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Posted to dev@velocity.apache.org by "Nathan Bubna (JIRA)" <ji...@apache.org> on 2005/09/19 03:44:54 UTC
[jira] Commented: (VELOCITY-253) Enhance whitespace gobbling
[ http://issues.apache.org/jira/browse/VELOCITY-253?page=comments#action_12329754 ]
Nathan Bubna commented on VELOCITY-253:
---------------------------------------
Yes, a configuration switch is pretty much impossible if you treat any whitespace outside VTL constructs as special. this is one of my arguments for no-gobbling. see the last section of http://wiki.apache.org/jakarta-velocity/VelocityWhitespaceGobbleNone for more on it. if the parser does gobbling, then our ability to configure gobbling rules becomes severly reduced. perhaps i'll have to dig up some time to up the ante and produce a no-parser-gobbling patch for a post-1.5 release.
> Enhance whitespace gobbling
> ---------------------------
>
> Key: VELOCITY-253
> URL: http://issues.apache.org/jira/browse/VELOCITY-253
> Project: Velocity
> Type: Wish
> Components: Source
> Versions: 1.0-Release
> Environment: Operating System: other
> Platform: Other
> Reporter: Christoph
> Fix For: 2.0
>
> I expect that when adding velocity markup to an existing text file
> to not affect the spacing in the output. This includes indented #foreach
> directives and inner indented #if/#set/#macro directives.
> So the rule I proposed was to allow adding velocity markup, one per line,
> and still have the same output - e.g. add an #if statement around
> existing text to conditionally mask it out. Or add an #foreach around
> a table row and be able to repeat the body with dynamic data, etc.
> As sonn as a directive is placed wihtin other text in the same line,
> any whitespace around it should remain untouched.
> If a line is looks like this:
> DirectiveLine ::= LineEnd TabsAndSpaces? Directive TabsAndSpaces? LineEnd
> TabsAndSpaces ::= (#x20 | #x09)+
> LineEnd ::= StartOfStream | ((#x0D #x0A) | #x0D | #x0A) | EndOfStream
> then the first "TabsAndSpaces?" and the closing "TabsAndSpaces? LineEnd"
> should be gobbled. (Note that it supports multiline directives, that is
> why "DirectiveLine" is not simply "Line".) If you whant the first
> "LineEnd" to be gobbled prepend a ## before it (makes the EOL part of
> the previous line!).
> This has been an isse since velocity birth and discussed in many
> user and developer threads. Some users agree with my proposals,
> some say that velocity sould not touch any whitespaces and a
> code formatter should be run after the template rendering.
> The proposal is not 100% BC, but a switch could allow the classic
> style (by default), or to pass all whitespaces.
> A new directive could be created to control the gobbling for
> the enclosed parts within a template.
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