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f61efe3fe7
Problem: calling `vim.filetype.match()` has performance bottleneck in
that it has to match a lot of Lua patterns against several versions of
input file name. This might be the problem if users need to call it
synchronously a lot of times.
Solution: add "parent pattern pre-matching" which can be used to quickly
reject several potential pattern matches at (usually rare) cost of
adding time for one extra Lua pattern match.
"Parent pattern" is a manually added/tracked grouping of filetype
patterns which should have two properties:
- Match at least the same set of strings as its filetype patterns.
But not too much more.
- Be fast to match.
For them to be effective, group should consist from at least three
filetype patterns.
Example: for a filetpye pattern ".*/etc/a2ps/.*%.cfg", both "/etc/"
and "%.cfg" are good parent patterns (prefer the one which can group
more filetype patterns).
After this commit, `vim.filetype.match()` on most inputs runs ~3.4
times faster (while some inputs may see less impact if they match
many parent patterns).
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| .. | ||
| autoload | ||
| colors | ||
| compiler | ||
| doc | ||
| ftplugin | ||
| indent | ||
| keymap | ||
| lua | ||
| macros | ||
| pack/dist/opt | ||
| plugin | ||
| queries | ||
| spell | ||
| syntax | ||
| tools | ||
| tutor | ||
| CMakeLists.txt | ||
| delmenu.vim | ||
| filetype.lua | ||
| ftoff.vim | ||
| ftplugin.vim | ||
| ftplugof.vim | ||
| indent.vim | ||
| indoff.vim | ||
| macmap.vim | ||
| makemenu.vim | ||
| menu.vim | ||
| mswin.vim | ||
| neovim.ico | ||
| nvim.appdata.xml | ||
| nvim.desktop | ||
| nvim.png | ||
| optwin.vim | ||
| synmenu.vim | ||
| windows_icon.rc | ||
