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| printf.js |
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var util = require('util');
var tokenize = function(/*String*/ str, /*RegExp*/ re, /*Function?*/ parseDelim, /*Object?*/ instance){
// summary:
// Split a string by a regular expression with the ability to capture the delimeters
// parseDelim:
// Each group (excluding the 0 group) is passed as a parameter. If the function returns
// a value, it's added to the list of tokens.
// instance:
// Used as the "this' instance when calling parseDelim
var tokens = [];
var match, content, lastIndex = 0;
while((match = re.exec(str))){
content = str.slice(lastIndex, re.lastIndex - match[0].length);
if(content.length){
tokens.push(content);
}
if(parseDelim){
var parsed = parseDelim.apply(instance, match.slice(1).concat(tokens.length));
if(typeof parsed != 'undefined'){
if(parsed.specifier === '%'){
tokens.push('%');
}else{
tokens.push(parsed);
}
}
}
lastIndex = re.lastIndex;
}
content = str.slice(lastIndex);
if(content.length){
tokens.push(content);
}
return tokens;
};
var Formatter = function(/*String*/ format){
this._mapped = false;
this._format = format;
this._tokens = tokenize(format, this._re, this._parseDelim, this);
};
Formatter.prototype._re = /\%(?:\(([\w_.]+)\)|([1-9]\d*)\$)?([0 +\-\#]*)(\*|\d+)?(\.)?(\*|\d+)?[hlL]?([\%bscdeEfFgGioOuxX])/g;
Formatter.prototype._parseDelim = function(mapping, intmapping, flags, minWidth, period, precision, specifier){
if(mapping){
this._mapped = true;
}
return {
mapping: mapping,
intmapping: intmapping,
flags: flags,
_minWidth: minWidth, // May be dependent on parameters
period: period,
_precision: precision, // May be dependent on parameters
specifier: specifier
};
};
Formatter.prototype._specifiers = {
b: {
base: 2,
isInt: true
},
o: {
base: 8,
isInt: true
},
x: {
base: 16,
isInt: true
},
X: {
extend: ['x'],
toUpper: true
},
d: {
base: 10,
isInt: true
},
i: {
extend: ['d']
},
u: {
extend: ['d'],
isUnsigned: true
},
c: {
setArg: function(token){
if(!isNaN(token.arg)){
var num = parseInt(token.arg);
if(num < 0 || num > 127){
throw new Error('invalid character code passed to %c in printf');
}
token.arg = isNaN(num) ? '' + num : String.fromCharCode(num);
}
}
},
s: {
setMaxWidth: function(token){
token.maxWidth = (token.period == '.') ? token.precision : -1;
}
},
e: {
isDouble: true,
doubleNotation: 'e'
},
E: {
extend: ['e'],
toUpper: true
},
f: {
isDouble: true,
doubleNotation: 'f'
},
F: {
extend: ['f']
},
g: {
isDouble: true,
doubleNotation: 'g'
},
G: {
extend: ['g'],
toUpper: true
},
O: {
isObject: true
}
};
Formatter.prototype.format = function(/*mixed...*/ filler){
if(this._mapped && typeof filler != 'object'){
throw new Error('format requires a mapping');
}
var str = '';
var position = 0;
for(var i = 0, token; i < this._tokens.length; i++){
token = this._tokens[i];
if(typeof token == 'string'){
str += token;
}else{
if(this._mapped){
// Identify value of property defined in `token.mapping`
var tokens = token.mapping.split('.');
var value = filler;
for (var j = 0, c = tokens.length; j < c; j++) {
value = value[tokens[j]];
if (typeof value === 'undefined') {
break
}
}
if(typeof value == 'undefined'){
throw new Error('missing key ' + token.mapping);
}
token.arg = value;
}else{
if(token.intmapping){
position = parseInt(token.intmapping) - 1;
}
if(position >= arguments.length){
throw new Error('got ' + arguments.length + ' printf arguments, insufficient for \'' + this._format + '\'');
}
token.arg = arguments[position++];
}
if(!token.compiled){
token.compiled = true;
token.sign = '';
token.zeroPad = false;
token.rightJustify = false;
token.alternative = false;
var flags = {};
for(var fi = token.flags.length; fi--;){
var flag = token.flags.charAt(fi);
flags[flag] = true;
switch(flag){
case ' ':
token.sign = ' ';
break;
case '+':
token.sign = '+';
break;
case '0':
token.zeroPad = (flags['-']) ? false : true;
break;
case '-':
token.rightJustify = true;
token.zeroPad = false;
break;
case '#':
token.alternative = true;
break;
default:
throw Error('bad formatting flag \'' + token.flags.charAt(fi) + '\'');
}
}
token.minWidth = (token._minWidth) ? parseInt(token._minWidth) : 0;
token.maxWidth = -1;
token.toUpper = false;
token.isUnsigned = false;
token.isInt = false;
token.isDouble = false;
token.isObject = false;
token.precision = 1;
if(token.period == '.'){
if(token._precision){
token.precision = parseInt(token._precision);
}else{
token.precision = 0;
}
}
var mixins = this._specifiers[token.specifier];
if(typeof mixins == 'undefined'){
throw new Error('unexpected specifier \'' + token.specifier + '\'');
}
if(mixins.extend){
var s = this._specifiers[mixins.extend];
for(var k in s){
mixins[k] = s[k];
}
delete mixins.extend;
}
for(var l in mixins){
token[l] = mixins[l];
}
}
if(typeof token.setArg == 'function'){
token.setArg(token);
}
if(typeof token.setMaxWidth == 'function'){
token.setMaxWidth(token);
}
if(token._minWidth == '*'){
if(this._mapped){
throw new Error('* width not supported in mapped formats');
}
token.minWidth = parseInt(arguments[position++]);
if(isNaN(token.minWidth)){
throw new Error('the argument for * width at position ' + position + ' is not a number in ' + this._format);
}
// negative width means rightJustify
if (token.minWidth < 0) {
token.rightJustify = true;
token.minWidth = -token.minWidth;
}
}
if(token._precision == '*' && token.period == '.'){
if(this._mapped){
throw new Error('* precision not supported in mapped formats');
}
token.precision = parseInt(arguments[position++]);
if(isNaN(token.precision)){
throw Error('the argument for * precision at position ' + position + ' is not a number in ' + this._format);
}
// negative precision means unspecified
if (token.precision < 0) {
token.precision = 1;
token.period = '';
}
}
if(token.isInt){
// a specified precision means no zero padding
if(token.period == '.'){
token.zeroPad = false;
}
this.formatInt(token);
}else if(token.isDouble){
if(token.period != '.'){
token.precision = 6;
}
this.formatDouble(token);
}else if(token.isObject){
this.formatObject(token);
}
this.fitField(token);
str += '' + token.arg;
}
}
return str;
};
Formatter.prototype._zeros10 = '0000000000';
Formatter.prototype._spaces10 = ' ';
Formatter.prototype.formatInt = function(token) {
var i = parseInt(token.arg);
if(!isFinite(i)){ // isNaN(f) || f == Number.POSITIVE_INFINITY || f == Number.NEGATIVE_INFINITY)
// allow this only if arg is number
if(typeof token.arg != 'number'){
throw new Error('format argument \'' + token.arg + '\' not an integer; parseInt returned ' + i);
}
//return '' + i;
i = 0;
}
// if not base 10, make negatives be positive
// otherwise, (-10).toString(16) is '-a' instead of 'fffffff6'
if(i < 0 && (token.isUnsigned || token.base != 10)){
i = 0xffffffff + i + 1;
}
if(i < 0){
token.arg = (- i).toString(token.base);
this.zeroPad(token);
token.arg = '-' + token.arg;
}else{
token.arg = i.toString(token.base);
// need to make sure that argument 0 with precision==0 is formatted as ''
if(!i && !token.precision){
token.arg = '';
}else{
this.zeroPad(token);
}
if(token.sign){
token.arg = token.sign + token.arg;
}
}
if(token.base == 16){
if(token.alternative){
token.arg = '0x' + token.arg;
}
token.arg = token.toUpper ? token.arg.toUpperCase() : token.arg.toLowerCase();
}
if(token.base == 8){
if(token.alternative && token.arg.charAt(0) != '0'){
token.arg = '0' + token.arg;
}
}
};
Formatter.prototype.formatDouble = function(token) {
var f = parseFloat(token.arg);
if(!isFinite(f)){ // isNaN(f) || f == Number.POSITIVE_INFINITY || f == Number.NEGATIVE_INFINITY)
// allow this only if arg is number
if(typeof token.arg != 'number'){
throw new Error('format argument \'' + token.arg + '\' not a float; parseFloat returned ' + f);
}
// C99 says that for 'f':
// infinity -> '[-]inf' or '[-]infinity' ('[-]INF' or '[-]INFINITY' for 'F')
// NaN -> a string starting with 'nan' ('NAN' for 'F')
// this is not commonly implemented though.
//return '' + f;
f = 0;
}
switch(token.doubleNotation) {
case 'e': {
token.arg = f.toExponential(token.precision);
break;
}
case 'f': {
token.arg = f.toFixed(token.precision);
break;
}
case 'g': {
// C says use 'e' notation if exponent is < -4 or is >= prec
// ECMAScript for toPrecision says use exponential notation if exponent is >= prec,
// though step 17 of toPrecision indicates a test for < -6 to force exponential.
if(Math.abs(f) < 0.0001){
//print('forcing exponential notation for f=' + f);
token.arg = f.toExponential(token.precision > 0 ? token.precision - 1 : token.precision);
}else{
token.arg = f.toPrecision(token.precision);
}
// In C, unlike 'f', 'gG' removes trailing 0s from fractional part, unless alternative format flag ('#').
// But ECMAScript formats toPrecision as 0.00100000. So remove trailing 0s.
if(!token.alternative){
//print('replacing trailing 0 in \'' + s + '\'');
token.arg = token.arg.replace(/(\..*[^0])0*e/, '$1e');
// if fractional part is entirely 0, remove it and decimal point
token.arg = token.arg.replace(/\.0*e/, 'e').replace(/\.0$/,'');
}
break;
}
default: throw new Error('unexpected double notation \'' + token.doubleNotation + '\'');
}
// C says that exponent must have at least two digits.
// But ECMAScript does not; toExponential results in things like '1.000000e-8' and '1.000000e+8'.
// Note that s.replace(/e([\+\-])(\d)/, 'e$10$2') won't work because of the '$10' instead of '$1'.
// And replace(re, func) isn't supported on IE50 or Safari1.
token.arg = token.arg.replace(/e\+(\d)$/, 'e+0$1').replace(/e\-(\d)$/, 'e-0$1');
// if alt, ensure a decimal point
if(token.alternative){
token.arg = token.arg.replace(/^(\d+)$/,'$1.');
token.arg = token.arg.replace(/^(\d+)e/,'$1.e');
}
if(f >= 0 && token.sign){
token.arg = token.sign + token.arg;
}
token.arg = token.toUpper ? token.arg.toUpperCase() : token.arg.toLowerCase();
};
Formatter.prototype.formatObject = function(token) {
// If no precision is specified, then reset it to null (infinite depth).
var precision = (token.period === '.') ? token.precision : null;
token.arg = util.inspect(token.arg, !token.alternative, precision);
};
Formatter.prototype.zeroPad = function(token, /*Int*/ length) {
length = (arguments.length == 2) ? length : token.precision;
var negative = false;
if(typeof token.arg != "string"){
token.arg = "" + token.arg;
}
if (token.arg.substr(0,1) === '-') {
negative = true;
token.arg = token.arg.substr(1);
}
var tenless = length - 10;
while(token.arg.length < tenless){
token.arg = (token.rightJustify) ? token.arg + this._zeros10 : this._zeros10 + token.arg;
}
var pad = length - token.arg.length;
token.arg = (token.rightJustify) ? token.arg + this._zeros10.substring(0, pad) : this._zeros10.substring(0, pad) + token.arg;
if (negative) token.arg = '-' + token.arg;
};
Formatter.prototype.fitField = function(token) {
if(token.maxWidth >= 0 && token.arg.length > token.maxWidth){
return token.arg.substring(0, token.maxWidth);
}
if(token.zeroPad){
this.zeroPad(token, token.minWidth);
return;
}
this.spacePad(token);
};
Formatter.prototype.spacePad = function(token, /*Int*/ length) {
length = (arguments.length == 2) ? length : token.minWidth;
if(typeof token.arg != 'string'){
token.arg = '' + token.arg;
}
var tenless = length - 10;
while(token.arg.length < tenless){
token.arg = (token.rightJustify) ? token.arg + this._spaces10 : this._spaces10 + token.arg;
}
var pad = length - token.arg.length;
token.arg = (token.rightJustify) ? token.arg + this._spaces10.substring(0, pad) : this._spaces10.substring(0, pad) + token.arg;
};
module.exports = function(){
var args = Array.prototype.slice.call(arguments),
stream, format;
if(args[0] instanceof require('stream').Stream){
stream = args.shift();
}
format = args.shift();
var formatter = new Formatter(format);
var string = formatter.format.apply(formatter, args);
if(stream){
stream.write(string);
}else{
return string;
}
};
module.exports.Formatter = Formatter;
| .. | |||||
| printf.js |