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https://issues.apache.org/jira/browse/VELOCITY-542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16624383#comment-16624383
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Nate Chadwick commented on VELOCITY-542:
----------------------------------------
Here is an example that is close to solving the $variable-1 issue that
[~spbolton] has been hacking on:
{code}
<#ALPHA_CHAR: ["a"-"z", "A"-"Z", "_" ] >
| <#ALPHA_NUM_CHAR: [ "a"-"z", "A"-"Z", "_" "0"-"9" ] >
| <#IDENTIFIER_CHAR: [ "a"-"z", "A"-"Z", "0"-"9", "_" ] >
| <#IDENTIFIER_DASH: [ "-" ] >
| <#IDENTIFIER_CHAR: [ "a"-"z", "A"-"Z", "0"-"9", "-", "_" ] >
| <IDENTIFIER: ( <ALPHA_CHAR> ) ((<IDENTIFIER_DASH> <ALPHA_CHAR>) |
(<ALPHA_NUM_CHAR>))*) >``
{code}
One of the problems with this approach that still needs addressed is handling
something like:
{code}
$velo-Var--897
{code}
Which may be handleable by making -- an Operator that equates to + (had to
remember 5th grade math for that!).
Would really appreciate a re-open so that we can solve this in a way that you
have 1 parser and don't need to eliminate - as a valid character in language
identifiers. I don't have permissions to reopen a closed bug.
The correct fix just needs more work and testing.
> minus sign in #set requires spaces to surround it
> -------------------------------------------------
>
> Key: VELOCITY-542
> URL: https://issues.apache.org/jira/browse/VELOCITY-542
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.5
> Reporter: Will Glass-Husain
> Assignee: Claude Brisson
> Priority: Minor
> Fix For: 2.0
>
>
> The following example:
> #set($thisCampNumber = 10)
> #set($nextCampNumber = $thisCampNumber+1)
> #set($previousCampNumber = $thisCampNumber-1)
> #set($previousCampNumberB = $thisCampNumber - 1)
> 1: $thisCampNumber<br>
> 2: $nextCampNumber<br>
> 3: $previousCampNumber<br>
> 4: $previousCampNumberB<br>
> produces this result
> 1: 10
> 2: 11
> 3: $previousCampNumber
> 4: 9
> Note that using a minus sign in a #set statement does not work if there are
> no spaces around it. (however, the same is not true for +).
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