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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Console; |
| 6 | |
| 7 | use ValueError; |
| 8 | |
| 9 | /** |
| 10 | * Renders the inline console markup to ANSI escape codes. |
| 11 | * |
| 12 | * Style tags are `<strong>`, `<em>`, `<dim>`, and `<u>`; color tags are |
| 13 | * the ANSI names — `<red>`, `<bright-red>`, `<gray>` — and the same set |
| 14 | * with a `bg-` prefix for backgrounds. Truecolor hex tags take a |
| 15 | * lowercase six-digit code: `<#ff7313>`, `<bg-#ff7313>`. Tags compose |
| 16 | * by nesting, the innermost tag wins on conflict. |
| 17 | * |
| 18 | * Only exact known tags are parsed; everything else — `<info@example.com>`, |
| 19 | * generics, unknown names — passes through untouched. A backslash renders |
| 20 | * a known tag literally: `\<green>`. Structural mistakes (a mismatched, |
| 21 | * dangling, or unclosed tag) throw a ValueError, also when colors are |
| 22 | * disabled, so they surface in tests. |
| 23 | * |
| 24 | * @internal |
| 25 | */ |
| 26 | final class Markup |
| 27 | { |
| 28 | private const string RESET = "\033[0m"; |
| 29 | |
| 30 | /** SGR codes by tag name. */ |
| 31 | private const array TAGS = [ |
| 32 | 'strong' => '1', |
| 33 | 'em' => '3', |
| 34 | 'dim' => '2', |
| 35 | 'u' => '4', |
| 36 | 'black' => '30', |
| 37 | 'red' => '31', |
| 38 | 'green' => '32', |
| 39 | 'yellow' => '33', |
| 40 | 'blue' => '34', |
| 41 | 'magenta' => '35', |
| 42 | 'cyan' => '36', |
| 43 | 'white' => '37', |
| 44 | 'gray' => '90', |
| 45 | 'bright-black' => '90', |
| 46 | 'bright-red' => '91', |
| 47 | 'bright-green' => '92', |
| 48 | 'bright-yellow' => '93', |
| 49 | 'bright-blue' => '94', |
| 50 | 'bright-magenta' => '95', |
| 51 | 'bright-cyan' => '96', |
| 52 | 'bright-white' => '97', |
| 53 | 'bg-black' => '40', |
| 54 | 'bg-red' => '41', |
| 55 | 'bg-green' => '42', |
| 56 | 'bg-yellow' => '43', |
| 57 | 'bg-blue' => '44', |
| 58 | 'bg-magenta' => '45', |
| 59 | 'bg-cyan' => '46', |
| 60 | 'bg-white' => '47', |
| 61 | 'bg-gray' => '100', |
| 62 | 'bg-bright-black' => '100', |
| 63 | 'bg-bright-red' => '101', |
| 64 | 'bg-bright-green' => '102', |
| 65 | 'bg-bright-yellow' => '103', |
| 66 | 'bg-bright-blue' => '104', |
| 67 | 'bg-bright-magenta' => '105', |
| 68 | 'bg-bright-cyan' => '106', |
| 69 | 'bg-bright-white' => '107', |
| 70 | ]; |
| 71 | |
| 72 | /** @var non-empty-string */ |
| 73 | private readonly string $split; |
| 74 | |
| 75 | /** @var non-empty-string */ |
| 76 | private readonly string $tag; |
| 77 | |
| 78 | public function __construct() |
| 79 | { |
| 80 | $names = implode('|', array_keys(self::TAGS)) . '|(?:bg-)?\#[0-9a-f]{6}'; |
| 81 | $this->split = "#(\\\\?</?(?:{$names})>)#"; |
| 82 | $this->tag = "#^\\\\?</?(?:{$names})>$#"; |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Renders the markup as escape codes, or strips it without `$colors`. |
| 87 | */ |
| 88 | public function render(string $text, bool $colors): string |
| 89 | { |
| 90 | if (!str_contains($text, '<')) { |
| 91 | return $text; |
| 92 | } |
| 93 | |
| 94 | /** @var list<string> $parts */ |
| 95 | $parts = (array) preg_split( |
| 96 | $this->split, |
| 97 | $text, |
| 98 | flags: PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY, |
| 99 | ); |
| 100 | $out = ''; |
| 101 | $stack = []; |
| 102 | |
| 103 | foreach ($parts as $part) { |
| 104 | if (preg_match($this->tag, $part) !== 1) { |
| 105 | $out .= $part; |
| 106 | |
| 107 | continue; |
| 108 | } |
| 109 | |
| 110 | if ($part[0] === '\\') { |
| 111 | $out .= substr($part, offset: 1); |
| 112 | |
| 113 | continue; |
| 114 | } |
| 115 | |
| 116 | if ($part[1] === '/') { |
| 117 | $name = substr($part, offset: 2, length: -1); |
| 118 | $last = array_pop($stack); |
| 119 | |
| 120 | if ($last === null) { |
| 121 | throw new ValueError("Markup tag '</{$name}>' has no opening tag"); |
| 122 | } |
| 123 | |
| 124 | if ($last !== $name) { |
| 125 | throw new ValueError("Markup tag '<{$last}>' closed by '</{$name}>'"); |
| 126 | } |
| 127 | |
| 128 | if ($colors) { |
| 129 | // A blanket reset, then re-apply the enclosing tags. |
| 130 | $out .= self::RESET; |
| 131 | |
| 132 | foreach ($stack as $open) { |
| 133 | $out .= "\033[" . $this->sgr($open) . 'm'; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | continue; |
| 138 | } |
| 139 | |
| 140 | $name = substr($part, offset: 1, length: -1); |
| 141 | $stack[] = $name; |
| 142 | |
| 143 | if ($colors) { |
| 144 | $out .= "\033[" . $this->sgr($name) . 'm'; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | if ($stack !== []) { |
| 149 | throw new ValueError("Unclosed markup tag '<{$stack[array_key_last($stack)]}>'"); |
| 150 | } |
| 151 | |
| 152 | return $out; |
| 153 | } |
| 154 | |
| 155 | /** The SGR code for a tag name: a named lookup or a truecolor hex tag. */ |
| 156 | private function sgr(string $name): string |
| 157 | { |
| 158 | if (array_key_exists($name, self::TAGS)) { |
| 159 | return self::TAGS[$name]; |
| 160 | } |
| 161 | |
| 162 | $bg = str_starts_with($name, 'bg-'); |
| 163 | $hex = substr($name, offset: $bg ? 4 : 1); |
| 164 | |
| 165 | return ( |
| 166 | ($bg ? '48' : '38') . ';2;' . implode(';', array_map(hexdec(...), str_split($hex, length: 2))) |
| 167 | ); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Escapes known tags and strips control characters so the text |
| 172 | * prints literally. |
| 173 | * |
| 174 | * Everything C0 except newline and tab is removed, DEL included, so |
| 175 | * arbitrary text cannot inject terminal escape sequences (ESC, BEL, |
| 176 | * carriage returns, ...). |
| 177 | */ |
| 178 | public function escape(string $text): string |
| 179 | { |
| 180 | $text = (string) preg_replace('/[\x00-\x08\x0B-\x1F\x7F]/', replacement: '', subject: $text); |
| 181 | |
| 182 | return (string) preg_replace($this->split, replacement: '\\\\$0', subject: $text); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * The visible width of the text: tags collapse to nothing, an |
| 187 | * escaped tag to the tag without its backslash. |
| 188 | */ |
| 189 | public function width(string $text): int |
| 190 | { |
| 191 | if (str_contains($text, '<')) { |
| 192 | $text = (string) preg_replace_callback( |
| 193 | $this->split, |
| 194 | static fn(array $match): string => $match[0][0] === '\\' ? substr($match[0], offset: 1) : '', |
| 195 | $text, |
| 196 | ); |
| 197 | } |
| 198 | |
| 199 | return mb_strwidth($text); |
| 200 | } |
| 201 | } |