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PhutilProseDiffTestCase.php
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Thu, Dec 12, 00:09

PhutilProseDiffTestCase.php
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<?php
final class PhutilProseDiffTestCase extends PhutilTestCase {
public function testProseDiffsDistance() {
$this->assertProseParts(
'',
'',
array(),
pht('Empty'));
$this->assertProseParts(
"xxx\nyyy",
"xxx\nzzz\nyyy",
array(
"= xxx\n",
"+ zzz\n",
'= yyy',
),
pht('Add Paragraph'));
$this->assertProseParts(
"xxx\nzzz\nyyy",
"xxx\nyyy",
array(
"= xxx\n",
"- zzz\n",
'= yyy',
),
pht('Remove Paragraph'));
// Without smoothing, the alogorithm identifies that "shark" and "cat"
// both contain the letter "a" and tries to express this as a very
// fine-grained edit which replaces "sh" with "c" and then "rk" with "t".
// This is technically correct, but it is much easier for human viewers to
// parse if we smooth this into a single removal and a single addition.
$this->assertProseParts(
'They say the shark has nine lives.',
'They say the cat has nine lives.',
array(
'= They say the ',
'- shark',
'+ cat',
'= has nine lives.',
),
pht('"Shark/cat" word edit smoothenss.'));
$this->assertProseParts(
'Rising quickly, she says',
'Rising quickly, she remarks:',
array(
'= Rising quickly, she ',
'- says',
'+ remarks:',
),
pht('"Says/remarks" word edit smoothenss.'));
$this->assertProseParts(
'See screenshots',
'Viewed video files',
array(
'- See screenshots',
'+ Viewed video files',
),
pht('Complete paragraph rewrite.'));
$this->assertProseParts(
'xaaax',
'xbbbx',
array(
'- xaaax',
'+ xbbbx',
),
pht('Whole word rewrite with common prefix and suffix.'));
$this->assertProseParts(
' aaa ',
' bbb ',
array(
'= ',
'- aaa',
'+ bbb',
'= ',
),
pht('Whole word rewrite with whitespace prefix and suffix.'));
$this->assertSummaryProseParts(
"a\nb\nc\nd\ne\nf\ng\nh\n",
"a\nb\nc\nd\nX\nf\ng\nh\n",
array(
'.',
"= d\n",
'- e',
'+ X',
"= \nf",
'.',
),
pht('Summary diff with middle change.'));
$this->assertSummaryProseParts(
"a\nb\nc\nd\ne\nf\ng\nh\n",
"X\nb\nc\nd\ne\nf\ng\nh\n",
array(
'- a',
'+ X',
"= \nb",
'.',
),
pht('Summary diff with head change.'));
$this->assertSummaryProseParts(
"a\nb\nc\nd\ne\nf\ng\nh\n",
"a\nb\nc\nd\ne\nf\ng\nX\n",
array(
'.',
"= g\n",
'- h',
'+ X',
"= \n",
),
pht('Summary diff with last change.'));
$this->assertProseParts(
'aaa aaa aaa aaa, bbb bbb bbb bbb.',
"aaa aaa aaa aaa, bbb bbb bbb bbb.\n\n- ccc ccc ccc",
array(
'= aaa aaa aaa aaa, bbb bbb bbb bbb.',
"+ \n\n- ccc ccc ccc",
),
pht('Diff with new trailing content.'));
}
private function assertProseParts($old, $new, array $expect_parts, $label) {
$engine = new PhutilProseDifferenceEngine();
$diff = $engine->getDiff($old, $new);
$parts = $diff->getParts();
$this->assertParts($expect_parts, $parts, $label);
}
private function assertSummaryProseParts(
$old,
$new,
array $expect_parts,
$label) {
$engine = new PhutilProseDifferenceEngine();
$diff = $engine->getDiff($old, $new);
$parts = $diff->getSummaryParts();
$this->assertParts($expect_parts, $parts, $label);
}
private function assertParts(
array $expect,
array $actual_parts,
$label) {
$actual = array();
foreach ($actual_parts as $actual_part) {
$type = $actual_part['type'];
$text = $actual_part['text'];
switch ($type) {
case '.':
$actual[] = $type;
break;
default:
$actual[] = "{$type} {$text}";
break;
}
}
$this->assertEqual($expect, $actual, $label);
}
}

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