Removing Terminal type and replacing with Literal, Escape, and AnyChar

This is to eventually simplify the combining of Literals together (and
to actually make it work correctly, since terminals should not have been
merged)

src/js/parser/javascript/grammar.peg

@@ -39,10 +39,11 @@ grammar JavascriptRegexp
                     / octal_esc
                     / hex_esc
                     / unicode_esc
-                    / null_esc
-                    / literal_esc )
-  charset_literal <- [^\\\]]
-  terminal <- any_character / escape / literal <Terminal>
+                    / null_esc )
+  charset_literal <- [^\\\]] / ( "\\" . )
+  terminal <- any_character <AnyCharacter>
+            / escape <Escape>
+            / literal <Literal>
   any_character <- "."
   escape <- ( word_boundary_esc
             / non_word_boundary_esc
@@ -62,9 +63,8 @@ grammar JavascriptRegexp
             / octal_esc
             / hex_esc
             / unicode_esc
-            / null_esc
-            / literal_esc )
-  literal <- [^|\\/.\[\(\)?+*$^]
+            / null_esc )
+  literal <- ( ""? literal:[^|\\/.\[\(\)?+*$^] ) / ( "\\" literal:. )
   back_reference <- "\\" [1-9]
   word_boundary_esc <- "\\b"
   non_word_boundary_esc <- "\\B"
@@ -85,4 +85,3 @@ grammar JavascriptRegexp
   hex_esc <- "\\x" [0-9a-fA-F] [0-9a-fA-F]
   unicode_esc <- "\\u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]
   null_esc <- "\\0"
-  literal_esc <- "\\" .