From 20cb6e1443f3b79a4db3fedf25bc2eff91ef7d70 Mon Sep 17 00:00:00 2001
From: Sergio Queiroz <sqmedeiros@gmail.com>
Date: Tue, 13 Dec 2016 13:58:50 -0300
Subject: Fixing README.md after the merge

---
 README.md | 114 --------------------------------------------------------------
 1 file changed, 114 deletions(-)

diff --git a/README.md b/README.md
index 9484b3d..9bc162d 100644
--- a/README.md
+++ b/README.md
@@ -74,15 +74,6 @@ Otherwise, the result of the matching of `p1` is the pattern's result.
 
 
 
-#### <a name="f-rec"></a><code>lpeglabel.Rec(p1, p2 [, l1, ..., ln])</code>
-
-The *recovery operator* is similar to labeled order choice except
-that the matching of `p2` is tried from the failure position of `p1`.
-
-If no label is provided, the regular PEG failure is caught
-i.e. `lpeg.Rec(p1, p2)` is equivalent to `lpeg.Rec(p1, p2, 0)`.
-
-
 #### <a name="re-t"></a><code>%{l}</code>
 
 Syntax of *relabelrec* module. Equivalent to `lpeg.T(l)`.
@@ -698,108 +689,3 @@ print(eval "3)")
 -- syntax error: extra characters found after the expression (at index 2)
 -- Result = 3
 ```
-
-#### Error Recovery
-
-By using labeled ordered choice or the recovery operator, when a label
-is thrown, the parser may record the error and still continue parsing
-to find more errors. We can even record the error right away without
-actually throwing a label (relying on the regular PEG failure instead).
-Below we rewrite the arithmetic expression example and modify
-the `expect` function to use the recovery operator for error recovery:
-
-```lua
-local lpeg = require"lpeglabel"
-
-local R, S, P, V = lpeg.R, lpeg.S, lpeg.P, lpeg.V
-local C, Cc, Ct, Cmt, Carg = lpeg.C, lpeg.Cc, lpeg.Ct, lpeg.Cmt, lpeg.Carg
-local T, Lc, Rec = lpeg.T, lpeg.Lc, lpeg.Rec
-
-local labels = {
-  {"NoExp",     "no expression found"},
-  {"Extra",     "extra characters found after the expression"},
-  {"ExpTerm",   "expected a term after the operator"},
-  {"ExpExp",    "expected an expression after the parenthesis"},
-  {"MisClose",  "missing a closing ')' after the expression"},
-}
-
-local function labelindex(labname)
-  for i, elem in ipairs(labels) do
-    if elem[1] == labname then
-      return i
-    end
-  end
-  error("could not find label: " .. labname)
-end
-
-local function expect(patt, labname, recpatt)
-  local i = labelindex(labname)
-  local function recorderror(input, pos, errors)
-    table.insert(errors, {i, pos})
-    return true
-  end
-	if not recpatt then recpatt = P"" end
-  return Rec(patt, Cmt(Carg(1), recorderror) * recpatt)
-end
-
-local num = R("09")^1 / tonumber
-local op = S("+-*/")
-
-local function compute(tokens)
-  local result = tokens[1]
-  for i = 2, #tokens, 2 do
-    if tokens[i] == '+' then
-      result = result + tokens[i+1]
-    elseif tokens[i] == '-' then
-      result = result - tokens[i+1]
-    elseif tokens[i] == '*' then
-      result = result * tokens[i+1]
-    elseif tokens[i] == '/' then
-      result = result / tokens[i+1]
-    else
-      error('unknown operation: ' .. tokens[i])
-    end
-  end
-  return result
-end
-
-
-local g = P {
-  "Exp",
-  Exp = Ct(V"Term" * (C(op) * V"Operand")^0) / compute;
-  Operand = expect(V"Term", "ExpTerm", Cc(0));
-  Term = num + V"Group";
-  Group = "(" *  V"InnerExp" * expect(")", "MisClose");
-  InnerExp = expect(V"Exp", "ExpExp", (P(1) - ")")^0 * Cc(0));
-}
-
-g = expect(g, "NoExp", P(1)^0) * expect(-P(1), "Extra")
-
-local function eval(input)
-  local errors = {}
-  local result, label, suffix = g:match(input, 1, errors)
-  if #errors == 0 then
-    return result
-  else
-    local out = {}
-    for i, err in ipairs(errors) do
-      local pos = err[2]
-      local msg = labels[err[1]][2]
-      table.insert(out, "syntax error: " .. msg .. " (at index " .. pos .. ")")
-    end
-    return nil, table.concat(out, "\n")
-  end
-end
-
-print(eval "98-76*(54/32)")
---> 37.125
-
-print(eval "-1+(1-(1*2))/2")
---> syntax error: no expression found (at index 1)
-
-print(eval "(1+1-1*(2/2+)-():")
---> syntax error: expected a term after the operator (at index 13)
---> syntax error: expected an expression after the parenthesis (at index 16)
---> syntax error: missing a closing ')' after the expression (at index 17)
---> syntax error: extra characters found after the expression (at index 17)
-```
-- 
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