Improve parsing of numbers and C-style for loops #55
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added 4 commits
July 30, 2019 11:52
Previously, numbers were just parsed as words. This improves the accuracy of the grammar, and more importantly, avoids parsing # as the start of a comment when a custom base is specified via BASE#NUMBER.
Previously, `i=0` as the first statement in a C-style for loop was parsed as a word.
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@nathansobo @maxbrunsfeld anything I can do to help this over the finish line? :) |
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Refs atom/language-shellscript#148
I'm doing a couple different changes in a single PR since they would conflict if done independently.
The first is a fix for the linked issue that improves parsing of numeric literals. We previously parsed numbers as words, but this excluded a support for numbers with a custom base, as described here. The tl;dr – You can express a number in the form
BASE#NUMBERif you want to express a base other than decimal, up to base 64. TheNUMBERportion can include letters, numbers,@and_to express various digits.The second fix adjusts C-style for loops to expect a variable assignment as the first statement inside the loop parens.
The linked issue includes another problem with arithmetic expansion and evaluation
$((...))and((...)). I will follow up with some fixes for those in this PR before requesting review.