I’ve been busy extending AntlrVSIX to include new features and correct bugs. Some of the things added with the 40 or so changes since the beginning of September are:<\/p>\n\n\n\n
<\/p>\n\n\n\n
What is more important is that I’ve been settling on how to write attribute evaluation for the parse tree using Antlr’s Listener pattern, using a symbol table on the Java parse tree. If done in an unstructured, undisciplined, and ill informed manner, the code could become quite disastrous.<\/p>\n\n\n\n
For example, I looked for “listeners in parse tree traversal” and Google Search found in the top answers Saumitra’s blog<\/a>, Jakub Dziworski’s blog<\/a>, MIT OpenCouseWare page on Antlr<\/a>, Positive Technoligies page on Antlr<\/a>, but there is no discussion of how this framework would be used in attribute evaluation, which is discussed nicely in these lecture notes<\/a>. As I’m not that disciplined to write a system to declare the formal semantic equations and an evaluator of those equations, I’ve settled to make sure to try to set attributes for a node within the node’s listener (either “enter” or “exit”). Otherwise, I wouldn’t know which listener is setting what attribute for a node. This is “basic” compiler stuff, but “basic” information gets lost when people start using these tools.<\/p>\n\n\n\n All this is important, and will be eventually applied to the Piggy transformation system<\/a>.<\/p>\n\n\n\n More folks seem to be using it, maybe because there is a link from the Antlr.org developer page<\/a> to the extension<\/a>.<\/p>\n\n\n\n –Ken<\/p>\n","protected":false},"excerpt":{"rendered":" I’ve been busy extending AntlrVSIX to include new features and correct bugs. Some of the things added with the 40 or so changes since the beginning of September are: Persistent option settings; Tagging of Java symbols using a symbol table; Improved reformatter for languages; Improved symbol click-on highlighter; Improved co-existence with other extensions.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/posts\/2259"}],"collection":[{"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/comments?post=2259"}],"version-history":[{"count":0,"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/posts\/2259\/revisions"}],"wp:attachment":[{"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/media?parent=2259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/categories?post=2259"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/165.227.223.229\/index.php\/wp-json\/wp\/v2\/tags?post=2259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}