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setter and getter functions for file manipulation with sed

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# 1  
Old 02-28-2012
setter and getter functions for file manipulation with sed
Hi,

I would really appreciate some help, I couldn't nail my problem:
I would like to create some setter and getter functions to make my life easier.

my sample file contains:
keyword - some tabs - value - semicolon
number 12.1;
float .3;
double 12;
real 12.2324;
stuff .234;
decimal 15.;
fruit apple;
veg carrot;
vegetable tomato;
my functions:
Code:
setNumber()
{
    sed -i '/^'$1'/s/[0-9][0-9]*\.*[0-9]*/'$2'/g' file
}

getNumber()
{
...
}

setParam()
{
...
}

getParam()
{
...
}

The setNumber works with all the different number forms, except the one which starts with a decimal point. Unfortunately, I'm not an expert in text manipulation.

The getters need to return the key value.

Maybe the two setter and getter functions can be merged, but I'm curious how to accomplish the get/set number as well.

Desired functionality:
setNumber number 1.1
setNumber float 1.2
setNumber double 1.3
setNumber real 1.4
setNumber stuff 1.5
setNumber decimal 1.6
setParam veg pumpkin
setParam vegetable pepper
setParam fruit cherry
number 1.1;
float 1.2;
double 1.3;
real 1.4;
stuff 1.5;
decimal 1.6;
fruit cherry;
veg pumpkin ;
vegetable pepper;
Thanks!
# 2  
Old 02-28-2012
Why not show us what you want to do, not the way you want to do it? There's got to be a better way. sed is not a function, sed is an external utility which can process thousands of lines at once. Running it once per value is like making 10,000 phone calls to say 10,000 words. Depending on these functions is going to make any scripts made from them extremely slow.

What I'd do is I'd load the data into memory, so you don't have to keep running sed over and over. How to do this, again, depends on what you're trying to do...

---------- Post updated at 01:45 PM ---------- Previous update was at 01:39 PM ----------

Also, what shell are you using?
# 3  
Old 02-28-2012
Hi there,
I got your point, but I don't think I made a mistake. I provided a small text file that resembles my actual real world case. I listed some numbers that may occur and can cause some trouble. And that's all. If the file that I tried to change is huge I would stressed that in the first place.

So to get it straight:
my real file is an OpenFOAM controlDict file like - cant post URL, forum engine wont allow, sorry
I just wanted to make some manipulation on it in an elegant way, without to much code duplication and overhead.
My shell is bash.

Thank you for your time!

unihub.ru/tools/ofservice/browser/trunk/2.0.1/OpenFOAM-2.0.1/tutorials/incompressible/simpleFoam/motorBike/system/controlDict

use https://, it is working here
Last edited by Toorop; 02-28-2012 at 04:22 PM.. Reason: url addition
# 4  
Old 02-28-2012
post it without the http in front, then. What it actually looks like makes the difference between whether any of our answers will work or fail. What little I've managed to google up suggests that it does in fact have internal structure you haven't shown, structure which would be destroyed by any of the methods I've tried so far.

If your goal is to avoid overhead, functions running individual instances of sed to do each little thing are exactly what you want to avoid. You want to read the file once, change what you want to change, and write the result out.

---------- Post updated at 02:17 PM ---------- Previous update was at 02:08 PM ----------

Quote:
Originally Posted by Toorop
unihub.ru/tools/ofservice/browser/trunk/2.0.1/OpenFOAM-2.0.1/tutorials/incompressible/simpleFoam/motorBike/system/controlDict
403 forbidden...I think.

---------- Post updated at 02:24 PM ---------- Previous update was at 02:17 PM ----------

Got it. Nowhere near as easy as what you asked for. Working on it.
# 5  
Old 02-28-2012
First of all, thanks a lot.

Hopefully, there's no misunderstanding between us, since I still don't know why the original task is much easier.

'setParam application newSolver' should change the line which starts with "application" and change the value to "newSolver"
application simpleFOAM; ---> application newSolver;

IMHO, its the same problem as 'setParam fruit cherry' in the initial task!
# 6  
Old 02-28-2012
Quote:
Originally Posted by Toorop
First of all, thanks a lot.

Hopefully, there's no misunderstanding between us, since I still don't know why the original task is much easier.
// No comments.

No /* multi-line comments. */

No { code blocks. }

No "strings".

Your code only might work under very particular circumstances, can't tell code blocks apart from each other, and may edit the heck out of the comments by accident.

I can give you something to do a specific task easily. You wanted something general, and that's hard.

This is why I asked what you actually wanted to do, not what manner you wanted to accomplish it in. Replacing values is easy enough. Giving you 'getters' and 'setters' so you can replace in exactly the manner you think you should isn't.

---------- Post updated at 03:39 PM ---------- Previous update was at 02:59 PM ----------

I still can't handle multi-line comments, so you'd better hope the variable names never show up in comments. But:

Code:
#!/bin/bash
cp data data-backup

awk 'function get(N)
{
        split(LINE[VAR[N]], A);
        sub(/;$/, "", A[2]);
        return(A[2]);
}

function set(N,V)
{
        if(!VAR[N])
        {
                LINE[++C]=N "\t" V ";"
                VAR[N]=C;
        }
        else
        {
                $0=LINE[VAR[N]];
                $2=V ";"
                LINE[VAR[N]]=$0
        }
}

/{/ && LL       {       PP[++L]=VP;     VP=VP LL "."    }
/}/             {       VP=PP[L--];                     }

{       LL=$0;  NAME=""; VALUE="";      LINE[++C]=$0     }

(NF==2) && /;$/ {       VAR[VP $1]=NR   }

END {
        set("FoamFile.version", "3.0");
        set("newvalue", "slartibartfast");
        for(N=1; N<=C; N++)    print LINE[N];
}' data-backup > data

Edit the part in red to your heart's content.
Last edited by Corona688; 02-28-2012 at 05:11 PM..
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