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