From ff2dbe372a8759acb1c52bb6296ae7b0866180d5 Mon Sep 17 00:00:00 2001
From: sqmedeiros <sqmedeiros@gmail.com>
Date: Fri, 23 Dec 2022 15:48:12 -0300
Subject: Removing label ExpItem. Label MisClose8 signals a missing closing ']'
 or an empty char class

---
 relabel.lua           |  6 ++----
 testrelabelparser.lua | 38 ++++++++++++++++++--------------------
 2 files changed, 20 insertions(+), 24 deletions(-)

diff --git a/relabel.lua b/relabel.lua
index f4f4546..5190a98 100644
--- a/relabel.lua
+++ b/relabel.lua
@@ -56,8 +56,6 @@ local errinfo = {
 
   ExpNameOrLab = "expected a name or label after '%' (no space)",
 
-  ExpItem = "expected at least one item after '[' or '^'",
-
   MisClose1 = "missing closing ')'",
   MisClose2 = "missing closing ':}'",
   MisClose3 = "missing closing '~}'",
@@ -67,7 +65,7 @@ local errinfo = {
   MisClose6 = "missing closing '>'",
   MisClose7 = "missing closing '}'",  -- for the labels
 
-  MisClose8 = "missing closing ']'",
+  MisClose8 = "missing closing ']' or empty char class",
 
   MisTerm1 = "missing terminating single quote",
   MisTerm2 = "missing terminating double quote",
@@ -187,7 +185,7 @@ local item = (defined + Range + m.C(any)) / m.P
 local Class =
     "["
   * (m.C(m.P"^"^-1))    -- optional complement symbol
-  * m.Cf(expect(item, "ExpItem") * (item - "]")^0, mt.__add)
+  * m.Cf(item * (item - "]")^0, mt.__add)
     / function (c, p) return c == "^" and any - p or p end
   * expect("]", "MisClose8")
 
diff --git a/testrelabelparser.lua b/testrelabelparser.lua
index 0399ff6..27c3e52 100644
--- a/testrelabelparser.lua
+++ b/testrelabelparser.lua
@@ -8,14 +8,14 @@ function testerror(repatt, msg)
     -- expecting a syntax error
     err = err:match("^[^\n]*\n(.-)$") -- remove first line (filename)
     err = err:gsub("[ \t]*\n", "\n") -- remove trailing spaces
-    -- if err ~= msg then
-    --   print(#err, #msg)
-    --   print('--')
-    --   print(err)
-    --   print('--')
-    --   print(msg)
-    --   print('--')
-    -- end
+    --if err ~= msg then
+    	--print(#err, #msg)
+    	--print('--')
+    	--print(err)
+    	--print('--')
+    	--print(msg)
+    	--print('--')
+    --end
     assert(err == msg)
   else
     -- expecting a non-syntax error
@@ -366,16 +366,14 @@ L1:C2: expected a name or label after '%' (no space)
  ^
 ]])
 
--- testing ExpItem
+-- testing empty char set (MisClose8, previously MisItem)
 
 testerror([[
-"p" [
-abc
-] "q"  
+"p" [] "q"
 ]], [[
-L1:C6: expected at least one item after '[' or '^'
-"p" [
-     ^
+L2:C1: missing closing ']' or empty char class
+
+^
 ]])
 
 -- testing MisClose1
@@ -451,31 +449,31 @@ L1:C9: missing closing '}'
 -- testing MisClose8
 
 testerror([[[]], [[
-L1:C2: missing closing ']'
+L1:C2: missing closing ']' or empty char class
 [
  ^
 ]])
 
 testerror([[[^]], [[
-L1:C3: missing closing ']'
+L1:C3: missing closing ']' or empty char class
 [^
   ^
 ]])
 
 testerror([[[] ]], [[
-L1:C4: missing closing ']'
+L1:C4: missing closing ']' or empty char class
 []
    ^
 ]])
 
 testerror([[[^] 	]], [[
-L1:C6: missing closing ']'
+L1:C6: missing closing ']' or empty char class
 [^]
      ^
 ]])
 
 testerror([[[_-___-_|]], [[
-L1:C10: missing closing ']'
+L1:C10: missing closing ']' or empty char class
 [_-___-_|
          ^
 ]])
-- 
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