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<?php

declare(strict_types=1);

namespace CuyZ\Valinor\Compiler;

use function str_repeat;
use function str_replace;

/** @internal */
final class Compiler
{
    private string $code = '';

/** @var non-negative-int */
    private int $indentation = 0;

public function compile(Node ...$nodes): self
    {
        $compiler = $this;

while ($current = array_shift($nodes)) {
            $compiler = $current->compile($compiler);

if ($nodes !== []) {
                $compiler = $compiler->write("\n");
            }
        }

return $compiler;
    }

public function sub(): self
    {
        return new self();
    }

public function write(string $code): self
    {
        $self = clone $this;
        $self->code .= $code;

return $self;
    }

public function indent(): self
    {
        $self = clone $this;
        $self->indentation++;

return $self;
    }

public function code(): string
    {
        $indent = str_repeat('    ', $this->indentation);

return  $indent . str_replace("\n", "\n" . $indent, $this->code);
    }
}