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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\Console; |
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use Railt\Console\Language\Generic; |
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use Railt\Console\Language\LanguageInterface; |
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use Railt\Io\Readable; |
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use Railt\Lexer\Result\Token; |
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use Railt\Lexer\TokenInterface; |
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/** |
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* Class Highlighter |
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*/ |
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class Highlighter |
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{ |
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/** |
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* @var int |
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*/ |
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private const CODE_SECTION_SIZE = 5; |
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/** |
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* @var array|LanguageInterface[] |
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*/ |
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private $languages = []; |
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/** |
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* Highlighter constructor. |
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* @throws \InvalidArgumentException |
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* @throws \Railt\Lexer\Exception\BadLexemeException |
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*/ |
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public function __construct() |
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{ |
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$this->add(new Generic()); |
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} |
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/** |
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* @param LanguageInterface $language |
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*/ |
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public function add(LanguageInterface $language): void |
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{ |
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\array_unshift($this->languages, $language); |
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} |
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/** |
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* @param Readable $file |
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* @param int $line |
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* @return string |
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*/ |
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public function highlight(Readable $file, int $line): string |
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{ |
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foreach ($this->languages as $language) { |
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if ($language->match($file)) { |
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return $this->renderLanguage($language, $file, $line); |
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} |
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} |
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return $file->getContents(); |
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} |
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/** |
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* @param LanguageInterface $language |
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* @param Readable $file |
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* @param int $errorLine |
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* @return string |
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*/ |
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private function renderLanguage(LanguageInterface $language, Readable $file, int $errorLine): string |
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{ |
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$result = ''; |
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$lastLine = 0; |
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foreach ($language->lex($file) as $token) { |
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foreach ($this->splitToken($token) as $child) { |
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$current = $file->getPosition($child->getOffset())->getLine(); |
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if ($this->isRenderable($errorLine, $current)) { |
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$atStart = $lastLine !== $current; |
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$result .= $errorLine === $current |
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? $this->renderErrorToken($child, $current, $atStart) |
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: $this->renderBasicToken($language, $child, $current, $atStart); |
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} |
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$lastLine = $current; |
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} |
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} |
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return $result; |
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} |
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/** |
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* @param TokenInterface $token |
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* @return iterable|TokenInterface[] |
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*/ |
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private function splitToken(TokenInterface $token): iterable |
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{ |
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$offset = $token->getOffset(); |
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$chunks = \explode("\n", $token->getValue()); |
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$size = \count($chunks); |
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foreach ($chunks as $i => $chunk) { |
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$result = new Token($token->getName(), $chunk, $offset); |
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yield $result; |
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if ($size > 1 && $size > $i + 1) { |
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yield new Token('T_WHITESPACE', "\n", $offset++); |
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} |
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$offset += $result->getBytes(); |
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} |
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} |
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/** |
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* @param int $errorLine |
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* @param int $current |
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* @return bool |
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*/ |
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private function isRenderable(int $errorLine, int $current): bool |
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{ |
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return |
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$current >= $errorLine - self::CODE_SECTION_SIZE && |
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$current <= $errorLine + self::CODE_SECTION_SIZE; |
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} |
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/** |
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* @param TokenInterface $token |
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* @param int $line |
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* @param bool $start |
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* @return string |
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*/ |
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private function renderErrorToken(TokenInterface $token, int $line, bool $start): string |
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{ |
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$prefix = $start ? \sprintf('<fg=red;bg=white;options=bold,blink>%4d |></>', $line) : ''; |
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return $prefix . '<fg=white;bg=red;options=bold>' . $token->getValue() . '</>'; |
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} |
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/** |
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* @param LanguageInterface $language |
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* @param TokenInterface $token |
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* @param int $line |
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* @param bool $start |
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* @return string |
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*/ |
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private function renderBasicToken(LanguageInterface $language, TokenInterface $token, int $line, bool $start): string |
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{ |
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$prefix = $start ? \sprintf('<fg=blue>%4d | </>', $line) : ''; |
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return $prefix . $language->highlight($token->getName(), $token->getValue()); |
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} |
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} |
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railt /
console
