On Wed, Aug 30, 2023, at 5:48 AM, Richard wrote: > Hi, > > So the symbols parser is an example of a dynamic parser in X3. I am trying to > write a parser for a GIF image file. A GIF file is a series of chunks. > Chunks > are prefixed with a length indicating the number of bytes in the chunk. Many > binary formats have the length of a binary block encoded in the stream > followed > by <length> bytes (or words or whatever unit) representing the block. > > How do we parse this using X3 spirit?
I did a dynamic repeat parser back when: https://stackoverflow.com/questions/33624149/boost-spirit-x3-cannot-compile-repeat-directive-with-variable-factor/33627991#33627991 > > Do we use a success handler for the length to record it in the context and > then > somehow use a repeat parser that grabs the repeat count from the context? > What, exactly, does that look like? That's a variation. In reality, I'd probably make a parser type - I think it was discussed in the comments there too https://stackoverflow.com/questions/33624149/boost-spirit-x3-cannot-compile-repeat-directive-with-variable-factor/33627991#comment55039410_33624149 > > I'm hoping to figure this out in time for a presentation on X3 to Utah C++ > Programmers on Sept. 13th. Apropos of nothing, there's a building block to get /anything/ lazily parsed: https://stackoverflow.com/questions/60171119/boost-spirit-x3-lazy-parser/60176802#60176802 Good luck with the presentation, and have fun! Seth _______________________________________________ Spirit-general mailing list Spirit-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/spirit-general
