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From "Ji-Hyun Oh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-1634) Detecting problem with Matlab source code
Date Tue, 02 Jun 2015 22:13:49 GMT

    [ https://issues.apache.org/jira/browse/TIKA-1634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569853#comment-14569853
] 

Ji-Hyun Oh commented on TIKA-1634:
----------------------------------

As Matlab code has somewhat free starting format, it could have various types other than 'function'
and '%'.  Fortunately(?), most of Matlab files seem to start with either 'function' or '%'.
 However, there exist several exception, for instance, attached 'Initial_Vals_Maker.m' file
starts with '%%'. This feature has not been addressed in tika-mimetypes.xml 

> Detecting problem with Matlab source code
> -----------------------------------------
>
>                 Key: TIKA-1634
>                 URL: https://issues.apache.org/jira/browse/TIKA-1634
>             Project: Tika
>          Issue Type: Improvement
>          Components: mime
>    Affects Versions: 1.8
>            Reporter: Ji-Hyun Oh
>            Priority: Trivial
>         Attachments: BARCAST_MainCode.m, Initial_Vals_Maker.m, custom-mimetypes.xml,
wtsgaus.m
>
>
> Both Matlab source code and Objective-C source code have the same suffix, which is .m.
Therefore, Matlab has additional match value in mime types.xml. 
> In tika-mimetypes.xml Matlab is defined as:
>   <mime-type type="text/x-matlab">
>     <_comment>Matlab source code</_comment>
>     <magic priority="50">
>       <match value="function [" type="string" offset="0"/>
>     </magic>
>     <!-- <glob pattern="*.m"/> - conflicts with text/x-objcsrc -->
>     <sub-class-of type="text/plain"/>
>   </mime-type>
> However, Matlab codes does not always start with "function [“. Therefore, some Matlab
codes are detected as text/x-bojcsrc. Based on the source codes collected from NOAA Paleoclimatology
Software Resources, many Matlab codes have match value like these (problematic files are attached
as an example):
> <mime-type type="text/x-matlab">
>     <_comment>Matlab source code</_comment>
>     <magic priority="50">
>       <match value="function" type="string" offset="0"/>
>       <match value="%" type="string" offset="0"/>
>     </magic>
>     <!-- <glob pattern="*.m"/> - conflicts with text/x-objcsrc -->
>     <sub-class-of type="text/plain"/>
>   </mime-type>
> Conducted several detecting tests by using different Matlab packages obtained from NOAA
Paleoclimatology Software Resources, with/without Custom-mimtypes.xml. Results are attached.
As a results, total 103 Matlab files are detected correctly with custom-mimetypes.xml, while
 42 Matlab files are detected as Matlab files without custom-mimetypes.xml (= only with current
match value). However, this match value for Matlab source code could be only common in Paleoclimatology
community. 



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