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From "Brandon Ballinger (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AVRO-972) Avro IDL compiler should support "NaN", "Infinity", and "-Infinity" as float literals
Date Fri, 09 Dec 2011 20:14:43 GMT

    [ https://issues.apache.org/jira/browse/AVRO-972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166519#comment-13166519
] 

Brandon Ballinger commented on AVRO-972:
----------------------------------------

Thank you!

On Fri, Dec 9, 2011 at 11:00 AM, Doug Cutting (Updated) (JIRA) <


                
> Avro IDL compiler should support "NaN", "Infinity", and "-Infinity" as float literals
> -------------------------------------------------------------------------------------
>
>                 Key: AVRO-972
>                 URL: https://issues.apache.org/jira/browse/AVRO-972
>             Project: Avro
>          Issue Type: Bug
>          Components: java
>    Affects Versions: 1.6.1
>            Reporter: Brandon Ballinger
>            Assignee: Doug Cutting
>            Priority: Minor
>             Fix For: 1.6.2
>
>         Attachments: AVRO-972.patch, AVRO-972.patch, AVRO-972.patch
>
>
> The Avro IDL defines floating point literals as follows:
>   < FLOATING_POINT_LITERAL:
>   ("-")?
>     ( <DECIMAL_FLOATING_POINT_LITERAL> | <HEXADECIMAL_FLOATING_POINT_LITERAL>
)
>   >
> |
>   < #DECIMAL_FLOATING_POINT_LITERAL:
>         (["0"-"9"])+ "." (["0"-"9"])* (<DECIMAL_EXPONENT>)? (["f","F","d","D"])?
>       | "." (["0"-"9"])+ (<DECIMAL_EXPONENT>)? (["f","F","d","D"])?
>       | (["0"-"9"])+ <DECIMAL_EXPONENT> (["f","F","d","D"])?
>       | (["0"-"9"])+ (<DECIMAL_EXPONENT>)? ["f","F","d","D"]
>   >
> |
>   < #DECIMAL_EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+ >
> |
>   < #HEXADECIMAL_FLOATING_POINT_LITERAL:
>         "0" ["x", "X"] (["0"-"9","a"-"f","A"-"F"])+ (".")? <HEXADECIMAL_EXPONENT>
(["f","F","d","D"])?
>       | "0" ["x", "X"] (["0"-"9","a"-"f","A"-"F"])* "." (["0"-"9","a"-"f","A"-"F"])+
<HEXADECIMAL_EXPONENT> (["f","F","d","D"])?
>   >
> |
>   < #HEXADECIMAL_EXPONENT: ["p","P"] (["+","-"])? (["0"-"9"])+ >
> Java allows for "NaN", "Infinity", and "-Infinity" when parsing a Double from a String:
>   http://docs.oracle.com/javase/6/docs/api/java/lang/Double.html#valueOf(java.lang.String)
> The IDL compiler should allow the same set of values as Java Double.valueOf. Among other
things, this would allow "NaN" to be used as a default value for float fields in Avro records.

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