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Truncate the content within alt attribute to first 250 characters.

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# 1  
Old 02-07-2009
Truncate the content within alt attribute to first 250 characters.
I have a xml file which contains image tag as follows:

<image><img src="wstc_0007_0007_0_img0001.jpg" width="351" height="450" alt="This is the cover page. Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain" type="photograph" orient="portrait"/></image>

Now, i want to write a script that will count whether the number of characters within alt attribute are greater than 250 and if it is; the data within alt attribute should be truncated to contain only first 250 characters.

It would be really nice if anybody could provide me the way to do so.
# 2  
Old 02-07-2009
You know, if it truncated it in the middle of an &#x2022; or somesuch the result could be invalid HTML.
# 3  
Old 02-07-2009

This truncates the alt attribute by item, rather than characters:

Code:
altcheck() #@ USAGE: altcheck [max]
{ #@ Truncate the alt attribute in $line to $max characters
  max=${1:-250}
  right=${line#*alt=\"}
  left=${line%"$right"}
  alt=${right%%\"*}
  right=${line#*"$alt"}
  while [ ${#alt} -gt $max ]
  do
    alt=${alt% &*}
  done
  line=$left$alt$right
}

while IFS= read -r line
do
  case $line in
    *"<img"*alt=*) altcheck ;;
  esac
  printf "%s\n" "$line"
done < "$FILE"

# 4  
Old 02-10-2009
Hi Johnson!

Thanks for your help! . But above script is not working. Please help!!!. Thanks.
# 5  
Old 02-10-2009
Hammer & Screwdriver Another way to look at this
I duplicated some of the text inside that alt area so I could show it trimmed down. And then trimmed it at 150.
Note that it does not necessarily break nicely, and does not address the quotation " character.
However, this logic appears to trim on that field.

Code:
> cat file164
<image><img src="wstc_0007_0007_0_img0001.jpg" width="351" height="450" alt="This is the cover page. Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain" type="photograph" orient="portrait"/></image>
<image><img src="wstc_0007_0007_0_img0001.jpg" width="351" height="450" alt="This is the cover page. Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain" type="photograph" orient="portrait"/></image>

> sed "s/alt/~alt/g" file164 | sed "s/type/~type/g" | awk -F"~" '{print $1,substr($2,1,150),$3}'
<image><img src="wstc_0007_0007_0_img0001.jpg" width="351" height="450"  alt="This is the cover page. Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain"  type="photograph" orient="portrait"/></image>
<image><img src="wstc_0007_0007_0_img0001.jpg" width="351" height="450"  alt="This is the cover page. Brazil &#x2022; Japan &#x2022; Korea &#x2022; Mexico &#x2022; Singapore &#x2022; Spain Brazil &#x2022; Japan &#x2022; Kor type="photograph" orient="portrait"/></image>

# 6  
Old 02-11-2009
Quote:
Originally Posted by parshant_bvcoe
But above script is not working.

What does "not working" mean? What does happen?

Where does the script fail?

Are there any error messages?
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