substitue( optimize

Hi,


After reading a file and getting 1 million lines' List, I need to make similar substitutions over matched lines ~500 times with this func:


fun! foo#set_new_val(ressource) abort "{{{

" position
let pos = foo#getpos_ress(a:ressource)
let pres = foo#geth_presence(a:ressource)
let s:xml[pos] = substitute(s:xml[pos],'false\|true',pres,"") <<< HERE

" Slave/Voie01 to Voie08
for idx in [1,2,3,4,5,6,7,8] <<< HERE
let pos = foo#getpos_ress(a:ressource.'/bar0'.string(idx))
let s:xml[pos] = substitute(s:xml[pos],'false\|true',pres,"") <<< HERE
endfor

endfu"}}}


1/ Can I optimize this function ?
2/ Maybe mapping this line code in register : substitute(s:xml[pos],'false\|true',pres,"") ?

Thank you


Nota : General Concept

0. Dicts
0.1 Reading file to List (1 million lines)
0.2 Dict with new values to set onto matched lines
0.3 Memory DictPos of List's lines numbers (0.1) matching needed lines.

1. Process List into for loop of 500
1.1 Do matchstrpos to get line's position to update in List (foo#getpos_ress)
1.2 Make substitution as describe above.

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