PHP read Netlist from txt file - php

Question

I have this file format of txt file generated from schematic software:
(
NETR5_2
R6,1
R5,2
)
(
NETR1_2
R4,2
R3,1
R3,2
R2,1
R2,2
R1,1
R1,2
)
I need to get this:
Array
(
[0] => Array
(
[0] => NETR5_2
[1] => R6,1
[2] => R5,2
)
[1] => Array
[0] => NETR1_2
[1] => R4,2
[2] => R3,1
[3] => R3,2
[4] => R2,1
[5] => R2,2
[6] => R1,1
[7] => R1,2
)
Here is code i try but i get all from input string:
$file = file('tangoLista.txt');
/* GET - num of lines */
$f = fopen('tangoLista.txt', 'rb');
$lines = 0;
while (!feof($f)) {
$lines += substr_count(fread($f, 8192), "\n");
}
fclose($f);
for ($i=0;$i<=$lines;$i++) {
/* RESISTORS - check */
if (strpos($file[$i-1], '(') !== false && strpos($file[$i], 'NETR') !== false) {
/* GET - id */
for($k=0;$k<=10;$k++) {
if (strpos($file[$i+$k], ')') !== false || empty($file[$i+$k])) {
} else {
$json .= $k.' => '.$file[$i+$k];
}
}
$resistors_netlist[] = array($json);
}
}
echo '<pre>';
print_r($resistors_netlist);
echo '</pre>';
I need to read between ( and ) and put into array values...i try using checking if line begins with ( and NETR and if yes put into array...but i don't know how to get number if items between ( and ) to get foreach loop to read values and put into array.
Where i im making mistake? Can code be shorter?

Answer 1

Try this approach:
<?php
$f = fopen('test.txt', 'rb');
$resistors_netlist = array();
$current_index = 0;
while (!feof($f)) {
$line = trim(fgets($f));
if (empty($line)) {
continue;
}
if (strpos($line, '(') !== false) {
$resistors_netlist[$current_index] = array();
continue;
}
if (strpos($line, ')') !== false) {
$current_index++;
continue;
}
array_push($resistors_netlist[$current_index], $line);
}
fclose($f);
print_r($resistors_netlist);
This gives me:
Array
(
[0] => Array
(
[0] => NETR5_2
[1] => R6,1
[2] => R5,2
)
[1] => Array
(
[0] => NETR1_2
[1] => R4,2
[2] => R3,1
[3] => R3,2
[4] => R2,1
[5] => R2,2
[6] => R1,1
[7] => R1,2
)
)
We start $current_index at 0. When we see a (, we create a new sub-array at $resistors_netlist[$current_index]. When we see a ), we increment $current_index by 1. For any other line, we just append it to the end of $resistors_netlist[$current_index].

Answer 2

Try this, using preg_match_all:
$text = '(
NETR5_2
R6,1
R5,2
)
(
NETR1_2
R4,2
R3,1
R3,2
R2,1
R2,2
R1,1
R1,2
)';
$chunks = explode(")(", preg_replace('/\)\W+\(/m', ')(', $text));
$result = array();
$pattern = '{([A-z0-9,]+)}';
foreach ($chunks as $row) {
preg_match_all($pattern, $row, $matches);
$result[] = $matches[1];
}
print_r($result);
3v4l.org demo
I'm not the king of regex, so you can find a better way.
The main problem are parenthesis: I don't know what are between closing and next open parenthesis ( )????( ), so first I replace every space, tab, cr or ln between, then I explode the string by )(.
I perform a foreach loop for every element of resulted array, matching every occurrence of A-z0-9, and add array of retrieved values to an empty array that, at end of foreach, will contain desired result.
Please note:
The main pattern is based on provided example: if the values contains other characters then A-z 0-9 , the regex fails.
Edit:
Replaced preliminar regex pattern with `/\)\W+\(/m`