[REBOL] Re: Help required for a little parsing problem

[Christian Ensel]

Hallo Nigel,

Andrew's version is even shorter than mine, doing it by just
'change -ing instead of 'remove -ing and 'insert -ing.

Nevertheless, here's my version with additinal comments:

parse post [
    any                        ; apply the following rule 0 or more times
    [
        to "[url]"             ; jumps to the first occurence of "[url]"
                               ; we're right ahead of it now

        tag:                   ; remember the position in the string
        
        5 skip                 ; skip 5 characters ("[url]")
        
        copy url to "[/url]"   ; copy everthing till we encounter a
                               ; string "[/url]"
                               ; 'url now holds the url, but not the brackets
                               
                               ; all the above is the 'parse dialect
        
        (                      ; start of code (non-dialect) section

            remove/part tag add length? url 11
            
                               ; remove length? url plus additional 11
                               ; chars ("[url]" = 5 + "[/url]" = 6)
                               ; from the input string,
                               ; counting from the position we told
                               ; 'parse to remember in 'tag
                                
            insert tag rejoin [
                {<a href="} url {" target="_blank">} url {</a>}
            ]
                               ; composes the html-tag and inserts
                               ; it at the position 'tag
                               
                               ; voila!
        
        )                      ; end of code section
    ]
    to end
]

If you want to learn about 'parse see the new user guide on rebol.com,
chapter 14. Have fun!
 

   Christian
   [EMAIL PROTECTED]

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