Translating a sed one-liner into awk - bash

Question

I am parsing files containing lines of "key=value" pairs. An example could be this:
Normal line
Another normal line
[PREFIX] 1=Something 5=SomethingElse 26=42
Normal line again
I'd like to leave all lines not containing key=value pairs as they are, while transforming all lines containing key=value pairs as follows:
Normal line
Another normal line
[PREFIX]
AAA=Something
EEE=SomethingElse
ZZZ=42
Normal line again
Assume I have a valid dictionary for the translation.
What I do at the moment is passing the input to sed, where I turn spaces into newlines for the lines that match '^\['.
The output is then piped into this awk script:
BEGIN {
dict[1] = "AAA"
dict[5] = "EEE"
dict[26] = "ZZZ"
FS="="
}
{
if (match($0, "[0-9]+=.+")) {
key = ""
if ($1 in dict) {
key = dict[$1]
}
printf("%7s = %s\n", key, $2)
}
else {
print
next
}
}
The overall command line then becomes:
cat input | sed '/^\(\[.*\)/s/ /\n/g' | awk -f script.awk
My question is: is there any way I can include the sed operation in the middle so to get rid of that additional step?

Answer 1

$ cat tst.awk
BEGIN {
split("1 AAA 5 EEE 26 ZZZ",tmp)
for (i=1; i in tmp; i+=2) {
dict[tmp[i]] = tmp[i+1]
}
FS="[ =]"
OFS="="
}
$1 == "[PREFIX]" {
print $1
for (i=2; i<NF; i+=2) {
print " " ($i in dict ? dict[$i] : $i), $(i+1)
}
next
}
{ print }
$ awk -f tst.awk file
Normal line
Another normal line
[PREFIX]
AAA=Something
EEE=SomethingElse
ZZZ=42
Normal line again

Answer 2

In fact I could not force awk to read the file twice; one for sed command, one for your algo, so I had to modify your algo.
BEGIN {
dict[1] = "AAA"
dict[5] = "EEE"
dict[26] = "ZZZ"
# FS="="
}
$0 !~/[0-9]+=.+/ { print }
/[0-9]+=.+/ {
nb = split($0,arr1);
for (i=1; i<=nb; i++ in arr1) {
nbb = split(arr1[i], keyVal, "=");
if ( (nbb==2) && (keyVal[1] in dict) ) {
printf("%7s = %s\n", dict[keyVal[1]], keyVal[2])
}
else
print arr1[i];
}
}

Answer 3

When you have to convert a lot, you can first migrate your dict file into a sed script file. When your dicht file has a fixed format, you can convert it on the fly.
Suppose your dict file looks like
1=AAA
5=EEE
26=ZZZ
And your input file is
Normal line
Another normal line
[PREFIX] 1=Something 5=SomethingElse 26=42
Normal line again
You want to do something like
cat input | sed '/^\[/ s/ /\n/g' | sed 's/^1=/ AAA=/'
# Or eliminating the extra step with cat
sed '/^\[/ s/ /\n/g' input | sed 's/^1=/ AAA=/'
So your next step is converting your dict file into sed commands:
sed 's#\([^=]*\)=\(.*\)#s/^\1=/ \2=/#' dictfile
Now you can combine these with
sed '/^\[/ s/ /\n/g' input | sed -f <(
sed 's#\([^=]*\)=\(.*\)#s/^\1=/ \2=/#' dictfile
)