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feat: add vim.str_utf_{start,end} (#16129)

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vim.str_utf_{start,end} return the offset from the current position to
the start and end of the current utf-character (nearest codepoint)
respectively.
This commit is contained in:
Michael Lingelbach
2021-10-30 10:30:40 -07:00
committed by GitHub
parent 97ae0ab4d8
commit 2230b578d1
3 changed files with 104 additions and 0 deletions
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25
test/functional/lua/vim_spec.lua
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@@ -179,6 +179,31 @@ describe('lua stdlib', function()
end
end)
it("vim.str_utf_start", function()
exec_lua([[_G.test_text = "xy åäö ɧ 汉语 ↥ 🤦x🦄 å بِيَّ"]])
local expected_positions = {0,0,0,0,-1,0,-1,0,-1,0,0,-1,0,0,-1,-2,0,-1,-2,0,0,-1,-2,0,0,-1,-2,-3,0,0,-1,-2,-3,0,0,0,-1,0,0,-1,0,-1,0,-1,0,-1,0,-1}
eq(expected_positions, exec_lua([[
local start_codepoint_positions = {}
for idx = 1, #_G.test_text do
table.insert(start_codepoint_positions, vim.str_utf_start(_G.test_text, idx))
end
return start_codepoint_positions
]]))
end)
it("vim.str_utf_end", function()
exec_lua([[_G.test_text = "xy åäö ɧ 汉语 ↥ 🤦x🦄 å بِيَّ"]])
local expected_positions = {0,0,0,1,0,1,0,1,0,0,1,0,0,2,1,0,2,1,0,0,2,1,0,0,3,2,1,0,0,3,2,1,0,0,0,1,0,0,1,0,1,0,1,0,1,0,1,0 }
eq(expected_positions, exec_lua([[
local end_codepoint_positions = {}
for idx = 1, #_G.test_text do
table.insert(end_codepoint_positions, vim.str_utf_end(_G.test_text, idx))
end
return end_codepoint_positions
]]))
end)
it("vim.str_utf_pos", function()
exec_lua([[_G.test_text = "xy åäö ɧ 汉语 ↥ 🤦x🦄 å بِيَّ"]])
local expected_positions = { 1,2,3,4,6,8,10,11,13,14,17,20,21,24,25,29,30,34,35,36,38,39,41,43,45,47 }