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|
local api = vim.api
local M = {}
---@class Range2
---@field [1] integer start row
---@field [2] integer end row
---@class Range4
---@field [1] integer start row
---@field [2] integer start column
---@field [3] integer end row
---@field [4] integer end column
---@class Range6
---@field [1] integer start row
---@field [2] integer start column
---@field [3] integer start bytes
---@field [4] integer end row
---@field [5] integer end column
---@field [6] integer end bytes
---@alias Range Range2|Range4|Range6
---@private
---@param a_row integer
---@param a_col integer
---@param b_row integer
---@param b_col integer
---@return integer
--- 1: a > b
--- 0: a == b
--- -1: a < b
local function cmp_pos(a_row, a_col, b_row, b_col)
if a_row == b_row then
if a_col > b_col then
return 1
elseif a_col < b_col then
return -1
else
return 0
end
elseif a_row > b_row then
return 1
end
return -1
end
M.cmp_pos = {
lt = function(...)
return cmp_pos(...) == -1
end,
le = function(...)
return cmp_pos(...) ~= 1
end,
gt = function(...)
return cmp_pos(...) == 1
end,
ge = function(...)
return cmp_pos(...) ~= -1
end,
eq = function(...)
return cmp_pos(...) == 0
end,
ne = function(...)
return cmp_pos(...) ~= 0
end,
}
setmetatable(M.cmp_pos, { __call = cmp_pos })
---@private
---Check if a variable is a valid range object
---@param r any
---@return boolean
function M.validate(r)
if type(r) ~= 'table' or #r ~= 6 and #r ~= 4 then
return false
end
for _, e in
ipairs(r --[[@as any[] ]])
do
if type(e) ~= 'number' then
return false
end
end
return true
end
---@private
---@param r1 Range
---@param r2 Range
---@return boolean
function M.intercepts(r1, r2)
local srow_1, scol_1, erow_1, ecol_1 = M.unpack4(r1)
local srow_2, scol_2, erow_2, ecol_2 = M.unpack4(r2)
-- r1 is above r2
if M.cmp_pos.le(erow_1, ecol_1, srow_2, scol_2) then
return false
end
-- r1 is below r2
if M.cmp_pos.ge(srow_1, scol_1, erow_2, ecol_2) then
return false
end
return true
end
---@private
---@param r Range
---@return integer, integer, integer, integer
function M.unpack4(r)
if #r == 2 then
return r[1], 0, r[2], 0
end
local off_1 = #r == 6 and 1 or 0
return r[1], r[2], r[3 + off_1], r[4 + off_1]
end
---@private
---@param r Range6
---@return integer, integer, integer, integer, integer, integer
function M.unpack6(r)
return r[1], r[2], r[3], r[4], r[5], r[6]
end
---@private
---@param r1 Range
---@param r2 Range
---@return boolean whether r1 contains r2
function M.contains(r1, r2)
local srow_1, scol_1, erow_1, ecol_1 = M.unpack4(r1)
local srow_2, scol_2, erow_2, ecol_2 = M.unpack4(r2)
-- start doesn't fit
if M.cmp_pos.gt(srow_1, scol_1, srow_2, scol_2) then
return false
end
-- end doesn't fit
if M.cmp_pos.lt(erow_1, ecol_1, erow_2, ecol_2) then
return false
end
return true
end
--- @param source integer|string
--- @param index integer
--- @return integer
local function get_offset(source, index)
if index == 0 then
return 0
end
if type(source) == 'number' then
return api.nvim_buf_get_offset(source, index)
end
local byte = 0
local next_offset = source:gmatch('()\n')
local line = 1
while line <= index do
byte = next_offset() --[[@as integer]]
line = line + 1
end
return byte
end
---@private
---@param source integer|string
---@param range Range
---@return Range6
function M.add_bytes(source, range)
if type(range) == 'table' and #range == 6 then
return range --[[@as Range6]]
end
local start_row, start_col, end_row, end_col = M.unpack4(range)
-- TODO(vigoux): proper byte computation here, and account for EOL ?
local start_byte = get_offset(source, start_row) + start_col
local end_byte = get_offset(source, end_row) + end_col
return { start_row, start_col, start_byte, end_row, end_col, end_byte }
end
return M
|
