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1 | <?php |
2 | |
3 | declare(strict_types=1); |
4 | |
5 | namespace Hyde\Framework\Actions; |
6 | |
7 | use RuntimeException; |
8 | use Hyde\Facades\Filesystem; |
9 | |
10 | use function str_ends_with; |
11 | use function str_starts_with; |
12 | use function substr_count; |
13 | use function json_decode; |
14 | use function explode; |
15 | use function strlen; |
16 | use function strpos; |
17 | use function substr; |
18 | use function trim; |
19 | |
20 | /** |
21 | * @experimental Parse the front matter in a Blade file. |
22 | * |
23 | * Accepts a string to make it easier to mock when testing. |
24 | * |
25 | * @phpstan-consistent-constructor |
26 | * |
27 | * === DOCUMENTATION (draft) === |
28 | * |
29 | * ## Front Matter in Markdown |
30 | * |
31 | * HydePHP uses a special syntax called BladeMatter that allows you to define variables in a Blade file, |
32 | * and have Hyde statically parse them into the front matter of the page model. This allows metadata |
33 | * in your Blade pages to be used when Hyde generates dynamic data like page titles and SEO tags. |
34 | * |
35 | * ### Syntax |
36 | * |
37 | * Any line following the syntax below will be added to the parsed page object's front matter. |
38 | * |
39 | * @example `@php($title = 'BladeMatter Test')` |
40 | * This would then be parsed into the following array in the page model: ['title' => 'BladeMatter Test'] |
41 | * |
42 | * ### Limitations |
43 | * Each directive must be on its own line, and start with `@php($.`. Arrays are currently not supported. |
44 | */ |
45 | class BladeMatterParser |
46 | { |
47 | protected string $contents; |
48 | protected array $matter; |
49 | |
50 | /** @var string The directive signature used to determine if a line should be parsed. */ |
51 | protected const SEARCH = '@php($'; |
52 | |
53 | public static function parseFile(string $path): array |
54 | { |
55 | return static::parseString(Filesystem::getContents($path)); |
56 | } |
57 | |
58 | public static function parseString(string $contents): array |
59 | { |
60 | return (new static($contents))->parse()->get(); |
61 | } |
62 | |
63 | public function __construct(string $contents) |
64 | { |
65 | $this->contents = $contents; |
66 | } |
67 | |
68 | public function get(): array |
69 | { |
70 | return $this->matter; |
71 | } |
72 | |
73 | public function parse(): static |
74 | { |
75 | $this->matter = []; |
76 | |
77 | $lines = explode("\n", $this->contents); |
78 | |
79 | foreach ($lines as $line) { |
80 | if (static::lineMatchesFrontMatter($line)) { |
81 | $this->matter[static::extractKey($line)] = static::getValueWithType(static::extractValue($line)); |
82 | } |
83 | } |
84 | |
85 | return $this; |
86 | } |
87 | |
88 | protected static function lineMatchesFrontMatter(string $line): bool |
89 | { |
90 | return str_starts_with($line, static::SEARCH); |
91 | } |
92 | |
93 | protected static function extractKey(string $line): string |
94 | { |
95 | // Remove search prefix |
96 | $key = substr($line, strlen(static::SEARCH)); |
97 | |
98 | // Remove everything after the first equals sign |
99 | $key = substr($key, 0, strpos($key, '=')); |
100 | |
101 | // Return trimmed line |
102 | return trim($key); |
103 | } |
104 | |
105 | protected static function extractValue(string $line): string |
106 | { |
107 | // Trim any trailing spaces and newlines |
108 | $key = trim($line); |
109 | |
110 | // Remove everything before the first equals sign |
111 | $key = substr($key, strpos($key, '=') + 1); |
112 | |
113 | // Remove closing parenthesis |
114 | $key = substr($key, 0, strlen($key) - 1); |
115 | |
116 | // Remove any quotes so we can normalize the value |
117 | $key = trim($key, ' "\''); |
118 | |
119 | // Return trimmed line |
120 | return trim($key); |
121 | } |
122 | |
123 | /** @return scalar|array<string, scalar> */ |
124 | protected static function getValueWithType(string $value): mixed |
125 | { |
126 | $value = trim($value); |
127 | |
128 | if ($value === 'null') { |
129 | return null; |
130 | } |
131 | |
132 | if (static::isValueArrayString($value)) { |
133 | return static::parseArrayString($value); |
134 | } |
135 | |
136 | // This will cast integers, floats, and booleans to their respective types |
137 | // Still working on a way to handle multidimensional arrays and objects |
138 | |
139 | /** @var scalar|null $decoded */ |
140 | $decoded = json_decode($value); |
141 | |
142 | return $decoded ?? $value; |
143 | } |
144 | |
145 | /** @return array<string, scalar> */ |
146 | protected static function parseArrayString(string $string): array |
147 | { |
148 | $array = []; |
149 | |
150 | // Trim input string |
151 | $string = trim($string); |
152 | |
153 | // Check if string is an array |
154 | if (! static::isValueArrayString($string)) { |
155 | throw new RuntimeException('Failed parsing BladeMatter array. Input string must follow array syntax.'); |
156 | } |
157 | |
158 | // Check if string is multidimensional (not yet supported) |
159 | if ((substr_count($string, '[') > 1) || (substr_count($string, ']') > 1)) { |
160 | throw new RuntimeException('Failed parsing BladeMatter array. Multidimensional arrays are not supported yet.'); |
161 | } |
162 | |
163 | // Remove opening and closing brackets |
164 | $string = substr($string, 1, strlen($string) - 2); |
165 | |
166 | // Tokenize string between commas |
167 | $tokens = explode(',', $string); |
168 | |
169 | // Parse each token |
170 | foreach ($tokens as $token) { |
171 | // Split string into key/value pairs |
172 | $pair = explode('=>', $token); |
173 | |
174 | // Add key/value pair to array |
175 | $key = (string) static::getValueWithType(trim(trim($pair[0]), "'")); |
176 | $value = static::getValueWithType(trim(trim($pair[1]), "'")); |
177 | |
178 | $array[$key] = $value; |
179 | } |
180 | |
181 | return $array; |
182 | } |
183 | |
184 | protected static function isValueArrayString(string $string): bool |
185 | { |
186 | return str_starts_with($string, '[') && str_ends_with($string, ']'); |
187 | } |
188 | } |