revset: move validation of incomplete parsing to parse() function

revset.parse() should be responsible for all parsing errors. Perhaps it wasn't
because 'revset.parse' was not a real function when the validation code was
added at ffcb7e4d719f.

mercurial/commands.py

@@ -2918,7 +2918,7 b' def debugrevspec(ui, repo, expr, **opts)'
     expansion.
     """
     if ui.verbose:
-        tree = revset.parse(expr)[0]
+        tree = revset.parse(expr)
         ui.note(revset.prettyformat(tree), "\n")
         newtree = revset.findaliases(ui, tree)
         if newtree != tree:

mercurial/hgweb/webcommands.py

@@ -223,7 +223,7 b' def _search(web, req, tmpl):'
 
         revdef = 'reverse(%s)' % query
         try:
-            tree, pos = revset.parse(revdef)
+            tree = revset.parse(revdef)
         except ParseError:
             # can't parse to a revset tree
             return MODE_KEYWORD, query

mercurial/revset.py

@@ -2509,7 +2509,10 b' def foldconcat(tree):'
 
 def parse(spec, lookup=None):
     p = parser.parser(tokenize, elements)
-    return p.parse(spec, lookup=lookup)
+    tree, pos = p.parse(spec, lookup=lookup)
+    if pos != len(spec):
+        raise error.ParseError(_("invalid token"), pos)
+    return tree
 
 def posttreebuilthook(tree, repo):
     # hook for extensions to execute code on the optimized tree
@@ -2521,9 +2524,7 b' def match(ui, spec, repo=None):'
     lookup = None
     if repo:
         lookup = repo.__contains__
-    tree, pos = parse(spec, lookup)
-    if (pos != len(spec)):
-        raise error.ParseError(_("invalid token"), pos)
+    tree = parse(spec, lookup)
     if ui:
         tree = findaliases(ui, tree, showwarning=ui.warn)
     tree = foldconcat(tree)

tests/test-glog.t

@@ -89,7 +89,7 b' o (0) root'
   >         if opts.get('print_revset'):
   >             expr = cmdutil.getgraphlogrevs(repo, pats, opts)[1]
   >             if expr:
-  >                 tree = revset.parse(expr)[0]
+  >                 tree = revset.parse(expr)
   >             else:
   >                 tree = []
   >             ui.write('%r\n' % (opts.get('rev', []),))