Hyde\Framework\Actions\BladeMatterParser

Complexity

Total Complexity

20

Size/Duplication

Total Lines	133
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

11 Methods

Rating	Name	Duplication	Size	Complexity
A	get()	0	3	1
A	parseArrayString()	0	33	5
A	parse()	0	13	3
A	isValueArrayString()	0	3	2
A	__construct()	0	3	1
A	parseString()	0	3	1
A	parseFile()	0	3	1
A	extractKey()	0	10	1
A	getValueWithType()	0	15	3
A	extractValue()	0	16	1
A	lineMatchesFrontMatter()	0	3	1

<?php

declare(strict_types=1);

namespace Hyde\Framework\Actions;

use function explode;
use function file_get_contents;
use Hyde\Hyde;
use function json_decode;
use RuntimeException;
use function strlen;
use function strpos;
use function substr;
use function substr_count;
use function trim;

/**
 * Parse the front matter in a Blade file.
 *
 * Accepts a string to make it easier to mock when testing.
 *
 * @see \Hyde\Framework\Testing\Feature\BladeMatterParserTest
 * @phpstan-consistent-constructor
 *
 * === DOCUMENTATION (draft) ===
 *
 * ## Front Matter in Markdown
 *
 * HydePHP uses a special syntax called BladeMatter that allows you to define variables in a Blade file,
 * and have Hyde statically parse them into the front matter of the page model. This allows metadata
 * in your Blade pages to be used when Hyde generates dynamic data like page titles and SEO tags.
 *
 * ### Syntax
 *
 * Any line following the syntax below will be added to the parsed page object's front matter.
 *
 * @example `@php($title = 'BladeMatter Test')`
 * This would then be parsed into the following array in the page model: ['title' => 'BladeMatter Test']
 *
 * ### Limitations
 * Each directive must be on its own line, and start with `@php($.`. Arrays are currently not supported.
 */
class BladeMatterParser
{
    protected string $contents;
    protected array $matter;

    /** The directive signature used to determine if a line should be parsed. */
    protected const SEARCH = '@php($';

    public static function parseFile(string $localFilePath): array
    {
        return static::parseString(file_get_contents(Hyde::path($localFilePath)));
    }

    public static function parseString(string $contents): array
    {
        return (new static($contents))->parse()->get();
    }

    public function __construct(string $contents)
    {
        $this->contents = $contents;
    }

    public function get(): array
    {
        return $this->matter;
    }

    public function parse(): static
    {
        $this->matter = [];

        $lines = explode("\n", $this->contents);

        foreach ($lines as $line) {
            if (static::lineMatchesFrontMatter($line)) {
                $this->matter[static::extractKey($line)] = static::getValueWithType(static::extractValue($line));
            }
        }

        return $this;
    }

    protected static function lineMatchesFrontMatter(string $line): bool
    {
        return str_starts_with($line, static::SEARCH);
    }

    protected static function extractKey(string $line): string
    {
        // Remove search prefix
        $key = substr($line, strlen(static::SEARCH));

        // Remove everything after the first equals sign
        $key = substr($key, 0, strpos($key, '='));

        // Return trimmed line
        return trim($key);
    }

    protected static function extractValue(string $line): string
    {
        // Trim any trailing spaces and newlines
        $key = trim($line);

        // Remove everything before the first equals sign
        $key = substr($key, strpos($key, '=') + 1);

        // Remove closing parenthesis
        $key = substr($key, 0, strlen($key) - 1);

        // Remove any quotes so we can normalize the value
        $key = trim($key, ' "\'');

        // Return trimmed line
        return trim($key);
    }

    protected static function getValueWithType(string $value): mixed
    {
        $value = trim($value);

        if ($value === 'null') {
            return null;
        }

        if (static::isValueArrayString($value)) {
            return static::parseArrayString($value);
        }

        // This will cast integers, floats, and booleans to their respective types
        // Still working on a way to handle multidimensional arrays and objects
        return json_decode($value) ?? $value;
    }

    protected static function parseArrayString(string $string): array
    {
        $array = [];

        // Trim input string
        $string = trim($string);

        // Check if string is an array
        if (! static::isValueArrayString($string)) {
            throw new RuntimeException('Failed parsing BladeMatter array. Input string must follow array syntax.');
        }

        // Check if string is multidimensional (not yet supported)
        if (substr_count($string, '[') > 1 || substr_count($string, ']') > 1) {
            throw new RuntimeException('Failed parsing BladeMatter array. Multidimensional arrays are not supported yet.');
        }

        // Remove opening and closing brackets
        $string = substr($string, 1, strlen($string) - 2);

        // Tokenize string between commas
        $tokens = explode(',', $string);

        // Parse each token
        foreach ($tokens as $entry) {
            // Split string into key/value pairs
            $pair = explode('=>', $entry);

            // Add key/value pair to array
            $array[static::getValueWithType(trim(trim($pair[0]), "'"))] = static::getValueWithType(trim(trim($pair[1]), "'"));
        }

        return $array;
    }

    protected static function isValueArrayString(string $string): bool
    {
        return str_starts_with($string, '[') && str_ends_with($string, ']');
    }
}