QuackCompiler\Parser\Parser::match PHP Method

    public function match($tag)
    {
        $hint = null;
        if ($this->lookahead->getTag() === $tag) {
            return $this->consume();
        }
        // When, after an error, the programmer provided an identifier,
        // we'll calculate the levenshtein distance between the expected lexeme
        // and the provided lexeme and give a hint about
        if (Tag::T_IDENT === $this->lookahead->getTag() && array_key_exists($tag, $this->input->keywords_hash)) {
            $expected_lexeme = $this->input->keywords_hash[$tag];
            $provided_lexeme = $this->resolveScope($this->lookahead->getPointer());
            $distance = levenshtein($expected_lexeme, $provided_lexeme);
            if ($distance <= 2) {
                $hint = "Did you mean \"{$expected_lexeme}\" instead of \"{$provided_lexeme}\"?";
            }
        }
        throw new SyntaxError(['expected' => $tag, 'found' => $this->lookahead, 'parser' => $this, 'hint' => $hint]);
    }