parser: add comment about structure of elements to each table

mercurial/fileset.py

@@ -10,6 +10,7 b' import parser, error, util, merge'
 from i18n import _
 
 elements = {
+    # token-type: binding-strength, prefix, infix, suffix
     "(": (20, ("group", 1, ")"), ("func", 1, ")")),
     "-": (5, ("negate", 19), ("minus", 5)),
     "not": (10, ("not", 10)),

mercurial/revset.py

@@ -115,6 +115,7 b' def _revsbetween(repo, roots, heads):'
     return baseset(sorted(reachable))
 
 elements = {
+    # token-type: binding-strength, prefix, infix, suffix
     "(": (21, ("group", 1, ")"), ("func", 1, ")")),
     "##": (20, None, ("_concat", 20)),
     "~": (18, None, ("ancestor", 18)),

mercurial/templater.py

@@ -15,6 +15,7 b' import minirst'
 # template parsing
 
 elements = {
+    # token-type: binding-strength, prefix, infix, suffix
     "(": (20, ("group", 1, ")"), ("func", 1, ")")),
     ",": (2, None, ("list", 2)),
     "|": (5, None, ("|", 5)),