1 files changed, 168 insertions, 0 deletions
diff --git a/script/proto/converter.lua b/script/proto/converter.lua
new file mode 100644
index 00000000..19d592fe
--- /dev/null
+++ b/script/proto/converter.lua
@@ -0,0 +1,168 @@
+local guide = require 'parser.guide'
+local files = require 'files'
+
+local m = {}
+
+---@alias position {line: integer, character: integer}
+
+local function rawPackPosition(uri, pos)
+    local row, col = guide.rowColOf(pos)
+    if col > 0 then
+        local state = files.getState(uri)
+        local text  = files.getText(uri)
+        if text then
+            local lineOffset = state.lines[row]
+            col = utf8.len(text, lineOffset, lineOffset + col - 1, true)
+        end
+    end
+    return {
+        line      = row,
+        character = col,
+    }
+end
+
+local function diffedPackPosition(uri, pos)
+    local state        = files.getState(uri)
+    local offset       = guide.positionToOffset(state, pos)
+    local originOffset = files.diffedOffsetBack(uri, offset)
+    local originLines  = files.getOriginLines(uri)
+    local originPos    = guide.offsetToPositionByLines(originLines, originOffset)
+    local row, col     = guide.rowColOf(originPos)
+    if col > 0 then
+        local text = files.getOriginText(uri)
+        if text then
+            local lineOffset = originLines[row]
+            col = utf8.len(text, lineOffset, lineOffset + col - 1, true)
+        end
+    end
+    return {
+        line      = row,
+        character = col,
+    }
+end
+
+---@param uri uri
+---@param pos integer
+---@return position
+function m.packPosition(uri, pos)
+    if files.hasDiffed(uri) then
+        return diffedPackPosition(uri, pos)
+    else
+        return rawPackPosition(uri, pos)
+    end
+end
+
+local function rawUnpackPosition(uri, position)
+    local row, col = position.line, position.character
+    if col > 0 then
+        local state = files.getState(uri)
+        local text  = files.getText(uri)
+        if text then
+            local lineOffset = state.lines[row]
+            local textOffset = utf8.offset(text, col + 1, lineOffset)
+            if textOffset then
+                col = textOffset - lineOffset
+            end
+        end
+    end
+    local pos = guide.positionOf(row, col)
+    return pos
+end
+
+local function diffedUnpackPosition(uri, position)
+    local row, col     = position.line, position.character
+    local originLines  = files.getOriginLines(uri)
+    if col > 0 then
+        local text  = files.getOriginText(uri)
+        if text then
+            local lineOffset = originLines[row]
+            local textOffset = utf8.offset(text, col + 1, lineOffset)
+            if textOffset then
+                col = textOffset - lineOffset
+            end
+        end
+    end
+    local state        = files.getState(uri)
+    local originPos    = guide.positionOf(row, col)
+    local originOffset = guide.positionToOffsetByLines(originLines, originPos)
+    local offset       = files.diffedOffset(uri, originOffset)
+    local pos          = guide.offsetToPosition(state, offset)
+    return pos
+end
+
+---@param uri      uri
+---@param position position
+---@return integer
+function m.unpackPosition(uri, position)
+    if files.hasDiffed(uri) then
+        return diffedUnpackPosition(uri, position)
+    else
+        return rawUnpackPosition(uri, position)
+    end
+end
+
+---@alias range {start: position, end: position}
+
+---@param uri    uri
+---@param start  integer
+---@param finish integer
+---@return range
+function m.packRange(uri, start, finish)
+    local range = {
+        start   = m.packPosition(uri, start),
+        ['end'] = m.packPosition(uri, finish),
+    }
+    return range
+end
+
+---@param uri   uri
+---@param range range
+---@return integer start
+---@return integer finish
+function m.unpackRange(uri, range)
+    local start  = m.unpackPosition(uri, range.start)
+    local finish = m.unpackPosition(uri, range['end'])
+    return start, finish
+end
+
+---@alias location {uri: uri, range: range}
+
+---@param uri string
+---@param range range
+---@return location
+function m.location(uri, range)
+    return {
+        uri   = uri,
+        range = range,
+    }
+end
+
+---@alias locationLink {targetUri:uri, targetRange: range, targetSelectionRange: range, originSelectionRange: range}
+
+---@param uri string
+---@param range range
+---@param selection range
+---@param origin range
+---@return locationLink
+function m.locationLink(uri, range, selection, origin)
+    return {
+        targetUri            = uri,
+        targetRange          = range,
+        targetSelectionRange = selection,
+        originSelectionRange = origin,
+    }
+end
+
+---@alias textEdit {range: range, newText: string}
+
+---@param range   range
+---@param newtext string
+---@return textEdit
+function m.textEdit(range, newtext)
+    return {
+        range   = range,
+        newText = newtext,
+    }
+end
+
+return m