Lao Tzu
131 lines
3.6 KiB
JavaScript
131 lines
3.6 KiB
JavaScript
/*
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Copyright (C) 2017-2019 Dimitar Toshkov Zhekov <dimitar.zhekov@gmail.com>
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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'use strict';
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// -- Various --
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const UNICODE_MAX = 1114111; // 0x10FFFF
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const UNICODE_BMP_MAX = 65535; // 0xFFFF
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function parseDec(name, s, minValue = 0, maxValue = UNICODE_MAX) {
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if (s.match(/^\s*-?\d+\s*$/) == null) {
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throw new Error(`invalid ${name} format`);
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}
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const value = parseInt(s, 10);
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if (minValue != null && value < minValue) {
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throw new Error(`${name} must be >= ${minValue}`);
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}
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if (maxValue != null && value > maxValue) {
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throw new Error(`${name} must be <= ${maxValue}`);
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}
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return value;
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}
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function parseHex(name, s, minValue = 0, maxValue = UNICODE_MAX) {
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if (s.match(/^\s*(0[xX])?[\dA-Fa-f]+\s*$/) == null) {
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throw new Error(`invalid ${name} format`);
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}
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const value = parseInt(s, 16);
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if (minValue != null && value < minValue) {
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throw new Error(`${name} must be >= ` + minValue.toString(16).toUpperCase());
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}
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if (maxValue != null && value > maxValue) {
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throw new Error(`${name} must be <= ` + maxValue.toString(16).toUpperCase());
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}
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return value;
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}
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function unihex(code) {
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return ('000' + code.toString(16).toUpperCase()).replace(/0+(?=[\dA-F]{4})/, '');
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}
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function round(value) {
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const esround = Math.round(value);
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return esround - Number(esround % 2 !== 0 && esround - value === 0.5);
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}
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function quote(s) {
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return '"' + s.replace(/"/g, '""') + '"';
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}
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function unquote(s, name) {
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if (s.length >= 2 && s.startsWith('"') && s.endsWith('"')) {
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s = s.substring(1, s.length - 1).replace(/""/g, '"');
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} else if (name != null) {
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throw new Error(name + ' must be quoted');
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}
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return s;
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}
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function message(prefix, severity, text) {
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process.stderr.write(`${prefix}${severity ? severity + ': ' : ''}${text}\n`);
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}
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function warning(prefix, text) {
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message(prefix, 'warning', text);
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}
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function splitWords(name, value, count) {
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const words = value.split(/\s+/, count + 1);
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if (words.length !== count) {
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throw new Error(`${name} must contain ${count} values`);
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}
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return words;
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}
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const GPL2PLUS_LICENSE = ('' +
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'This program is free software; you can redistribute it and/or modify it\n' +
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'under the terms of the GNU General Public License as published by the Free\n' +
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'Software Foundation; either version 2 of the License, or (at your option)\n' +
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'any later version.\n' +
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'\n' +
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'This program is distributed in the hope that it will be useful, but\n' +
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'WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\n' +
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'or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License\n' +
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'for more details.\n' +
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'\n' +
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'You should have received a copy of the GNU General Public License along\n' +
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'with this program; if not, write to the Free Software Foundation, Inc.,\n' +
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'51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n');
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// -- Exports --
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module.exports = Object.freeze({
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UNICODE_MAX,
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UNICODE_BMP_MAX,
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parseDec,
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parseHex,
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unihex,
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round,
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quote,
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unquote,
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message,
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warning,
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splitWords,
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GPL2PLUS_LICENSE
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});
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