This article is about a little-known feature of Perl called source filters. Source filters alter the program text of a module before Perl sees it, much as a C preprocessor alters the source text of a C program before the compiler sees it. This article tells you more about what source filters are, how they work, and how to write your own. この記事は、ほとんど知られていない Perl の機能である ソースフィルタ に 関するものです。 C プリプロセッサが