axiom-source 20170501-3 / usr / share / axiom-20170501 / src / algebra / CHAR.spad

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)abbrev domain CHAR Character
++ Author: Stephen M. Watt
++ Date Created: July 1986
++ Date Last Updated: June 20, 1991
++ Description:
++ This domain provides the basic character data type.

Character() : SIG == CODE where

  SIG ==> OrderedFinite() with

    ord : % -> Integer
      ++ord(c) provides an integral code corresponding to the
      ++character c.  It is always true that \spad{char ord c = c}.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [ord c for c in chars]

    char : Integer  -> %
      ++char(i) provides a character corresponding to the integer
      ++code i. It is always true that \spad{ord char i = i}.
      ++
      ++X [char c for c in [97,65,88,56,43]]

    char : String   -> %
      ++char(s) provides a character from a string s of length one.
      ++
      ++X [char c for c in ["a","A","X","8","+"]]

    space : () -> %
      ++space() provides the blank character.
      ++
      ++X space()

    quote : () -> %
      ++quote() provides the string quote character, \spad{"}.
      ++
      ++X quote()

    escape : () -> %
      ++escape() provides the escape character, \spad{_}, which
      ++is used to allow quotes and other characters within strings.
      ++
      ++X escape()

    upperCase : % -> %
      ++upperCase(c) converts a lower case letter to the corresponding
      ++upper case letter.  If c is not a lower case letter, then
      ++it is returned unchanged.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [upperCase c for c in chars]

    lowerCase : % -> %
      ++lowerCase(c) converts an upper case letter to the corresponding
      ++lower case letter.  If c is not an upper case letter, then
      ++it is returned unchanged.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [lowerCase c for c in chars]

    digit? : % -> Boolean
      ++digit?(c) tests if c is a digit character, for example, one of 0..9.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [digit? c for c in chars]

    hexDigit? : % -> Boolean
      ++hexDigit?(c) tests if c is a hexadecimal numeral,
      ++for example, one of 0..9, a..f or A..F.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [hexDigit? c for c in chars]

    alphabetic? : % -> Boolean
      ++alphabetic?(c) tests if c is a letter,
      ++for example, one of a..z or A..Z.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [alphabetic? c for c in chars]

    upperCase? : % -> Boolean
      ++upperCase?(c) tests if c is an upper case letter,
      ++for example, one of A..Z.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [upperCase? c for c in chars]

    lowerCase? : % -> Boolean
      ++lowerCase?(c) tests if c is an lower case letter,
      ++for example, one of a..z.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [lowerCase? c for c in chars]

    alphanumeric? : % -> Boolean
      ++alphanumeric?(c) tests if c is either a letter or number,
      ++for example, one of 0..9, a..z or A..Z.
      ++
      ++X chars := [char "a", char "A", char "X", char "8", char "+"]
      ++X [alphanumeric? c for c in chars]

  CODE ==> add

    Rep := SingleInteger  -- 0..255

    CC ==> CharacterClass()
    import CC

    OutChars:PrimitiveArray(OutputForm) :=
     construct [CODE_-CHAR(i)$Lisp for i in 0..255]

    minChar := minIndex OutChars

    a = b == a =$Rep b

    a < b == a <$Rep b

    size() == 256

    index n == char((n - 1)::Integer)

    lookup c == (1 + ord c)::PositiveInteger

    char(n:Integer) == n::%

    ord c == convert(c)$Rep

    random() == char(random()$Integer rem size())

    space == QENUM("   ", 0$Lisp)$Lisp

    quote == QENUM("_" ", 0$Lisp)$Lisp

    escape == QENUM("__ ", 0$Lisp)$Lisp

    coerce(c:%):OutputForm == OutChars(minChar + ord c)

    digit? c == member?(c pretend Character, digit())

    hexDigit? c == member?(c pretend Character, hexDigit())

    upperCase? c == member?(c pretend Character, upperCase())

    lowerCase? c == member?(c pretend Character, lowerCase())

    alphabetic? c == member?(c pretend Character, alphabetic())

    alphanumeric? c == member?(c pretend Character, alphanumeric())

    latex c ==
      concat("\mbox{`", concat(new(1,c pretend Character)$String, "'}")_
         $String)$String

    char(s:String) ==
     (#s) = 1 => s(minIndex s) pretend %
     error "String is not a single character"

    upperCase c ==
      QENUM(PNAME(UPCASE(CODE_-CHAR(ord c)$Lisp)$Lisp)$Lisp,0$Lisp)$Lisp

    lowerCase c ==
      QENUM(PNAME(DOWNCASE(CODE_-CHAR(ord c)$Lisp)$Lisp)$Lisp,0$Lisp)$Lisp

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