* Added support for for-from loop, see #3832
* for-from: remove extra newline and add support for ranges
* for-from: tidy up the lexer
* for-from: add support for patterns
* for-from: fix bad alignment
* for-from: add two more tests
* for-from: fix test "for-from loops over generators"
See explanation here: https://github.com/jashkenas/coffeescript/pull/4306#issuecomment-257066877
* for-from: delete leftover console.log
* Refactor the big `if` block in the lexer to be as minimal a change from `master` as we can get away with
* Cleanup to make more idiomatic, remove trailing whitespace, minor performance improvements
* for-from: move code from one file to another
* for-from: clean up whitespace
* for-from: lexer bikeshedding
* Move "own is not supported in for-from loops" test into error_messages.coffee; improve error message so that "own" is underlined
* Revert unnecessary changes, to minimize the lines of code modified by this PR
This prevents mixing spaces and tabs in the same ‘block’ of code.
Mixing is still allowed if each line uses the same mix and if the indentation level returns to 0.
This breaks the literate coffeescript test that mixes spaces and tabs.
It is possible to match only valid JavaScript identifiers with a really long
regex (like coco and CoffeeScriptRedux does), but CoffeeScript uses a much
simpler one, which allows a bit too much.
Quoting jashkenas/coffeescript#1718 #issuecomment-2152464 @jashkenas:
> But it still seems very much across the "worth it" line. You'll get the
> SyntaxError as soon as it hits JS, and performance aside -- even the increase
> in filesize for our browser coffee-script.js lib seems too much, considering
> this is something no one ever does, apart from experimentation.
In short, CoffeeScript treats any non-ASCII character as part of an identifier.
However, unicode spaces should be excluded since having blank characters as part
of a _word_ is very confusing. This commit does so, while still keeping the
regex really simple.
* Supplement missing block before `ELSE` token only for multi-line `if`.
* Don't prematurely remove `TERMINATOR` before `ELSE` (so we can differentiate single- and multi-line forms).
* Cleanup: Remove `WHEN` from `EXPRESSION_CLOSE`. (Only `LEADING_WHEN` tokens are preceded by a `TERMINATOR`.)
* Cleanup: Remove really old, inapplicable text from comment.
