resolve #1248 supports spaces before --[[@as]]

Author: sumneko

script/parser/luadoc.lua

@@ -142,6 +142,7 @@ Symbol              <-  ({} {
 ---@field signs parser.object[]
 ---@field originalComment parser.object
 ---@field as? parser.object
+---@field touch? integer
 
 local function trim(str)
     return str:match '^%s*(%S+)%s*$'
@@ -1671,6 +1672,22 @@ local function bindDocs(state)
     end
 end
 
+local function findTouch(state, doc)
+    local text = state.lua
+    local pos  = guide.positionToOffset(state, doc.originalComment.start)
+    for i = pos - 2, 1, -1 do
+        local c = text:sub(i, i)
+        if c == '\r'
+        or c == '\n' then
+            break
+        elseif c ~= ' '
+        and    c ~= '\t' then
+            doc.touch = guide.offsetToPosition(state, i)
+            break
+        end
+    end
+end
+
 return function (state)
     local ast = state.ast
     local comments = state.comms
@@ -1714,6 +1731,9 @@ return function (state)
                 ast.finish = doc.finish
             end
             doc.originalComment = comment
+            if comment.type == 'comment.long' then
+                findTouch(state, doc)
+            end
         end
     end
 

script/vm/compiler.lua

@@ -585,12 +585,12 @@ local function bindAs(source)
         ases = {}
         docs._asCache = ases
         for _, doc in ipairs(docs) do
-            if doc.type == 'doc.as' and doc.as then
+            if doc.type == 'doc.as' and doc.as and doc.touch then
                 ases[#ases+1] = doc
             end
         end
         table.sort(ases, function (a, b)
-            return a.start < b.start
+            return a.touch < b.touch
         end)
     end
 
@@ -609,15 +609,15 @@ local function bindAs(source)
         end
         index = left + (right - left) // 2
         local doc = ases[index]
-        if doc.originalComment.start < source.finish + 2 then
+        if doc.touch < source.finish then
             left = index + 1
         else
             right = index
         end
     end
 
     local doc = ases[index]
-    if doc and doc.originalComment.start == source.finish + 2 then
+    if doc and doc.touch == source.finish then
         vm.setNode(source, vm.compileNode(doc.as), true)
         return true
     end

test/type_inference/init.lua

@@ -3230,3 +3230,7 @@ end
 
 local <?x?> = f()
 ]=]
+
+TEST 'number' [=[
+local <?x?> = X --[[@as number]]
+]=]