Hi Kasper, if you are just interested in parsing it, I would hand write the parser. It seems to be very simple. Even if you need EMF models implementing a Resource for that format would be what I do. But if you want to leverage linking, or even have an editor an Xtext grammar might be worthwhile. Please let me know if that is the case and I'll try to give further advice.
Sven 2016-06-20 20:36 GMT+02:00 kaspergam <[email protected]>: > I am an intern working on the Eclipse Advanced Visualization Project > (EAVP), and we are using Xtext to parse files and import them into our data > structures. Using Xtext, I was able to fairly easily accomplish this task > with STL files STL (file format) - Wikipedia, the free encyclopedia > <https://en.wikipedia.org/wiki/STL_(file_format)>. This is because STL > has keywords followed by data, which is a simple Xtext grammar to write. > > > [image: image] <https://en.wikipedia.org/wiki/STL_(file_format)> > > > > > > STL (file format) - Wikipedia, the free encyclopedia > <https://en.wikipedia.org/wiki/STL_(file_format)> > STL (STereoLithography) is a file format native to the stereolithography > CAD software created by 3D Systems.[1][2][3] STL has several after-the-fact > backronyms such... > View on en.wikipedia.org <https://en.wikipedia.org/wiki/STL_(file_format)> > Preview by Yahoo > > However, we are now focusing on IGES (Initial Graphics Exchange > Specification) geometry files, which are not as easy to parse. The IGES > files are ASCII records with 80 characters per line. These lines need to be > split by either length (in characters) or by a delimiter. It seems > difficult to get Xtext to read in files line by line or even character by > character. More information on IGES can be found here: IGES - Wikipedia, > the free encyclopedia <https://en.wikipedia.org/wiki/IGES> > > > [image: image] <https://en.wikipedia.org/wiki/IGES> > > > > > > IGES - Wikipedia, the free encyclopedia > <https://en.wikipedia.org/wiki/IGES> > The Initial Graphics Exchange Specification (IGES) (pronounced eye-jess) > is a vendor-neutral file format that allows the digital exchange of > information among compu... > View on en.wikipedia.org <https://en.wikipedia.org/wiki/IGES> > Preview by Yahoo > > The main difficulty is deciding the type of line the parser is currently > reading. There are sections to the file, and the current section is > specified by the 73rd character per line. I cannot find a way to easily > read this character before starting to parse the rest of the line. For > example, here is the file on the Wikipedia page: > > S > 1 > 1H,,1H;,4HSLOT,37H$1$DUA2:[IGESLIB.BDRAFT.B2I]SLOT.IGS;, G > 1 > 17HBravo3 BravoDRAFT,31HBravo3->IGES V3.002 (02-Oct-87),32,38,6,38,15, G > 2 > 4HSLOT,1.,1,4HINCH,8,0.08,13H871006.192927,1.E-06,6., G > 3 > 31HD. A. Harrod, Tel. 313/995-6333,24HAPPLICON - Ann Arbor, MI,4,0; G > 4 > 116 1 0 1 0 0 0 0 1D > 1 > 116 1 5 1 0 0D > 2 > 116 2 0 1 0 0 0 0 1D > 3 > 116 1 5 1 0 0D > 4 > 100 3 0 1 0 0 0 0 1D > 5 > 100 1 2 1 0 0D > 6 > 100 4 0 1 0 0 0 0 1D > 7 > 100 1 2 1 0 0D > 8 > 110 5 0 1 0 0 0 0 1D > 9 > 110 1 3 1 0 0D > 10 > 110 6 0 1 0 0 0 0 1D > 11 > 110 1 3 1 0 0D > 12 > 116,0.,0.,0.,0,0,0; 1P > 1 > 116,5.,0.,0.,0,0,0; 3P > 2 > 100,0.,0.,0.,0.,1.,0.,-1.,0,0; 5P > 3 > 100,0.,5.,0.,5.,-1.,5.,1.,0,0; 7P > 4 > 110,0.,-1.,0.,5.,-1.,0.,0,0; 9P > 5 > 110,0.,1.,0.,5.,1.,0.,0,0; 11P > 6 > S 1G 4D 12P 6 T > 1 > > Here I need to skip the S and G rows, and after that read each number from > the D rows into fields- every 8 characters holds a record (after removing > white-space). The P rows need to be read in as comma separated values, where > the last bit (#P #) is ignored. This is only a primitive parse of this > file, but still good enough to read in the critical data. Do you think Xtext > will be helpful or even usable to parse this kind of file? What kind of > grammar could we write to handle these problems? Any help would be > appreciated! > > Thank you so much, > Kasper Gammeltoft > Oak Ridge National Laboratory, > Computer Science and Mathematics Division, > Computer Science Research Group > (865)-696-6625 > [email protected] > > > _______________________________________________ > xtext-dev mailing list > [email protected] > To change your delivery options, retrieve your password, or unsubscribe > from this list, visit > https://dev.eclipse.org/mailman/listinfo/xtext-dev >
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