remove compile-time checks for unsupported, pre-1.6 Nim versions

src/regex/common.nim

@@ -1,13 +1,6 @@
 import std/unicode
 import std/strutils
 
-when (NimMajor, NimMinor, NimPatch) < (0, 20, 0):
-  import sets
-  proc initHashSet*[T](size = 2): HashSet[T] =
-    result = initSet[T](size)
-  proc toHashSet*[T](keys: openArray[T]): HashSet[T] =
-    result = toSet[T](keys)
-
 type
   RegexError* = object of ValueError
   ## raised when the pattern

src/regex/compiler.nim

@@ -24,7 +24,7 @@ func reImpl*(s: string, flags: RegexFlags = {}): Regex {.inline.} =
     flags: flags,
     litOpt: opt
   )
-  when defined(regexDotDir) and (NimMajor, NimMinor) >= (1, 2):
+  when defined(regexDotDir):
     const regexDotDir {.strdefine.} = ""
     graphToFile(result, regexDotDir)
 

src/regex/dotgraph.nim

@@ -1,7 +1,6 @@
 import std/strutils
-when (NimMajor, NimMinor) >= (1, 2):
-  import std/hashes
-  import std/os
+import std/hashes
+import std/os
 
 import ./nfatype
 import ./types
@@ -48,13 +47,12 @@ func graph*(nfa: Nfa): string =
 func graph*(regex: Regex): string =
   result = graph(regex.nfa)
 
-when (NimMajor, NimMinor) >= (1, 2):
-  func graphToFile*(regex: Regex, dir: string) =
-    {.noSideEffect.}:
-      if dir.len > 0:
-        let content = graph(regex)
-        let fname = $hash(content) & ".dot"
-        try:
-          writeFile(dir / fname, content)
-        except IOError:
-          debugEcho "write file error"
+func graphToFile*(regex: Regex, dir: string) =
+  {.noSideEffect.}:
+    if dir.len > 0:
+      let content = graph(regex)
+      let fname = $hash(content) & ".dot"
+      try:
+        writeFile(dir / fname, content)
+      except IOError:
+        debugEcho "write file error"

src/regex/litopt.nim

@@ -53,9 +53,6 @@ import ./types
 import ./nodematch
 import ./nfa
 
-when (NimMajor, NimMinor, NimPatch) < (0, 20, 0):
-  import common
-
 type
   LitNfa = Enfa
   End = seq[int16]

src/regex/nfa.nim

@@ -193,10 +193,6 @@ func teClosure(
   for s in eNfa.s[state].next:
     teClosure(result, eNfa, s, processing, eTransitions)
 
-when (NimMajor, NimMinor, NimPatch) < (1,4,0) and not declared(IndexDefect):
-  # avoids a warning
-  type IndexDefect = IndexError
-
 func eRemoval*(eNfa: Enfa): Nfa {.raises: [].} =
   ## Remove e-transitions and return
   ## remaining state transtions and

src/regex/parser.nim

@@ -479,14 +479,10 @@ func parseRepRange(sc: Scanner[Rune]): Node =
   var
     firstNum: int
     lastNum: int
-  when (NimMajor, NimMinor, NimPatch) < (0, 19, 9):
-    type MyError = ref OverflowError
-  else:
-    type MyError = ref ValueError
   try:
     discard parseInt(first, firstNum)
     discard parseInt(last, lastNum)
-  except MyError:
+  except ValueError:
     prettyCheck(
       false,
       "Invalid repetition range. Max value is $#" %% $int16.high)

src/regex/types.nim

@@ -1,6 +1,5 @@
 # XXX hack because of nfamatch compile warning
-when NimMajor >= 1:
-  {.used.}
+{.used.}
 
 import std/unicode
 import std/sets