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#line 8 "docs2comments.nw"
global format, subst, firstline, lastline, allchunks, chunks, width
record wrap(l, r) # put fore and aft of line
record breakup(strings) # split up these strings with spaces
record tr(old, new) # translate old chars to new
global left_quote, right_quote
procedure main(args)
format := wrap("/* ", " */")
subst := breakup(["/*","*/"])
width := 80
left_quote := "[["
right_quote := "]]"
while a := get(args) do
case a of {
"-ml" | "-m3" : (format := wrap("(* ", " *)"), subst := breakup(["(*", "*)"]))
"-awk" | "-icn" | "-icon" : format := wrap("# ")
"-lisp" | "-scm" : format := wrap(";;; ")
"-c++" : format := wrap("// ")
"-c" : { format := wrap(" * "); firstline := "/*"; lastline := " */"
subst := breakup(["/*", "*/"])
}
"-ocamlweb" : { format := wrap(" "); firstline := "(*"; lastline := " *)"
subst := breakup(["(*", "*)"])
left_quote := "["; right_quote := "]"
}
"-pascal" : { format := wrap("{ ", " }"); subst := tr("{}", "--") }
"-f77" : format := wrap("C ")
"-f90" : format := wrap("! ")
"-tex" : format := wrap("%% ")
"-lua" : format := wrap("-- ")
"-all" : allchunks := 1
"-one" : allchunks := &null
default :
a ?
if (="-w", width <- integer(tab(many(&digits))), pos(0)) then
&null
else if ="-L" then
&null # deliberately ignore requests for #line
else {
write("@fatal unknown argument '", a, "' to docs2comments")
exit(1)
}
}
#line 96 "docs2comments.nw"
chunks := []
while line := read() do
line ?
if ="@end docs" | ="@end code" then {
if (\holding)[-1] == "" then pull (holding)
put(chunks, code(preceding_defn, \defn_pending, holding) | docs(holding))
## if type(chunks[-1]) == "code" then
## every write("##### " || (
## "preceding defn is " || image(preceding_defn) |
## "defn pending is " || image(defn_pending) |
## "Holding chunk with these lines:" | image(!holding)))
defn_pending := &null
holding := &null
chunks := drain(chunks)
} else if ="@begin docs" then {
indocs := 1
holding := [""]
} else if ="@begin code" then {
indocs := &null
holding := [""]
} else if \indocs then {
if ="@text " then {
grab(tab(0), holding)
} else if ="@quote" & pos(0) then {
grab(left_quote, holding)
} else if ="@endquote" & pos(0) then {
grab(right_quote, holding)
} else if ="@nl" & pos(0) then {
put(\holding, "")
}
} else if ="@defn " then {
defn_pending := tab(0)
if holding[-1] == "" then pull (holding)
preceding_defn := holding
holding := []
} else {
if match("@xref ") & (\holding)[-1] == "" then pull(holding)
put(\holding, line)
}
drain(put(chunks, docs([])))
#line 53 "docs2comments.nw"
return
end
#line 57 "docs2comments.nw"
procedure insert_blanks(s, bad)
s ? {
r := ""
while r ||:= tab(find(bad)) do {
r ||:= bad[1]
every i := 2 to *bad do r ||:= " " || bad[i]
=bad
}
return r || tab(0)
}
end
#line 70 "docs2comments.nw"
procedure comment(s)
case type(subst) of {
"breakup" : every s := insert_blanks(s, !subst.strings)
"tr" : s := map(s, subst.old, subst.new)
"null" : &null
default : stop("unknown substitution of type ", type(subst))
}
if /format.r then
return format.l || s
else {
if *s < width then s ||:= repl(" ", width - *s)
return format.l || s || format.r
}
end
#line 88 "docs2comments.nw"
procedure grab(s, holding)
return (\holding)[-1] := holding[-1] || s
end
record docs(lines)
record code(preceding, defn, lines)
#line 138 "docs2comments.nw"
procedure emit_as_comments(c)
type(c) == "docs" | runerr(1, "Unexpected code chunk")
every write("@text ", comment(trailing_nonblank(\c.lines)), "\n@nl")
return
end
procedure trailing_nonblank(l)
local suspended
every s := !l do
if \suspended | *s > 0 then {
suspended := 1
suspend s
}
end
procedure drain(chunks)
static n
initial n := -1
if type(c := chunks[-2]) == "code" then {
write("@begin code ", n +:= 1)
every write(!c.preceding | ("@defn " || c.defn) | "@nl")
write("@text ", \firstline, "\n@nl")
every i := (if \allchunks then 1 else *chunks -2) to *chunks - 2 do
emit_as_comments(chunks[i])
write("@text ", comment("<" || c.defn || ">="), "\n@nl")
write("@text ", \lastline, "\n@nl")
copyxreflines(\c.lines)
bad := &null
(bad := get(\c.lines)) == "@nl" |
{ write(&errout, "expected newline after definition; got ", image(bad));
runerr(1, bad) }
every write(!c.lines)
c := chunks[-1]
if type(c) == "docs" & upto(\c.lines[1], ~' \n\t') then {
write("@text ", \firstline, "\n@nl")
emit_as_comments(c)
write("@text ", \lastline, "\n@nl")
write("@nl")
chunks := []
} else
chunks := [c]
write("@end code ", n)
}
return chunks
end
procedure copyxreflines(l)
while match("@xref ", l[1]) do {
#write(&errout, "COPYING ", image(l[1]))
get(l) #write(get(l))
}
return
end
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