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<?php
class it_pipe implements Iterator
{
/**
* Creates a pipe object from input. Named arguments:
* $p['fn'] filename to read lines from
* $p['cmd'] cmd to read lines from
* $p['data'] data to read line from. either array of lines without newslines or string
*/
function __construct($p = array())
{
if ($p['data'])
$this->lines = $p['data'];
else
$this->lines = isset($p['fn']) ? file($p['fn'], FILE_IGNORE_NEW_LINES) : explode("\n", rtrim(it::exec($p['cmd'], $p['args'])));
}
/**
* Apply an expression to every line
*/
function map($expr)
{
$this->lines = it::map($expr, $this->lines);
return $this;
}
/**
* Convert pipe from utf8 to iso-latin
*/
function latin()
{
return $this->map('utf8_decode($v)');
}
/**
* Convert pipe from iso-latin to uft8
*/
function utf8()
{
return $this->map('utf8_encode($v)');
}
/**
* Return contents of pipe as key->val pair (key must be tab separated)
*/
function keyval()
{
foreach ($this->lines as $line)
{
list($key, $val) = explode("\t", $line, 2);
$result[$key] = $val;
}
return $result;
}
/**
* Swap first two columns
*/
function swap()
{
foreach ($this->lines as $idx => $line)
{
list($col1, $col2) = explode("\t", $line, 2);
$this->lines[$idx] = "$col2\t$col1";
}
return $this;
}
function ED()
{
ED($this->lines);
return $this;
}
function cols($collist)
{
$keys = explode(",", $collist);
foreach ($this->lines as $idx => $line)
$this->lines[$idx] = (object)array_combine($keys, explode("\t", $line));
return $this;
}
/**
* Return contents of pipe as associative records
*/
function csv()
{
$schema = explode("\t", it::replace(array('"' => ''), trim(array_shift($this->lines), "#\n")));
$oldlocale = setlocale(LC_CTYPE, 'de_CH.iso-8859-1');
foreach ($this->lines as $line)
$records[] = (object)array_combine($schema, str_getcsv($line, "\t", '"')); # could do a function_exists('str_getcsv') here...
setlocale(LC_CTYPE, $oldlocale);
return $records;
}
function pipe($cmd)
{
$descriptors = array(0 => array("pipe", "r"), 1 => array("pipe", "w"));
$process = proc_open($cmd, $descriptors, $pipes);
fwrite($pipes[0], join("\n", $this->lines) . ($this->lines ? "\n" :""));
fclose($pipes[0]);
$this->lines = explode("\n", rtrim(stream_get_contents($pipes[1])));
$this->key = 0;
fclose($pipes[1]);
proc_close($process);
return $this;
}
#
# Magic functions
#
function __call($name, $params)
{
array_unshift($params, "");
$func = ($t = it::match('(\w+)__(\w+)', $name)) ? array($t[0], $t[1]) : (method_exists($this, $name) ? array($this, $name) : $name);
foreach($this->lines as $i => $params[0])
$this->lines[$i] = call_user_func_array($func, $params);
return $this;
}
function __toString()
{
return is_array($this->lines) ? join("\n", $this->lines) . "\n" : "";
}
#
# Internal: Implement iterator
#
function rewind()
{
reset($this->lines);
$this->next();
}
function next()
{
$this->valid = each($this->lines);
}
function valid()
{
return $this->valid;
}
function current()
{
return $this->valid[1];
}
function key()
{
return $this->valid[0];
}
}
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