1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
|
<?php
declare(strict_types=1);
namespace League\HTMLToMarkdown\Converter;
use League\HTMLToMarkdown\ElementInterface;
class ParagraphConverter implements ConverterInterface
{
public function convert(ElementInterface $element): string
{
$value = $element->getValue();
$markdown = '';
$lines = \preg_split('/\r\n|\r|\n/', $value);
\assert($lines !== false);
foreach ($lines as $line) {
/*
* Some special characters need to be escaped based on the position that they appear
* The following function will deal with those special cases.
*/
$markdown .= $this->escapeSpecialCharacters($line);
$markdown .= "\n";
}
return \trim($markdown) !== '' ? \rtrim($markdown) . "\n\n" : '';
}
/**
* @return string[]
*/
public function getSupportedTags(): array
{
return ['p'];
}
private function escapeSpecialCharacters(string $line): string
{
$line = $this->escapeFirstCharacters($line);
$line = $this->escapeOtherCharacters($line);
$line = $this->escapeOtherCharactersRegex($line);
return $line;
}
private function escapeFirstCharacters(string $line): string
{
$escapable = [
'>',
'- ',
'+ ',
'--',
'~~~',
'---',
'- - -',
];
foreach ($escapable as $i) {
if (\strpos(\ltrim($line), $i) === 0) {
// Found a character that must be escaped, adding a backslash before
return '\\' . \ltrim($line);
}
}
return $line;
}
private function escapeOtherCharacters(string $line): string
{
$escapable = [
'<!--',
];
foreach ($escapable as $i) {
if (($pos = \strpos($line, $i)) === false) {
continue;
}
// Found an escapable character, escaping it
$line = \substr_replace($line, '\\', $pos, 0);
}
return $line;
}
private function escapeOtherCharactersRegex(string $line): string
{
$regExs = [
// Match numbers ending on ')' or '.' that are at the beginning of the line.
// They will be escaped if immediately followed by a space or newline.
'/^[0-9]+(?=(\)|\.)( |$))/',
];
foreach ($regExs as $i) {
if (! \preg_match($i, $line, $match)) {
continue;
}
// Matched an escapable character, adding a backslash on the string before the offending character
$line = \substr_replace($line, '\\', \strlen($match[0]), 0);
}
return $line;
}
}
|
