nil)
t = l :: nil;
else {
r := Text(FONT_ROMAN, state.curattr, hd params, 0, nil);
t = l :: r :: nil;
}
state.addtext(t);
}
"RL" =>
if (params != nil) {
r := Text(FONT_ROMAN, state.curattr, hd params, 0, nil);
t: list of Text;
params = tl params;
if (params == nil)
t = r :: nil;
else {
l := Text(FONT_LITERAL, state.curattr, hd params, 0, nil);
t = r :: l :: nil;
}
state.addtext(t);
}
"DT" =>
# not yet supported
;
"EE" =>
state.brk();
state.verbatim = 0;
state.curfont = FONT_ROMAN;
"EX" =>
state.brk();
state.verbatim = 1;
state.curfont = FONT_BOLD;
"HP" =>
state.paragraph();
i := state.metrics.indent;
if (params != nil)
i = tval(state.metrics, hd params, 'n');
state.prevailindent = state.indent + i;
"IP" =>
state.paragraph();
i := state.metrics.indent;
if (params != nil) {
tag := hd params;
params = tl params;
state.addtext(parsetext(state, tag));
if (params != nil)
i = tval(state.metrics, hd params, 'n');
}
state.indent = state.metrics.indent + i;
state.prevailindent = state.indent;
"PD" =>
state.pspace = 1;
if (params != nil) {
v := tval(state.metrics, hd params, 'v') / state.metrics.V;
state.pspace = v;
}
"LP" or "PP" =>
state.paragraph();
state.prevailindent = state.indent;
"RE" =>
state.brk();
if (state.mstack == nil || state.istack == nil)
break;
state.margin = hd state.mstack;
state.mstack = tl state.mstack;
state.prevailindent = hd state.istack;
state.indent = state.prevailindent;
state.istack = tl state.istack;
"RS" =>
state.brk();
i := state.prevailindent - state.metrics.indent;
if (params != nil)
i = tval(state.metrics, hd params, 'n');
state.mstack = state.margin :: state.mstack;
state.istack = state.prevailindent :: state.istack;
state.margin += i;
state.indent = 2 * state.metrics.indent;
state.prevailindent = state.indent;
"SH" =>
state.paragraph();
state.prevailindent = state.indent;
state.curfont = FONT_ROMAN;
state.curattr = 0;
state.indent = 0;
state.heading = 1;
state.verbatim = 0;
for (pl := params; pl != nil; pl = tl pl)
state.addstring(hd pl);
state.heading = 0;
state.brk();
state.newpara = 1;
state.pspace = 1;
"SS" =>
state.paragraph();
state.prevailindent = state.indent;
state.curfont = FONT_ROMAN;
state.curattr = 0;
state.indent = state.metrics.ssindent;
state.heading = 2;
for (pl := params; pl != nil; pl = tl pl)
state.addstring(hd pl);
state.heading = 0;
state.brk();
state.newpara = 1;
state.pspace = 1;
"TF" =>
state.brk();
state.pspace = 0;
i := state.metrics.indent;
if (params != nil) {
str := hd params;
text := Text(FONT_BOLD, 0, str, 0, nil);
w := state.viewer.textwidth(text) + 2*state.metrics.em;
if (w > i)
i = w;
}
state.indent = state.metrics.indent;;
state.prevailindent = state.indent + i;
"TH" =>
state.brk();
if (len params < 2)
break;
str := hd params + "(" + hd tl params + ")";
txt := Text(FONT_ROMAN, 0, str, 0, nil);
txtw := state.viewer.textwidth(txt);
state.indent = 0;
state.addtext(txt::nil);
state.indent = state.metrics.pagew - txtw;
state.addtext(txt::nil);
state.indent = 0;
state.brk();
"TP" =>
state.paragraph();
if (state.prevailindent == state.metrics.indent)
state.prevailindent += state.metrics.indent;
state.indent = state.metrics.indent;
state.ntlsetindent = 1;
if (params != nil) {
i := tval(state.metrics, hd params, 'n');
if (i == 0)
i = state.metrics.indent;
state.prevailindent = state.indent + i;
}
* =>
;
}
if (state.verbatim)
state.brk();
}
parsetext[T](state: ref ParseState[T], t: string): list of Text
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}
{
# need to do better here - spot inline font changes etc
# we also currently cannot support troff tab stops
textl: list of Text;
line := "";
curfont := state.curfont;
prevfont := state.curfont; # should perhaps be in State
step := 1;
for (i := 0; i < len t; i += step) {
step = 1;
ch := t[i];
if (ch == '\\') {
i++;
width := len t - i;
if (width <= 0)
break;
case t[i] {
'-' or '.' or '\\' =>
ch = t[i];
' ' =>
ch = ' ';
'e' =>
ch = '\\';
'|' or '&' =>
continue;
'(' =>
if (width > 3)
width = 3;
step = width;
if (step != 3)
continue;
case t[i+1:i+3] {
"bu" =>
ch = '•';
"em" =>
ch = '—';
"mi" =>
ch = '-';
"mu" =>
ch = '×';
"*m" =>
ch = 'µ';
"*G" =>
ch = 'Γ';
"*p" =>
ch = 'π';
"*b" =>
ch = 'β';
"<=" =>
ch = '≤';
"->" =>
ch = '→';
* =>
continue;
}
'f' =>
if (width == 1)
continue;
if (t[i+1] == '(') {
if (width > 4)
width = 4;
step = width;
continue;
}
i++;
case t[i] {
'0' or 'R' =>
curfont = FONT_ROMAN;
'1' or 'I' =>
curfont = FONT_ITALIC;
'2' =>
# should be bold but our 'bold' font is constant width
curfont = FONT_ROMAN;
'5' or 'L' =>
curfont = FONT_BOLD;
'P' =>
curfont = prevfont;
}
continue;
'*' =>
if (width == 1)
continue;
case t[i+1] {
'R' =>
step = 2;
ch = '®';
'(' =>
if (width > 4)
width = 4;
step = width;
continue;
}
* =>
i--;
}
}
if (curfont != state.curfont) {
if (line != "") {
txt := Text(state.curfont, state.curattr, line, state.heading, state.link);
line = "";
textl = txt :: textl;
}
prevfont = state.curfont;
state.curfont = curfont;
}
line[len line] = ch;
}
if (line != "") {
txt := Text(state.curfont, state.curattr, line, state.heading, state.link);
textl = txt :: textl;
}
state.curfont = curfont;
r: list of Text;
for (; textl != nil; textl = tl textl)
r = hd textl :: r;
return r;
}
ParseState[T].addstring(state: self ref ParseState[T], s: string)
{
t := Text(state.curfont, state.curattr, s, state.heading, state.link);
state.addtext(t::nil);
}
ParseState[T].addtext(state: self ref ParseState[T], t: list of Text)
{
#dumptextlist(t);
# on setting a line copy state.prevailindent to state.indent
#
# always make sure that current indent is achieved
#
# if FONT_LITERAL and state.ql then convert to FONT_BOLD and
# quote the text before any other processing
state.newpara = 0;
addspace := 1;
while (t != nil) {
# this scheme is inadequate...
# results in mixed formatting at end of line getting split up
# e.g.
# .IR man (1)
# can get split at the '('
indent := 0;
spacew := 0;
text := hd t;
t = tl t;
if (state.indent + state.margin > state.curwidth || state.curline == nil) {
indent = state.indent + state.margin;
state.curwidth = indent;
addspace = 0;
if (!state.verbatim) {
text.text = trim(text.text);
while (text.text == "" && t != nil) {
text = hd t;
t = tl t;
text.text = trim(text.text);
}
}
}
if (text.font == FONT_LITERAL) {
if (state.ql)
text.text = "`" + text.text + "'";
text.font = FONT_BOLD;
}
if (addspace) {
(nil, previtem) := hd state.curline;
if (previtem.text[len previtem.text -1] == ' ')
addspace = 0;
else {
space := Text(previtem.font, previtem.attr, " ", 0, nil);
spacew = state.viewer.textwidth(space);
}
}
# it doesn't fit - try to word wrap...
t2 := text;
end := len text.text;
prevend := end;
nextstart := 0;
while (end > 0) {
t2.text = text.text[0:end];
tlen := state.viewer.textwidth(t2);
if (state.verbatim || state.curwidth + spacew + tlen <= state.metrics.pagew) {
# easy - just add it!
state.curwidth += spacew+tlen;
if (addspace) {
t2.text = " " + t2.text;
addspace = 0;
}
state.curline = (indent, t2) :: state.curline;
indent = 0;
break;
}
prevend = end;
for (; end > 0; end--) {
if (t2.text[end-1] == ' ') {
nextstart = end;
for (; end >0 && t2.text[end-1] == ' '; end--)
;
break;
}
}
}
if (end != len text.text) {
# couldn't fit whole item onto line
if (state.curline == nil) {
# couldn't fit (sub)item on empty line - add it anyway
# as there is nowhere else to put it
end = prevend;
t2.text = text.text[0:end];
state.curline = (indent, t2) :: state.curline;
if (nextstart != 0) {
text.text = text.text[nextstart:];
t = text :: t;
}
} else {
# already stuff on line and we have consumed upto nexstart of
# the current item
if (end != 0)
text.text = text.text[nextstart:];
t = text :: t;
}
state.brk();
}
addspace = 0;
}
}
trim(s: string): string
{
for (spi :=0; spi < len s && s[spi] == ' '; spi++)
;
return s[spi:];
}
ParseState[T].brk(state: self ref ParseState)
{
if (state.curline != nil) {
line: list of (int, Text);
for (l := state.curline; l != nil; l = tl l)
line = hd l :: line;
state.setline <- = line;
state.curline = nil;
state.curwidth = 0;
}
state.indent = state.prevailindent;
}
ParseState[T].paragraph(state: self ref ParseState)
{
state.brk();
if (state.newpara == 0) {
blank := Text(state.curfont, state.curattr, "", 0, "");
for (i := 0; i < state.pspace; i++)
state.setline <- = (0, blank)::nil;
state.newpara = 1;
}
state.curattr = 0;
state.curfont = FONT_ROMAN;
state.indent = state.metrics.indent;
# state.prevailindent = state.indent;
state.ntlsetindent = 0;
}
# convert troff 'values' into output 'dots'
tval(m: Metrics, v: string, defunits: int): int
{
if (v == nil)
return 0;
units := v[len v -1];
val: real;
case units {
'i' or
'c' or
'P' or
'm' or
'n' or
'p' or
'u' or
'v' =>
val = real v[0:len v - 1];
* =>
val = real v;
units = defunits;
}
r := 0;
case units {
'i' =>
r = int (real m.dpi * val);
'c' =>
r = int ((real m.dpi * val)/2.54);
'P' =>
r = int ((real m.dpi * val)/ 6.0);
'm' =>
r = int (real m.em * val);
'n' =>
r = int (real m.en * val);
'p' =>
r = int ((real m.dpi * val)/72.0);
'u' =>
r = int val;
'v' =>
r = int (real m.V * val);
}
return r;
}
altattr[T](state: ref ParseState[T], f1, f2: int, strs: list of string)
for{
T =>
textwidth: fn(t: self T, text: Text): int;
}
{
index := 0;
textl: list of Text;
prevfont := state.curfont;
for (; strs != nil; strs = tl strs) {
str := hd strs;
f := f1;
if (index++ & 1)
f = f2;
state.curfont = f;
newtext := parsetext(state, str);
for (; newtext != nil; newtext = tl newtext)
textl = hd newtext :: textl;
}
orderedtext: list of Text;
for (; textl != nil; textl = tl textl)
orderedtext = hd textl :: orderedtext;
state.addtext(orderedtext);
state.curfont = prevfont;
}
dumptextlist(t: list of Text)
{
sys->print("textlist[");
for (; t != nil; t = tl t) {
s := hd t;
sys->print("(%s)", s.text);
}
sys->print("]\n");
}
convlink(params: list of string): string
{
# merge the texts
s := "";
for (; params != nil; params = tl params)
s = s + (hd params);
for (i := 0; i < len s; i ++)
if (s[i] == '(')
break;
if (i+1 >= len s)
return nil;
cmd := s[0:i];
i++;
s = s[i:];
for (i = 0; i < len s; i++)
if (s[i] == ')')
break;
section := s[0:i];
if (section == nil || !isint(section))
return nil;
return section + " " + cmd;
}
isint(s: string): int
{
for (i := 0; i < len s; i++)
if (s[i] != '.' && (s[i] < '0' || s[i] > '9'))
return 0;
return 1;
}