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author | Christopher Smith <chris@jalakai.co.uk> | 2015-05-28 16:37:32 +0100 |
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committer | Christopher Smith <chris@jalakai.co.uk> | 2015-05-28 17:03:06 +0100 |
commit | 9a734b7aaba1445e06c1ccb95e59f54e01688d45 (patch) | |
tree | 1a84c75c8f7c98de1c149c443f17a9422a8be5df | |
parent | 2b71c2eece46d1e977fa596ed57b74e04a9aaf6b (diff) | |
download | rpg-9a734b7aaba1445e06c1ccb95e59f54e01688d45.tar.gz rpg-9a734b7aaba1445e06c1ccb95e59f54e01688d45.tar.bz2 |
Refactor code to make it simpler.
The changes should also:
- fix unlikely edge case when replacement line is the same as the
old line (would have resulted in timeout)
- reduce memory footprint
- avoid applying string search beyond maxlines replacement limit
-rw-r--r-- | _test/tests/inc/io_replaceinfile.test.php | 28 | ||||
-rw-r--r-- | inc/io.php | 35 |
2 files changed, 41 insertions, 22 deletions
diff --git a/_test/tests/inc/io_replaceinfile.test.php b/_test/tests/inc/io_replaceinfile.test.php index 98f21868f..c2dbc0dd4 100644 --- a/_test/tests/inc/io_replaceinfile.test.php +++ b/_test/tests/inc/io_replaceinfile.test.php @@ -2,6 +2,8 @@ class io_replaceinfile_test extends DokuWikiTest { + protected $contents = "The\012Delete\012Delete\012Delete01\012Delete02\012Delete\012DeleteX\012Test\012"; + /* * dependency for tests needing zlib extension to pass */ @@ -21,8 +23,8 @@ class io_replaceinfile_test extends DokuWikiTest { } function _write($file){ - $contents = "The\012Delete\012Delete\012Delete01\012Delete02\012Delete\012DeleteX\012Test\012"; - io_saveFile($file, $contents); + + io_saveFile($file, $this->contents); // Replace one, no regex $this->assertTrue(io_replaceInFile($file, "Delete\012", "Delete00\012", false, 1)); $this->assertEquals("The\012Delete00\012Delete\012Delete01\012Delete02\012Delete\012DeleteX\012Test\012", io_readFile($file)); @@ -41,6 +43,7 @@ class io_replaceinfile_test extends DokuWikiTest { $this->_write(TMP_DIR.'/test.txt'); } + /** * @depends test_ext_zlib */ @@ -55,4 +58,25 @@ class io_replaceinfile_test extends DokuWikiTest { $this->_write(TMP_DIR.'/test.txt.bz2'); } + /** + * + */ + function test_edgecase1() + { + $file = TMP_DIR . '/test.txt'; + // Replace all, no regex, backreference like construct in replacement line + io_saveFile($file, $this->contents); + $this->assertTrue(io_replaceInFile($file, "Delete\012", "Delete\\00\012", false, -1)); + $this->assertEquals("The\012Delete\\00\012Delete\\00\012Delete01\012Delete02\012Delete\\00\012DeleteX\012Test\012", io_readFile($file), "Edge case: backreference like construct in replacement line"); + } + /** + * @small + */ + function test_edgecase2() { + $file = TMP_DIR.'/test.txt'; + // Replace all, no regex, replacement line == search line + io_saveFile($file, $this->contents); + $this->assertTrue(io_replaceInFile($file, "Delete\012", "Delete\012", false, -1)); + $this->assertEquals("The\012Delete\012Delete\012Delete01\012Delete02\012Delete\012DeleteX\012Test\012", io_readFile($file), "Edge case: new line the same as old line"); + } } diff --git a/inc/io.php b/inc/io.php index dbb42114b..51ca2ea14 100644 --- a/inc/io.php +++ b/inc/io.php @@ -311,28 +311,23 @@ function io_replaceInFile($file, $oldline, $newline, $regex=false, $maxlines=0) $lines = file($file); } - // remove all matching lines - if ($regex) { - if($maxlines > 0) { - $matches = preg_grep($oldline, $lines); - $count = 0; - foreach($matches as $ix=>$m) { - $lines[$ix] = preg_replace($oldline, $newline, $m); - if(++$count >= $maxlines) break; - } - } else { - $lines = ($maxlines == 0) ? preg_grep($oldline, $lines, PREG_GREP_INVERT) - : preg_replace($oldline, $newline, $lines, $maxlines); - } - } else { + // make non-regexes into regexes + $pattern = $regex ? $oldline : '/'.preg_quote($oldline,'/').'/'; + $replace = $regex ? $newline : addcslashes($newline, '\$'); + + // remove matching lines + if ($maxlines > 0) { $count = 0; - $replaceline = $maxlines == 0 ? '' : $newline; - $pos = array_search($oldline,$lines); //return null or false if not found - while(is_int($pos)){ - $lines[$pos] = $replaceline; - if($maxlines > 0 && ++$count >= $maxlines) break; - $pos = array_search($oldline,$lines); + $matched = 0; + while (($count < $maxlines) && (list($i,$line) = each($lines))) { + // $matched will be set to 0|1 depending on whether pattern is matched and line replaced + $lines[$i] = preg_replace($pattern, $replace, $line, -1, $matched); + if ($matched) $count++; } + } else { + $lines = ($maxlines == 0) ? + preg_grep($pattern, $lines, PREG_GREP_INVERT) : + preg_replace($pattern, $replace, $lines); } if($maxlines == 0 && ((string)$newline) !== '') { |