line
: (r+=ruleLine | z+=zoneLine | l+=linkLine | NEWLINE!)* -> $r+ $z+ $l+
;
:)
Ter
On Dec 22, 2010, at 2:59 PM, Christopher Hunt wrote:
> Hi there,
>
> I'm putting the final touches to my parser of Zoneinfo (1) files and haven't
> been able to solve the last part of the puzzle: how to group a set of AST
> nodes such that I can ensure the order by which nodes are processed in the
> tree grammar. The parser grammar I have should explain better:
>
> line
> : (ruleLine | zoneLine | linkLine | NEWLINE!)*
> ;
>
> ruleLine
> : 'Rule' ruleName ruleFrom ruleTo ruleType ruleIn ruleOn ruleAt
> ruleSave ruleLetters NEWLINE!
> ;
>
> zoneLine
> : 'Zone' zoneName zoneGmtOffset zoneRules zoneFormat
> (zoneUntil (NEWLINE+) zoneGmtOffset zoneRules zoneFormat)*
> NEWLINE
> -> 'Zone' zoneName zoneGmtOffset zoneRules zoneFormat
> (zoneUntil 'Zone' zoneName zoneGmtOffset zoneRules zoneFormat)*
> ;
>
> linkLine
> : 'Link' linkFrom linkTo NEWLINE!
> ;
>
> In essence, I need to group all of the rule lines together, and all of the
> zone lines together so that all rules are processed by my tree grammar first,
> then all zones are processed and finally all links are processed. This is
> because zones reference rules and links reference zones.
>
> Zoneinfo source files can have rules, zones and links appear in any order
> hence my need to ensure that the AST outputs rules first then zones then
> links.
>
> I was thinking that referencing a previous rule as described in Terence's
> book on p174 was the way to go, but I've not been able to make that work.
>
> All help appreciated.
>
> Kind regards,
> Christopher
>
> (1) http://en.wikipedia.org/wiki/Tz_database
>
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