XLISP :sescape

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# :sescape

Type: | - | keyword
Source: | - | xlread.c

## Syntax

:sescape

## Description

The ':sescape' keyword is an entry used in the *readtable* system variable that contains XLISP's data structures relating to the processing of characters from the user [or files] and read-macro expansions. The existance of the ':sescape' keyword means that the specified character is to be used as a single escape character. The system defines that the the backslash character '\' is the only defined ':sescape' character.

## Examples

    ;; define a function to look in a table
    ;; and print out any :SESCAPE character

    (defun look-at (table)
      (dotimes (ch 127)
        (prog ((entry (aref table ch)))
          (case entry
            (:SESCAPE (princ (int-char ch)))
            (t nil))))
      (terpri))

    (look-at *readtable*)    ; prints  \

Caution: If you experiment with *readtable*, it is useful to save the old value in a variable, so that you can restore the system state.

See the :sescape keyword in the XLISP 2.0 manual.

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Nyquist / XLISP 2.0 - Contents | Tutorials | Examples | Reference