From c5574a9e8396498769e1f2a91609d08cbb0f86eb Mon Sep 17 00:00:00 2001
From: Sérgio Queiroz <sqmedeiros@gmail.com>
Date: Tue, 19 Dec 2017 13:13:10 -0300
Subject: Updating relabel's parser after removing /{} and //{}

---
 relabel.lua           | 38 +++-----------------------------------
 testrelabelparser.lua | 41 +++++++++++------------------------------
 2 files changed, 14 insertions(+), 65 deletions(-)

diff --git a/relabel.lua b/relabel.lua
index 6a676b9..3188163 100644
--- a/relabel.lua
+++ b/relabel.lua
@@ -31,7 +31,7 @@ local errinfo = {
   {"NoPatt", "no pattern found"},
   {"ExtraChars", "unexpected characters after the pattern"},
 
-  {"ExpPatt1", "expected a pattern after '/' and '//{...}', or the label(s) after '/{' and '//{'"},
+  {"ExpPatt1", "expected a pattern after '/'"},
 
   {"ExpPatt2", "expected a pattern after '&'"},
   {"ExpPatt3", "expected a pattern after '!'"},
@@ -52,8 +52,7 @@ local errinfo = {
   {"ExpName2", "expected the name of a rule after '=' (no space)"},
   {"ExpName3", "expected the name of a rule after '<' (no space)"},
 
-  {"ExpLab1", "expected at least one label after '{'"},
-  {"ExpLab2", "expected a label after the comma"},
+  {"ExpLab1", "expected a label after '{'"},
 
   {"ExpNameOrLab", "expected a name or label after '%' (no space)"},
 
@@ -216,41 +215,10 @@ local function NT (n, b)
   end
 end
 
-local function choicerec (...)
-  local t = { ... }
-  local n = #t
-  local p = t[1]
-  local i = 2
-
-  while i + 2 <= n do
-    -- t[i] is '/' or '//'
-    -- t[i+1] == false  when there are no labels
-		-- t[i+2] is a pattern
-		if t[i] == '/' then
-			if not t[i+1] then
-				p = mt.__add(p, t[i+2])
-			else
-				p = mm.Lc(p, t[i+2], unpack(t[i+1]))
-			end 
-		else -- t[i] is '//'
-				p = mm.Rec(p, t[i+2], unpack(t[i+1]))
-		end
-    i = i + 3
-  end
-
-  return p
-end
-
 
 local exp = m.P{ "Exp",
   Exp = S * ( m.V"Grammar"
-            + (m.V"Seq" * (S * ((m.C(m.P"//" + "/") * m.Ct(m.V"Labels")) + (m.C"/" * m.Cc(false)))
-                                   * expect(S * m.V"Seq", "ExpPatt1")
-                            )^0
-              ) / choicerec);
-  Labels = m.P"{" * expect(S * m.V"Label", "ExpLab1")
-           * (S * "," * expect(S * m.V"Label", "ExpLab2"))^0
-           * expect(S * "}", "MisClose7");
+              + m.Cf(m.V"Seq" * (S * "/" * expect(S * m.V"Seq", "ExpPatt1"))^0, mt.__add) );
   Seq = m.Cf(m.Cc(m.P"") * m.V"Prefix" * (S * m.V"Prefix")^0, mt.__mul);
   Prefix = "&" * expect(S * m.V"Prefix", "ExpPatt2") / mt.__len
          + "!" * expect(S * m.V"Prefix", "ExpPatt3") / mt.__unm
diff --git a/testrelabelparser.lua b/testrelabelparser.lua
index 2ca8528..0399ff6 100644
--- a/testrelabelparser.lua
+++ b/testrelabelparser.lua
@@ -53,26 +53,14 @@ L1:C5: unexpected characters after the pattern
 
 -- testing ExpPatt1
 
-testerror([['p' //{1}]], [[
-L1:C10: expected a pattern after '/' and '//{...}', or the label(s) after '/{' and '//{'
-'p' //{1}
-         ^
-]])
-
-testerror([['p' //{1} //{2} 'q']], [[
-L1:C10: expected a pattern after '/' and '//{...}', or the label(s) after '/{' and '//{'
-'p' //{1} //{2} 'q'
-         ^
-]])
-
 testerror([['p' /]], [[
-L1:C6: expected a pattern after '/' and '//{...}', or the label(s) after '/{' and '//{'
+L1:C6: expected a pattern after '/'
 'p' /
      ^
 ]])
 
 testerror([['p' / / 'q']], [[
-L1:C6: expected a pattern after '/' and '//{...}', or the label(s) after '/{' and '//{'
+L1:C6: expected a pattern after '/'
 'p' / / 'q'
      ^
 ]])
@@ -249,22 +237,22 @@ L1:C2: expected a pattern or closing '}' after '{'
  ^
 ]])
 
--- testing ExpNum
+-- testing ExpNumName
 
 testerror([['p' ^ n]], [[
-L1:C6: expected a number after '^', '+' or '-' (no space)
+L1:C6: expected a number, '+', '-' or a name (no space) after '^'
 'p' ^ n
      ^
 ]])
 
 testerror([['p'^+(+1)]], [[
-L1:C5: expected a number after '^', '+' or '-' (no space)
+L1:C5: expected a number, '+', '-' or a name (no space) after '^'
 'p'^+(+1)
     ^
 ]])
 
 testerror([['p'^-/'q']], [[
-L1:C5: expected a number after '^', '+' or '-' (no space)
+L1:C5: expected a number, '+', '-' or a name (no space) after '^'
 'p'^-/'q'
     ^
 ]])
@@ -351,25 +339,18 @@ L1:C2: expected the name of a rule after '<' (no space)
 
 -- testing ExpLab1
 
-testerror([['p' //{} 'q']], [[
-L1:C8: expected at least one label after '{'
-'p' //{} 'q'
-       ^
+testerror([['p' %{} 'q']], [[
+L1:C7: expected a label after '{'
+'p' %{} 'q'
+      ^
 ]])
 
 testerror([[%{ 'label' }]], [[
-L1:C3: expected at least one label after '{'
+L1:C3: expected a label after '{'
 %{ 'label' }
   ^
 ]])
 
--- testing ExpLab2
-
-testerror([['p' //{1,2,3,} 'q']], [[
-L1:C14: expected a label after the comma
-'p' //{1,2,3,} 'q'
-             ^
-]])
 
 -- testing ExpNameOrLab
 
-- 
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