Write an interpreter for 2B
I like David Catt's esoteric language 2B, having memory stored in a tape where each cell is a seperate tape of bytes (the 'subtape'). Write an interpreter for it!
Language Specification
Official specification can be found here. In this specification, " means a number in the range 0-9 (0 is interpreted as 10), and _ means a string of any length. Each cell stores a value in the range 0-255, and overflow/underflow wraps around as it would a BF. (Thanks @MartinBüttner). To convert text to numbers 0-255, use ASCII codes. Because I can find no detail on this, I'm going to say that the tape length should be 255 minimum, but if you know otherwise please edit.
+-------------+----------------------------------------------------------------------------------------------------------------------------------------+
| Instruction | Description |
+-------------+----------------------------------------------------------------------------------------------------------------------------------------+
| 0 | Zeroes the current cell and clears the overflow/underflow flag. |
| { | If the current cell is zero, jump to the matching }. |
| } | A placeholder for the { instruction. |
| ( | Read a byte from the input stream and place it in the current cell. |
| ) | Write the value of the current cell to the console. |
| x | Store the value of the current cell in a temporary register. |
| o | Write the value of the temporary register to the console. |
| ! | If the last addition overflowed, add one to the current cell. If the last subtraction underflowed, subtract one from the current cell. |
| ? | Performs a binary NOT on the current cell. |
| +" | Adds an amount to the current cell. |
| -" | Subtracts an amount from the current cell. |
| ^" | Moves the subtape up a number of times. |
| V" | Moves the subtape down a number of times. |
| <" | Moves the tape left a number of times. |
| >" | Moves the tape right a number of times. |
| :_: | Defines a label of name _. |
| *_* | Jumps to a label of name _. |
| ~_~ | Defines a function of name _. |
| @_@ | Calls a function of name _. |
| % | Ends a function definition. |
| #_# | Is a comment. |
| [SPACE] | Is an NOP. |
| [NEWLINE] | Is treated as whitespace and removed. |
| [TAB] | Is treated as whitespace and removed. |
+-------------+----------------------------------------------------------------------------------------------------------------------------------------+
Tests
+0+0+0+0+0+0+0+2)+0+0+9)+7))+3)-0-0-0-0-0-0-0-9)+0+0+0+0+0+0+0+0+7)-8)+3)-6)-8)-7-0-0-0-0-0-0)
Should output Hello world!
+1:i:{()*i*}
Sort of a cat program, just without a newline.
+1:loop:{@ReadChar@*loop*}@PrintHello@@WriteAll@(~ReadChar~(x-0-3<2o^1>1+1>1%~PrintHello~+0+0+0+0+0+0+0+2)-1+0+0+0)+7))+3)+1-0-0-0-0-0-0-0-0)%~WriteAll~<1x:reverse:{<1v1>1-1*reverse*}o-1:print:{-1<1)^1>1*print*}%
Should first accept a name, then, on press of Return, should output Hello name (where name is what was inputted).
Credit for that program goes to David Catt.
I'm working on a full test program.
Rules
- Standard loopholes are forbidden
- Your interpreter must meet all the specifications, except for comments, which are not required.
Scoring
- This is code-golf, so fewest bytes wins!
- -10 bytes if your interpreter handles comments.
Leaderboard
Here is a Stack Snippet to generate both a regular leaderboard and an overview of winners by language.
To make sure that your answer shows up, please start your answer with a headline, using the following Markdown template:
# Language Name, N bytes
where N is the size of your submission. If you improve your score, you can keep old scores in the headline, by striking them through. For instance:
# Ruby, <s>104</s> <s>101</s> 96 bytes
var QUESTION_ID=67123;function answersUrl(e){return"http://api.stackexchange.com/2.2/questions/"+QUESTION_ID+"/answers?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+ANSWER_FILTER}function getAnswers(){jQuery.ajax({url:answersUrl(page++),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){answers.push.apply(answers,e.items),e.has_more?getAnswers():process()}})}function shouldHaveHeading(e){var a=!1,r=e.body_markdown.split("\n");try{a|=/^#/.test(e.body_markdown),a|=["-","="].indexOf(r[1][0])>-1,a&=LANGUAGE_REG.test(e.body_markdown)}catch(n){}return a}function shouldHaveScore(e){var a=!1;try{a|=SIZE_REG.test(e.body_markdown.split("\n")[0])}catch(r){}return a}function getAuthorName(e){return e.owner.display_name}function process(){answers=answers.filter(shouldHaveScore).filter(shouldHaveHeading),answers.sort(function(e,a){var r=+(e.body_markdown.split("\n")[0].match(SIZE_REG)||[1/0])[0],n=+(a.body_markdown.split("\n")[0].match(SIZE_REG)||[1/0])[0];return r-n});var e={},a=1,r=null,n=1;answers.forEach(function(s){var t=s.body_markdown.split("\n")[0],o=jQuery("#answer-template").html(),l=(t.match(NUMBER_REG)[0],(t.match(SIZE_REG)||[0])[0]),c=t.match(LANGUAGE_REG)[1],i=getAuthorName(s);l!=r&&(n=a),r=l,++a,o=o.replace("{{PLACE}}",n+".").replace("{{NAME}}",i).replace("{{LANGUAGE}}",c).replace("{{SIZE}}",l).replace("{{LINK}}",s.share_link),o=jQuery(o),jQuery("#answers").append(o),e[c]=e[c]||{lang:c,user:i,size:l,link:s.share_link}});var s=[];for(var t in e)e.hasOwnProperty(t)&&s.push(e[t]);s.sort(function(e,a){return e.lang>a.lang?1:e.lang<a.lang?-1:0});for(var o=0;o<s.length;++o){var l=jQuery("#language-template").html(),t=s[o];l=l.replace("{{LANGUAGE}}",t.lang).replace("{{NAME}}",t.user).replace("{{SIZE}}",t.size).replace("{{LINK}}",t.link),l=jQuery(l),jQuery("#languages").append(l)}}var ANSWER_FILTER="!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe",answers=[],page=1;getAnswers();var SIZE_REG=/\d+(?=[^\d&]*(?:<(?:s>[^&]*<\/s>|[^&]+>)[^\d&]*)*$)/,NUMBER_REG=/\d+/,LANGUAGE_REG=/^#*\s*([^,]+)/;body{text-align:left!important}#answer-list,#language-list{padding:10px;width:290px;float:left}table thead{font-weight:700}table td{padding:5px}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b"><div id="answer-list"> <h2>Leaderboard</h2> <table class="answer-list"> <thead> <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr></thead> <tbody id="answers"> </tbody> </table></div><div id="language-list"> <h2>Winners by Language</h2> <table class="language-list"> <thead> <tr><td>Language</td><td>User</td><td>Score</td></tr></thead> <tbody id="languages"> </tbody> </table></div><table style="display: none"> <tbody id="answer-template"> <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody></table><table style="display: none"> <tbody id="language-template"> <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody></table>
