Using PHP-parser for wordpress (using composer)

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PHP

WordPress

I don't mind learning what I need to but I mainly want to know if I misunderstand and am wasting my time.

I want to use GitHub - nikic/PHP-Parser: A PHP parser written in PHP to process WordPress to analyze WordPress. The documentation at PHP-Parser/2_Usage_of_basic_components.markdown at master · nikic/PHP-Parser · GitHub shows use of Composer.

As best as I understand, to use Composer, I must install WordPress using Composer and I must do that to use PHP-Parser to process WordPress. Do I understand properly?

What I have tried:

I have read the documentation as stated. I have also found many articles about using Composer with WordPress and everything I have found indicates that if I want to use Composer with WordPress then I must install WordPress using Composer.