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nvim/mason/packages/lua-language-server/libexec/script/text-merger.lua

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+local util    = require 'utility'
+local encoder = require 'encoder'
+local client  = require 'client'
+
+local offsetEncoding
+local function getOffsetEncoding()
+    if not offsetEncoding then
+        offsetEncoding = client.getOffsetEncoding():lower():gsub('%-', '')
+    end
+    return offsetEncoding
+end
+
+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 encoding = getOffsetEncoding()
+    local left
+    local length = encoder.len(encoding, text)
+
+    if char == 0 then
+        left = ''
+    elseif char >= length then
+        left = text
+    else
+        left = text:sub(1, encoder.offset(encoding, text, char + 1) - 1)
+    end
+
+    return left
+end
+
+local function getRight(text, char)
+    if not text then
+        return ''
+    end
+    local encoding = getOffsetEncoding()
+    local right
+    local length = encoder.len(encoding, text)
+
+    if char == 0 then
+        right = text
+    elseif char >= length then
+        right = ''
+    else
+        right = text:sub(encoder.offset(encoding, 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 (text, rows, changes)
+    for _, change in ipairs(changes) do
+        if change.range then
+            rows = rows or splitRows(text)
+            mergeRows(rows, change)
+        else
+            rows = nil
+            text = change.text
+        end
+    end
+    if rows then
+        text = table.concat(rows)
+    end
+    return text, rows
+end