5 Commits

Author	SHA1	Message	Date
Calvin Rose	96513665d6	Address #641 - add undef combinator. ... The (undef rule :tag) combinator lets a user "scope" tagged captures. After the rule has matched, all captures with tag :tag can no longer be refered to by their tag. However, such captures from outside rule are kept as is. If no tag is given, all tagged captures from rule are unreferenced. Note that this doesn't `drop` the captures, merely removes their association with the tag. This means subsequent calls to `backref` and `backmatch` will no longer "see" these tagged captures.	2021-02-26 17:25:09 -06:00
Calvin Rose	742469a8bc	Address #640. ... Allow for a zero length match at the end of a string when using the to or thru combinators.	2021-02-19 16:10:03 -06:00
Calvin Rose	776ce586bc	Add line and column combinators to peg. ... These capture the line and column number of the current position in the matched text. This is useful for error reporting as well as indentation checking. This works by lazily creating an index on first use that stores all newline character indices in order. We can then do a binary search on this to get both line number and column number in log(n) time. This is good enough for most use cases and doesn't slow down the common case at all - these will not be commonly used patterns in a hot loop so it is not worth to try and optimize this at all. Constant time look up should be possible but at the cost of complicating code and slowing down all matching to check for new lines.	2020-11-26 18:32:56 -06:00
Calvin Rose	45feb55483	Add integer parsing to pegs.	2020-09-27 12:19:00 -05:00
Calvin Rose	2598123140	Rename test suites such that it is easier to add more of them.	2020-08-07 15:34:13 -05:00