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(* Copyright (c) 2008, Adam Chlipala
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - The names of contributors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*)
structure ErrorMsg :> ERROR_MSG = struct
type pos = {line : int,
char : int}
type span = {file : string,
first : pos,
last : pos}
type 'a located = 'a * span
fun posToString {line, char} =
String.concat [Int.toString line, ":", Int.toString char]
fun spanToString {file, first, last} =
String.concat [file, ":", posToString first, "-", posToString last]
val dummyPos = {line = 0,
char = 0}
val dummySpan = {file = "",
first = dummyPos,
last = dummyPos}
val file = ref ""
val numLines = ref 1
val lines : int list ref = ref []
fun resetPositioning fname = (file := fname;
numLines := 1;
lines := [])
fun newline pos = (numLines := !numLines + 1;
lines := pos :: !lines)
fun lastLineStart () =
case !lines of
[] => 0
| n :: _ => n+1
fun posOf n =
let
fun search lineNum lines =
case lines of
[] => {line = 1,
char = n}
| bound :: rest =>
if n > bound then
{line = lineNum,
char = n - bound - 1}
else
search (lineNum - 1) rest
in
search (!numLines) (!lines)
end
fun spanOf (pos1, pos2) = {file = !file,
first = posOf pos1,
last = posOf pos2}
val errors = ref false
fun resetErrors () = errors := false
fun anyErrors () = !errors
fun error s = (TextIO.output (TextIO.stdErr, s);
TextIO.output1 (TextIO.stdErr, #"\n");
errors := true)
fun errorAt span s = (TextIO.output (TextIO.stdErr, spanToString span);
TextIO.output (TextIO.stdErr, ": ");
error s)
fun errorAt' span s = errorAt (spanOf span) s
end
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