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module escaper
character(*), parameter::need_escape = " $&`:<>[]{}+#%@/;=?\^|~',"//'"'
contains
subroutine escape_string(text)
implicit none
character(*), intent(inout)::text
integer::i
character(3)::replace_text
integer::replace_code
i=1
do while(i < len_trim(text))
if(index(need_escape, text(i:i)) > 0) then
replace_code = iachar(text(i:i))
write(replace_text, '(A1,Z2)') "%", replace_code
if(i == 1) then
text = replace_text//text(2:len_trim(text))
else if(i == len_trim(text)) then
text = text(1:(i-1))//replace_text
else
text = text(1:(i-1))//replace_text//text((i+1):len_trim(text))
end if
i = i + 3
else
i = i + 1
end if
end do
end subroutine escape_string
end module escaper
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