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
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