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Using Laravel for Advanced String Manipulation in PHP

Solution: Parsing Blade Echos

Explore how to enhance a Laravel Blade directive validator to parse Blade echo tags correctly. Learn to extract dynamic content between curly braces while handling nested strings, ensuring accurate template parsing in Blade views.

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Problem statement

Our validator parser currently only handles Blade directives. How might you refactor this parser to be able to parse Blade echos, such as {{ $title }}?

Solution

The simplest implementation to extract all regions between a pair of curly braces would be the following:

PHP
<?php
class BladeEchoCursor extends AbstractStringCursor
{
    public function accept(string $current, ?string $prev = null, ?string $next = null): ?bool
    {
        if ($current == '}' && $prev == '}') {
            return $this->break();
        }
        return $this->continue();
    }
}

We can use our new implementation like so:

PHP
<?php
$input = <<<'BLADE'
Hello, {{ $name }}! The time is {{ now() }}.
BLADE;
$string = new Utf8StringIterator($input);
$echos = [];
foreach ($string as $char) {
    if ($char == '{') {
        $cursor = new BladeEchoCursor($string);
        $echos[] = $cursor->traverse();
        continue;
    }
}

This would result in output similar to the following:

array [
  0 => CursorResult {
    startPosition: 7
    endPosition: 17
    length: 11
    value: "{{ $name }}"
...