sbt/scripted-sbt-redux
Ethan Atkins 60b1ac7ac4 Improve multi parser performance
The multi parser had very poor performance if there were many commands.
Evaluating the expansion of something like "compile;" * 30 could cause
sbt to hang indefinitely. I believe this was due to excessive
backtracking due to the optional `(parser <~ semi.?).?` part of the
parser in the non-leading semicolon case.

I also reworked the implementation so that the multi command now has a
name. This allows us to partition the commands into multi and non-multi
commands more easily in State while still having multi in the command
list. With this change, builds and plugins can exclude the multi parser
if they wish.

Using the partitioned parsers, I removed the high/priority low priority
distinction. Instead, I made it so that the multi command will actually
check if the first command is a named command, like '~'. If it is, it
will pass the raw command argument with the named command stripped out
into the parser for the named command. If that is parseable, then we
directly apply the effect. Otherwise we prefix each multi command to the
state.
2019-06-25 13:45:09 -07:00
..
src/main/scala/sbt/scriptedtest Improve multi parser performance 2019-06-25 13:45:09 -07:00
NOTICE create scripted-sbt-redux 2018-07-10 03:13:47 -04:00