apple2js/js/ui/printer.js
Will Scullin bcbe36db0c
Refactor main (#17)
* Refactor UI elements.

* Cleanup.

* Refactor core.

* Fix printer.

* Small fixes

* Fix frame counts
2019-12-27 15:04:07 -08:00

58 lines
1.7 KiB
JavaScript

/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation. No representations are made about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*/
export default function Printer(el) {
var paper = document.querySelector(el);
var _lineBuffer = '';
var _line;
function newLine() {
_line = document.createElement('div');
_line.classList.add('line');
_line.innerText = _lineBuffer;
paper.append(_line);
_lineBuffer = '';
}
newLine();
return {
putChar: function(val) {
var ascii = val & 0x7f;
var visible = val >= 0x20;
var c = String.fromCharCode(ascii);
if (c === '\r') {
newLine();
} else if (c === '\n') {
// eat for now
} else if (c === '\t') {
_lineBuffer += ' ';
} else if (ascii === 0x04) {
_lineBuffer = _lineBuffer.slice(0, -1);
} else if (visible) {
_lineBuffer += c;
}
_line.innerText = _lineBuffer;
},
clear: function() {
_lineBuffer = '';
paper.empty();
newLine();
},
hasPrintout: function() {
return paper.text.length;
}
};
}