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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 (* Pretty-printing Laconic/Web *)
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29
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30 structure Print :> PRINT = struct
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31
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32 structure SM = TextIOPP
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33 structure PD = PPDescFn(SM)
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34
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35 type 'a printer = 'a -> PD.pp_desc
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36
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37 fun box ds = PD.hovBox (PD.PPS.Rel 1, ds)
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38 fun parenIf b d =
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39 if b then
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40 box [PD.string "(", d, PD.string ")"]
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41 else
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42 d
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43 val space = PD.space 1
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44
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45 val out = SM.openOut {dst = TextIO.stdOut, wid = 70}
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46 val err = SM.openOut {dst = TextIO.stdErr, wid = 70}
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47
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48 fun p_list_sep sep f ls =
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49 case ls of
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50 [] => PD.string ""
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51 | [x] => f x
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52 | x :: rest =>
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53 let
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54 val tokens = foldr (fn (x, tokens) =>
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55 sep :: f x :: tokens)
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56 [] rest
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57 in
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58 box (f x :: tokens)
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59 end
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60 fun p_list f = p_list_sep (box [PD.string ",", space]) f
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61
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62 fun fprint f d = (PD.description (f, d);
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63 PD.PPS.flushStream f)
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64 val print = fprint out
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65 val eprint = fprint err
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66
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67 fun fpreface f (s, d) =
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68 fprint f (PD.hovBox (PD.PPS.Rel 0,
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69 [PD.string s, PD.space 1, d]))
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70
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71 val preface = fpreface out
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72 val epreface = fpreface err
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73
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74 fun fprefaces f ls =
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75 let
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76 val len = foldl (fn ((s, _), best) =>
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77 Int.max (size s, best)) 0 ls
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78 in
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79 app (fn (s, d) =>
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80 let
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81 val s = CharVector.tabulate (len - size s,
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82 fn _ => #" ")
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83 ^ s ^ ": "
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84 in
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85 fpreface f (s, d)
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86 end) ls
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87 end
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88
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89 val prefaces = fprefaces out
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90 val eprefaces = fprefaces err
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91
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92 end
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