125 lines
4.7 KiB
JavaScript
125 lines
4.7 KiB
JavaScript
// sprintf() for JavaScript 0.7-beta1
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// http://www.diveintojavascript.com/projects/javascript-sprintf
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//
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// Copyright (c) Alexandru Marasteanu <alexaholic [at) gmail (dot] com>
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// All rights reserved.
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var strRepeat = require('./helper/strRepeat');
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var toString = Object.prototype.toString;
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var sprintf = (function() {
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function get_type(variable) {
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return toString.call(variable).slice(8, -1).toLowerCase();
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}
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var str_repeat = strRepeat;
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var str_format = function() {
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if (!str_format.cache.hasOwnProperty(arguments[0])) {
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str_format.cache[arguments[0]] = str_format.parse(arguments[0]);
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}
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return str_format.format.call(null, str_format.cache[arguments[0]], arguments);
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};
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str_format.format = function(parse_tree, argv) {
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var cursor = 1, tree_length = parse_tree.length, node_type = '', arg, output = [], i, k, match, pad, pad_character, pad_length;
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for (i = 0; i < tree_length; i++) {
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node_type = get_type(parse_tree[i]);
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if (node_type === 'string') {
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output.push(parse_tree[i]);
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}
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else if (node_type === 'array') {
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match = parse_tree[i]; // convenience purposes only
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if (match[2]) { // keyword argument
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arg = argv[cursor];
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for (k = 0; k < match[2].length; k++) {
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if (!arg.hasOwnProperty(match[2][k])) {
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throw new Error(sprintf('[_.sprintf] property "%s" does not exist', match[2][k]));
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}
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arg = arg[match[2][k]];
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}
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} else if (match[1]) { // positional argument (explicit)
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arg = argv[match[1]];
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}
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else { // positional argument (implicit)
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arg = argv[cursor++];
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}
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if (/[^s]/.test(match[8]) && (get_type(arg) != 'number')) {
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throw new Error(sprintf('[_.sprintf] expecting number but found %s', get_type(arg)));
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}
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switch (match[8]) {
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case 'b': arg = arg.toString(2); break;
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case 'c': arg = String.fromCharCode(arg); break;
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case 'd': arg = parseInt(arg, 10); break;
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case 'e': arg = match[7] ? arg.toExponential(match[7]) : arg.toExponential(); break;
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case 'f': arg = match[7] ? parseFloat(arg).toFixed(match[7]) : parseFloat(arg); break;
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case 'o': arg = arg.toString(8); break;
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case 's': arg = ((arg = String(arg)) && match[7] ? arg.substring(0, match[7]) : arg); break;
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case 'u': arg = Math.abs(arg); break;
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case 'x': arg = arg.toString(16); break;
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case 'X': arg = arg.toString(16).toUpperCase(); break;
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}
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arg = (/[def]/.test(match[8]) && match[3] && arg >= 0 ? '+'+ arg : arg);
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pad_character = match[4] ? match[4] == '0' ? '0' : match[4].charAt(1) : ' ';
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pad_length = match[6] - String(arg).length;
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pad = match[6] ? str_repeat(pad_character, pad_length) : '';
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output.push(match[5] ? arg + pad : pad + arg);
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}
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}
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return output.join('');
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};
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str_format.cache = {};
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str_format.parse = function(fmt) {
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var _fmt = fmt, match = [], parse_tree = [], arg_names = 0;
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while (_fmt) {
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if ((match = /^[^\x25]+/.exec(_fmt)) !== null) {
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parse_tree.push(match[0]);
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}
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else if ((match = /^\x25{2}/.exec(_fmt)) !== null) {
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parse_tree.push('%');
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}
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else if ((match = /^\x25(?:([1-9]\d*)\$|\(([^\)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(_fmt)) !== null) {
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if (match[2]) {
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arg_names |= 1;
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var field_list = [], replacement_field = match[2], field_match = [];
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if ((field_match = /^([a-z_][a-z_\d]*)/i.exec(replacement_field)) !== null) {
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field_list.push(field_match[1]);
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while ((replacement_field = replacement_field.substring(field_match[0].length)) !== '') {
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if ((field_match = /^\.([a-z_][a-z_\d]*)/i.exec(replacement_field)) !== null) {
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field_list.push(field_match[1]);
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}
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else if ((field_match = /^\[(\d+)\]/.exec(replacement_field)) !== null) {
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field_list.push(field_match[1]);
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}
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else {
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throw new Error('[_.sprintf] huh?');
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}
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}
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}
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else {
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throw new Error('[_.sprintf] huh?');
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}
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match[2] = field_list;
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}
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else {
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arg_names |= 2;
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}
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if (arg_names === 3) {
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throw new Error('[_.sprintf] mixing positional and named placeholders is not (yet) supported');
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}
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parse_tree.push(match);
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}
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else {
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throw new Error('[_.sprintf] huh?');
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}
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_fmt = _fmt.substring(match[0].length);
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}
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return parse_tree;
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};
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return str_format;
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})();
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module.exports = sprintf;
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