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buffer.js
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buffer.js
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import { textWasPrinted } from "./input";
import { font } from "./style";
import {
append as appendToWindow,
get as getWindow
} from "./window";
// output buffers for all windows
const outputBuffer = [ "" ];
// custom output filters
let outputFilter = null;
/**
* Make text HTML-printable
*
* @param text
* @returns {string}
*/
function encodeHtml( text ) {
let encoded = "";
for( let i = 0; i < text.length; ++i ) {
// Extended Latin-1 characters need to be added as HTML entities
if( text.charCodeAt( i ) > 127 ) {
encoded += "&#" + text.charCodeAt( i ) + ";";
}
else {
switch( text[ i ] ) {
case "&":
encoded += "&";
break;
case "<":
encoded += "<";
break;
case ">":
encoded += ">";
break;
case "\r":
encoded += "\n";
break;
default:
encoded += text[ i ];
break;
}
}
}
return encoded;
}
/**
* Add text to the text buffer
*
* @param text
* @param targetWindow
*/
export function append( text, targetWindow = 0 ) {
if( !outputBuffer[ targetWindow ] ) {
outputBuffer[ targetWindow ] = "";
}
if( text.indexOf( "\n" ) > -1 || text.indexOf( "\r" ) > -1 ) {
const nextLBR = Math.max( text.lastIndexOf( "\n" ), text.lastIndexOf( "\r" ) ) + 1;
outputBuffer[ targetWindow ] += encodeHtml( text.substr( 0, nextLBR ) );
flush( targetWindow );
outputBuffer[ targetWindow ] = encodeHtml( text.substr( nextLBR ) );
}
else {
outputBuffer[ targetWindow ] += encodeHtml( text );
}
}
/**
* Print out the text buffer
*
* @param targetWindow
*/
export function flush( targetWindow ) {
if( targetWindow === undefined ) {
for( var i in outputBuffer ) {
flush( +i );
}
return;
}
if( !outputBuffer[ targetWindow ] || !getWindow( targetWindow ) ) {
return;
}
let output = outputBuffer[ targetWindow ];
// call output filters
if( targetWindow === 0 && outputFilter && output !== "" ) {
const currentStyles = font.get()[ 0 ];
const filterResult = outputFilter(
output,
{
style: {
bold: Boolean( currentStyles.bold ),
italic: Boolean( currentStyles.italic )
}
}
);
if( typeof filterResult === "string" ) {
output = filterResult;
}
}
appendToWindow( output, targetWindow );
outputBuffer[ targetWindow ] = "";
if( targetWindow === 0 ) {
textWasPrinted( true );
}
}
/**
* Register the output filter
*/
export function init( opt ) {
if( opt && opt.outputFilter ) {
outputFilter = opt.outputFilter;
}
}
/**
* Add a newline to the buffer.
*
* @param targetWindow
*/
export function newline( targetWindow ) {
if( outputBuffer[ targetWindow ] ) {
outputBuffer[ targetWindow ] += "\n";
}
else {
outputBuffer[ targetWindow ] = "\n";
}
flush( targetWindow );
}