first version of ropes.nim with unsafeNew (broken)

compiler/ccgmerge.nim

@@ -145,20 +145,47 @@ proc atEndMark(buf: cstring, pos: int): bool =
   while s < NimMergeEndMark.len and buf[pos+s] == NimMergeEndMark[s]: inc s
   result = s == NimMergeEndMark.len
 
+when false:
+  proc readVerbatimSection(L: var TBaseLexer): PRope = 
+    var pos = L.bufpos
+    var buf = L.buf
+    result = newMutableRope(30_000)
+    while true:
+      case buf[pos]
+      of CR:
+        pos = lexbase.HandleCR(L, pos)
+        buf = L.buf
+        result.data.add(tnl)
+      of LF:
+        pos = lexbase.HandleLF(L, pos)
+        buf = L.buf
+        result.data.add(tnl)
+      of '\0':
+        InternalError("ccgmerge: expected: " & NimMergeEndMark)
+        break
+      else: 
+        if atEndMark(buf, pos):
+          inc pos, NimMergeEndMark.len
+          break
+        result.data.add(buf[pos])
+        inc pos
+    L.bufpos = pos
+    freezeMutableRope(result)
+
 proc readVerbatimSection(L: var TBaseLexer): PRope = 
   var pos = L.bufpos
   var buf = L.buf
-  result = newMutableRope(30_000)
+  var r = newStringOfCap(30_000)
   while true:
     case buf[pos]
     of CR:
       pos = lexbase.HandleCR(L, pos)
       buf = L.buf
-      result.data.add(tnl)
+      r.add(tnl)
     of LF:
       pos = lexbase.HandleLF(L, pos)
       buf = L.buf
-      result.data.add(tnl)
+      r.add(tnl)
     of '\0':
       InternalError("ccgmerge: expected: " & NimMergeEndMark)
       break
@@ -166,10 +193,10 @@ proc readVerbatimSection(L: var TBaseLexer): PRope =
       if atEndMark(buf, pos):
         inc pos, NimMergeEndMark.len
         break
-      result.data.add(buf[pos])
+      r.add(buf[pos])
       inc pos
   L.bufpos = pos
-  freezeMutableRope(result)
+  result = r.toRope
 
 proc readKey(L: var TBaseLexer, result: var string) =
   var pos = L.bufpos