spatie / laravel-blade-x

src/Compiler.php

<?php

namespace Spatie\BladeX;

use Illuminate\Support\Str;

class Compiler
{
    /** @var \Spatie\BladeX\BladeX */
    protected $bladeX;

    public function __construct(BladeX $bladeX)
    {
        return $this->bladeX = $bladeX;

Constructors do not have meaningful return values, anything that is returned from here is discarded. Are you sure this is correct?

    }

    public function compile(string $viewContents): string
    {
        return array_reduce(
            $this->bladeX->registeredComponents(),
            [$this, 'parseComponentHtml'],
            $viewContents
        );
    }

    protected function parseComponentHtml(string $viewContents, Component $component)
    {
        $viewContents = $this->parseSlots($viewContents);

        $viewContents = $this->parseSelfClosingTags($viewContents, $component);

        $viewContents = $this->parseOpeningTags($viewContents, $component);

        $viewContents = $this->parseClosingTags($viewContents, $component);

        return $viewContents;
    }

    protected function parseSelfClosingTags(string $viewContents, Component $component): string
    {
        $pattern = "/
            <
                \s*
                {$component->getTag()}
                \s*
                (?<attributes>
                    (?:
                        \s+
                        [\w\-:.\$]+
                        (
                            =
                            (?:
                                \\\"[^\\\"]+\\\"
                                |
                                \'[^\']+\'
                                |
                                [^\'\\\"=<>]+
                            )
                        )?
                    )*
                    \s*
                )
            \/>
        /x";

        return preg_replace_callback($pattern, function (array $matches) use ($component) {
            $attributes = $this->getAttributesFromAttributeString($matches['attributes']);

            return $this->componentString($component, $attributes);
        }, $viewContents);
    }

    protected function parseOpeningTags(string $viewContents, Component $component): string
    {
        $pattern = "/
            <
                \s*
                {$component->getTag()}
                (?<attributes>
                    (?:
                        \s+
                        [\w\-:.\$]+
                        (
                            =
                            (?:
                                \\\"[^\\\"]*\\\"
                                |
                                \'[^\']*\'
                                |
                                [^\'\\\"=<>]+
                            )
                        )
                    ?)*
                    \s*
                )
                (?<![\/=\-])
            >
        /x";

        return preg_replace_callback($pattern, function (array $matches) use ($component) {
            $attributes = $this->getAttributesFromAttributeString($matches['attributes']);

            return $this->componentStartString($component, $attributes);
        }, $viewContents);
    }

    protected function parseClosingTags(string $viewContents, Component $component): string
    {
        $pattern = "/<\/\s*{$component->getTag()}\s*>/";

        return preg_replace($pattern, $this->componentEndString($component), $viewContents);
    }

    protected function componentString(Component $component, array $attributes = []): string
    {
        return $this->componentStartString($component, $attributes).$this->componentEndString($component);
    }

    protected function componentStartString(Component $component, array $attributes = []): string
    {
        $attributesString = $this->attributesToString($attributes);

        if ($component->view === 'bladex::context') {
            return " @php(app(Spatie\BladeX\ContextStack::class)->push({$attributesString})) ";
        }

        if ($component->viewModel) {
            $attributesString = "
                array_merge(
                    app(Spatie\BladeX\ContextStack::class)->read(),
                    {$attributesString},
                    app(
                        '{$component->viewModel}',
                        array_merge(
                            app(Spatie\BladeX\ContextStack::class)->read(),
                            {$attributesString}
                        )
                    )->toArray()
                )";
        }

        return " @component(
           '{$component->view}',
           array_merge(app(Spatie\BladeX\ContextStack::class)->read(),
           {$attributesString})
        ) ";
    }

    protected function componentEndString(Component $component): string
    {
        if ($component->view === 'bladex::context') {
            return "@php(app(Spatie\BladeX\ContextStack::class)->pop())";
        }

        return ' @endcomponent ';
    }

    protected function getAttributesFromAttributeString(string $attributeString): array
    {
        $attributeString = $this->parseBindAttributes($attributeString);

        $pattern = '/
            (?<attribute>[\w\-:.\$]+)
            (
                =
                (?<value>
                    (
                        \"[^\"]+\"
                        |
                        \\\'[^\\\']+\\\'
                        |
                        [^\s>]+
                    )
                )
            )?
        /x';

        if (! preg_match_all($pattern, $attributeString, $matches, PREG_SET_ORDER)) {
            return [];
        }

        $namespaces = [];
        $attributes = collect($matches)->mapWithKeys(function ($match) use (&$namespaces) {
            $attribute = Str::camel($match['attribute']);
            $value = $match['value'] ?? null;

            if (is_null($value)) {
                $value = 'true';
                $attribute = Str::start($attribute, 'bind:');
            }

            $value = $this->stripQuotes($value);

            if (Str::startsWith($attribute, 'bind:')) {
                $attribute = Str::after($attribute, 'bind:');
            } else {
                $value = str_replace("'", "\\'", $value);
                $value = "'{$value}'";

                if (Str::contains($attribute, ':')) {
                    $namespace = Str::before($attribute, ':');
                    $attribute = Str::after($attribute, ':');

                    data_set($namespaces, "{$namespace}.{$attribute}", $value);

                    return [];
                }
            }

            return [$attribute => $value];
        });

        return $attributes->merge($namespaces)->toArray();
    }

    protected function parseSlots(string $viewContents): string
    {
        $openingPattern = '/<\s*slot\s+name=(?<name>(\"[^\"]+\"|\\\'[^\\\']+\\\'|[^\s>]+))\s*>/';
        $viewContents = preg_replace_callback($openingPattern, function ($matches) {
            $name = $this->stripQuotes($matches['name']);

            return " @slot('{$name}') ";
        }, $viewContents);

        $closingPattern = '/<\/\s*slot[^>]*>/';
        $viewContents = preg_replace($closingPattern, ' @endslot', $viewContents);

        return $viewContents;
    }

    /**
     * Adds the `bind:` prefix for all bound data attributes.
     * E.g. `foo=bar :name=alex` becomes `foo=bar bind:name=alex`.
     *
     * @param string $attributeString
     *
     * @return string
     */
    protected function parseBindAttributes(string $attributeString): string
    {
        $pattern = "/
            (?:^|\s+)   # start of the string or whitespace between attributes
            :           # attribute needs to start with a semicolon
            ([\w-]+)    # match the actual attribute name
            =           # only match attributes that have a value
        /xm";

        return preg_replace($pattern, ' bind:$1=', $attributeString);
    }

    protected function attributesToString(array $attributes): string
    {
        $attributes = collect($attributes);

        $string = [];

        $plainAttributes = $attributes
            ->reject(function ($value, string $attribute) {
                return Str::startsWith($attribute, '...$');
            })
            ->map(function ($value, string $attribute) {
                if (is_array($value)) {
                    $value = $this->attributesToString($value);
                }

                return "'{$attribute}' => {$value}";
            });

        $string['plain'] = '['.$plainAttributes->implode(',').']';

        $string['spread'] = $attributes
                ->filter(function ($value, string $attribute) {
                    return Str::startsWith($attribute, '...$');
                })
                ->map(function ($value, string $attribute) {
                    $attribute = Str::after($attribute, '...');

                    return "{$attribute}";
                })
                ->implode(',');

        if (empty($string['spread'])) {
            return $string['plain'];
        }

        return 'array_merge('.$string['spread'].','.$string['plain'].')';
    }

    protected function stripQuotes(string $string): string
    {
        if (Str::startsWith($string, ['"', '\''])) {
            return substr($string, 1, -1);
        }

        return $string;
    }
}