{"id":256,"date":"2009-11-10T21:27:11","date_gmt":"2009-11-10T20:27:11","guid":{"rendered":"http:\/\/floris.briolas.nl\/floris\/?p=256"},"modified":"2009-11-10T21:28:20","modified_gmt":"2009-11-10T20:28:20","slug":"ambiguity-lexer-rules","status":"publish","type":"post","link":"https:\/\/floris.briolas.nl\/floris\/2009\/11\/ambiguity-lexer-rules\/","title":{"rendered":"Ambiguity: Lexer rules"},"content":{"rendered":"

How to handle ambiguous rules?<\/p>\n

Remember the “The following token definitions can never be matched because prior tokens match the same input”<\/a>. <\/p>\n

If you’ll like to match “INT” as a token and a bunch of other chars as another token. <\/p>\n

WRONG!<\/p>\n

\r\nID \t:\t('a'..'z'|'A'..'Z')+;\r\nTYPE \t:\t'INT';\r\n<\/pre>\n
RIGHT!<\/p>\n
\r\nTYPE \t:\t'INT';\r\nID \t:\t('a'..'z'|'A'..'Z')+;\r\n<\/pre>\n
But this comes with consequences. There is NO WAY ID could be matched with ‘INT’ as a value, since that will match to the TYPE rule. <\/p>\n
Now here is why that may not matter…
\na function header in C# :<\/p>\n
public int int (string string, object object)<\/p><\/blockquote>\n
“,.. well if you know C# or JAVA,, you’ll see that this is not a problem…<\/p>\n
But it just might be a problem for you.<\/p>\n
I’m a C# developer,.. and C# solves this ambiguity with a ‘@<\/strong>‘.
\nlike so:<\/p>\n
public static void @static(int @int, object @new, float @const)<\/p><\/blockquote>\n
This is of course not the final word on this topic..  I’ll post more here.. I’t would help if you’ll post a comment like hurry up already.. \ud83d\ude42<\/p>\n
cheers.<\/p>\n","protected":false},"excerpt":{"rendered":"
How to handle ambiguous rules? Remember the “The following token definitions can never be matched because prior tokens match the same input”. If you’ll like to match “INT” as a token and a bunch of other chars as another token. WRONG! ID : (‘a’..’z’|’A’..’Z’)+; TYPE : ‘INT’; RIGHT! TYPE : ‘INT’; ID : (‘a’..’z’|’A’..’Z’)+; But […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_newsletter_tier_id":0,"jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[3],"tags":[6],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p61yPs-48","_links":{"self":[{"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/posts\/256"}],"collection":[{"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/comments?post=256"}],"version-history":[{"count":10,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/posts\/256\/revisions"}],"predecessor-version":[{"id":315,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/posts\/256\/revisions\/315"}],"wp:attachment":[{"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/media?parent=256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/categories?post=256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/floris.briolas.nl\/floris\/wp-json\/wp\/v2\/tags?post=256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}