#!/bin/sh
cat << "EOF"
Here is some text, embedded
"right in the middle"
of my Bourne shell script.
EOF
Having been a standard feature in the Unix shells for decades, this language structure is supported in many newer languages, such as Ruby. Python, PHP and Perl. But not Java. In Java, this program would look like:System.out.println("Here is some text, embedded\n" +
" \"right in the middle\"\n" +
"of my Java program.\n");
As you can see, the quoting and escaping required to reproduce this text is pretty ugly.Wouldn't it be nice if we could do this kind of thing in Java too? It would be great for things like XML and Unit Tests. How did we get to 2010 without having this as a standard language feature? Has it ever come up in a JSR? I haven't had much luck in digging up any information (the term "here document" is remarkably hard to search on.) If you know something about this, please leave a comment.
C# has support for string literals (see here: msdn.microsoft.com/en-us/library/aa691090%28VS.71%29.aspx).
ReplyDeleteSo, it shouldn't be a big deal to port into Java.
These literals work mostly OK apart from when you have double-quote characters. Then you have to escape them as "".
So, your example above would become:
Console.Out.WriteLine(@"Here is some text, embedded
""right in the middle""
of my C# program.
");
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ReplyDeleteI'm writing a program that needs to glue together chunks of pre-specified HTML, with the way it glues them together depending on a state variable. If Java had a JSP (Java Server Pages) compiler that could translate JSP notation to Java, then I could write each chunk as a separate JSP file, compile it to a class or method, and refer to that in my glueing code. That would be almost as good as here-documents: perhaps better, because the glueing code wouldn't get clogged up with large pieces of verbatim text.
ReplyDeleteSo I suggest that a stand-alone JSP-to-Java compiler would be a good substitute for Java here-documents.
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ReplyDeleteIt would be great for things like XML and Unit Tests.
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ReplyDeleteIt would be great for things like XML and Unit Tests.
ReplyDeleteIt would be great for things like XML and Unit Tests. How did we get to 2010 without having this as a standard language feature?
ReplyDeleteThis language structure is supported in many newer languages, such as Ruby. Python, PHP and Perl.
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ReplyDelete