Created
October 28, 2011 23:14
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眠れないのでbrainf*ck処理系を1時間くらいで作った
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>brainf*ck</title> | |
| <script> | |
| var ptr = 0; | |
| var memory = []; | |
| var code = ""; | |
| var ptrIncr = />/; | |
| var ptrDecr = /</; | |
| var varIncr = /\+/; | |
| var varDecr = /-/; | |
| var output = /\./; | |
| var input = /,/; | |
| var jmpIn = /\[/; | |
| var jmpOut = /\]/; | |
| var index = 0; | |
| var clear = function(){ | |
| memory = []; | |
| ptr = 0; | |
| index = 0; | |
| } | |
| var step = function(){ | |
| if(!code || index >= code.length){return ;} | |
| var op = code[index]; | |
| try{ | |
| if(op.match(ptrIncr)){ | |
| ptr++; | |
| }else if(op.match(ptrDecr)){ | |
| ptr--; | |
| if(ptr < 0) throw "ポインタが負の値を取りました"; | |
| }else if(op.match(varIncr)){ | |
| if(!memory[ptr]) memory[ptr] = 0 ; | |
| memory[ptr]++; | |
| memory[ptr] &= 0xff; | |
| }else if(op.match(varDecr)){ | |
| if(!memory[ptr]) memory[ptr] = 0 ; | |
| memory[ptr]--; | |
| memory[ptr] &= 0xff; | |
| }else if(op.match(output)){ | |
| if(!memory[ptr]) memory[ptr] = 0 ; | |
| document.getElementById('outputArea').value += String.fromCharCode(memory[ptr]); | |
| }else if(op.match(input)){ | |
| var value = window.prompt('input'); | |
| memory[ptr] = value ? value.charCodeAt(0):0; | |
| }else if(op.match(jmpIn)){ | |
| if(!memory[ptr]) memory[ptr] = 0 ; | |
| if(memory[ptr] == 0){ | |
| var count = 0; | |
| while(index < code.length){ | |
| index++ ; | |
| if(code[index].match(jmpIn)){ | |
| count++; | |
| }else if(code[index].match(jmpOut)){ | |
| if( count > 0){ | |
| count--; | |
| }else{ | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| }else if(op.match(jmpOut)){ | |
| if(!memory[ptr]) memory[ptr] = 0 ; | |
| if(memory[ptr] != 0){ | |
| var count = 0; | |
| while(index >= 0){ | |
| index--; | |
| if(code[index].match(jmpOut)){ | |
| count++; | |
| }else if(code[index].match(jmpIn)){ | |
| if( count > 0){ | |
| count--; | |
| }else{ | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| } | |
| index++; | |
| step(); | |
| }catch(e){ | |
| window.alert(e) | |
| } | |
| }; | |
| window.addEventListener('load',function(){ | |
| document.getElementById('codeForm').addEventListener('submit',function(e){ | |
| e.preventDefault(); | |
| clear(); | |
| code = document.getElementById('codeArea').value; | |
| step(); | |
| return false; | |
| }); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <h2>コード</h2> | |
| <form id="codeForm"> | |
| <textarea id="codeArea" name="codeArea"></textarea> | |
| <input type="submit" value="実行" /> | |
| </form> | |
| <form id="interactionForm"> | |
| <h2>実行結果</h2> | |
| <textarea id="outputArea" name="outputArea" id="outputArea"></textarea> | |
| </form> | |
| </body> | |
| </html> | |
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