1 files changed, 69 insertions, 0 deletions
diff --git a/script-beta/core/diagnostics/ambiguity-1.lua b/script-beta/core/diagnostics/ambiguity-1.lua
new file mode 100644
index 00000000..37815fb5
--- /dev/null
+++ b/script-beta/core/diagnostics/ambiguity-1.lua
@@ -0,0 +1,69 @@
+local files = require 'files'
+local guide = require 'parser.guide'
+local lang  = require 'language'
+
+local opMap = {
+    ['+']  = true,
+    ['-']  = true,
+    ['*']  = true,
+    ['/']  = true,
+    ['//'] = true,
+    ['^']  = true,
+    ['<<'] = true,
+    ['>>'] = true,
+    ['&']  = true,
+    ['|']  = true,
+    ['~']  = true,
+    ['..'] = true,
+}
+
+local literalMap = {
+    ['number']  = true,
+    ['boolean'] = true,
+    ['string']  = true,
+    ['table']   = true,
+}
+
+return function (uri, callback)
+    local ast = files.getAst(uri)
+    if not ast then
+        return
+    end
+    local text = files.getText(uri)
+    guide.eachSourceType(ast.ast, 'binary', function (source)
+        if source.op.type ~= 'or' then
+            return
+        end
+        local first  = source[1]
+        local second = source[2]
+        -- a + (b or 0) --> (a + b) or 0
+        do
+            if opMap[first.op and first.op.type]
+                and first.type ~= 'unary'
+                and not second.op
+                and literalMap[second.type]
+                and not literalMap[first[2].type]
+            then
+                callback {
+                    start   = source.start,
+                    finish  = source.finish,
+                    message = lang.script('DIAG_AMBIGUITY_1', text:sub(first.start, first.finish))
+                }
+            end
+        end
+        -- (a or 0) + c --> a or (0 + c)
+        do
+            if opMap[second.op and second.op.type]
+                and second.type ~= 'unary'
+                and not first.op
+                and literalMap[second[1].type]
+            then
+                callback {
+                    start   = source.start,
+                    finish  = source.finish,
+                    message = lang.script('DIAG_AMBIGUITY_1', text:sub(second.start, second.finish))
+                }
+            end
+        end
+    end)
+end