X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?p=forth.jl.git;a=blobdiff_plain;f=README.md;h=c213372e1fbbadef79ed4c16589545ee783875a8;hp=402d64ce6b35cfec10cef4bd7de211eb8a1bb826;hb=698e6c176256cd3b3a4fa8a647feec57db3a8c14;hpb=2037d213693085e5b2107d6ef6a723430815d4da diff --git a/README.md b/README.md index 402d64c..c213372 100644 --- a/README.md +++ b/README.md @@ -10,11 +10,11 @@ project [JonesForth] (https://rwmj.wordpress.com/2010/08/07/jonesforth-git-repos which was an amazing read. To a large degree my package is simply a port of that project from x86 assembly + forth to julia + forth, although the mapping is in a few places non-trivial due to the fact that julia is a high level -language. A huge proportion (say 80%) of the library code in src/lib.4th is -directly copied from JonesForth. (The fact that it was possible to reuse this -code was satisfying in its own right!) I've added some additional core -definitions and modified some of the others with the eventual aim of F83 -compliance (discussed below). +language. During the bootstrapping process, a huge proportion (say 80%) of the +library code in src/lib.4th was directly copied from JonesForth. (The fact +that it was possible to reuse this code was satisfying in its own right!) Since +that time I've added a significant number of core definitions and modified some +of the others with the eventual aim of F83 compliance (discussed below). There's quite a lot to say about the implementation, especially due to its high-level grounding, but that will have to wait for another time. @@ -41,12 +41,12 @@ the library file. Once this is complete you can start entering forth commands: star * ok There's an example Mandelbrot Set drawing program included in the examples -directory. To run it, you'll have to locate this directory on your system (its -location depends on what OS you happen to be using and how julia is installed). -Once found, use the `INCLUDE` word to compile its definitions. For example, on -my system I can run the example in this way: +directory. To run it, use the `INCLUDE` word to open the file and compile its +definitions. Although the exact location of the examples directory in your +filesystem is platform dependent, `INCLUDE` includes the forth.jl src/ directory +in its search path so the following should always work: - include /home/tim/.julia/v0.4/forth/examples/mandelbrot.4th + include ../examples/mandelbrot.4th Enter 'mandel' to draw the Mandelbrot Set. ok mandel * @@ -90,17 +90,10 @@ as makes sense given the underlying VM. (Actually, my main goal goes a bit beyond this: I want to be able to, with a couple of exceptions, be compatible with the description of forth contained in the second edition of Leo Brodie's book "Starting Forth".) I'm fairly happy with my progress so far. Of the -131 required F83 words, only 26 remain unimplemented. These words fall into -three categories: those I intend to implement in the near future, those I may -possibly implement at some point, and those that I do not intend to ever implement -for reasons of obsolescence or incompatibility with the design of the VM. - -### F83 Words to be implemented soon - - PAD ABORT" CMOVE> VOCABULARY DEFINITIONS FORTH - -User-defined vocabularies aren't in there yet but this should be easy to solve. -`PAD`, `ABORT` and `CMOVE>` are simple oversights. +131 required F83 words, only 20 remain unimplemented. These words fall into +two categories: those I may possibly implement at some point, and those that I +do not intend to ever implement for reasons of obsolescence or incompatibility +with the design of the VM. ### F83 Words that may be implemented someday @@ -115,7 +108,7 @@ not been interested in enough yet to get on top of. SAVE-BUFFERS UPDATE BLK HOLD LOAD FORTH-83 These words don't make sense to implement. The double-length integer words are -useless, because the smallest unit of memory in our VM is a full 64 bit +useless because the smallest unit of memory in our VM is a full 64 bit integer. For the same reason, there's no point in dealing with unsigned values just to gain access to another bit. The block I/O words don't make sense because we have access to a filesystem via the OS.