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1 (* Copyright (c) 2008, Adam Chlipala
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2 * All rights reserved.
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3 *
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4 * Redistribution and use in source and binary forms, with or without
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5 * modification, are permitted provided that the following conditions are met:
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6 *
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7 * - Redistributions of source code must retain the above copyright notice,
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8 * this list of conditions and the following disclaimer.
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9 * - Redistributions in binary form must reproduce the above copyright notice,
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10 * this list of conditions and the following disclaimer in the documentation
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11 * and/or other materials provided with the distribution.
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12 * - The names of contributors may not be used to endorse or promote products
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13 * derived from this software without specific prior written permission.
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14 *
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15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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25 * POSSIBILITY OF SUCH DAMAGE.
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26 *)
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27
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28 structure ErrorMsg :> ERROR_MSG = struct
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29
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30 type pos = {line : int,
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31 char : int}
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32
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33 type span = {file : string,
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34 first : pos,
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35 last : pos}
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36
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37 type 'a located = 'a * span
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38
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39
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40 fun posToString {line, char} =
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41 String.concat [Int.toString line, ":", Int.toString char]
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42
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43 fun spanToString {file, first, last} =
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44 String.concat [file, ":", posToString first, "-", posToString last]
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45
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46 val dummyPos = {line = 0,
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47 char = 0}
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48 val dummySpan = {file = "",
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49 first = dummyPos,
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50 last = dummyPos}
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51
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52
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53 val file = ref ""
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54 val numLines = ref 1
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55 val lines : int list ref = ref []
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56
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57 fun resetPositioning fname = (file := fname;
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58 numLines := 1;
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59 lines := [])
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60
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61 fun newline pos = (numLines := !numLines + 1;
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62 lines := pos :: !lines)
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63
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64 fun lastLineStart () =
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65 case !lines of
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66 [] => 0
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67 | n :: _ => n+1
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68
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69 fun posOf n =
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70 let
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71 fun search lineNum lines =
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72 case lines of
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73 [] => {line = 1,
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74 char = n}
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75 | bound :: rest =>
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76 if n > bound then
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77 {line = lineNum,
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78 char = n - bound - 1}
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79 else
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80 search (lineNum - 1) rest
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81 in
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82 search (!numLines) (!lines)
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83 end
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84
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85 fun spanOf (pos1, pos2) = {file = !file,
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86 first = posOf pos1,
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87 last = posOf pos2}
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88
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89
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90 val errors = ref false
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91
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92 fun resetErrors () = errors := false
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93 fun anyErrors () = !errors
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94 fun error s = (TextIO.output (TextIO.stdErr, s);
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95 TextIO.output1 (TextIO.stdErr, #"\n");
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96 errors := true)
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97 fun errorAt span s = (TextIO.output (TextIO.stdErr, spanToString span);
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98 TextIO.output (TextIO.stdErr, ": ");
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99 error s)
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100 fun errorAt' span s = errorAt (spanOf span) s
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101
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102 end
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