diff --git a/src/Ast/AstNode.php b/src/Ast/AstNode.php
index 84f6ae9b..ec15547c 100644
--- a/src/Ast/AstNode.php
+++ b/src/Ast/AstNode.php
@@ -22,4 +22,6 @@
 interface AstNode
 {
     public function getSpan(): FileSpan;
+
+    public function __toString(): string;
 }
diff --git a/src/Ast/Css/CssValue.php b/src/Ast/Css/CssValue.php
index 7b25e05f..76e93bf0 100644
--- a/src/Ast/Css/CssValue.php
+++ b/src/Ast/Css/CssValue.php
@@ -59,4 +59,13 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        if (\is_array($this->value)) {
+            return implode($this->value);
+        }
+
+        return (string) $this->value;
+    }
 }
diff --git a/src/Ast/Css/ModifiableCssNode.php b/src/Ast/Css/ModifiableCssNode.php
index bcd9b10b..5441b792 100644
--- a/src/Ast/Css/ModifiableCssNode.php
+++ b/src/Ast/Css/ModifiableCssNode.php
@@ -12,6 +12,7 @@
 
 namespace ScssPhp\ScssPhp\Ast\Css;
 
+use ScssPhp\ScssPhp\Serializer\Serializer;
 use ScssPhp\ScssPhp\Visitor\ModifiableCssVisitor;
 
 /**
@@ -161,4 +162,9 @@ public function remove(): void
         $this->parent = null;
         $this->indexInParent = null;
     }
+
+    public function __toString(): string
+    {
+        return Serializer::serialize($this, true)->getCss();
+    }
 }
diff --git a/src/Ast/Sass/Argument.php b/src/Ast/Sass/Argument.php
index 60b8fdc4..80d4006f 100644
--- a/src/Ast/Sass/Argument.php
+++ b/src/Ast/Sass/Argument.php
@@ -70,4 +70,13 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        if ($this->defaultValue === null) {
+            return $this->name;
+        }
+
+        return $this->name . ': ' . $this->defaultValue;
+    }
 }
diff --git a/src/Ast/Sass/ArgumentDeclaration.php b/src/Ast/Sass/ArgumentDeclaration.php
index 9f70daba..b810f495 100644
--- a/src/Ast/Sass/ArgumentDeclaration.php
+++ b/src/Ast/Sass/ArgumentDeclaration.php
@@ -78,4 +78,17 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        $parts = [];
+        foreach ($this->arguments as $arg) {
+            $parts[] = "\$$arg";
+        }
+        if ($this->restArgument !== null) {
+            $parts[] = "\$$this->restArgument...";
+        }
+
+        return implode(', ', $parts);
+    }
 }
diff --git a/src/Ast/Sass/ArgumentInvocation.php b/src/Ast/Sass/ArgumentInvocation.php
index 124e47ca..3be35172 100644
--- a/src/Ast/Sass/ArgumentInvocation.php
+++ b/src/Ast/Sass/ArgumentInvocation.php
@@ -108,4 +108,20 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        $parts = $this->positional;
+        foreach ($this->named as $name => $arg) {
+            $parts[] = "\$$name: $arg";
+        }
+        if ($this->rest !== null) {
+            $parts[] = "$this->rest...";
+        }
+        if ($this->keywordRest !== null) {
+            $parts[] = "$this->keywordRest...";
+        }
+
+        return '(' . implode(', ', $parts) . ')';
+    }
 }
diff --git a/src/Ast/Sass/ConfiguredVariable.php b/src/Ast/Sass/ConfiguredVariable.php
index df747eb6..3d82bd39 100644
--- a/src/Ast/Sass/ConfiguredVariable.php
+++ b/src/Ast/Sass/ConfiguredVariable.php
@@ -78,4 +78,9 @@ public function getNameSpan(): FileSpan
     {
         return SpanUtil::initialIdentifier($this->span, 1);
     }
+
+    public function __toString(): string
+    {
+        return '$' . $this->name . ': ' . $this->expression . ($this->guarded ? ' !default' : '');
+    }
 }
diff --git a/src/Ast/Sass/Expression/BinaryOperationExpression.php b/src/Ast/Sass/Expression/BinaryOperationExpression.php
index c40806e6..e00b7cfb 100644
--- a/src/Ast/Sass/Expression/BinaryOperationExpression.php
+++ b/src/Ast/Sass/Expression/BinaryOperationExpression.php
@@ -116,4 +116,33 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitBinaryOperationExpression($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '';
+
+        $leftNeedsParens = $this->left instanceof BinaryOperationExpression && BinaryOperator::getPrecedence($this->left->getOperator()) < BinaryOperator::getPrecedence($this->operator);
+        if ($leftNeedsParens) {
+            $buffer .= '(';
+        }
+        $buffer .= $this->left;
+        if ($leftNeedsParens) {
+            $buffer .= ')';
+        }
+
+        $buffer .= ' ';
+        $buffer .= $this->operator;
+        $buffer .= ' ';
+
+        $rightNeedsParens = $this->right instanceof BinaryOperationExpression && BinaryOperator::getPrecedence($this->right->getOperator()) <= BinaryOperator::getPrecedence($this->operator);
+        if ($rightNeedsParens) {
+            $buffer .= '(';
+        }
+        $buffer .= $this->right;
+        if ($rightNeedsParens) {
+            $buffer .= ')';
+        }
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Expression/BooleanExpression.php b/src/Ast/Sass/Expression/BooleanExpression.php
index f0cedcd2..0981d3eb 100644
--- a/src/Ast/Sass/Expression/BooleanExpression.php
+++ b/src/Ast/Sass/Expression/BooleanExpression.php
@@ -55,4 +55,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitBooleanExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->value ? 'true' : 'false';
+    }
 }
diff --git a/src/Ast/Sass/Expression/CalculationExpression.php b/src/Ast/Sass/Expression/CalculationExpression.php
index 2f7cfa3b..7f5e611f 100644
--- a/src/Ast/Sass/Expression/CalculationExpression.php
+++ b/src/Ast/Sass/Expression/CalculationExpression.php
@@ -227,4 +227,9 @@ private static function verify(Expression $expression): void
 
         throw new \InvalidArgumentException('Invalid calculation argument.');
     }
+
+    public function __toString(): string
+    {
+        return $this->name . '(' . implode(', ', $this->arguments) . ')';
+    }
 }
diff --git a/src/Ast/Sass/Expression/ColorExpression.php b/src/Ast/Sass/Expression/ColorExpression.php
index 62efa4ac..dc8583ee 100644
--- a/src/Ast/Sass/Expression/ColorExpression.php
+++ b/src/Ast/Sass/Expression/ColorExpression.php
@@ -56,4 +56,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitColorExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return (string) $this->value;
+    }
 }
diff --git a/src/Ast/Sass/Expression/FunctionExpression.php b/src/Ast/Sass/Expression/FunctionExpression.php
index 3705db6d..c0a642af 100644
--- a/src/Ast/Sass/Expression/FunctionExpression.php
+++ b/src/Ast/Sass/Expression/FunctionExpression.php
@@ -125,4 +125,17 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitFunctionExpression($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '';
+
+        if ($this->namespace !== null) {
+            $buffer .= $this->namespace . '.';
+        }
+
+        $buffer .= $this->originalName . $this->arguments;
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Expression/IfExpression.php b/src/Ast/Sass/Expression/IfExpression.php
index 4dc86263..24db7eb7 100644
--- a/src/Ast/Sass/Expression/IfExpression.php
+++ b/src/Ast/Sass/Expression/IfExpression.php
@@ -63,4 +63,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitIfExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return 'if' . $this->arguments;
+    }
 }
diff --git a/src/Ast/Sass/Expression/InterpolatedFunctionExpression.php b/src/Ast/Sass/Expression/InterpolatedFunctionExpression.php
index ad022fa5..20876581 100644
--- a/src/Ast/Sass/Expression/InterpolatedFunctionExpression.php
+++ b/src/Ast/Sass/Expression/InterpolatedFunctionExpression.php
@@ -76,4 +76,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitInterpolatedFunctionExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->name . $this->arguments;
+    }
 }
diff --git a/src/Ast/Sass/Expression/ListExpression.php b/src/Ast/Sass/Expression/ListExpression.php
index 0766a3fd..053a212e 100644
--- a/src/Ast/Sass/Expression/ListExpression.php
+++ b/src/Ast/Sass/Expression/ListExpression.php
@@ -92,4 +92,51 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitListExpression($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '';
+        if ($this->hasBrackets()) {
+            $buffer .= '[';
+        }
+
+        $buffer .= implode($this->separator === ListSeparator::COMMA ? ', ' : ' ', array_map(function ($element) {
+            return $this->elementNeedsParens($element) ? "($element)" : (string) $element;
+        }, $this->contents));
+
+        if ($this->hasBrackets()) {
+            $buffer .= ']';
+        }
+
+        return $buffer;
+    }
+
+    /**
+     * Returns whether $expression, contained in $this, needs parentheses when
+     * printed as Sass source.
+     */
+    private function elementNeedsParens(Expression $expression): bool
+    {
+        if ($expression instanceof ListExpression) {
+            if (\count($expression->contents) < 2) {
+                return false;
+            }
+
+            if ($expression->brackets) {
+                return false;
+            }
+
+            return $this->separator === ListSeparator::COMMA ? $expression->separator === ListSeparator::COMMA : $expression->separator !== ListSeparator::UNDECIDED;
+        }
+
+        if ($this->separator !== ListSeparator::SPACE) {
+            return false;
+        }
+
+        if ($expression instanceof UnaryOperationExpression) {
+            return $expression->getOperator() === UnaryOperator::PLUS || $expression->getOperator() === UnaryOperator::MINUS;
+        }
+
+        return false;
+    }
 }
diff --git a/src/Ast/Sass/Expression/MapExpression.php b/src/Ast/Sass/Expression/MapExpression.php
index 5f12f870..6615f2a7 100644
--- a/src/Ast/Sass/Expression/MapExpression.php
+++ b/src/Ast/Sass/Expression/MapExpression.php
@@ -61,4 +61,11 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitMapExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return '(' . implode(', ', array_map(function ($pair) {
+            return $pair[0] . ': ' . $pair[1];
+        }, $this->pairs)) . ')';
+    }
 }
diff --git a/src/Ast/Sass/Expression/NullExpression.php b/src/Ast/Sass/Expression/NullExpression.php
index 9697cfa3..6db94f16 100644
--- a/src/Ast/Sass/Expression/NullExpression.php
+++ b/src/Ast/Sass/Expression/NullExpression.php
@@ -43,4 +43,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitNullExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return 'null';
+    }
 }
diff --git a/src/Ast/Sass/Expression/NumberExpression.php b/src/Ast/Sass/Expression/NumberExpression.php
index fb468512..9a11cfc7 100644
--- a/src/Ast/Sass/Expression/NumberExpression.php
+++ b/src/Ast/Sass/Expression/NumberExpression.php
@@ -73,4 +73,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitNumberExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->value . ($this->unit ?? '');
+    }
 }
diff --git a/src/Ast/Sass/Expression/ParenthesizedExpression.php b/src/Ast/Sass/Expression/ParenthesizedExpression.php
index dccfd4a1..6c2e7ade 100644
--- a/src/Ast/Sass/Expression/ParenthesizedExpression.php
+++ b/src/Ast/Sass/Expression/ParenthesizedExpression.php
@@ -55,4 +55,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitParenthesizedExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return '(' . $this->expression . ')';
+    }
 }
diff --git a/src/Ast/Sass/Expression/SelectorExpression.php b/src/Ast/Sass/Expression/SelectorExpression.php
index df20e79d..18ffe356 100644
--- a/src/Ast/Sass/Expression/SelectorExpression.php
+++ b/src/Ast/Sass/Expression/SelectorExpression.php
@@ -43,4 +43,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitSelectorExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return '&';
+    }
 }
diff --git a/src/Ast/Sass/Expression/StringExpression.php b/src/Ast/Sass/Expression/StringExpression.php
index 5c1bb59b..5b071f72 100644
--- a/src/Ast/Sass/Expression/StringExpression.php
+++ b/src/Ast/Sass/Expression/StringExpression.php
@@ -52,6 +52,20 @@ public static function plain(string $text, FileSpan $span, bool $quotes = false)
         return new self(new Interpolation([$text], $span), $quotes);
     }
 
+    /**
+     * Returns Sass source for a quoted string that, when evaluated, will have
+     * $text as its contents.
+     */
+    public static function quoteText(string $text): string
+    {
+        $quote = self::bestQuote([$text]);
+        $buffer = $quote;
+        $buffer .= self::quoteInnerText($text, $quote, true);
+        $buffer .= $quote;
+
+        return $buffer;
+    }
+
     public function getText(): Interpolation
     {
         return $this->text;
@@ -87,7 +101,7 @@ public function asInterpolation(bool $static = false, string $quote = null): Int
             if ($value instanceof Expression) {
                 $buffer->add($value);
             } else {
-                self::quoteInnerText($value, $quote, $buffer, $static);
+                $buffer->write(self::quoteInnerText($value, $quote, $static));
             }
         }
 
@@ -96,41 +110,43 @@ public function asInterpolation(bool $static = false, string $quote = null): Int
         return $buffer->buildInterpolation($this->text->getSpan());
     }
 
-    private static function quoteInnerText(string $value, string $quote, InterpolationBuffer $buffer, bool $static = false): void
+    private static function quoteInnerText(string $value, string $quote, bool $static = false): string
     {
+        $buffer = '';
         $length = \strlen($value);
 
         for ($i = 0; $i < $length; $i++) {
             $char = $value[$i];
 
             if (Character::isNewline($char)) {
-                $buffer->write('\\a');
+                $buffer .= '\\a';
 
                 if ($i !== $length - 1) {
                     $next = $value[$i + 1];
 
                     if (Character::isWhitespace($next) || Character::isHex($next)) {
-                        $buffer->write(' ');
+                        $buffer .= ' ';
                     }
                 }
             } else {
                 if ($char === $quote || $char === '\\' || ($static && $char === '#' && $i < $length - 1 && $value[$i + 1] === '{')) {
-                    $buffer->write('\\');
+                    $buffer .= '\\';
                 }
 
                 if (\ord($char) < 0x80) {
-                    $buffer->write($char);
+                    $buffer .= $char;
                 } else {
                     if (!preg_match('/./usA', $value, $m, 0, $i)) {
                         throw new \UnexpectedValueException('Invalid UTF-8 char');
                     }
 
-                    $buffer->write($m[0]);
+                    $buffer .= $m[0];
                     $i += \strlen($m[0]) - 1; // skip over the extra bytes that have been processed.
                 }
             }
         }
 
+        return $buffer;
     }
 
     /**
@@ -158,4 +174,9 @@ private static function bestQuote(array $parts): string
 
         return $containsDoubleQuote ? "'": '"';
     }
+
+    public function __toString(): string
+    {
+        return (string) $this->asInterpolation();
+    }
 }
diff --git a/src/Ast/Sass/Expression/UnaryOperationExpression.php b/src/Ast/Sass/Expression/UnaryOperationExpression.php
index 0890102c..ecb89043 100644
--- a/src/Ast/Sass/Expression/UnaryOperationExpression.php
+++ b/src/Ast/Sass/Expression/UnaryOperationExpression.php
@@ -73,4 +73,15 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitUnaryOperationExpression($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = $this->operator;
+        if ($this->operator === UnaryOperator::NOT) {
+            $buffer .= ' ';
+        }
+        $buffer .= $this->operand;
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Expression/ValueExpression.php b/src/Ast/Sass/Expression/ValueExpression.php
index 384bb89b..d2d6549f 100644
--- a/src/Ast/Sass/Expression/ValueExpression.php
+++ b/src/Ast/Sass/Expression/ValueExpression.php
@@ -59,4 +59,9 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitValueExpression($this);
     }
+
+    public function __toString(): string
+    {
+        return (string) $this->value;
+    }
 }
diff --git a/src/Ast/Sass/Expression/VariableExpression.php b/src/Ast/Sass/Expression/VariableExpression.php
index 8424e459..5ccb4498 100644
--- a/src/Ast/Sass/Expression/VariableExpression.php
+++ b/src/Ast/Sass/Expression/VariableExpression.php
@@ -92,4 +92,13 @@ public function accept(ExpressionVisitor $visitor)
     {
         return $visitor->visitVariableExpression($this);
     }
+
+    public function __toString(): string
+    {
+        if ($this->namespace === null) {
+            return '$' . $this->name;
+        }
+
+        return $this->namespace . '$' . $this->name;
+    }
 }
diff --git a/src/Ast/Sass/Import/DynamicImport.php b/src/Ast/Sass/Import/DynamicImport.php
index 5d53e350..ffa70b69 100644
--- a/src/Ast/Sass/Import/DynamicImport.php
+++ b/src/Ast/Sass/Import/DynamicImport.php
@@ -12,6 +12,7 @@
 
 namespace ScssPhp\ScssPhp\Ast\Sass\Import;
 
+use ScssPhp\ScssPhp\Ast\Sass\Expression\StringExpression;
 use ScssPhp\ScssPhp\Ast\Sass\Import;
 use ScssPhp\ScssPhp\SourceSpan\FileSpan;
 
@@ -53,4 +54,9 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        return StringExpression::quoteText($this->urlString);
+    }
 }
diff --git a/src/Ast/Sass/Import/StaticImport.php b/src/Ast/Sass/Import/StaticImport.php
index c36048dd..e63c65ba 100644
--- a/src/Ast/Sass/Import/StaticImport.php
+++ b/src/Ast/Sass/Import/StaticImport.php
@@ -79,4 +79,19 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        $buffer = (string) $this->url;
+
+        if ($this->supports !== null) {
+            $buffer .= " supports($this->supports)";
+        }
+
+        if ($this->media !== null) {
+            $buffer .= ' ' . $this->media;
+        }
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Interpolation.php b/src/Ast/Sass/Interpolation.php
index 38d8af91..bf2b55f0 100644
--- a/src/Ast/Sass/Interpolation.php
+++ b/src/Ast/Sass/Interpolation.php
@@ -102,4 +102,11 @@ public function getInitialPlain(): string
 
         return '';
     }
+
+    public function __toString(): string
+    {
+        return implode('', array_map(function ($value) {
+            return \is_string($value) ? $value : '#{' . $value .'}';
+        }, $this->contents));
+    }
 }
diff --git a/src/Ast/Sass/Statement/AtRootRule.php b/src/Ast/Sass/Statement/AtRootRule.php
index 09f616be..3da58c3d 100644
--- a/src/Ast/Sass/Statement/AtRootRule.php
+++ b/src/Ast/Sass/Statement/AtRootRule.php
@@ -67,4 +67,14 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitAtRootRule($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '@at-root ';
+        if ($this->query !== null) {
+            $buffer .= $this->query . ' ';
+        }
+
+        return $buffer . '{' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/AtRule.php b/src/Ast/Sass/Statement/AtRule.php
index 12d70086..d401284d 100644
--- a/src/Ast/Sass/Statement/AtRule.php
+++ b/src/Ast/Sass/Statement/AtRule.php
@@ -74,4 +74,20 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitAtRule($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '@' . $this->name;
+        if ($this->value !== null) {
+            $buffer .= ' ' . $this->value;
+        }
+
+        $children = $this->getChildren();
+
+        if ($children === null) {
+            return $buffer . ';';
+        }
+
+        return $buffer . '{' . implode(' ', $children) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ContentBlock.php b/src/Ast/Sass/Statement/ContentBlock.php
index 7c65b036..02c2e699 100644
--- a/src/Ast/Sass/Statement/ContentBlock.php
+++ b/src/Ast/Sass/Statement/ContentBlock.php
@@ -36,4 +36,11 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitContentBlock($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = $this->getArguments()->isEmpty() ? '' : ' using (' . $this->getArguments() . ')';
+
+        return $buffer . '{' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ContentRule.php b/src/Ast/Sass/Statement/ContentRule.php
index ed79a4cc..ee952263 100644
--- a/src/Ast/Sass/Statement/ContentRule.php
+++ b/src/Ast/Sass/Statement/ContentRule.php
@@ -63,4 +63,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitContentRule($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->arguments->isEmpty() ? '@content;' : "@content($this->arguments);";
+    }
 }
diff --git a/src/Ast/Sass/Statement/DebugRule.php b/src/Ast/Sass/Statement/DebugRule.php
index 142aab68..57490e8d 100644
--- a/src/Ast/Sass/Statement/DebugRule.php
+++ b/src/Ast/Sass/Statement/DebugRule.php
@@ -58,4 +58,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitDebugRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@debug ' . $this->expression . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/Declaration.php b/src/Ast/Sass/Statement/Declaration.php
index 711be0d1..d12d44ca 100644
--- a/src/Ast/Sass/Statement/Declaration.php
+++ b/src/Ast/Sass/Statement/Declaration.php
@@ -120,4 +120,24 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitDeclaration($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = $this->name . ':';
+
+        if ($this->value !== null) {
+            if (!$this->isCustomProperty()) {
+                $buffer .= ' ';
+            }
+            $buffer .= $this->value;
+        }
+
+        $children = $this->getChildren();
+
+        if ($children === null) {
+            return $buffer . ';';
+        }
+
+        return $buffer . '{' . implode(' ', $children) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/EachRule.php b/src/Ast/Sass/Statement/EachRule.php
index 9798f09f..3771812d 100644
--- a/src/Ast/Sass/Statement/EachRule.php
+++ b/src/Ast/Sass/Statement/EachRule.php
@@ -80,4 +80,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitEachRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@each ' . implode(', ', array_map(function ($variable) { return '$' . $variable; }, $this->variables)) . ' in ' . $this->list . ' {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ElseClause.php b/src/Ast/Sass/Statement/ElseClause.php
index da176e5b..8ced96ed 100644
--- a/src/Ast/Sass/Statement/ElseClause.php
+++ b/src/Ast/Sass/Statement/ElseClause.php
@@ -19,4 +19,8 @@
  */
 final class ElseClause extends IfRuleClause
 {
+    public function __toString(): string
+    {
+        return '@else {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ErrorRule.php b/src/Ast/Sass/Statement/ErrorRule.php
index aed8827e..8dcf4d16 100644
--- a/src/Ast/Sass/Statement/ErrorRule.php
+++ b/src/Ast/Sass/Statement/ErrorRule.php
@@ -58,4 +58,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitErrorRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@error ' . $this->expression . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ExtendRule.php b/src/Ast/Sass/Statement/ExtendRule.php
index 6b72bdc8..323dab29 100644
--- a/src/Ast/Sass/Statement/ExtendRule.php
+++ b/src/Ast/Sass/Statement/ExtendRule.php
@@ -76,4 +76,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitExtendRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@extend ' . $this->selector . ($this->optional ? ' !optional' : '') . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/ForRule.php b/src/Ast/Sass/Statement/ForRule.php
index 20a6ef56..2480e1f3 100644
--- a/src/Ast/Sass/Statement/ForRule.php
+++ b/src/Ast/Sass/Statement/ForRule.php
@@ -103,4 +103,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitForRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@for $' . $this->variable . ' from ' . $this->from . ($this->exclusive ? ' to ' : ' through ') . $this->to . '{' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/FunctionRule.php b/src/Ast/Sass/Statement/FunctionRule.php
index 4a958a4e..c872828f 100644
--- a/src/Ast/Sass/Statement/FunctionRule.php
+++ b/src/Ast/Sass/Statement/FunctionRule.php
@@ -35,4 +35,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitFunctionRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@function ' . $this->getName() . '(' . $this->getArguments() . ') {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/IfRule.php b/src/Ast/Sass/Statement/IfRule.php
index 12fa66af..1525694b 100644
--- a/src/Ast/Sass/Statement/IfRule.php
+++ b/src/Ast/Sass/Statement/IfRule.php
@@ -88,4 +88,19 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitIfRule($this);
     }
+
+    public function __toString(): string
+    {
+        $parts = [];
+
+        foreach ($this->clauses as $index => $clause) {
+            $parts[] = ($index === 0 ? '@if ' : '@else if ') . $clause->getExpression() . '{' . implode(' ', $clause->getChildren()) . '}';
+        }
+
+        if ($this->lastClause !== null) {
+            $parts[] = $this->lastClause;
+        }
+
+        return implode(' ', $parts);
+    }
 }
diff --git a/src/Ast/Sass/Statement/ImportRule.php b/src/Ast/Sass/Statement/ImportRule.php
index 42fc59a5..99e5277e 100644
--- a/src/Ast/Sass/Statement/ImportRule.php
+++ b/src/Ast/Sass/Statement/ImportRule.php
@@ -62,4 +62,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitImportRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@import ' . implode(', ', $this->imports) . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/IncludeRule.php b/src/Ast/Sass/Statement/IncludeRule.php
index 74926c48..bb815b34 100644
--- a/src/Ast/Sass/Statement/IncludeRule.php
+++ b/src/Ast/Sass/Statement/IncludeRule.php
@@ -119,4 +119,22 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitIncludeRule($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '@include ';
+
+        if ($this->namespace !== null) {
+            $buffer .= $this->namespace . '.';
+        }
+        $buffer .= $this->name;
+
+        if (!$this->arguments->isEmpty()) {
+            $buffer .= "($this->arguments)";
+        }
+
+        $buffer .= $this->content === null ? ';' : ' ' . $this->content;
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Statement/LoudComment.php b/src/Ast/Sass/Statement/LoudComment.php
index 074e6fbe..743d9b1d 100644
--- a/src/Ast/Sass/Statement/LoudComment.php
+++ b/src/Ast/Sass/Statement/LoudComment.php
@@ -49,4 +49,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitLoudComment($this);
     }
+
+    public function __toString(): string
+    {
+        return (string) $this->text;
+    }
 }
diff --git a/src/Ast/Sass/Statement/MediaRule.php b/src/Ast/Sass/Statement/MediaRule.php
index 967e2996..f8467673 100644
--- a/src/Ast/Sass/Statement/MediaRule.php
+++ b/src/Ast/Sass/Statement/MediaRule.php
@@ -67,4 +67,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitMediaRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@media ' . $this->query . ' {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/MixinRule.php b/src/Ast/Sass/Statement/MixinRule.php
index e4d110a5..ec6ddda7 100644
--- a/src/Ast/Sass/Statement/MixinRule.php
+++ b/src/Ast/Sass/Statement/MixinRule.php
@@ -65,4 +65,17 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitMixinRule($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '@mixin ' . $this->getName();
+
+        if (!$this->getArguments()->isEmpty()) {
+            $buffer .= "({$this->getArguments()})";
+        }
+
+        $buffer .= ' {' . implode(' ', $this->getChildren()) . '}';
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Statement/ReturnRule.php b/src/Ast/Sass/Statement/ReturnRule.php
index ed80ea21..3a2ee76c 100644
--- a/src/Ast/Sass/Statement/ReturnRule.php
+++ b/src/Ast/Sass/Statement/ReturnRule.php
@@ -58,4 +58,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitReturnRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@return ' . $this->expression . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/SilentComment.php b/src/Ast/Sass/Statement/SilentComment.php
index 532e12a7..ec6f1af8 100644
--- a/src/Ast/Sass/Statement/SilentComment.php
+++ b/src/Ast/Sass/Statement/SilentComment.php
@@ -55,4 +55,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitSilentComment($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->text;
+    }
 }
diff --git a/src/Ast/Sass/Statement/StyleRule.php b/src/Ast/Sass/Statement/StyleRule.php
index 7d5f7540..aec02deb 100644
--- a/src/Ast/Sass/Statement/StyleRule.php
+++ b/src/Ast/Sass/Statement/StyleRule.php
@@ -69,4 +69,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitStyleRule($this);
     }
+
+    public function __toString(): string
+    {
+        return $this->selector . ' {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/Stylesheet.php b/src/Ast/Sass/Statement/Stylesheet.php
index 97ff5677..95196d4a 100644
--- a/src/Ast/Sass/Statement/Stylesheet.php
+++ b/src/Ast/Sass/Statement/Stylesheet.php
@@ -118,4 +118,9 @@ public static function parseCss(string $contents, ?LoggerInterface $logger = nul
     {
         return (new CssParser($contents, $logger, $sourceUrl))->parse();
     }
+
+    public function __toString(): string
+    {
+        return implode(' ', $this->getChildren());
+    }
 }
diff --git a/src/Ast/Sass/Statement/SupportsRule.php b/src/Ast/Sass/Statement/SupportsRule.php
index c3d9f3ee..cfac6bde 100644
--- a/src/Ast/Sass/Statement/SupportsRule.php
+++ b/src/Ast/Sass/Statement/SupportsRule.php
@@ -62,4 +62,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitSupportsRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@supports ' . $this->condition . ' {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/Statement/VariableDeclaration.php b/src/Ast/Sass/Statement/VariableDeclaration.php
index d7d67eb3..e8d283fd 100644
--- a/src/Ast/Sass/Statement/VariableDeclaration.php
+++ b/src/Ast/Sass/Statement/VariableDeclaration.php
@@ -147,4 +147,15 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitVariableDeclaration($this);
     }
+
+    public function __toString(): string
+    {
+        $buffer = '';
+        if ($this->namespace !== null) {
+            $buffer .= $this->namespace . '.';
+        }
+        $buffer .= "\$$this->name: $this->expression;";
+
+        return $buffer;
+    }
 }
diff --git a/src/Ast/Sass/Statement/WarnRule.php b/src/Ast/Sass/Statement/WarnRule.php
index 3bfc2d2e..ac0501c1 100644
--- a/src/Ast/Sass/Statement/WarnRule.php
+++ b/src/Ast/Sass/Statement/WarnRule.php
@@ -58,4 +58,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitWarnRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@warn ' . $this->expression . ';';
+    }
 }
diff --git a/src/Ast/Sass/Statement/WhileRule.php b/src/Ast/Sass/Statement/WhileRule.php
index 82efc1ec..e4cb376d 100644
--- a/src/Ast/Sass/Statement/WhileRule.php
+++ b/src/Ast/Sass/Statement/WhileRule.php
@@ -65,4 +65,9 @@ public function accept(StatementVisitor $visitor)
     {
         return $visitor->visitWhileRule($this);
     }
+
+    public function __toString(): string
+    {
+        return '@while ' . $this->condition . ' {' . implode(' ', $this->getChildren()) . '}';
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsAnything.php b/src/Ast/Sass/SupportsCondition/SupportsAnything.php
index 53060132..1cacca39 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsAnything.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsAnything.php
@@ -53,4 +53,9 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        return "($this->contents)";
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsDeclaration.php b/src/Ast/Sass/SupportsCondition/SupportsDeclaration.php
index 95694817..46ca4a36 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsDeclaration.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsDeclaration.php
@@ -83,4 +83,9 @@ public function isCustomProperty(): bool
     {
         return $this->name instanceof StringExpression && !$this->name->hasQuotes() && StringUtil::startsWith($this->name->getText()->getInitialPlain(), '--');
     }
+
+    public function __toString(): string
+    {
+        return "($this->name: $this->value)";
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsFunction.php b/src/Ast/Sass/SupportsCondition/SupportsFunction.php
index 058d866c..b22c238e 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsFunction.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsFunction.php
@@ -66,4 +66,9 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        return "$this->name($this->arguments)";
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsInterpolation.php b/src/Ast/Sass/SupportsCondition/SupportsInterpolation.php
index 75f425ca..7cc832a8 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsInterpolation.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsInterpolation.php
@@ -52,4 +52,9 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        return '#{' . $this->expression . '}';
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsNegation.php b/src/Ast/Sass/SupportsCondition/SupportsNegation.php
index 4f131bb5..eec20e68 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsNegation.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsNegation.php
@@ -51,4 +51,13 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        if ($this->condition instanceof SupportsNegation || $this->condition instanceof SupportsOperation) {
+            return "not ($this->condition)";
+        }
+
+        return 'not ' . $this->condition;
+    }
 }
diff --git a/src/Ast/Sass/SupportsCondition/SupportsOperation.php b/src/Ast/Sass/SupportsCondition/SupportsOperation.php
index a337e3cf..11425b23 100644
--- a/src/Ast/Sass/SupportsCondition/SupportsOperation.php
+++ b/src/Ast/Sass/SupportsCondition/SupportsOperation.php
@@ -77,4 +77,18 @@ public function getSpan(): FileSpan
     {
         return $this->span;
     }
+
+    public function __toString(): string
+    {
+        return $this->parenthesize($this->left) . ' ' . $this->operator . ' ' . $this->parenthesize($this->right);
+    }
+
+    private function parenthesize(SupportsCondition $condition): string
+    {
+        if ($condition instanceof SupportsNegation || $condition instanceof SupportsOperation && $condition->operator === $this->operator) {
+            return "($condition)";
+        }
+
+        return (string) $condition;
+    }
 }