From 448762908fd822fbc101a4fe66fac9cd8aa913b5 Mon Sep 17 00:00:00 2001
From: Sergio Queiroz <sqmedeiros@gmail.com>
Date: Mon, 14 Nov 2016 17:15:27 -0300
Subject: Changing documentation and examples with recovery

---
 examples/listId2Rec2.lua | 67 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 examples/listId2Rec2.lua

(limited to 'examples/listId2Rec2.lua')

diff --git a/examples/listId2Rec2.lua b/examples/listId2Rec2.lua
new file mode 100644
index 0000000..a347a5b
--- /dev/null
+++ b/examples/listId2Rec2.lua
@@ -0,0 +1,67 @@
+local m = require'lpeglabelrec'
+local re = require'relabelrec'
+
+local terror = {}
+
+local function newError(s)
+  table.insert(terror, s)
+  return #terror
+end
+
+local errUndef = newError("undefined")
+local errId = newError("expecting an identifier")
+local errComma = newError("expecting ','")
+
+local id = m.R'az'^1
+
+local g = m.P{
+  "S",
+  S = m.V"Id" * m.V"List",
+  List = -m.P(1) + m.V"Comma" * m.V"Id" * m.V"List",
+  Id = m.V"Sp" * id + m.T(errId),
+  Comma = m.V"Sp" * "," + m.T(errComma),
+  Sp = m.S" \n\t"^0,
+}
+
+local subject, errors
+
+function recorderror(pos, lab)
+	local line, col = re.calcline(subject, pos)
+	table.insert(errors, { line = line, col = col, msg = terror[lab] })
+end
+
+function record (lab)
+	return (m.Cp() * m.Cc(lab)) / recorderror
+end
+
+function sync (p)
+	return (-p * m.P(1))^0
+end
+
+local grec = m.P{
+  "S",
+  S = m.Rec(m.Rec(g, m.V"ErrComma", errComma), m.V"ErrId", errId),
+  ErrComma = record(errComma) * sync(-m.P(1) + id),
+	ErrId = record(errId) * sync(-m.P(1) + ",")
+}
+
+
+function mymatch (g, s)
+	errors = {}
+	subject = s	
+	local r, e, sfail = g:match(s)
+	if #errors > 0 then
+		local out = {}
+    for i, err in ipairs(errors) do
+    	local msg = "Error at line " .. err.line .. " (col " .. err.col .. "): " .. err.msg
+      table.insert(out,  msg)
+    end
+    return nil, table.concat(out, "\n")
+  end
+  return r
+end
+  
+print(mymatch(grec, "one,two"))
+print(mymatch(grec, "one two three"))
+print(mymatch(grec, "1,\n two, \n3,"))
+print(mymatch(grec, "one\n two123, \nthree,"))
-- 
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