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|
fun $ (x, y) = x y
infixr 0 $
fun printLn s = (print s; print "\n")
datatype token =
Number of substring |
Id of substring |
Plus |
Semicolon |
Hash |
CppInclude
fun printToken (Number s) = printLn $ "Number: " ^ Substring.string s
| printToken (Id s) = printLn $ "Id: " ^ Substring.string s
| printToken Plus = printLn "+"
| printToken Semicolon = printLn ";"
| printToken Hash = printLn "#"
| printToken CppInclude = printLn "$include"
type fileId = int
type fileOffset = int
type pos = fileId * fileOffset
type fullToken = pos * token
type stream = {
(* list of file ids, file names and file contents *)
allFiles: (fileId * string * string) list,
(* stack of file ids, file offsets and file contents *)
stack: (fileId * fileOffset * string) list
}
exception EndOfStream
exception EndOfFile
exception InvalidStream
exception InvalidStreamAdvance
fun calcFilePos s offset =
let
fun calc s cur offset (line, col) =
if cur = offset then
(line, col)
else
if String.sub (s, cur) = #"\n" then
calc s (cur + 1) offset (line + 1, 1)
else
calc s (cur + 1) offset (line, col + 1)
in
calc s 0 offset (1, 1)
end
fun printPos fileList (id, pos) =
let
val triple = List.find (fn (fid, _, _) => fid = id) fileList
in
case triple of
NONE => raise InvalidStream
| SOME (_, fname, contents) =>
let
val (line, col) = calcFilePos contents pos
val line = Int.toString line
val col = Int.toString col
in
print $ fname ^ ":" ^ line ^ ":" ^ col ^ ": "
end
end
fun readFile fname =
let
open TextIO
val h = openIn fname
val s = inputAll h
val () = closeIn h
in
s
end
fun getchar
(S as { stack = (id, off, contents) :: rest, allFiles }: stream)
: (char * stream) =
if off < String.size contents then
(String.sub (contents, off),
{ stack = (id, off + 1, contents) :: rest, allFiles })
else
raise EndOfFile
| getchar _ = raise EndOfStream
fun ungetc
(S as { stack = (id, off, contents) :: rest, allFiles }) =
if off = 0 then
raise InvalidStream
else
{ stack = (id, off - 1, contents) :: rest, allFiles }
| ungetc _ = raise InvalidStream
fun getOffset ({ stack = (id, off, contents) :: _, ... }: stream) = off
| getOffset _ = raise InvalidStream
fun getPosAfterCharRead
({ stack = (id, off, contents) :: _, ... }: stream) =
(id, off - 1)
| getPosAfterCharRead _ = raise InvalidStream
fun getPos ({ stack = (id, off, contents) :: _, ... }: stream) = (id, off)
| getPos _ = raise InvalidStream
fun getSubstr startOff endOff
({ stack = (_, _, contents) :: _, ... }: stream) =
Substring.substring (contents, startOff, endOff - startOff)
| getSubstr _ _ _ = raise InvalidStream
fun advanceToNewFile
(S as { stack = (id, off, contents) :: rest, allFiles }: stream) =
if off = String.size contents then
{ stack = rest, allFiles }
else
raise InvalidStreamAdvance
| advanceToNewFile _ = raise InvalidStreamAdvance
fun streamInit fname =
let
val contents = readFile fname
in
{ allFiles = [(0, fname, contents)], stack = [(0, 0, contents)] }
end
exception UnexpectedCharacter of char
fun isSpace c = c = #" " orelse c = #"\t" orelse c = #"\n"
fun isLetter c =
ord c >= ord #"a" andalso ord c <= ord #"z" orelse
ord c >= ord #"A" andalso ord c <= ord #"Z"
fun isIdStart c = c = #"_" orelse isLetter c
fun isDigit c = ord c >= ord #"0" andalso ord c <= ord #"9"
fun isIdBody c = isIdStart c orelse isDigit c
fun isFirstOnLine (tk: fullToken) (stream: stream) =
let
val (id, offset) = #1 tk
in
case List.find (fn (fid, _, _) => id = fid) (#allFiles stream) of
NONE => raise InvalidStream
| SOME (_, _, contents) =>
let
fun returnToNL ~1 = true
| returnToNL offset =
let
val chr = String.sub (contents, offset)
in
if chr = #"\n" then
true
else if isSpace chr then
returnToNL (offset - 1)
else
false
end
in
returnToNL (offset - 1)
end
end
fun tokenize stream tkl =
let
fun getcharSkipEof stream = getchar stream handle
EndOfFile => getcharSkipEof (advanceToNewFile stream)
val (c, stream) = (fn (c, s) => (SOME c, s)) $ getcharSkipEof stream
handle
EndOfStream => (NONE, stream)
fun % tk = (getPosAfterCharRead stream, tk)
in
case c of
NONE => (rev tkl, #allFiles stream)
| SOME c =>
if isSpace c then
tokenize stream tkl
else if isIdStart c then
parseId c stream tkl
else case c of
#"+" => tokenize stream (% Plus :: tkl)
| #";" => tokenize stream (% Semicolon :: tkl)
| #"#" => tokenize stream (% Hash :: tkl)
| _ => raise UnexpectedCharacter c
end and
parseId c stream (tkl: fullToken list) =
let
val P as (_, pos) = getPosAfterCharRead stream
fun eatId curId stream =
let
val (c, stream) = (fn (c, s) => (SOME c, s)) $ getchar stream handle
_ => (NONE, stream)
in
case c of
NONE => (curId, stream)
| SOME c =>
if isIdBody c then
eatId (curId + 1) stream
else
(curId, ungetc stream)
end
val (endOffset, stream) = eatId (pos + 1) stream
val id = getSubstr pos endOffset stream
in
if ((fn Hash => true | _ => false) (#2 $ hd tkl) handle Empty => false)
andalso isFirstOnLine (hd tkl) stream
andalso Substring.string id = "include"
then
tokenize stream (((#1 $ hd tkl), CppInclude) :: tl tkl)
else
tokenize stream ((P, Id id) :: tkl)
end
fun main [fname] =
let
val stream = streamInit fname
val (tkl, fileList) = tokenize stream []
in
List.app (fn (p, x) => (printPos fileList p; printToken x)) tkl
end
| main _ = printLn "Expected a signle argument: file name"
val () = main $ CommandLine.arguments ()
|
