fix #279 parser native supports negative number

3 files changed, 8 insertions, 3 deletions

diff --git a/script/parser/compile.lua b/script/parser/compile.lua
index 56ce2489..1ba111ed 100644
--- a/script/parser/compile.lua
+++ b/script/parser/compile.lua
@@ -548,7 +548,9 @@ return function (self, lua, mode, version, options)
     LocalCount = 0
     Version = version
     Root = state.ast
-    Root.state = state
+    if Root then
+        Root.state = state
+    end
     Options = options
     state.ENVMode = ENVMode
     if type(state.ast) == 'table' then
diff --git a/script/parser/grammar.lua b/script/parser/grammar.lua
index d0a0b252..ad107ef5 100644
--- a/script/parser/grammar.lua
+++ b/script/parser/grammar.lua
@@ -258,7 +258,7 @@ StringClose <-  ']' =eq ']'
 ]]
 
 grammar 'Number' [[
-Number      <-  Sp ({} {NumberDef} {}) -> Number
+Number      <-  Sp ({} {'-'? NumberDef} {}) -> Number
                 NumberSuffix?
                 ErrNumber?
 NumberDef   <-  Number16 / Number10
@@ -534,6 +534,9 @@ return function (self, lua, mode)
         local err = errorpos(pos)
         return nil, err
     end
+    if type(r) ~= 'table' then
+        return nil
+    end
 
     return r
 end
diff --git a/script/parser/parse.lua b/script/parser/parse.lua
index e4935e7a..909ce315 100644
--- a/script/parser/parse.lua
+++ b/script/parser/parse.lua
@@ -42,7 +42,7 @@ return function (self, lua, mode, version, options)
     if not suc then
         return nil, res
     end
-    if not res then
+    if not res and err then
         state.pushError(err)
     end
     state.ast = res