fix #482

4 files changed, 53 insertions, 22 deletions

diff --git a/changelog.md b/changelog.md
index e2223eea..0e5310b5 100644
--- a/changelog.md
+++ b/changelog.md
@@ -3,6 +3,7 @@
 ## 1.21.0
 * `CHG` `LuaDoc`: supports `---@param self TYPE`
 * `CHG` completion: does not show suggests after `\n`, `{` and `,`, unless your setting `editor.acceptSuggestionOnEnter` is `off`
+* `FIX` [#482](https://github.com/sumneko/lua-language-server/issues/482)
 
 ## 1.20.1
 `2021-3-27`
diff --git a/script/provider/completion.lua b/script/provider/completion.lua
index 9cf3a39a..1adcc47a 100644
--- a/script/provider/completion.lua
+++ b/script/provider/completion.lua
@@ -1,4 +1,6 @@
-local proto = require 'proto'
+local proto  = require 'proto'
+local nonil  = require 'without-check-nil'
+local client = require 'provider.client'
 
 local isEnable = false
 
@@ -15,6 +17,11 @@ local function enable()
     if isEnable then
         return
     end
+    nonil.enable()
+    if not client.info.capabilities.textDocument.completion.dynamicRegistration then
+        return
+    end
+    nonil.disable()
     isEnable = true
     log.debug('Enable completion.')
     proto.awaitRequest('client/registerCapability', {
@@ -35,6 +42,11 @@ local function disable()
     if not isEnable then
         return
     end
+    nonil.enable()
+    if not client.info.capabilities.textDocument.completion.dynamicRegistration then
+        return
+    end
+    nonil.disable()
     isEnable = false
     log.debug('Disable completion.')
     proto.awaitRequest('client/unregisterCapability', {
diff --git a/script/provider/provider.lua b/script/provider/provider.lua
index 59af1c7a..11b87405 100644
--- a/script/provider/provider.lua
+++ b/script/provider/provider.lua
@@ -19,6 +19,7 @@ local plugin    = require 'plugin'
 local progress  = require 'progress'
 local tm        = require 'text-merger'
 local vm        = require 'vm'
+local nonil     = require 'without-check-nil'
 
 local function updateConfig()
     local diagnostics = require 'provider.diagnostic'
@@ -121,29 +122,38 @@ proto.on('initialized', function (params)
     updateConfig()
     local registrations = {}
 
-    -- 监视文件变化
-    registrations[#registrations+1] = {
-        id = 'workspace/didChangeWatchedFiles',
-        method = 'workspace/didChangeWatchedFiles',
-        registerOptions = {
-            watchers = {
-                {
-                    globPattern = '**/',
-                    kind = 1 | 2 | 4,
-                }
+    nonil.enable()
+    if client.info.capabilities.workspace.didChangeWatchedFiles.dynamicRegistration then
+        -- 监视文件变化
+        registrations[#registrations+1] = {
+            id = 'workspace/didChangeWatchedFiles',
+            method = 'workspace/didChangeWatchedFiles',
+            registerOptions = {
+                watchers = {
+                    {
+                        globPattern = '**/',
+                        kind = 1 | 2 | 4,
+                    }
+                },
             },
-        },
-    }
+        }
+    end
 
-    -- 监视配置变化
-    registrations[#registrations+1] = {
-        id = 'workspace/didChangeConfiguration',
-        method = 'workspace/didChangeConfiguration',
-    }
+    if client.info.capabilities.workspace.didChangeConfiguration.dynamicRegistration then
+        -- 监视配置变化
+        registrations[#registrations+1] = {
+            id = 'workspace/didChangeConfiguration',
+            method = 'workspace/didChangeConfiguration',
+        }
+    end
 
-    proto.awaitRequest('client/registerCapability', {
-        registrations = registrations
-    })
+    nonil.disable()
+
+    if #registrations ~= 0 then
+        proto.awaitRequest('client/registerCapability', {
+            registrations = registrations
+        })
+    end
     workspace.reload()
     return true
 end)
diff --git a/script/provider/semantic-tokens.lua b/script/provider/semantic-tokens.lua
index bc8f81b9..268b8648 100644
--- a/script/provider/semantic-tokens.lua
+++ b/script/provider/semantic-tokens.lua
@@ -4,6 +4,7 @@ local client         = require 'provider.client'
 local json           = require "json"
 local config         = require 'config'
 local lang           = require 'language'
+local nonil          = require 'without-check-nil'
 
 local isEnable = false
 
@@ -23,9 +24,11 @@ local function enable()
     if isEnable then
         return
     end
-    if not client.info.capabilities.textDocument.semanticTokens then
+    nonil.enable()
+    if not client.info.capabilities.textDocument.semanticTokens.dynamicRegistration then
         return
     end
+    nonil.disable()
     isEnable = true
     log.debug('Enable semantic tokens.')
     proto.awaitRequest('client/registerCapability', {
@@ -80,6 +83,11 @@ local function disable()
     if not isEnable then
         return
     end
+    nonil.enable()
+    if not client.info.capabilities.textDocument.semanticTokens.dynamicRegistration then
+        return
+    end
+    nonil.disable()
     isEnable = false
     log.debug('Disable semantic tokens.')
     proto.awaitRequest('client/unregisterCapability', {