printer

package main

import (
	"bytes"
	"os"

	"github.com/z7zmey/php-parser/node"
	"github.com/z7zmey/php-parser/node/name"
	"github.com/z7zmey/php-parser/node/stmt"
	"github.com/z7zmey/php-parser/php7"
	"github.com/z7zmey/php-parser/printer"
)

func main() {
	src := `<?php

namespace Foo;

abstract class Bar extends Baz
{
    public function greet()
    {
        echo "Hello";
        // some comment
    }
}
	`

	// parse

	php7parser := php7.NewParser(bytes.NewBufferString(src), "test.php")
	php7parser.WithFreeFloating()
	php7parser.Parse()

	rootNode := php7parser.GetRootNode()

	// change namespace

	parts := &rootNode.(*node.Root).Stmts[0].(*stmt.Namespace).NamespaceName.(*name.Name).Parts
	*parts = append(*parts, &name.NamePart{Value: "Quuz"})

	// print

	p := printer.NewPrinter(os.Stdout)
	p.Print(rootNode)

}

Output:

<?php

namespace Foo\Quuz;

abstract class Bar extends Baz
{
    public function greet()
    {
        echo "Hello";
        // some comment
    }
}