Examine individual changes

''''MagiStack''' is a [[stack]]-based [[esoteric programming language]] created by [[User:KatrinaKitten|Katrina Scialdone]]. It is based loosely on [[Unefunge]] (a one-dimensional offshoot of [[Befunge]]) and uses some similar or identical commands. It is no longer in development as of version 1.2. ==Commands== In MagiStack, each character is a command. Any unrecognized characters are ignored. Line breaks and tabs are stripped from the program before execution.<br> Commands may be clarified in this table by parenthesized pseudocode; each value used from the stack used will be represented by a letter, starting from "a". {| class="wikitable" !Command !Version Added !Description |- |<code>0-9</code> |v1.0 |Pushes the number's value to the stack |- |<code>+</code> |v1.0 |Pops the top two values from the stack and pushes the sum (a+b) |- |<code>-</code> |v1.0 |Pops the top two values from the stack and pushes the difference (b-a) |- |<code>*</code> |v1.0 |Pops the top two values from the stack and pushes the product (a*b) |- |<code>/</code> |v1.0 |Pops the top two values from the stack and pushes the quotient (b/a) |- |<code>%</code> |v1.0 |Pops the top two values from the stack and pushes the remainder (b%a) |- |<code>!</code> |v1.0 |Pops the top value from the stack and pushes the inverse (!a>0) |- |<code>`</code> |v1.0 |Pops the top two values from the stack and pushes whether (b>a) |- |<code>:</code> |v1.0 |Duplicates the top value from the stack |- |<code>\</code> |v1.0 |Swaps the top two values from the stack |- |<code>$</code> |v1.0 |Pops the top value from the stack and discards it |- |<code>.</code> |v1.0 |Pops the top value from the stack and outputs it as an integer |- |<code>,</code> |v1.0 |Pops the top value from the stack and outputs it as the ASCII character its value represents (in range 0-127) |- |<code>=</code> |v1.0 |Pops the top two values from the stack and skips the next character (Note: includes non-command characters! Be careful!) if they are not equal |- |<code>#</code> |v1.0 |Skips forward to the next occurence of #, &#124;, or ], or the end of the program |- |<code>@</code> |v1.0 |Skips backward to the last occurence of @, &#124;, or ], or the beginning of the program |- |<code>]</code> |v1.0 |Terminates forward skipping (Note: # can be used, but it risks starting an unintended skip, especially with conditionals; &#124; can be used, but is not direction-dependent) |- |<code>[</code> |v1.0 |Terminates backward skipping (Note: @ can be used, but it risks starting an unintended skip, especially with conditionals; &#124; can be used, but is not direction-dependent) |- |<code>&#124;</code> |v1.0 |Terminates skipping in either direction (Note: see #, @, [, and ] to see other options and direction-dependency) |- |<code>?</code> |v1.1 |Pushes the size of the stack onto the stack (i.e. [3,2,1] -> [3,2,1,3]) |- |<code>^</code> |v1.1 |Waits for input, then pushes it onto the stack as a signed integer (pushes 0 on invalid input) |- |<code>&</code> |v1.1 |Waits for input, then pushes it onto the stack as ASCII values (pushes each character separately) |- |<code>_</code> |v1.1 |Exits the program |- |<code>"</code> |v1.2 |Enters string mode until the next occurrence of "; while in string mode, each character will be pushed as an ASCII value |- |<code>{</code> |v1.2 |Pops an integer from the stack and pushes each digit in it as an ASCII value |- |<code>&gt;</code> |v1.2 |Skips to the final occurrence of &#124;, or to the end of the program |- |<code>&lt;</code> |v1.2 |Skips to the first occurrence of &#124;, or to the start of the program |- |<code>~</code> |v1.2 |Reverses the stack (i.e. [3,2,1] -> [1,2,3]) |- |<code>;</code> |v1.2 |Pops the bottom value off the stack and pushes it on top (i.e. [3,2,1] -> [2,1,3]) |- |} ==Computational class== As MagiStack's memory is only limited by its implementation (rather than by the language itself), it is possible that it is [[Turing-complete]]. However, versions up to v1.1 have been proven to almost certainly not be Turing-complete, and beyond that have not been definitively proven or disproven. ==Examples== Note that these example programs may not be the most efficient implementation possible (and probably aren't). ===[[Hello, world!]]=== v1.0: <pre class="rectwrap">89*,25*2*5*1+,25*2*5*8+,25*2*5*8+,25*2*5*9+2+,92+4*,48*,96+8*1-,25*2*5*9+2+,25*2*5*9+5+,25*2*5*8+,25*2*5*,92+3*,</pre> v1.1: <pre class="rectwrap">33687682798732447976766972|\91+*+,?0=#@|</pre> v1.2+: <pre class="rectwrap">"Hello, world!"~|,?0=#@</pre> ===[[99 bottles of beer]]=== v1.0+: <pre class="rectwrap">91+:*|1-::::::::.48*,92+6*,91+8*1-,91+8*4+:,,91+8*4-,91+7*1-,1=#91+8*3+,]48*,91+8*1-,91+7*,48*,92+6*,91+7*1-:,,91+8*2+,48*,91+8*1-,91+8*2-,48*,91+8*4+,91+7*2+,91+7*1-,48*,91+9*3-,91+6*5+,91+8*4-:,,92+4*,91+,.48*,92+6*,91+8*1-,91+8*4+:,,91+8*4-,91+7*1-,1=#91+8*3+,]48*,91+8*1-,91+7*,48*,92+6*,91+7*1-:,,91+8*2+,92+4*,91+,91+8*4+,91+6*5+,91+7*5+,91+7*1-,48*,91+8*1-,91+8*2-,91+7*1-,48*,91+7*2-,91+8*1-,91+9*3-,91+8*2-,92+4*,48*,91+,91+8*,91+6*5+,91+8*3+:,,48*,91+7*3+,91+8*4+,48*,91+6*5+,91+8*2+,91+8*1-,91+8*5+,91+8*2-,91+7*2-,92+4*,91+,1=#1-.#91+8*2-:,1+,]48*,92+6*,91+8*1-,91+8*4+:,,91+8*4-,91+7*1-,2=#91+8*3+,]48*,91+8*1-,91+7*,48*,92+6*,91+7*1-:,,91+8*2+,48*,91+8*1-,91+8*2-,48*,91+8*4+,91+7*2+,91+7*1-,48*,91+9*3-,91+6*5+,91+8*4-:,,91+4*6+,91+:,,1=#@|</pre> v1.2+: <pre class="rectwrap">91+:*|1-:{" bottle"~:~;1=#"s"|" of beer on the wall,"91+~:~;{" bottle"~:~;1=#"s"|" of beer,"91+"Take one down, pass it around,"91+~:~;1-:0=#{#$"No more"|" bottle"~:~;1-1=#"s"|" of beer on the wall."91+:;~|,?1=#@|:1=#<</pre> ===[[Factorial]]=== v1.0+: <pre class="rectwrap">78\91+*+,85\91+*+,77\91+*+,66\91+*+,69\91+*+,82\91+*+,58\91+*+,48*,^:1`1=#_|:1-:1=#@|*?1=#@|70\91+*+,65\91+*+,67\91+*+,84\91+*+,79\91+*+,82\91+*+,73\91+*+,65\91+*+,76\91+*+,58\91+*+,48*,.</pre> Raw version (no input prompt, number is hardcoded at beginning of program): <pre class="rectwrap">5:1`1=#_|:1-:1=#@|*?1=#@|.</pre> ===[[Cat program]]=== v1.2+: <pre class="rectwrap">&~|,?0=#@</pre> ==External resources== * [https://github.com/tripl3dogdare/MagiStack Official MagiStack interpreter on GitHub] [[Category: Languages]] [[Category: 2015]] [[Category: Implemented]] [[Category: Stack-based]]'