dcim 2.0.0

dc improved - Expanded rewrite of a classic RPN calculator / esoteric programming language
Documentation 
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dc improved - Expanded rewrite of a classic RPN calculator / esoteric programming language

This readme only mentions changes compared to GNU dc. If you're unfamiliar with its core principles, read its man page or the Wikipedia article.

Complete documentation in the wiki

Building

(Assuming complete and up-to-date Rust environment)

In general

cargo install dcim

Windows

gmp-mpfr-sys requires some extra setup, follow the instructions here. After building it in MinGW once, new dc:im versions can be built normally until I update it to a new version of gmp-mpfr-sys.

Note: Numbers with huge mantissae (W≥2³⁰) cause crashes for some arcane internal reason I can't control. If you want to calculate something to a billion digits, use WSL.

Android (Termux)

This seems to be required for Rust in general:

export RUSTFLAGS=" -C link-arg=$(clang -print-libgcc-file-name)"

Install:

MAKEFLAGS="-i" cargo install dcim

The current version of GNU MPFR fails one inconsequential test (no idea why), use -i to pretend it doesn't happen.

Most important changes compared to GNU dc

  • Expanded shell argument syntax, run dcim -h to learn more.
  • Default (interactive/shell) mode now has a prompt indicator.
  • Error messages are much more helpful and differentiated, and are always prefixed with ! .
  • When type/semantic errors occur, all used objects are returned to the stack.
  • Commands for multithreaded macro execution.
  • Numbers are binary floats with user-changeable precision (W). The parameter K only applies to output.
  • Commands that need integers round numbers towards zero (discarding the fractional part).
  • Strings have full Unicode support (stored in UTF-8).
  • Several new arithmetic and string manipulation commands.
  • Niladic (non-popping) printing commands print brackets around strings for clarity.
  • Number input/output bases are unlimited upwards, bases above 36 use a custom "any-base" notation.
  • The amount of available registers is unlimited.
  • Arbitrary registers can be selected with a "register pointer" command.
  • A library of various named constants and unit conversion factors.

Using dc:im in your code

  • Create a state storage struct (State::default()).
  • Create a set of IO streams (IOTriple).
    • The macro stdio! creates a set that uses standard input, output and error.
  • Execute commands with exec.
  • Example:
use dcim::*;
let mut state = State::default()  //create state storage
let mut io = stdio!();    //will print to console
let _ = exec(&mut state, Some(&mut io), true, "@9w[pi]\"p");  //calculate π to 1 billion bits, print