Extend the comment

[phdru.name/cgi-bin/blog-ru/search-tags.git] / parser / grammar

diff --git a/parser/grammar b/parser/grammar
index 17d3098324c6117c5c509a4c27ece95030766876..5a0c3d53a1a9c8d5f5d270804ed7f3150e0637bc 100644 (file)
--- a/parser/grammar
+++ b/parser/grammar
@@ -3,12 +3,15 @@
 # The grammar defines expressions in the following forms:
 #  TAG - search blog posts that contain the tag;
 #  !TAG - search blog posts that don't contain the tag;
-#  TAG && TAG, TAG & TAG - search blog posts that contain both tags;
+#  TAG & TAG - search blog posts that contain both tags;
 #  TAG | TAG - search blog posts that contain any of the tags;
-# Parentheses are allowed to group expressions:
+# Parentheses are allowed to group expressions; for example:
 #  TAG & (TAG | TAG)
 #  !(TAG | TAG)
-# and so on. This  is a simple version of the grammar and it allows
+# Allowed operators: conjunction - & &&
+#                    disjunction - | ||
+#                    negation    - !
+# This  is a simple version of the grammar and it allows
 # rather stupid expressions, like !!TAG or ((TAG)); in the future
 # it will be fixed by making the grammar more complex and stricter.
 
@@ -25,6 +28,7 @@ SP1 : '[ \t]+'
 expression : NAME
            | expression AND_OP AND_OP expression
            | expression AND_OP expression
+           | expression OR_OP OR_OP expression
            | expression OR_OP expression
            | NOT_OP expression
            | '(' expression ')'