brainfuck.html | searchcode

/brainfuck.html

https://repo.or.cz/zzandy.git
HTML | 211 lines | 170 code | 41 blank | 0 comment | 0 complexity | 923389b4d299c7ac4f782d43f9e2bee2 MD5 | raw file

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta content="text/html; charset=utf-8" http-equiv="Content-Type"/>
    <link rel="stylesheet" href="style/pixelless.css" type="text/css"/>
    <script type="text/javascript" src="script/util.js"></script>
    <title>Brainfuck</title>
</head>
<body>
<div id="container">
    <div class="content header">
        <h1>Brainfuck</h1>
    </div>

    <div class="content">
        <p><a href="http://en.wikipedia.org/wiki/Brainfuck">Brainfuck</a> "IDE"</p>
        <a href="#" onclick="run(); return false;" id="runit" style="text-decoration: none">&#x25B6; Run</a><br/>

        <pre>Clear: <a href="javascript:add(this)" onclick="add(this); return false;">[-]</a>                          Clear prev no zero: <a
                href="javascript:add(this)" onclick="add(this); return false;">[[-]&lt;]</a>
Rewind: <a href="javascript:add(this)" onclick="add(this); return false;">[&lt;]&gt;</a>                        Fast-forward: <a
                    href="javascript:add(this)" onclick="add(this); return false;">[&gt;]&lt;</a>
Cat: <a href="javascript:add(this)" onclick="add(this); return false;">,[.,]</a>                          Moving the pointer: <a
                    href="javascript:add(this)" onclick="add(this); return false;">&gt;,[.&gt;,]</a>
Add: <a href="javascript:add(this)" onclick="add(this); return false;">[-&gt;+&lt;]</a> or <a
                    href="javascript:add(this)" onclick="add(this); return false;">[-&gt;+&gt;+&lt;&lt;]&gt;&gt;[-&lt;&lt;+&gt;&gt;]</a>  Copy: <a
                    href="javascript:add(this)" onclick="add(this); return false;">[-]&gt;[-]&lt;&lt;[-&gt;+&gt;+&lt;&lt;]&gt;&gt;[-&lt;&lt;+&gt;&gt;]</a></pre>


        <div id="memory" style="float:right"></div>
        <div id="hint" style="clear: right; float:right">
            &gt; move right<br/>
            &lt; move left<br/>
            + increment data<br/>
            - decrement data<br/>
            . output<br/>
            , input<br/>
            [ if data is zero jump after matching ]<br/>
            ] id data is not zero goto matching [<br/>
        </div>
        <label>Input: <input type="text" id="input" value="" style="margin-bottom: .2em; font-family:monospace; width:80ex"/></label><br/>
        <textarea id="edit" cols="80" rows="14"></textarea>
        <textarea id="out" cols="80" rows="6" readonly="readonly"></textarea>
    </div>
</div>
<div id="footer">
    <div class="content">
        &copy; Copyright
    </div>
</div>
<script type="text/javascript" language="JavaScript">
    var memoryLimit = 30000;
    var execLimit = 10000;

    function add(obj)
    {
        var target = document.getElementById('edit');
        var x = target.selectionStart;
        var value = obj.innerHTML.replace(/&lt;/g, "<").replace(/&gt;/g, ">");
        var before = target.value.substring(0, x);
        var after = target.value.substr(target.selectionEnd);
        target.value = before + value + after;
        target.selectionStart = x + value.length;
        target.selectionEnd = x + value.length;
        target.focus();
    }

    function run()
    {
        function add(n)
        {
            var x = (memory[addr] || 0) + n;
            if (x > 255)x = 0;
            if (x < 0)x = 255;
            memory[addr] = x;
            return x;
        }

        function get_input()
        {
            var r = input[inpos++];
            if (r === undefined) return 0; // EOF
            return r.charCodeAt(0);
        }

        var inpos = 0;
        var input = document.getElementById('input').value;
        var src = document.getElementById('edit').value;

        var addr = 0;
        var memory = [];
        var out = '';

        var line = 1;
        var column = 0;

        var loops = [];
        var steps = 0;
        var loopstack = [];

        var i = -1, n = src.length;
        while (++i < n)
        {
            ++column;
            var op = src[i];
            switch (op) {
                case '[':
                    loops[i] = 0;
                    loopstack.push(i);

                    break;

                case ']':
                    var loop = loopstack.pop();

                    if (loop === undefined)
                        throw new Error(['Loop brace mismatch at line', line, ', column', column].join(' '));
                    loops[loop] = i;

                    break;

                case '\n':
                    ++line;
                    column = 1;

                    break;
            }
        }

        delete loopstack;

        line = 1;
        column = 0;
        i = -1;
        n = src.length;
        while (++i < n)
        {
            if (++steps > execLimit)
                throw new Error(['Execution limit of ', execLimit, ' cycles exceded at line ', line, ', column', column].join(' '));

            ++column;
            var op = src[i];
            switch (op) {
                case '\n':
                    ++line;
                    column = 0;

                    break;

                case '<':
                    if (--addr < 0)
                        throw new Error(['Address underrun at line', line, ', column', column].join(' '));

                    break;

                case '>':
                    if (++addr > memoryLimit)
                        throw new Error(['Address overrun at line', line, ', column', column].join(' '));

                    break;

                case '-':
                    add(-1);

                    break;

                case '+':
                    add(1);

                    break;

                case '[':
                    if (!memory[addr])
                        i = loops[i];

                    break;

                case ']':
                    i = loops.indexOf(i);
                    if (i == -1)
                        throw new Error(['Unxepected loop error at line', line, ', column', column].join(' '));

                    --i;
                    break;

                case '.':
                    if (memory[addr] < 32)
                        out += memory[addr].toString() + ' ';
                    else
                        out += String.fromCharCode(memory[addr]);

                    break;

                case ',':
                    memory[addr] = get_input();

                    break;
            }
        }

        document.getElementById('memory').innerHTML = memory.map(function(x, n) {
            if (n == addr)return '<u>' + x + '</u>'; else return x;
        });
        document.getElementById('out').value = out;
    }


</script>
</body>
</html>