-- Copyright (C) 2011, Gabriel Dos Reis.
-- All rights reserved.
--
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-- 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.
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--     - Redistributions in binary form must reproduce the above copyright
--       notice, this list of conditions and the following disclaimer in
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--       distribution.
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--     - Neither the name of The Numerical Algorithms Group Ltd. nor the
--       names of its contributors may be used to endorse or promote products
--       derived from this software without specific prior written permission.
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-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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--

import initial_-env
namespace BOOTTRAN
module utility (objectMember?, symbolMember?, stringMember?,
  charMember?, scalarMember?, listMember?)

objectMember?(x,l) ==
  cons? l => sameObject?(x,first l) or objectMember?(x,rest l)
  sameObject?(x,l)

symbolMember?(s,l) ==
  repeat
    l = nil => return false
    cons? l =>
      symbolEq?(s,first l) => return true
      l := rest l
    return symbolEq?(s,l)

stringMember?(s,l) ==
  repeat
    l = nil => return false
    cons? l =>
      stringEq?(s,first l) => return true
      l := rest l
    return stringEq?(s,l)

charMember?(c,l) ==
  repeat
    l = nil => return false
    cons? l =>
      charEq?(c,first l) => return true
      l := rest l
    return charEq?(c,l)

scalarMember?(s,l) ==
  repeat
    l = nil => return false
    cons? l =>
      scalarEq?(s,first l) => return true
      l := rest l
    return scalarEq?(s,l)

listMember?(x,l) ==
  repeat
    l = nil => return false
    cons? l =>
      listEq?(x,first l) => return true
      l := rest l
    return listEq?(x,l)