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Provide better parsing primitives for hunks

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Summary:
Ref T1266. This prepares to fix case (2) on T1266 by improving the robustness of hunk parsing.

In particular, the copy detection code abuses this API because it isn't currently expressive or flexible enough.

Make it more flexible and cover it exhaustively.

I'll move callsites to the new stuff in upcoming revisions.

Test Plan: Unit tests.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T1266

Differential Revision: https://secure.phabricator.com/D12144
This commit is contained in:
epriestley 2015-03-24 13:11:37 -07:00
parent dcaafd6159
commit 74a4c2cf0b
8 changed files with 478 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

113
src/applications/differential/storage/DifferentialHunk.php
View file

@ -10,6 +10,8 @@ abstract class DifferentialHunk extends DifferentialDAO
protected $newLen;
private $changeset;
private $structuredLines;
private $structuredFiles = array();
const FLAG_LINES_ADDED = 1;
const FLAG_LINES_REMOVED = 2;
@ -35,6 +37,102 @@ abstract class DifferentialHunk extends DifferentialDAO
return implode('', $this->makeContent($include = '-+'));
}
public function getStructuredOldFile() {
return $this->getStructuredFile('-');
}
public function getStructuredNewFile() {
return $this->getStructuredFile('+');
}
private function getStructuredFile($kind) {
if ($kind !== '+' && $kind !== '-') {
throw new Exception(
pht(
'Structured file kind should be "+" or "-", got "%s".',
$kind));
}
if (!isset($this->structuredFiles[$kind])) {
if ($kind == '+') {
$number = $this->newOffset;
} else {
$number = $this->oldOffset;
}
$lines = $this->getStructuredLines();
// NOTE: We keep the "\ No newline at end of file" line if it appears
// after a line which is not excluded. For example, if we're constructing
// the "+" side of the diff, we want to ignore this one since it's
// relevant only to the "-" side of the diff:
//
// - x
// \ No newline at end of file
// + x
//
// ...but we want to keep this one:
//
// - x
// + x
// \ No newline at end of file
$file = array();
$keep = true;
foreach ($lines as $line) {
switch ($line['type']) {
case ' ':
case $kind:
$file[$number++] = $line;
$keep = true;
break;
case '\\':
if ($keep) {
// Strip the actual newline off the line's text.
$text = $file[$number - 1]['text'];
$text = rtrim($text, "\r\n");
$file[$number - 1]['text'] = $text;
$file[$number++] = $line;
$keep = false;
}
break;
default:
$keep = false;
break;
}
}
$this->structuredFiles[$kind] = $file;
}
return $this->structuredFiles[$kind];
}
private function getStructuredLines() {
if ($this->structuredLines === null) {
$lines = phutil_split_lines($this->getChanges());
$structured = array();
foreach ($lines as $line) {
if (empty($line[0])) {
// TODO: Can we just get rid of this?
continue;
}
$structured[] = array(
'type' => $line[0],
'text' => substr($line, 1),
);
}
$this->structuredLines = $structured;
}
return $this->structuredLines;
}
public function getContentWithMask($mask) {
$include = array();
@ -59,21 +157,6 @@ abstract class DifferentialHunk extends DifferentialDAO
$results = array();
$lines = explode("\n", $this->getChanges());
// NOTE: To determine whether the recomposed file should have a trailing
// newline, we look for a "\ No newline at end of file" line which appears
// after a line which we don't exclude. For example, if we're constructing
// the "new" side of a diff (excluding "-"), we want to ignore this one:
//
// - x
// \ No newline at end of file
// + x
//
// ...since it's talking about the "old" side of the diff, but interpret
// this as meaning we should omit the newline:
//
// - x
// + x
// \ No newline at end of file
$n = (strpos($include, '+') !== false ?
$this->newOffset :

316
src/applications/differential/storage/__tests__/DifferentialHunkTestCase.php
View file

@ -34,4 +34,320 @@ final class DifferentialHunkTestCase extends ArcanistPhutilTestCase {
}
public function testMakeStructuredChanges1() {
$hunk = $this->loadHunk('fruit1.diff');
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "apple\n",
),
2 => array(
'type' => ' ',
'text' => "cherry\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "apple\n",
),
2 => array(
'type' => '+',
'text' => "banana\n",
),
3 => array(
'type' => '+',
'text' => "plum\n",
),
4 => array(
'type' => ' ',
'text' => "cherry\n",
),
),
$hunk->getStructuredNewFile());
}
public function testMakeStructuredChanges2() {
$hunk = $this->loadHunk('fruit2.diff');
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "apple\n",
),
2 => array(
'type' => ' ',
'text' => "banana\n",
),
3 => array(
'type' => '-',
'text' => "plum\n",
),
4 => array(
'type' => ' ',
'text' => "cherry\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "apple\n",
),
2 => array(
'type' => ' ',
'text' => "banana\n",
),
3 => array(
'type' => ' ',
'text' => "cherry\n",
),
),
$hunk->getStructuredNewFile());
}
public function testMakeStructuredNewlineAdded() {
$hunk = $this->loadHunk('trailing_newline_added.diff');
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "quack\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => '-',
'text' => 'quack',
),
4 => array(
'type' => '\\',
'text' => " No newline at end of file\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "quack\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => '+',
'text' => "quack\n",
),
),
$hunk->getStructuredNewFile());
}
public function testMakeStructuredNewlineRemoved() {
$hunk = $this->loadHunk('trailing_newline_removed.diff');
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "quack\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => '-',
'text' => "quack\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
1 => array(
'type' => ' ',
'text' => "quack\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => '+',
'text' => 'quack',
),
4 => array(
'type' => '\\',
'text' => " No newline at end of file\n",
),
),
$hunk->getStructuredNewFile());
}
public function testMakeStructuredNewlineAbsent() {
$hunk = $this->loadHunk('trailing_newline_absent.diff');
$this->assertEqual(
array(
1 => array(
'type' => '-',
'text' => "quack\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => ' ',
'text' => 'quack',
),
4 => array(
'type' => '\\',
'text' => " No newline at end of file\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
1 => array(
'type' => '+',
'text' => "meow\n",
),
2 => array(
'type' => ' ',
'text' => "quack\n",
),
3 => array(
'type' => ' ',
'text' => 'quack',
),
4 => array(
'type' => '\\',
'text' => " No newline at end of file\n",
),
),
$hunk->getStructuredNewFile());
}
public function testMakeStructuredOffset() {
$hunk = $this->loadHunk('offset.diff');
$this->assertEqual(
array(
76 => array(
'type' => ' ',
'text' => " \$bits .= '0';\n",
),
77 => array(
'type' => ' ',
'text' => " }\n",
),
78 => array(
'type' => ' ',
'text' => " }\n",
),
79 => array(
'type' => ' ',
'text' => " }\n",
),
80 => array(
'type' => '-',
'text' => " \$this->bits = \$bits;\n",
),
81 => array(
'type' => ' ',
'text' => " }\n",
),
82 => array(
'type' => ' ',
'text' => " return \$this->bits;\n",
),
),
$hunk->getStructuredOldFile());
$this->assertEqual(
array(
76 => array(
'type' => ' ',
'text' => " \$bits .= '0';\n",
),
77 => array(
'type' => ' ',
'text' => " }\n",
),
78 => array(
'type' => ' ',
'text' => " }\n",
),
79 => array(
'type' => '+',
'text' => " break;\n",
),
80 => array(
'type' => ' ',
'text' => " }\n",
),
81 => array(
'type' => '+',
'text' => " \$this->bits = \$bytes;\n",
),
82 => array(
'type' => ' ',
'text' => " }\n",
),
83 => array(
'type' => ' ',
'text' => " return \$this->bits;\n",
),
),
$hunk->getStructuredNewFile());
}
private function loadHunk($name) {
$root = dirname(__FILE__).'/hunk/';
$data = Filesystem::readFile($root.$name);
$parser = new ArcanistDiffParser();
$changes = $parser->parseDiff($data);
$viewer = PhabricatorUser::getOmnipotentUser();
$diff = DifferentialDiff::newFromRawChanges($viewer, $changes);
$changesets = $diff->getChangesets();
if (count($changesets) !== 1) {
throw new Exception(
pht(
'Expected exactly one changeset from "%s".',
$name));
}
$changeset = head($changesets);
$hunks = $changeset->getHunks();
if (count($hunks) !== 1) {
throw new Exception(
pht(
'Expected exactly one hunk from "%s".',
$name));
}
$hunk = head($hunks);
return $hunk;
}
}

9
src/applications/differential/storage/__tests__/hunk/fruit1.diff Normal file
View file

@ -0,0 +1,9 @@
diff --git a/fruit b/fruit
index 29b651e..ef05da5 100644
--- a/fruit
+++ b/fruit
@@ -1,2 +1,4 @@
apple
+banana
+plum
cherry

9
src/applications/differential/storage/__tests__/hunk/fruit2.diff Normal file
View file

@ -0,0 +1,9 @@
diff --git a/fruit b/fruit
index ef05da5..fde8dcd 100644
--- a/fruit
+++ b/fruit
@@ -1,4 +1,3 @@
apple
banana
-plum
cherry

16
src/applications/differential/storage/__tests__/hunk/offset.diff Normal file
View file

@ -0,0 +1,16 @@
diff --git a/src/ip/PhutilIPAddress.php b/src/ip/PhutilIPAddress.php
index 47c8f2e..0e216d2 100644
--- a/src/ip/PhutilIPAddress.php
+++ b/src/ip/PhutilIPAddress.php
@@ -76,9 +76,10 @@ final class PhutilIPAddress extends Phobject {
$bits .= '0';
}
}
+ break;
}
- $this->bits = $bits;
+ $this->bits = $bytes;
}
return $this->bits;

10
src/applications/differential/storage/__tests__/hunk/trailing_newline_absent.diff Normal file
View file

@ -0,0 +1,10 @@
diff --git a/newliney b/newliney
index 82ab3ce..ba1dfb1 100644
--- a/newliney
+++ b/newliney
@@ -1,3 +1,3 @@
-quack
+meow
quack
quack
\ No newline at end of file

10
src/applications/differential/storage/__tests__/hunk/trailing_newline_added.diff Normal file
View file

@ -0,0 +1,10 @@
diff --git a/newliney b/newliney
index 82ab3ce..8f44286 100644
--- a/newliney
+++ b/newliney
@@ -1,3 +1,3 @@
quack
quack
-quack
\ No newline at end of file
+quack

10
src/applications/differential/storage/__tests__/hunk/trailing_newline_removed.diff Normal file
View file

@ -0,0 +1,10 @@
diff --git a/newliney b/newliney
index 8f44286..82ab3ce 100644
--- a/newliney
+++ b/newliney
@@ -1,3 +1,3 @@
quack
quack
-quack
+quack
\ No newline at end of file