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structure Stream :> STREAM = struct
type fileId = int
type fileOffset = int
type pos = fileId * fileOffset
type ppos = string * int * int option
type fileInfo = fileId * string * string
exception UngetcError
exception InvalidFileInfo
fun ppos2str (pos, line, col) =
let
val % = Int.toString
in
case col of
SOME col => pos ^ ":" ^ %line ^ ":" ^ %col
| NONE => pos ^ ":" ^ %line
end
type t = fileId * string * fileOffset * string
fun convert (fid, fname, _, contents) = (fid, fname, contents)
fun calcFilePos s offset =
let
fun calc s cur offset (line, col) =
if cur = offset then
(line, col)
else
calc s (cur + 1) offset
(if String.sub (s, cur) = #"\n" then (line + 1, 1)
else (line, col + 1))
in
calc s 0 offset (1, 1)
end
fun printPos (_, fname, contents) (_, pos) =
let
val (line, col) = calcFilePos contents pos
val line = Int.toString line
val col = Int.toString col
in
print $ fname ^ ":" ^ line ^ ":" ^ col ^ ": "
end
fun getchar (S as (fid, fname, off, contents)) =
if off < String.size contents then
(SOME $ String.sub (contents, off), (fid, fname, off + 1, contents))
else
(NONE, S)
fun ungetc (fid, fname, off, contents) =
if off = 0 then
raise UngetcError
else
(fid, fname, off - 1, contents)
fun getPosAfterCharRead (fid, _, off, _) = (fid, off - 1)
fun pos2pposWithFI (id, pos) (id', fname, contents) =
if id <> id' then
raise InvalidFileInfo
else
let
val (line, col) = calcFilePos contents pos
in
(fname, line, SOME col)
end
fun pos2ppos pos stream = pos2pposWithFI pos (convert stream)
fun pposWithoutCol (fname, line, SOME _) = (fname, line, NONE)
| pposWithoutCol (_, _, NONE) = raise Unreachable
fun getPos (id, _, off, _) = (id, off)
fun getSubstr startOff endOff (_, _, _, contents) =
String.substring (contents, startOff, endOff - startOff)
fun create fname =
let
open TextIO
val h = openIn fname
val contents = inputAll h
val () = closeIn h
in
(0, fname, 0, contents)
end
fun isFirstOnLine (_, offset) ((_, _, _, contents) : t) =
let
fun returnToNL ~1 = true
| returnToNL offset =
let
val chr = String.sub (contents, offset)
in
if chr = #"\n" then
true
else if Char.isSpace chr then
returnToNL (offset - 1)
else
false
end
in
returnToNL (offset - 1)
end
end
|
