Add a hash of matching opening / closing tokens

Instead of using substring, substitutions and conversion from/to symbols
for finding the opening token name of a given closing token, introduce a
hash of matching names.

This is not that useful for the existing tokens which have very similar
opening / closing names, but will make the code simpler for supporting
heredoc strings.

No functional change.

Author: smortex

lib/puppet-lint/plugins/check_strict_indent.rb

@@ -3,6 +3,11 @@
 
 PuppetLint.new_check(:'strict_indent') do
   def match(tokens)
+    opening_token = {
+      :RBRACE => :LBRACE,
+      :RBRACK => :LBRACK,
+      :RPAREN => :LPAREN,
+    }
     open = {
       :LBRACE => [],
       :LBRACK => [],
@@ -15,7 +20,7 @@ def match(tokens)
       if [:LBRACE, :LBRACK, :LPAREN].include?(token.type)
         open[token.type] << token
       elsif [:RBRACE, :RBRACK, :RPAREN].include?(token.type)
-        match = open[("L" + token.type.to_s[1..-1]).to_sym].pop
+        match = open[opening_token[token.type]].pop
         if not match.nil?
           matches[token] = match
           matches[match] = token