[Mapcss] URL specifiers

Thomas Davie tom.davie at gmail.com
Sun Mar 20 11:54:35 GMT 2011

Hi all,

I just noticed that the MapCSS 0.2 wiki seems to state that properties specified by URLs should take this form:

icon-image: url/goes/here.png;

I'd like to propose changing to this instead:

icon-image: url('url/goes/here.png');

For two reasons:

1) It agrees with the CSS spec.
2) It's much easier to parse.  Under the old scheme, either the tokeniser would output something like <identifier 'url'> <symbol '/'> <identifier 'goes'> <symbol '/'> <identifier 'here'> <symbol '.'> <identifier 'png'>, and the parser would have to have a magic rule along the lines of "consume everything up to the <symbol ';'> and smush it together into a string"; or the tokeniser would have to be aware of the state of the parser, and produce a <string 'url/goes/here.png'> token instead of the above iff the parser is in this state.  Both these solutions seem comparatively ugly, compared to the CSS solution, which allows for a simple BNF rule:

<url> ::= "url" "(" <quotedString> ")"

Would appreciate any comments.


Tom Davie

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