1 files changed, 63 insertions, 0 deletions
diff --git a/script/core/diagnostics/duplicate-index.lua b/script/core/diagnostics/duplicate-index.lua
new file mode 100644
index 00000000..dabe1b3c
--- /dev/null
+++ b/script/core/diagnostics/duplicate-index.lua
@@ -0,0 +1,63 @@
+local files   = require 'files'
+local guide   = require 'parser.guide'
+local lang    = require 'language'
+local define  = require 'proto.define'
+local vm      = require 'vm'
+
+return function (uri, callback)
+    local ast = files.getAst(uri)
+    if not ast then
+        return
+    end
+
+    guide.eachSourceType(ast.ast, 'table', function (source)
+        local mark = {}
+        for _, obj in ipairs(source) do
+            if obj.type == 'tablefield'
+            or obj.type == 'tableindex' then
+                local name = vm.getKeyName(obj)
+                if name then
+                    if not mark[name] then
+                        mark[name] = {}
+                    end
+                    mark[name][#mark[name]+1] = obj.field or obj.index
+                end
+            end
+        end
+
+        for name, defs in pairs(mark) do
+            local sname = name:match '^.|(.+)$'
+            if #defs > 1 and sname then
+                local related = {}
+                for i = 1, #defs do
+                    local def = defs[i]
+                    related[i] = {
+                        start  = def.start,
+                        finish = def.finish,
+                        uri    = uri,
+                    }
+                end
+                for i = 1, #defs - 1 do
+                    local def = defs[i]
+                    callback {
+                        start   = def.start,
+                        finish  = def.finish,
+                        related = related,
+                        message = lang.script('DIAG_DUPLICATE_INDEX', sname),
+                        level   = define.DiagnosticSeverity.Hint,
+                        tags    = { define.DiagnosticTag.Unnecessary },
+                    }
+                end
+                for i = #defs, #defs do
+                    local def = defs[i]
+                    callback {
+                        start   = def.start,
+                        finish  = def.finish,
+                        related = related,
+                        message = lang.script('DIAG_DUPLICATE_INDEX', sname),
+                    }
+                end
+            end
+        end
+    end)
+end