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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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147
Task/Execute-a-Markov-algorithm/PHP/execute-a-markov-algorithm.php Normal file
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<?php
function markov($text, $ruleset) {
$lines = explode(PHP_EOL, $ruleset);
$rules = array();
foreach ($lines AS $line) {
$spc = "[\t ]+";
if (empty($line) OR preg_match('/^#/', $line)) {
continue;
} elseif (preg_match('/^(.+)' . $spc . '->' . $spc . '(\.?)(.*)$/', $line, $matches)) {
list($dummy, $pattern, $terminating, $replacement) = $matches;
$rules[] = array(
'pattern' => trim($pattern),
'terminating' => ($terminating === '.'),
'replacement' => trim($replacement),
);
}
}
do {
$found = false;
foreach ($rules AS $rule) {
if (strpos($text, $rule['pattern']) !== FALSE) {
$text = str_replace($rule['pattern'], $rule['replacement'], $text);
if ($rule['terminating']) {
return $text;
}
$found = true;
break;
}
}
} while($found);
return $text;
}
$conf = array(
1 => array(
'text' => 'I bought a B of As from T S.',
'rule' => '
# This rules file is extracted from Wikipedia:
# http://en.wikipedia.org/wiki/Markov_Algorithm
A -> apple
B -> bag
S -> shop
T -> the
the shop -> my brother
a never used -> .terminating rule
',
),
2 => array(
'text' => 'I bought a B of As from T S.',
'rule' => '
# Slightly modified from the rules on Wikipedia
A -> apple
B -> bag
S -> .shop
T -> the
the shop -> my brother
a never used -> .terminating rule
',
),
3 => array(
'text' => 'I bought a B of As W my Bgage from T S.',
'rule' => '
# BNF Syntax testing rules
A -> apple
WWWW -> with
Bgage -> ->.*
B -> bag
->.* -> money
W -> WW
S -> .shop
T -> the
the shop -> my brother
a never used -> .terminating rule
',
),
4 => array(
'text' => '_1111*11111_',
'rule' => '
### Unary Multiplication Engine, for testing Markov Algorithm implementations
### By Donal Fellows.
# Unary addition engine
_+1 -> _1+
1+1 -> 11+
# Pass for converting from the splitting of multiplication into ordinary
# addition
1! -> !1
,! -> !+
_! -> _
# Unary multiplication by duplicating left side, right side times
1*1 -> x,@y
1x -> xX
X, -> 1,1
X1 -> 1X
_x -> _X
,x -> ,X
y1 -> 1y
y_ -> _
# Next phase of applying
1@1 -> x,@y
1@_ -> @_
,@_ -> !_
++ -> +
# Termination cleanup for addition
_1 -> 1
1+_ -> 1
_+_ ->
',
),
5 => array(
'text' => '000000A000000',
'rule' => '
# Turing machine: three-state busy beaver
#
# state A, symbol 0 => write 1, move right, new state B
A0 -> 1B
# state A, symbol 1 => write 1, move left, new state C
0A1 -> C01
1A1 -> C11
# state B, symbol 0 => write 1, move left, new state A
0B0 -> A01
1B0 -> A11
# state B, symbol 1 => write 1, move right, new state B
B1 -> 1B
# state C, symbol 0 => write 1, move left, new state B
0C0 -> B01
1C0 -> B11
# state C, symbol 1 => write 1, move left, halt
0C1 -> H01
1C1 -> H11
',
),
6 => array(
'text' => '101',
'rule' => '
# Another example extracted from Wikipedia:
# http://en.wikipedia.org/wiki/Markov_Algorithm
1 -> 0|
|0 -> 0||
0 ->
',
),
);
foreach ($conf AS $id => $rule) {
echo 'Ruleset ', $id, ' : ', markov($rule['text'], $rule['rule']), PHP_EOL;
}