Text_Diff_Engine_string::parseContextDiff() - Code Metrics - ntwb/wordpress - Measure and Improve Code Quality continuously with Scrutinizer

Text_Diff_Engine_string::parseContextDiff() F
last analyzed 2017-06-24 04:06 UTC

↳ Parent: Text_Diff_Engine_string

Complexity

Conditions	44
Paths	14689

Size

Total Lines	101
Code Lines	75

Duplication

Lines	30
Ratio	29.7 %

Importance

Changes

Metric	Value
cc	44
eloc	75
nc	14689
nop	1
dl	30
loc	101
rs	2
c	0
b	0
f	0

How to fix Long Method Complexity

<?php
/**
 * Parses unified or context diffs output from eg. the diff utility.
 *
 * Example:
 * <code>
 * $patch = file_get_contents('example.patch');
 * $diff = new Text_Diff('string', array($patch));
 * $renderer = new Text_Diff_Renderer_inline();
 * echo $renderer->render($diff);
 * </code>
 *
 * Copyright 2005 Örjan Persson <[email protected]>
 * Copyright 2005-2010 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
 *
 * @author  Örjan Persson <[email protected]>
 * @package Text_Diff
 * @since   0.2.0
 */
class Text_Diff_Engine_string {

    /**
     * Parses a unified or context diff.
     *
     * First param contains the whole diff and the second can be used to force
     * a specific diff type. If the second parameter is 'autodetect', the
     * diff will be examined to find out which type of diff this is.
     *
     * @param string $diff  The diff content.
     * @param string $mode  The diff mode of the content in $diff. One of
     *                      'context', 'unified', or 'autodetect'.
     *
     * @return array  List of all diff operations.
     */
    function diff($diff, $mode = 'autodetect')
    {
        // Detect line breaks.
        $lnbr = "\n";
        if (strpos($diff, "\r\n") !== false) {
            $lnbr = "\r\n";
        } elseif (strpos($diff, "\r") !== false) {
            $lnbr = "\r";
        }

        // Make sure we have a line break at the EOF.
        if (substr($diff, -strlen($lnbr)) != $lnbr) {
            $diff .= $lnbr;
        }

        if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') {
            return PEAR::raiseError('Type of diff is unsupported');
        }

        if ($mode == 'autodetect') {
            $context = strpos($diff, '***');
            $unified = strpos($diff, '---');
            if ($context === $unified) {
                return PEAR::raiseError('Type of diff could not be detected');
            } elseif ($context === false || $unified === false) {
                $mode = $context !== false ? 'context' : 'unified';
            } else {
                $mode = $context < $unified ? 'context' : 'unified';
            }
        }

        // Split by new line and remove the diff header, if there is one.
        $diff = explode($lnbr, $diff);
        if (($mode == 'context' && strpos($diff[0], '***') === 0) ||
            ($mode == 'unified' && strpos($diff[0], '---') === 0)) {
            array_shift($diff);
            array_shift($diff);
        }

        if ($mode == 'context') {
            return $this->parseContextDiff($diff);
        } else {
            return $this->parseUnifiedDiff($diff);
        }
    }

    /**
     * Parses an array containing the unified diff.
     *
     * @param array $diff  Array of lines.
     *
     * @return array  List of all diff operations.
     */
    function parseUnifiedDiff($diff)
    {
        $edits = array();
        $end = count($diff) - 1;
        for ($i = 0; $i < $end;) {
            $diff1 = array();
            switch (substr($diff[$i], 0, 1)) {
            case ' ':
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == ' ');
                $edits[] = new Text_Diff_Op_copy($diff1);
                break;

            case '+':
                // get all new lines
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '+');
                $edits[] = new Text_Diff_Op_add($diff1);
                break;

            case '-':
                // get changed or removed lines
                $diff2 = array();
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '-');

                while ($i < $end && substr($diff[$i], 0, 1) == '+') {
                    $diff2[] = substr($diff[$i++], 1);
                }
                if (count($diff2) == 0) {
                    $edits[] = new Text_Diff_Op_delete($diff1);
                } else {
                    $edits[] = new Text_Diff_Op_change($diff1, $diff2);
                }
                break;

            default:
                $i++;
                break;
            }
        }

        return $edits;
    }

    /**
     * Parses an array containing the context diff.
     *
     * @param array $diff  Array of lines.
     *
     * @return array  List of all diff operations.
     */
    function parseContextDiff(&$diff)
    {
        $edits = array();
        $i = $max_i = $j = $max_j = 0;
        $end = count($diff) - 1;
        while ($i < $end && $j < $end) {
            while ($i >= $max_i && $j >= $max_j) {
                // Find the boundaries of the diff output of the two files
                for ($i = $j;
                     $i < $end && substr($diff[$i], 0, 3) == '***';
                     $i++);
                for ($max_i = $i;
                     $max_i < $end && substr($diff[$max_i], 0, 3) != '---';
                     $max_i++);
                for ($j = $max_i;
                     $j < $end && substr($diff[$j], 0, 3) == '---';
                     $j++);
                for ($max_j = $j;
                     $max_j < $end && substr($diff[$max_j], 0, 3) != '***';
                     $max_j++);
            }

            // find what hasn't been changed
            $array = array();
            while ($i < $max_i &&
                   $j < $max_j &&
                   strcmp($diff[$i], $diff[$j]) == 0) {
                $array[] = substr($diff[$i], 2);
                $i++;
                $j++;
            }

            while ($i < $max_i && ($max_j-$j) <= 1) {
                if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') {
                    break;
                }
                $array[] = substr($diff[$i++], 2);
            }

            while ($j < $max_j && ($max_i-$i) <= 1) {
                if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') {
                    break;
                }
                $array[] = substr($diff[$j++], 2);
            }
            if (count($array) > 0) {
                $edits[] = new Text_Diff_Op_copy($array);
            }

            if ($i < $max_i) {
                $diff1 = array();
                switch (substr($diff[$i], 0, 1)) {
                case '!':
                    $diff2 = array();
                    do {
                        $diff1[] = substr($diff[$i], 2);
                        if ($j < $max_j && substr($diff[$j], 0, 1) == '!') {
                            $diff2[] = substr($diff[$j++], 2);
                        }
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '!');
                    $edits[] = new Text_Diff_Op_change($diff1, $diff2);
                    break;

                case '+':
                    do {
                        $diff1[] = substr($diff[$i], 2);
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '+');
                    $edits[] = new Text_Diff_Op_add($diff1);
                    break;

                case '-':
                    do {
                        $diff1[] = substr($diff[$i], 2);
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '-');
                    $edits[] = new Text_Diff_Op_delete($diff1);
                    break;
                }
            }

            if ($j < $max_j) {
                $diff2 = array();
                switch (substr($diff[$j], 0, 1)) {
                case '+':
                    do {
                        $diff2[] = substr($diff[$j++], 2);
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '+');
                    $edits[] = new Text_Diff_Op_add($diff2);
                    break;

                case '-':
                    do {
                        $diff2[] = substr($diff[$j++], 2);
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '-');
                    $edits[] = new Text_Diff_Op_delete($diff2);
                    break;
                }
            }
        }

        return $edits;
    }

}


1		<?php
2		/**
3		* Parses unified or context diffs output from eg. the diff utility.
4		*
5		* Example:
6		* <code>
7		* $patch = file_get_contents('example.patch');
8		* $diff = new Text_Diff('string', array($patch));
9		* $renderer = new Text_Diff_Renderer_inline();
10		* echo $renderer->render($diff);
11		* </code>
12		*
13		* Copyright 2005 Örjan Persson <[email protected]>
14		* Copyright 2005-2010 The Horde Project (http://www.horde.org/)
15		*
16		* See the enclosed file COPYING for license information (LGPL). If you did
17		* not receive this file, see http://opensource.org/licenses/lgpl-license.php.
18		*
19		* @author Örjan Persson <[email protected]>
20		* @package Text_Diff
21		* @since 0.2.0
22		*/
23		class Text_Diff_Engine_string {
24
25		/**
26		* Parses a unified or context diff.
27		*
28		* First param contains the whole diff and the second can be used to force
29		* a specific diff type. If the second parameter is 'autodetect', the
30		* diff will be examined to find out which type of diff this is.
31		*
32		* @param string $diff The diff content.
33		* @param string $mode The diff mode of the content in $diff. One of
34		* 'context', 'unified', or 'autodetect'.
35		*
36		* @return array List of all diff operations.
37		*/
38		function diff($diff, $mode = 'autodetect')
39		{
40		// Detect line breaks.
41		$lnbr = "\n";
42	View Code Duplication	if (strpos($diff, "\r\n") !== false) {
43		$lnbr = "\r\n";
44		} elseif (strpos($diff, "\r") !== false) {
45		$lnbr = "\r";
46		}
47
48		// Make sure we have a line break at the EOF.
49		if (substr($diff, -strlen($lnbr)) != $lnbr) {
50		$diff .= $lnbr;
51		}
52
53		if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') {
54		return PEAR::raiseError('Type of diff is unsupported');
55		}
56
57		if ($mode == 'autodetect') {
58		$context = strpos($diff, '***');
59		$unified = strpos($diff, '---');
60		if ($context === $unified) {
61		return PEAR::raiseError('Type of diff could not be detected');
62		} elseif ($context === false \|\| $unified === false) {
63		$mode = $context !== false ? 'context' : 'unified';
64		} else {
65		$mode = $context < $unified ? 'context' : 'unified';
66		}
67		}
68
69		// Split by new line and remove the diff header, if there is one.
70		$diff = explode($lnbr, $diff);
71		if (($mode == 'context' && strpos($diff[0], '***') === 0) \|\|
72		($mode == 'unified' && strpos($diff[0], '---') === 0)) {
73		array_shift($diff);
74		array_shift($diff);
75		}
76
77		if ($mode == 'context') {
78		return $this->parseContextDiff($diff);
79		} else {
80		return $this->parseUnifiedDiff($diff);
81		}
82		}
83
84		/**
85		* Parses an array containing the unified diff.
86		*
87		* @param array $diff Array of lines.
88		*
89		* @return array List of all diff operations.
90		*/
91		function parseUnifiedDiff($diff)
92		{
93		$edits = array();
94		$end = count($diff) - 1;
95		for ($i = 0; $i < $end;) {
96		$diff1 = array();
97		switch (substr($diff[$i], 0, 1)) {
98		case ' ':
99		do {
100		$diff1[] = substr($diff[$i], 1);
101		} while (++$i < $end && substr($diff[$i], 0, 1) == ' ');
102		$edits[] = new Text_Diff_Op_copy($diff1);
103		break;
104
105	View Code Duplication	case '+':
106		// get all new lines
107		do {
108		$diff1[] = substr($diff[$i], 1);
109		} while (++$i < $end && substr($diff[$i], 0, 1) == '+');
110		$edits[] = new Text_Diff_Op_add($diff1);
111		break;
112
113		case '-':
114		// get changed or removed lines
115		$diff2 = array();
116		do {
117		$diff1[] = substr($diff[$i], 1);
118		} while (++$i < $end && substr($diff[$i], 0, 1) == '-');
119
120		while ($i < $end && substr($diff[$i], 0, 1) == '+') {
121		$diff2[] = substr($diff[$i++], 1);
122		}
123		if (count($diff2) == 0) {
124		$edits[] = new Text_Diff_Op_delete($diff1);
125		} else {
126		$edits[] = new Text_Diff_Op_change($diff1, $diff2);
127		}
128		break;
129
130		default:
131		$i++;
132		break;
133		}
134		}
135
136		return $edits;
137		}
138
139		/**
140		* Parses an array containing the context diff.
141		*
142		* @param array $diff Array of lines.
143		*
144		* @return array List of all diff operations.
145		*/
146		function parseContextDiff(&$diff)
147		{
148		$edits = array();
149		$i = $max_i = $j = $max_j = 0;
150		$end = count($diff) - 1;
151		while ($i < $end && $j < $end) {
152		while ($i >= $max_i && $j >= $max_j) {
153		// Find the boundaries of the diff output of the two files
154		for ($i = $j;
155		$i < $end && substr($diff[$i], 0, 3) == '***';
156		$i++);
157		for ($max_i = $i;
158		$max_i < $end && substr($diff[$max_i], 0, 3) != '---';
159		$max_i++);
160		for ($j = $max_i;
161		$j < $end && substr($diff[$j], 0, 3) == '---';
162		$j++);
163		for ($max_j = $j;
164		$max_j < $end && substr($diff[$max_j], 0, 3) != '***';
165		$max_j++);
166		}
167
168		// find what hasn't been changed
169		$array = array();
170		while ($i < $max_i &&
171		$j < $max_j &&
172		strcmp($diff[$i], $diff[$j]) == 0) {
173		$array[] = substr($diff[$i], 2);
174		$i++;
175		$j++;
176		}
177
178	View Code Duplication	while ($i < $max_i && ($max_j-$j) <= 1) {
179		if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') {
180		break;
181		}
182		$array[] = substr($diff[$i++], 2);
183		}
184
185	View Code Duplication	while ($j < $max_j && ($max_i-$i) <= 1) {
186		if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') {
187		break;
188		}
189		$array[] = substr($diff[$j++], 2);
190		}
191		if (count($array) > 0) {
192		$edits[] = new Text_Diff_Op_copy($array);
193		}
194
195		if ($i < $max_i) {
196		$diff1 = array();
197		switch (substr($diff[$i], 0, 1)) {
198		case '!':
199		$diff2 = array();
200		do {
201		$diff1[] = substr($diff[$i], 2);
202		if ($j < $max_j && substr($diff[$j], 0, 1) == '!') {
203		$diff2[] = substr($diff[$j++], 2);
204		}
205		} while (++$i < $max_i && substr($diff[$i], 0, 1) == '!');
206		$edits[] = new Text_Diff_Op_change($diff1, $diff2);
207		break;
208
209	View Code Duplication	case '+':
210		do {
211		$diff1[] = substr($diff[$i], 2);
212		} while (++$i < $max_i && substr($diff[$i], 0, 1) == '+');
213		$edits[] = new Text_Diff_Op_add($diff1);
214		break;
215
216		case '-':
217		do {
218		$diff1[] = substr($diff[$i], 2);
219		} while (++$i < $max_i && substr($diff[$i], 0, 1) == '-');
220		$edits[] = new Text_Diff_Op_delete($diff1);
221		break;
222		}
223		}
224
225		if ($j < $max_j) {
226		$diff2 = array();
227		switch (substr($diff[$j], 0, 1)) {
228	View Code Duplication	case '+':
229		do {
230		$diff2[] = substr($diff[$j++], 2);
231		} while ($j < $max_j && substr($diff[$j], 0, 1) == '+');
232		$edits[] = new Text_Diff_Op_add($diff2);
233		break;
234
235	View Code Duplication	case '-':
236		do {
237		$diff2[] = substr($diff[$j++], 2);
238		} while ($j < $max_j && substr($diff[$j], 0, 1) == '-');
239		$edits[] = new Text_Diff_Op_delete($diff2);
240		break;
241		}
242		}
243		}
244
245		return $edits;
246		}
247
248		}
249

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Text_Diff_Engine_string::parseContextDiff() F last analyzed 2017-06-24 04:06 UTC

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Text_Diff_Engine_string::parseContextDiff() F
last analyzed 2017-06-24 04:06 UTC