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Annotation of researchv10dc/cmd/icon/ipl/source/escape.icn, revision 1.1

1.1     ! root        1: #      ESCAPE
        !             2: #
        !             3: #      Interpret Icon literal escapes
        !             4: #
        !             5: #      William H. Mitchell
        !             6: #
        !             7: #      Last mofied 2/1/86
        !             8: #
        !             9: 
        !            10: procedure escape(s)
        !            11:    ns := ""
        !            12:    s ? while c := move(1) do {
        !            13:       ns ||:= if c == "\\" then case c2 := (move(1) | "") of {
        !            14:       "b":  "\b"
        !            15:       "d":  "\d"
        !            16:       "e":  "\e"
        !            17:       "f":  "\f"
        !            18:       "l":  "\n"
        !            19:       "n":  "\n"
        !            20:       "r":  "\r"
        !            21:       "t":  "\t"
        !            22:       "v":  "\v"
        !            23:       "'":  "'"
        !            24:       "\"":  "\""
        !            25:       "x":  hexcode()
        !            26:       "^":  ctrlcode(move(1))
        !            27:       any('01234567',c2) & c2:  octcode(c2)
        !            28:       default:  c2
        !            29:       } else c
        !            30:       }
        !            31:    return ns
        !            32: end
        !            33: 
        !            34: procedure hexcode()
        !            35:    static cdigs
        !            36:    initial cdigs := ~'0123456789ABCDEFabcdef'
        !            37:    
        !            38:    move(i := 2 | 1) ? s := tab(upto(cdigs) | 0)
        !            39:    move(*s - i)
        !            40:    return &cset[integer("16r" || s) + 1]
        !            41: end
        !            42: 
        !            43: procedure octcode(c)
        !            44:    static cdigs
        !            45:    initial cdigs := ~'01234567'
        !            46:    
        !            47:    move(-1)
        !            48:    move(i := 3 | 2 | 1) ? s := tab(upto(cdigs) | 0)
        !            49:    move(*s - i)
        !            50:    return &cset[integer("8r" || s) + 1]
        !            51: end
        !            52: 
        !            53: procedure ctrlcode(s)
        !            54:    return &cset[find(map(s),&lcase) + 1]
        !            55: end
        !            56: 

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