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Bug #19485

closed

Unexpected behavior in squiggly heredocs

Added by jemmai (Jemma Issroff) over 1 year ago. Updated over 1 year ago.

Status:
Closed
Assignee:
Target version:
-
[ruby-core:112744]

Description

Based on the squiggly heredoc documentation, I found the following to be unexpected behavior. Explicitly, the documentation specifies, "The indentation of the least-indented line will be removed from each line of the content."

After running:

File.write("test.rb", "p <<~EOF\n\ta\n  b\nEOF\n")

and then ruby test.rb, I get the following output:

"\ta\nb\n"

The least-indented line above is b, however, no leading whitespace is removed from the line containing \ta.

For another example:

File.write("test.rb", "p <<~EOF\n\tA\n  \tB\nEOF\n")

ruby test.rb gives:

"A\nB\n"

In this case, the \t was removed from the line containing A, but more whitespace than that ( \t) was removed from the line containing B.

After seeing the first example, I assumed that the documentation was out of date, and that I should fix it to read that \t would never be converted into space characters in order to remove leading whitespace. But after the second example, it seems like this is a bug in removing leading whitespace.

Can someone please explain what the rules should be on squiggly heredocs? I can implement a fix to adhere to the rules, or can update the documentation, I am just unsure of what the rules should be because the above two examples reflect unexpected behavior in two distinct ways.

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