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90 lines
1.7 KiB
90 lines
1.7 KiB
/** Make a node */
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function mk (e) {
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return document.createElement(e)
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}
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/** Find one by query */
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function qs (s) {
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return document.querySelector(s)
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}
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/** Find all by query */
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function qsa (s) {
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return document.querySelectorAll(s)
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}
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/** Convert any to bool safely */
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function bool (x) {
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return (x === 1 || x === '1' || x === true || x === 'true')
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}
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/**
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* Filter 'spacebar' and 'return' from keypress handler,
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* and when they're pressed, fire the callback.
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* use $(...).on('keypress', cr(handler))
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*/
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function cr (hdl) {
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return function (e) {
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if (e.which === 10 || e.which === 13 || e.which === 32) {
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hdl()
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}
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}
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}
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/** HTML escape */
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function esc (str) {
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return $.htmlEscape(str)
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}
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/** Check for undefined */
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function undef (x) {
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return typeof x == 'undefined'
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}
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/** Safe json parse */
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function jsp (str) {
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try {
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return JSON.parse(str)
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} catch (e) {
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console.error(e)
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return null
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}
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}
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/** Create a character from ASCII code */
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function Chr (n) {
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return String.fromCharCode(n)
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}
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/** Decode number from 2B encoding */
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function parse2B (s, i = 0) {
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return (s.charCodeAt(i++) - 1) + (s.charCodeAt(i) - 1) * 127
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}
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/** Decode number from 3B encoding */
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function parse3B (s, i = 0) {
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return (s.charCodeAt(i) - 1) + (s.charCodeAt(i + 1) - 1) * 127 + (s.charCodeAt(i + 2) - 1) * 127 * 127
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}
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/** Encode using 2B encoding, returns string. */
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function encode2B (n) {
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let lsb, msb
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lsb = (n % 127)
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n = ((n - lsb) / 127)
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lsb += 1
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msb = (n + 1)
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return Chr(lsb) + Chr(msb)
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}
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/** Encode using 3B encoding, returns string. */
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function encode3B (n) {
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let lsb, msb, xsb
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lsb = (n % 127)
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n = (n - lsb) / 127
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lsb += 1
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msb = (n % 127)
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n = (n - msb) / 127
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msb += 1
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xsb = (n + 1)
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return Chr(lsb) + Chr(msb) + Chr(xsb)
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}
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