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libphutil/src/utils/__tests__/PhutilEditDistanceMatrixTestCase.php
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PhutilEditDistanceMatrixTestCase.php
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<?php
final class PhutilEditDistanceMatrixTestCase extends PhutilTestCase {
public function testEditDistance() {
// Empty inputs.
$this->assertDistance(0, '', '');
$this->assertDistance(27, '', 'xxx', 9);
$this->assertDistance(27, 'xxx', '', 1, 9);
// Both inputs identical.
$this->assertDistance(0, 'x', 'x');
$this->assertDistance(0, 'xyzabc', 'xyzabc');
// Simple edits.
$this->assertDistance(1, 'cat', 'car');
$this->assertDistance(1, 'cat', 'cut');
$this->assertDistance(1, 'cat', 'bat');
$this->assertDistance(2, 'cat', 'bar');
$this->assertDistance(3, 'cat', 'dog');
// Inserts.
$this->assertDistance(1, 'cat', 'cats');
$this->assertDistance(1, 'cat', 'cast');
$this->assertDistance(1, 'cat', 'xcat');
$this->assertDistance(1, 'cat', 'cxat');
// Deletes.
$this->assertDistance(1, 'cat', 'ca');
$this->assertDistance(1, 'cat', 'ct');
$this->assertDistance(1, 'cat', 'at');
// Replacements.
$this->assertDistance(1, 'xxxxx', 'xxxxy');
$this->assertDistance(1, 'xxxxx', 'xxyxx');
$this->assertDistance(1, 'yxxxx', 'xxxxx');
// Costs.
$this->assertDistance(27, 'x', 'xxxx', 9);
$this->assertDistance(27, 'xxxx', 'x', 1, 9);
$this->assertDistance(27, 'xxxxx', 'xyyyx', 5, 5, 9);
// Misc.
$this->assertDistance(
13,
'The quick brown fox jumped over the lazy dog!',
// dddddd r ii i iii
'The brown fox pumped over those lazy dogs!~~~');
}
public function testDamerauEditDistance() {
// Simple adjacent transpositions.
$this->assertDistance(1, 'abcd', 'abdc', 3, 3, 3, 1);
$this->assertDistance(1, 'abcd', 'bacd', 3, 3, 3, 1);
$this->assertDistance(2, 'abcd', 'badc', 3, 3, 3, 1);
// Transpositions with other edits.
$this->assertDistance(7, 'abcd', 'baaa', 3, 3, 3, 1);
$this->assertDistance(7, 'abcd', 'babb', 3, 3, 3, 1);
// Sequences of adjacent transpositions.
$this->assertDistance(3, 'abcd', 'cbad', 3, 3, 3, 1);
$this->assertDistance(5, 'abcd', 'dbca', 3, 3, 3, 1);
// Misc.
$this->assertDistance(
11,
'Cozy lummox gives smart squid who asks for job pen.',
// t d r i i i ttt ii
'Cozy lummxo give smarp squid, whom tasks for boj a pen.');
}
public function testEditString() {
$this->assertEditString('', '', '');
$this->assertEditString('iii', '', 'aaa');
$this->assertEditString('ddd', 'aaa', '');
$this->assertEditString('sss', 'aaa', 'aaa');
$this->assertEditString(
'xssisssisx',
'Qz(ab)zQ',
'Rz((ab))zR',
1, 1, 1, null, 0.001);
$this->assertEditString('xxs', 'cat', 'rot');
$this->assertEditString(
'xxsssxxsssixsxxxsssdssssssssxssxsixsissssddddsdxxsssss',
'Cozy lummox gives smart squid who asks for job pen.',
'Lazy hammock takes mart squad that basks in pen.');
}
public function testDamerauEditString() {
$this->assertEditString('xxss', 'land', 'alnd');
$this->assertEditString('ttss', 'land', 'alnd', 1, 1, 1, 1);
$this->assertEditString('tsts', 'land', 'nald', 3, 3, 3, 1);
}
public function testEditMatrixMaximumLength() {
// These tests are hitting the maximum length limit; the expected costs
// and strings are degenerate.
$matrix = id(new PhutilEditDistanceMatrix())
->setInsertCost(3)
->setDeleteCost(7)
->setMaximumLength(1)
->setSequences(array('X', 'a', 'a', 'Y'), array('Q', 'a', 'a', 'R'));
$this->assertEqual(
40,
$matrix->getEditDistance());
$this->assertEqual(
'ddddiiii',
$matrix->getEditString());
$matrix = id(new PhutilEditDistanceMatrix())
->setInsertCost(3)
->setDeleteCost(7)
->setMaximumLength(1)
->setSequences(
array('f', 'f', 'X', 'a', 'a', 'Y', 'g', 'g'),
array('f', 'f', 'Q', 'a', 'a', 'R', 'g', 'g'));
$this->assertEqual(
40,
$matrix->getEditDistance());
$this->assertEqual(
'ssddddiiiiss',
$matrix->getEditString());
}
private function assertDistance(
$expect,
$x, $y,
$ins = 1, $del = 1,
$rep = 1, $trn = null,
$alt = 0) {
$matrix = $this->buildMatrix($x, $y, $ins, $del, $rep, $trn, $alt);
$cost = $matrix->getEditDistance();
$desc = array($ins, $del, $rep, ($trn === null ? '-' : $trn));
$desc = implode(', ', $desc);
$this->assertEqual(
$expect,
$cost,
"Edit distance of '{$x}' -> '{$y}' with costs ({$desc}).");
}
private function assertEditString(
$expect,
$x, $y,
$ins = 1, $del = 1,
$rep = 1, $trn = null,
$alt = 0) {
$matrix = $this->buildMatrix($x, $y, $ins, $del, $rep, $trn, $alt);
$matrix->setComputeString(true);
$string = $matrix->getEditString();
$desc = array($ins, $del, $rep);
$desc[] = ($trn === null ? '-' : $trn);
$desc[] = ($alt === 0 ? '-' : $alt);
$desc = implode(', ', $desc);
$this->assertEqual(
$expect,
$string,
"Edit string of '{$x}' -> '{$y}' with costs ({$desc}).");
}
private function buildMatrix($x, $y, $ins, $del, $rep, $trn, $alt) {
if (!strlen($x)) {
$xv = array();
} else {
$xv = str_split($x);
}
if (!strlen($y)) {
$yv = array();
} else {
$yv = str_split($y);
}
return id(new PhutilEditDistanceMatrix())
->setSequences($xv, $yv)
->setInsertCost($ins)
->setDeleteCost($del)
->setReplaceCost($rep)
->setTransposeCost($trn)
->setAlterCost($alt);
}
}
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