跳过动作

3 files changed, 12 insertions, 3 deletions

diff --git a/server/src/core/vm.lua b/server/src/core/vm.lua
index 36a8f21b..a17727d6 100644
--- a/server/src/core/vm.lua
+++ b/server/src/core/vm.lua
@@ -1383,6 +1383,10 @@ function mt:doLocalFunction(action)
 end
 
 function mt:doAction(action)
+    if not action then
+        -- Skip
+        return
+    end
     local tp = action.type
     if     tp == 'do' then
         self:doDo(action)
diff --git a/server/src/parser/ast.lua b/server/src/parser/ast.lua
index d08db694..993a4914 100644
--- a/server/src/parser/ast.lua
+++ b/server/src/parser/ast.lua
@@ -379,6 +379,9 @@ local defs = {
     Nothing = function ()
         return nil
     end,
+    Skip = function ()
+        return false
+    end,
     Set = function (keys, values)
         return {
             type = 'set',
diff --git a/server/src/parser/grammar.lua b/server/src/parser/grammar.lua
index 133ffbbd..6dfbeed6 100644
--- a/server/src/parser/grammar.lua
+++ b/server/src/parser/grammar.lua
@@ -75,8 +75,8 @@ end
 local function errorpos(pos, err)
     return {
         type = 'UNKNOWN',
-        start = pos,
-        finish = pos,
+        start = pos or 0,
+        finish = pos or 0,
         err = err,
     }
 end
@@ -351,7 +351,7 @@ Set         <-  END
 
 grammar 'Action' [[
 Action      <-  Sp (CrtAction / UnkAction)
-CrtAction   <-  SEMICOLON
+CrtAction   <-  Semicolon
             /   Do
             /   Break
             /   Return
@@ -372,6 +372,8 @@ UnkAction   <-  ({} {Word+})
             /   ({} {. (!Sps !CrtAction .)*})
             ->  UnknownSymbol
 
+Semicolon   <-  SEMICOLON
+            ->  Skip
 SimpleList  <-  (Simple (COMMA Simple)*)
             ->  List