Naive coding... Post: 302992180

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The Lounge What is on Your Mind? Naive coding... Post 302992180 by Corona688 on Wednesday 22nd of February 2017 10:58:54 AM

02-22-2017

Registered User

Quote:

Originally Posted by wisecracker

I have this insane distrust of compilers and interpreters.
So I do what could be called naive coding in most langauages that I know well enough because of this distrust.

This is one example of my naive code and IS actually inside AudioScope.sh.

Code:

read -r -p "Set timebase starting point. From 0 to $scan_end<CR> " -e tbinput
# Ensure the timebase values are set to default before changing.
scan_start=0
scan_jump=1
# Eliminate any keyboard error longhand...
# Ensure a NULL string does NOT exist.
if [ "$tbinput" == "" ]
then
	scan_start=0
	tbinput=0
fi
# Find the length of the inputted string and correct for subscript position.
str_len=$(( ${#tbinput} - 1 ))
# Now check for continuous numerical characters ONLY.
for count in $( seq 0 $str_len )
do
	# Reuse variable _number_ to obtain each character per loop.
	number=${tbinput:$count:1}
	# Now convert the character to a decimal number.
	number=$( printf "%d" \'$number )
	# IF ANY ASCII character exists that is not numerical then reset the scan start point.
	if [ $number -le 47 ]
	then
		scan_start=0
		tbinput=0
	fi
	if [ $number -ge 58 ]
	then
		scan_start=0
		tbinput=0
	fi
done

Derivatives of this have never failed under normal conditions on the langauges I have used so it seems idiot proof.
Would professionals like yourselvs consider this puerile coding?

That's just about the most difficult way possible to solve the problem. I only resort to it when the language features just can't handle it (i.e. needing to build a recursive parser from scratch).

When you find yourself doing this for trivial things, you're definitely overthinking it. Try inverting the problem. What if you looked for exactly one non-numeric character? You only need to find one to prove the string's bad, and if you can't... fait accompli.

One way:

Code:

case "$STR" in 
) echo "Blank" ;;
*[^0-9]*)  echo "Contains non-numeric" ;;
*) echo "Valid" ;;
esac

This is portable across all bourne shells. In BASH, you could reduce it to a single statement.

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LEARN ABOUT DEBIAN

shtool-echo

SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME

       shtool-echo - GNU shtool echo(1) extensional command

SYNOPSIS

       shtool echo [-n|--newline] [-e|--expand] string

DESCRIPTION

       shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold
       mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the
       gory details needed to find out the environment details under option -e.

OPTIONS

       The following command line options are available.

       -n, --newline
	   By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is
	   omitted.

       -e, --expand
	   If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the
	   following constructs are recognized:

	   %B  switch terminal mode to bold display mode.

	   %b  switch terminal mode back to normal display mode.

	   %u  the current user name.

	   %U  the current user id (numerical).

	   %g  the current group name.

	   %G  the current group id (numerical).

	   %h  the current hostname (without any domain extension).

	   %d  the current domain name.

	   %D  the current day of the month.

	   %M  the current month (numerical).

	   %m  the current month name.

	   %Y  the current year.

EXAMPLE

	#   shell script
	shtool echo -n -e "Enter your name [%B%u%b]: "; read name
	shtool echo -e "Your Email address might be %u@%h%d"
	shtool echo -e "The current date is %D-%m-%Y"

HISTORY

       The GNU shtool echo command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML)
       under the name buildinfo. It was later taken over into GNU shtool.

SEE ALSO

       shtool(1), echo(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-ECHO.TMP(1)

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