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give / vendor / fakerphp / faker / src / Faker / Provider / Text.php

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Text.php

142 lines

1	<?php
2
3	namespace Faker\Provider;
4
5	abstract class Text extends Base
6	{
7	protected static $baseText = '';
8	protected static $separator = ' ';
9	protected static $separatorLen = 1;
10	protected $explodedText;
11	protected $consecutiveWords = array();
12	protected static $textStartsWithUppercase = true;
13
14	/**
15	* Generate a text string by the Markov chain algorithm.
16	*
17	* Depending on the $maxNbChars, returns a random valid looking text. The algorithm
18	* generates a weighted table with the specified number of words as the index and the
19	* possible following words as the value.
20	*
21	* @example 'Alice, swallowing down her flamingo, and began by taking the little golden key'
22	* @param integer $maxNbChars Maximum number of characters the text should contain (minimum: 10)
23	* @param integer $indexSize Determines how many words are considered for the generation of the next word.
24	* The minimum is 1, and it produces a higher level of randomness, although the
25	* generated text usually doesn't make sense. Higher index sizes (up to 5)
26	* produce more correct text, at the price of less randomness.
27	* @return string
28	*/
29	public function realText($maxNbChars = 200, $indexSize = 2)
30	{
31	if ($maxNbChars < 10) {
32	throw new \InvalidArgumentException('maxNbChars must be at least 10');
33	}
34
35	if ($indexSize < 1) {
36	throw new \InvalidArgumentException('indexSize must be at least 1');
37	}
38
39	if ($indexSize > 5) {
40	throw new \InvalidArgumentException('indexSize must be at most 5');
41	}
42
43	$words = $this->getConsecutiveWords($indexSize);
44	$result = array();
45	$resultLength = 0;
46	// take a random starting point
47	$next = static::randomKey($words);
48	while ($resultLength < $maxNbChars && isset($words[$next])) {
49	// fetch a random word to append
50	$word = static::randomElement($words[$next]);
51
52	// calculate next index
53	$currentWords = static::explode($next);
54	$currentWords[] = $word;
55	array_shift($currentWords);
56	$next = static::implode($currentWords);
57
58	// ensure text starts with an uppercase letter
59	if ($resultLength == 0 && !static::validStart($word)) {
60	continue;
61	}
62
63	// append the element
64	$result[] = $word;
65	$resultLength += static::strlen($word) + static::$separatorLen;
66	}
67
68	// remove the element that caused the text to overflow
69	array_pop($result);
70
71	// build result
72	$result = static::implode($result);
73
74	return static::appendEnd($result);
75	}
76
77	protected function getConsecutiveWords($indexSize)
78	{
79	if (!isset($this->consecutiveWords[$indexSize])) {
80	$parts = $this->getExplodedText();
81	$words = array();
82	$index = array();
83	for ($i = 0; $i < $indexSize; $i++) {
84	$index[] = array_shift($parts);
85	}
86
87	for ($i = 0, $count = count($parts); $i < $count; $i++) {
88	$stringIndex = static::implode($index);
89	if (!isset($words[$stringIndex])) {
90	$words[$stringIndex] = array();
91	}
92	$word = $parts[$i];
93	$words[$stringIndex][] = $word;
94	array_shift($index);
95	$index[] = $word;
96	}
97	// cache look up words for performance
98	$this->consecutiveWords[$indexSize] = $words;
99	}
100
101	return $this->consecutiveWords[$indexSize];
102	}
103
104	protected function getExplodedText()
105	{
106	if ($this->explodedText === null) {
107	$this->explodedText = static::explode(preg_replace('/\s+/u', ' ', static::$baseText));
108	}
109
110	return $this->explodedText;
111	}
112
113	protected static function explode($text)
114	{
115	return explode(static::$separator, $text);
116	}
117
118	protected static function implode($words)
119	{
120	return implode(static::$separator, $words);
121	}
122
123	protected static function strlen($text)
124	{
125	return function_exists('mb_strlen') ? mb_strlen($text, 'UTF-8') : strlen($text);
126	}
127
128	protected static function validStart($word)
129	{
130	$isValid = true;
131	if (static::$textStartsWithUppercase) {
132	$isValid = preg_match('/^\p{Lu}/u', $word);
133	}
134	return $isValid;
135	}
136
137	protected static function appendEnd($text)
138	{
139	return preg_replace("/([ ,-:;\x{2013}\x{2014}]+$)/us", '', $text).'.';
140	}
141	}
142