Manlio Perillo ha scritto:
Manlio Perillo ha scritto:
Hi.
I'm starting to write a CSS parser with Alex and Happy. The grammar is defined here: http://www.w3.org/TR/CSS21/grammar.html
However I have noted that there are some difference in the syntax between Alex and Flex? What is the rationale?
One more thing. Here: http://www.haskell.org/alex/doc/html/alex-files.html it seems that there is an error with macrodef := @smac '=' set | @rmac '=' regexp
it should be macrodef := $smac '=' set | @rmac '=' regexp
Ok, this is not an error, sorry.
By the way, here is the list of differences between Alex and Flex I have found, for people interested:
[...]
Another problem. In this rule: @comment = \/\*[^\*]*\*+([^\/\*][^\*]*\*+)*\/ [^\*] means "all characters except '*'", but Alex seems to not include the new line character. So a comment like /* A comment */ generates a lexical error. Is this true? Thanks Manlio Perillo