fix runtime errors

7 files changed, 22 insertions, 9 deletions

diff --git a/script/core/diagnostics/newline-call.lua b/script/core/diagnostics/newline-call.lua
index cb318380..ee08cc35 100644
--- a/script/core/diagnostics/newline-call.lua
+++ b/script/core/diagnostics/newline-call.lua
@@ -4,10 +4,10 @@ local lang  = require 'language'
 
 return function (uri, callback)
     local ast = files.getAst(uri)
-    if not ast then
+    local lines = files.getLines(uri)
+    if not ast or not lines then
         return
     end
-    local lines = files.getLines(uri)
 
     guide.eachSourceType(ast.ast, 'call', function (source)
         local node = source.node
diff --git a/script/core/document-symbol.lua b/script/core/document-symbol.lua
index f06e613c..3bfc744c 100644
--- a/script/core/document-symbol.lua
+++ b/script/core/document-symbol.lua
@@ -222,11 +222,11 @@ end
 
 local function makeSymbol(uri)
     local ast = files.getAst(uri)
-    if not ast then
+    local text = files.getText(uri)
+    if not ast or not text then
         return nil
     end
 
-    local text = files.getText(uri)
     local symbols = {}
     local used = {}
     guide.eachSource(ast.ast, function (source)
diff --git a/script/core/highlight.lua b/script/core/highlight.lua
index 86b9315a..07481927 100644
--- a/script/core/highlight.lua
+++ b/script/core/highlight.lua
@@ -229,6 +229,9 @@ return function (uri, offset)
             else
                 return
             end
+            if not target then
+                return
+            end
             if mark[target] then
                 return
             end
diff --git a/script/core/hint.lua b/script/core/hint.lua
index aa39812f..737d03aa 100644
--- a/script/core/hint.lua
+++ b/script/core/hint.lua
@@ -43,6 +43,9 @@ local function typeHint(uri, edits, start, finish)
         elseif source.type == 'tableindex' then
             src = source.index
         end
+        if not src then
+            return
+        end
         edits[#edits+1] = {
             newText = (':%s'):format(infer),
             start   = src.finish,
diff --git a/script/core/reference.lua b/script/core/reference.lua
index f828e0cb..64dd6268 100644
--- a/script/core/reference.lua
+++ b/script/core/reference.lua
@@ -93,9 +93,13 @@ return function (uri, offset)
         elseif src.type == 'table' and src.parent.type ~= 'return' then
             goto CONTINUE
         end
+        local ouri = files.getOriginUri(root.uri)
+        if not ouri then
+            goto CONTINUE
+        end
         results[#results+1] = {
             target = src,
-            uri    = files.getOriginUri(root.uri),
+            uri    = ouri,
         }
         ::CONTINUE::
     end
diff --git a/script/core/rename.lua b/script/core/rename.lua
index 3f73c338..6df3778e 100644
--- a/script/core/rename.lua
+++ b/script/core/rename.lua
@@ -453,6 +453,9 @@ function m.rename(uri, pos, newname)
 
     rename(source, newname, function (target, start, finish, text)
         local turi = files.getOriginUri(guide.getUri(target))
+        if not turi then
+            return
+        end
         local uid = turi .. start
         if mark[uid] then
             return
diff --git a/script/core/workspace-symbol.lua b/script/core/workspace-symbol.lua
index 4fc6a854..86b644d3 100644
--- a/script/core/workspace-symbol.lua
+++ b/script/core/workspace-symbol.lua
@@ -20,8 +20,8 @@ local function buildSource(uri, source, key, results)
     elseif source.type == 'setfield'
     or     source.type == 'tablefield' then
         local field = source.field
-        local name  = field[1]
-        if matchKey(key, name) then
+        local name  = field and field[1]
+        if name and matchKey(key, name) then
             results[#results+1] = {
                 name  = name,
                 kind  = define.SymbolKind.Field,
@@ -31,8 +31,8 @@ local function buildSource(uri, source, key, results)
         end
     elseif source.type == 'setmethod' then
         local method = source.method
-        local name  = method[1]
-        if matchKey(key, name) then
+        local name   = method and method[1]
+        if name and matchKey(key, name) then
             results[#results+1] = {
                 name  = name,
                 kind  = define.SymbolKind.Method,