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https://issues.apache.org/jira/browse/SHINDIG-1137?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacky Wang updated SHINDIG-1137:
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Attachment: expression_lexer.patch
This patch implemented a clearly support for its evaluating.
Basically, it contains 3 parts:
1) ExpType, it defines types like int / float / string / bool / array / object
etc. and handles the type coercing as well.
2) ExpLexer, which tokenizes the input expression string into intermediate
tokens which will be handled in the later stage.
3) ExpParser, which evaluates the input token stream under a given data context.
Excepts the functionalities like operation computing, function calls etc, the
capability of input expression validation is also provided. Unit-tests are
included, too.
Some highlights of this parser:
1) handles tricky string in the right way, e.g. 'this is \\\'"the tricky
string"\''
2) scientific floating parsing, e.g. .5e-3
3) nested unary operator, e.g. 5+---0.2e-3+1
4) nested ternary, e.g. a?b:c?d:e / a?(b?c:d):e
5) scoped variable: no_prefix, Cur, Top
6) access un-exist attribute should return null (it's different with JSP EL's
spec)
7) nested attribute access: a[b].c
code review sees here: http://codereview.appspot.com/98112
> Implement the Expression evaluator for JSP EL-like OpenSocial Template
> language
> -------------------------------------------------------------------------------
>
> Key: SHINDIG-1137
> URL: https://issues.apache.org/jira/browse/SHINDIG-1137
> Project: Shindig
> Issue Type: Improvement
> Components: PHP
> Environment: N/A
> Reporter: Jacky Wang
> Priority: Critical
> Attachments: expression_lexer.patch
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> The expression language used in OpenSocial templating system is a JSP EL-like
> one. We need a EL evaluator which could do the following items correctly:
> 1) number / boolean operation
> 2) function calls
> 3) string handling
> 4) ternary conditional workflow
> 5) data context de-reference
> 6) nested structures
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