WP_URL_Pattern_Prefixer::prefix_path_pattern( string $path_pattern, string $context = 'home' ): string

64	public function prefix_path_pattern( string $path_pattern, string $context = 'home' ): string {65		// If context path does not exist, the context is invalid.66		if ( ! isset( $this->contexts[ $context ] ) ) {67			_doing_it_wrong(68				__FUNCTION__,69				esc_html(70					sprintf(71						/* translators: %s: context string */72						__( 'Invalid URL pattern context %s.' ),73						$context74					)75				),76				'6.8.0'77			);78			return $path_pattern;79		}80 81		/*82		 * In the event that the context path contains a :, ? or # (which can cause the URL pattern parser to switch to83		 * another state, though only the latter two should be percent encoded anyway), it additionally needs to be84		 * enclosed in grouping braces. The final forward slash (trailingslashit ensures there is one) affects the85		 * meaning of the * wildcard, so is left outside the braces.86		 */87		$context_path         = $this->contexts[ $context ];88		$escaped_context_path = $context_path;89		if ( strcspn( $context_path, ':?#' ) !== strlen( $context_path ) ) {90			$escaped_context_path = '{' . substr( $context_path, 0, -1 ) . '}/';91		}92 93		/*94		 * If the path already starts with the context path (including '/'), remove it first95		 * since it is about to be added back.96		 */97		if ( str_starts_with( $path_pattern, $context_path ) ) {98			$path_pattern = substr( $path_pattern, strlen( $context_path ) );99		}100 101		return $escaped_context_path . ltrim( $path_pattern, '/' );102	}