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schwaral
133
stud/overlib/sprintf.js
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133
stud/overlib/sprintf.js
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/* Function printf(format_string,arguments...)
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* Javascript emulation of the C printf function (modifiers and argument types
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* "p" and "n" are not supported due to language restrictions)
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*
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* Copyright 2003 K&L Productions. All rights reserved
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* http://www.klproductions.com
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*
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* Terms of use: This function can be used free of charge IF this header is not
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* modified and remains with the function code.
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*
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* Legal: Use this code at your own risk. K&L Productions assumes NO resposibility
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* for anything.
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********************************************************************************/
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function sprintf(fstring)
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{ var pad = function(str,ch,len)
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{ var ps='';
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for(var i=0; i<Math.abs(len); i++) ps+=ch;
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return len>0?str+ps:ps+str;
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}
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var processFlags = function(flags,width,rs,arg)
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{ var pn = function(flags,arg,rs)
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{ if(arg>=0)
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{ if(flags.indexOf(' ')>=0) rs = ' ' + rs;
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else if(flags.indexOf('+')>=0) rs = '+' + rs;
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}
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else
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rs = '-' + rs;
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return rs;
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}
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var iWidth = parseInt(width,10);
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if(width.charAt(0) == '0')
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{ var ec=0;
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if(flags.indexOf(' ')>=0 || flags.indexOf('+')>=0) ec++;
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if(rs.length<(iWidth-ec)) rs = pad(rs,'0',rs.length-(iWidth-ec));
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return pn(flags,arg,rs);
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}
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rs = pn(flags,arg,rs);
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if(rs.length<iWidth)
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{ if(flags.indexOf('-')<0) rs = pad(rs,' ',rs.length-iWidth);
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else rs = pad(rs,' ',iWidth - rs.length);
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}
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return rs;
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}
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var converters = new Array();
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converters['c'] = function(flags,width,precision,arg)
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{ if(typeof(arg) == 'number') return String.fromCharCode(arg);
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if(typeof(arg) == 'string') return arg.charAt(0);
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return '';
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}
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converters['d'] = function(flags,width,precision,arg)
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{ return converters['i'](flags,width,precision,arg);
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}
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converters['u'] = function(flags,width,precision,arg)
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{ return converters['i'](flags,width,precision,Math.abs(arg));
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}
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converters['i'] = function(flags,width,precision,arg)
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{ var iPrecision=parseInt(precision);
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var rs = ((Math.abs(arg)).toString().split('.'))[0];
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if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
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return processFlags(flags,width,rs,arg);
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}
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converters['E'] = function(flags,width,precision,arg)
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{ return (converters['e'](flags,width,precision,arg)).toUpperCase();
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}
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converters['e'] = function(flags,width,precision,arg)
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{ iPrecision = parseInt(precision);
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if(isNaN(iPrecision)) iPrecision = 6;
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rs = (Math.abs(arg)).toExponential(iPrecision);
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if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs.replace(/^(.*)(e.*)$/,'$1.$2');
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return processFlags(flags,width,rs,arg);
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}
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converters['f'] = function(flags,width,precision,arg)
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{ iPrecision = parseInt(precision);
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if(isNaN(iPrecision)) iPrecision = 6;
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rs = (Math.abs(arg)).toFixed(iPrecision);
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if(rs.indexOf('.')<0 && flags.indexOf('#')>=0) rs = rs + '.';
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return processFlags(flags,width,rs,arg);
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}
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converters['G'] = function(flags,width,precision,arg)
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{ return (converters['g'](flags,width,precision,arg)).toUpperCase();
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}
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converters['g'] = function(flags,width,precision,arg)
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{ iPrecision = parseInt(precision);
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absArg = Math.abs(arg);
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rse = absArg.toExponential();
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rsf = absArg.toFixed(6);
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if(!isNaN(iPrecision))
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{ rsep = absArg.toExponential(iPrecision);
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rse = rsep.length < rse.length ? rsep : rse;
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rsfp = absArg.toFixed(iPrecision);
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rsf = rsfp.length < rsf.length ? rsfp : rsf;
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}
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if(rse.indexOf('.')<0 && flags.indexOf('#')>=0) rse = rse.replace(/^(.*)(e.*)$/,'$1.$2');
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if(rsf.indexOf('.')<0 && flags.indexOf('#')>=0) rsf = rsf + '.';
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rs = rse.length<rsf.length ? rse : rsf;
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return processFlags(flags,width,rs,arg);
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}
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converters['o'] = function(flags,width,precision,arg)
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{ var iPrecision=parseInt(precision);
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var rs = Math.round(Math.abs(arg)).toString(8);
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if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
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if(flags.indexOf('#')>=0) rs='0'+rs;
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return processFlags(flags,width,rs,arg);
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}
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converters['X'] = function(flags,width,precision,arg)
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{ return (converters['x'](flags,width,precision,arg)).toUpperCase();
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}
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converters['x'] = function(flags,width,precision,arg)
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{ var iPrecision=parseInt(precision);
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arg = Math.abs(arg);
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var rs = Math.round(arg).toString(16);
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if(rs.length<iPrecision) rs=pad(rs,' ',iPrecision - rs.length);
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if(flags.indexOf('#')>=0) rs='0x'+rs;
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return processFlags(flags,width,rs,arg);
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}
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converters['s'] = function(flags,width,precision,arg)
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{ var iPrecision=parseInt(precision);
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var rs = arg;
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if(rs.length > iPrecision) rs = rs.substring(0,iPrecision);
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return processFlags(flags,width,rs,0);
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}
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farr = fstring.split('%');
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retstr = farr[0];
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fpRE = /^([-+ #]*)(\d*)\.?(\d*)([cdieEfFgGosuxX])(.*)$/;
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for(var i=1; i<farr.length; i++)
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{ fps=fpRE.exec(farr[i]);
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if(!fps) continue;
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if(arguments[i]!=null) retstr+=converters[fps[4]](fps[1],fps[2],fps[3],arguments[i]);
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retstr += fps[5];
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}
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return retstr;
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}
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/* Function sprintf() END */
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