[
https://issues.apache.org/jira/browse/JEXL-114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Henri Biestro updated JEXL-114:
-------------------------------
Description:
WHY:
Not having local variables nor return in scripts is inconvenient, especially
when dealing with loops.
This also precludes using read-only contexts easily which are really convenient
when letting end-users enter their own expressions.
HOW:
This could (will) be implemented by extending the parameters feature (script
accept parameters during parsing and thus arguments during evaluation) which is
itself based on the notion of 'registers' - an array of objects that the
interpreter allocates and uses based on script information.
It only requires adding one keyword ("var" seems the obvious choice) in the
.jjt.
The "return" keyword is also an easy .jjt addition; obvious implementation is
to use an internal exception to force traversing the stack up.
WHAT:
Add the "var" and "return" keyword.
Also add methods to extract the variables (global - see JEXL-113), the
parameters (used during parsing) and the local variables (declared within) a
script to help pinpoint problems or prepare the evaluation of scripts.
was:
Not having local variables in scripts is inconvenient, especially when dealing
with loops.
This also precludes using read-only contexts easily which are really convenient
when letting end-users enter their own expressions.
This could (will) be implemented by extending the parameters feature (script
accept parameters during parsing and thus arguments during evaluation) which is
itself based on the notion of 'registers' - an array of objects that the
interpreter allocates and uses based on script information.
Summary: Allow scripts to create local variables // Add return keyword
(was: Allow scripts to create local variables)
> Allow scripts to create local variables // Add return keyword
> -------------------------------------------------------------
>
> Key: JEXL-114
> URL: https://issues.apache.org/jira/browse/JEXL-114
> Project: Commons JEXL
> Issue Type: Improvement
> Affects Versions: 2.0.1
> Reporter: Henri Biestro
> Assignee: Henri Biestro
> Fix For: 2.0.2
>
>
> WHY:
> Not having local variables nor return in scripts is inconvenient, especially
> when dealing with loops.
> This also precludes using read-only contexts easily which are really
> convenient when letting end-users enter their own expressions.
> HOW:
> This could (will) be implemented by extending the parameters feature (script
> accept parameters during parsing and thus arguments during evaluation) which
> is itself based on the notion of 'registers' - an array of objects that the
> interpreter allocates and uses based on script information.
> It only requires adding one keyword ("var" seems the obvious choice) in the
> .jjt.
> The "return" keyword is also an easy .jjt addition; obvious implementation is
> to use an internal exception to force traversing the stack up.
> WHAT:
> Add the "var" and "return" keyword.
> Also add methods to extract the variables (global - see JEXL-113), the
> parameters (used during parsing) and the local variables (declared within) a
> script to help pinpoint problems or prepare the evaluation of scripts.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
