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local files = require 'files'
local util = require 'utility'
local function splitRows(text)
local rows = {}
for line in util.eachLine(text, true) do
rows[#rows+1] = line
end
return rows
end
local function getLeft(text, char)
if not text then
return ''
end
local left
local length = util.utf8Len(text)
if char == 0 then
left = ''
elseif char >= length then
left = text
else
left = text:sub(1, utf8.offset(text, char + 1) - 1)
end
return left
end
local function getRight(text, char)
if not text then
return ''
end
local right
local length = util.utf8Len(text)
if char == 0 then
right = text
elseif char >= length then
right = ''
else
right = text:sub(utf8.offset(text, char + 1))
end
return right
end
local function mergeRows(rows, change)
local startLine = change.range['start'].line + 1
local startChar = change.range['start'].character
local endLine = change.range['end'].line + 1
local endChar = change.range['end'].character
local insertRows = splitRows(change.text)
local newEndLine = startLine + #insertRows - 1
local left = getLeft(rows[startLine], startChar)
local right = getRight(rows[endLine], endChar)
-- 先把双方的行数调整成一致
if endLine > #rows then
log.error('NMD, WSM `endLine > #rows` ?')
for i = #rows + 1, endLine do
rows[i] = ''
end
end
local delta = #insertRows - (endLine - startLine + 1)
if delta ~= 0 then
table.move(rows, endLine, #rows, endLine + delta)
-- 如果行数变少了，要清除多余的行
if delta < 0 then
for i = #rows, #rows + delta + 1, -1 do
rows[i] = nil
end
end
end
-- 先处理第一行和最后一行
if startLine == newEndLine then
rows[startLine] = left .. insertRows[1] .. right
else
rows[startLine] = left .. insertRows[1]
rows[newEndLine] = insertRows[#insertRows] .. right
end
-- 修改中间的每一行
for i = 2, #insertRows - 1 do
local currentLine = startLine + i - 1
local insertText = insertRows[i] or ''
rows[currentLine] = insertText
end
end
return function (uri, changes)
local text
for _, change in ipairs(changes) do
if change.range then
local rows = files.getCachedRows(uri)
if not rows then
text = text or files.getOriginText(uri) or ''
rows = splitRows(text)
end
mergeRows(rows, change)
files.setCachedRows(uri, rows)
else
files.setCachedRows(uri, nil)
text = change.text
end
end
local rows = files.getCachedRows(uri)
if rows then
text = table.concat(rows)
end
return text
end
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