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ThenAsNow | 3 years ago

> The most horrific thing I discovered about tcl is that curly braces within comments can affect flow control.

This is not true. Once Tcl sees a valid comment, the rest of the line up to the newline is treated as a comment. An odd number of trailing backslashes suppress the newline for interpretation purposes. Within the comment you can use braces or whatever without affecting control flow.

See: https://wiki.tcl-lang.org/page/comment

discuss

order

Treblemaker|3 years ago

Yes, according to the documentation, braces in comments should be ignored.

However, the parser is confused by unbalanced braces in comments.

Here's a classic case that turns up occasionally during development:

  proc asdf { args } {
    # if { first draft complex condition } {
    if { final simplified condition } {
      do something
    } else {
      do something else
    }
  }
Sourcing a file with the above comment inside the proc will produce:

  missing close-brace: possible unbalanced brace in comment