operator
true if the system path named by string-expression exists and is readable, false
otherwise.file string-expression (is | isnt) readable
The file ... is readable test is used to determine if the system path named by
string-expression exists and is readable by the OmniMark program. This is useful to avoid a
program error when reading a file. Using isnt instead of is will
reverse the results.
The following program shows how file ... is readable is used to avoid attempting to read a file that
cannot be be read:
find "\input{" [any \ "}"]+ => filename "}" do unless file filename is readable put #log "ERROR: File " || filename || " does not exist ... skipping.%n" else submit file filename done