OpenEuphoria

Re: help!

• Posted by jiri babor <jbabor at PARADISE.NET.NZ> Sep 20, 1998
• 606 views

Matt just wrote:

>I found out there are no functions for trimming white space(like LTRIM$
>and RTRIM$ in BASIC), so i tried to make one. then i found out there are
>no functions that can scan variables(like MID$ in BASIC). So, i found a
>bbbbbbbiiiiiiiggggggggg disadvantage in Euphoria.


You have to have a pretty big mouth to shout such big words...

The really big advantage of Euphoria is you can roll your own function
of this kind quite easily, and they are invariably zillion times
faster than equivalents in your beloved, crummy BASIC:

function ltrim(sequence s)
    -- 'short-circuit' optimized left trim
    integer c,i,len
    len=length(s)
    i=1
    while i<=len do
        c=s[i]
        if c=32 then i=i+1
        elsif c=10 then i=i+1
        elsif c=13 then i=i+1
        elsif c=9 then i=i+1
        else exit end if
    end while
    return s[i..len]
end function

function rtrim(sequence s)
    -- 'short-circuit' optimized right trim
    integer c,i
    i=length(s)
    while i do
        c=s[i]
        if c=32 then i=i-1
        elsif c=10 then i=i-1
        elsif c=13 then i=i-1
        elsif c=9 then i=i-1
        else exit end if
    end while
    return s[1..i]
end function

function trim(sequence s)
    -- trim 'white space' from both ends of string s
    -- 'short-circuit' optimized
    integer c,i,j,len
    len=length(s)
    i=1
    while i<=len do
        c=s[i]
        if c=32 then i=i+1
        elsif c=10 then i=i+1
        elsif c=13 then i=i+1
        elsif c=9 then i=i+1
        else exit end if
    end while
    j=len
    while j>=i do
        c=s[j]
        if c=32 then j=j-1
        elsif c=10 then j=j-1
        elsif c=13 then j=j-1
        elsif c=9 then j=j-1
        else exit end if
    end while
    return s[i..j]
end function

Enjoy. jiri